CN114527553A - Optical lens, camera module and electronic equipment - Google Patents

Abstract

The invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens with positive focal power, which is arranged in sequence from an object side to an image side along an optical axis, and the object side surface and the image side surface of the first lens are convex surfaces at a position close to the optical axis; a focusing structure; a second lens having an optical power; a third lens element with negative power having a concave object-side surface and a convex image-side surface at the paraxial region; a fourth lens element with positive optical power having a concave object-side surface at paraxial region and a convex image-side surface at paraxial region; the fifth lens element with negative power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region. By adopting the optical lens, the camera module and the electronic equipment provided by the invention, the design requirements of small distortion and quick focusing can be realized, and the imaging quality is improved.

Description

Optical lens, camera module and electronic equipment

technical field

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

Background technique

With the continuous improvement of people's pursuit of the imaging quality of cameras, optical lenses with wide vision, small distortion and fast focusing have become a major trend in the improvement of optical lens technology. However, in the related art, how to realize the characteristics of small distortion and fast focusing of the optical lens, thereby improving the imaging quality of the optical lens, is still a technical problem that needs to be solved urgently.

SUMMARY OF THE INVENTION

The embodiment of the invention discloses an optical lens, a camera module and an electronic device, which can meet the design requirements of small distortion and fast focusing of the optical lens, and improve the imaging quality of the optical lens.

In order to achieve the above object, in a first aspect, the present invention discloses an optical lens, the optical lens includes a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side to the image side along the optical axis and the fifth lens;

The first lens has a positive refractive power, and both the object side and the image side of the first lens are convex at the near optical axis;

the second lens has optical power;

The third lens has a negative refractive power, the object side of the third lens is concave at the near optical axis, and the image side of the third lens is convex at the near optical axis;

The fourth lens has a positive refractive power, the object side of the fourth lens is concave at the near optical axis, and the image side of the fourth lens is convex at the near optical axis;

The fifth lens has negative refractive power, the object side of the fifth lens is convex at the near optical axis, and the image side of the fifth lens is concave at the near optical axis;

The optical lens further includes a focus adjustment structure, and the focus adjustment structure is disposed between the first lens and the second lens, and has an air gap between the first lens and the second lens.

In a second aspect, the present invention discloses a camera module, the camera module includes an image sensor and the optical lens according to the first aspect above, and the image sensor is disposed on the image side of the optical lens. The camera module with the optical lens of the first aspect can meet the design requirements of small distortion and fast focusing of the camera module, and improve the imaging quality of the camera module.

In a third aspect, the present invention discloses an electronic device, the electronic device includes a casing and the camera module according to the second aspect above, wherein the camera module is disposed on the casing. The electronic device with the camera module can meet the design requirements of small distortion and fast focusing of the electronic device, and improve the imaging quality of the electronic device.

Compared with the prior art, the beneficial effects of the present invention are:

In the optical lens, the camera module, and the electronic equipment provided by the embodiments of the present invention, the optical lens adopts a first lens with positive optical power, and the object side and the image side of the first lens are convex at the near optical axis, which is beneficial to The light entering the optical lens is concentrated, thereby expanding the field of view of the optical lens. The second lens has a refractive power, which is beneficial to increase the height of the light, so that the light is incident at a larger angle, which provides the possibility for a large image plane height. The third lens has optical power, and the object side of the third lens is concave at the near optical axis, and the image side of the third lens is convex at the near optical axis, which can effectively balance the optical path difference of the optical lens and realize the correction field. The design requirements of curved and smooth outer field of view distortion are beneficial to reduce the distortion generated by the optical lens. The fourth lens has a positive refractive power, and the object side of the fourth lens is concave at the near optical axis, and the image side of the fourth lens is convex at the near optical axis, which can help to expand the field of view of the optical lens and reduce the Distortion from small optics. The fifth lens has a negative refractive power, and the object side of the fifth lens is convex at the near optical axis, and the image side of the fifth lens is concave at the near optical axis, which can correct the first lens to the fourth lens. The aberration of the optical lens promotes the aberration balance of the optical lens, thereby improving the resolution of the optical lens, thereby improving the imaging quality of the optical lens. At the same time, the height of the light can also be increased, so that the light can transition to the imaging surface more smoothly and meet the design requirements of the large image surface of the optical lens. The optical lens of the present application is further provided with a focusing structure between the first lens and the second lens, and the focusing structure can quickly adjust the focal length according to different shooting states, thereby controlling the change amount of the focal power of the focusing structure, and realizing the automatic adjustment of the optical lens. The focusing function is conducive to realizing the rapid focusing effect of the optical lens while meeting the requirements of miniaturization design, thereby improving the imaging quality of the optical lens. In addition, the focusing structure is arranged between the first lens and the second lens, that is, the focusing structure is arranged in front. Considering that the light enters from the first lens and exits from the fifth lens to the imaging surface, the closer it is to the imaging surface, The larger the size of the lens. Therefore, compared with the way of placing the focusing structure in the middle or the rear, placing the focusing structure in front can make the structure size relatively small, so that the overall size of the optical lens can be reduced; when the optical lens is applied to the camera When the module is used, thanks to the relatively small circumferential size of the front end of the lens, the front focusing structure can obtain sufficient wiring space, which provides a strong support for the power supply of the focusing structure. In addition, since the diaphragm is arranged on the object side of the first lens, the focusing structure is arranged between the first lens and the second lens, so as to be far away from the diaphragm, reducing the distance between the focusing structure and the first lens and the second lens. installation sensitivity. However, there is an air gap between the focusing structure and the first lens and the second lens, which can provide space for the deformation of the object side of the focusing structure, so that the focusing structure and the lenses before and after it (ie, the first lens and the second lens) The surface shapes are relatively close, so that the focusing structure can better match the first lens and the second lens.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of an optical lens disclosed in Embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of the bending degree of the focusing structure disclosed in the first embodiment of the present invention under the condition of no voltage action;

3 is a schematic diagram of the bending degree of the focusing structure disclosed in the first embodiment of the present invention under the action of a voltage of 10V;

4 is a schematic diagram of the bending degree of the focusing structure disclosed in the first embodiment of the present invention under the action of a voltage of 30V;

5 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the first embodiment of the present invention in a close-focus state;

6 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the first embodiment of the present invention in a medium focus state;

7 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the first embodiment of the present invention in a telefocal state;

8 is a schematic structural diagram of an optical lens disclosed in Embodiment 2 of the present invention;

9 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the second embodiment of the present invention in a near-focus state;

10 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the second embodiment of the present invention in a medium focus state;

11 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the second embodiment of the present invention in a telefocal state;

12 is a schematic structural diagram of an optical lens disclosed in Embodiment 3 of the present invention;

13 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the third embodiment of the present invention in a close-focus state;

14 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the third embodiment of the present invention in a medium focus state;

15 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the third embodiment of the present invention in a telefocal state;

