Optical lens, camera module and electronic equipment
阅读说明：本技术 光学镜头、摄像模组及电子设备 (Optical lens, camera module and electronic equipment ) 是由 邹金华 张文燕 李明 于 2021-11-15 设计创作，主要内容包括：本发明公开的光学镜头、摄像模组及电子设备,光学镜头包括沿光轴从物侧至像侧依次设置的第一透镜、第二透镜、第三透镜、第四透镜、第五透镜和第六透镜；第一透镜具有正屈折力,第一透镜的物侧面于近光轴处和圆周处均为凹面,第二透镜具有屈折力,第二透镜的物侧面于近光轴处和圆周处均为凹面,第三透镜具有负屈折力,第四透镜具有正屈折力,第五透镜具有屈折力,第五透镜的物侧面于近光轴处和圆周处均为凹面；光学镜头满足以下关系:2 mm～(-1)<R2/(R3*f1)<20 mm～(-1)。本发明提供的光学镜头、摄像模组及电子设备,能够在满足高质量成像的同时,实现光学镜头的小型化设计。(The invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged in sequence from an object side to an image side along an optical axis; the first lens element with positive refractive power has a concave object-side surface at paraxial region and a concave object-side surface at circumference, the second lens element with refractive power has a concave object-side surface at paraxial region and a concave object-side surface at circumference, the third lens element with negative refractive power has a positive refractive power, the fourth lens element with positive refractive power has a concave object-side surface at paraxial region and a concave object-side surface at circumference, and the fifth lens element with positive refractive power has a concave object-side surface at paraxial region and a concave object-side surface at circumference; the optical lens satisfies the following relation of 2mm ‑1 <R2/(R3*f1)<20 mm ‑1 . The optical lens, the camera module and the electronic equipment provided by the invention can meet the requirement of high-quality imaging,the miniaturization design of the optical lens is realized.)
1. An optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are arranged in order from an object side to an image side along an optical axis;
the first lens element with positive refractive power has a concave object-side surface at paraxial region and a concave object-side surface at circumference;
the second lens element with refractive power has a concave object-side surface at paraxial region and a concave object-side surface at periphery;
the third lens element with negative refractive power;
the fourth lens element with positive refractive power;
the fifth lens element with refractive power has a concave object-side surface at paraxial region thereof, and a concave object-side surface at periphery thereof;
the sixth lens element with negative refractive power;
the optical lens satisfies the following relation: 2mm-1<R2/(R3*f1)<20 mm-1；
Wherein R2 is a radius of curvature of an object-side surface of the first lens at an optical axis, R3 is a radius of curvature of an image-side surface of the first lens at the optical axis, and f1 is a focal length of the first lens.
2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 50 degree<HFOV<55 deg., and 2mm-1<tan(HFOV)/SD11<2.5mm-1；
Wherein the HFOV is a half of a maximum angle of view of the optical lens, and the SD11 is a half of a maximum effective aperture of an object-side surface of the first lens.
3. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.7< R4/R5< 1.8;
wherein R4 is a curvature radius of an object side surface of the second lens at an optical axis, and R5 is a curvature radius of an image side surface of the second lens at the optical axis.
4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 3.5< (CT1+ CT2)/(T12+ T23) < 10;
wherein CT1 is an axial thickness of the first lens element, CT2 is an axial thickness of the second lens element, T12 is an axial distance between the first and second lens elements, and T23 is an axial distance between the second and third lens elements.
5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 1.0< f12/f < 2;
wherein f12 is a combined focal length of the first lens and the second lens, and f is an effective focal length of the optical lens.
6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0.2< SAG41/SAG42< 0.4;
SAG41 is a distance in the optical axis direction from a maximum clear aperture position of an object side surface of the fourth lens to an intersection point of the object side surface of the fourth lens and the optical axis, and SAG42 is a distance in the optical axis direction from a maximum clear aperture position of an image side surface of the fourth lens to an intersection point of the image side surface of the fourth lens and the optical axis.
7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: 0< (f 1-f 4)/f < 0.8;
wherein f is an effective focal length of the optical lens, and f4 is a focal length of the fourth lens.
8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation: -3.5<f4/R9<-2.0; or, -25<|f5|/R10<-2; or-5.0 mm2<f6*R12<-2.5 mm2；
Wherein f4 is a focal length of the fourth lens element, f5 is a focal length of the fifth lens element, f6 is a focal length of the sixth lens element, R9 is a radius of curvature of an image-side surface of the fourth lens element on an optical axis, R10 is a radius of curvature of an object-side surface of the fifth lens element on the optical axis, and R12 is a radius of curvature of an object-side surface of the sixth lens element on the optical axis.
9. A camera module, comprising a photo sensor chip and the optical lens of any one of claims 1-8, wherein the photo sensor chip is disposed on an image side of the optical lens.
10. An electronic device comprising a housing and the camera module of claim 9, wherein the camera module is disposed within the housing.
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical lens, a camera module and electronic equipment.
