CN118843818A - Zoom lens, camera module and electronic equipment - Google Patents

Abstract

A zoom lens (21), a camera module (2), and an electronic device (100), the zoom lens (21) comprising: a first lens group (G1) and a second lens group (G2) arranged from an object side to an image side; the first lens group (G1) has negative optical power, and the second lens group (G2) has positive optical power; the zoom lens (21) has a telephoto end and a wide-angle end, and the first lens group (G1) and the second lens group (G2) are each movable in the optical axis (X) direction to zoom-switch between the telephoto end and the wide-angle end; the critical point number of at least one lens in the zoom lens (21) is more than or equal to 2; the wide-angle end of the zoom lens satisfies the following: 2.5 < TTLw/ImgH < 4: wherein TTLw is the total optical length of the zoom lens (21) at the wide-angle end, and ImgH is the image height. The zoom lens can improve imaging quality when applied to electronic equipment.

Description

Zoom lenses, camera modules and electronic devices

This application claims the priority of the Chinese patent application filed with the China Patent Office on April 25, 2022, with application number 202210441771.9 and application name “Zoom lens, camera module and electronic device”. This application also claims the priority of the Chinese patent application filed with the China Patent Office on April 25, 2022, with application number 202210439560.1 and application name “Zoom lens, camera module and electronic device”. The contents of the above-mentioned prior applications are incorporated into this application by reference.

Technical Field

The present application relates to the field of optical imaging technology, and in particular to a zoom lens, a camera module and an electronic device.

Background Art

With the development of camera technology, people have higher and higher requirements for the imaging quality of cameras. In the related art, in order to achieve wide-angle shooting and telephoto shooting, a main camera lens and a telephoto lens are usually provided respectively for independent shooting. However, this design form will limit the improvement of imaging quality.

Summary of the invention

The present application provides a zoom lens, a camera module and an electronic device. The zoom lens can improve the imaging quality when applied to the electronic device.

In a first aspect, the present application provides a zoom lens, comprising: a first lens group and a second lens group arranged from an object side to an image side; the first lens group has a negative optical focal length, and the second lens group has a positive optical focal length; the zoom lens has a telephoto end and a wide-angle end, and the first lens group and the second lens group can both be moved along the optical axis to switch the zoom between the telephoto end and the wide-angle end; the number of critical points of at least one lens in the zoom lens is greater than or equal to 2; the wide-angle end of the zoom lens satisfies the relationship: 2.5＜TTLw/ImgH＜4; wherein TTLw is the total optical length of the zoom lens when it is at the wide-angle end, and ImgH is the image height.

In a second aspect, the present application provides a zoom lens, comprising: a first lens group and a second lens group arranged from the object side to the image side; the first lens group has a positive optical focal length, and the second lens group has a negative optical focal length; the zoom lens has a telephoto end and a wide-angle end, and the first lens group and the second lens group can both move along the optical axis to switch the zoom between the telephoto end and the wide-angle end; the number of critical points of at least one lens in the zoom lens is greater than or equal to 2; the telephoto end of the zoom lens satisfies the relationship: 1.8＜TTLt/ImgH＜3.6; wherein TTLt is the total optical length of the zoom lens when it is at the telephoto end, and ImgH is the image height.

In a third aspect, the present application further provides a camera module, which includes a photosensitive element and a zoom lens, and the zoom lens can move relative to the photosensitive element along the optical axis.

In a fourth aspect, the present application also provides an electronic device, comprising a device body and a camera module, wherein the device body has an opening, the camera module is arranged in the device body corresponding to the opening, and the zoom lens of the camera module can be at least partially extended out of or retracted into the device body through the opening.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the implementation will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG. 1 is a schematic diagram of an electronic device in a state provided by an embodiment of the present application.

FIG. 2 is a schematic diagram of the electronic device shown in FIG. 1 in another state.

FIG. 3 is a schematic diagram of the electronic device shown in FIG. 2 from another viewing angle.

FIG. 4 is a schematic diagram of a camera module provided in an embodiment of the present application.

FIG. 5 is a schematic diagram of the zoom lens provided in Example 1 of the present application in a collapsed state.

FIG. 6 is a schematic diagram of the zoom lens shown in FIG. 5 at a wide-angle end and a telephoto end.

FIG. 7 is a schematic diagram of a lens with a critical point provided in accordance with an embodiment of the present application.

FIG. 8 is an astigmatism curve of the zoom lens shown in Example 1 when it is at the wide-angle end.

FIG. 9 is an axial chromatic aberration curve when the zoom lens shown in Example 1 is at the wide-angle end.

FIG. 10 is a distortion curve of the zoom lens shown in Example 1 when it is at the wide-angle end.

FIG. 11 is an astigmatism curve of the zoom lens shown in Example 1 when it is at the telephoto end.

FIG. 12 is an axial chromatic aberration curve when the zoom lens shown in Example 1 is at the telephoto end.

FIG. 13 is a distortion curve of the zoom lens shown in Example 1 when it is at the telephoto end.

FIG. 14 is a schematic diagram of the zoom lens provided in Example 2 of the present application in a retracted state.

FIG. 15 is a schematic diagram of the zoom lens shown in FIG. 14 at a wide-angle end and a telephoto end.

FIG. 16 is an astigmatism curve of the zoom lens shown in Example 2 when it is at the wide-angle end.

FIG. 17 is an axial chromatic aberration curve when the zoom lens shown in Example 2 is at the wide-angle end.

FIG. 18 is a distortion curve of the zoom lens shown in Example 2 when it is at the wide-angle end.

FIG. 19 is an astigmatism curve of the zoom lens shown in Example 2 when it is at the telephoto end.

FIG. 20 is an axial chromatic aberration curve when the zoom lens shown in Example 2 is at the telephoto end.

FIG. 21 is a distortion curve of the zoom lens shown in Example 2 when it is at the telephoto end.

FIG. 22 is a schematic diagram of the zoom lens provided in Example 3 of the present application in a retracted state.

FIG. 23 is a schematic diagram of the zoom lens shown in FIG. 22 at the wide-angle end and the telephoto end.

FIG. 24 is an astigmatism curve of the zoom lens shown in Example 3 when it is at the wide-angle end.

FIG. 25 is an axial chromatic aberration curve when the zoom lens shown in Example 3 is at the wide-angle end.

FIG. 26 is a distortion curve of the zoom lens shown in Example 3 when it is at the wide-angle end.

FIG. 27 is an astigmatism curve of the zoom lens shown in Example 3 when it is at the telephoto end.

FIG. 28 is an axial chromatic aberration curve when the zoom lens shown in Example 3 is at the telephoto end.

FIG. 29 is a distortion curve of the zoom lens shown in Example 3 when it is at the telephoto end.

FIG30 is a schematic diagram of the zoom lens provided in Example 4 of the present application in a retracted state.

FIG31 is a schematic diagram of the zoom lens shown in FIG30 at the wide-angle end and the telephoto end.

FIG32 is an astigmatism curve of the zoom lens shown in Example 4 when it is at the wide-angle end.

FIG33 is an axial chromatic aberration curve when the zoom lens shown in Example 4 is at the wide-angle end.

FIG34 is a distortion curve of the zoom lens shown in Example 4 when it is at the wide-angle end.

FIG35 is an astigmatism curve of the zoom lens shown in Example 4 when it is at the telephoto end.

FIG36 is an axial chromatic aberration curve when the zoom lens shown in Example 4 is at the telephoto end.

FIG37 is a distortion curve of the zoom lens shown in Example 4 when it is at the telephoto end.

FIG38 is a schematic diagram of the zoom lens provided in Example 5 of the present application in a retracted state.

FIG39 is a schematic diagram of the zoom lens shown in FIG38 at the wide-angle end and the telephoto end.

FIG40 is an astigmatism curve of the zoom lens shown in Example 5 when it is at the wide-angle end.

FIG41 is an axial chromatic aberration curve when the zoom lens shown in Example 5 is at the wide-angle end.

FIG42 is a distortion curve of the zoom lens shown in Example 5 when it is at the wide-angle end.

FIG43 is an astigmatism curve of the zoom lens shown in Example 5 when it is at the telephoto end.

FIG44 is an axial chromatic aberration curve when the zoom lens shown in Example 5 is at the telephoto end.

FIG45 is a distortion curve of the zoom lens shown in Example 5 when it is at the telephoto end.

Figure 46 is a schematic diagram of the zoom lens provided in Example 6 of the present application in a retracted state.

FIG47 is a schematic diagram of the zoom lens shown in FIG46 at the wide-angle end and the telephoto end.

FIG48 is an astigmatism curve of the zoom lens shown in Example 6 when it is at the wide-angle end.

FIG49 is an axial chromatic aberration curve when the zoom lens shown in Example 6 is at the wide-angle end.

FIG50 is a distortion curve of the zoom lens shown in Example 6 when it is at the wide-angle end.

FIG51 is an astigmatism curve of the zoom lens shown in Example 6 when it is at the telephoto end.

FIG52 is an axial chromatic aberration curve when the zoom lens shown in Example 6 is at the telephoto end.

FIG53 is a distortion curve of the zoom lens shown in Example 6 when it is at the telephoto end.

Figure 54 is a schematic diagram of an electronic device in a certain state provided by an embodiment of the present application.

FIG. 55 is a schematic diagram of the electronic device shown in FIG. 54 in another state.

FIG. 56 is a schematic diagram of the electronic device shown in FIG. 55 from another viewing angle.

Figure 57 is a schematic diagram of the zoom lens provided in Example 1 of the present application in a retracted state.

FIG58 is a schematic diagram of the zoom lens shown in FIG57 at the wide-angle end and the telephoto end.

FIG59 is a schematic diagram of a zoom lens including a third lens group provided in accordance with an embodiment of the present application.

Figure 60 is a schematic diagram of a lens with a critical point provided in an embodiment of the present application.

Figure 61 is a schematic diagram of a zoom lens including a first carrier and a second carrier provided in an embodiment of the present application.

FIG62 is an astigmatism curve of the zoom lens shown in Example 1 when it is at the wide-angle end.

FIG63 is an axial chromatic aberration curve when the zoom lens shown in Example 1 is at the wide-angle end.

FIG64 is a distortion curve of the zoom lens shown in Example 1 when it is at the wide-angle end.

FIG65 is an astigmatism curve of the zoom lens shown in Example 1 when it is at the telephoto end.

FIG66 is an axial chromatic aberration curve when the zoom lens shown in Example 1 is at the telephoto end.

FIG67 is a distortion curve of the zoom lens shown in Example 1 when it is at the telephoto end.

Figure 68 is a schematic diagram of the zoom lens provided in Example 2 of the present application in a retracted state.

FIG69 is a schematic diagram of the zoom lens shown in FIG68 at the wide-angle end and the telephoto end.

FIG70 is an astigmatism curve of the zoom lens shown in Example 2 when it is at the wide-angle end.

FIG71 is an axial chromatic aberration curve when the zoom lens shown in Example 2 is at the wide-angle end.

FIG72 is a distortion curve of the zoom lens shown in Example 2 when it is at the wide-angle end.

FIG73 is an astigmatism curve of the zoom lens shown in Example 2 when it is at the telephoto end.

FIG74 is an axial chromatic aberration curve when the zoom lens shown in Example 2 is at the telephoto end.

FIG75 is a distortion curve of the zoom lens shown in Example 2 when it is at the telephoto end.

Figure 76 is a schematic diagram of the zoom lens provided in Example 3 of the present application in a retracted state.

FIG77 is a schematic diagram of the zoom lens shown in FIG76 at the wide-angle end and the telephoto end.

FIG78 is an astigmatism curve of the zoom lens shown in Example 3 when it is at the wide-angle end.

FIG79 is an axial chromatic aberration curve when the zoom lens shown in Example 3 is at the wide-angle end.

FIG80 is a distortion curve of the zoom lens shown in Example 3 when it is at the wide-angle end.

FIG81 is an astigmatism curve of the zoom lens shown in Example 3 when it is at the telephoto end.

FIG82 is an axial chromatic aberration curve when the zoom lens shown in Example 3 is at the telephoto end.

FIG83 is a distortion curve of the zoom lens shown in Example 3 when it is at the telephoto end.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

Reference to "embodiment" or "implementation" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

The present application provides a zoom lens, which comprises: a first lens group and a second lens group arranged from an object side to an image side; the first lens group has a negative optical power, and the second lens group has a positive optical power; the zoom lens has a telephoto end and a wide-angle end, and both the first lens group and the second lens group can be moved along an optical axis direction to switch zoom between the telephoto end and the wide-angle end; the number of critical points of at least one lens in the zoom lens is greater than or equal to 2; the wide-angle end of the zoom lens satisfies the relationship: 2.5＜TTLw/ImgH＜4; wherein TTLw is the total optical length of the zoom lens when it is at the wide-angle end, and ImgH is the image height.

The zoom lens also has a retracted state, and when the zoom lens is in the retracted state, the relationship is satisfied: cTTL<TTLw and cTTL<TTLt, wherein cTTL is the total optical length of the zoom lens in the retracted state, and TTLt is the total optical length of the zoom lens when it is at the telephoto end.

The retracted state of the zoom lens satisfies the relationship: 1＜cTTL/ImgH＜2.