16 is a schematic structural diagram of an optical lens disclosed in Embodiment 4 of the present invention;

17 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the fourth embodiment of the present invention in a close-focus state;

18 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the fourth embodiment of the present invention in a medium focus state;

19 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the fourth embodiment of the present invention in a telefocal state;

20 is a schematic structural diagram of an optical lens disclosed in Embodiment 5 of the present invention;

21 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the fifth embodiment of the present invention in a close-focus state;

22 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the fifth embodiment of the present invention in a medium focus state;

23 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the fifth embodiment of the present invention in a telefocal state;

24 is a schematic structural diagram of an optical lens disclosed in Embodiment 6 of the present invention;

25 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the sixth embodiment of the present invention in a near-focus state;

26 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the sixth embodiment of the present invention in a medium focus state;

27 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the sixth embodiment of the present invention in a telefocal state;

28 is a schematic structural diagram of a camera module disclosed in the present invention;

FIG. 29 is a schematic structural diagram of the electronic device disclosed in the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", The orientation or positional relationship indicated by "vertical", "horizontal", "horizontal", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are primarily used to better describe the invention and its embodiments, and are not intended to limit the fact that the indicated device, element or component must have a particular orientation, or be constructed and operated in a particular orientation.

In addition, some of the above-mentioned terms may be used to express other meanings besides orientation or positional relationship. For example, the term "on" may also be used to express a certain attachment or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific situations.

Furthermore, the terms "installed", "arranged", "provided", "connected", "connected" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or a unitary structure; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediary, or between two devices, elements, or components. internal communication. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and configurations may be the same or different), and are not used to indicate or imply the indicated devices, elements, etc. or the relative importance and number of components. Unless stated otherwise, "plurality" means two or more.

The technical solutions of the present invention will be further described below with reference to the embodiments and the accompanying drawings.

Referring to FIG. 1 , according to a first aspect of the present invention, the present invention discloses an optical lens 100 . The optical lens 100 includes a first lens L1 and a focusing structure 60 that are sequentially arranged along the optical axis O from the object side to the image side. , a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5. During imaging, the light enters the first lens L1, the focusing structure 60, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 in sequence from the object side of the first lens L1 and is finally imaged on the optical lens 100 on the imaging plane 101. The first lens L1 has negative refractive power, the second lens L2 has negative refractive power or positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, and the fifth lens L5 has Negative power.

Further, the object side 11 and the image side 12 of the first lens L1 are convex surfaces at the near optical axis O, the object side 11 of the first lens L1 is concave at the circumference, and the image side 12 of the first lens L1 is at the circumference. The object side 21 of the second lens L2 is concave or convex at the near optical axis O, the image side 22 of the second lens L2 is concave or convex at the near optical axis O, and the object side 21 of the second lens L2 is at The circumference is concave or convex, and the image side 22 of the second lens L2 is concave or convex at the circumference; the object side 31 of the third lens L3 is concave at the near optical axis O, and the image side 32 of the third lens L3 is near the optical axis O. The optical axis O is convex, the object side 31 of the third lens L3 is convex at the circumference, the image side 32 of the third lens L3 is concave at the circumference; the object side 41 of the fourth lens L4 is at the near optical axis O. Concave, the image side 42 of the fourth lens L4 is convex at the near optical axis O, the object side 41 of the fourth lens L4 is concave at the circumference, and the image side 42 of the fourth lens L4 is convex at the circumference; the fifth lens The object side 51 of L5 is convex at the near optical axis O, the image side 52 of the fifth lens L5 is concave at the near optical axis O, the object side 51 of the fifth lens L5 is concave or convex at the circumference, and the fifth lens L5 is concave or convex at the circumference. The image side 52 of L5 is convex at the circumference.

Optionally, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can all be plastic lenses, so that the optical lens 100 can be light and thin, and at the same time, it is easy to understand the complex surface of the lens. type for processing. Alternatively, the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 can also be glass lenses, so that the optical lens 100 has good optical effects and can also reduce the optical Temperature sensitivity of lens 100 . Of course, some of the lenses can also be set to be glass lenses, and some of the lenses can be set to be plastic lenses. Specifically, the settings can be adjusted according to actual conditions, which are not specifically limited in this embodiment.

Optionally, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may be spherical lenses or aspherical lenses. It can be understood that one aspherical lens can achieve the effect of correcting the aberration of multiple spherical lenses. That is to say, the use of the aspherical lens can correct aberrations and reduce the number of lenses used, which is beneficial to meet the requirements of miniaturization of the optical lens 100 and improve the image quality. The specific number of spherical lenses and aspherical lenses can be set according to the actual situation. For example, the above-mentioned first lens L1 is a spherical lens, and the other lenses are aspherical lenses, or the first lens L1, the second lens L2, the third lens L3, the third lens The fourth lens L4 and the fifth lens L5 are both aspherical lenses, which are not specifically limited in this embodiment.

With reference to FIG. 2 , the focusing structure 60 is disposed between the first lens L1 and the second lens L2. Because the focusing structure 60 can quickly adjust the focal length according to different shooting conditions, and then control the amount of change of the focal power of the focusing structure 60 to realize the automatic focusing function of the optical lens 100, it is beneficial to realize the The fast focusing effect of the optical lens 100 improves the imaging quality of the optical lens 100 .

In some embodiments, the focusing structure 60 is an adjustable lens T-lens module, and the focusing structure 60 is used to realize focusing based on a control voltage. Specifically, the focusing structure 60 includes a peripheral packaging circuit (not shown) and a T-lens core component. The peripheral packaging circuit includes a driving chip, and the driving chip is used to provide a control voltage, and the control voltage provided by the driving chip is used to Drive T-lens core components. More specifically, the core component of the T-lens includes a substrate 61 , a protective film 62 , a focusing layer 63 and a piezoelectric actuator 64 that are sequentially arranged along the optical axis O from the object side to the image side. The substrate 61 has an object side 61a and an image side 61b, the protective film 62 is attached to the object side 61a of the substrate 61, and the focusing layer 63 has an object side 63a and an image side 63b, and the image side 63b of the focusing layer 63 is attached On the protective film 62 , the piezoelectric actuator 64 is disposed on the object side surface 63 a of the focusing layer 63 , and the piezoelectric actuator 64 is used to energize the focusing layer 63 .

Optionally, the focusing layer 63 can be a piezoelectric layer or a flexible layer wrapped with an optical liquid inside, that is, the focusing structure 60 can be a piezoelectric focusing structure or a liquid focusing structure. When the focusing layer 63 is a piezoelectric layer, the material of the piezoelectric layer is affected by the electric field force in the direction of the electric field, the atomic unit cell of the piezoelectric layer material will be elongated, and a large number of atomic unit cells will be elongated microscopically And when it accumulates to a certain amount, it will appear as the deformation of the piezoelectric layer material on the macroscopic level. Because the deformation of the piezoelectric layer material is caused by the deformation of the atomic unit cell, the piezoelectric material has a larger thrust than a focusing motor and other driving devices, and has a faster response speed and higher action accuracy, which is conducive to the realization of optical lenses. 100 quick focus effects. When the focusing layer 63 is a flexible layer wrapped with optical liquid, since there are extrusion rings on both sides of the flexible layer, the driving chip drives the extrusion rings to squeeze the surface of the flexible layer, so that the radius of curvature of the surface changes, and then Achieve the effect of fast focusing of the optical lens 100.

