CN111123458A

CN111123458A - Optical lens, camera module and assembly method thereof

Info

Publication number: CN111123458A
Application number: CN201811283162.5A
Authority: CN
Inventors: 王明珠; 刘春梅; 田中武彦; 吴雨榕; 虞建中; 梅哲文
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2018-10-31
Filing date: 2018-10-31
Publication date: 2020-05-08
Anticipated expiration: 2038-10-31
Also published as: CN111123458B

Abstract

The present application provides an optical lens, comprising: a field curvature lens part including a field curvature lens group; a first lens part including a first lens group; and a second lens part including a second lens group, the The first lens group, the second lens group and the field curvature lens group together form an imageable optical system, and the first lens group is more sensitive to imaging sharpness than the field curvature lens group; wherein, The first lens group is located at the front end of the second lens group, and the second lens group is located at the front end of the field curvature lens group; a gap, and the curvature of field of the optical system is compensated by adjusting the first gap. The present application also provides a corresponding camera module and an assembling method of the optical lens and the camera module.

Description

Optical lens, camera module and assembling method thereof

Technical Field

The invention relates to the technical field of optical imaging, in particular to an optical lens, a camera module and an assembling method thereof.

Background

Along with the development of terminals such as mobile phones and computers, users have a great deal of improvement on various requirements, and particularly along with the development of mobile phones, the pursuit of users on shooting quality enables manufacturers to develop personalized and customized camera modules, such as large apertures and wide angles, lenses for solving the problem of a large number of lenses caused by aberration, and the like. This is on the one hand an increasing complexity in optical design and on the other hand the reality is that the complex optical system is sensitive, which poses a challenge to the yield of the manufacture and the quality of the product. For example, the compact development of mobile phones and the increase of the mobile phone screen occupation ratio make the space inside the mobile phone available for the front camera module smaller and smaller, and the market puts forward higher and higher demands on the imaging quality of the camera module.

In the field of compact camera modules (e.g., camera modules for mobile phones), the quality of the optical imaging lens and the manufacturing errors during the module packaging process often need to be considered. Specifically, in the manufacturing process of the optical imaging lens, factors affecting the lens resolving power come from errors in the respective elements and their assembly, errors in the thickness of the lens spacer elements, errors in the assembly fitting of the respective lenses, variations in the refractive index of the lens material, and the like. Because the factors influencing the resolution of the lens are very many and exist in a plurality of elements, the control of each factor has the limit of the manufacturing precision, if the precision of each element is simply improved, the improvement capability is limited, the improvement cost is high, and the increasingly improved imaging quality requirement of the market can not be met.

The applicant provides an assembling method for adjusting and determining the relative positions of an upper sub-lens and a lower sub-lens based on an active calibration process, and then bonding the upper sub-lens and the lower sub-lens together according to the determined relative positions so as to manufacture a complete optical lens or a camera module. The solution can improve the process capability index (CPK) of the optical lens or the camera module in mass production and improve the imaging quality.

Further, in the active calibration process, the evaluation of the imaging quality of the camera module is involved. The performance evaluation index of the camera module comprises the peak value of the resolving power and the field curvature of each view field position. The peak value of the analytic force represents the imaging definition degree of the selected field of view, and the field curvature is also called image surface field curvature and represents the consistency of the imaging definition positions of all the field of views and the imaging definition position of the central field of view. In one example, curvature of field may be defined as the deviation of the center point of the plane to which the imaging sharpness point location of the selected field of view is fitted from the ideal center position (note that this is not the only way to define curvature of field, e.g., curvature of field may sometimes be defined as the degree of tortuosity of the image plane to which the imaging sharpness point location of the selected field of view is fitted). When the peak value of the resolving power is qualified and the field curvature is poor, the whole field area cannot be clearly imaged at the same time; when the field curvature is qualified and the peak value is poor, the definition of the whole field area is uniform but not sufficient. It is desirable to have both field curvature peaks within acceptable ranges to achieve a product with better imaging quality.

The existing lens product based on active calibration can correct curvature of field in the active calibration process, however, the existing scheme only has the upper group adjustable relative to the lower group, and as the sensitivity of the displacement/rotation of the lenses of the upper group to the curvature of field is small, the lens needs to be adjusted to a better position of the curvature of field by larger displacement/rotation, so that more resolving power performance is sacrificed. Further, a long adjustment time is required or a qualified product cannot be obtained, which affects the production efficiency and the yield.

On the other hand, there is a technique for actively calibrating the gap between the lens and the photosensitive component in the prior art. Such active correction cannot adjust curvature of field. In other words, the curvature of field of the lens is fixed during assembly, and once a curvature defective product is assembled, the defective product cannot be corrected in the subsequent process, and the lens material is scrapped. In addition, the photosensitive assembly contains a photosensitive chip, and the photosensitive chip is mounted on the circuit board. During assembly, the thermal stress of baking or other mechanical stresses may also cause the curvature of the photo sensor chip to generate field curvature, that is, when the curvature of the lens material is within a qualified range, the lens material may be assembled with a semi-finished product of the chip (i.e., a photo sensor module) having a certain curvature of field, and the qualified lens material may also be assembled into a defective product.

Disclosure of Invention

The present invention aims to provide a solution that overcomes at least one of the drawbacks of the prior art.

According to an aspect of the present invention, there is provided an optical lens including: a field curvature lens component comprising a field curvature lens group comprising at least one lens; a first lens component comprising a first lens group comprising at least one lens; and a second lens component comprising a second lens group comprising at least one lens, the first lens group, the second lens group and the field curvature lens group together constituting an imageable optical system, the first lens group having a higher sensitivity to imaging sharpness than the field curvature lens group; wherein the first lens group is located at the front end of the second lens group, and the second lens group is located at the front end of the field curvature lens group; and a first gap is provided between the field curvature lens component and the second lens component, and the field curvature of the optical system is compensated by adjusting the first gap.

Wherein the first and second lens components are bonded together by a second glue, the field curvature lens component and the second lens component are bonded together by a first glue, the second glue after curing supports and fixes the first and second lens components such that the relative position between the first and second lens components remains at the relative position determined by active calibration; and the first rubber supports and fixes the field curvature lens component and the second lens component after curing so that a relative position between the field curvature lens component and the second lens component is maintained at a relative position determined by active calibration, wherein the active calibration is to adjust the relative positions of the first lens component and the second lens component and the relative position of the second lens component and the field curvature lens component based on an actual imaging result of the optical system.

Wherein at least a first optical lens and a second optical lens exist in the plurality of optical lenses under the same optical design, and the size of the first gap of the first optical lens in the optical axis direction of the optical lens is different from the size of the first gap of the second optical lens in the optical axis direction of the optical lens.

The second lens component further comprises a motor, the motor comprises a motor shell and a motor carrier, the motor carrier is movably connected with the motor shell, and the second lens group is mounted on the motor carrier; the first rubber material is positioned between the motor shell and the field curvature lens component.

Wherein the field curvature lens group has only one lens.

According to another aspect of the present application, there is also provided a camera module, including: at least one imaging lens component, wherein each said imaging lens component comprises an imaging lens group comprising at least one lens; the field curvature component comprises a photosensitive assembly and a field curvature lens group fixed on the photosensitive assembly, the field curvature lens group comprises at least one lens, and all the imaging lens groups and the field curvature lens group form an imaging optical system together; wherein the curvature of field component and the imaging lens component have a first gap therebetween, and the curvature of field of the optical system is compensated by adjusting the first gap.

Wherein the at least one imaging lens component comprises: a first lens component comprising a first lens group comprising at least one lens; and a second lens part including a second lens group including at least one lens, the first lens group, the second lens group and the field curvature lens group together constituting an imageable optical system, and the first lens group having a higher sensitivity to imaging sharpness than the field curvature lens group; wherein the curvature of field component and the imaging lens component are bonded by a first glue material arranged in the first gap, and the first glue material supports and fixes the curvature of field component and the imaging lens component after curing, so that a relative position between the curvature of field component and the imaging lens component is maintained at a relative position determined by active calibration; the first lens component and the second lens component are bonded together by a second glue material that, after curing, supports and secures the first lens component and the second lens component such that a relative position between the first lens component and the second lens component is maintained at a relative position determined by active calibration.

