CN113866956B

CN113866956B - Optical lens system, image capturing device, and electronic apparatus

Info

Publication number: CN113866956B
Application number: CN202111284927.9A
Authority: CN
Inventors: 陈嘉伟; 李响; 王文涛; 张海裕
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-11-01
Filing date: 2021-11-01
Publication date: 2023-05-30
Anticipated expiration: 2041-11-01
Also published as: CN113866956A; WO2023071480A1

Abstract

The application provides an optical lens system, an image capturing device and electronic equipment. The application provides an optical lens system includes from the object side to the image side in proper order: a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power; wherein the optical lens system satisfies the following conditional expression: tan (HFOV) |/TTL >0.13; and 0.6< f1/f <1.0; -4.0< f2/f < -1; f3/f < -1; wherein, HFOV is half of the horizontal angle of view of the optical lens system, TTL is the length of the object-side surface of the first lens element to the image plane on the optical axis, f is the effective focal length of the optical lens system, f1 is the effective focal length of the first lens element, f2 is the effective focal length of the second lens element, and f3 is the effective focal length of the third lens element. The optical lens system has good imaging effect while ensuring miniaturization and ultrathin effect, realizes the characteristic of ultra-large wide angle and improves imaging quality.

Description

Optical lens system, image capturing device, and electronic apparatus

Technical Field

The present disclosure relates to optical lens technology, and more particularly, to an optical lens system, an image capturing device with the optical lens, and an electronic device with the image capturing device.

Background

With the development of technologies such as portable intelligent electronic products, automatic driving of automobiles, man-machine interfaces and games, industrial machine vision and measurement, security monitoring, etc., higher requirements are put forward on technologies of photographic lenses on these devices so as to satisfy functions of each device. The existing photographic lens generally optimizes all light rays in a diaphragm so as to enable all incident light rays to achieve a focusing effect on hardware; however, the conventional photographic lens system is too long in total length and cannot meet the requirement of miniaturization of the apparatus.

Disclosure of Invention

In view of this, the embodiments of the present application provide an optical lens system, which is short in total system, and can well meet the requirement of the image capturing device for miniaturization; it is also necessary to provide an image capturing apparatus using the above optical lens system; and, it is also necessary to provide an electronic apparatus using the above-described image capturing device.

The embodiment of the application provides an optical lens system, which sequentially includes, from an object side to an image side:

a first lens element with positive refractive power;

a second lens element with negative refractive power;

a third lens element with negative refractive power;

a fourth lens element with positive refractive power;

a fifth lens element with positive refractive power; a kind of electronic device with high-pressure air-conditioning system

A sixth lens element with negative refractive power;

wherein the optical lens system satisfies the following conditional expression:

tan (HFOV) |/TTL >0.13; and 0.6< f1/f <1.0; -4.0< f2/f < -1; f3/f < -1;

wherein HFOV is half of the horizontal angle of view of the optical lens system, TTL is the length of the object-side surface to the imaging surface of the first lens element on the optical axis, f is the effective focal length of the optical lens system, f1 is the effective focal length of the first lens element, f2 is the effective focal length of the second lens element, and f3 is the effective focal length of the third lens element.

According to the optical lens system, a part of light rays in the middle of the diaphragm are subjected to strong optimization, so that the part of light rays, close to an optical axis, of the optical lens system reach a better strong focusing state, and the optical lens system has a better imaging effect; the space height of the optical lens system can be greatly reduced under the condition of the same aperture, namely the total length of the optical lens system is shorter; the clear image can be obtained by combining the light rays of the optical lens system with an image processing algorithm at the rear end. Therefore, miniaturization and ultrathin of the optical lens system can be achieved, and the angle of view of the optical lens system is improved compared with the prior art, so that the optical lens system has a good imaging effect while miniaturization and ultrathin are guaranteed, the characteristic of an ultra-large wide angle is achieved, and imaging quality is improved.

In some embodiments, the object side surface and the image side surface of any one of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are aspheric, and the aspheric formula of the surface type z of each aspheric lens element is as follows:

wherein z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c=1/R, and the paraxial curvature c is the reciprocal of the radius of curvature R; k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order.