That is to say, the focusing structure 60 can adjust the focal length of the focusing structure 60 according to different voltages, thereby controlling the variation of the focal power of the focusing structure 60, so as to achieve the function of automatic focusing, which is beneficial to the premise of miniaturization. Therefore, the focusing effect of the optical lens 100 is realized, and the imaging quality of the optical lens 100 is improved. In addition, since the focusing structure 60 realizes focusing based on voltage control, a motor is not required in the focusing process, and no magnetic interference is generated.

Please refer to FIGS. 2 to 4 . FIGS. 2 to 4 illustrate the deformation of the focusing structure 60 under the action of 0V, 10V, and 30V. It can be seen from FIGS. 2 to 4 that when the voltage acting on the focusing structure 60 is larger, the deformation of the focusing structure 60 is larger, the optical power of the focusing structure 60 is larger, and the focal length is smaller. Therefore, by adjusting the voltage acting on the focusing structure 60 , the design requirement of fast focusing of the optical lens can be achieved.

In some embodiments, the optical lens 100 further includes a diaphragm 102, and the diaphragm 102 may be an aperture diaphragm 102 and/or a field diaphragm 102, which may be disposed on one of the object sides 11 of the first lens L1 of the optical lens 100. side. It can be understood that, in other embodiments, the diaphragm 102 can also be set at other positions, for example, between the image side 12 of the first lens L1 and the object side 21 of the second lens L2, and the setting can be adjusted according to the actual situation. , which is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 further includes a filter 70 , and the filter 70 is disposed between the fifth lens L5 and the imaging surface 101 of the optical lens 100 . Optionally, an infrared filter can be selected for the filter 70, so that infrared light can be filtered out, the imaging quality can be improved, and the imaging can be more in line with the visual experience of the human eye. It can be understood that the filter 70 may be made of optical glass coating or colored glass, which may be selected according to actual needs, which is not specifically limited in this embodiment.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.5<CTTlens/AIR<0.7; wherein, CTTlens is the thickness of the focusing structure 60 on the optical axis O, and AIR is the distance between the first lens L1 and the second lens L2 air gap. By reasonably controlling the ratio of the thickness of the focusing structure to the air gap between the first lens L1 and the second lens L2, not only the focusing structure 62 can have a suitable assembly space, the light can be smoothly transitioned, but also the optical lens can be ensured The overall structure is more compact. If CTTlens/AIR≥0.7, the air gap between the first lens L1 and the second lens L2 is small, and the assembly space of the focusing structure 60 is relatively small, resulting in the compact shape of the lens barrel of the optical lens, which affects the good assembly. If CTTlens/AIR≤0.5, the air gap between the first lens L1 and the second lens L2 is too large, which not only affects the imaging resolution of the entire optical lens 100, but also causes the light to not transition well, causing the first The edges of the first lens L1 and the second lens L2 are inflected, which is not conducive to the molding process.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8<TL/TTL<0.9; wherein, TL is the distance from the object side 11 of the first lens L1 to the image side 52 of the fifth lens L5 on the optical axis O, TTL is the distance on the optical axis from the object side surface 11 of the first lens L1 to the imaging surface 101 of the optical lens 100 (ie, the total length of the optical lens). By reasonably controlling the ratio of TL to TTL, the miniaturized design of the optical lens 100 can be realized, and the optical lens 100 can be guaranteed to have sufficient back focus, and the optical lens 100 can be guaranteed to have sufficient focusing space, so that when the optical lens 100 is applied to imaging When the module is used, the assembly yield of the camera module can be improved. If TL/TTL ≥ 0.9, the back focus will be too small, which is not conducive to the assembly of the camera module; if TL/TTL ≤ 0.8, the total length of the optical lens 100 will be compressed too much, resulting in a performance degradation of the optical lens 100 .

In some embodiments, the optical lens 100 satisfies the following relationship: 0.15<FBL/EFL<0.3; wherein, FBL is the distance from the image side 52 of the fifth lens L5 to the imaging surface of the optical lens 100 on the optical axis O (ie, the optical The back focus of the lens), EFL is the focal length of the optical lens 100. By controlling the ratio of the back focus of the optical lens 100 to the focal length of the optical lens 100, the optical lens 100 can be miniaturized while ensuring that the optical lens has a sufficient focusing range, so that when the optical lens 100 is applied to the camera module, it can The assembly yield of the camera module is improved, and the focal depth of the optical lens 100 is ensured to be larger, so that more depth information of the object can be obtained. If FBL/EFL ≥ 0.3, the optical lens 100 is compressed, resulting in too small depth of field, and more depth information cannot be obtained from the object; and if FBL/EFL ≤ 0.2, the assembly yield of the lens of the optical lens 100 will be too high. At the same time, the depth of focus of the optical lens 100 cannot be guaranteed, resulting in poor image quality.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.35rad/mm<RAD(FOV)/EFL<0.7rad/mm; wherein, FOV is the maximum field of view of the optical lens 100, and RAD(FOV) is The radian value of the maximum angle of view of the optical lens, EFL is the focal length of the optical lens 100 . When the above relationship is satisfied, the optical lens 100 can ensure that the optical lens 100 has a sufficient focusing range while meeting the miniaturization requirements, and can also achieve wide-angle shooting requirements. When RAD(FOV)/EFL ≥ 0.7rad/mm, the overall structure of the optical lens 100 is too compact, and aberration correction is difficult, resulting in decreased imaging performance. long, resulting in a shallow depth of field, which does not meet the clear imaging requirements of the optical lens 100 .

