CN112526722A

CN112526722A - Optical system, image capturing module and electronic equipment

Info

Publication number: CN112526722A
Application number: CN202011494913.5A
Authority: CN
Inventors: 乐宇明; 蔡雄宇; 兰宾利; 赵迪
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-03-19

Abstract

The invention relates to an optical system, an image capturing module and an electronic device. The optical system includes in order from an object side to an image side: the lens comprises a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a concave object-side surface; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fifth lens element with negative refractive power having a convex image-side surface; a sixth lens element with positive refractive power; and the optical system satisfies the following conditional expression: f123/f is more than or equal to-11 and less than or equal to-9; wherein f123 is a combined focal length of the first lens, the second lens and the third lens, and f is an effective focal length of the optical system. When the above relation is satisfied, it is advantageous to realize a wide angle of the optical system.

Description

Optical system, image capturing module and electronic equipment

Technical Field

The present invention relates to the field of camera shooting, and in particular, to an optical system, an image capturing module and an electronic device.

Background

At present, with the rise of the around-the-sight camera, Advanced Driving Assistance System (ADAS) and unmanned market, the vehicle-mounted lens is increasingly applied to the automobile driving assistance system. For example, in the panoramic parking assist system, a wide-angle vehicle-mounted camera is adopted to provide a driver with a 360 ° real-time aerial panoramic image of the periphery of the vehicle, and the driver can park easily by observing the real-time video image. However, as the requirements for automobile safety are continuously increased, the requirement for the wide angle of the vehicle-mounted lens is also increased, and the field angle of the current vehicle-mounted lens still needs to be improved.

Disclosure of Invention

Accordingly, there is a need for an optical system, an image capturing module and an electronic device to improve the field angle of the optical system.

An optical system comprising, in order from an object side to an image side:

a first lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a second lens element with negative refractive power having a concave object-side surface at paraxial region;

a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface;

a diaphragm;

a fourth lens element with positive refractive power having a convex object-side surface at paraxial region and a convex image-side surface at paraxial region;

a fifth lens element with negative refractive power having a convex image-side surface at a paraxial region, wherein both the object-side surface and the image-side surface of the fifth lens element are aspheric;

a sixth lens element with positive refractive power;

and the optical system satisfies the following conditional expression:

-11≤f123/f≤-9；

wherein f123 is a combined focal length of the first lens, the second lens and the third lens, and f is an effective focal length of the optical system.

When the optical system meets the above relational expression, the front lens group consisting of the first lens, the second lens and the third lens provides negative refractive power for the optical system to realize effective deflection on light rays with a large-angle view field, so that a large-angle light ray bundle can penetrate through the diaphragm, the wide angle of the optical system is realized, and meanwhile, the image surface brightness of the large-angle view field of the optical system is improved. When the refractive power of the front lens group is too strong, the large-angle marginal field of view of the optical system is prone to generate serious astigmatism, and marginal resolution capability is reduced. Below the lower limit of the above conditional expression, the refractive power of the front lens group is insufficient, which is not favorable for realizing the wide angle of the optical system.

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

f is more than or equal to 0.9mm and less than or equal to 1.0 mm. When the conditional expression is satisfied, the effective focal length of the optical system can be made small enough, so that the field angle of the optical system can be improved, and the wide angle of the optical system can be realized. Meanwhile, the field angle of the optical system is improved, so that the depth of field of the optical system is increased, the perspective of the optical system is enhanced, and the imaging quality of the optical system is improved.

40≤SDs2/|SAGs3|≤44.5；

wherein SDs2 is the maximum effective clear aperture of the object side surface of the second lens, SAGs3 is the rise of the maximum effective clear aperture of the object side surface of the second lens from the center of the object side surface of the second lens to the maximum effective clear aperture of the object side surface of the second lens in the direction parallel to the optical axis, and the distance of the maximum effective clear aperture of the object side surface of the second lens to the intersection point of the object side surface of the second lens and the optical axis in the direction parallel to the optical axis, SAGs3 is positive when the maximum effective clear aperture of the object side surface of the second lens is on the image side of the intersection point of the object side surface of the second lens and the optical axis in the direction parallel to the optical axis, and the maximum effective clear aperture of the object side surface of the second lens is on the object side of the intersection point of the object side surface of the second lens and the optical axis in the direction parallel to the optical axis, SAGs3 are negative. When the lower limit of the conditional expression is met, the object side surface of the second lens can be prevented from being excessively bent, so that the processing difficulty of the second lens is reduced, and the problem of uneven coating and further ghost image caused by the fact that the object side surface of the second lens is excessively bent is solved. Meanwhile, the object side surface of the second lens is prevented from being too curved, large-angle light rays can be incident on the optical system, and the imaging quality of the optical system is improved. When the upper limit of the conditional expression is satisfied, the object side surface of the second lens can be prevented from being too gentle, and the risk of generating ghost is reduced.