The size of the first gap of the first camera shooting module in the optical axis direction of the camera shooting module is different from the size of the first gap of the second camera shooting module in the optical axis direction of the camera shooting module.

The field curvature lens group is provided with only one lens, the first lens group is positioned at the front end of the second lens group, and the second lens group is positioned between the first lens group and the field curvature lens group.

The second lens component further comprises a motor, the motor comprises a motor shell and a motor carrier, the motor carrier is movably connected with the motor shell, and the second lens group is mounted on the motor carrier; the first rubber material is positioned between the motor shell and the field curvature component; and the first lens group comprises at least one variable focus liquid lens.

Wherein, the quantity of formation of image lens part is one, formation of image lens part is including still including the motor, the motor includes motor casing and motor carrier, the motor carrier with motor casing movably connects, formation of image lens part install in the motor carrier.

The photosensitive assembly comprises a photosensitive chip, and the actual imaging result is obtained according to image data output by the photosensitive chip.

Wherein, photosensitive assembly still includes: the photosensitive chip is arranged on the surface of the circuit board; the lens base is arranged or formed on the surface of the circuit board and surrounds the photosensitive chip; and a color filter mounted on the lens holder; wherein the field curvature lens group bears against a top surface of the base and/or a top surface of the color filter.

The field curvature component and the imaging lens component are bonded through a first rubber material arranged in the first gap, the first rubber material is located between the lens base and the motor shell, and the field curvature lens group and the motor carrier are separated from each other.

Wherein the field curvature lens group includes a microlens array.

According to another aspect of the present application, there is also provided an optical lens assembling method including: preparing a field curvature lens component and at least one imaging lens component, wherein the field curvature lens component and the imaging lens component are separated from each other, each of the imaging lens components comprises an imaging lens group, each of the imaging lens groups comprises at least one lens, the field curvature lens component comprises a field curvature lens group, and the field curvature lens group comprises at least one lens; pre-positioning the at least one imaging lens component and the field curvature lens component to enable the at least one imaging lens group and the field curvature lens group to jointly form an imaging optical system; actively calibrating the at least one imaging lens component and the field curvature lens component, wherein the relative positions of the at least one imaging lens component and the field curvature lens component are adjusted based on an actual imaging result of the optical system; wherein curvature of field of the optical system is compensated by adjusting a first gap between an imaging lens component and the curvature of field lens component; and connecting the at least one imaging lens component and the field curvature lens component to maintain the relative position of the at least one imaging lens component and the field curvature lens component in the relative position determined by active calibration.

Wherein, in the preparing step, the at least one imaging lens component comprises a first lens component and a second lens component, wherein the first lens component comprises a first lens group, and the first lens group comprises at least one lens; the second lens component comprises a second lens group comprising at least one lens; in the pre-positioning step, the first lens component, the second lens component and the field curvature lens component are pre-positioned, so that the first lens group, the second lens group and the field curvature lens group jointly form an imaging optical system; in the active calibration step, the active calibration is to adjust relative positions of the first lens part, the second lens part, and the field curvature lens part based on an actual imaging result of the optical system; and in the connecting step, the first lens part and the second lens part are bonded so that the relative positions of the first lens part and the second lens part are maintained at the relative positions determined by the active calibration, and the second lens part and the field curvature lens part are bonded so that the relative positions of the second lens part and the field curvature lens part are maintained at the relative positions determined by the active calibration.

Wherein in the preparing step, the first lens group has a higher sensitivity to imaging sharpness than the field curvature lens group; and in the active calibration step, the imaging definition of the optical system reaches the standard by adjusting the position of the first lens component, and the curvature of field of the optical system reaches the standard by adjusting the position of the curvature of field lens component.

In the active calibration step, the field curvature of the optical system is compensated by adjusting the distance between the field curvature lens component and the second lens component in the optical axis direction of the optical lens, so that the field curvature of the optical system reaches the standard.

Wherein, in the preparing step, the second lens component further comprises a motor, the motor comprises a motor housing and a motor carrier, the motor carrier is movably connected with the motor housing, the second lens group is mounted on the motor carrier, and the first lens group comprises at least one variable focus liquid lens; and in the connecting step, the second lens part is adhered to the field curvature lens part by adhering the motor housing to the field curvature lens part.

According to another aspect of the present application, there is also provided a camera module assembling method, including: preparing a field curvature element and at least one imaging lens element, wherein the field curvature element and the imaging lens element are separated from each other, each imaging lens element comprises an imaging lens group, each imaging lens group comprises at least one lens, the field curvature element comprises a photosensitive assembly and a field curvature lens group fixed on the photosensitive assembly, and the field curvature lens group comprises at least one lens; pre-positioning the at least one imaging lens component and the field curvature component to enable the imaging lens group and the field curvature lens group to jointly form an imaging optical system; performing active calibration on the at least one imaging lens component and the curvature of field component, wherein the active calibration is used for adjusting the relative positions of the at least one imaging lens component and the curvature of field component based on the actual imaging result of the optical system; wherein curvature of field of the optical system is compensated by adjusting a first gap between an imaging lens component and the curvature of field component; and connecting the at least one imaging lens component and the curvature of field component to maintain the relative position of the at least one imaging lens component and the curvature of field component at the relative position determined by active calibration.

Wherein, in the preparing step, the at least one imaging lens component comprises a first lens component and a second lens component, wherein the first lens component comprises a first lens group, and the first lens group comprises at least one lens; the second lens component comprises a second lens group comprising at least one lens; in the pre-positioning step, the first lens component, the second lens component and the field curvature component are pre-positioned, so that the first lens group, the second lens group and the field curvature lens group jointly form an imaging optical system; in the active calibration step, the active calibration is to adjust relative positions of the first lens component, the second lens component and the curvature of field component based on an actual imaging result of the optical system; and in the connecting step, the first lens component and the second lens component are bonded so that the relative positions of the first lens component and the second lens component are maintained at the relative positions determined by the active calibration, and the second lens component and the curvature of field component are bonded so that the relative positions of the second lens component and the curvature of field component are maintained at the relative positions determined by the active calibration.

Wherein in the preparing step, the first lens group has a higher sensitivity to imaging sharpness than the field curvature lens group; and in the active calibration step, the imaging definition of the optical system reaches the standard by adjusting the position of the first lens component, and the curvature of field of the optical system reaches the standard by adjusting the position of the curvature of field component.

In the active calibration step, the field curvature of the optical system is compensated by adjusting the distance between the field curvature component and the second lens component in the optical axis direction of the camera module, so that the field curvature of the optical system reaches the standard.

Wherein, in the preparing step, the second lens component further comprises a motor, the motor comprises a motor housing and a motor carrier, the motor carrier is movably connected with the motor housing, the second lens group is mounted on the motor carrier, and the first lens group comprises at least one variable focus liquid lens; and in the connecting step, the second lens part is bonded with the curvature of field part by bonding the motor shell with the curvature of field part.

In the preparation step, the field curvature component further comprises a motor, the motor comprises a motor shell and a motor carrier, and the motor carrier is movably connected with the motor shell; the preparing step further comprises: fixing the motor shell to the photosensitive assembly and/or the field curvature lens group, and keeping the field curvature lens group and the motor carrier in a state of being separated from each other; and in the connecting step, the second lens part is bonded with the motor carrier to realize the bonding of the second lens part and the curvature of field part.

In the preparation step, the field curvature component further comprises a motor, the motor comprises a motor shell and a motor carrier, and the motor carrier is movably connected with the motor shell; the preparing step further comprises: fixing the motor shell to the photosensitive assembly and/or the field curvature lens group, and keeping the field curvature lens group and the motor carrier in a state of being separated from each other; and in the connecting step, the imaging lens component is bonded with the motor carrier to realize the bonding of the imaging lens component and the curvature of field component.