In some embodiments, the optical lens 100 satisfies the following relationship: -3<(R7+R8)/f4<-2; wherein, R7 is the radius of curvature of the object side surface 41 of the fourth lens L4 at the optical axis O, and R8 is The curvature radius of the image side surface 42 of the fourth lens L4 at the optical axis O, and f4 is the focal length of the fourth lens L4. By the definition of this relational expression, the curvature radius of the object side surface 41 of the fourth lens L4 at the optical axis O and the curvature radius of the image side surface 42 at the optical axis are more suitable for the focal length, which can reasonably balance the optical lens 100. The optical path difference between the marginal ray and the paraxial ray simultaneously corrects the field curvature and astigmatism generated by the fourth lens L4 , reduces the sensitivity of the optical lens 100 , and improves the assembly stability of each lens of the optical lens 100 . If (R7+R8)/f4≤-3, the curved surfaces of the object side 41 and the image side 42 of the fourth lens L4 will be bent too much, which increases the sensitivity of the optical lens 100 and reduces the assembly stability of the lenses of the optical lens 100 ; If (R7+R8)/f4≥-2, it will cause the focal length and the curved surface radius of the fourth lens L4 to be unsuitable, resulting in a decrease in the imaging performance of the optical lens 100, and it cannot be well balanced between the edge light of the optical lens 100 and the close The optical path difference of the axial rays cannot correct the field curvature and astigmatism generated by the fourth lens L4.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.8<∑ET/∑CT<1.1; wherein, ∑ET is the maximum diameter of the object side of each lens in the first lens L1 to the fifth lens L5 The sum of the distances from the maximum aperture to the image side in the direction of the optical axis O (that is, the sum of the edge thicknesses), ΣCT is the sum of the thicknesses of the first lens L1 to the fifth lens L5 on the optical axis. and (i.e. the sum of the center thicknesses). By reasonably controlling the sum of the center thickness and the edge thickness of each lens of the optical lens 100, the optical path difference between the center field of view and the edge field of view of the optical lens 100 can be reasonably balanced, effectively improving field curvature and reducing distortion. If ∑ET/∑CT>1.1, the optical path of the fringe field of view will be larger than the optical path of the central ray, resulting in excessive field curvature and blurring of images in the outer field of view; if ∑ET/∑CT<0.8, the fringe field of view will be caused The optical length of the ray is smaller than that of the central ray, which also causes the field curvature to be too large, causing blurred images in the outer field of view.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.1mm<(CTL1*SDL1)/|R2|<0.7mm; wherein, CTL1 is the thickness of the first lens L1 on the optical axis O, and SDL1 is the effective aperture of the image side surface 12 of the first lens L1, and R2 is the radius of curvature of the image side surface 12 of the first lens L1 at the optical axis. By reasonably controlling the external dimensions and curvature radius of the image side surface 12 of the first lens L1, the optical lens 100 can have the characteristics of a wide angle and a small head. If (CTL1*SDL1)/R2≤0.1mm, the head size of the optical lens 100 will be too small, which is not conducive to the molding process and reduces the assembly yield of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 0<airlt-airgt<0.2mm; wherein, airlt is the image side 22 of the second lens L2 to the object side 31 of the third lens L3 parallel to the light The maximum air gap in the axial direction, airgt is the smallest air gap in the direction parallel to the optical axis from the image side 22 of the second lens L2 to the object side 31 of the third lens L3. Since the image side 22 of the second lens L2 and the object side 31 of the third lens L3 are two sensitive surfaces in the optical lens, the air between the image side 22 of the second lens L2 and the object side 31 of the third lens L3 The smaller the difference between the maximum value and the minimum value of the gap, the better the fit between the two surfaces. If the two surfaces fit well, the overall processing yield of the optical lens 100 will be higher. It can be seen that if airlt-airgt ≥ 0.2 mm, the fitting of the two surfaces is not good enough, which affects the processing yield of the optical lens and increases the sensitivity of the optical lens 100 at the same time.

The optical lens of the embodiment will be described in detail below with reference to specific parameters.

Example 1

A schematic structural diagram of an optical lens 100 disclosed in Embodiment 1 of the present invention is shown in FIG. 1 . The optical lens 100 includes a first lens L1 , a focusing structure 60 , and a second lens L2 arranged in sequence along the optical axis O from the object side to the image side , a third lens L3 , a fourth lens L4 , a fifth lens L5 and a filter 70 .

Further, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, and the fifth lens L5 has negative refractive power .

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and convex at the near optical axis O, and the object side 11 and the image side 12 of the first lens L1 are respectively concave and convex at the circumference; the second The object side surface 21 and the image side surface 22 of the lens L2 are respectively concave and convex at the near optical axis O, and the object side surface 21 and the image side surface 22 of the second lens L2 are concave surfaces at the circumference; The image side 32 is respectively concave and convex at the near optical axis O, the object side 31 and the image side 32 of the third lens L3 are respectively convex and concave at the circumference; the object side 41 and the image side 42 of the fourth lens L4 are near the The optical axis O is respectively concave and concave, the object side 41 and the image side 42 of the fourth lens L4 are respectively concave and convex at the circumference; the object side 51 and the image side 52 of the fifth lens L5 are respectively at the near optical axis O. The object side 51 and the image side 52 of the fifth lens L5 are respectively convex and concave at the circumference.

Specifically, taking the effective focal length EFL=2.86mm/2.802mm/2.873mm of the optical lens 100 as an example, that is, the EFL means that the optical lens 100 is in a near-focus state (ie, object distance=100mm) and a medium-focus state (normal state, That is, the effective focal length under the object distance=400mm) and the far focus state (ie the object distance=1500mm). Specifically, in the near focus state, EFL=2.86mm; in the middle focus state, EFL=2.802mm; in the far focus state, EFL=2.873mm. The aperture value of the optical lens 100 is fno=2.48, the field of view of the optical lens 100 is FOV=94.822°, the total length of the optical lens 100 is TTL=5.01mm, and the optical lens 100 is in a near-focus state (ie object distance=100mm) and a medium-focus state Other parameters of (ie object distance=400mm), far focus state (ie object distance=1500mm) are given in Table 1 below. The elements along the optical axis O of the optical lens 100 from the object side to the image side are sequentially arranged in the order of the elements in Table 1 from top to bottom. In the same lens, the surface with a smaller surface number is the object side of the lens, and the surface with a larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side 11 and the image side of the first lens L1 respectively. 12. The Y radius in Table 1 is the curvature radius of the object side or image side of the corresponding surface number at the optical axis O, wherein the Y radius of the focusing layer 63 is the curvature radius of the object side 63a of the focusing layer 63, and the protective film 62 The Y radius is the radius of curvature of the image side surface 63b of the focusing layer 63 . The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side of the lens to the rear surface on the optical axis O. The value of the diaphragm 102 in the "thickness" parameter column is the distance from the diaphragm 102 to the object side surface 11 of the first lens L1 on the optical axis O. The materials of the focusing layer 63 and the protective film 62 in Table 1 are high-molecular polymers, and the high-molecular polymers can be plastics, such as polyethylene plastics, polyethylene terephthalic acid plastics or polycarbonate plastics, etc.; The material of 61 can be glass or plastic, such as polycarbonate plastic (Polycarbonate Plastic, PC). It can be understood that the units of Y radius, thickness, and focal length in Table 1 are all mm, and the refractive index, Abbe number, and focal length in Table 1 are obtained at a reference wavelength of 555 nm.