Background
With the development of science and technology, electronic products with a camera function are rapidly developed, the imaging quality requirements of consumers on the electronic products are higher and higher, and meanwhile, the structural characteristics of lightness, thinness and miniaturization gradually become the development trend of optical lenses. However, in the related art, as the performance and size of a common photosensitive Device such as a CCD (Charge-coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) Device are increased, it is difficult for the optical lens to meet the design requirement of miniaturization.
Disclosure of Invention
The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can meet the requirement of high-quality imaging of the optical lens and realize the miniaturization design of the optical lens.
In order to achieve the above object, in a first aspect, the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in order from an object side to an image side along an optical axis;
the first lens element with positive refractive power has a concave object-side surface at paraxial region and a concave object-side surface at circumference;
the second lens element with refractive power has a concave object-side surface at paraxial region and a concave object-side surface at periphery;
the third lens element with negative refractive power;
the fourth lens element with positive refractive power;
the fifth lens element with refractive power has a concave object-side surface at paraxial region thereof, and a concave object-side surface at periphery thereof;
the sixth lens element with negative refractive power;
the optical lens satisfies the following relation: 2mm-1<R2/(R3*f1)<20 mm-1；
Wherein R2 is a radius of curvature of an object-side surface of the first lens at an optical axis, R3 is a radius of curvature of an image-side surface of the first lens at the optical axis, and f1 is a focal length of the first lens.
The optical lens provided by the application comprises the first lens with positive refractive power, so that the convergence of field-of-view rays on an optical axis is facilitated, the concave surface is formed on the object side surface of the first lens, the optical lens is convenient for the rays to enter the optical lens and generate deflection under the condition that the optical lens has a large visual angle characteristic, the deflection angles born by other lenses on the image side of the first lens are reduced, and the deflection angles of the rays on the lenses are uniform; the second lens element with refractive power is beneficial to shortening the total length of the optical lens, and the object side surface of the second lens element is concave at a position near the optical axis and at a circumference, so that the field angle of the optical lens is further increased; the third lens with negative refractive power can counteract aberrations such as spherical aberration, coma aberration and the like generated by the first lens or the second lens; the fourth lens with positive refractive power is beneficial to improving and correcting the distortion and the field curvature aberration of the optical lens; the fifth lens element with refractive power has a concave object-side surface, which is beneficial to reducing the angle of light entering the image plane, reducing the aberration of the optical lens and reducing the sensitivity of the optical lens; the sixth lens element with negative refractive power can balance the aberration of the first five lens elements in the positive direction and easily ensure that the optical lens system has a reasonable back focus.
In the optical lens provided by the application, the optical lens is enabled to satisfy the following relational expression at the same time: 2mm-1<R2/(R3*f1)<20mm-1(ii) a When the object side surface of the first lens is a concave surface, the curvature radius of the object side surface of the first lens is reasonably controlled, so that light rays with larger field angle enter the optical lens, and the field angle of the optical lens is increased. On the basis, if the image side surface of the first lens element is set to be convex at the paraxial region and the focal length of the first lens element is controlled reasonably, the optical lens system can be miniaturized and corrected with spherical aberration.
As an alternative implementation, in an embodiment of the first aspect of the invention, the optical mirrorThe head satisfies the following relation: 50 degree<HFOV<55 deg., and 2mm-1<tan(HFOV)/SD11<2.5mm-1；
Wherein the HFOV is a half of a maximum angle of view of the optical lens, and the SD11 is a half of a maximum effective aperture of an object-side surface of the first lens.
By reasonably designing the ratio of the field angle of the optical lens to half of the maximum effective aperture of the object side surface of the first lens, namely, when the optical lens meets the relational expression, the optical lens can balance the characteristics of large field angle and miniaturization design. When the optical lens is lower than the lower limit of the above relation, the field of view acquired by the optical lens is small, which is not favorable for the optical lens to have wide-angle characteristics; when the optical lens exceeds the upper limit of the above relation, although the transverse dimension of the optical lens can be reduced, the field angle of the optical lens is too large, which easily results in poor definition of the image-forming edge, and it is difficult to correct the distortion aberration of the optical lens, which results in poor image-forming quality of the optical lens.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.7< R4/R5< 1.8;
wherein R4 is a curvature radius of an object side surface of the second lens at an optical axis, and R5 is a curvature radius of an image side surface of the second lens at the optical axis.
When the optical lens system satisfies the above relationship, the surface shape of the second lens element can be configured reasonably, so that the second lens element with a negative focal length can contribute to increase the field angle of the optical lens system, and the second lens element with a positive focal length can contribute to sharing the positive refractive power of the first lens element, thereby further shortening the total length of the optical lens system.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 3.5< (CT1+ CT2)/(T12+ T23) < 10;
wherein CT1 is an axial thickness of the first lens element, CT2 is an axial thickness of the second lens element, T12 is an axial distance between the first and second lens elements, and T23 is an axial distance between the second and third lens elements.