In the preparation step, the field curvature lens component further comprises a motor, the motor comprises a motor shell and a motor carrier, and the motor carrier is movably connected with the motor shell; and in the connecting step, the second lens part is bonded to the field curvature lens part by bonding the second lens part to the motor carrier.

According to another aspect of the present application, there is also provided a camera module assembling method, including: assembling the optical lens according to any one of the optical lens assembling methods; and installing the optical lens on the photosensitive assembly to obtain a camera module.

Compared with the prior art, the invention has at least one of the following technical effects:

1. the invention can correct the field curvature of the defective products of the supplied materials in the process of assembling the camera module or the optical lens, thereby widening the allowed receiving range of the supplied materials.

2. The invention can compensate the field curvature caused by the bending of the chip (for example, the bending of the photosensitive chip caused by the baking thermal stress or other mechanical stresses) in the assembly process of the camera module, thereby improving the yield.

3. The invention can compensate field curvature and ensure that the resolution peak value is not degraded too much, thereby integrally improving the imaging quality.

Drawings

Exemplary embodiments are illustrated in referenced figures of the drawings. The embodiments and figures disclosed herein are to be regarded as illustrative rather than restrictive.

Fig. 1 shows an assembly schematic diagram of a camera module according to an embodiment of the invention;

fig. 2 shows an assembly diagram of a camera module according to another embodiment of the invention;

fig. 3 shows an assembly diagram of a camera module according to yet another embodiment of the invention;

FIG. 4 is a schematic assembly diagram of a camera module according to yet another embodiment of the invention;

FIG. 5 is a schematic assembly diagram of a camera module according to yet another embodiment of the invention;

FIG. 6 is a schematic view of an optical lens assembly when the field curvature lens component is formed of a single lens in an embodiment of the present application;

FIG. 7 is a schematic view of an optical lens assembly when the field curvature lens assembly includes a lens barrel according to another embodiment of the present application;

fig. 8 is an assembly diagram of a camera module in which a field curvature lens part is formed of a single lens according to an embodiment of the present application;

fig. 9 is an assembly view of a camera module in which a field curvature lens unit includes a lens barrel according to another embodiment of the present invention;

FIG. 10A illustrates a relative position adjustment in active calibration in one embodiment of the invention;

FIG. 10B illustrates rotational adjustment in active calibration of another embodiment of the present invention;

FIG. 10C illustrates a relative position adjustment with added v, w direction adjustment in active calibration according to yet another embodiment of the present invention.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that the expressions first, second, etc. in this specification are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, a first body discussed below may also be referred to as a second body without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "including," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

As used herein, the terms "substantially," "about," and the like are used as terms of table approximation and not as terms of table degree, and are intended to account for inherent deviations in measured or calculated values that will be recognized by those of ordinary skill in the art.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Fig. 1 shows an assembly diagram of a camera module according to an embodiment of the present invention. As shown in fig. 1, the camera module of the present embodiment includes: an imaging lens part 10, a curvature of field part 20, and a first glue (fig. 1 shows the imaging lens part 10 and the curvature of field part 20, respectively, but the first glue is not shown). The imaging lens assembly 10 includes an imaging lens group 11, and the imaging lens group 11 includes at least one lens (the imaging lens group 11 may be a single lens, or may be composed of a plurality of lenses). The field curvature component 20 includes a photosensitive assembly 21 and a field curvature lens group 22 fixed to the photosensitive assembly, where the field curvature lens group 22 includes at least one lens (the field curvature lens group may be a single lens sensitive to field curvature, or may be composed of a plurality of lenses sensitive to field curvature), the imaging lens group 11 and the field curvature lens group 22 together form an imageable optical system, and the field curvature sensitivity of the field curvature lens group may be higher than that of the imaging lens group (note that, in other embodiments of the present application, the field curvature sensitivity of the field curvature lens group may also be not higher than that of the imaging lens group, which will be further described below in conjunction with other embodiments). A first rubber material is arranged in a gap between the curvature of field member and the imaging lens member, and the first rubber material supports and fixes the curvature of field member and the imaging lens member after curing so that a relative position between the curvature of field member and the imaging lens member is maintained at a relative position determined by active calibration that adjusts the relative positions of the imaging lens member and the curvature of field member based on an actual imaging result of the optical system. The curvature of field sensitivity (sometimes also referred to as curvature of field sensitivity) of a lens or group of lenses can be determined by simulation of the extent to which manufacturing and assembly tolerances of the individual lenses affect the curvature of field (typically the curvature of field at a selected field of view). Sometimes, a lens purchased in the market directly provides a sensitivity analysis table, and the curvature of field sensitivity information of each lens or (lens group) can be directly obtained according to the sensitivity analysis table. Based on the curvature of field sensitivity information, it can be determined which lens or lenses form the curvature of field lens group and which lens or lenses form the imaging lens group in the designed optical system. The camera module that this embodiment provided can revise the field curvature of supplied materials defective products in the assembling process to the allowed acceptance range of supplied materials has been widened. In addition, the field curvature caused by the bending of the chip (for example, the bending of the photosensitive chip caused by the baking thermal stress or other mechanical stresses) can be compensated, so that the yield is improved.

It should be noted that in some other embodiments of the present application, the field curvature lens group may not be the lens group with the highest field curvature sensitivity in the camera module. For example, in one embodiment, the field curvature lens group may be the lens located at the lowest position (i.e. the rearmost position) in the optical design, and in the active calibration stage, the field curvature of the optical system may be adjusted by adjusting the distance between the lens and the imaging lens component in the direction of the optical axis (referring to the optical axis of the camera module), so as to compensate the field curvature. Wherein, only moving the field curvature lens group in the optical axis direction can realize the adjustment of the field curvature of the optical system, and simultaneously does not affect other imaging quality indexes (such as the imaging definition of the selected visual field) of the optical system. When the field curvature lens group is composed of a single lens, it is possible to directly fix the field curvature lens to the photosensitive element without providing a separate lens barrel for the field curvature member. Further, in one embodiment, the field curvature lens group may be composed of only a single field curvature lens, which may bear against the photosensitive assembly (e.g., may bear against a color filter of the photosensitive assembly). When the field curvature of the lens supplied materials can not reach the standard, the field curvature component (the field curvature component formed by directly fixing the field curvature lens on the photosensitive component) can be used for compensating the field curvature, so that the camera module product with the imaging quality reaching the standard is obtained.

In one embodiment, the first rubber is arranged in a first gap between the second lens component and the curvature of field component, and the first gap has a design dimension of at least 50 micrometers in an optical axis direction of the optical lens in optical design. Note that, since the active calibration adjusts the relative position between the components according to the actual imaging result, that is, adjusts the gap between the components (for example, the first gap) according to the actual imaging result, the size of the first gap may be different from the design size after the active calibration is completed. Further, in this embodiment, for the same batch of products under the same optical design, at least two optical lenses (or two camera modules) can be found, and the sizes of the first gaps of the two optical lenses (or the two camera modules) in the optical axis direction of the optical lenses are different. In other words, for the same batch of products under the same optical design, at least two optical lenses (or two camera modules) can be found, and the thicknesses (referring to the thicknesses in the optical axis direction) of the first glue materials of the two optical lenses (or the two camera modules) are different. Conversely, when the thicknesses (i.e., the thicknesses in the optical axis direction) of the first adhesive materials of the optical lenses (or the camera modules) in the same batch of products with the same optical design are different, the batch of products can be regarded as the products assembled after the active calibration of the first gap. In a product assembled after active calibration of the first gap, a first rubber material is arranged at the first gap between the curvature of field member and the imaging lens member (or a second lens member to be described later), and the first rubber material supports and fixes the curvature of field member and the imaging lens member (or a second lens member to be described later) after curing, so that a relative position between the curvature of field member and the imaging lens member (or a second lens member to be described later) is maintained at a relative position determined by active calibration. Further, still referring to fig. 1, in an embodiment of the present invention, the imaging lens component further includes a motor 12. The motor 12 includes a motor housing 12a and a motor carrier (note that the motor carrier is not shown in fig. 1), which is movably connected with the motor housing, for example, by a spring (also referred to as a reed). The motor carrier may be cylindrical, and the imaging lens part is mounted to the motor carrier. The camera module of the embodiment can further realize the functions based on the motor, such as automatic focusing, optical anti-shake and the like.