It should be noted that the thickness of the object surface in Table 1 represents the distance between the object to be photographed and the optical lens 100 , that is, ΔOBJ represents the aforementioned object distance. ΔR1 in Table 1 represents the radius of curvature (ie Y radius) of the focusing layer and protective film, ΔT1 represents the air gap of the focusing layer, and ΔT2 represents the air gap of the protective film. ΔF represents the overall focal length of the focusing structure. T1 represents the object side of the focusing layer of the focusing structure, T2 represents the object side of the protective film, T3 represents the object side of the substrate, and T4 represents the image side of the substrate. Please also refer to Table 2. Table 2 shows the optical The focal length EFL of the lens 100, the object distance ΔOBJ of the optical lens 100, the focusing structure, the curvature radius ΔR1 of the protective film, the air gap ΔT1 of the focusing layer, and the air gap ΔT2 of the protective film are different values.

Further, in the first embodiment, the object side surface and the image side surface of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 are aspherical, and the surface type of each aspherical lens is x can be defined using, but not limited to, the following aspheric formula:

Among them, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis O direction; c is the curvature of the aspheric surface at the optical axis O, c=1/Y (that is, paraxial The curvature c is the reciprocal of the curvature radius Y in the above table 1); K is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 3 below shows the high-order coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface in the first embodiment.

Table 1

Table 2

table 3

Please refer to FIG. 5 . FIG. 5 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 in the first embodiment in a near-focus state (ie, object distance=100 mm). Specifically, please refer to FIG. 5 . (A), (A) in FIG. 5 shows the longitudinal spherical aberration curves of the optical lens 100 in the first embodiment at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm and 435 nm, (A) in FIG. 5 ), the abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the normalized field of view. It can be seen from (A) in FIG. 5 that the spherical aberration value of the optical lens 100 in the first embodiment is better, which indicates that the imaging quality of the optical lens 100 in this embodiment is better. Please refer to (B) in FIG. 5 . (B) in FIG. 5 is a light astigmatism diagram of the optical lens 100 in the first embodiment at a wavelength of 555 nm. The abscissa along the X-axis direction represents the focus shift, and the ordinate along the Y-axis direction represents the image height, and the unit is mm. The astigmatism curve represents the curvature T of the meridional imaging plane and the curvature S of the sagittal imaging plane. It can be seen from (B) in FIG. 5 that at this wavelength, the astigmatism of the optical lens 100 is well compensated. Please refer to (C) in FIG. 5 . (C) in FIG. 5 is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 555 nm. Among them, the abscissa along the X-axis direction represents the distortion, and the ordinate along the Y-axis direction represents the image height, and the unit is mm. As can be seen from (C) in FIG. 5 , at a wavelength of 555 nm, the distortion of the optical lens 100 is well corrected.

Please refer to FIG. 6 to FIG. 7 , from (A) longitudinal spherical aberration graph in FIG. 6 to FIG. 7 , (B) ray astigmatism diagram in FIG. 6 to FIG. 7 , and (C) in FIG. 6 to FIG. 7 It can be seen from the distortion graph that the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 are well controlled under the conditions of medium focus (ie object distance=400mm) and far focus (ie object distance=1500mm), so this embodiment The optical system 100 has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in (A) in FIGS. 6 to 7 , (B) in FIGS. 6 to 7 , and (C) in FIGS. 6 to 7 , reference may be made to the above ( The contents described in A), (B) in FIG. 5 , and (C) in FIG. 5 will not be repeated here.

Embodiment 2

A schematic structural diagram of the optical lens 100 disclosed in the second embodiment of the present invention is shown in FIG. 8 . The optical lens 100 includes a first lens L1 , a focusing structure 60 , and a second lens L2 arranged in sequence along the optical axis O from the object side to the image side , a third lens L3 , a fourth lens L4 , a fifth lens L5 and a filter 70 .

Further, the first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, and the fifth lens L5 has negative refractive power.

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and convex at the near optical axis O, and the object side 11 and the image side 12 of the first lens L1 are respectively concave and convex at the circumference; the second The object side 21 and the image side 22 of the lens L2 are respectively concave and convex at the near optical axis O, and the object side 21 and the image side 22 of the second lens L2 are respectively convex and concave at the circumference; the object side of the third lens L3 31. The image side 32 is respectively concave and convex at the near optical axis O, the object side 31 and the image side 32 of the third lens L3 are respectively convex and concave at the circumference; the object side 41 and the image side 42 of the fourth lens L4 are respectively convex and concave. Be concave surface, convex surface respectively at near-optical axis O place, the object side surface 41 of the 4th lens L4, like side surface 42 are respectively concave surface, concave surface at the circumference; The object side 51 and the image side 52 of the fifth lens L5 are respectively concave and convex at the circumference.

Specifically, take the EFL as the focal length of the optical lens 100 in the near-focus state (ie, the object distance=100mm), the middle-focus state (normal state, that is, the object distance=400mm), and the telephoto state (ie, the object distance=1500mm) as an example . Specifically, in the near focus state, EFL=2.675mm; in the middle focus state, EFL=2.72mm; in the far focus state, EFL=2.73mm. The aperture value of the optical lens 100 is fno=2.48, the field of view of the optical lens 100 is FOV=97.91°, the total length of the optical lens 100 is TTL=4.97mm, and the optical lens 100 is in a near-focus state (ie, object distance=100mm) and a medium-focus state Other parameters of (ie object distance=400mm) and far focus state (ie object distance=1500mm) are given in Table 4 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, and will not be repeated here. It can be understood that the units of Y radius, thickness, and focal length in Table 4 are all mm, and the refractive index, Abbe number, and focal length in Table 4 are obtained at a reference wavelength of 555 nm.

It is worth noting that, the definition of each parameter in Table 4 may refer to the definition of each parameter in Table 1 above, and the description of Table 5 may refer to the description of Table 2 in Embodiment 1 above, which will not be repeated here.

In the second embodiment, the object side and the image side of any one of the first lens L1 to the fifth lens L5 are aspherical, and the calculation method of the surface x of each aspherical lens can be used in the description of the previous embodiment. Therefore, it is not repeated here. Table 6 below gives the coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 of higher order terms that can be used for each aspherical mirror surface in the second embodiment.

Table 4

table 5

Medium focus close focus far focus Object distance ΔOBJ 400mm 100mm 1500mm ΔT1 0 -0.01282mm 0.0030mm ΔR1 unlimited 78mm -330mm ΔT2 0 0.01282mm -0.0030mm Focal length ΔF 0 136.02mm -575.48mm EFL 2.720mm 2.675mm 2.730mm

Table 6

Please refer to FIGS. 9 to 11 , from (A) longitudinal spherical aberration graphs in FIGS. 9 to 11 , (B) ray astigmatism diagrams in FIGS. 9 to 11 , and (C) in FIGS. 10 to 13 . It can be seen from the distortion curve diagram that the optical system 100 is in the near focus (ie object distance=100mm), medium focus (ie object distance=400mm), far focus (ie object distance=1500mm) and focal length infinity (ie object distance is infinite). Longitudinal spherical aberration, astigmatism and distortion are all well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, for the wavelengths corresponding to the curves in (A) in FIGS. 9 to 11 , (B) in FIGS. 9 to 11 , and (C) in FIGS. 9 to 11 , reference may be made to the reference to FIG. The content described in (A) in FIG. 5 , (B) in FIG. 5 , and (C) in FIG. 5 will not be repeated here.