When the relation is satisfied, enough space is left between the three lenses during assembly, collision between the first lens and the second lens or between the second lens and the third lens is avoided, and in addition, the optical lens satisfying the relation increases the thicknesses of the first lens and the second lens on the optical axis as much as possible on the basis of ensuring the miniaturization design of the optical lens, thereby being beneficial to increasing the head depth of the optical lens and simultaneously reducing the sensitivity of the optical lens.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.0< f12/f < 2;
wherein f12 is a combined focal length of the first lens and the second lens, and f is an effective focal length of the optical lens.
The first lens and the second lens which satisfy the relational expression can strengthen the focusing capacity of the optical lens to light rays, so that the optical lens has good imaging quality, and simultaneously, the first lens and the second lens are combined with the meniscus shapes, so that the total length of the optical lens is favorably shortened, and the optical lens can obtain a larger field angle.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.2< SAG41/SAG42< 0.4;
SAG41 is a distance in the optical axis direction from a maximum clear aperture position of an object side surface of the fourth lens to an intersection point of the object side surface of the fourth lens and the optical axis, and SAG42 is a distance in the optical axis direction from a maximum clear aperture position of an image side surface of the fourth lens to an intersection point of the image side surface of the fourth lens and the optical axis.
When the relation is satisfied, the peripheral field aberration of the optical lens can be corrected, the imaging quality is satisfied, the shape of the fourth lens is reasonably configured, the manufacturing and molding of the fourth lens are facilitated, and the defect of poor molding is reduced. When the optical lens is lower than the lower limit of the relational expression, the surface shape of the image side surface of the fourth lens is excessively bent, so that poor molding is caused, and the manufacturing yield is influenced; when the optical lens exceeds the upper limit of the relational expression, the surface of the object side surface of the fourth lens is too smooth, the refractive power of the off-axis field is insufficient, and the distortion and the field curvature aberration are not favorably corrected.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0< (f 1-f 4)/f < 0.8;
wherein f is an effective focal length of the optical lens, f1 is a focal length of the first lens, and f4 is a focal length of the fourth lens.
When the above relation is satisfied, the refractive powers of the first lens element and the fourth lens element can be enhanced, and when the third lens element and the sixth lens element having negative refractive power are used in combination, the aberration of the optical lens assembly can be corrected, thereby improving the imaging quality, facilitating the shortening of the back focal length of the optical lens assembly, and further realizing the miniaturization design of the optical lens assembly.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -3.5< f4/R9< -2.0;
wherein f4 is a focal length of the fourth lens, and R9 is a radius of curvature of an image side surface of the fourth lens at an optical axis.
Through the relation between the focus of rational arrangement fourth lens and the curvature radius of the image side of fourth lens, when being applied to the optical lens module of making a video recording, can effectively control the incident angle that light enters into the sensitization chip of the module of making a video recording, improve optical lens's distortion, make optical lens possess less optical distortion, promote optical lens's formation of image quality.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -25< | f5|/R10< -2;
wherein f5 is a focal length of the fifth lens, and R10 is a radius of curvature of an object-side surface of the fifth lens at an optical axis.
When the conditions are met, the field angle of the optical lens can be effectively enlarged, the astigmatic aberration of the optical lens can be improved, and the imaging quality of the optical lens can be improved. When the optical lens is lower than the lower limit of the above relation, the refractive power provided by the fifth lens element is insufficient, so that the spherical aberration of the optical lens is too large; when the optical lens exceeds the upper limit of the relational expression, the object side surface of the fifth lens is not smooth, and the edge of the aperture is excessively bent, so that the stray light of the optical lens is increased, and the imaging quality is influenced.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: -5.0mm2<f6*R12<-2.5 mm2；
Wherein f6 is a focal length of the sixth lens, and R12 is a radius of curvature of an object-side surface of the sixth lens at an optical axis.
When the above relation is satisfied, the incident angle of the light entering the object side surface of the sixth lens element can be reduced by correcting the object side surface of the sixth lens element, the astigmatic aberration of the optical lens can be effectively corrected, the generation of parasitic ghost images can be avoided, the total length of the optical lens can be compressed, and the characteristic of thinning can be realized.
In a second aspect, the present invention discloses a camera module, which includes a photosensitive chip and the optical lens according to the first aspect, wherein the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens can correct distortion and reduce aberration, so that the optical lens has high imaging quality, has wide-angle characteristics, and meets the design requirements of lightness, thinness and miniaturization.
In a third aspect, the invention discloses an electronic device, which includes a housing and the camera module set according to the second aspect, wherein the camera module set is disposed in the housing. The electronic equipment with the camera module can correct distortion, reduce aberration, enable the optical lens to have high imaging quality, have wide-angle characteristics and meet the design requirements of lightness, thinness and miniaturization.