Further, still referring to fig. 1, in one embodiment of the present invention, the photosensitive assembly 21 includes a photosensitive chip 21a, a wiring board 21b, a mirror base 21c, and a color filter 21 d. The actual imaging result required by the active calibration is obtained according to the image data output by the photosensitive chip 21 a. The photosensitive chip 21a is mounted on the surface of the wiring board 21 b. The mirror base 21c is mounted or formed on the surface of the wiring board 21b and surrounds the photosensitive chip 21 a. The color filter 21d is attached to the mirror base 21 c. The field curvature lens group 22 bears against the top surface of the lens holder 21c and/or the top surface of the color filter 21 d. The active calibration is carried out between the imaging lens component and the curvature of field component with the photosensitive component. The first adhesive material may be located between the lens base 21c and the motor housing 12a, and the field curvature lens group 22 and the motor carrier are separated from each other. Here, the term "separated" means that the field curvature lens group and the motor carrier do not directly contact each other, and are not bonded to each other by a glue.

Fig. 2 shows an assembly diagram of a camera module according to another embodiment of the invention. In the present embodiment, the number of the imaging lens unit 10 is one, and the imaging lens unit 10 does not include a motor. The field curvature component 20 includes the motor 12. Specifically, the motor 12 includes a motor housing 12a and a motor carrier, which may be cylindrical, and is movably connected to the motor housing 12a, for example, by a spring 12b (also referred to as a spring, in one example, an upper spring and a lower spring may be provided for stability, and it is noted that only the upper spring is shown in fig. 2 as 12 b) to movably connect the motor carrier to the motor housing 12 a. The active calibration is performed between the imaging lens assembly and the curvature of field assembly with the motor and photosensitive assembly. The first rubber material is located between the motor carrier and the imaging lens component 10. In one example, the imaging lens assembly 10 may have a lens barrel through which a plurality of lenses are assembled together to constitute the imaging lens assembly 10. At this time, the first rubber material is located between the inner side surface of the motor carrier and the outer side surface of the lens barrel.

Fig. 3 shows an assembly diagram of a camera module according to yet another embodiment of the invention. In this embodiment, the camera module includes two imaging lens components, a field curvature component 20, a first plastic material and a second plastic material. The two imaging lens components are a first lens component 10a and a second lens component 10b, respectively. The first lens component 10a comprises a first lens group comprising at least one lens. The second lens part 10b includes a second lens group including at least one lens, the first lens group, the second lens group, and the field curvature lens group 22 together constitute an imageable optical system, and the first lens group has a higher sensitivity to an imaging sharpness than the field curvature lens group 22. A first rubber material is arranged in a gap between the curvature of field member 20 and the imaging lens member (a first rubber material is arranged in a gap between the curvature of field member 20 and the second lens member 10b in this embodiment), and the first rubber material supports and fixes the curvature of field member and the imaging lens member after curing so that the relative position between the curvature of field member and the imaging lens member is maintained at the relative position determined by active calibration that adjusts the relative positions of the imaging lens member and the curvature of field member based on an actual imaging result of the optical system. The first lens part 10a and the second lens part 10b are bonded together by a second glue material which, after curing, supports and fixes the first lens part and the second lens part such that the relative position between the first lens part and the second lens part is maintained at a relative position determined by active calibration. The sensitivity of a lens or group of lenses to imaging sharpness (sometimes referred to as sensitivity) can be determined by simulation of the degree to which manufacturing and assembly tolerances of each lens affect the imaging sharpness (typically the sharpness under a selected field of view). Sometimes, a lens purchased in the market directly provides a sensitivity analysis table, and the sensitivity information of each lens or (lens group) to the imaging definition can be directly obtained according to the sensitivity analysis table. Based on this information, it is possible to determine which lens or lenses have higher sensitivity to the imaging resolution and which lens or lenses have lower sensitivity to the imaging resolution in the designed optical system. In some embodiments, the imaging sharpness may be characterized by a resolution force peak (e.g., a peak of the MTF curve). In this embodiment, the camera module can revise the field curvature of supplied materials defective products in the assembling process to the allowed acceptance range of supplied materials has been widened. In addition, the field curvature caused by the bending of the chip (for example, the bending of the photosensitive chip caused by the baking thermal stress or other mechanical stresses) can be compensated, so that the yield is improved. Moreover, the field curvature is compensated, and meanwhile, the resolution force peak value is not degraded too much, so that the imaging quality is improved integrally.

Further, still referring to fig. 3, in an embodiment of the present invention, the second lens component further includes a motor 12, and the motor 12 includes a motor housing 12a and a motor carrier, and the motor carrier is movably connected to the motor housing 12a, for example, by a spring 12b (also referred to as a reed). The second lens group is mounted to the motor carrier. The first rubber material is located between the motor housing 12a and the field curvature component 20. The camera module of the embodiment can further realize the functions based on the motor, such as automatic focusing, optical anti-shake and the like.

Further, still referring to fig. 3, in an embodiment of the present invention, the first lens group includes at least one variable focus liquid lens, so as to form a zoom camera module. The liquid level shape of the liquid lens in the first lens part 10a can be electrically changed, and the second lens group is driven to move by the motor in the second lens part 10b, so that zooming is realized and the image plane is kept on the plane of the photosensitive chip. Thus, the zoom camera module of the embodiment can realize stepless zooming.

Further, in one embodiment, the field curvature lens group 22 may include a micro lens array, which may be fixed to the photosensitive assembly and implement the refocusing function by carrying a corresponding algorithm.

Further, still referring to fig. 3, in an embodiment of the invention, the first lens group is located at a front end of the second lens group, and the second lens group is located between the first lens group and the field curvature lens group. The front end refers to one end of the camera module or the optical lens close to the object space.

The optical devices described in the foregoing embodiments are all camera modules. According to other embodiments of the invention, corresponding optical lenses are also provided.

In one embodiment, the optical lens includes an imaging lens component and a field curvature lens component. The imaging lens component comprises an imaging lens group, and the imaging lens group comprises at least one lens. The field curvature lens component comprises a field curvature lens group, the field curvature lens group comprises at least one lens, and the imaging lens group and the field curvature lens group jointly form an imaging optical system. In this embodiment, the field curvature sensitivity of the field curvature lens group may be higher than that of the imaging lens group (note that, in other embodiments, the field curvature sensitivity of the field curvature lens group may not be higher than that of the imaging lens group). The optical lens further includes a first rubber material that is arranged in a gap between the field curvature lens part and the imaging lens part, and that supports and fixes the field curvature lens part and the imaging lens part after curing such that a relative position between the field curvature lens part and the imaging lens part is maintained at a relative position determined by active calibration that adjusts the relative position of the at least one imaging lens part and the field curvature lens part based on an actual imaging result of the optical system. The curvature of field sensitivity (sometimes also referred to as curvature of field sensitivity) of a lens or group of lenses can be determined by simulation of the extent to which manufacturing and assembly tolerances of the individual lenses affect the curvature of field (typically the curvature of field at a selected field of view). Sometimes, a lens purchased in the market directly provides a sensitivity analysis table, and the curvature of field sensitivity information of each lens or (lens group) can be directly obtained according to the sensitivity analysis table. Based on the curvature of field sensitivity information, it can be determined which lens or lenses form the curvature of field lens group and which lens or lenses form the imaging lens group in the designed optical system.