2.4≤2*f*tan(HFOV/2)≤2.511；

where f is the effective focal length of the optical system in mm and the HFOV is half the maximum field of view of the optical system in degrees. In ideal conditions, the image height of the optical system is equal to 2 f tan (HFOV/2). When the conditional expressions are satisfied, the effective focal length and the maximum field angle of the optical system can be reasonably configured, and the shooting range of the optical system is favorably expanded on the premise that the optical system has high pixels.

In one embodiment, the fourth lens is cemented with the fifth lens, and the optical system satisfies the following conditional expression:

-8≤(CT5-CT4)*(α5-α4)≤-1.25；

wherein, CT4 is the thickness of the fourth lens on the optical axis, i.e. the central thickness of the fourth lens, and is in mm, CT5 is the thickness of the fifth lens on the optical axis, and is in mm, α 4 is the thermal expansion coefficient of the fourth lens under the condition of-30 ℃ to 70 ℃, and is in 10^-6v/deg.C, α 5 is the coefficient of thermal expansion of the fifth lens at-30 deg.C-70 deg.C, in unitsIs 10^-6V. C. When the condition is satisfied, the central thicknesses of the fourth lens and the fifth lens and the materials of the fourth lens and the fifth lens can be reasonably configured, so that the influence of temperature on the optical system is reduced, and the optical system can have good imaging quality under the condition of high temperature or low temperature. Meanwhile, the central thickness difference and the material characteristic difference of the fourth lens and the fifth lens can be reduced, and the risk of cracking of a cemented lens formed by the fourth lens and the fifth lens is further reduced.

In one embodiment, the image side surface of the fifth lens is aspheric, and the optical system satisfies the following conditional expression:

31.6≤Rs10/f5≤46.5；

wherein Rs10 is a radius of curvature of an image-side surface of the fifth lens at an optical axis, and f5 is an effective focal length of the fifth lens. The image side surface of the fifth lens is an aspheric surface, so that the sensitivity of the optical system can be reduced, the aberration of the optical system can be corrected, and the imaging quality of the optical system can be improved. When the conditional expressions are satisfied, the curvature radius of the image side surface of the fifth lens can be reasonably configured, and the ghost problem is favorably improved.

13≤TTL/f≤14；

wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical system, that is, a total system length of the optical system. When the above conditional expressions are satisfied, the total optical length and the effective focal length of the optical system can be reasonably arranged, so that the total optical length of the optical system can be limited while the wide field angle range of the optical system is satisfied, and the miniaturization design of the optical system can be satisfied. Exceeding the upper limit of the above relation, the total length of the optical system is too long, which is not favorable for realizing the miniaturization design of the optical system. Below the lower limit of the above conditional expression, the effective focal length of the optical system is too long, which is not favorable for expanding the field angle of the optical system, so that the optical system cannot obtain sufficient object space information.

100deg/mm≤HFOV/f≤110deg/mm；

wherein the HFOV is half of a maximum angle of view of the optical system in a diagonal direction. When the condition formula is met, the field angle and the effective focal length of the optical system can be reasonably configured, so that the optical system has the characteristic of a large field angle, the picture viewing range of the optical system is effectively enlarged, and meanwhile, the effective focal length of the optical system is not too small, so that the optical system can clearly image a long-distance shot object while accommodating the large viewing range, the capturing capability of the optical system on low-frequency details is improved, and the shooting requirement of high image quality can be met. When the upper limit of the above relational expression is exceeded or the lower limit of the above relational expression is fallen below, it is difficult to achieve both a large viewing range and high imaging quality of the optical system, and the use demand cannot be satisfied well.

An image capturing module includes a photosensitive element and the optical system of any of the above embodiments, wherein the photosensitive element is disposed at an image side of the optical system. The image capturing module adopts the optical system, so that the wide angle of the image capturing module can be realized, and the image surface brightness of the large-angle view field of the image capturing module is improved.

An electronic device comprises a shell and the image capturing module, wherein the image capturing module is arranged on the shell. The image capturing module is adopted in the electronic equipment, so that the wide-angle range and high-image-quality shooting of the electronic equipment are facilitated.