Compared with the prior art, the invention has the beneficial effects that:
according to the optical lens, the camera module and the electronic device provided by the embodiment of the invention, the optical lens adopts six lenses, the number of the used lenses is small, the refractive power and the surface shape of each lens are reasonably configured, and meanwhile, the optical lens meets the following relational expression: 2mm-1<R2/(R3*f1)<20 mm-1The field angle of the optical lens can be increased, the deflection angles of the light rays on the lenses are uniform, the aberration of the optical lens is corrected, the optical lens can have high imaging quality, the total length of the optical lens is effectively shortened, and the miniaturization design requirement is met.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens disclosed in a first embodiment of the present application;
fig. 2 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 3 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;
fig. 4 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 5 is a schematic structural diagram of an optical lens disclosed in the third embodiment of the present application;
fig. 6 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 7 is a schematic structural diagram of an optical lens disclosed in a fourth embodiment of the present application;
fig. 8 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 9 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;
fig. 10 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 11 is a schematic structural diagram of an optical lens disclosed in a sixth embodiment of the present application;
fig. 12 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 13 is a schematic structural diagram of the camera module disclosed in the present application;
fig. 14 is a schematic structural diagram of an electronic device disclosed in the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, 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", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.
The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.
Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, where the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6, which are disposed in order from an object side to an image side along an optical axis O. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 in sequence from the object side of the first lens L1, and is finally imaged on the imaging surface 101 of the optical lens 100. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with negative refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with positive refractive power, and the sixth lens element L6 with negative refractive power.
Further, the object-side surface S1 of the first lens element L1 can be concave at the paraxial region O and at the circumference, and the image-side surface S2 of the first lens element L1 can be convex or concave at the paraxial region O; the object-side surface S3 of the second lens element L2 can be concave at the paraxial region O and at the periphery, and the image-side surface S4 of the second lens element L2 can be convex or concave at the paraxial region O; the object-side surface S5 of the third lens element L3 can be convex or concave at the paraxial region O, and the image-side surface S6 of the third lens element L3 can be convex or concave at the paraxial region O; the object-side surface S7 of the fourth lens element L4 can be convex or concave at the paraxial region O, and the image-side surface S8 of the fourth lens element L4 can be convex or concave at the paraxial region O; the object-side surface S9 of the fifth lens element L5 can be concave at the paraxial region O and at the periphery thereof, and the image-side surface S10 of the fifth lens element L5 can be convex or concave at the paraxial region O; the object-side surface S11 of the sixth lens element L6 can be convex or concave at the paraxial region O, and the image-side surface S12 of the sixth lens element L6 can be convex or concave at the paraxial region O.
As can be seen from the above, the optical lens 100 includes the first lens element L1 with positive refractive power, which is favorable for enhancing the convergence of the light rays of the field of view on the optical axis O, and the object-side surface S1 of the first lens element L1 is concave, which is favorable for the light rays entering the optical lens 100 and deflecting under the condition that the optical lens 100 has the characteristic of large viewing angle, so as to reduce the deflection angles borne by other lens elements on the image side of the first lens element L1, and make the deflection angles of the light rays on each lens element more uniform; the second lens element L2 with refractive power is favorable for shortening the total length of the optical lens system 100, and the object-side surface S3 of the second lens element L2 is concave at a position near the optical axis O and at a circumference, so as to further increase the field angle of the optical lens system 100; the third lens element L3 with negative refractive power can cancel out aberrations such as spherical aberration and coma aberration generated by the first lens element L1 or the second lens element L2; the fourth lens element L4 with positive refractive power is favorable for improving the distortion and curvature of field aberration of the modified optical lens system 100; the fifth lens element L5 with refractive power has a concave object-side surface S9 of the fifth lens element L5, which is beneficial for reducing the angle of light entering the image plane, reducing the aberration of the optical lens 100, and reducing the sensitivity of the optical lens 100; the sixth lens element L6 with negative refractive power can balance the positive aberrations of the first five lens elements and easily ensure that the optical lens system 100 has a reasonable back focus.
In some embodiments, the optical lens 100 may be applied to electronic devices such as smart phones and smart tablets, and the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 may be made of plastic, so that the optical lens 100 has a good optical effect and at the same time has good portability. In addition, the plastic material is easier to process the lens, so that the processing cost of the optical lens can be reduced.
In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop or a field stop, which may be disposed between the object side of the optical lens 100 and the object side S1 of the first lens L1. It is understood that, in other embodiments, the stop 102 may also be disposed between two adjacent lenses, for example, between the second lens L2 and the third lens L3, and the arrangement is 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 L7, such as an infrared filter, disposed between the image side surface S12 of the sixth lens element L6 and the image plane 101 of the optical lens 100, so as to filter out light in other bands, such as visible light, and only allow infrared light to pass through, and therefore the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can image in a dark environment and other special application scenes and can obtain a better image effect.
In some embodiments, the optical lens 100 satisfies the following relationship: 2mm-1<R2/(R3*f1)<20mm-1. Wherein R2 is the radius of curvature of the object-side surface S1 of the first lens element L1 along the optical axis O, R3 is the radius of curvature of the image-side surface of the first lens element L1 along the optical axis O, and f1 is the focal length of the first lens element L1.
When the object-side surface S1 of the first lens L1 is concave, the curvature radius of the object-side surface S1 of the first lens L1 can be properly controlled, so that light rays with a larger field angle enter the optical lens 100, and the field angle of the optical lens 100 can be increased. In addition, if the image-side surface of the first lens element L1 is convex at the paraxial region O and the focal length of the first lens element L1 is appropriately controlled, it is possible to contribute to the miniaturization of the optical lens 100 and to the correction of the spherical aberration of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 50 degree<HFOV<55 deg., and 2mm-1<tan(HFOV)/SD11<2.5mm-1. The HFOV is half of the maximum angle of view of the optical lens 100, and SD11 is half of the maximum effective aperture of the object-side surface S1 of the first lens L1.