It should be noted that in some other embodiments of the present application, the field curvature lens group may not be the lens group with the highest field curvature sensitivity in the optical lens. For example, in one embodiment, the field curvature lens group may be a lens located at the lowest position (i.e. the rearmost position) in the optical design, and in the active calibration stage, the field curvature of the optical system may be adjusted by adjusting the distance between the lens and the imaging lens component in the optical axis direction (referring to the optical axis of the optical lens), so as to compensate the field curvature of the optical system. Wherein, only moving the field curvature lens group in the optical axis direction can realize the adjustment of the field curvature of the optical system, and simultaneously does not affect other imaging quality indexes (such as the imaging definition of the selected visual field) of the optical system.

Further, in one embodiment, in the optical lens, the number of the imaging lens components is two, and the two imaging lens components are a first lens component and a second lens component respectively. Wherein the first lens component comprises a first lens group comprising at least one lens. The second lens component comprises a second lens group, the second lens group comprises at least one lens, the first lens group, the second lens group and the field curvature lens group together form an imageable optical system, and the first lens group has higher sensitivity to imaging sharpness than the field curvature lens group. The first lens component and the second lens component are bonded together by a second glue material that, after curing, supports and secures the first lens component and the second lens component such that a relative position between the first lens component and the second lens component is maintained at a relative position determined by active calibration. The sensitivity of a lens or group of lenses to imaging sharpness (sometimes referred to as sensitivity) can be determined by simulation of the degree to which manufacturing and assembly tolerances of each lens affect the imaging sharpness (typically the sharpness under a selected field of view). Sometimes, a lens purchased in the market directly provides a sensitivity analysis table, and the sensitivity information of each lens or (lens group) to the imaging definition can be directly obtained according to the sensitivity analysis table. Based on this information, it is possible to determine which lens or lenses have higher sensitivity to the imaging resolution and which lens or lenses have lower sensitivity to the imaging resolution in the designed optical system. In some embodiments, the imaging sharpness may be characterized by the resolution force peaks (peaks of the MTF curve). Further, in one embodiment, the field curvature lens component may be composed of a single lens, and fig. 6 shows an optical lens assembly diagram when the field curvature lens component is composed of a single lens in one embodiment of the present application. In the present embodiment, the optical lens is assembled by the first lens part 10a, the second lens part 10b, and the field curvature lens part 20a through active alignment, wherein the field curvature lens part 20a may be composed of a single lens (the lens may be a bare lens without a lens barrel). Fig. 7 is a schematic view showing an assembly of an optical lens when a field curvature lens unit includes a lens barrel according to another embodiment of the present application. In the present embodiment, the field curvature lens part 20a may include a lens barrel and one or more lenses mounted in the lens barrel.

Fig. 8 is a schematic assembly diagram of a camera module in which a field curvature lens unit is formed of a single lens in one embodiment of the present application. Referring to fig. 8, the optical lens 100 (referred to as an assembled optical lens 100) of the embodiment of fig. 6 may be mounted in a motor carrier of a motor, and then a combination of the motor 12 and the optical lens 100 (which may be referred to as a motor lens assembly) is mounted on the photosensitive assembly 200, so as to obtain a dynamic focus camera module (e.g., an auto-focus camera module). Fig. 9 is an assembly diagram of a camera module in which a field curvature lens unit includes a lens barrel according to another embodiment of the present application. Referring to fig. 9, the optical lens 100 (referred to as an assembled optical lens 100) of the embodiment of fig. 7 may be mounted in a motor carrier of a motor, and then a combination of the motor 12 and the optical lens 100 (which may be referred to as a motor lens assembly) is mounted on the photosensitive assembly 200, so as to obtain a dynamic focus camera module (e.g., an auto-focus camera module).

Further, in one embodiment, in the optical lens assembly, the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected with the motor housing, and the second lens group is mounted on the motor carrier. The first rubber material is positioned between the motor shell and the field curvature lens component.

Further, in one embodiment, in the optical lens, the first lens group includes at least one variable focus liquid lens. In this embodiment, both the first lens part and the second lens part can zoom, thereby constituting a zoom optical lens. In the first lens component, the liquid surface shape of the liquid lens can be electrically changed, so that zooming or focusing can be realized. In the second lens component, the second lens group is driven by the motor to move, so that zooming or focusing is realized.

According to a series of embodiments of the invention, the invention also provides a camera module assembling method.

Referring to fig. 1, in an embodiment of the imaging lens group, the method for assembling the camera module includes steps S10 to S40 performed in sequence as follows.

Step S10, preparing a curvature of field component and at least one imaging lens component, wherein the curvature of field component and the imaging lens component are separated from each other, the imaging lens group comprises at least one lens, and the curvature of field component comprises a photosensitive assembly and a curvature of field lens group fixed on the photosensitive assembly.

Step S20, pre-positioning the at least one imaging lens component and the field curvature component, so that the imaging lens group and the field curvature lens group together form an imageable optical system. Wherein the pre-positioning may comprise: position and posture information of the imaging lens part and the curvature of field part are respectively obtained using a laser height measurement method or the like, and then adjusted to predetermined initial positions. The initial position here refers to the initial position of the active calibration. In other words, this step can be regarded as coarse adjustment of the positions of the imaging lens part and the curvature of field part.

And step S30, performing active calibration on the at least one imaging lens component and the curvature of field component, wherein the active calibration is to adjust the relative positions of the at least one imaging lens component and the curvature of field component based on the actual imaging result of the optical system, and the curvature of field of the optical system is compensated by adjusting the first gap between the imaging lens component and the curvature of field component. This step can be regarded as fine adjustment of the positions of the imaging lens part and the curvature of field part.

Step S40, bonding the at least one imaging lens component and the curvature of field component, so that the relative position of the at least one imaging lens component and the curvature of field component is maintained at the relative position determined by the active calibration. Bonding typically involves two substeps, painting and curing (i.e., curing the glue). The painting step may be performed before the active calibration or after the active calibration is completed.

And after the bonding is finished, the camera module based on active calibration can be obtained. In this embodiment, the camera module can revise the field curvature of supplied materials defective products in the assembling process to the allowed acceptance range of supplied materials has been widened. In addition, the field curvature caused by the bending of the chip (for example, the bending of the photosensitive chip caused by the baking thermal stress or other mechanical stresses) can be compensated, so that the yield is improved.

Further, referring to fig. 3, in one embodiment, in the step of preparing (i.e., step S10), the at least one imaging lens component includes a first lens component and a second lens component, wherein the first lens component includes a first lens group, and the first lens group includes at least one lens; the second lens component includes a second lens group including at least one lens. In the pre-positioning step (i.e., step S20), the first lens component, the second lens component, and the field curvature component are pre-positioned, so that the first lens group, the second lens group, and the field curvature lens group together form an imageable optical system. In the active calibration step (i.e., step S30), the active calibration is to adjust the relative positions of the first lens part, the second lens part, and the curvature of field part based on the actual imaging result of the optical system. In the bonding step (i.e., step S40), the first lens part and the second lens part are bonded so that the relative positions of the first lens part and the second lens part are maintained at the relative positions determined by the active calibration, and the second lens part and the curvature of field part are bonded so that the relative positions of the second lens part and the curvature of field part are maintained at the relative positions determined by the active calibration.

Further, still referring to fig. 3, in one embodiment, in the preparing step (i.e., step S10), the first lens group has a higher sensitivity to imaging sharpness than the field curvature lens group.