In some embodiments, the object-side surface of the first lens is convex and the image-side surface of the first lens is concave.

In some embodiments, the object-side surface of the second lens is concave at a paraxial region; the image side surface of the second lens is a concave surface.

In some embodiments, the object-side surface of the third lens is concave and the image-side surface of the third lens is convex.

In some embodiments, the object-side surface of the fourth lens is concave and the image-side surface of the fourth lens is convex.

In some embodiments, the object-side surface of the fifth lens is convex at a paraxial region; the image side surface of the fifth lens is concave at a paraxial region.

In some embodiments, the object-side surface of the sixth lens is concave at a paraxial region; the image side surface of the sixth lens is concave at a paraxial region.

In some embodiments, the optical lens system further comprises an aperture that surrounds the object-side surface of the first lens.

In some embodiments, the optical lens system satisfies the following conditional expression:

80°≤HFOV≤95°；

wherein the HFOV is half the horizontal field angle of the optical lens system.

5.7mm≤TTL≤6.1mm；

wherein TTL is the length from the object side surface to the imaging surface of the first lens on the optical axis.

5.2mm≤f≤5.5mm；

wherein f is the focal length of the optical lens system.

4.0mm≤f1≤6.0mm；

wherein f1 is the effective focal length of the first lens.

-25.0mm≤f2≤-5.0mm；

wherein f2 is the effective focal length of the second lens.

-100.0mm≤f3≤-40.0mm；

wherein f3 is an effective focal length of the third lens.

The embodiment of the application also provides an image capturing device, which comprises the optical lens system and a photosensitive element, wherein the photosensitive element is positioned at the image side of the optical lens system.

The imaging device has small thickness and can be used for preparing an ultrathin imaging device; the imaging device has a wide angle of view and imaging quality while ensuring miniaturization.

The embodiment of the application also provides electronic equipment, which comprises an equipment main body and the image capturing device, wherein the image capturing device is arranged on the equipment main body.

The imaging device of the electronic equipment is small in thickness, and is beneficial to reducing the volume of the electronic equipment.

Drawings

In order to more clearly illustrate the constructional features and efficacy of the present application, a detailed description thereof will be given below with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic view of the structure of an optical lens system according to a first embodiment of the present application;

FIG. 2 is a graph of longitudinal spherical aberration of the optical lens system of FIG. 1;

FIG. 3 is a field curvature graph of the optical lens system of FIG. 1;

FIG. 4 is a F-Tan (Theta) distortion plot of the optical lens system of FIG. 1;

FIG. 5 is a schematic view of the structure of an optical lens system according to a second embodiment of the present application;

FIG. 6 is a graph of longitudinal spherical aberration of the optical lens system of FIG. 5;

FIG. 7 is a field curvature graph of the optical lens system of FIG. 5;

FIG. 8 is a F-Tan (Theta) distortion plot of the optical lens system of FIG. 5;

fig. 9 is a schematic structural diagram of an image capturing device according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It is noted that reference herein to "an embodiment" or "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The terms "first," "second," and the like, herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" means two or more, unless specifically defined otherwise.

Referring to fig. 1 and 5 together, the optical lens system of the embodiment of the present application is suitable for a super wide angle lens, and in particular, the optical lens system is suitable for a lens of an imaging device such as a mobile phone, a computer, a tablet computer, a vehicle-mounted device, a monitoring device, a security device, a medical device, a game console, a robot, and the like. The optical lens system sequentially comprises, from an object side to an image side, a first lens element 20 with positive refractive power, a second lens element 30 with negative refractive power, a third lens element 40 with negative refractive power, a fourth lens element 50 with positive refractive power, a fifth lens element 60 with positive refractive power, and a sixth lens element 80 with negative refractive power; wherein the optical lens system satisfies the following conditional expression:

tan (HFOV) |/TTL >0.13; and 0.6< f1/f <1.0; -4.0< f2/f < -1; f3/f < -1;

wherein the HFOV is half the horizontal angle of view of the optical lens system, and in particular, half the maximum angle of view of the ultra-wide angle lens; TTL is the length from the object side surface 22 of the first lens element 20 to the imaging surface 102 on the optical axis L, f is the focal length of the optical lens system, f1 is the effective focal length of the first lens element 20, f2 is the effective focal length of the second lens element 30, and f3 is the effective focal length of the third lens element 40.