By properly designing the ratio of the angle of view of the optical lens 100 to half of the maximum effective aperture of the object-side surface S1 of the first lens element L1, that is, by making the optical lens 100 satisfy the above relational expression, the optical lens 100 can be balanced between the large-angle-of-view characteristic and the compact design. When the optical lens 100 is lower than the lower limit of the above relation, the visual field range acquired by the optical lens 100 is small, which is not favorable for the optical lens 100 to have the wide-angle characteristic; when the optical lens 100 exceeds the upper limit of the above relation, although the lateral size of the optical lens 100 can be reduced, the field angle of the optical lens 100 is too large, which tends to result in poor edge definition of the image, and it is difficult to correct the distortion aberration of the optical lens 100, which results in poor image quality of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.7< R4/R5< 1.8. Wherein R4 is the radius of curvature of the object-side surface S3 of the second lens element L2 along the optical axis O, and R5 is the radius of curvature of the image-side surface of the second lens element L2 along the optical axis O.
When the optical lens system 100 satisfies the above relation, the surface shape of the second lens element L2 can be properly configured such that the second lens element L2 with negative focal length can contribute to increase the field angle of the optical lens system 100, and the second lens element L2 with positive focal length can contribute to sharing the positive refractive power of the first lens element L1, thereby further shortening the total length of the optical lens system 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 3.5< (CT1+ CT2)/(T12+ T23) < 10. Wherein CT1 is the thickness of the first lens element L1 on the optical axis O, CT2 is the thickness of the second lens element L2 on the optical axis O, T12 is the distance between the first lens element L1 and the second lens element L2 on the optical axis O, and T23 is the distance between the second lens element L2 and the third lens element L3 on the optical axis O.
When the above relationship is satisfied, a sufficient space is left between the three lenses during assembly, so as to avoid collision between the first lens L1 and the second lens L2 or between the second lens L2 and the third lens L3, and in addition, the optical lens 100 satisfying the above relationship increases the thicknesses of the first lens L1 and the second lens L2 on the optical axis O as much as possible on the basis of ensuring the miniaturization design of the optical lens 100, thereby facilitating to increase the head depth of the optical lens 100 and reduce the sensitivity of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 1.0< f12/f < 2. Where f12 is the combined focal length of the first lens L1 and the second lens L2, and f is the effective focal length of the optical lens 100.
The first lens L1 and the second lens L2 satisfying the above relation can enhance the light focusing ability of the optical lens 100, so that the optical lens 100 has good image quality, and the combination of the meniscus shapes of the first lens L1 and the second lens L2 is beneficial to shortening the total length of the optical lens 100, so that the optical lens 100 can obtain a larger field angle.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< SAG41/SAG42< 0.4. SAG41 is the distance in the direction of the optical axis O from the maximum clear aperture position of the object-side surface S7 of the fourth lens L4 to the intersection point of the object-side surface S7 of the fourth lens L4 and the optical axis O, and SAG42 is the distance in the direction of the optical axis O from the maximum clear aperture position of the image-side surface of the fourth lens L4 to the intersection point of the image-side surface of the fourth lens L4 and the optical axis O.
When the above relational expression is satisfied, it is advantageous to correct the peripheral field aberration of the optical lens 100, and to appropriately configure the shape of the fourth lens L4 while satisfying the imaging quality, which is advantageous to manufacture and mold the fourth lens L4, and to reduce the defect of poor molding. When the optical lens system 100 is lower than the lower limit of the above relational expression, the surface profile of the image-side surface of the fourth lens L4 is excessively curved, which may cause poor molding and affect the manufacturing yield; when the optical lens system 100 exceeds the upper limit of the above relation, the object-side surface S7 of the fourth lens element L4 has a too smooth surface, and thus has insufficient refractive power for off-axis viewing, which is not favorable for correcting distortion and field curvature.
In some embodiments, the optical lens 100 satisfies the following relationship: 0< (f 1-f 4)/f < 0.8. Where f is the effective focal length of the optical lens 100, f1 is the focal length of the first lens L1, and f4 is the focal length of the fourth lens L4.
When the above-mentioned relational expressions are satisfied, the refractive powers of the first lens element L1 and the fourth lens element L4 can be enhanced, and when the third lens element L3 and the sixth lens element L6 having negative refractive power are combined, the aberration of the optical lens 100 can be corrected, thereby improving the imaging quality, and the optical lens 100 can be advantageously shortened in back focus, thereby further realizing the miniaturization design of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: -3.5< f4/R9< -2.0. Where f4 is the focal length of the fourth lens L4, and R9 is the radius of curvature of the image-side surface of the fourth lens L4 at the optical axis O.