Further, still referring to fig. 3, in one embodiment, in the active calibration step (i.e., step S30), the first lens part is adjusted to make the imaging resolution of the optical system meet, and the field curvature part is adjusted to make the field curvature of the optical system meet (in another embodiment, the first lens part is adjusted to make the imaging resolution of the optical system meet, and then the field curvature part is adjusted to make the field curvature of the optical system meet). In this embodiment, the camera module can revise the field curvature of supplied materials defective products in the assembling process to the allowed acceptance range of supplied materials has been widened. In addition, the field curvature caused by the bending of the chip (for example, the bending of the photosensitive chip caused by the baking thermal stress or other mechanical stresses) can be compensated, so that the yield is improved. Moreover, the field curvature is compensated, and meanwhile, the resolution force peak value is not degraded too much, so that the imaging quality is improved integrally. In addition, the assembly of the camera module only needs to prepare three parts participating in active calibration, so that the process steps are simplified, and the yield is improved. Further, in one embodiment, in the active calibration step, curvature of field of the optical system may be compensated by adjusting a distance between the curvature of field component and the second lens component in the optical axis direction of the optical lens, so that the curvature of field of the optical system reaches a standard.

Further, still referring to fig. 3, in one embodiment, in the step of preparing (i.e., step S10), the second lens component further includes a motor including a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, the second lens group is mounted to the motor carrier, and the first lens group includes at least one variable focus liquid lens. In the bonding step (i.e., step S40), the bonding of the second lens part to the curvature of field part is achieved by bonding the motor housing to the curvature of field part.

Further, fig. 4 shows an assembly diagram of a camera module according to still another embodiment of the invention. Referring to fig. 4, in one embodiment, in the preparing step (i.e., step 10), the field curvature component 20 further includes a motor 12, and the motor 12 includes a motor housing 12a and a motor carrier movably connected to the motor housing. In this case, the imaging lens section may not have a motor (for example, the first lens section 10a and the second lens section 10b may not have a motor). The preparing step (i.e., step 10) further includes: the motor case 12a is fixed to the photosensitive member 21 and/or the field curvature lens group 22, and the field curvature lens group 22 and the motor carrier are kept in a state of being separated from each other. In the bonding step (i.e., step 40), the second lens part 10b is bonded to the curvature of field part 20 by bonding the second lens part 10b to the motor carrier (for example, the motor carrier may be cylindrical, and the second lens part 10b is bonded to the inner side surface of the cylindrical motor carrier).

Further, fig. 5 shows an assembly diagram of a camera module according to still another embodiment of the present invention. Referring to fig. 5, in one embodiment, in the preparing step (i.e., step 10), the field curvature component 20 further includes a motor 12, and the motor 12 includes a motor housing 12a and a motor carrier movably connected to the motor housing 12 a. The field curvature lens group 22 may be fixed to a motor housing, and the field curvature lens group 22 and the motor carrier may be maintained in a state of being separated from each other. In this case, the imaging lens section (for example, the first lens section 10a and the second lens section 10b may not have a motor) may not have a motor. The preparing step (i.e., step 10) further includes: the motor housing is fixed to the photosensitive member 21. In the bonding step (i.e., step 40), the bonding of the imaging lens component and the curvature of field component is achieved by bonding the imaging lens component and the motor carrier. In fig. 5, the number of the imaging lens components is 2, and the two imaging lens components are a first lens component 10a and a second lens component 10b, respectively. The bonding of the imaging lens component to the curvature of field component may be achieved by bonding the second lens component 10b to the motor carrier, and the first lens component 10a may be bonded to the second lens component 10 b. The adhesion of the second lens part 10b to the motor carrier may determine the relative position based on active calibration, as may the adhesion of the first lens part 10a to the second lens part 10 b.

Further, in some embodiments of the present invention, a corresponding optical lens assembly method is also provided.

The optical lens assembly includes the following steps S100 to S400 performed in sequence.

Step S100, preparing a field curvature lens component and at least one imaging lens component, where the field curvature lens component and the imaging lens component are separated from each other, each imaging lens component includes an imaging lens group, the imaging lens group includes at least one lens, and the field curvature lens component includes a field curvature lens group.

Step S200, pre-positioning the at least one imaging lens component and the field curvature lens component, so that the imaging lens group and the field curvature lens group together form an imageable optical system.

Step S300, performing active calibration on the at least one imaging lens component and the field curvature lens component, where the active calibration is to adjust the relative positions of the at least one imaging lens component and the field curvature lens component based on the actual imaging result of the optical system, and the field curvature of the optical system is compensated by adjusting a first gap between the imaging lens component and the field curvature lens component.

Step S400, adhering the at least one imaging lens component and the field curvature lens component to keep the relative position of the at least one imaging lens component and the field curvature lens component at the determined relative position for active calibration.

Further, in the step of preparing (i.e., step S100), the at least one imaging lens component includes a first lens component and a second lens component, wherein the first lens component includes a first lens group, and the first lens group includes at least one lens; the second lens component includes a second lens group including at least one lens. In the pre-positioning step (i.e., step S200), the first lens component, the second lens component and the field curvature lens component are pre-positioned, so that the first lens group, the second lens group and the field curvature lens group together form an imageable optical system. In the active calibration step (i.e., step S300), the active calibration is to adjust the relative positions of the first lens part, the second lens part, and the field curvature lens part based on the actual imaging result of the optical system. In the bonding step (i.e., step S400), the first lens part and the second lens part are bonded so that the relative positions of the first lens part and the second lens part are maintained at the relative positions determined by the active calibration, and the second lens part and the field curvature lens part are bonded so that the relative positions of the second lens part and the field curvature lens part are maintained at the relative positions determined by the active calibration.

Further, in one embodiment, in the preparing step (i.e., step S100), the first lens group has a higher sensitivity to imaging sharpness than the field curvature lens group. In the active calibration step (i.e., step S300), the position of the first lens component is adjusted to make the imaging sharpness of the optical system meet the standard, and then the position of the field curvature lens component is adjusted to make the field curvature of the optical system meet the standard. Further, in one embodiment, in the active calibration step, curvature of field of the optical system may be compensated by adjusting a distance between the curvature of field lens component and the second lens component in an optical axis direction of the optical lens, so that the curvature of field of the optical system reaches a standard.

Further, in one embodiment, in the step of preparing (i.e., step S100), the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected with the motor housing, the second lens group is mounted on the motor carrier, and the first lens group includes at least one variable focus liquid lens. In the bonding step (i.e., step S400), the bonding of the second lens part to the field curvature lens part is achieved by bonding the motor housing to the field curvature lens part.

Further, referring to fig. 5, in one embodiment, in the step of preparing (i.e., step S100), the field curvature lens component further includes a motor, and the motor includes a motor housing and a motor carrier, and the motor carrier is movably connected to the motor housing. In this case, the second lens component may not include a motor. In the bonding step (i.e., step S400), the bonding of the second lens part to the field curvature lens part is achieved by bonding the second lens part to the motor carrier. Further, the field curvature lens component is bonded with (or otherwise mounted on) the photosensitive assembly, so that a camera module can be obtained.

It is noted that in the above embodiments, the bonding step may be replaced by other types of joining steps such as laser welding. In other words, in the present application, any bonding process may be used instead of the bonding process as long as the bonding process can maintain the relative positions of the at least one imaging lens component and the field curvature lens component (or the field curvature component) at the relative positions determined by the active calibration.

The active calibration process used in the method for assembling an optical lens or a camera module will be further described below. When the number of parts prepared by the preparation step is three or more, active calibration is required at a plurality of gaps between the plurality of parts, and the active calibration at the plurality of gaps may be performed simultaneously. For example, in one embodiment, the active calibration between the first lens component and the second lens component, and the active calibration between the second lens component and the curvature of field lens component (or curvature of field component) may be synchronized. For the sake of brevity, the following description will be given taking active calibration between the first lens part and the second lens part as an example.

The active calibration described herein may adjust the relative positions of the first and second lens components in multiple degrees of freedom. FIG. 10A illustrates a relative position adjustment in active calibration in one embodiment of the invention. In this adjustment manner, the first lens part (which may also be a first lens) may move in the x, y, z directions relative to the second lens part (i.e., the relative position adjustment in this embodiment has three degrees of freedom). Where the z-direction is the direction along the optical axis and the x, y-directions are the directions perpendicular to the optical axis. The x, y directions both lie in a tuning plane P within which translation can be resolved into two components in the x, y directions.