The |tan (HFOV) |/TTL >0.13, and 0.6< f1/f <1.0 in the optical lens system of the present application; -4.0< f2/f < -1; f3/f < -1; therefore, the optical lens system can strongly optimize the part of light rays in the middle of the diaphragm, the part of light rays of the optical lens system close to the optical axis reach a better strong focusing state, and the optical lens system can weakly focus the other part of light rays around the diaphragm, so that the optical lens system has a better imaging effect; the spatial height of the optical lens system can be greatly reduced under the condition of the same aperture, namely the total length of the optical lens system is shorter, namely TTL ratio is shorter; the light rays passing through the optical lens system can be combined with an image processing algorithm of the rear end to obtain a clear image, and the image processing algorithm comprises a deconvolution algorithm, a deep learning algorithm and the like. Specifically, the TTL ratio can be reduced from about 0.65 to about 0.57 in the prior art; the TTL ratio is equal to the ratio of the total system length of the optical lens system to the sensor diagonal length, i.e., TTL ratio = total system length of the optical lens system/sensor diagonal length. Therefore, miniaturization and ultrathin of the optical lens system can be achieved, and the angle of view of the optical lens system is improved compared with the prior art, so that the optical lens system has a good imaging effect while miniaturization and ultrathin are guaranteed, the characteristic of an ultra-large wide angle is achieved, and imaging quality is improved.

In the optical lens system described above, the first lens 20 may be made of glass or plastic, preferably glass; the first lens element 20 has an object-side surface 22 and an image-side surface 24, and the first lens element 20 has positive refractive power. The object-side surface 22 of the first lens element 20 is convex, and the image-side surface 24 of the first lens element 20 is concave. The first lens 20 can replace cover glass at the front side of the ultra-wide angle lens, so that the internal space occupied by an optical lens system in the electronic equipment is reduced, the space of the electronic equipment can be saved, the miniaturization of the electronic equipment is facilitated, and the layout of other elements in the electronic equipment is facilitated. The image side surface 24 is concave, so that light reflected by the photographed object can be effectively acquired by the optical lens system, and convergence of light of the external field of view of the optical axis L can be enhanced, and the light enters an imaging surface of the optical lens system. In some embodiments, the object-side surface 22 of the first lens 20 is convex; the image side surface 24 of the first lens element 20 is concave at a paraxial region and flat at a peripheral region.

In the optical lens system described above, the second lens element 30 may be made of glass or plastic, and has an object-side surface 32 and an image-side surface 34; the second lens element 30 has negative refractive power. In an embodiment, the object-side surface 32 of the second lens element 30 is concave at the paraxial region L; the image side surface 34 of the second lens element 30 is concave. The diameter of the second lens 30 is smaller than that of the first lens 20, and the projection of the outer peripheral wall of the second lens 30 onto the image side surface 24 of the first lens 20 along the optical axis L is located on the concave surface of the image side surface 24. In some embodiments, the object-side surface 32 of the second lens 30 is concave at the paraxial region L and convex at the peripheral region. In some embodiments, the diameter of the second lens 30 may also be equal to the diameter of the first lens 20, and the image-side surface 24 of the first lens 20 is concave.

In the optical lens system described above, the third lens element 40 can be made of glass or plastic, and has an object-side surface 42 and an image-side surface 44; the third lens element 40 has negative refractive power. The object side surface 42 of the third lens element 40 is concave, and the image side surface 44 of the third lens element 40 is convex; in one embodiment, the object side surface 42 is concave at the paraxial region L and planar at the peripheral region L. The diameter of the third lens 40 is equal to the diameter of the second lens 30.