Drawings

FIG. 1 is a schematic view of an optical system in a first embodiment of the present application;

FIG. 2 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system according to a first embodiment of the present application;

FIG. 3 is a schematic view of an optical system in a second embodiment of the present application;

FIG. 4 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system in a second embodiment of the present application;

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

FIG. 6 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system in a third embodiment of the present application;

FIG. 7 is a schematic view of an optical system according to a fourth embodiment of the present application;

FIG. 8 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system according to a fourth embodiment of the present application;

FIG. 9 is a schematic view of an optical system in a fifth embodiment of the present application;

FIG. 10 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system according to a fifth embodiment of the present application;

fig. 11 is a schematic view of an image capturing module according to an embodiment of the present application;

FIG. 12 is a diagram of an electronic device in an embodiment of the present application;

fig. 13 is a schematic view of an automobile according to an embodiment of the present application.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" 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 defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

In some embodiments of the present disclosure, referring to fig. 1, the optical system 100 includes, in order from an object side to an image side, 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. Specifically, the first lens element L1 includes an object-side surface S1 and an image-side surface S2, the second lens element L2 includes an object-side surface S3 and an image-side surface S4, the third lens element L3 includes an object-side surface S5 and an image-side surface S6, the fourth lens element L4 includes an object-side surface S7 and an image-side surface S8, the fifth lens element L5 includes an object-side surface S9 and an image-side surface S10, and the sixth lens element L6 includes an object-side surface S11 and an image-side surface S12.

The first lens element L1 with negative refractive power has a convex object-side surface S1 at a paraxial region 110 and a concave image-side surface S2 at a paraxial region 110 of the first lens element L1. The second lens element L2 with negative refractive power has a concave object-side surface S3 near the optical axis 110. The third lens element L3 with positive refractive power has a convex object-side surface S5 at a paraxial region 110 and a convex image-side surface S6 at a paraxial region 110 of the third lens element L3. The fourth lens element L4 with positive refractive power has a convex object-side surface S7 at a paraxial region 110 and a convex image-side surface S8 at a paraxial region 110 of the fourth lens element L4. The fifth lens element L5 with negative refractive power has a convex image-side surface S10 at the paraxial region 110 of the fifth lens element L5, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element L5 are aspheric. The sixth lens element L6 has positive refractive power.

In addition, in some embodiments, the optical system 100 is provided with a stop STO, which may be disposed between the third lens L3 and the fourth lens L4. In some embodiments, the optical system 100 further includes a filter L7 disposed on the image side of the sixth lens L6, and the filter L7 includes an object-side surface S13 and an image-side surface S14. Furthermore, the optical system 100 further includes an image plane S17 located on the image side of the sixth lens L6, the image plane S17 is an imaging plane of the optical system 100, and incident light is adjusted by 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 and can be imaged on the image plane S17. It should be noted that the filter L6 may be an infrared cut filter, and is used for filtering the interference light and preventing the interference light from reaching the image plane S17 of the optical system 100 to affect the normal imaging. In some embodiments, the optical system may further include a protective glass L8 disposed on the image side of the sixth lens L6, and the protective glass L8 is used for protecting the image plane S17 of the optical system 100.

In some embodiments, the object-side surface and the image-side surface of each lens of optical system 100 are both aspheric. The adoption of the aspheric surface structure can improve the flexibility of lens design, effectively correct spherical aberration and improve imaging quality. In other embodiments, the object-side surface and the image-side surface of each lens of the optical system 100 may be spherical. It should be noted that the above embodiments are only examples of some embodiments of the present application, and in some embodiments, the surface of each lens in the optical system 100 may be an aspheric surface or any combination of spherical surfaces. Further, in some embodiments, the object-side surface and the image-side surface of at least one lens in the optical system 100 are aspheric, which is beneficial to correcting the aberration of the optical system 100 and improving the imaging quality of the optical system 100.

In some embodiments, each lens in the optical system 100 may be made of glass or plastic. The use of plastic lenses can reduce the weight and cost of the optical system 100. The glass lens provides the optical system 100 with excellent optical performance and high temperature resistance. It should be noted that the material of each lens in the optical system 100 may be any combination of glass and plastic, and is not necessarily both glass and plastic.

It is to be noted that the first lens L1 does not mean that there is only one lens, and in some embodiments, there may be two or more lenses in the first lens L1, and the two or more lenses can form a cemented lens, and a surface of the cemented lens closest to the object side can be regarded as the object side surface S1, and a surface of the cemented lens closest to the image side can be regarded as the image side surface S2. Alternatively, although no cemented lens is formed between the lenses of the first lens L1, the distance between the lenses is relatively fixed, and in this case, the object-side surface of the lens closest to the object side is the object-side surface S1, and the image-side surface of the lens closest to the image side is the image-side surface S2. In addition, the number of lenses in the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, or the sixth lens L6 in some embodiments may also be greater than or equal to two, and a cemented lens may be formed between any two adjacent lenses, or may also be a non-cemented lens.