FIG. 10B illustrates rotational adjustment in active calibration according to another embodiment of the present invention. In this embodiment, the relative position adjustment has an increased rotational degree of freedom, i.e., adjustment in the r direction, in addition to the three degrees of freedom of fig. 10A. In the present embodiment, the adjustment in the r direction is a rotation in the adjustment plane P, i.e. a rotation around an axis perpendicular to the adjustment plane P.

Further, fig. 10C shows a relative position adjustment manner with v and w direction adjustments added in the active calibration according to yet another embodiment of the present invention. Where the v direction represents the rotation angle of the xoz plane, the w direction represents the rotation angle of the yoz plane, and the rotation angles of the v direction and the w direction may be combined into a vector angle representing the total tilt state. That is, by the v-direction and w-direction adjustment, the tilt posture of the first lens component with respect to the second lens component (i.e., the tilt of the optical axis of the first lens component with respect to the optical axis of the second lens component) can be adjusted.

The adjustment of the above-mentioned six degrees of freedom x, y, z, r, v, and w may affect the imaging quality of the optical system (e.g., affect the magnitude of the resolution). In other embodiments of the present invention, the relative position adjustment may be performed by adjusting only any one of the six degrees of freedom, or by a combination of any two or more of the six degrees of freedom.

Further, in an embodiment, in the active calibration step, the adjustment of the relative position of the first lens component and the second lens component comprises a translation in said adjustment plane, i.e. a movement in the x, y direction.

Further, in one embodiment, in the active calibration step, the adjusting of the relative positions of the first lens component and the second lens component further includes: and adjusting and determining an included angle of the axis of the first lens component relative to the axis of the second lens component, namely adjustment in the w and v directions according to the actually measured resolution force of the optical system. In the assembled optical lens or camera module, an included angle between the axis of the first lens component and the axis of the second lens component may be different from zero.

Further, in one embodiment, in the active calibration step, the adjusting of the relative positions of the first lens component and the second lens component further includes: moving the first lens part in a direction perpendicular to the adjustment plane (i.e. adjustment in z-direction), determining a relative position between the first lens part and the second lens part in the direction perpendicular to the adjustment plane based on a measured resolution of the optical system.

Further, in one embodiment, the first lens component may not have a first barrel. For example, the first lens component may be constituted by a single first lens. Before active calibration, pre-positioning correspondingly to ensure that a gap is reserved between the bottom surface of the first lens and the top surface of the second lens component; and then carrying out active calibration, arranging the rubber material in the gap and solidifying the rubber material. In this embodiment, the first lens may be formed by a plurality of sub-lenses which are integrally formed by being fitted or bonded to each other. In this embodiment, the side surfaces and the top surface of the non-optical surface of the first lens not used for imaging may be formed with a light shielding layer. The light shielding layer may be formed by screen printing a light shielding material on the side surfaces and the top surface of the first lens.

In one embodiment, in the active calibration step, the second lens component may be fixed, the first lens component may be held by a clamp, and the first lens component may be moved by a six-axis movement mechanism connected to the clamp, so as to realize the relative movement between the first lens component and the second lens component in the above six degrees of freedom. The clamp can be supported against or partially supported against the side surface of the first lens component, so that the first lens component is clamped and position adjustment with multiple degrees of freedom is performed.

In the above embodiment, the actual imaging result of the optical system composed of a plurality of lens groups can be obtained according to the image data output by the photosensitive chip. In the active calibration technology, a target can be arranged on an object space, the photosensitive assembly is electrified, the photosensitive assembly directly outputs image data for imaging the target, the resolution data of the calibrated optical system can be obtained based on the image data, and whether the imaging quality reaches the standard or not is further judged.

The above description is only a preferred embodiment of the present application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. An optical lens, comprising:

a field curvature lens component comprising a field curvature lens group comprising at least one lens;

a first lens component comprising a first lens group comprising at least one lens; and

a second lens component comprising a second lens group comprising at least one lens, the first lens group, the second lens group and the field curvature lens group together constituting an imageable optical system, the first lens group having a higher sensitivity to imaging sharpness than the field curvature lens group;

wherein the first lens group is located at the front end of the second lens group, and the second lens group is located at the front end of the field curvature lens group; and

the curvature of field lens component and the second lens component have a first gap therebetween, and the curvature of field of the optical system is compensated by adjusting the first gap.

2. An optical lens assembly as recited in claim 1, wherein the first lens component and the second lens component are bonded together by a second glue, the field curvature lens component and the second lens component being bonded together by a first glue, the second glue supporting and securing the first lens component and the second lens component after curing such that the relative position between the first lens component and the second lens component is maintained at the relative position determined by the active calibration; and the first rubber supports and fixes the field curvature lens component and the second lens component after curing so that a relative position between the field curvature lens component and the second lens component is maintained at a relative position determined by active calibration, wherein the active calibration is to adjust the relative positions of the first lens component and the second lens component and the relative position of the second lens component and the field curvature lens component based on an actual imaging result of the optical system.

3. An optical lens according to claim 1, characterized in that there are at least a first optical lens and a second optical lens in a plurality of the optical lenses under the same optical design, and a size of the first gap of the first optical lens in an optical axis direction of the optical lens is different from a size of the first gap of the second optical lens in the optical axis direction of the optical lens.

4. An optical lens assembly as recited in claim 2, wherein the second lens component further comprises a motor including a motor housing and a motor carrier, the motor carrier being movably coupled to the motor housing, the second lens group being mounted to the motor carrier; the first rubber material is positioned between the motor shell and the field curvature lens component.

5. An optical lens according to claim 4, characterized in that the field curvature lens group has only one lens.

6. The module of making a video recording, its characterized in that includes:

at least one imaging lens component, wherein each said imaging lens component comprises an imaging lens group comprising at least one lens; and

the field curvature component comprises a photosensitive assembly and a field curvature lens group fixed on the photosensitive assembly, the field curvature lens group comprises at least one lens, and all the imaging lens groups and the field curvature lens group form an imaging optical system together;

wherein the curvature of field component and the imaging lens component have a first gap therebetween, and the curvature of field of the optical system is compensated by adjusting the first gap.

7. The camera module of claim 6, wherein the at least one imaging lens component comprises:

a second lens part including a second lens group including at least one lens, the first lens group, the second lens group, and the field curvature lens group together constituting an imageable optical system, and the first lens group being more sensitive to an imaging sharpness than the field curvature lens group;

wherein the curvature of field component and the imaging lens component are bonded by a first glue material arranged in the first gap, and the first glue material supports and fixes the curvature of field component and the imaging lens component after curing, so that a relative position between the curvature of field component and the imaging lens component is maintained at a relative position determined by active calibration; the first lens component and the second lens component are bonded together by a second glue material that, after curing, supports and secures the first lens component and the second lens component such that a relative position between the first lens component and the second lens component is maintained at a relative position determined by active calibration.

8. The camera module according to claim 6 or 7, wherein at least a first camera module and a second camera module exist among the plurality of camera modules under the same optical design, and a size of the first gap of the first camera module in an optical axis direction of the camera module is different from a size of the first gap of the second camera module in the optical axis direction of the camera module.

9. The camera module of claim 7, wherein the field curvature lens group has only one lens, the first lens group is located at a front end of the second lens group, and the second lens group is located between the first lens group and the field curvature lens group.

10. The camera module of claim 7, wherein the second lens component further comprises a motor, the motor comprising a motor housing and a motor carrier, the motor carrier being movably coupled to the motor housing, the second lens group being mounted to the motor carrier; the first rubber material is positioned between the motor shell and the field curvature component; and the first lens group comprises at least one variable focus liquid lens.

11. The camera module of claim 6, wherein the number of the imaging lens assembly is one, the imaging lens assembly further comprising a motor, the motor comprising a motor housing and a motor carrier, the motor carrier being movably coupled to the motor housing, the imaging lens assembly being mounted to the motor carrier.