In the optical lens system described above, the fourth lens element 50 may be made of glass or plastic, and has an object-side surface 52 and an image-side surface 54; the fourth lens element 50 has positive refractive power. The object-side surface 52 of the fourth lens element 50 is concave, and the image-side surface 54 of the fourth lens element 50 is convex. The diameter of the fourth lens element 50 is larger than the diameter of the third lens element 40, and in particular, the projection of the outer circumferential wall of the third lens element 40 onto the object-side surface 52 of the fourth lens element 50 along the optical axis L is located on a concave surface of the object-side surface 52. In some embodiments, the object side surface 52 is concave at the paraxial region L and may be planar at the circumference.

In the optical lens system described above, the fifth lens element 60 can be made of glass or plastic, and has an object-side surface 62 and an image-side surface 64; the fifth lens element 60 has positive refractive power. The object side surface 62 of the fifth lens element 60 is convex at a paraxial region L; the image-side surface 64 of the fifth lens element 60 is concave at the paraxial region L. The diameter of the fifth lens element 60 is larger than that of the fourth lens element 50, and the projection of the outer peripheral wall of the fourth lens element 50 onto the object-side surface 62 of the fifth lens element 60 along the optical axis L is located on the concave surface of the object-side surface 62. In some embodiments, the fifth lens element 60 has a concave surface at the circumference of the object-side surface 62 and a convex surface at the circumference of the image-side surface 64. In some embodiments, the object-side surface 62 of the fifth lens element 60 is convex at the paraxial region L, and is concave at the circumference, followed by convex and concave at the last.

In the optical lens system described above, the sixth lens element 70 can be made of glass or plastic, and has an object-side surface 72 and an image-side surface 74; the sixth lens element 70 with negative refractive power. The object-side surface 72 of the sixth lens 70 is concave at the paraxial region L; the image-side surface 74 of the sixth lens element 70 is concave at a paraxial region L and convex at a periphery of the image-side surface 74. The diameter of the sixth lens 70 is larger than the diameter of the fifth lens 60, and the projection of the outer peripheral wall of the sixth lens 70 onto the object-side surface 72 of the seventh lens 70 along the optical axis L is located on the convex surface of the object-side surface 72. In some embodiments, the object-side surface 72 of the sixth lens 70 is concave at the paraxial region L and convex at the peripheral region. In some embodiments, the object-side surface 72 of the seventh lens 70 is concave at the paraxial region L, convex at the peripheral region and then planar.

The collocation design of the first lens 20, the second lens 30, the third lens 40, the fourth lens 50, the fifth lens 60 and the sixth lens 70 in the application is used for optimizing the aberration of the optical lens system, so that the aberration of the optical lens system is optimized to the minimum, and the imaging quality of the optical lens system is improved; and the total length of the optical lens system is shortened so as to meet the development trend of ultrathin and miniaturized optical lens systems.

In some embodiments, glass lenses and plastic lenses are included in the first, second, third, fourth, fifth, and

sixth lenses

20, 30, 40, 50, 60, and 70. For example, the first lens 20 is a glass lens; the second lens 30, the third lens 40, the fourth lens 50, the fifth lens 60, and the sixth lens 70 are all plastic lenses. The first lens 20 closest to the object side is a glass lens, which can better withstand the environmental temperature influence of the object side, and the second lens 30, the third lens 40, the fourth lens 50, the fifth lens 60 and the sixth lens 70 are plastic lenses, so that the weight of the optical lens system can be well reduced and the production cost can be reduced. In addition, the optical lens system in which the glass lens and the plastic lens are mixed has higher light transmittance and more stable chemical properties than an optical lens system including only the plastic lens, and can improve imaging quality at different light-dark contrast ratios.

In some embodiments, the first lens 20, the second lens 30, the third lens 40, the fourth lens 50, the fifth lens 60, and the sixth lens 70 are all aspheric lenses. The aspheric lens is beneficial to correcting aberration of the optical lens system and improving imaging quality of the optical lens system. Can be easily manufactured into a shape other than a spherical surface, more control variables are obtained, and good imaging is obtained by a small number of lenses, so that the number of lenses is reduced, and miniaturization is satisfied. An "aspherical lens" refers to a lens having at least one surface that is aspherical.