Also, in some embodiments, the optical system 100 satisfies the conditional expression: f123/f is more than or equal to-11 and less than or equal to-9; where f123 is a combined focal length of the first lens L1, the second lens L2, and the third lens L3, and f is an effective focal length of the optical system 100. Specifically, f123/f may be: -10.902, -10.852, -10.639, -10.527, -10.203, -10.025, -9.998, -9.756, -9.534, or-9.269. When the above relation is satisfied, the front lens group consisting of the first lens L1, the second lens L2, and the third lens L3 provides negative refractive power for the optical system 100, which is beneficial for the large-angle light beams to penetrate through and enter the stop STO of the optical system 100, so as to realize the wide angle of the optical system 100 and improve the image brightness of the optical system 100 in the large-angle field. Above the upper limit of the above conditional expression, the refractive power of the front lens group is too strong, which causes severe astigmatism to easily occur in the large-angle marginal field of view of the optical system 100, and reduces the marginal resolution capability. Below the lower limit of the conditional expression, the refractive power of the front lens group is insufficient, which is not favorable for realizing the wide angle of the optical system 100.

In some embodiments, the optical system 100 satisfies the conditional expression: f is more than or equal to 0.9mm and less than or equal to 1.0 mm. Specifically, f may be: 0.960, 0.961, 0.962, 0.963, 0.964, 0.965, 0.966, 0.967, 0.968 or 0.97, the units of values being mm. When the above conditional expressions are satisfied, the effective focal length of the optical system 100 can be sufficiently small, which is advantageous for increasing the field angle of the optical system 100 and realizing a wide angle of the optical system 100. Moreover, increasing the field angle of the optical system 100 is beneficial to increasing the depth of field of the optical system 100, so as to enhance the perspective of the optical system 100, and further beneficial to improving the imaging quality of the optical system 100.

In some embodiments, the optical system 100 satisfies the conditional expression: SDs2/| SAGs3| is not more than 40 and not more than 44.5; where SDs2 is the maximum effective clear aperture of the object-side surface S3 of the second lens L2, and sag 3 is the rise in the sagittal height at the maximum effective clear aperture of the object-side surface S3 of the second lens L2. Specifically, SDs2/| SAGs3| may be: 40.779, 40.956, 41.028, 41.532, 41.678, 41.992, 42.510, 43.057, 43.128, or 44.125. When the lower limit of the conditional expression is satisfied, the object side surface S3 of the second lens L2 is prevented from being excessively curved, so that the processing difficulty of the second lens L2 is reduced, and the problem of occurrence of ghost image due to uneven coating caused by the excessively curved object side surface S3 of the second lens L2 is avoided. Meanwhile, the object side surface S3 of the second lens L2 is prevented from being too curved, so that large-angle light rays can be incident on the optical system 100, and the imaging quality of the optical system 100 is improved. When the upper limit of the conditional expression is satisfied, the object-side surface S3 of the second lens L2 is prevented from being excessively flat, and the risk of occurrence of ghost images can be reduced.

In some embodiments, the optical system 100 satisfies the conditional expression: 2.4 is less than or equal to 2 f tan (HFOV/2) is less than or equal to 2.511; where f is the effective focal length of the optical system 100 in mm, and the HFOV is half the maximum field angle of the optical system 100 in degrees. Specifically, 2 f tan (HFOV/2) may be: 2.435, 2.438, 2.439, 2.50, 2.53, 2.56, 2.57, 2.58, 2.59 or 2.460. In ideal conditions, the image height of the optical system 100 is equal to 2 f tan (HFOV/2). When the above conditional expressions are satisfied, the effective focal length and the maximum angle of view of the optical system 100 can be reasonably arranged, which is beneficial to expanding the shooting range of the optical system 100 on the premise of ensuring that the optical system 100 has high pixels.

In some embodiments, the optical system 100 satisfies the conditional expression: OPT-Dist is less than or equal to 65; where OPT-Dist is the distortion of the optical system 100. Specifically, the OPT-Dist can be: 62.233, 62.308, 62.438, 62.657, 62.883, 62.901, 63.228, 63.369, 63.552, or 63.997. When the above conditional expressions are satisfied, the distortion of the optical system 100 can be controlled to avoid the situation that the distortion of the optical system 100 is too large, thereby improving the imaging quality of the optical system 100 and realizing the characteristic of high image quality.