12. The camera module according to claim 6, wherein the photosensitive assembly comprises a photosensitive chip, and the actual imaging result is obtained according to image data output by the photosensitive chip.

13. The camera module of claim 12, wherein the photosensitive assembly further comprises:

the photosensitive chip is arranged on the surface of the circuit board;

the lens base is arranged or formed on the surface of the circuit board and surrounds the photosensitive chip; and

a color filter mounted on the lens holder;

wherein the field curvature lens group bears against a top surface of the base and/or a top surface of the color filter.

14. The camera module of claim 13, wherein the field curvature component and the imaging lens component are bonded by a first glue disposed in the first gap, the first glue being located between the lens mount and the motor housing, the field curvature lens group and the motor carrier being separated from each other.

15. The camera module of claim 9, wherein the field curvature lens group comprises a micro lens array.

16. An optical lens assembly method, comprising:

preparing a field curvature lens component and at least one imaging lens component, wherein the field curvature lens component and the imaging lens component are separated from each other, each of the imaging lens components comprises an imaging lens group, each of the imaging lens groups comprises at least one lens, the field curvature lens component comprises a field curvature lens group, and the field curvature lens group comprises at least one lens;

pre-positioning the at least one imaging lens component and the field curvature lens component to enable the at least one imaging lens group and the field curvature lens group to jointly form an imaging optical system;

actively calibrating the at least one imaging lens component and the field curvature lens component, wherein the relative positions of the at least one imaging lens component and the field curvature lens component are adjusted based on an actual imaging result of the optical system; wherein curvature of field of the optical system is compensated by adjusting a first gap between an imaging lens component and the curvature of field lens component; and

and connecting the at least one imaging lens component and the field curvature lens component to keep the relative position of the at least one imaging lens component and the field curvature lens component in the determined relative position by active calibration.

17. An optical lens assembly method according to claim 16, wherein in the preparing step, the at least one imaging lens component comprises a first lens component and a second lens component, wherein the first lens component comprises a first lens group comprising at least one lens; the second lens component comprises a second lens group comprising at least one lens;

in the pre-positioning step, the first lens component, the second lens component and the field curvature lens component are pre-positioned, so that the first lens group, the second lens group and the field curvature lens group jointly form an imaging optical system;

in the active calibration step, the active calibration is to adjust relative positions of the first lens part, the second lens part, and the field curvature lens part based on an actual imaging result of the optical system; and

in the connecting step, the first lens part and the second lens part are bonded so that the relative positions of the first lens part and the second lens part are maintained at the relative positions determined by the active calibration, and the second lens part and the field curvature lens part are bonded so that the relative positions of the second lens part and the field curvature lens part are maintained at the relative positions determined by the active calibration.

18. An optical lens assembly method according to claim 17, wherein in the preparing step, the first lens group is more sensitive to imaging sharpness than the field curvature lens group; and

in the active calibration step, the imaging definition of the optical system reaches the standard by adjusting the position of the first lens component, and the curvature of field of the optical system reaches the standard by adjusting the position of the curvature of field lens component.

19. An optical lens assembling method according to claim 18, wherein in the active calibration step, curvature of field of the optical system is compensated by adjusting a distance between the curvature of field lens component and the second lens component in an optical axis direction of the optical lens so that the curvature of field of the optical system reaches a standard.

20. An optical lens assembly method as recited in claim 17, wherein in the preparing step, the second lens component further includes a motor including a motor housing and a motor carrier, the motor carrier being movably coupled to the motor housing, the second lens group being mounted to the motor carrier, and the first lens group including at least one variable focus liquid lens; and

in the connecting step, the second lens part is bonded to the field curvature lens part by bonding the motor housing to the field curvature lens part.

21. The camera module assembling method is characterized by comprising the following steps:

preparing a field curvature element and at least one imaging lens element, wherein the field curvature element and the imaging lens element are separated from each other, each imaging lens element comprises an imaging lens group, each imaging lens group comprises at least one lens, the field curvature element comprises a photosensitive assembly and a field curvature lens group fixed on the photosensitive assembly, and the field curvature lens group comprises at least one lens;

pre-positioning the at least one imaging lens component and the field curvature component to enable the imaging lens group and the field curvature lens group to jointly form an imaging optical system;

performing active calibration on the at least one imaging lens component and the curvature of field component, wherein the active calibration is used for adjusting the relative positions of the at least one imaging lens component and the curvature of field component based on the actual imaging result of the optical system; wherein curvature of field of the optical system is compensated by adjusting a first gap between an imaging lens component and the curvature of field component; and

and connecting the at least one imaging lens component and the curvature of field component to keep the relative position of the at least one imaging lens component and the curvature of field component in the determined relative position by active calibration.

22. The camera module assembly method of claim 21, wherein in the preparing step, the at least one imaging lens component comprises a first lens component and a second lens component, wherein the first lens component comprises a first lens group comprising at least one lens; the second lens component comprises a second lens group comprising at least one lens;

in the pre-positioning step, the first lens component, the second lens component and the field curvature component are pre-positioned, so that the first lens group, the second lens group and the field curvature lens group jointly form an imaging optical system;

in the active calibration step, the active calibration is to adjust relative positions of the first lens component, the second lens component and the curvature of field component based on an actual imaging result of the optical system; and

in the connecting step, the first lens component and the second lens component are bonded so that the relative positions of the first lens component and the second lens component are maintained at the relative positions determined by the active calibration, and the second lens component and the curvature of field component are bonded so that the relative positions of the second lens component and the curvature of field component are maintained at the relative positions determined by the active calibration.

23. The camera module assembly method of claim 22, wherein in the preparing step, the first lens group is more sensitive to imaging sharpness than the field curvature lens group; and

in the active calibration step, the imaging definition of the optical system reaches the standard by adjusting the position of the first lens component, and the curvature of field of the optical system reaches the standard by adjusting the position of the curvature of field component.

24. The camera module assembly method of claim 23, wherein in the active calibration step, the curvature of field of the optical system is compensated by adjusting a distance between the curvature of field component and the second lens component in an optical axis direction of the camera module, so that the curvature of field of the optical system reaches a standard.

25. The camera module assembly method of claim 23, wherein in the preparing step, the second lens member further comprises a motor, the motor comprising a motor housing and a motor carrier, the motor carrier being movably coupled to the motor housing, the second lens group being mounted to the motor carrier, and the first lens group comprising at least one variable focus liquid lens; and

in the connecting step, the second lens component is bonded to the curvature of field component by bonding the motor housing to the curvature of field component.

26. The camera module assembly method of claim 23, wherein in the preparing step, the field curvature component further comprises a motor, the motor comprises a motor housing and a motor carrier, and the motor carrier is movably connected with the motor housing;

the preparing step further comprises: fixing the motor shell to the photosensitive assembly and/or the field curvature lens group, and keeping the field curvature lens group and the motor carrier in a state of being separated from each other; and

in the connecting step, the second lens part is bonded to the curvature of field part by bonding the second lens part to the motor carrier.

27. The camera module assembly method of claim 21, wherein in the preparing step, the field curvature component further comprises a motor, the motor comprises a motor housing and a motor carrier, and the motor carrier is movably connected with the motor housing;

in the connecting step, the bonding of the imaging lens component and the curvature of field component is realized by bonding the imaging lens component and the motor carrier.

28. The camera module assembly method of claim 23, wherein in the preparing step, the field curvature lens component further comprises a motor, the motor comprising a motor housing and a motor carrier, the motor carrier being movably connected to the motor housing; and in the connecting step, the second lens part is bonded to the field curvature lens part by bonding the second lens part to the motor carrier.

29. The camera module assembling method is characterized by comprising the following steps:

assembling an optical lens according to the optical lens assembling method of any one of claims 16 to 19; and

and installing the optical lens on the photosensitive assembly to obtain a camera module.