Wherein, when the zoom lens is switched from the retracted state to the telephoto end, the first lens group and the second lens group move toward the object side along the optical axis.

In the zooming process of the zoom lens from the wide-angle end to the telephoto end, the first lens group moves along the optical axis toward the image side, and the second lens group moves along the optical axis toward the object side.

The zoom lens further includes an aperture, and the aperture is arranged on the object side of the second lens group or inside the second lens group. During the zooming process of the zoom lens, the aperture moves synchronously with the second lens group.

The zoom lens further includes a third lens group having negative optical power, and the third lens group is fixedly arranged on the image side of the second lens group.

Wherein, the total number of lenses in the third lens group is 1-2.

Wherein, the total number of lenses in the first lens group is 2-3; and/or the total number of lenses in the second lens group is 3-5.

The zoom lens satisfies the relationship: 1＜fw/ImgH＜1.7, wherein fw is the focal length at the wide-angle end.

The zoom lens satisfies the relationship: -3＜f1/f2＜-1.2, wherein f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.

The zoom lens satisfies the relationship: 0.05＜Δd/TTLw＜0.25, wherein Δd is the distance that the second lens group moves during the zooming process of the zoom lens from the wide-angle end to the telephoto end.

The zoom lens satisfies the relationship: 1.5<tan(hFOVw)/tan(hFOVt), wherein hFOVw is the half picture angle when the zoom lens is at the wide-angle end, and hFOVt is the half picture angle when the zoom lens is at the telephoto end.

The zoom lens satisfies the relationship ft/ENPt＜3, wherein ft is the focal length at the telephoto end, and ENPt is the entrance pupil diameter when the zoom lens is at the telephoto end.

The lens most on the object side of the first lens group has negative optical power, and/or the lens most on the object side of the second lens group has positive optical power.

The total number of lenses N in the zoom lens satisfies: 5≤N≤10.

The present application provides a zoom lens, which comprises: a first lens group and a second lens group arranged from an object side to an image side; the first lens group has a positive optical power, and the second lens group has a negative optical power; the zoom lens has a telephoto end and a wide-angle end, and both the first lens group and the second lens group can be moved along an optical axis direction to switch zoom between the telephoto end and the wide-angle end; the number of critical points of at least one lens in the zoom lens is greater than or equal to 2; the telephoto end of the zoom lens satisfies the relationship: 1.8＜TTLt/ImgH＜3.6; wherein TTLt is the total optical length of the zoom lens when it is at the telephoto end, and ImgH is the image height.

The zoom lens also has a retracted state, and when the zoom lens is in the retracted state, the relationship is satisfied: cTTL<TTLw and cTTL<TTLt, wherein cTTL is the total optical length of the zoom lens in the retracted state, and TTLw is the total optical length of the zoom lens at the wide-angle end.

The retracted state of the zoom lens satisfies the relationship: 1＜cTTL/ImgH＜2.

Wherein, when the zoom lens is switched from the contracted state to the wide-angle end, the first lens group moves toward the object side along the optical axis.

In the zooming process of the zoom lens from the wide-angle end to the telephoto end, the first lens group moves along the optical axis toward the object side, and the second lens group moves along the optical axis toward the object side.

The zoom lens further includes a diaphragm, which is disposed on the object side of the first lens group, inside the first lens group, or on the image side of the first lens group. During the zooming process of the zoom lens, the diaphragm moves along with the first lens group.

Wherein, the zoom lens further includes a third lens group, and the third lens group is fixedly arranged on the image side of the second lens group.

Wherein, the total number of lenses in the third lens group is 1-2.

Wherein, the total number of lenses in the first lens group is 3-5; and/or the total number of lenses in the second lens group is 2-4.

The zoom lens satisfies the relationship: 1＜fw/ImgH＜1.7, wherein fw is the focal length at the wide-angle end.

The zoom lens satisfies the relationship: -1＜f1/f2＜-0.5, wherein f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.

The zoom lens satisfies the relationship: 0.15＜Δd/TTLt＜0.5, wherein Δd is the distance that the first lens group moves during the zooming process of the zoom lens from the wide-angle end to the telephoto end.

The zoom lens satisfies the relationship: 1.5<tan(hFOVw)/tan(hFOVt), wherein hFOVw is the half picture angle when the zoom lens is at the wide-angle end, and hFOVt is the half picture angle when the zoom lens is at the telephoto end.

The zoom lens satisfies the relationship: fw/ENPw＜2.4, wherein fw is the focal length at the wide-angle end, and ENPw is the entrance pupil diameter when the zoom lens is at the wide-angle end.

Wherein, the lens on the most image side of the first lens group has positive optical power.

The total number of lenses N in the zoom lens satisfies: 5≤N≤10.

The present application also provides a camera module, which includes a photosensitive element and a zoom lens, and the zoom lens can move relative to the photosensitive element along the optical axis.

The present application also provides an electronic device, which includes a device body and a camera module. The device body has an opening, and the camera module is arranged in the device body corresponding to the opening. The zoom lens of the camera module can at least partially extend out of or retract into the device body through the opening.

The following is divided into the first part and the second part to introduce two different zoom lenses, camera modules and electronic devices provided by this application. Among them, the first part comes from the prior application with application number 202210441771.9, and the second part comes from the prior application with application number 202210439560.1.

Part 1 (corresponding to FIGS. 1 to 53)

Please refer to Figures 1 to 3. The present application provides an electronic device 100, which includes a device body 1 and a camera module 2. The device body 1 has an opening K14, and the camera module 2 is arranged in the device body 1 corresponding to the opening K14. The zoom lens 21 of the camera module 2 can at least partially extend or retract into the device body 1 through the opening K14. When the user needs to take pictures, the zoom lens 21 can be controlled to extend out of the device body 1 through the opening K14 (as shown in Figure 2). When the user does not need to take pictures, the zoom lens 21 can be controlled to retract into the device body 1 through the opening K14 (as shown in Figure 1).

The electronic device 100 may be a mobile phone, a tablet computer, a laptop computer, a wearable device (such as a smart watch, a bracelet, a VR device, etc.), a television, an e-reader, or the like.

The device body 1 refers to the main part of the electronic device 100, which includes electronic components that realize the main functions of the electronic device 100 and a housing that protects and carries these electronic components. The device body 1 may include a display screen 11, a middle frame 12, and a back cover 13 (as shown in FIG. 3 ). The display screen 11 and the back cover 13 are both connected to the middle frame 12 and are arranged on opposite sides of the middle frame 12, and the side of the middle frame 12 is exposed outside the back cover 13 and the display screen 11.

It should be noted that, according to actual needs, the camera module 2 can be set on any side of the electronic device 100, and this application does not limit this. Taking a mobile phone as an example, the camera module 2 can be set on the front, back, and side of the mobile phone. Among them, the so-called front refers to the side of the mobile phone with a display screen 11; the so-called back refers to the side of the mobile phone with a back cover 13; the so-called side refers to the circumferential side of the middle frame 12 of the mobile phone. It can be understood that the definition of the front, back, side, etc. of the electronic device 100 may be different for different types, and other types of electronic devices 100 are not described in detail here.

Furthermore, the opening K14 may be provided on the back cover 13. In other embodiments, the opening K14 may also be provided on the display screen 11; or, the opening K14 is provided on the middle frame 12. When the back cover 13 has the opening K14, the camera module 2 is a rear camera. When the display screen 11 has the opening K14, the camera module is a front camera. It is understandable that the introduction of the device body 1 in this embodiment is merely an introduction to an application scenario of the camera module 2, and should not be understood as a limitation on the electronic device 100 provided in this application.

In the related art, as people pursue higher and higher image quality of electronic devices with shooting functions, such as high image quality and high pixels, it is usually necessary to design the photosensitive element and lens in the camera module. For example, a photosensitive element with a large bottom is used. Since the distance between the photosensitive element and the lens is not adjustable, it is necessary to design the distance between the lens and the photosensitive element to be longer. When the field of view (FOV) is basically unchanged, the distance between the lens and the photosensitive element is longer, which means that the total length of the camera module will also be longer. When the camera module is applied to electronic devices, the result is that the electronic device body will become thicker and thicker, which is not conducive to the thinning of electronic devices. In other words, for thin electronic devices, the length of the camera module will also be limited due to the thickness limit of the electronic device. When the thickness of the camera module is limited, since the distance between the photosensitive element and the lens is not adjustable, the distance between the lens and the photosensitive element in the camera lens module will be limited. If the thickness of the camera lens module is designed to be thicker and the thickness of the electronic device is thinner, the camera module may form a thicker protrusion on the back cover of the electronic device. Therefore, when the camera module in the related art is applied to electronic devices, it is impossible to achieve the compatibility between the thinness of the electronic devices and the high imaging quality of the camera module.

In the electronic device 100 provided in the embodiment of the present application, since the zoom lens 21 can be extended or retracted into the device body 1 through the opening K14, the camera module 2 can have a larger focal length without affecting the thickness of the electronic device 100, thereby solving the incompatibility problem between the thinness of the electronic device 100 and the high imaging quality of the camera module 2.

Please refer to Figure 4. The present application also provides a camera module 2, which includes a filter 22, a photosensitive element 23 and a zoom lens 21 described in any of the following embodiments. The zoom lens 21, the filter 22, and the photosensitive element 23 are arranged in sequence along the optical axis X. When shooting, the external light passes through the zoom lens 21, the filter 22 in sequence, and finally reaches the photosensitive element 23. The first lens group G1 and the second lens group G2 of the zoom lens 21 can move relative to the photosensitive element 23 along the optical axis X. It should be noted that the structure shown in Figure 4 is only an exemplary description and should not be regarded as a limitation of the present application.

The zoom lens 21 is used to collect light from the scene being photographed and focus the light on the photosensitive element 23. The filter 22 is used to eliminate unnecessary light to improve the effective resolution and color reproduction. The filter 22 can be, but is not limited to, an infrared filter 22. The photosensitive element 23 (Sensor) is also called a photosensitive chip or an image sensor, which is used to receive the light passing through the filter 22 and convert the light signal into an electrical signal. The photosensitive element 23 can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The photosensitive element 23 has an imaging surface S231, and the imaging surface S231 is a target surface on the photosensitive element 23 that receives light.

It should be noted that the imaging surface S231 and the filter 22 involved in the following embodiments of the zoom lens 21 are used to assist in describing the positions of the first lens group G1 and the second lens group G2, and do not mean that the zoom lens 21 includes a photosensitive element 23 with an imaging surface S231 and a filter 22.

The zoom lens 21 in the camera module 2 is described in detail below with reference to the accompanying drawings.

Please refer to FIG. 5 , the present application also provides a zoom lens 21, which includes: a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The object side and the image side refer to: the side where the object is located is the object side, and the side where the image of the object is located is the image side, with the zoom lens 21 as the boundary. Therefore, when shooting, the light first passes through the first lens group G1 closer to the object side, and then passes through the second lens group G2 closer to the image side.

The first lens group G1 has negative focal power, and the second lens group G2 has positive focal power. The focal power characterizes the ability of an optical system (lens or lens group) to deflect light. Generally speaking, the focal power is also the reciprocal of the image focal length. A positive focal power of an optical system indicates that it has a converging effect on light. A negative focal power of an optical system indicates that it has a diverging effect on light.

The first lens group G1 and the second lens group G2 are both used to achieve zooming by moving, and thus both can be referred to as zoom lens groups.

Either the first lens group G1 or the second lens group G2 is a compensation lens group. That is, the first lens group G1 is a compensation lens group, or the second lens group G2 is a compensation lens group. The so-called compensation lens group refers to a lens group used to compensate the image plane position so that the focus of the object at different distances falls on the imaging plane S231.

Optionally, the lens on the most object side of the first lens group G1 has negative optical power, so that the zoom lens 21 can provide a better imaging effect.

Optionally, the lens on the most object side of the second lens group G2 has positive refractive power, so that the zoom lens 21 can provide better imaging effect.

The most object-side lens of the first lens group G1 refers to the lens closest to the object side in the first lens group G1. Similarly, the most object-side lens of the second lens group G2 refers to the lens closest to the object side in the second lens group G2.

Please refer to FIG. 6 , the zoom lens 21 has a telephoto end and a wide-angle end. The first lens group G1 and the second lens group G2 can both move along the optical axis X direction to switch zoom between the telephoto end and the wide-angle end. The telephoto end refers to the state when the focal length of the zoom lens 21 is the largest, and the telephoto end can also be called the telephoto state. The wide-angle end refers to the state when the focal length of the zoom lens 21 is the smallest, and the wide-angle end can also be called the wide-angle state. When the zoom lens 21 is at the telephoto end, the positions of the first lens group G1 and the second lens group G2 are different from the positions of the first lens group G1 and the second lens group G2 when the zoom lens 21 is at the wide-angle end. Therefore, the telephoto end and the wide-angle end are two different shooting states of the zoom lens 21, wherein the telephoto end is used for telephoto shooting, and the wide-angle end is used for wide-angle shooting.