In some embodiments, the fourth lens L4 is cemented with the fifth lens L5, and the optical system 100 satisfies the conditional expression: -8 ≤ (CT5-CT4) × (α 5- α 4) ≤ 1.25; wherein, CT4 is the thickness of the fourth lens L4 on the optical axis 110, i.e. the central thickness of the fourth lens L4, and is in mm, CT5 is the thickness of the fifth lens L5 on the optical axis 110, and is in mm, α 4 is the thermal expansion coefficient of the fourth lens L4 at-30 ℃ to 70 ℃, and is in 10^-6V.. alpha.5 is the coefficient of thermal expansion of the fifth lens L5 at-30 deg.C-70 deg.C, and has a unit of 10^-6V. C. Specifically, (CT5-CT4) (. alpha.5-a 4) may be: -7.976, -7.856, -7.023, -6.556, -6.213, -5.332, -4.397, -3.962, -1.765 or-1.298. When the above conditional expressions are satisfied, the central thicknesses of the fourth lens L4 and the fifth lens L5 and the materials of the fourth lens L4 and the fifth lens L5 can be reasonably arranged to reduce the influence of temperature on the optical system 100, so that the optical system 100 can have good imaging quality even under high-temperature or low-temperature conditions. Meanwhile, the difference of the central thickness and the difference of the material properties of the fourth lens L4 and the fifth lens L5 can be reduced, so that the risk of cracking of the cemented lens composed of the fourth lens L4 and the fifth lens L5 is reduced.

In some embodiments, the image-side surface S10 of the fifth lens L5 is aspheric, and the optical system 100 satisfies the following conditional expression: rs10/f5 is not less than 31.6 and not more than 46.5; wherein Rs10 is the curvature radius of the image-side surface S10 of the fifth lens element L5 at the optical axis 110, and f5 is the effective focal length of the fifth lens element L5. Specifically, Rs10/f5 may be: 31.680, 32.527, 33.647, 34.214, 36.852, 37.621, 38.024, 40.225, 42.367, or 46.333. The image-side surface S10 of the fifth lens element L5 is aspheric, so that the sensitivity of the optical system 100 can be reduced, which is beneficial to correcting the aberration of the optical system 100, and further the imaging quality of the optical system 100 can be improved. When the above conditional expressions are satisfied, the curvature radius of the image-side surface of the fifth lens L5 can be reasonably arranged, which is advantageous for improving the ghost problem.

In some embodiments, the optical system 100 satisfies the conditional expression: TTL/f is more than or equal to 13 and less than or equal to 14; wherein, TTL is a distance from the object-side surface S1 of the first lens element L1 to the image plane of the optical system 100 on the optical axis 110, i.e., a total system length of the optical system 100. Specifically, TTL/f may be: 13.713, 13.728, 13.736, 13.756, 13.762, 13.789, 13.805, 13.826, 13.833, or 13.885. When the above conditional expressions are satisfied, the total optical length and the effective focal length of the optical system 100 can be arranged reasonably, so that the total optical length of the optical system 100 can be restricted to satisfy the miniaturization design of the optical system 100 while satisfying the wide field angle range of the optical system 100. Exceeding the upper limit of the above relational expression makes the total length of the optical system 100 too long, which is disadvantageous for realizing a compact design of the optical system 100. Below the lower limit of the above conditional expression, the effective focal length of the optical system 100 is too long, which is not favorable for expanding the field angle of the optical system 100, and the optical system 100 cannot obtain sufficient object space information.

In some embodiments, the optical system 100 satisfies the conditional expression: HFOV/f is more than or equal to 100deg/mm and less than or equal to 110 deg/mm; the HFOV is a half of the maximum angle of view of the optical system 100 in the diagonal direction. Specifically, HFOV/f may be: 106.701, 106.855, 106.932, 107.052, 107.133, 107.264, 107.445, 107.732, 107.793 or 107.813, the numerical unit being deg/mm. When the above conditional expressions are satisfied, the angle of view and the effective focal length of the optical system 100 can be reasonably configured, so that the optical system 100 has the characteristic of a large angle of view, thereby effectively improving the picture viewing range of the optical system 100, and simultaneously, the effective focal length of the optical system 100 is not too small, so that the optical system 100 can clearly image a distant object to be photographed while accommodating the large viewing range, thereby improving the capturing capability of the optical system 100 for low-frequency details, and further meeting the shooting requirement of high image quality. If the upper limit of the above relational expression is exceeded or the lower limit of the above relational expression is fallen below, it is difficult to achieve both a large viewing range and high imaging quality of the optical system 100, and the use requirement cannot be satisfied well.