Embodiment 3

A schematic structural diagram of the optical lens 100 disclosed in the third embodiment of the present invention is shown in FIG. 12 . The optical lens 100 includes a first lens L1 , a focusing structure 60 , and a second lens L2 arranged in sequence along the optical axis O from the object side to the image side , a third lens L3 , a fourth lens L4 , a fifth lens L5 and a filter 70 .

Further, the first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, and the fifth lens L5 has negative refractive power.

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and convex at the near optical axis O, and the object side 11 and the image side 12 of the first lens L1 are respectively concave and convex at the circumference; the second The object side 21 and the image side 22 of the lens L2 are respectively concave and convex at the near optical axis O, and the object side 21 and the image side 22 of the second lens L2 are respectively convex and concave at the circumference; the object side of the third lens L3 31. The image side 32 is respectively concave and convex at the near optical axis O, the object side 31 and the image side 32 of the third lens L3 are respectively convex and concave at the circumference; the object side 41 and the image side 42 of the fourth lens L4 are respectively convex and concave. Be respectively concave surface, concave surface at near optical axis O place, the object side surface 41 of the 4th lens L4, like side surface 42 are respectively concave surface, convex surface at the circumference; The object side 51 and the image side 52 of the fifth lens L5 are respectively concave and convex at the circumference.

Specifically, take the focal lengths of the optical lens 100 in a near-focus state (ie, object distance=100mm), a medium-focus state (normal state, namely, object distance=400mm), and a telephoto state (ie, object distance=1500mm) as an example. Specifically, in the near focus state, EFL=2.97mm; in the middle focus state, EFL=3.198mm; in the far focus state, EFL=3.05mm. The aperture value of the optical lens 100 is fno=2.98, the field angle of the optical lens 100 is FOV=90.021°, the total length of the optical lens 100 is TTL=5.38mm, and the optical lens 100 is in a near-focus state (ie, object distance=100mm) and a medium-focus state Other parameters of (ie object distance=400mm) and far focus state (ie object distance=1500mm) are given in Table 7 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, and will not be repeated here. It can be understood that the units of Y radius, thickness, and focal length in Table 7 are all mm, and the refractive index, Abbe number, and focal length in Table 7 are obtained at a reference wavelength of 555 nm.

For the definition of each parameter in Table 7, reference may be made to the definition of each parameter in Table 1 above. For the description of Table 8, reference may be made to the description of Table 2 in Embodiment 1 above, which will not be repeated here.

In the third embodiment, the object side and the image side of any one of the first lens L1 to the fifth lens L5 are aspherical, and the calculation method of the surface x of each aspherical lens can be used in the description of the previous embodiment. Therefore, it is not repeated here. Table 9 below shows the high-order coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror surface in Example 3.

Table 7

Table 8

Medium focus close focus far focus Object distance ΔOBJ 400mm 100mm 1500mm ΔT1 0 -0.0133mm 0.0033mm ΔR1 unlimited 75mm -340mm ΔT2 0 0.0133mm -0.0033mm Focal length ΔF 0 127.31mm -523.17mm EFL 3.198mm 2.97mm 3.05mm

Please refer to FIGS. 13 to 15 , from (A) longitudinal spherical aberration graphs in FIGS. 13 to 15 , (B) ray astigmatism graphs in FIGS. 13 to 15 , and (C) in FIGS. 13 to 15 . It can be seen from the distortion graph that the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 at near focus (ie object distance=100mm), medium focus (ie object distance=400mm), and far focus (ie object distance=1500mm) are all uniform. Good control is obtained, so that the optical system 100 of this embodiment has good imaging quality. In addition, for the wavelengths corresponding to the curves in (A) in FIGS. 13 to 15 , (B) in FIGS. 13 to 15 , and (C) in FIGS. 13 to 15 , reference may be made to the reference to FIG. 5 in Embodiment 1 The content described in (A) in FIG. 5 , (B) in FIG. 5 , and (C) in FIG. 5 will not be repeated here.

Embodiment 4

A schematic structural diagram of an optical lens 100 disclosed in Embodiment 4 of the present invention is shown in FIG. 16 . The optical lens 100 includes a first lens L1 , a focusing structure 60 , and a second lens L2 arranged in sequence along the optical axis O from the object side to the image side , a third lens L3 , a fourth lens L4 , a fifth lens L5 and a filter 70 .

Further, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, and the fifth lens L5 has negative refractive power .

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and convex at the near optical axis O, and the object side 11 and the image side 12 of the first lens L1 are respectively concave and convex at the circumference; the second The object side 21 and the image side 22 of the lens L2 are respectively concave and convex at the near optical axis O, and the object side 21 and the image side 22 of the second lens L2 are respectively convex and convex at the circumference; the object side of the third lens L3 31. The image side 32 is respectively concave and convex at the near optical axis O, the object side 31 and the image side 32 of the third lens L3 are respectively convex and concave at the circumference; the object side 41 and the image side 42 of the fourth lens L4 are respectively convex and concave. Be respectively concave surface, concave surface at near optical axis O place, the object side surface 41 of the 4th lens L4, like side surface 42 are respectively concave surface, convex surface at the circumference; The object side 51 and the image side 52 of the fifth lens L5 are respectively concave and convex at the circumference.

Specifically, the focal length of the optical lens 100 is respectively in the near focus state (ie object distance=100mm), the middle focus state (normal state, namely object distance=400mm), and the telephoto state (ie object distance=1500mm) as an example. Specifically, in the near focus state, EFL=3.145mm; in the middle focus state, EFL=3.224mm; in the far focus state, EFL3.24mm. The aperture value of the optical lens 100 is fno=2.98, the field angle of the optical lens 100 is FOV=86.49°, and the total length of the optical lens 100 is TTL=5.18 mm. Other parameters of the optical lens 100 in the near focus state (ie object distance=100mm), the medium focus state (ie object distance=400mm), and the far focus state (ie object distance=1500mm) are given in Table 10 below, and each parameter The definition of can be derived from the description of the foregoing embodiments, and will not be repeated here. It can be understood that the units of Y radius, thickness, and focal length in Table 10 are all mm, and the refractive index, Abbe number, and focal length in Table 10 are obtained at a reference wavelength of 555 nm. The definition of each parameter in Table 10 can refer to the definition of each parameter in Table 1 above. For the description of Table 11, reference can be made to the description of Table 2 in Embodiment 1 above, which will not be repeated here.

In the fourth embodiment, the object side and the image side of any one of the first lens L1 to the fifth lens L5 are aspherical, and the calculation method of the surface x of each aspherical lens can be used in the description of the previous embodiment. Therefore, it is not repeated here. Table 12 below shows the coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 of higher order terms that can be used for each aspherical mirror surface in Example 4.