In the related technology, the mobile phone is equipped with at least three lenses, including a telephoto lens, a main camera lens, and an ultra-wide-angle lens. Among them, the telephoto lens is used for telephoto shooting, and the main camera and the ultra-wide-angle lens are both used for wide-angle shooting, and the field of view of the main camera is smaller than that of the ultra-wide-angle lens. However, this design will first lead to a larger volume of the entire camera module and increase product costs. In addition, since the lenses for different purposes are set separately, each lens can only be used with a small-bottom photosensitive element, which affects the image quality.

In the zoom lens 21 provided in the embodiment of the present application, since both the first lens group G1 and the second lens group G2 can be moved along the optical axis X direction, the zoom lens 21 can be switched between the telephoto end and the wide-angle end by moving the first lens group G1 and the second lens group G2. Compared with the related art, the zoom lens 21 provided in the present embodiment is equivalent to integrating the telephoto lens and the main camera lens, thereby reducing the module volume and reducing the cost, and can be matched with a large-bottom photosensitive element 23 (for example, a 1/1.28-inch photosensitive element 23) to achieve 50 million pixel imaging from the wide-angle end to the telephoto end, thereby improving the imaging quality (for example, achieving high-pixel shooting and reducing the signal-to-noise ratio).

Optionally, the wide-angle end of the zoom lens 21 satisfies the relationship: 2.5＜TTLw/ImgH＜4. Wherein, TTLw is the total optical length of the zoom lens 21 when it is at the wide-angle end, and ImgH is the image height, which refers to half of the diagonal length of the effective pixel area of the imaging surface S231. It should be noted that the total optical length refers to the distance from the surface of the first lens group G1 closest to the object side to the imaging surface S231. Please refer to this for the following description of the total optical length.

The TTLw/ImgH may be, but is not limited to, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, etc. For example, TTLw is 20 mm and ImgH is 6.450 mm; or TTLt is 23.378 mm and ImgH is 6.450 mm; or TTLt is 23.5 mm and ImgH is 6.450 mm.

Since the zoom lens 21 satisfies the above relationship, the zoom lens 21 can not only be miniaturized, but also effectively maintain good optical performance. It can be understood that the miniaturized zoom lens 21 is more suitable for electronic devices 100 that require lightness and thinness, such as mobile phones.

In the related art, zoomable camera modules have been applied to electronic devices with thin and light requirements such as mobile phones. Specifically, since the zoom function requires that the lens in the camera module can move relative to the photosensitive element, the total length of the camera module must be long, generally greater than the thickness of the electronic device. In order to avoid the electronic device being too thick, a periscope camera is usually used, and the length direction of the periscope camera is arranged in accordance with the width direction (or length direction) of the electronic device, that is, the length direction of the periscope camera is arranged perpendicular to the thickness direction of the electronic device. A prism is provided in the periscope camera, which is used to receive and reflect external light so that the reflected light propagates along the length direction of the periscope camera. However, the periscope camera is suitable for telephoto shooting, but not for wide-angle shooting, because wide-angle shooting requires the camera to have a large field of view. As the field of view increases, the thickness of the prism will also increase, and thus cannot meet the thickness of the electronic device. Moreover, specifications such as aperture and peripheral brightness will also be limited by the thickness of the prism.

In the present application, when the zoom lens 21 is applied to the electronic device 100, the zoom lens 21 can be extended or retracted through the opening K14 on the device body 1, so that the first lens group G1 and the second lens group G2 move relative to the photosensitive element 23, thereby achieving zooming. In this structural form, no prism is involved, so the technical problems caused by the above prism will not occur. Therefore, the zoom lens 21 provided in the present application can improve the imaging quality.

Please refer to FIG. 5 . The zoom lens 21 also has a retracted state. When the zoom lens 21 is in the retracted state, the relationship is satisfied: cTTL<TTLw and cTTL<TTLt. Wherein, cTTL is the total optical length of the zoom lens 21 when it is in the retracted state, and TTLt is the total optical length of the zoom lens 21 when it is at the telephoto end. In other words, among the above three states, the total optical length cTTL when the zoom lens 21 is in the retracted state is the shortest, which is smaller than the total optical lengths corresponding to the telephoto end and the wide-angle end. Therefore, cTTL is the minimum total optical length of the zoom lens 21. Therefore, when the user needs to shoot, the zoom lens 21 can be controlled to extend to switch to the wide-angle end or the telephoto end. When shooting is not required, the zoom lens 21 can be controlled to shorten to switch to the retracted state. In conjunction with the electronic device 100 provided in the previous embodiment, when the zoom lens 21 is extended to switch to the wide-angle end or the telephoto end, it extends out of the electronic device 100 through the opening K14; when the zoom lens 21 is shortened to switch to the retracted state, the zoom lens 21 is retracted into the electronic device 100.

Furthermore, the zoom lens 21 satisfies: cTTL<TTLt<TTLw. That is, when the zoom lens 21 is at the wide-angle end, the total optical length TTLw is greater than when the zoom lens 21 is at the telephoto end, and thus TTLw is the maximum total optical length of the zoom lens 21.

From the perspective of zooming, when the zoom lens 21 switches from the collapsed state to the telephoto end, the first lens group G1 and the second lens group G2 move along the optical axis toward the object side (see FIGS. 5 and 6 ). When the zoom lens 21 switches from the wide-angle end to the telephoto end, the first lens group G1 moves along the optical axis toward the image side, and the second lens group G2 moves along the optical axis toward the object side (see FIG. 6 ).

Optionally, the retracted state of the zoom lens satisfies the relationship: 1<cTTL/ImgH<2. Wherein, cTTL is the total optical length of the zoom lens 21 when it is in the retracted state, and ImgH is the image height.

Among them, cTTL/ImgH can be but not limited to 1.1, 1.2, 1.24, 1.3, 1.4, 1.5, 1.55, 1.6, 1.7, 1.8, 1.9, etc. For example, cTTL is 10.5mm and ImgH is 6.45mm; or cTTL is 9.97mm and ImgH is 6.45mm; or cTTL is 9.98mm and ImgH is 6.45mm.

From the above data, it can be seen that when the value of ImgH is 6.45 mm, the maximum optical total length TTLw of the zoom lens 21 is about 20 mm, and the minimum optical total length cTTL is about 10 mm. Therefore, the zoom lens 21 provided in the present application can be applied to electronic devices 100 with thin and light requirements, such as mobile phones. This allows the zoom lens 21 to be not only miniaturized, but also effectively maintain good optical performance.

Optionally, when the zoom lens 21 is in a retracted state, both the first lens group G1 and the second lens group G2 are located inside the device body 1 .

Optionally, when the zoom lens 21 is at the wide-angle end and the telephoto end, the first lens group G1 is at least partially located outside the device body 1, and the second lens group G2 is at least partially located outside the device body.

Please refer to FIG. 6 , the zoom lens further includes an aperture 211, and the aperture 211 is arranged on the object side of the second lens group G2 or inside the second lens group G2. That is, the aperture 211 can be arranged outside the second lens group G2, or between two adjacent lenses in the second lens group G2. During the zooming process of the zoom lens, the aperture 211 and the second lens group G2 move synchronously. That is, the aperture 211 and the second lens group G2 are relatively fixed, and the so-called relative fixation means that the aperture 211 and the second lens group G2 move together. The aperture 211 can be fixed on the second lens group G2, or on other components, which is not limited here. Since the arrangement between the lenses in the second lens group G2 is relatively sparse, and the arrangement between the lenses in the first lens group G1 is relatively close, therefore, setting the aperture 211 together with the second lens group G2 can reasonably utilize the space, and the radial size of each lens in the second lens group G2 is small, so the aperture 211 is easier to be set together with the second lens group G2.

Optionally, please refer to Figures 5 and 6, the zoom lens 21 also includes a third lens group G3 with negative optical power, and the third lens group G3 is fixedly arranged on the image side of the second lens group G2. The third lens group G3 is used to correct the chief ray incident angle (Chief Ray Angle, CRA) at the wide-angle end and the telephoto end. CRA is a parameter of the sensor, and the light needs to be incident on the sensor at the required angle. For the zoom lens 21, the CRA at the wide-angle end and the telephoto end needs to be consistent. Therefore, the setting of the third lens group G3 can ensure that the zoom lens 21 has good imaging quality.

Optionally, the total number of lenses in the first lens group is 2-3, that is, it can be 2 or 3.

Optionally, the total number of lenses in the second lens group is 3-5, that is, it can be 3, 4 or 5.

Optionally, when the zoom lens 21 includes a third lens group G3, the total number of lenses in the third lens group is 1-2, that is, it can be 1 or 2.

It should be noted that, for a lens, each lens in the first lens group G1, the second lens group G2, and the third lens group G3 can be a glass lens or a plastic lens. Each lens can have a positive optical power or a negative optical power. Furthermore, the surface of the lens close to the object side is called the object side surface, and the surface of the lens close to the image side is called the image side surface. The object side surface of each lens in the above three lens groups can be a spherical surface, an aspherical surface, etc., and similarly, the image side surface of each lens can be a spherical surface, an aspherical surface, etc.

Optionally, referring to FIG. 7 , the number of critical points Q of at least one lens in the zoom lens 21 is greater than or equal to 2. In other words, the zoom lens 21 includes at least one lens having 2 critical points Q or more. The critical point Q refers to a point of tangency on the lens surface that is tangent to a tangent plane perpendicular to the optical axis X, except for the intersection with the optical axis X. When a lens has 2 or more critical points Q, the shape change of the lens in the radial direction will be relatively gentle, thereby avoiding the thickness of the lens being too large, thereby reducing the space occupied by the lens in the direction from the object side to the image side, so as to miniaturize the zoom lens 21, which is more conducive to application in electronic devices 100 with thin and light requirements.

Optionally, referring to FIG. 4 , the zoom lens 21 further includes a first carrier 212 and a second carrier 213. The first carrier 212 may be sleeved on the outer periphery of the second carrier 213. The first carrier 212 and the second carrier 213 may both move relative to each other along the optical axis X direction. The first lens group G1 is fixed in the first carrier 212. The first carrier 212 is used to drive the first lens group G1 to move relative to the photosensitive element 23 along the optical axis X. The second lens group G2 is fixed in the second carrier 213. The second carrier 213 is used to drive the second lens group G2 to move relative to the photosensitive element 23 along the optical axis X. The first carrier 212 may be disposed in the opening K14 of the electronic device 100, and the first carrier 212 and the second carrier 213 may extend or retract into the electronic device 100 through the opening K14. Of course, the bearing form of the first lens group G1 and the second lens group G2 may also be other forms, and the structure shown in FIG. 4 is only an exemplary description and should not be regarded as a limitation of the present application.

Optionally, the zoom lens 21 satisfies the relationship: 1＜fw/ImgH＜1.7, wherein fw is the focal length at the wide-angle end.

fw/ImgH can be, but is not limited to, 1.1, 1.2, 1.3, 1.32, 1.4, 1.5, 1.6, etc. For example, fw is 7 mm and ImgH is 6.45 mm; or fw is 8.5 mm and ImgH is 6.45 mm; or fw is 8.6 mm and ImgH is 6.45 mm.

In this embodiment, the ratio of the focal length fw at the wide-angle end to the image height ImgH is set to be greater than 1 and less than 1.7, thereby ensuring that the focal length at the wide-angle end is within the commonly used focal length range of the main camera of the mobile phone.

Optionally, the zoom lens 21 satisfies the relationship: -3＜f1/f2＜-1.2, wherein f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.

f1/f2 can be, but is not limited to, -2.9, -2.8, -2.7, -2.6, -2.5, -2.4, -2.3, -2.2, -2.1, -2, -1.9, -1.8, -1.7, -1.6, -1.5, -1.4, -1.3, etc. For example, f1 is -17.615mm and f2 is 8.495mm; or f1 is -13.251mm and f2 is 7.026mm; or f1 is -18.621mm and f2 is 8.523mm.

In this embodiment, the ratio of the focal length f1 of the first lens group G1 to the focal length f2 of the second lens group G2 is set to be greater than -3 and less than -1.2, so that the optical power relationship between the first lens group G1 and the second lens group G2 can be reasonably distributed to better achieve focusing and zooming.

Optionally, the zoom lens 21 satisfies the relationship: 0.05＜Δd/TTLw＜0.25, wherein Δd is the distance that the second lens group G2 moves during the zooming process of the zoom lens 21 from the wide-angle end to the telephoto end.

Δd/TTLw can be, but is not limited to, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, etc. For example, Δd is 1.705 mm and TTLw is 20 mm; or Δd is 1.787 mm and TTLw is 23.378 mm; or Δd is 1.831 mm and TTLw is 23.5 mm.

In this embodiment, the ratio of the moving distance of the second lens group G2 from the wide-angle end to the telephoto end to the maximum optical total length TTLw of the zoom lens 21 is reasonably set between 0.05 and 0.25, so that a larger magnification ratio can be achieved with a smaller change in the lens group interval, which is beneficial to compressing the total length of the zoom lens 21.

Optionally, the zoom lens 21 satisfies the relationship: 1.5<tan(hFOVw)/tan(hFOVt), wherein hFOVw is the half picture angle when the zoom lens 21 is at the wide-angle end, and hFOVt is the half picture angle when the zoom lens 21 is at the telephoto end. The half picture angle refers to half of the field of view (FOV).