When the object-side and/or image-side surfaces of the first lens element 20, the second lens element 30, the third lens element 40, the fourth lens element 50, the fifth lens element 60 and the sixth lens element 70 are aspheric, the surface profile z of each aspheric lens element can be defined by, but not limited to, the following aspheric formulas:

/>

wherein z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspherical surface, c=1/R (paraxial curvature c is the inverse of the radius of curvature R); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order.

In the foregoing optical lens system of the present application, preferably, the optical lens system further includes an aperture stop 80, and specifically, the aperture stop 80 is disposed around the object side surface 22 of the first lens 20. Preferably, the optical lens system has an aperture value of 1.88, wherein the optical lens system has a center with a strongly focused aperture value of 2.35.

In the foregoing optical lens system of the present application, preferably, the optical lens system further includes an infrared cut filter 90. The infrared cut filter 90 is located between the sixth lens 70 and the imaging surface 102. The ir cut filter 90 has a first face 92 and a second face 94. The infrared cut-off filter 90 may be made of glass or an optical film, and the infrared cut-off filter 90 is used for cutting off infrared rays and realizing high transmission of visible light, thereby blocking infrared light interfering with imaging quality, preventing the infrared rays from passing through a lens of an imaging device to cause picture distortion, and enabling the formed image to more accord with human eyes.

In the foregoing optical lens system, preferably, the optical lens system further includes a protective glass, and the protective glass covers the sensor; the protective glass is used for protecting the inductor.

80°≤HFOV≤95°；

wherein the HFOV is half the horizontal field angle of the optical lens system. In particular, the HFOV's of the optical lens systems described herein may be, but are not limited to, 86, 88.2, etc.; more specifically, the optical lens system described herein satisfies: the HFOV is greater than or equal to 80 DEG and less than or equal to 95 DEG, i.e., 80 DEG to 95 DEG.

When the HFOV is greater than 80, the field angle of the optical lens system is greater than 160 to accommodate the need for an ultra wide angle lens.

5.7mm≤TTL≤6.1mm；

wherein TTL is the length from the object side surface 22 of the first lens element 20 to the image plane 102 on the optical axis L.

That is, TTL can be any value between 5.7mm and 6.1mm, such as 5.95mm, 5.85mm, etc.

When TTL is less than 6.1mm, the total length of the optical lens system is compressed, and the requirement of ultrathin imaging device can be well met. The total length of the optical lens system is smaller than 6.1mm, and the requirement of ultrathin imaging device can be well met.

In one embodiment, the TTL of the optical lens system is 5.95mm.

5.2mm≤f≤5.5mm；

wherein f is the focal length of the optical lens system.

That is, f may be any value between 5.2mm and 5.5mm, such as 5.36mm, 5.40mm, etc.

In one embodiment, the optical lens system has an f of 5.36mm.

When f is less than 5.5mm, the total length of the optical lens system is fully compressed, and the requirement of ultrathin imaging device can be well met.

4.0mm≤f1≤6.0mm；

wherein f1 is the effective focal length of the first lens.

That is, f1 may be any value between 4.0mm and 6.0mm, e.g., f1 may be 4.7mm, 5.0mm, etc.

In one embodiment, f1 of the optical lens system is 4.7mm.

In one embodiment, the optical lens system satisfies the following conditional expression:

-25.0mm≤f2≤-5.0mm；

wherein f2 is the effective focal length of the second lens.

That is, f2 may be any value between-25.0 mm and-5.0 mm, e.g., f2 may be-16.1 mm, -20.0mm, etc.

In one embodiment, f2 of the optical lens system is-16.1 mm.

-100.0mm≤f3≤-40.0mm；

wherein f3 is an effective focal length of the third lens.

That is, f3 may be any value between-100.0 mm and-40.0 mm, such as f3 may be-64.6 mm, -75.0mm, and so on.

In one embodiment, f3 of the optical lens system is-64.6 mm.

The optical lens system has higher imaging quality by reasonably configuring the powers of the first lens element 20 to the sixth lens element 60, and combining an image processing algorithm at the rear end of the optical lens system to obtain a clear image.

The optical lens system 100 of the present application is described in further detail below in connection with specific embodiments.