By reasonably configuring the relationship between the focal length of the fourth lens L4 and the curvature radius of the image side surface of the fourth lens L4, when the optical lens 100 is applied to a camera module, the incident angle of light rays entering the camera module to a photosensitive chip can be effectively controlled, the distortion of the optical lens 100 is improved, the optical lens 100 has smaller optical distortion, and the imaging quality of the optical lens 100 is improved.
In some embodiments, the optical lens 100 satisfies the following relationship: -25< | f5|/R10< -2. Where f5 is the focal length of the fifth lens L5, and R10 is the radius of curvature of the object-side surface S9 of the fifth lens L5 at the optical axis O.
When the above conditions are satisfied, the field angle of the optical lens 100 can be effectively enlarged, and simultaneously, the astigmatic aberration of the optical lens 100 can be favorably improved, and the imaging quality of the optical lens 100 can be improved. When the optical lens system 100 is lower than the lower limit of the above relationship, the refractive power provided by the fifth lens element L5 is insufficient, so that the spherical aberration of the optical lens system 100 is too large; when the optical lens 100 exceeds the upper limit of the above relational expression, the object-side surface S9 of the fifth lens L5 has an uneven surface, and the edge of the aperture is excessively bent, so that stray light of the optical lens 100 is increased, and the imaging quality is affected.
In some embodiments, the optical lens 100 satisfies the following relationship: -5.0mm2<f6*R12<-2.5 mm2. Where f6 is the focal length of the sixth lens L6, and R12 is the radius of curvature of the object-side surface S11 of the sixth lens L6 at the optical axis O.
When the above relationship is satisfied, the correction of the object-side surface S11 of the sixth lens element L6 can reduce the incident angle of the light beam entering the object-side surface S11 of the sixth lens element L6, so that the astigmatic aberration of the optical lens 100 can be effectively corrected, the generation of the parasitic ghost image can be avoided, and the total length of the optical lens 100 can be advantageously compressed to realize the feature of thin type.
The optical lens 100 of the present embodiment will be described in detail with reference to specific parameters.
First embodiment
The optical lens 100 disclosed in the first embodiment of the present application is shown in fig. 1, and the optical lens 100 includes a stop 102, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 and a filter L7, which are disposed in order from an object side to an image side along an optical axis O, where the first lens element L1 has positive refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has negative refractive power.
Further, the object-side surface S1 and the image-side surface S2 of the first lens element L1 are respectively concave and convex at the paraxial region O, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are respectively concave and convex at the paraxial region O, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are respectively convex and concave at the paraxial region O, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are respectively concave and convex at the paraxial region O, the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are respectively concave and convex at the paraxial region O, and the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are respectively convex and concave at the paraxial region O. The object-side surface S1 and the image-side surface S2 of the first lens element L1 are concave and convex, respectively, at the circumference, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are concave and convex, respectively, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are concave and concave, respectively, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex and concave, respectively, the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave and convex, respectively, and the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are concave and convex, respectively, at the circumference.
Specifically, taking as an example the effective focal length f =2.62mm of the optical lens 100, half of the maximum field angle HFOV =51.3 ° of the optical lens 100, and the total optical length TTL =4.452mm of the optical lens 100, other parameters of the optical lens 100 are given by table 1 below. The elements of the optical lens 100 from the object side to the image side along the optical axis O are arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller number of surfaces is the object side surface of the lens, and the surface with the larger number of surfaces is the image side surface of the lens, and for example, the numbers 2 and 3 correspond to the object side surface S1 and the image side surface S2 of the first lens L1, respectively. The Y radius in table 1 is the radius of curvature of the object-side or image-side surface of the respective surface number at the paraxial region O. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O from the stop 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O), the direction from the object side to the image side of the last lens of the first lens L1 is the positive direction of the optical axis O, when the value is negative, it indicates that the stop 102 is disposed on the image side of the vertex of the next surface, and if the thickness of the stop 102 is a positive value, the stop 102 is disposed on the object side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the reference wavelength of the focal length of each lens, the refractive index of each lens material, and the abbe number in table 1 was 587.5618 nm.
TABLE 1
In the first embodiment, the object-side surface and the image-side surface of any one of the first lens L1 through the sixth lens L6 are aspheric, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =1/R (i.e., paraxial curvature c is the inverse of radius R of Y in table 1 above); k is a conic coefficient; ai is a correction coefficient corresponding to the high-order term of the ith aspheric term. Table 2 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the respective aspherical mirror surfaces S1-S16 in the first embodiment.
TABLE 2
Referring to fig. 2 (a), fig. 2 (a) shows a longitudinal spherical aberration curve of the optical lens 100 in the first embodiment at 656.2725nm, 587.5618nm and 486.1327 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.
Referring to fig. 2 (B), fig. 2 (B) is a graph of astigmatism of light of the optical lens 100 in the first embodiment at a wavelength of 587.5618 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 2 that the astigmatism of the optical lens 100 is well compensated at this wavelength.
Referring to fig. 2 (C), fig. 2 (C) is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 587.5618 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height in mm. As can be seen from (C) in fig. 2, the distortion of the optical lens 100 is well corrected at a wavelength of 587.5618 nm.