Tan(hFOVw)/tan(hFOVt) may be, but is not limited to, 1.6, 1.71, 1.8, 1.9, 2.0, 2.1, 2.2, 2.25, etc. For example, hFOVw is 52.806° and hFOVt is 32.913°; or hFOVw is 43.738° and hFOVt is 26.812°; or hFOVw is 43.935° and hFOVt is 26.855°.

In this embodiment, the ratio of tan(hFOVw) to tan(hFOVt) is set to be greater than 1.5, so that the zoom ratio of the zoom lens 21 is greater than 1.5 times.

Optionally, the zoom lens 21 satisfies the relationship ft/ENPt＜3, wherein ft is the focal length at the telephoto end, and ENPt is the entrance pupil diameter when the zoom lens 21 is at the telephoto end.

ft/ENPt can be, but is not limited to, 2.9, 2.8, 2.7, 2.6, 2.5, 2.4, 2.3, 2.2, 2.1, 2, 1.9, 1.8, 1.7, 1.6, 1.5, etc. For example, ft is 10.3 mm and ENPt is 4.256 mm; or ft is 12.5 mm and ENPt is 5.208 mm; or ft is 12.5 mm and ENPt is 5.208 mm.

In this embodiment, by setting the ratio of the telephoto focal length to the entrance pupil diameter to be less than 3, the aperture at the telephoto end is set to be less than 3, thereby improving the brightness and blur effect of the lens. The higher the brightness of the lens, the more light enters the lens, which means that clear imaging can be achieved at night.

Optionally, for any of the above embodiments, the total number of lenses N in the zoom lens 21 satisfies: 5≤N≤10. The total number of lenses N may be 5, 6, 7, 8, 9, or 10. For example, the total number of lenses in the first lens group G1 is 2, the total number of lenses in the second lens group G2 is 4, and the total number of lenses in the third lens group G3 is 0. Alternatively, the total number of lenses in the first lens group G1 is 2, the total number of lenses in the second lens group G2 is 4, and the total number of lenses in the third lens group G3 is 2.

The more lenses there are in the zoom lens, the better the imaging effect of the zoom lens 21. When the fewer lenses there are in the zoom lens, the lower the cost is and the smaller the minimum total optical length cTTL is. When the total number of lenses N is less than 5, the imaging quality cannot be guaranteed; when the total number of lenses N is greater than 10, the total optical length of the zoom lens 21 is too large and is not suitable for application in electronic devices 100 with thin and light requirements. The embodiment of the present application takes into account both imaging quality and total optical length and selects the total number of lenses to be between 5 and 10, thereby ensuring that the zoom lens 21 has a good imaging effect while achieving the beneficial effect of miniaturization of the zoom lens 21.

By using the zoom lens 21 provided in the present application, the maximum optical total length TTLw of the zoom lens 21 can be controlled below 26 mm (for example, 20 mm). The minimum optical total length cTTL of the zoom lens 21 can be controlled below 11 mm (for example, 10 mm). The field of view at the wide-angle end can be achieved below 90 degrees (for example, 85 degrees). The field of view at the telephoto end can be achieved less than 52 degrees. Therefore, the zoom lens 21 provided in the present application can not only be well adapted to electronic devices 100 with requirements for lightness and thinness, but also have good shooting performance.

The zoom lens 21 provided by the present application is further described below through three groups of specific embodiments. In the following embodiments, the calculation formulas for each aspherical surface are:

Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the reciprocal of the curvature radius R in the following table); k is the cone coefficient (see the table); Ai is the i-th order aspheric coefficient.

Example 1

Please refer to FIG. 5 and FIG. 6, wherein FIG. 6(a) is a schematic diagram of the zoom lens shown in FIG. 5 at the wide-angle end. FIG. 6(b) is a schematic diagram of the zoom lens shown in FIG. 5 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from the object side to the image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged from the object side to the image side. The third lens group G3 includes a seventh lens L7. The zoom lens 21 also includes an aperture 211, and the aperture 211 is arranged between the second lens L2 and the third lens L3.

For specific data of the zoom lens provided in Example 1, please refer to Tables 1 to 5.

Table 1 shows the parameters of the lenses, apertures, and filters of the zoom lens in Example 1, including the radius of curvature R, the interval d, the refractive index Nd, and the Abbe coefficient Vd. The units of the radius of curvature R and the interval d are both millimeters (mm). In Table 1, surface numbers 1-19 are the surfaces of the object, the lenses, apertures, and filters, and the imaging surface, which are marked in sequence from the object side to the image side. The object is recorded as OBJ, the aperture is recorded as STO, and the imaging surface is recorded as IMA.

It should be noted that the interval d represents the interval distance d between the current surface and the next surface along the optical axis. For example, the interval between surface 2 and surface 3 in Table 1 is 0.6, and the interval between surface 3 and surface 4 is 1.261. Please refer to the explanation here for the interval d mentioned later.

Table 2 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 1, that is, the variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 3 shows the k value and aspheric coefficient of the aspheric mirror surface of each lens in Example 1. Table 3 includes Table 3a, Table 3b, Table 3c, and Table 3d.

Table 4 shows the overall parameter data of the zoom lens in Example 1.

Table 5 shows the conditional expressions and corresponding data of the zoom lens in Example 1. In the following table, N is the number of lenses.

In this embodiment, the zoom lens 21 group is switched among the telephoto end, the wide-angle end, and the collapsed state by changing the interval d1 along the optical axis X between the first lens group G1 and the aperture 211 (i.e., the interval distance between the image side surface of the second lens L2 and the aperture 211 along the optical axis X), and the interval d2 along the optical axis X between the second lens group G2 and the third lens group G3 (i.e., the interval distance between the image side surface of the sixth lens L6 and the object side surface of the seventh lens L7 along the optical axis X).

Please refer to FIG. 8 to FIG. 10 , which are related curve diagrams of the wide-angle end of the zoom lens.

Fig. 8 is an astigmatism curve of the zoom lens at the wide angle end in Example 1. In the figure, the dotted line represents the meridian, and the solid line represents the sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 9 is an axial chromatic aberration curve when the zoom lens is at the wide-angle end in Example 1. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

Fig. 10 is a distortion curve of the zoom lens at the wide-angle end in Example 1. The corresponding light wavelength in the figure is 587.6 nm.

Please refer to FIG. 11 to FIG. 13 , which are related curve diagrams of the telephoto end of the zoom lens.

Fig. 11 is an astigmatism curve when the zoom lens is at the telephoto end in Example 1. In the figure, the dotted line represents the meridian, and the solid line represents the sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 12 is an axial chromatic aberration curve when the zoom lens is at the telephoto end in Example 1. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

Fig. 13 is a distortion curve when the zoom lens is at the telephoto end in Example 1. The corresponding light wavelength in the figure is 587.6nm.

It can be seen from FIG. 8 to FIG. 13 that the zoom lens provided in Example 1 has good imaging quality at both the wide-angle end and the telephoto end.

Example 2

Please refer to FIG. 14 and FIG. 15, wherein FIG. 15(a) is a schematic diagram of the zoom lens shown in FIG. 14 at the wide-angle end. FIG. 15(b) is a schematic diagram of the zoom lens shown in FIG. 14 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from the object side to the image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged from the object side to the image side. The third lens group G3 includes a seventh lens L7. The zoom lens 21 also includes an aperture 211, and the aperture 211 is arranged between the second lens L2 and the third lens L3.

For specific data of the zoom lens provided in Example 2, please refer to Tables 6 to 10.

Table 6 shows the parameters of the lenses, apertures, and filters of the zoom lens in Example 2, including the radius of curvature R, the interval d, the refractive index Nd, and the Abbe coefficient Vd. The units of the radius of curvature R and the interval d are both millimeters (mm). In Table 6, surface numbers 1-19 are the surfaces of the object, the lenses, apertures, and filters, and the imaging surface, which are marked in sequence from the object side to the image side. The object is recorded as OBJ, the aperture is recorded as STO, and the imaging surface is recorded as IMA.

Table 7 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 2, that is, the variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 8 shows the k value and aspheric coefficient of the aspheric mirror surface of each lens in Example 2. Table 8 includes Table 8a, Table 8b, Table 8c, and Table 8d.

Table 9 shows the overall parameter data of the zoom lens in Example 2.

Table 10 shows the conditional expressions and corresponding data of the zoom lens in Example 2. In the following table, N is the number of lenses.

In this embodiment, the zoom lens 21 group is switched among the telephoto end, the wide-angle end, and the collapsed state by changing the interval d1 along the optical axis X between the first lens group G1 and the aperture 211 (i.e., the interval distance between the image side surface of the second lens L2 and the aperture 211 along the optical axis X), and the interval d2 along the optical axis X between the second lens group G2 and the third lens group G3 (i.e., the interval distance between the image side surface of the sixth lens L6 and the object side surface of the seventh lens L7 along the optical axis X).

Please refer to FIG. 16 to FIG. 18 , which show relevant curve diagrams at the wide-angle end of the zoom lens.

FIG16 is an astigmatism curve of the zoom lens at the wide angle end in Example 2. In the figure, the dotted line represents the meridian, the solid line represents the sagittal, and the corresponding light wavelength is 587.6 nm.

Fig. 17 is an axial chromatic aberration curve when the zoom lens is at the wide-angle end in Example 2. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG18 is a distortion curve of the zoom lens at the wide-angle end in Example 2. The corresponding light wavelength in the figure is 587.6 nm.

Please refer to FIG. 19 to FIG. 21 , which are related curve diagrams of the telephoto end of the zoom lens.

FIG19 is an astigmatism curve when the zoom lens is at the telephoto end in Example 2. In the figure, the dotted line represents the meridian, and the solid line represents the sagittal, and the corresponding light wavelength is 587.6 nm.

Fig. 20 is an axial chromatic aberration curve when the zoom lens is at the telephoto end in Example 2. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG21 is a distortion curve of the zoom lens at the telephoto end in Example 2. The corresponding light wavelength in the figure is 587.6 nm.

It can be seen from FIG. 16 to FIG. 21 that the zoom lens provided in Example 2 has good imaging quality at both the wide-angle end and the telephoto end.

Example 3

Please refer to FIG. 22 and FIG. 23, wherein FIG. 23(a) is a schematic diagram of the zoom lens shown in FIG. 22 at the wide-angle end. FIG. 23(b) is a schematic diagram of the zoom lens shown in FIG. 22 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from the object side to the image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged from the object side to the image side. The third lens group G3 includes a seventh lens L7. The zoom lens 21 also includes an aperture 211, and the aperture 211 is arranged between the second lens L2 and the third lens L3.

For specific data of the zoom lens provided in Example 3, please refer to Tables 11 to 15.

Table 11 shows the parameters of the lenses, apertures, and filters of the zoom lens in Example 3, including the radius of curvature R, the interval d, the refractive index Nd, and the Abbe coefficient Vd. The units of the radius of curvature R and the interval d are both millimeters (mm). In Table 11, surface numbers 1-19 are the surfaces of the object, the lenses, apertures, and filters, and the imaging surface, which are marked in sequence from the object side to the image side. The object is recorded as OBJ, the aperture is recorded as STO, and the imaging surface is recorded as IMA.

Table 12 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 3, that is, the variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 13 shows the k value and aspheric coefficient of the aspheric mirror surface of each lens in Example 3. Table 13 includes Table 13a, Table 13b, Table 13c, and Table 13d.

Table 14 shows the overall parameter data of the zoom lens in Example 3.

Table 15 shows the conditional expressions and corresponding data of the zoom lens in Example 3. In the following table, N is the number of lenses.

In this embodiment, the zoom lens 21 group is switched among the telephoto end, the wide-angle end, and the collapsed state by changing the interval d1 along the optical axis X between the first lens group G1 and the aperture 211 (i.e., the interval distance between the image side surface of the second lens L2 and the aperture 211 along the optical axis X), and the interval d2 along the optical axis X between the second lens group G2 and the third lens group G3 (i.e., the interval distance between the image side surface of the sixth lens L6 and the object side surface of the seventh lens L7 along the optical axis X).

Please refer to FIG. 24 to FIG. 26 , which show relevant curve diagrams of the wide-angle end of the zoom lens.

FIG24 is an astigmatism curve of the zoom lens at the wide angle end in Example 3. In the figure, the dotted line represents the meridian, the solid line represents the sagittal, and the corresponding light wavelength is 587.6 nm.

Fig. 25 is an axial chromatic aberration curve when the zoom lens is at the wide-angle end in Example 3. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG26 is a distortion curve of the zoom lens at the wide-angle end in Example 3. The corresponding light wavelength in the figure is 587.6 nm.

Please refer to FIG. 27 to FIG. 29 , which show relevant curve diagrams of the telephoto end of the zoom lens.

FIG27 is an astigmatism curve when the zoom lens is at the telephoto end in Example 3. In the figure, the dotted line represents the meridian, the solid line represents the sagittal, and the corresponding light wavelength is 587.6 nm.

Fig. 28 is an axial chromatic aberration curve when the zoom lens is at the telephoto end in Example 3. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG29 is a distortion curve of the zoom lens at the telephoto end in Example 3. The corresponding light wavelength in the figure is 587.6 nm.