First embodiment

Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of an optical lens system 100 according to a first embodiment of the present application; FIG. 2 is a graph of longitudinal spherical aberration of the optical lens system 100 of FIG. 1; FIG. 3 is a field curvature graph of the optical lens system 100 of FIG. 1; fig. 4 is a graph of F-Tan (Theta) distortion of the optical lens system 100 in fig. 1. As can be seen from fig. 1, the optical lens system 100 of the present embodiment includes, in order from an object side to an image side, a stop 80, a first lens element 20 with positive refractive power, a second lens element 30 with negative refractive power, a third lens element 40 with negative refractive power, a fourth lens element 50 with positive refractive power, a fifth lens element 60 with negative refractive power, a sixth lens element 70 with negative refractive power, an ir-cut filter 90 and an imaging plane 102.

The aperture 80 is disposed around the object side surface 22 of the first lens 20, and the aperture value of the optical lens system 100 is 1.88, wherein the aperture value of the center strong focus of the optical lens system 100 is 2.35.

The first lens element 20 is made of glass material, and has an object-side surface 22 and an image-side surface 24. The object side 22 is convex; the image side 24 is concave at the paraxial region L.

The second lens element 30 is made of plastic material, and has an object-side surface 32 and an image-side surface 34. The object side surface 32 may be concave at the paraxial region L and convex at the peripheral region; the image side 34 is concave. The diameter of the second lens 30 is smaller than that of the first lens 20, and the projection of the outer peripheral wall of the second lens 30 onto the image side surface 24 of the first lens 20 along the optical axis L is located on the concave surface of the image side surface 24.

The third lens element 40 is made of plastic material, and has an object-side surface 42 and an image-side surface 44. The object side surface 42 of the third lens element 40 is concave at the paraxial region L and flat at the circumference; image side 44 is convex; the diameter of the third lens 40 is equal to the diameter of the second lens 30.

The fourth lens element 50 is made of plastic material and has an object-side surface 52 and an image-side surface 54. The object side surface 52 is concave at the lower axis L and is a plane at the circumference; the image side surface 54 is convex at the paraxial region L and concave at the peripheral region L. The diameter of the fourth lens element 50 is larger than the diameter of the third lens element 40, and the projection of the outer peripheral wall of the third lens element 40 onto the object-side surface 54 of the fourth lens element 50 along the optical axis L is located at the concave surface of the fourth lens element 50.

The fifth lens element 60 is made of plastic material, and has an object-side surface 62 and an image-side surface 64. The object side surface 62 is convex at the paraxial region L, and is concave at the circumferential region and convex at the circumferential region; the image side surface 64 is concave at the paraxial region L and convex at the peripheral region L. The diameter of the fifth lens element 60 is larger than the diameter of the fourth lens element 50, and the projection of the outer peripheral wall of the fourth lens element 50 onto the object-side surface 62 of the fifth lens element 60 along the optical axis L is located at a concave surface of the object-side surface 62.

The sixth lens element 70 is made of plastic material and has an object-side surface 72 and an image-side surface 74. The object side surface 72 is concave at the paraxial region L, and is convex at the circumferential region and then planar; the image side surface 74 is concave at the paraxial region L and convex at the peripheral region L. The diameter of the sixth lens 70 is larger than the diameter of the fifth lens 60, and the projection of the outer peripheral wall of the fifth lens 70 onto the object-side surface 72 of the sixth lens 70 along the optical axis L is located on the convex surface of the object-side surface 72.

In the first embodiment, the design parameters of the first lens 20-sixth lens 70 of the optical lens system 100 are shown in tables 1 and 2 below.

In the first embodiment, the parameters of each aspherical surface of the optical lens system 100 are shown in table 2 below:

/>

/>

in table 1, FOV is a field angle in a diagonal direction of the optical lens system 100, and FNO is an f-number of the optical lens system.

Table 2 shows aspherical data of the first embodiment, wherein A4 to a20 are aspherical coefficients of 4 th to 20 th order of each surface.