Second embodiment
As shown in fig. 3, the optical lens 100 disclosed in the second embodiment of the present application includes an aperture stop 102, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 and an optical filter L7, which are sequentially disposed along an optical axis O from an object side to an image side, wherein the first lens element L1 has positive refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has positive refractive power, and the sixth lens element L6 has negative refractive power.
It is understood that the refractive powers of the lenses of the optical lens 100 in the second embodiment, the shapes of the object-side surface and the image-side surface of the lenses at the paraxial region O and the circumference are the same as those of the optical lens 100 in the first embodiment, and therefore, the description thereof is omitted.
Specifically, taking as an example the effective focal length f =2.66mm of the optical lens 100, half of the maximum field angle HFOV =51.1 ° of the optical lens 100, and the total optical length TTL =4.51mm of the optical lens 100, other parameters of the optical lens 100 are given in table 3 below, and the definitions of the respective parameters can be derived from the description of the foregoing embodiments. It is understood that the units of the radius Y, thickness, and focal length in table 3 are all mm. And the reference wavelength of the focal length of each lens, the refractive index of each lens material, and the abbe number in table 3 was 587.5618 nm.
TABLE 3
In the second embodiment, table 4 gives the high-order term coefficients that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 4
Referring to fig. 4, as shown in the graph of (a) longitudinal spherical aberration, (B) astigmatism of light beam, and (C) distortion of fig. 4, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.
Third embodiment
As shown in fig. 5, the optical lens 100 disclosed in the third embodiment of the present application includes an aperture stop 102, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 and an optical filter L7, which are sequentially disposed along an optical axis O from an object side to an image side, wherein the first lens element L1 has positive refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has negative refractive power.
It is understood that the shapes of the object-side surface and the image-side surface of each lens of the optical lens 100 in the third embodiment at the paraxial region O are the same as those of the optical lens 100 in the first embodiment, and therefore, the description thereof is omitted.
The object-side surface S1 and the image-side surface S2 of the first lens element L1 are concave and convex, respectively, at the circumference, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are concave and convex, respectively, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are concave and concave, respectively, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex, respectively, the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave and convex, respectively, and the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are concave and convex, respectively, at the circumference.
Specifically, taking as an example the effective focal length f =2.56mm of the optical lens 100, half of the maximum field angle HFOV =52.3 ° of the optical lens 100, and the total optical length TTL =4.449mm of the optical lens 100, other parameters of the optical lens 100 are given in table 5 below, and the definitions of the respective parameters can be derived from the description of the foregoing embodiments. It is understood that the units of the radius Y, thickness, and focal length in table 5 are mm. And the reference wavelength of the focal length of each lens, the refractive index of each lens material, and the abbe number in table 5 was 587.5618 nm.
TABLE 5
In the third embodiment, table 6 gives the high-order term coefficients that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 6
Referring to fig. 6, as shown in the graph of (a) longitudinal spherical aberration, (B) astigmatism of light beam, and (C) distortion of fig. 6, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 6 (a), fig. 6 (B), and fig. 6 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.
Fourth embodiment
A schematic structural diagram of an optical lens 100 disclosed in the fourth embodiment of the present application is shown in fig. 7, where the optical lens 100 includes an aperture stop 102, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 and an optical filter L7, which are arranged in sequence from an object side to an image side along an optical axis O, the first lens element L1 has positive refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has positive refractive power, and the sixth lens element L6 has negative refractive power.
It is understood that the shapes of the object-side surface and the image-side surface of each lens of the optical lens 100 in the fourth embodiment at the paraxial region O are the same as those of the optical lens 100 in the first embodiment, and therefore, the description thereof is omitted. The object-side surface S1 and the image-side surface S2 of the first lens element L1 are concave and convex, respectively, at the circumference, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are concave and convex, respectively, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave, respectively, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex, respectively, the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave and convex, respectively, and the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are concave and convex, respectively, at the circumference.
Specifically, taking as an example the effective focal length f =2.62mm of the optical lens 100, half of the maximum field angle HFOV =51.6 ° of the optical lens 100, and the total optical length TTL =4.448mm of the optical lens 100, other parameters of the optical lens 100 are given by table 7 below, and the definitions of the respective parameters therein can be derived from the description of the foregoing embodiments. It is understood that the units of the radius Y, thickness, and focal length in table 7 are mm. And the reference wavelength of the focal length of each lens, the refractive index of each lens material, and the abbe number in table 7 was 587.5618 nm.
TABLE 7
In the fourth embodiment, table 8 gives the high-order term coefficients that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 8
Referring to fig. 8, as shown in the graph of (a) longitudinal spherical aberration, (B) astigmatism of light beam, and (C) distortion of fig. 8, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 8 (a), fig. 8 (B), and fig. 8 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.
Fifth embodiment
As shown in fig. 9, the optical lens 100 disclosed in the fifth embodiment of the present application includes an aperture stop 102, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 and an optical filter L7, which are sequentially disposed along an optical axis O from an object side to an image side, wherein the first lens element L1 has positive refractive power, the second lens element L2 has positive refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has positive refractive power, and the sixth lens element L6 has negative refractive power.