Based on the above description of the embodiments, more specific embodiments and drawings are set forth below for detailed description.

First embodiment

Referring to fig. 1 and 2, fig. 1 is a schematic diagram of the optical system 100 in the first embodiment, in which the optical system 100 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power. Fig. 2 is a graph of the spherical aberration, astigmatism and distortion of the optical system 100 in the first embodiment, which is sequentially from left to right, wherein the reference wavelength of the astigmatism graph and the distortion graph is 538nm, and the other embodiments are the same.

The object-side surface S1 of the first lens element L1 is convex at the paraxial region 110;

the image-side surface S2 of the first lens element L1 is concave at the paraxial region 110;

the object-side surface S3 of the second lens element L2 is concave at the paraxial region 110;

the image-side surface S4 of the second lens element L2 is concave at the paraxial region 110;

the object-side surface S5 of the third lens element L3 is convex at the paraxial region 110;

the image-side surface S6 of the third lens element L3 is convex at the paraxial region 110;

the object-side surface S7 of the fourth lens element L4 is convex at the paraxial region 110;

the image-side surface S8 of the fourth lens element L4 is convex at the paraxial region 110;

the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region 110;

the image-side surface S10 of the fifth lens element L5 is convex at the paraxial region 110;

the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region 110;

the image-side surface S12 of the sixth lens element L6 is convex at the paraxial region 110.

The object-side surface and the image-side surface of the first lens L1 and the third lens L3 are both spherical. The object-side and image-side surfaces of the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are aspheric.

The first lens L1 and the third lens L3 are both made of glass. The second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of plastic.

The optical system 100 satisfies the conditional expression: -10.902 f 123/f; where f123 is a combined focal length of the first lens L1, the second lens L2, and the third lens L3, and f is an effective focal length of the optical system 100. When the above relation is satisfied, the front lens group consisting of the first lens L1, the second lens L2, and the third lens L3 provides negative refractive power for the optical system 100, which is beneficial for the large-angle light beams to penetrate through and enter the stop STO of the optical system 100, so as to realize the wide angle of the optical system 100 and improve the image brightness of the optical system 100 in the large-angle field. The refractive power of the front lens group is not too strong, so that the situation that the refractive power of the front lens group is too strong to cause serious astigmatism in the wide-angle edge view field of the optical system 100 is avoided, and the edge resolving power is reduced. The refractive power of the front lens group is not insufficient, which is beneficial to realizing the wide angle of the optical system 100.

The optical system 100 satisfies the conditional expression: f is 0.97 mm. When the above conditional expressions are satisfied, the effective focal length of the optical system 100 can be sufficiently small, which is advantageous for increasing the field angle of the optical system 100 and realizing a wide angle of the optical system 100. Moreover, increasing the field angle of the optical system 100 is beneficial to increasing the depth of field of the optical system 100, so as to enhance the perspective of the optical system 100, and further beneficial to improving the imaging quality of the optical system 100.

The optical system 100 satisfies the conditional expression: SDs2/| sag 3| ═ 43.851; where SDs2 is the maximum effective clear aperture of the object-side surface S3 of the second lens L2, and sag 3 is the rise in the sagittal height at the maximum effective clear aperture of the object-side surface S3 of the second lens L2. When the conditional expressions are satisfied, the object side surface S3 of the second lens L2 can be prevented from being bent too much, so that the processing difficulty of the second lens L2 is reduced, and the problem of generation of ghost image due to uneven film coating caused by the fact that the object side surface S3 of the second lens L2 is bent too much is avoided. Meanwhile, the object side surface S3 of the second lens L2 is prevented from being too curved, so that large-angle light rays can be incident on the optical system 100, and the imaging quality of the optical system 100 is improved. In addition, the object-side surface S3 of the second lens L2 can be prevented from being too gentle, and the risk of generating ghost images can be reduced.

The optical system 100 satisfies the conditional expression: 2 f tan (HFOV/2) ═ 2.460; where f is the effective focal length of the optical system 100 in mm, and the HFOV is half the maximum field angle of the optical system 100 in degrees. In ideal conditions, the image height of the optical system 100 is equal to 2 f tan (HFOV/2). When the above conditional expressions are satisfied, the effective focal length and the maximum angle of view of the optical system 100 can be reasonably arranged, which is beneficial to expanding the shooting range of the optical system 100 on the premise of ensuring that the optical system 100 has high pixels.