It can be seen from FIG. 24 to FIG. 29 that the zoom lens provided in Example 3 has good imaging quality at both the wide-angle end and the telephoto end.

Example 4

Please refer to FIG. 30 and FIG. 31 , wherein FIG. 31 (a) is a schematic diagram of the zoom lens shown in FIG. 30 at the wide-angle end. FIG. 31 (b) is a schematic diagram of the zoom lens shown in FIG. 30 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side. The first lens group G1 includes a first lens L1 and a second lens L2 arranged from the object side to the image side. The second lens group G2 includes a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged from the object side to the image side. The third lens group G3 includes a seventh lens L7 and an eighth lens L8 arranged from the object side to the image side. The zoom lens 21 also includes an aperture 211, and the aperture 211 is arranged between the second lens L2 and the third lens L3.

For specific data of the zoom lens provided in Example 4, please refer to Tables 16 to 20.

Table 16 shows the parameters of the lenses, apertures, and filters of the zoom lens in Example 4, including the radius of curvature R, the interval d, the refractive index Nd, and the Abbe coefficient Vd. The units of the radius of curvature R and the interval d are both millimeters (mm). In Table 16, surface numbers 1-21 are the surfaces of the object, the lenses, apertures, and filters, and the imaging surface, which are marked in sequence from the object side to the image side. The object is recorded as OBJ, the aperture is recorded as STO, and the imaging surface is recorded as IMA.

Table 17 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 4, that is, the variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 18 shows the k value and aspheric coefficient of the aspheric mirror surface of each lens in Example 4. Table 18 includes Table 18a, Table 18b, Table 18c, and Table 18d.

Table 19 shows the overall parameter data of the zoom lens in Example 4.

Table 20 shows the conditional expressions and corresponding data of the zoom lens in Example 4. In the following table, N is the number of lenses.

In this embodiment, the zoom lens 21 group is switched among the telephoto end, the wide-angle end, and the collapsed state by changing the interval d1 along the optical axis X between the first lens group G1 and the aperture 211 (i.e., the interval distance between the image side surface of the second lens L2 and the aperture 211 along the optical axis X), and the interval d2 along the optical axis X between the second lens group G2 and the third lens group G3 (i.e., the interval distance between the image side surface of the sixth lens L6 and the object side surface of the seventh lens L7 along the optical axis X).

Please refer to FIG. 32 to FIG. 34 , which show relevant curve diagrams at the wide-angle end of the zoom lens.

FIG32 is an astigmatism curve of the zoom lens at the wide angle end in Example 4. In the figure, the dotted line represents the meridian, the solid line represents the sagittal, and the corresponding light wavelength is 587.6 nm.

FIG33 is an axial chromatic aberration curve when the zoom lens is at the wide-angle end in Example 4. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG34 is a distortion curve of the zoom lens at the wide-angle end in Example 4. The corresponding light wavelength in the figure is 587.6 nm.

Please refer to FIG. 35 to FIG. 37 , which show relevant curve diagrams of the telephoto end of the zoom lens.

FIG35 is an astigmatism curve when the zoom lens is at the telephoto end in Example 4. In the figure, the dotted line represents the meridian, the solid line represents the sagittal, and the corresponding light wavelength is 587.6 nm.

Fig. 36 is an axial chromatic aberration curve when the zoom lens is at the telephoto end in Example 4. In the figure, the dotted line corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG37 is a distortion curve of the zoom lens at the telephoto end in Example 4. The corresponding light wavelength in the figure is 587.6 nm.

It can be seen from FIG. 32 to FIG. 37 that the zoom lens provided in Example 4 has good imaging quality both at the wide-angle end and the telephoto end.

Example 5

Please refer to FIG. 38 and FIG. 39, wherein FIG. 39(a) is a schematic diagram of the zoom lens shown in FIG. 38 at the wide-angle end. FIG. 39(b) is a schematic diagram of the zoom lens shown in FIG. 38 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side. The first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged from the object side to the image side. The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged from the object side to the image side. The third lens group G3 includes an eighth lens L8. The zoom lens 21 also includes an aperture 211, and the aperture 211 is arranged between the third lens L3 and the fourth lens L4.

For specific data of the zoom lens provided in Example 5, please refer to Tables 21 to 25.

Table 21 shows the parameters of the lenses, apertures, and filters of the zoom lens in Example 5, including the radius of curvature R, the interval d, the refractive index Nd, and the Abbe coefficient Vd. The units of the radius of curvature R and the interval d are both millimeters (mm). In Table 21, surface numbers 1-21 are the surfaces of the object, the lenses, apertures, and filters, and the imaging surface, which are marked in sequence from the object side to the image side. The object is recorded as OBJ, the aperture is recorded as STO, and the imaging surface is recorded as IMA.

Table 22 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 5, that is, the variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 23 shows the k value and aspheric coefficient of the aspheric mirror surface of each lens in Example 5. Table 23 includes Table 23a, Table 23b, Table 23c, and Table 23d.

Table 24 shows the overall parameter data of the zoom lens in Example 5.

Table 25 shows the conditional expressions and corresponding data of the zoom lens in Example 5. In the following table, N is the number of lenses.

In this embodiment, the zoom lens 21 group is switched among the telephoto end, the wide-angle end, and the collapsed state by changing the interval d1 between the first lens group G1 and the aperture 211 along the optical axis X (i.e., the interval distance between the image side surface of the third lens L3 and the aperture 211 along the optical axis X), and the interval d2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval distance between the image side surface of the seventh lens L7 and the object side surface of the eighth lens L8 along the optical axis X).

Please refer to FIG. 40 to FIG. 42 , which show relevant curve diagrams of the wide-angle end of the zoom lens.

Fig. 40 is an astigmatism curve when the zoom lens is at the wide angle end in Example 5. In the figure, the dotted line represents the meridian, the solid line represents the sagittal, and the corresponding light wavelength is 587.6nm.

Fig. 41 is an axial chromatic aberration curve when the zoom lens is at the wide-angle end in Example 5. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG42 is a distortion curve of the zoom lens at the wide-angle end in Example 5. The corresponding light wavelength in the figure is 587.6 nm.

Please refer to Figures 43 to 45, which show relevant curve graphs at the telephoto end of the zoom lens.

FIG43 is an astigmatism curve when the zoom lens is at the telephoto end in Example 5. In the figure, the dotted line represents the meridian, the solid line represents the sagittal, and the corresponding light wavelength is 587.6 nm.

Fig. 44 is an axial chromatic aberration curve when the zoom lens is at the telephoto end in Example 5. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG45 is a distortion curve of the zoom lens at the telephoto end in Example 5. The corresponding light wavelength in the figure is 587.6 nm.

It can be seen from Figures 40 to 45 that the zoom lens provided in Example 5 has good imaging quality both at the wide-angle end and the telephoto end.

Example 6

Please refer to Figures 46 and 47, wherein Figure 47(a) is a schematic diagram of the zoom lens shown in Figure 46 at the wide-angle end. Figure 47(b) is a schematic diagram of the zoom lens shown in Figure 46 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side. Among them, the first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged from the object side to the image side. The second lens group G2 includes a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged from the object side to the image side. The third lens group G3 includes an eighth lens L8. The zoom lens 21 also includes an aperture 211, and the aperture 211 is arranged between the third lens L3 and the fourth lens L4.

For specific data of the zoom lens provided in Example 6, please refer to Tables 26 to 30.

Table 26 shows the parameters of the lenses, apertures, and filters of the zoom lens in Example 6, including the radius of curvature R, the interval d, the refractive index Nd, and the Abbe coefficient Vd. The units of the radius of curvature R and the interval d are both millimeters (mm). In Table 26, surface numbers 1-21 are the surfaces of the object, the lenses, apertures, and filters, and the imaging surface, which are marked in sequence from the object side to the image side. The object is recorded as OBJ, the aperture is recorded as STO, and the imaging surface is recorded as IMA.

Table 27 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 6, that is, the variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 28 shows the k value and aspheric coefficient of the aspheric mirror surface of each lens in Example 6. Table 28 includes Table 28a, Table 28b, Table 28c, Table 28d, and Table 28e.

Table 29 shows the overall parameter data of the zoom lens in Example 6.

Table 30 shows the conditional expressions and corresponding data of the zoom lens in Example 6. In the following table, N is the number of lenses.

In this embodiment, the zoom lens 21 group is switched among the telephoto end, the wide-angle end, and the collapsed state by changing the interval d1 between the first lens group G1 and the aperture 211 along the optical axis X (i.e., the interval distance between the image side surface of the third lens L3 and the aperture 211 along the optical axis X), and the interval d2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval distance between the image side surface of the seventh lens L7 and the object side surface of the eighth lens L8 along the optical axis X).

Please refer to Figures 48 to 50, which show relevant curve graphs at the wide-angle end of the zoom lens.

FIG48 is an astigmatism curve when the zoom lens is at the wide angle end in Example 6. In the figure, the dotted line represents the meridian, and the solid line represents the sagittal, and the corresponding light wavelength is 587.6 nm.

Fig. 49 is an axial chromatic aberration curve when the zoom lens is at the wide angle end in Example 6. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG50 is a distortion curve of the zoom lens at the wide-angle end in Example 6. The corresponding light wavelength in the figure is 587.6 nm.

Please refer to Figures 51 to 53, which show relevant curve graphs at the telephoto end of the zoom lens.

FIG51 is an astigmatism curve when the zoom lens is at the telephoto end in Example 6. The dotted line in the figure represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 587.6 nm.

Fig. 52 is an axial chromatic aberration curve when the zoom lens is at the telephoto end in Example 6. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG53 is a distortion curve of the zoom lens at the telephoto end in Example 6. The corresponding light wavelength in the figure is 587.6 nm.

It can be seen from Figures 48 to 53 that the zoom lens provided in Example 6 has good imaging quality both at the wide-angle end and the telephoto end.

The above is the content of the first part. The second part will be introduced in detail below with reference to the accompanying drawings.

Part 2 (corresponding to FIGS. 54 to 83)

Please refer to Figures 54 to 56. The present application provides an electronic device 100, which includes a device body 1 and a camera module 2. The device body 1 has an opening K14, and the camera module 2 is arranged in the device body 1 corresponding to the opening K14. The zoom lens 21 of the camera module 2 can at least partially extend or retract into the device body 1 through the opening K14. When the user needs to take pictures, the zoom lens 21 can be controlled to extend out of the device body 1 through the opening K14 (as shown in Figure 55). When the user does not need to take pictures, the zoom lens 21 can be controlled to retract into the device body 1 through the opening K14 (as shown in Figure 54).

The electronic device 100 may be a mobile phone, a tablet computer, a laptop computer, a wearable device (such as a smart watch, a bracelet, a VR device, etc.), a television, an e-reader, or the like.

The device body 1 refers to the main part of the electronic device 100, which includes electronic components that realize the main functions of the electronic device 100 and a shell that protects and carries these electronic components. The device body 1 may include a display screen 11, a middle frame 12, and a back cover 13 (as shown in FIG. 56 ). The display screen 11 and the back cover 13 are both connected to the middle frame 12 and are arranged on opposite sides of the middle frame 12, and the side of the middle frame 12 is exposed outside the back cover 13 and the display screen 11.

It should be noted that, according to actual needs, the camera module 2 can be set on any side of the electronic device 100, and this application does not limit this. Taking a mobile phone as an example, the camera module 2 can be set on the front, back, and side of the mobile phone. Among them, the so-called front refers to the side of the mobile phone with a display screen 11; the so-called back refers to the side of the mobile phone with a back cover 13 (as shown in Figure 56); the so-called side refers to the circumferential side of the middle frame 12 of the mobile phone. It can be understood that the types of electronic devices 100 are different, and the definitions of the front, back, side, etc. may be different. For other types of electronic devices 100, they are not described in detail here.

Furthermore, the opening K14 may be provided on the back cover 13 (as shown in FIG. 56 ). In other embodiments, the opening K14 may also be provided on the display screen 11; or, the opening K14 is provided on the middle frame 12. When the back cover 13 has the opening K14, the camera module 2 is a rear camera. When the display screen 11 has the opening K14, the camera module is a front camera. It is understandable that the introduction of the device body 1 in this embodiment is merely an introduction to an application scenario of the camera module 2, and should not be understood as a limitation on the electronic device 100 provided in this application.

In the related art, as people pursue higher and higher image quality of electronic devices with shooting functions, such as high image quality and high pixels, it is usually necessary to design the photosensitive element and lens in the camera module. For example, a photosensitive element with a large bottom is used. Since the distance between the photosensitive element and the lens is not adjustable, it is necessary to design the distance between the lens and the photosensitive element to be longer. When the field of view (FOV) is basically unchanged, the distance between the lens and the photosensitive element is longer, which means that the total length of the camera module will also be longer. When the camera module is applied to electronic devices, the result is that the electronic device body will become thicker and thicker, which is not conducive to the thinning of electronic devices. In other words, for thin electronic devices, the length of the camera module will also be limited due to the thickness limit of the electronic device. When the thickness of the camera module is limited, since the distance between the photosensitive element and the lens is not adjustable, the distance between the lens and the photosensitive element in the camera lens module will be limited. If the thickness of the camera lens module is designed to be thicker and the thickness of the electronic device is thinner, the camera module may form a thicker protrusion on the back cover of the electronic device. Therefore, when the camera module in the related art is applied to electronic devices, it is impossible to achieve the compatibility between the thinness of the electronic devices and the high imaging quality of the camera module.