Based on the foregoing design, the system focal length f Of the first embodiment Of the present application is 5.36mm, the system length (Total Track Length, TTL) is 5.95mm, the Field Of View (FOV) at the maximum image height is 172.0 degrees, and the aperture value (f-number) is 1.88. As can be seen from fig. 1 to fig. 4, the optical lens system 100 according to the first embodiment of the present application is beneficial to ensuring a better effect of partial light rays of the lens, and greatly reduces the system length of the optical lens system 100, so as to achieve miniaturization of the optical lens system 100, effectively correct various aberrations, and have a higher imaging quality.

Second embodiment

Referring to fig. 5 to 8, fig. 5 is a schematic structural diagram of an optical lens system 100a according to a second embodiment of the present application; FIG. 6 is a graph of longitudinal spherical aberration of the optical lens system 100a of FIG. 5; FIG. 7 is a field curvature graph of the optical lens system 100a of FIG. 5; fig. 8 is a graph of F-Tan (Theta) distortion of the optical lens system 100a in fig. 5. As can be seen from fig. 5, the optical lens system 100a of the present embodiment includes, in order from an object side to an image side, a stop 80, a first lens element 20 with negative refractive power, a second lens element 30 with negative refractive power, a third lens element 40 with negative refractive power, a fourth lens element 50 with positive refractive power, a fifth lens element 60 with negative refractive power, a sixth lens element 70 with negative refractive power, an ir-cut filter 90 and an imaging plane 102.

The diaphragm 80 is disposed around the object side surface 22 of the first lens element 20.

The first lens element 20 is made of plastic material, and has an object-side surface 22 and an image-side surface 24. The object side 22 is convex; the image side 24 is concave.

The second lens element 30 is made of plastic material, and has an object-side surface 32 and an image-side surface 34. The object side surface 32 may be concave at the paraxial region L and convex at the peripheral region; the image side 34 is concave. The diameter of the second lens 30 is smaller than the diameter of the first lens 20, and the projection of the outer peripheral wall of the second lens 30 onto the image side surface 24 of the first lens 20 along the optical axis L is located on the concave surface of the image side surface 24.

The third lens element 40 is made of plastic material, and has an object-side surface 42 and an image-side surface 44. The object side surface 42 of the third lens 40 is concave; the image side surface 44 is convex at the paraxial region L and is planar at the peripheral region L. The diameter of the third lens 40 is equal to the diameter of the second lens 30.

The fourth lens element 50 is made of plastic material and has an object-side surface 52 and an image-side surface 54. The object side surface 52 is concave; the image side surface 54 is convex at the paraxial region L and is planar at the peripheral region L. The diameter of the fourth lens 50 is larger than that of the third lens 40, and the projection of the outer peripheral wall of the third lens 40 on the object side surface 54 of the fourth lens 50 along the optical axis L is located on the concave surface of the fourth lens 50.

In the second embodiment, the design parameters of the first lens 20-sixth lens 70 of the optical lens system 100a are shown in tables 3 and 4 below.

In the second embodiment, the parameters of each aspherical surface of the optical lens system 100a are shown in table 4 below:

/>

in table 3, FOV is the angle of view in the diagonal direction of the optical lens system 100a, and FNO is the f-number of the optical lens system.

Table 4 shows aspherical data of the second example, in which A4 to a20 are aspherical coefficients of 4 th to 20 th order of each surface.

Based on the foregoing design, the system focal length f Of the second embodiment Of the present application is 5.36mm, the system length (Total Track Length, TTL) is 5.95mm, the Field Of View (FOV) at the maximum image height is 172.0 degrees, and the aperture value (f-number) is 1.88. As can be seen from fig. 6 to 8, the optical lens system 100a according to the second embodiment of the present application is beneficial to ensuring a better effect of partial light of the lens, and greatly reduces the system length of the optical lens system 100, so as to achieve miniaturization of the optical lens system 100, effectively correct various aberrations, and have a higher imaging quality.

Referring to fig. 9, fig. 9 is a schematic structural diagram of an image capturing device 300 according to an embodiment of the present application. The present application also provides an image capturing device 300 including the optical lens system 100 and the photosensitive element 310 of the present application. The photosensitive element 310 is located on the image side of the optical lens system 100.