Table 10

Table 11

Medium focus close focus far focus Object distance ΔOBJ 400mm 100mm 1500mm ΔT1 0 -0.01408mm 0.0033mm ΔR1 unlimited 71mm -300mm ΔT2 0 0.01408mm -0.0033mm Focal length ΔF 0 123.82mm -523.17mm EFL 3.224mm 3.145mm 3.24mm

Table 12

Please refer to FIGS. 17 to 19 , from (A) longitudinal spherical aberration graphs in FIGS. 17 to 19 , (B) ray astigmatism graphs in FIGS. 17 to 19 , and (C) in FIGS. 17 to 19 . It can be seen from the distortion graph that the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 at near focus (ie object distance=100mm), medium focus (ie object distance=400mm), and far focus (ie object distance=1500mm) are all uniform. Good control is obtained, so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in (A) in FIGS. 17 to 19 , (B) in FIGS. 17 to 19 , and (C) in FIGS. 17 to 19 , reference may be made to FIG. 5 in Embodiment 1 The content described in (A) in FIG. 5 , (B) in FIG. 5 , and (C) in FIG. 5 will not be repeated here.

Embodiment 5

A schematic structural diagram of an optical lens 100 disclosed in Embodiment 5 of the present invention is shown in FIG. 20 . The optical lens 100 includes a first lens L1 , a focusing structure 60 , and a second lens L2 arranged in sequence along the optical axis O from the object side to the image side , a third lens L3 , a fourth lens L4 , a fifth lens L5 and a filter 70 .

Further, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, and the fifth lens L5 has negative refractive power .

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and convex at the near optical axis O, and the object side 11 and the image side 12 of the first lens L1 are respectively concave and convex at the circumference; the second The object side 21 and the image side 22 of the lens L2 are respectively convex and concave at the near optical axis O, and the object side 21 and the image side 22 of the second lens L2 are respectively convex and convex at the circumference; the object side of the third lens L3 31. The image side 32 is respectively concave and convex at the near optical axis O, the object side 31 and the image side 32 of the third lens L3 are respectively convex and concave at the circumference; the object side 41 and the image side 42 of the fourth lens L4 are respectively convex and concave. Be respectively concave surface, concave surface at near optical axis O place, the object side surface 41 of the 4th lens L4, like side surface 42 are respectively concave surface, convex surface at the circumference; The object side 51 and the image side 52 of the fifth lens L5 are respectively concave and convex at the circumference.

Specifically, the focal length of the optical lens 100 is in a near focus state (ie object distance=100mm), a medium focus state (normal state, namely object distance=400mm), and a far focus state (ie object distance=1500mm). Specifically, in the near focus state, EFL=2.983mm; in the middle focus state, EFL=3.224mm; in the far focus state, EFL=3.067mm. The aperture value of the optical lens 100 is fno=2.48, the field of view of the optical lens 100 is FOV=90.88°, the total length of the optical lens 100 is TTL=5.04mm, and the optical lens 100 is in a near-focus state (ie, object distance=100mm) and a medium-focus state Other parameters of (ie object distance=400mm) and far focus state (ie object distance=1500mm) are given in Table 13 below, and the definitions of the parameters can be obtained from the descriptions of the foregoing embodiments, and will not be repeated here. It can be understood that the units of Y radius, thickness, and focal length in Table 13 are all mm, and the refractive index, Abbe number, and focal length in Table 3 are obtained at a reference wavelength of 555 nm. For the definition of each parameter in Table 13, reference may be made to the definition of each parameter in Table 1 above. For the description of Table 14, reference may be made to the description of Table 2 in Embodiment 1 above, which will not be repeated here.

In the fifth embodiment, the object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical, and the calculation method of the surface shape x of each aspherical lens can be used in the description of the previous embodiment. Therefore, it is not repeated here. Table 15 below shows the coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 of higher order terms that can be used for each aspherical mirror surface in Example 5.

Table 13

Table 14

Medium focus close focus far focus Object distance ΔOBJ 400mm 100mm 1200mm ΔT1 0 -0.01370mm 0.0033mm ΔR1 unlimited 73mm -300mm ΔT2 0 0.01370mm -0.0033mm Focal length ΔF 0 127.31mm -523.17mm EFL 3.224mm 2.983mm 3.067mm

Table 15

Please refer to FIGS. 21 to 23 , from (A) longitudinal spherical aberration graphs in FIGS. 21 to 23 , (B) ray astigmatism diagrams in FIGS. 21 to 23 , and (C) in FIGS. 21 to 23 . It can be seen from the distortion graph that the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 at near focus (ie object distance=100mm), medium focus (ie object distance=400mm), and far focus (ie object distance=1500mm) are all uniform. Good control is obtained, so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in (A) in FIGS. 21 to 23 , (B) in FIGS. 21 to 23 , and (C) in FIGS. 21 to 23 , reference may be made to FIG. 5 in Embodiment 1 The content described in (A) in FIG. 5 , (B) in FIG. 5 , and (C) in FIG. 5 will not be repeated here.

Embodiment 6

A schematic structural diagram of an optical lens 100 disclosed in Embodiment 6 of the present invention is shown in FIG. 24 . The optical lens 100 includes a first lens L1 , a focusing structure 60 , and a second lens L2 arranged in sequence along the optical axis O from the object side to the image side , a third lens L3 , a fourth lens L4 , a fifth lens L5 and a filter 70 .

Further, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, and the fifth lens L5 has negative refractive power .

Further, the object side 11 and the image side 12 of the first lens L1 are respectively convex and convex at the near optical axis O, and the object side 11 and the image side 12 of the first lens L1 are respectively concave and convex at the circumference; the second The object side 21 and the image side 22 of the lens L2 are respectively concave and convex at the near optical axis O, and the object side 21 and the image side 22 of the second lens L2 are respectively convex and convex at the circumference; the object side of the third lens L3 31. The image side 32 is respectively concave and convex at the near optical axis O, the object side 31 and the image side 32 of the third lens L3 are respectively convex and concave at the circumference; the object side 41 and the image side 42 of the fourth lens L4 are respectively convex and concave. Be respectively concave and convex at near optical axis O, the object side 41 and image side 42 of the fourth lens L4 are respectively concave and convex at the circumference; The object side 51 and the image side 52 of the fifth lens L5 are respectively concave and convex at the circumference.