It is understood that the shapes of the object-side surface and the image-side surface of each lens of the optical lens 100 in the fifth embodiment at the paraxial region O are the same as those of the optical lens 100 in the first embodiment, and therefore, the description thereof is omitted. The object-side surface S1 and the image-side surface S2 of the first lens element L1 are concave and convex at the circumference, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are concave and convex at the circumference, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are concave and convex at the circumference, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are concave and convex at the circumference, the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave and convex at the circumference, and the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are concave and convex at the circumference.
Specifically, taking as an example the effective focal length f =2.66mm of the optical lens 100, half of the maximum field angle HFOV =51.1 ° of the optical lens 100, and the total optical length TTL =4.538mm of the optical lens 100, other parameters of the optical lens 100 are given in table 9 below, and the definitions of the respective parameters can be derived from the description of the foregoing embodiments. It is understood that the units of the radius Y, thickness, and focal length in table 9 are mm. And the reference wavelength of the focal length of each lens, the refractive index of each lens material, and the abbe number in table 9 was 587.5618 nm.
TABLE 9
In the fifth embodiment, table 10 gives the high-order term coefficients that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
Watch 10
Referring to fig. 10, as shown in the graph of (a) longitudinal spherical aberration, (B) astigmatism of light beam, and (C) distortion of fig. 10, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 10 (a), fig. 10 (B), and fig. 10 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.
Sixth embodiment
A schematic structural diagram of an optical lens 100 disclosed in the sixth embodiment of the present application is shown in fig. 11, where the optical lens 100 includes an aperture stop 102, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 and an optical filter L7, which are arranged in sequence from an object side to an image side along an optical axis O, the first lens element L1 has positive refractive power, the second lens element L2 has negative refractive power, the third lens element L3 has negative refractive power, the fourth lens element L4 has positive refractive power, the fifth lens element L5 has negative refractive power, and the sixth lens element L6 has negative refractive power.
It is understood that the shapes of the object-side surface and the image-side surface of each lens of the optical lens 100 in the sixth embodiment at the paraxial region O are the same as those of the optical lens 100 in the first embodiment, and therefore, the description thereof is omitted. The object-side surface S1 and the image-side surface S2 of the first lens element L1 are concave and convex, respectively, the object-side surface S3 and the image-side surface S4 of the second lens element L2 are concave and convex, respectively, the object-side surface S5 and the image-side surface S6 of the third lens element L3 are convex and concave, respectively, the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are convex and convex, respectively, the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are concave and convex, respectively, and the object-side surface S11 and the image-side surface S12 of the sixth lens element L6 are concave and convex, respectively.
Specifically, taking as an example the effective focal length f =2.66mm of the optical lens 100, half of the maximum field angle HFOV =51.1 ° of the optical lens 100, and the total optical length TTL =4.472mm of the optical lens 100, other parameters of the optical lens 100 are given in table 11 below, and the definitions of the respective parameters can be derived from the description of the foregoing embodiments. It is understood that the units of the radius Y, thickness, and focal length in table 11 are mm. And the reference wavelength of the focal length of each lens, the refractive index of each lens material, and the abbe number in table 11 is 587.5618 nm.
TABLE 11
In the sixth embodiment, table 12 gives the high-order term coefficients that can be used for each aspherical mirror surface in the sixth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 12
Referring to fig. 12, as shown in the graph of (a) longitudinal spherical aberration, (B) astigmatism of light beam, and (C) distortion of fig. 12, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. In addition, as for the wavelengths corresponding to the curves in fig. 12 (a), fig. 12 (B), and fig. 12 (C), the contents described in the first embodiment with respect to fig. 2 (a), fig. 2 (B), and fig. 2 (C) may be referred to, and details thereof are not repeated herein.
Referring to table 13, table 13 summarizes ratios of the relations in the first embodiment to the sixth embodiment of the present application.
Watch 13
Referring to fig. 13, the present invention discloses a camera module 200, wherein the camera module 200 includes a photo sensor 201 and the optical lens 100, and the photo sensor 201 is disposed at an image side of the optical lens 100. The camera module 200 having the optical lens 100 can correct distortion and reduce aberration, so that the optical lens 100 has high imaging quality, has wide-angle characteristics, and meets the design requirements of being light, thin and small.
Referring to fig. 14, the present invention discloses an electronic device 300, wherein the electronic device 300 includes a housing 301 and the camera module 200, and the camera module 200 is disposed in the housing 301. The electronic device 300 with the camera module 200 can correct distortion and reduce aberration, so that the optical lens 100 has high imaging quality, and has wide-angle characteristics, and the design requirements of lightness, thinness and miniaturization are met, so that when the camera module 200 is packaged under the screen of the electronic device 300, the opening size of the screen is favorably reduced, and the screen occupation ratio of the electronic device 300 is improved.
The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are described in detail above, and the principle and the embodiments of the present invention are explained in detail herein by applying specific examples, and the description of the embodiments above is only used to help understanding the optical lens, the camera module and the electronic device and the core ideas thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
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