In the electronic device 100 provided in the embodiment of the present application, since the zoom lens 21 can be extended or retracted into the device body 1 through the opening K14, the camera module 2 can have a larger focal length without affecting the thickness of the electronic device 100, thereby solving the incompatibility problem between the thinness of the electronic device 100 and the high imaging quality of the camera module 2.

Please refer to FIG. 57 , the present application also provides a camera module 2, the camera module 2 includes a filter 22, a photosensitive element 23 and a zoom lens 21 described in any of the following embodiments. The zoom lens 21, the filter 22 and the photosensitive element 23 are arranged in sequence along the optical axis X. When shooting, the external light passes through the zoom lens 21 and the filter 22 in sequence, and finally reaches the photosensitive element 23. The first lens group G1 and the second lens group G2 of the zoom lens 21 can move relative to the photosensitive element 23 along the optical axis X.

The zoom lens 21 is used to collect light from the scene being photographed and focus the light on the photosensitive element 23. The filter 22 is used to eliminate unnecessary light to improve the effective resolution and color reproduction. The filter 22 can be, but is not limited to, an infrared filter 22. The photosensitive element 23 (Sensor) is also called a photosensitive chip or an image sensor, which is used to receive the light passing through the filter 22 and convert the light signal into an electrical signal. The photosensitive element 23 can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The photosensitive element 23 has an imaging surface S231, and the imaging surface S231 is a target surface on the photosensitive element 23 that receives light.

It should be noted that the imaging surface S231 and the filter 22 involved in the following embodiments of the zoom lens 21 are used to assist in describing the positions of the first lens group G1 and the second lens group G2, and do not mean that the zoom lens 21 includes a photosensitive element 23 with an imaging surface S231 and a filter 22.

The zoom lens 21 in the camera module 2 is described in detail below with reference to the accompanying drawings.

Please refer to FIG. 57 , the present application also provides a zoom lens 21, the zoom lens 21 comprises: a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The object side and the image side respectively refer to: with the zoom lens 21 as the boundary, the side where the object is located is the object side, and the side where the image formed by the object is located is the image side. Therefore, when shooting, the light first passes through the first lens group G1 closer to the object side, and then passes through the second lens group G2 closer to the image side.

The first lens group G1 has positive focal power. The second lens group G2 has negative focal power. The focal power characterizes the ability of an optical system (lens or lens group) to deflect light. Generally speaking, the focal power is also the reciprocal of the image focal length. A positive focal power of an optical system indicates that it has a converging effect on light. A negative focal power of an optical system indicates that it has a diverging effect on light.

The first lens group G1 and the second lens group G2 are both used to achieve zooming by moving, and thus both can be referred to as zoom lens groups.

Either the first lens group G1 or the second lens group G2 is a compensation lens group. That is, the first lens group G1 is a compensation lens group, or the second lens group G2 is a compensation lens group. The so-called compensation lens group refers to a lens group used to compensate the image plane position so that the focus of the object at different distances falls on the imaging plane S231.

Optionally, the lens on the most image side of the first lens group G1 has positive refractive power. Such an arrangement can enable the zoom lens 21 to provide a better imaging effect. The so-called lens on the most image side refers to the lens closest to the image side in the first lens group G1.

Please refer to Figure 58, the zoom lens 21 has a telephoto end and a wide-angle end. The first lens group G1 and the second lens group G2 can both move along the optical axis X direction to switch the zoom between the telephoto end and the wide-angle end. The telephoto end refers to the state when the focal length of the zoom lens 21 is the largest, and the telephoto end can also be called the telephoto state. The wide-angle end refers to the state when the focal length of the zoom lens 21 is the smallest, and the wide-angle end can also be called the wide-angle state. When the zoom lens 21 is at the telephoto end, the positions of the first lens group G1 and the second lens group G2 are different from the positions of the first lens group G1 and the second lens group G2 when the zoom lens 21 is at the wide-angle end. Therefore, the telephoto end and the wide-angle end are two different shooting states of the zoom lens 21, wherein the telephoto end is used for telephoto shooting, and the wide-angle end is used for wide-angle shooting.

In the related technology, the mobile phone is equipped with at least three lenses, including a telephoto lens, a main camera lens, and an ultra-wide-angle lens. Among them, the telephoto lens is used for telephoto shooting, and the main camera and the ultra-wide-angle lens are both used for wide-angle shooting, and the field of view of the main camera is smaller than that of the ultra-wide-angle lens. However, this design will first lead to a larger volume of the entire camera module and increase product costs. In addition, since the lenses for different purposes are set separately, each lens can only be used with a small-bottom photosensitive element, which affects the image quality.

In the zoom lens 21 provided in the embodiment of the present application, since both the first lens group G1 and the second lens group G2 can be moved along the optical axis X direction, the zoom lens 21 can be switched between the telephoto end and the wide-angle end by moving the first lens group G1 and the second lens group G2. Compared with the related art, the zoom lens 21 provided in the present embodiment is equivalent to integrating the telephoto lens and the main camera lens, thereby reducing the module volume and reducing the cost, and can be matched with a large-bottom photosensitive element 23 (for example, a 1/1.28-inch photosensitive element 23) to achieve 50 million pixel imaging from the wide-angle end to the telephoto end, thereby improving the imaging quality (for example, achieving high-pixel shooting and reducing the signal-to-noise ratio).

Optionally, the telephoto end of the zoom lens 21 satisfies the relationship: 1.8＜TTLt/ImgH＜3.6. Wherein, TTLt is the total optical length of the zoom lens 21 when it is at the telephoto end. ImgH is the image height, which refers to half of the diagonal length of the effective pixel area of the imaging surface S231. It should be noted that the total optical length refers to the distance from the surface of the first lens group G1 closest to the object side to the imaging surface S231. Please refer to here for the following description of the total optical length.

The TTLt/ImgH may be, but is not limited to, 1.9, 2.0, 2.1, 2.2, 2.3, 2.33, 2.5, 2.7, 2.8, 2.81, 2.9, 3.0, 3.2, 3.3, etc. For example, TTLt is 16.518 mm and ImgH is 6.450 mm; or TTLt is 17.873 mm and ImgH is 6.450 mm; or TTLt is 15.268 mm and ImgH is 6.450 mm.

Since the zoom lens 21 satisfies the above relationship, the zoom lens 21 can not only be miniaturized, but also effectively maintain good optical performance. It can be understood that the miniaturized zoom lens 21 is more suitable for electronic devices 100 that require lightness and thinness, such as mobile phones.

In the related art, zoomable camera modules have been applied to electronic devices with thin and light requirements such as mobile phones. Specifically, since the zoom function requires that the lens in the camera module can move relative to the photosensitive element, the total length of the camera module must be long, generally greater than the thickness of the electronic device. In order to avoid the electronic device being too thick, a periscope camera is usually used at present, and the length direction of the periscope camera is arranged in accordance with the width direction (or length direction) of the electronic device, that is, the length direction of the periscope camera is arranged perpendicular to the thickness direction of the electronic device. A prism is provided in the periscope camera, which is used to receive and reflect external light so that the reflected light propagates along the length direction of the periscope camera. However, the periscope camera is suitable for telephoto shooting, but not for wide-angle shooting, because wide-angle shooting requires the camera to have a large field of view. As the field of view increases, the thickness of the prism will also increase, and thus cannot meet the thickness of the electronic device. Moreover, specifications such as aperture and peripheral brightness will also be limited by the thickness of the prism.

In the present application, when the zoom lens 21 is applied to the electronic device 100, the zoom lens 21 can be extended or retracted through the opening K14 on the device body 1, so that the first lens group G1 and the second lens group G2 move relative to the photosensitive element 23, thereby achieving zooming. In this structural form, no prism is involved, so the technical problems caused by the above prism will not occur. Therefore, the zoom lens 21 provided in the present application can improve the imaging quality.

Please refer to Figure 57. The zoom lens 21 also has a retracted state. When the zoom lens 21 is in the retracted state, the relationship is satisfied: cTTL<TTLw and cTTL<TTLt. Among them, cTTL is the total optical length of the zoom lens 21 when it is in the retracted state, and TTLw is the total optical length of the zoom lens 21 when it is at the wide-angle end. TTLt is the total optical length of the zoom lens 21 when it is at the telephoto end. In other words, among the above three states, the total optical length cTTL when the zoom lens 21 is in the retracted state is the shortest, which is smaller than the total optical length corresponding to the telephoto end and the wide-angle end, so cTTL is the minimum total length of the zoom lens 21. Therefore, when the user needs to shoot, the zoom lens 21 can be controlled to extend to switch to the wide-angle end or the telephoto end. When shooting is not needed, the zoom lens 21 can be controlled to shorten to switch to the retracted state. In conjunction with the electronic device 100 provided in the previous embodiment, when the zoom lens 21 is extended to switch to the wide-angle end or the telephoto end, it extends out of the electronic device 100 through the opening K14; when the zoom lens 21 is shortened to switch to the retracted state, the zoom lens 21 is retracted into the electronic device 100.

Further, the zoom lens 21 satisfies: cTTL<TTLw<TTLt; that is, when the zoom lens 21 is at the telephoto end, the total optical length TTLt is greater than the total optical length TTLw when the zoom lens 21 is at the wide-angle end, and thus TTLt is the maximum total length of the zoom lens 21. From the perspective of zooming, during the process of the zoom lens 21 switching from the retracted state to the wide-angle end, the first lens group G1 moves along the optical axis X toward the object side (please refer to Figures 57 and 58). During the zooming process of the zoom lens 21 from the wide-angle end to the telephoto end, the first lens group G1 moves along the optical axis X toward the object side, and the second lens group G2 moves along the optical axis X toward the object side (please refer to Figure 58). It should be noted that during the process of the zoom lens 21 switching from the retracted state to the wide-angle end, the second lens group G2 can remain stationary or move along the optical axis X toward the object side.

Optionally, the retracted state of the zoom lens 21 satisfies the relationship: 1<cTTL/ImgH<2. Wherein, cTTL is the total optical length of the zoom lens 21 when it is in the retracted state, and ImgH is the image height.

Among them, cTTL/ImgH can be but not limited to 1.1, 1.2, 1.24, 1.3, 1.4, 1.5, 1.55, 1.6, 1.7, 1.8, 1.9, etc. For example, cTTL is 9 mm and ImgH is 6.45 mm; or cTTL is 10 mm and ImgH is 6.45 mm; or cTTL is 8.5 mm and ImgH is 6.45 mm.

From the above data, it can be seen that when the value of ImgH is 6.45 mm, TTLt is about 20 mm, and cTTL is about 10 mm, so the zoom lens 21 provided in the present application can be applied to electronic devices 100 with thin and light requirements, such as mobile phones. This allows the zoom lens 21 to be not only miniaturized, but also effectively maintain good optical performance.

Optionally, when the zoom lens 21 is in a retracted state, both the first lens group G1 and the second lens group G2 are located inside the device body 1 .

Optionally, when the zoom lens 21 is at the wide-angle end, the first lens group G1 is at least partially located outside the device body 1 .

Optionally, when the zoom lens 21 is at the wide-angle end, the second lens group G2 is at least partially located within the device body 1 .

Optionally, when the zoom lens 21 is at the telephoto end, the first lens group G1 is located outside the device body 1 , and the second lens group G2 is at least partially located outside the device body 1 .

Please refer to FIG. 57 , the zoom lens 21 further includes an aperture 211. The aperture 211 is disposed on the object side of the first lens group G1 or inside the first lens group G1 or on the image side of the first lens group G1. During the zooming process of the zoom lens 21, the aperture 211 moves following the first lens group G1. In other words, the aperture 211 can be disposed on the object side or the image side of the first lens group G1, or can be disposed between two adjacent lenses constituting the first lens group G1. The aperture 211 is relatively fixed to the first lens group G1, and during the zooming process, the aperture 211 moves together with the first lens group G1. Since the arrangement between the lenses in the first lens group G1 is relatively sparse, and the arrangement between the lenses in the second lens group G2 is relatively dense, fixing the aperture 211 to the first lens group G1 can reasonably utilize the space, and the radial dimensions of the lenses in the first lens group G1 are relatively small, so the aperture 211 is easier to be fixed to the first lens group G1.

Optionally, please refer to Figure 59, the zoom lens 21 also includes a third lens group G3, and the third lens group G3 is fixedly arranged on the image side of the second lens group G2. The third lens group G3 is used to correct the chief ray incident angle (Chief Ray Angle, CRA) at the wide-angle end and the telephoto end. CRA is a parameter of the sensor, and the light needs to be incident on the sensor at the required angle. For the zoom lens 21, the CRA at the wide-angle end and the telephoto end needs to be consistent. Therefore, the third lens group G3 is used to ensure that the zoom lens 21 has good imaging quality.

Optionally, the total number of lenses in the first lens group G1 is 3-5, that is, it can be 3, 4 or 5.

Optionally, the total number of lenses in the second lens group G2 is 2-4, that is, it can be 2, 3 or 4.