The optical system 100 satisfies the conditional expression: OPT-Dist ═ 62.233; where OPT-Dist is the distortion of the optical system 100. When the above conditional expressions are satisfied, the distortion of the optical system 100 can be controlled to avoid the situation that the distortion of the optical system 100 is too large, thereby improving the imaging quality of the optical system 100 and realizing the characteristic of high image quality.

The fourth lens L4 is cemented with the fifth lens L5, and the optical system 100 satisfies the conditional expression: (CT5-CT4) (. alpha.5-a.4) — 7.427; wherein, CT4 is the thickness of the fourth lens L4 on the optical axis 110, i.e. the central thickness of the fourth lens L4, and is in mm, CT5 is the thickness of the fifth lens L5 on the optical axis 110, and is in mm, α 4 is the thermal expansion coefficient of the fourth lens L4 at-30 ℃ to 70 ℃, and is in 10^-6V.. alpha.5 is the coefficient of thermal expansion of the fifth lens L5 at-30 deg.C-70 deg.C, and has a unit of 10^-6V. C. When the above conditional expressions are satisfied, the central thicknesses of the fourth lens L4 and the fifth lens L5 and the materials of the fourth lens L4 and the fifth lens L5 can be reasonably arranged to reduce the influence of temperature on the optical system 100, so that the optical system 100 can have good imaging quality even under high-temperature or low-temperature conditions. Meanwhile, the difference of the central thickness and the difference of the material properties of the fourth lens L4 and the fifth lens L5 can be reduced, so that the risk of cracking of the cemented lens composed of the fourth lens L4 and the fifth lens L5 is reduced.

The image-side surface S10 of the fifth lens element L5 is aspheric, and the optical system 100 satisfies the following conditional expression: rs10/f5 ═ 44.902; wherein Rs10 is the curvature radius of the image-side surface S10 of the fifth lens element L5 at the optical axis 110, and f5 is the effective focal length of the fifth lens element L5. The image-side surface S10 of the fifth lens element L5 is aspheric, so that the sensitivity of the optical system 100 can be reduced, which is beneficial to correcting the aberration of the optical system 100, and further the imaging quality of the optical system 100 can be improved. When the above conditional expressions are satisfied, the curvature radius of the image-side surface of the fifth lens L5 can be reasonably arranged, which is advantageous for improving the ghost problem.

The optical system 100 satisfies the conditional expression: TTL/f is 13.713; wherein, TTL is a distance from the object-side surface S1 of the first lens element L1 to the image plane of the optical system 100 on the optical axis 110, i.e., a total system length of the optical system 100. When the above conditional expressions are satisfied, the total optical length and the effective focal length of the optical system 100 can be arranged reasonably, so that the total optical length of the optical system 100 can be restricted to satisfy the miniaturization design of the optical system 100 while satisfying the wide field angle range of the optical system 100. The effective focal length of the optical system 100 is not too long, which is beneficial to expanding the field angle of the optical system 100 and enabling the optical system 100 to obtain enough object space information.

The optical system 100 satisfies the conditional expression: HFOV/f is 106.701 deg/mm; the HFOV is a half of the maximum angle of view of the optical system 100 in the diagonal direction. When the above conditional expressions are satisfied, the angle of view and the effective focal length of the optical system 100 can be reasonably configured, so that the optical system 100 has the characteristic of a large angle of view, thereby effectively improving the picture viewing range of the optical system 100, and simultaneously, the effective focal length of the optical system 100 is not too small, so that the optical system 100 can clearly image a distant object to be photographed while accommodating the large viewing range, thereby improving the capturing capability of the optical system 100 for low-frequency details, and further meeting the shooting requirement of high image quality. If the upper limit of the above relational expression is exceeded or the lower limit of the above relational expression is fallen below, it is difficult to achieve both a large viewing range and high imaging quality of the optical system 100, and the use requirement cannot be satisfied well.

In addition, the parameters of the optical system 100 are given in table 1. Among them, the image plane S17 in table 1 may be understood as an imaging plane of the optical system 100. The elements from the object plane (not shown) to the image plane S17 are sequentially arranged in the order of the elements from top to bottom in table 1. The Y radius in table 1 is the radius of curvature of the object-side or image-side surface at the optical axis 110 for the corresponding surface number. Surface number 1 and surface number 2 are the object-side surface S1 and the image-side surface S2 of the first lens L1, respectively, that is, in the same lens, the surface with the smaller surface number is the object-side surface, and the surface with the larger surface number is the image-side surface. The first value in the "thickness" parameter column of the first lens element L1 is the thickness of the lens element along the optical axis 110, and the second value is the distance from the image-side surface of the lens element to the object-side surface of the following lens element along the image-side direction along the optical axis 110.