Specifically, the focal length EFL of the optical lens 100 is respectively in a near focus state (ie object distance=100mm), a medium focus state (normal state, that is, object distance=400mm), and a telephoto state (ie object distance=1500mm) as an example. Specifically, in the near focus state, EFL=3.598mm; in the middle focus state, EFL=3.703mm; in the far focus state, EFL=3.721mm. The aperture value of the optical lens 100 is fno=2.97, the field of view of the optical lens 100 is FOV=85.958°, the total length of the optical lens 100 is TTL=5.92mm, and the optical lens 100 is in a near-focus state (ie object distance=100mm) and a medium-focus state Other parameters of (ie object distance=400mm) and far focus state (ie object distance=1500mm) are given in Table 16 below, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, and will not be repeated here. It can be understood that the units of Y radius, thickness, and focal length in Table 16 are all mm, and the refractive index, Abbe number, and focal length in Table 16 are obtained at a reference wavelength of 555 nm. For the definition of each parameter in Table 16, reference may be made to the definition of each parameter in the foregoing Table 1. Similarly, for the description of Table 17, reference may be made to the description of Table 2 in the foregoing Embodiment 1, which will not be repeated here.

In the sixth embodiment, the object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical, and the calculation method of the surface shape x of each aspherical lens can be used in the description of the previous embodiment. Therefore, it is not repeated here. Table 18 below shows the coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 of higher order terms that can be used for each aspherical mirror surface in Example VI.

Table 16

Table 17

Medium focus close focus far focus state Object distance ΔOBJ 400mm 100mm 1200mm ΔT1 0 -0.01389mm 0.0022mm ΔR1 unlimited 72mm -450mm ΔT2 0 0.01389mm -0.0022mm Focal length ΔF 0 125.56mm -784.75mm EFL 3.703mm 3.598mm 3.721mm

Table 18

Please refer to FIGS. 25 to 27 , from (A) longitudinal spherical aberration graphs in FIGS. 25 to 27 , (B) ray astigmatism diagrams in FIGS. 25 to 27 , and (C) in FIGS. 25 to 27 It can be seen from the distortion graph that the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 at near focus (ie object distance=100mm), medium focus (ie object distance=400mm), and far focus (ie object distance=1500mm) are all uniform. Good control is obtained, so that the optical system 100 of this embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in (A) in FIGS. 25 to 27 , (B) in FIGS. 25 to 27 , and (C) in FIGS. 25 to 27 , reference may be made to the reference to FIG. The content described in (A) in FIG. 5 , (B) in FIG. 5 , and (C) in FIG. 5 will not be repeated here.

Please refer to Table 19. Table 19 is a summary of the ratios of the relational expressions in Embodiments 1 to 6 of the present invention.

Table 19

In the second aspect, please refer to FIG. 28 , the present invention further discloses a camera module 200 . The camera module 200 includes an image sensor 201 and the optical lens 100 according to any one of the above-mentioned embodiments 1 to 6. The image sensor 201 is disposed on the image side of the optical lens 100, and the image sensor 201 is used to convert the light signal corresponding to the subject into an image signal, which will not be repeated here. It can be understood that the camera module 200 having the above-mentioned optical lens 100 can meet the design requirements of small distortion and fast focusing of the camera module 200 and improve the imaging quality of the camera module 200 .

In a third aspect, please refer to FIG. 29 , the present invention further discloses an electronic device 300 , the electronic device 300 includes a casing and the above-mentioned camera module 200 , and the camera module 200 is disposed in the casing. It can be understood that the electronic device 300 having the above-mentioned camera module 200 can meet the design requirements of small distortion and fast focusing of the electronic device 300 and improve the imaging quality of the electronic device 300 .

An optical lens, a camera module, and an electronic device disclosed in the embodiments of the present invention have been described above in detail. The principles and implementations of the present invention are described with specific examples in this paper. The descriptions of the above embodiments are only used to help Understand the optical lens, camera module, electronic device and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. Above, the content of this specification should not be construed as limiting the present invention.

Claims (11)

1. An optical lens, characterized in that it comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens that are sequentially arranged along an optical axis from an object side to an image side; The first lens has a positive refractive power, and both the object side and the image side of the first lens are convex at the near optical axis; the second lens has optical power; The third lens has a negative refractive power, the object side of the third lens is concave at the near optical axis, and the image side of the third lens is convex at the near optical axis; The fourth lens has a positive refractive power, the object side of the fourth lens is concave at the near optical axis, and the image side of the fourth lens is convex at the near optical axis; The fifth lens has negative refractive power, the object side of the fifth lens is convex at the near optical axis, and the image side of the fifth lens is concave at the near optical axis; The optical lens further includes a focus adjustment structure, and the focus adjustment structure is disposed between the first lens and the second lens, and has an air gap between the first lens and the second lens. 2. The optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.5<CTTlens/AIR<0.7; Wherein, CTTlens is the thickness of the focusing structure on the optical axis, and AIR is the air gap between the first lens and the second lens. 3. The optical lens according to claim 1, wherein the optical lens satisfies the following relational formula: 0.8<TL/TTL<0.9; Wherein, TL is the distance from the object side of the first lens to the image side of the fifth lens on the optical axis, and TTL is the distance between the object side of the first lens and the imaging plane of the optical lens. the distance on the optical axis. 4. The optical lens according to claim 1, wherein the optical lens satisfies the following relationship: 0.15<FBL/EFL<0.3; Wherein, FBL is the distance from the image side surface of the fifth lens to the imaging surface of the optical lens on the optical axis, and EFL is the focal length of the optical lens. 5. The optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.35rad/mm<RAD(FOV)/EFL<0.7rad/mm; Wherein, RAD(FOV) is the radian value of the maximum angle of view of the optical lens, and EFL is the focal length of the optical lens. 6. The optical lens according to claim 1, wherein the optical lens satisfies the following relation: -3<(R7+R8)/f4<-2; Wherein, R7 is the radius of curvature of the object side of the fourth lens at the optical axis, R8 is the radius of curvature of the image side of the fourth lens at the optical axis, and f4 is the radius of curvature of the fourth lens focal length. 7. The optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.8<∑ET/∑CT<1.1; Among them, ∑ET is the sum of the distances from the first lens to the fifth lens, from the maximum aperture of the object side of each lens to the maximum aperture of the image side in the direction of the optical axis, and ∑CT is the The sum of the thicknesses of the first lens to the fifth lens on the optical axis. 8 . The optical lens according to claim 1 , wherein the optical lens satisfies the following relation: 0.1mm<(CTL1*SDL1)/|R2|<0.7mm; 8 . Wherein, CTL1 is the thickness of the first lens on the optical axis, SDL1 is the effective aperture of the image side of the first lens, and R2 is the curvature radius of the image side of the first lens at the optical axis. 9. The optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0<airlt-airgt<0.2mm; where airlt is the maximum air gap from the image side of the second lens to the object side of the third lens parallel to the optical axis, and airgt is the distance from the image side of the second lens to the object of the third lens Minimum air gap in the direction of the sides parallel to the optical axis. 10. A camera module, characterized in that the camera module comprises an image sensor and the optical lens according to any one of claims 1-9, and the image sensor is disposed on the image side of the optical lens. 11. An electronic device, characterized in that the electronic device comprises a casing and the camera module according to claim 10, wherein the camera module is disposed on the casing.

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