Optionally, when the zoom lens 21 includes a third lens group G3, the total number of lenses in the third lens group G3 is 1-2, that is, it can be 1 or 2.

It should be noted that, for a lens, each lens in the first lens group G1, the second lens group G2, and the third lens group G3 can be a glass lens or a plastic lens. Each lens can have a positive optical power or a negative optical power. Furthermore, the surface of the lens close to the object side is called the object side surface, and the surface of the lens close to the image side is called the image side surface. The object side surface of each lens in the above three lens groups can be a spherical surface, an aspherical surface, etc., and similarly, the image side surface of each lens can be a spherical surface, an aspherical surface, etc.

Optionally, referring to FIG. 60 , the number of critical points Q of at least one lens in the zoom lens 21 is greater than or equal to 2. In other words, the zoom lens 21 includes at least one lens having 2 critical points Q or more. The critical point Q refers to a point of tangency on the lens surface that is tangent to a tangent plane perpendicular to the optical axis X, except for the intersection with the optical axis X. When a lens has 2 or more critical points Q, the shape change of the lens in the radial direction will be relatively gentle, thereby avoiding the thickness of the lens being too large, thereby reducing the space occupied by the lens in the direction from the object side to the image side, so as to miniaturize the zoom lens 21, which is more conducive to application in electronic devices 100 with thin and light requirements.

Optionally, referring to FIG. 61 , the zoom lens 21 further includes a first carrier 212 and a second carrier 213. The first carrier 212 may be sleeved on the outer periphery of the second carrier 213. The first carrier 212 and the second carrier 213 may both move relative to each other along the optical axis X. The first lens group G1 is fixed in the first carrier 212. The first carrier 212 is used to drive the first lens group G1 to move relative to the photosensitive element 23 along the optical axis X. The second lens group G2 is fixed in the second carrier 213. The second carrier 213 is used to drive the second lens group G2 to move relative to the photosensitive element 23 along the optical axis X. The first carrier 212 may be disposed in the opening K14 of the electronic device 100, and the first carrier 212 and the second carrier 213 may extend or retract into the electronic device 100 through the opening K14. Of course, the bearing form of the first lens group G1 and the second lens group G2 may also be other forms, and the structure shown in FIG. 61 is only an exemplary description and should not be regarded as a limitation of the present application.

Optionally, the zoom lens 21 satisfies the relationship: 1<fw/ImgH<1.7, wherein fw is the focal length at the wide-angle end.

fw/ImgH can be, but is not limited to, 1.1, 1.2, 1.3, 1.32, 1.4, 1.5, 1.6, etc. For example, fw is 9.2607 mm and ImgH is 6.45 mm; or fw is 9 mm and ImgH is 6.45 mm; or fw is 8.2 mm and ImgH is 6.45 mm.

In this embodiment, the ratio of the focal length fw at the wide-angle end to the image height ImgH is set to be greater than 1 and less than 1.7, thereby ensuring that the focal length at the wide-angle end is within the commonly used focal length range of the main camera of the mobile phone.

Optionally, the zoom lens 21 satisfies the relationship: -1＜f1/f2＜-0.5, wherein f1 is the focal length of the first lens group G1, and f2 is the focal length of the second lens group G2.

f1/f2 can be, but is not limited to, -0.9, -0.8, -0.82, -0.7, -0.76, -0.6, -0.61, etc. For example, f1 is 8.227 mm, f2 is -10.971 mm; or f1 is 6.674 mm, f2 is -8.551 mm; or f1 is 7.071 mm, f2 is -8.976 mm.

In this embodiment, the ratio of the focal length f1 of the first lens group G1 to the focal length f2 of the second lens group G2 is set to be greater than -1 and less than -0.5, so that the optical power relationship between the first lens group G1 and the second lens group G2 can be reasonably distributed to better achieve focusing and zooming.

Optionally, the zoom lens 21 satisfies the relationship: 0.15＜Δd/TTLt＜0.5. Wherein, Δd is the distance that the first lens group G1 moves when the zoom lens 21 is zooming from the wide-angle end to the telephoto end; TTLt is the total optical length when the zoom lens 21 is at the telephoto end. Δd/TTLt can be, but is not limited to, 0.16, 0.17, 0.19, 0.2, 0.21, 0.26, 0.3, 0.32, 0.4, 0.45, etc. For example, Δd is 3.640mm and TTLt is 16.518mm; or Δd is 5.347mm and TTLt is 17.873mm; or Δd is 3.648mm and TTLt is 15.268mm.

In this embodiment, the ratio of the moving distance of the first lens group G1 from the wide-angle end to the telephoto end to the maximum optical total length of the zoom lens 21 is reasonably set between 0.15 and 0.5, so that a larger magnification ratio can be achieved with a smaller change in the lens group interval, which is beneficial to compressing the total length of the zoom lens 21.

Optionally, the zoom lens 21 satisfies the relationship: 1.5<tan(hFOVw)/tan(hFOVt). Wherein, hFOVw is the half picture angle when the zoom lens 21 is at the wide-angle end, and hFOVt is the half picture angle when the zoom lens 21 is at the telephoto end. Wherein, the half picture angle refers to half of the field of view (FOV).

Tan(hFOVw)/tan(hFOVt) may be, but is not limited to, 1.6, 1.71, 1.8, 1.9, 2.0, 2.1, 2.2, 2.25, etc. For example, hFOVw is 42.005° and hFOVt is 23.218°; or hFOVw is 34.821° and hFOVt is 22.486°; or hFOVw is 41.672° and hFOVt is 25.120°.

In this embodiment, the ratio of tan(hFOVw) to tan(hFOVt) is set to be greater than 1.5, so that the zoom ratio of the zoom lens 21 is greater than 1.5 times.

Optionally, the zoom lens 21 satisfies the relationship: fw/ENPw<2.4, wherein fw is the focal length at the wide-angle end, and ENPw is the entrance pupil diameter when the zoom lens 21 is at the wide-angle end.

fw/ENPw can be, but is not limited to, 2.3, 2.26, 2.2, 2.18, 2.1, 2.0, 1.98, 1.9, 1.8, etc. For example, fw is 9.2607 mm and ENPw is 4.677 mm; or fw is 9 mm and ENPw is 4.091 mm; or fw is 8.2 mm and ENPw is 4.141 mm.

In this embodiment, by setting the ratio of the focal length at the wide angle end to the entrance pupil diameter at the wide angle end to be less than 2.4, the aperture at the wide angle end is below 2.4, thereby improving the brightness and blurring effect of the lens. The higher the brightness of the lens, the more light enters the lens, which means that clear imaging can be achieved at night.

Optionally, for any of the above embodiments, the total number of lenses N in the zoom lens 21 satisfies: 5≤N≤10. The total number of lenses N may be 5, 6, 7, 8, 9, or 10. For example, the total number of lenses in the first lens group G1 is 4, the total number of lenses in the second lens L2 is 3, and the total number of lenses in the third lens group G3 is 0. Alternatively, the total number of lenses in the first lens group G1 is 4, the total number of lenses in the second lens L2 is 3, and the total number of lenses in the third lens group G3 is 1.

When the number of lenses in the zoom lens is greater, the imaging effect of the zoom lens 21 is better. When the number of lenses in the zoom lens is smaller, the cost is lower and the minimum optical total length cTTL is smaller. When the total number of lenses N is less than 5, the imaging quality cannot be guaranteed; when the total number of lenses N is greater than 10, the optical total length of the zoom lens 21 is too large and is not suitable for application in an electronic device 100 with a requirement for thinness. The embodiment of the present application takes into account both imaging quality and optical total length and selects the total number of lenses to be between 5 and 10, so as to ensure that the zoom lens 21 has a good imaging effect while achieving the beneficial effect of miniaturization of the zoom lens 21.

By using the zoom lens 21 provided in the present application, the maximum optical total length TTLt of the zoom lens 21 can be controlled below 26 mm (for example, 20 mm). The minimum optical total length cTTL of the zoom lens 21 can be controlled below 11 mm (for example, 10 mm). The field of view at the wide-angle end can be achieved below 90 degrees. The field of view at the telephoto end can be achieved less than 50 degrees. Therefore, the zoom lens 21 provided in the present application can not only be well adapted to the electronic device 100 with the requirements of being lightweight, but also have good shooting performance.

The zoom lens 21 provided by the present application is further described below through three groups of specific embodiments. In the following embodiments, the calculation formulas for each aspherical surface are:

Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the reciprocal of the curvature radius R in the following table); k is the cone coefficient (see the table); Ai is the i-th order aspheric coefficient.

Example 1

Please refer to FIG. 57 and FIG. 58, wherein FIG. 58(a) is a schematic diagram of the zoom lens shown in FIG. 57 at the wide-angle end. FIG. 58(b) is a schematic diagram of the zoom lens shown in FIG. 57 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The first lens group G1 is a lens group with positive optical power, and the second lens group G2 is a lens group with negative optical power. The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged from the object side to the image side. The second lens group G2 includes a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged from the object side to the image side. The zoom lens 21 also includes a stop 211, and the stop 211 is arranged between the third lens L3 and the fourth lens L4.

For specific data of the zoom lens provided in Example 1, please refer to Tables 31 to 35.

Table 31 shows the parameters of the lenses, apertures, and filters of the zoom lens in Example 1, including the radius of curvature R, the interval d, the refractive index Nd, and the Abbe coefficient Vd. The units of the radius of curvature R and the interval d are both millimeters (mm). In Table 31, surface numbers 1-19 are the surfaces of the object, the lenses, apertures, and filters, and the imaging surface, which are marked in sequence from the object side to the image side. The object is recorded as OBJ, the aperture is recorded as STO, and the imaging surface is recorded as IMA.

It should be noted that the interval d represents the interval distance d between the current surface and the next surface along the optical axis. For example, the interval between surface 2 and surface 3 in Table 31 is 0.465, and the interval between surface 3 and surface 4 is 0.729. Please refer to this for the interval d mentioned later.

Table 32 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 1, that is, the variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 33 shows the k value and aspheric coefficient of the aspheric mirror surface of each lens in Example 1. Table 33 includes Table 33a, Table 33b, Table 33c, and Table 33d.

Table 34 shows the overall parameter data of the zoom lens in Example 1.

Table 35 shows the conditional expressions and corresponding data of the zoom lens in Example 1. In the following table, N is the number of lenses.

In this embodiment, the zoom lens 21 group is switched among the telephoto end, the wide-angle end, and the collapsed state by changing the interval d1 along the optical axis X between the first lens group G1 and the second lens group G2 (i.e., the interval distance between the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 along the optical axis X), and the interval d2 along the optical axis X between the second lens group G2 and the filter 22 (i.e., the interval distance between the image side surface of the seventh lens L7 and the object side surface of the filter 22 along the optical axis X).

Please refer to Figures 62 to 64, which show relevant curve graphs at the wide-angle end of the zoom lens.

FIG62 is an astigmatism curve of the zoom lens at the wide angle end in Example 1. The dotted line in the figure represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 587.6 nm.

Fig. 63 is an axial chromatic aberration curve when the zoom lens is at the wide-angle end in Example 1. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG64 is a distortion curve of the zoom lens at the wide-angle end in Example 1. The corresponding light wavelength in the figure is 587.6 nm.

Please refer to Figures 65 to 67, which show relevant curve graphs at the telephoto end of the zoom lens.

FIG65 is an astigmatism curve when the zoom lens is at the telephoto end in Example 1. The dotted line in the figure represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 587.6 nm.

Fig. 66 is an axial chromatic aberration curve when the zoom lens is at the telephoto end in Example 1. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG67 is a distortion curve of the zoom lens at the telephoto end in Example 1. The corresponding light wavelength in the figure is 587.6 nm.

It can be seen from Figures 62 to 67 that the zoom lens provided in Example 1 has good imaging quality both at the wide-angle end and the telephoto end.

Example 2

Please refer to FIG. 68 and FIG. 69, wherein FIG. 69(a) is a schematic diagram of the zoom lens shown in FIG. 68 at the wide-angle end. FIG. 69(b) is a schematic diagram of the zoom lens shown in FIG. 68 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1, a second lens group G2, and a third lens group G3 arranged from the object side to the image side. The first lens group G1 is a lens group with positive optical power, and the second lens group G2 is a lens group with negative optical power. The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged from the object side to the image side. The second lens group G2 includes a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged from the object side to the image side. The third lens group G3 includes an eighth lens L8. The zoom lens 21 also includes a stop 211, and the stop 211 is arranged between the third lens L3 and the fourth lens L4.

For specific data of the zoom lens provided in Example 2, please refer to Tables 36 to 40.

Table 36 shows the parameters of the lenses, apertures, and filters of the zoom lens in Example 2, including the radius of curvature R, the interval d, the refractive index Nd, and the Abbe coefficient Vd. The units of the radius of curvature R and the interval d are both millimeters (mm). In Table 36, surface numbers 1-21 are the surfaces of the object, the lenses, apertures, and filters, and the imaging surface, which are marked in sequence from the object side to the image side. The object is recorded as OBJ, the aperture is recorded as STO, and the imaging surface is recorded as IMA.