The photosensitive element 310 in the present application may be a photosensitive coupling element (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor element (Complementary Metal-Oxide Semiconductor Sensor, CMOS sensor).

The image capturing device 300 can reduce the height of the lens, and the image quality of the image finally obtained by the image capturing device is not reduced, so that the characteristic of ultra-large wide angle is realized, and the imaging quality is improved.

For other features of the image capturing device 300, reference is made to the above description, and details thereof are not repeated herein.

Referring to fig. 10, fig. 10 is a schematic structural diagram of an electronic device 500 according to an embodiment of the present application. The application also provides an electronic device 500, which comprises a device main body 510 and the image capturing apparatus 300. The image capturing apparatus 300 is mounted on the device main body 510.

The electronic device 500 of the present application includes, but is not limited to, a cell phone, tablet computer, notebook computer, display, vehicle-mounted imaging device, camera, smart watch, smart bracelet, smart glasses, electronic book reader, portable multimedia player, ambulatory medical device, etc.

The imaging device 300 of the electronic device 500 of the present application has a small thickness, which is beneficial to reduce the volume of the electronic device 500.

While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An optical lens system, characterized in that the optical lens system has six lenses, and the optical lens sequentially comprises, from an object side to an image side:

a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power;

a third lens element with negative refractive power;

a fourth lens element with positive refractive power;

A sixth lens element with negative refractive power;

wherein the optical lens system satisfies the following conditional expression:

tan (HFOV) |/TTL >0.13; and 0.6< f1/f <1.0; -4.0< f2/f < -1; f3/f < -1;

2. The optical lens system according to claim 1, wherein an object side surface and an image side surface of any one of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are aspherical surfaces, and wherein an aspherical formula of a surface profile z of each aspherical surface lens element is as follows:

3. The optical lens system of claim 2 wherein the object side of the second lens is concave at a paraxial region; the image side surface of the second lens is a concave surface.

4. The optical lens system of claim 2, wherein the object-side surface of the third lens is concave and the image-side surface of the third lens is convex.

5. The optical lens system of claim 2, wherein the fourth lens element has a concave object-side surface and a convex image-side surface.

6. The optical lens system of claim 2, wherein the object-side surface of the fifth lens is convex at a paraxial region; the image side surface of the fifth lens is concave at a paraxial region.

7. The optical lens system of claim 2 wherein the object side of the sixth lens is concave at a paraxial region; the image side surface of the sixth lens is concave at a paraxial region.

8. The optical lens system of claim 1 further comprising an aperture, the aperture surrounding an object side of the first lens.

9. The optical lens system of claim 1, wherein the optical lens system satisfies the following conditional expression:

80°≤HFOV≤95°；

wherein the HFOV is half the horizontal field angle of the optical lens system.

10. The optical lens system of claim 1, wherein the optical lens system satisfies the following conditional expression: TTL is more than or equal to 5.7mm and less than or equal to 6.1mm;

11. The optical lens system of claim 1, wherein the optical lens system satisfies the following conditional expression: f is more than or equal to 5.2mm and less than or equal to 5.5mm;

wherein f is the focal length of the optical lens system.

12. The optical lens system of claim 1, wherein the optical lens system satisfies the following conditional expression: f1 is more than or equal to 4.0mm and less than or equal to 6.0mm;

wherein f1 is the effective focal length of the first lens.

13. The optical lens system of claim 1, wherein the optical lens system satisfies the following conditional expression:

-25.0mm≤f2≤-5.0mm；

wherein f2 is the effective focal length of the second lens.

14. The optical lens system of claim 1, wherein the optical lens system satisfies the following conditional expression:

-100.0mm≤f3≤-40.0mm；

wherein f3 is an effective focal length of the third lens.

15. An image capturing apparatus, comprising:

the optical lens system of any one of claims 1-14; a kind of electronic device with high-pressure air-conditioning system

And the photosensitive element is positioned on the image side of the optical lens system.

16. An electronic device, comprising:

an apparatus main body; a kind of electronic device with high-pressure air-conditioning system

The image capturing device of claim 15, mounted on the apparatus body.