Table 37 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 2, that is, the variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 38 shows the k value and aspheric coefficient of the aspheric mirror surface of each lens in Example 2. Table 38 includes Table 38a, Table 38b, Table 38c, and Table 38d.

Table 39 shows the overall parameter data of the zoom lens in Example 2.

Table 40 shows the conditional expressions and corresponding data of the zoom lens in Example 2. In the following table, N is the number of lenses.

In this embodiment, the zoom lens 21 group is switched among the telephoto end, the wide-angle end, and the collapsed state by changing the interval d1 between the first lens group G1 and the second lens group G2 along the optical axis X (i.e., the interval distance between the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 along the optical axis X), and the interval d2 between the second lens group G2 and the third lens group G3 along the optical axis X (i.e., the interval distance between the image side surface of the seventh lens L7 and the object side surface of the eighth lens L8 along the optical axis X).

Please refer to Figures 70 to 72, which show relevant curve graphs at the wide-angle end of the zoom lens.

FIG70 is an astigmatism curve when the zoom lens is at the wide angle end in Example 2. In the figure, the dotted line represents the meridian, and the solid line represents the sagittal, and the corresponding light wavelength is 587.6 nm.

FIG71 is an axial chromatic aberration curve when the zoom lens is at the wide-angle end in Example 2. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG72 is a distortion curve of the zoom lens at the wide-angle end in Example 2. The corresponding light wavelength in the figure is 587.6 nm.

Please refer to Figures 73 to 75, which show relevant curve graphs at the telephoto end of the zoom lens.

FIG73 is an astigmatism curve when the zoom lens is at the telephoto end in Example 2. In the figure, the dotted line represents the meridian, the solid line represents the sagittal, and the corresponding light wavelength is 587.6 nm.

Fig. 74 is an axial chromatic aberration curve when the zoom lens is at the telephoto end in Example 2. In the figure, the dotted line corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG75 is a distortion curve of the zoom lens at the telephoto end in Example 2. The corresponding light wavelength in the figure is 587.6 nm.

It can be seen from Figures 70 to 75 that the zoom lens provided in Example 2 has good imaging quality both at the wide-angle end and the telephoto end.

Example 3

Please refer to FIG. 76 and FIG. 77, wherein FIG. 77(a) is a schematic diagram of the zoom lens shown in FIG. 76 at the wide-angle end. FIG. 77(b) is a schematic diagram of the zoom lens shown in FIG. 76 at the telephoto end. The zoom lens 21 provided in this embodiment includes: a first lens group G1 and a second lens group G2 arranged from the object side to the image side. The first lens group G1 is a lens group with positive optical power, and the second lens group G2 is a lens group with negative optical power. The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged from the object side to the image side. The second lens group G2 includes a fifth lens L5, a sixth lens L6, and a seventh lens L7 arranged from the object side to the image side. The zoom lens 21 also includes a stop 211, and the stop 211 is arranged between the third lens L3 and the fourth lens L4.

For specific data of the zoom lens provided in Example 3, please refer to Tables 41 to 45.

Table 41 shows the parameters of the lenses, apertures, and filters of the zoom lens in Example 3, including the radius of curvature R, the interval d, the refractive index Nd, and the Abbe coefficient Vd. The units of the radius of curvature R and the interval d are both millimeters (mm). In Table 41, surface numbers 1-19 are the surfaces of the object, the lenses, apertures, and filters, and the imaging surface, which are marked in sequence from the object side to the image side. The object is recorded as OBJ, the aperture is recorded as STO, and the imaging surface is recorded as IMA.

Table 42 shows the variable interval d when the zoom lens changes from the wide-angle end to the telephoto end in Example 3, that is, the variable interval d corresponding to when the zoom lens is at the wide-angle end and the telephoto end.

Table 43 shows the k value and aspheric coefficient of the aspheric mirror surface of each lens in Example 3. Table 43 includes Table 43a, Table 43b, Table 43c, and Table 43d.

Table 44 shows the overall parameter data of the zoom lens in Example 3.

Table 45 shows the conditional expressions and corresponding data of the zoom lens in Example 3. In the following table, N is the number of lenses.

In this embodiment, the zoom lens 21 group is switched among the telephoto end, the wide-angle end, and the collapsed state by changing the interval d1 along the optical axis X between the first lens group G1 and the second lens group G2 (i.e., the interval distance between the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 along the optical axis X), and the interval d2 along the optical axis X between the second lens group G2 and the filter 22 (i.e., the interval distance between the image side surface of the seventh lens L7 and the object side surface of the filter 22 along the optical axis X).

Please refer to Figures 78 to 80, which show relevant curve graphs at the wide-angle end of the zoom lens.

FIG78 is an astigmatism curve when the zoom lens is at the wide angle end in Example 3. The dotted line in the figure represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 587.6 nm.

FIG79 is an axial chromatic aberration curve when the zoom lens is at the wide-angle end in Example 3. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG80 is a distortion curve of the zoom lens at the wide-angle end in Example 3. The corresponding light wavelength in the figure is 587.6 nm.

Please refer to Figures 81 to 83, which show relevant curve graphs at the telephoto end of the zoom lens.

FIG81 is an astigmatism curve when the zoom lens is at the telephoto end in Example 3. The dotted line in the figure represents the meridian, and the solid line represents the sagittal, corresponding to a light wavelength of 587.6 nm.

FIG82 is an axial chromatic aberration curve when the zoom lens is at the telephoto end in Example 3. The dotted line in the figure corresponds to a light wavelength of 656.3 nm, the solid line corresponds to a light wavelength of 587.6 nm, and the dashed line corresponds to a light wavelength of 486.1 nm.

FIG83 is a distortion curve of the zoom lens at the telephoto end in Example 3. The corresponding light wavelength in the figure is 587.6 nm.

It can be seen from Figures 78 to 83 that the zoom lens provided in Example 3 has good imaging quality both at the wide-angle end and the telephoto end.

Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also regarded as the scope of protection of the present application.

Claims (34)

1. A zoom lens, characterized in that the zoom lens comprises: a first lens group and a second lens group arranged along an object side to an image side; the first lens group has negative focal power, and the second lens group has positive focal power; the zoom lens has a telephoto end and a wide-angle end, and the first lens group and the second lens group are each movable in an optical axis direction to zoom-switch between the telephoto end and the wide-angle end; the critical point number of at least one lens in the zoom lens is more than or equal to 2; the wide-angle end of the zoom lens satisfies the relation: 2.5 < TTLw/ImgH < 4; wherein TTLw is the total optical length of the zoom lens at the wide-angle end, and ImgH is the image height.
2. The zoom lens of claim 1, wherein the zoom lens further has a collapsed state, the relationship being satisfied when the zoom lens is in the collapsed state: cTTL < TTLw and cTTL < TTLt, wherein cTTL is the optical total length of the zoom lens in the collapsed state and TTLt is the optical total length of the zoom lens at the telephoto end.
3. The zoom lens according to claim 2, wherein a contracted state of the zoom lens satisfies a relation: 1 < cTTL/ImgH < 2.
4. The zoom lens according to claim 2, wherein the first lens group and the second lens group move in an object-side direction along an optical axis in a process of switching the zoom lens from the collapsed state to the telephoto end.
5. The zoom lens according to claim 1, wherein the first lens group moves toward the image side along the optical axis and the second lens group moves toward the object side along the optical axis during zooming of the zoom lens from the wide-angle end to the telephoto end.
6. The zoom lens according to claim 1, further comprising a diaphragm provided on an object side of the second lens group or inside the second lens group, wherein the diaphragm and the second lens group move in synchronization during zooming of the zoom lens.
7. The zoom lens according to claim 1, further comprising a third lens group having negative power, the third lens group being fixedly disposed on an image side of the second lens group.
8. The zoom lens of claim 7, wherein the total number of lenses in the third lens group is 1-2.
9. The zoom lens according to any one of claims 1 to 8, wherein the total number of lenses in the first lens group is 2 to 3; and/or the total number of lenses in the second lens group is 3-5.
10. The zoom lens according to any one of claims 1 to 8, wherein the zoom lens satisfies the relation: 1 < fw/ImgH < 1.7, wherein fw is the wide-angle end focal length.
11. The zoom lens according to any one of claims 1 to 8, wherein the zoom lens satisfies the relation: -3 < f1/f2 < -1.2, wherein f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.
12. The zoom lens according to any one of claims 1 to 8, wherein the zoom lens satisfies the relation: 0.05 < Deltad/TTLw < 0.25, wherein Deltad is the distance that the second lens group moves during zooming of the zoom lens from the wide-angle end to the telephoto end.
13. The zoom lens according to any one of claims 1 to 8, wherein the zoom lens satisfies the relation: 1.5< tan (hFOVw)/tan (hfovit), wherein hFOVw is a half angle of view of the zoom lens at a wide angle end, and hFOVt is a half angle of view of the zoom lens at a telephoto end.
14. The zoom lens of any of claims 1-8, wherein the zoom lens satisfies a relationship ft/ENPt < 3, where ft is a focal length of the telephoto end and ENPt is an entrance pupil diameter when the zoom lens is at the telephoto end.
15. A zoom lens according to any one of claims 1 to 8, wherein the lens on the most object side of the first lens group has negative optical power and/or the lens on the most object side of the second lens group has positive optical power.
16. The zoom lens according to any one of claims 1 to 8, wherein the total number of lenses N in the zoom lens satisfies: n is more than or equal to 5 and less than or equal to 10.
17. A zoom lens, characterized in that the zoom lens comprises: a first lens group and a second lens group arranged along an object side to an image side; the first lens group has positive focal power, and the second lens group has negative focal power; the zoom lens has a telephoto end and a wide-angle end, and the first lens group and the second lens group are each movable in an optical axis direction to zoom-switch between the telephoto end and the wide-angle end; the critical point number of at least one lens in the zoom lens is more than or equal to 2; the telescopic end of the zoom lens satisfies the relation: 1.8 < TTLt/ImgH < 3.6; wherein TTLt is the total optical length of the zoom lens at the telephoto end, and ImgH is the image height.
18. The zoom lens of claim 1, wherein the zoom lens further has a collapsed state, the relationship being satisfied when the zoom lens is in the collapsed state: cTTL < TTLw and cTTL < TTLt, where cTTL is the optical total length of the zoom lens in the collapsed state and TTLw is the optical total length of the zoom lens at the wide-angle end.
19. The zoom lens of claim 18, wherein the contracted state of the zoom lens satisfies the relationship: 1 < cTTL/ImgH < 2.
20. The zoom lens of claim 18, wherein the first lens group moves in an object-side direction along an optical axis during switching of the zoom lens from the collapsed state to the wide-angle end.
21. The zoom lens of claim 17, wherein the first lens group moves toward the object side along the optical axis and the second lens group moves toward the object side along the optical axis during zooming of the zoom lens from the wide-angle end to the telephoto end.
22. The zoom lens according to claim 17, further comprising a diaphragm provided on an object side of the first lens group or an inside of the first lens group or an image side of the first lens group, the diaphragm moving following the first lens group during zooming.
23. The zoom lens according to claim 17, further comprising a third lens group fixedly disposed on an image side of the second lens group.
24. The zoom lens of claim 23, wherein the total number of lenses in the third lens group is 1-2.
25. The zoom lens according to any one of claims 17 to 24, wherein the total number of lenses in the first lens group is 3 to 5; and/or the total number of lenses in the second lens group is 2-4.
26. The zoom lens according to any one of claims 17 to 24, wherein the zoom lens satisfies the relation: 1 < fw/ImgH < 1.7, wherein fw is the wide-angle end focal length.
27. The zoom lens according to any one of claims 17 to 24, wherein the zoom lens satisfies the relation: -1 < f1/f2 < -0.5, wherein f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.
28. The zoom lens according to any one of claims 17 to 24, wherein the zoom lens satisfies the relation: 0.15 < Deltad/TTLt < 0.5, wherein Deltad is the distance that the first lens group moves during zooming of the zoom lens from the wide-angle end to the telephoto end.
29. The zoom lens according to any one of claims 17 to 24, wherein the zoom lens satisfies the relation: 1.5< tan (hFOVw)/tan (hfovit), wherein hFOVw is a half angle of view of the zoom lens at a wide angle end, and hFOVt is a half angle of view of the zoom lens at a telephoto end.
30. The zoom lens according to any one of claims 17 to 24, wherein the zoom lens satisfies the relation: fw/ENPw < 2.4, where fw is the focal length at the wide-angle end, ENPw is the entrance pupil diameter of the zoom lens at the wide-angle end.
31. A zoom lens according to any one of claims 17 to 24, wherein the lens on the most image side of the first lens group has positive optical power.
32. The zoom lens according to any one of claims 17 to 24, wherein the total number of lenses N in the zoom lens satisfies: n is more than or equal to 5 and less than or equal to 10.
33. A camera module comprising a photosensitive element and a zoom lens according to any one of claims 1 to 32, the zoom lens being movable in an optical axis direction relative to the photosensitive element.
34. An electronic device, wherein the electronic device comprises a device body and the camera module according to claim 33, the device body has an opening, the camera module is disposed in the device body corresponding to the opening, and a zoom lens of the camera module can extend or retract from the device body at least partially through the opening.