Note that, in this embodiment and the following embodiments, the optical system 100 may not be provided with the infrared filter L7, but the distance from the image-side surface S12 of the sixth lens L6 to the image surface S17 is kept constant at this time.

In the first embodiment, the total effective focal length f of the optical system 100 is 0.97mm, the f-number FNO is 2.05, and the maximum field angle FOV is 207 °, and in each embodiment of the present application, the field angle FOV in the diagonal direction of the optical system 100 is greater than 200 °, and the optical system has a characteristic of a large field angle.

The reference wavelength of the focal length of each lens was 538nm, and the reference wavelength of the refractive index and the abbe number of each lens was 587.56nm, which is the same for the other examples.

TABLE 1

Further, aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given by table 2. In which the surface numbers 1-12 represent image side surfaces or object side surfaces S1-S12, respectively. And K-a20 from top to bottom respectively indicate the types of aspheric coefficients, where K indicates a conic coefficient, a4 indicates a quartic aspheric coefficient, a6 indicates a sextic aspheric coefficient, A8 indicates an octal aspheric coefficient, and so on. In addition, the aspherical surface coefficient formula is as follows:

where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspheric surface to the optical axis 110, c is the curvature of the aspheric surface vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high order term in the aspheric surface profile formula.

TABLE 2

Number of noodles	3	4	7	9
					K	-9.900E+01	-8.274E-01	5.826E+00	2.444E-01
A4	-6.901E-03	-2.402E-02	-7.099E-02	-3.208E-01
					A6	4.259E-03	1.200E-01	5.994E-01	2.292E+00
A8	-1.905E-03	-2.817E-01	-3.789E+00	-1.684E+01
					A10	6.160E-04	4.031E-01	1.394E+01	7.527E+01
A12	-1.505E-04	-3.558E-01	-3.186E+01	-2.039E+02
					A14	2.634E-05	1.949E-01	4.545E+01	3.359E+02
A16	-3.021E-06	-6.471E-02	-3.935E+01	-3.291E+02
					A18	1.996E-07	1.193E-02	1.885E+01	1.762E+02
A20	-5.700E-09	-9.364E-04	-3.827E+00	-3.969E+01
					Number of noodles	10	11	12
K	-7.507E+03	-9.993E+00	1.218E+00
					A4	-6.628E-02	-6.864E-02	1.930E-02
A6	7.613E-02	-2.385E-03	-3.523E-02
					A8	-8.034E-03	1.799E-01	6.364E-02
A10	7.704E-03	-3.190E-01	-6.009E-02
					A12	-2.038E-01	2.693E-01	4.871E-02
A14	3.803E-01	-1.192E-01	-3.482E-02
					A16	-3.044E-01	2.417E-02	1.801E-02
A18	1.168E-01	-7.267E-04	-5.322E-03
					A20	-1.758E-02	-2.630E-04	6.569E-04

In addition, fig. 2 includes a Longitudinal Spherical Aberration diagram (Longitudinal Spherical Aberration) of the optical system 100, which shows the deviation of the converging focal points of the light rays of different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration diagram represents the Normalized Pupil coordinate (Normalized Pupil Coordinator) from the Pupil center to the Pupil edge, and the abscissa represents the distance (in mm) of the imaging plane from the intersection of the ray with the optical axis 110. It can be known from the longitudinal spherical aberration diagram that the convergent focus deviation degrees of the light rays with different wavelengths in the first embodiment tend to be consistent, and the diffuse speckle or the chromatic halo in the imaging picture is effectively suppressed. FIG. 2 also includes a field curvature diagram (ASTIGMATIC FIELD CURVES) of optical system 100, where the S-curve represents sagittal field curvature at 538nm and the T-curve represents meridional field curvature at 538 nm. As can be seen from the figure, the field curvature of the system is small, the field curvature and astigmatism of each field of view are well corrected, and the center and the edge of the field of view have clear imaging. Fig. 2 also includes a DISTORTION map (distorsion) of the optical system 100, and it can be seen that the image DISTORTION caused by the main beam is small and the imaging quality of the system is excellent.

Second embodiment

Referring to fig. 3 and 4, fig. 3 is a schematic diagram of the optical system 100 in the second embodiment, in which the optical system 100 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power. Fig. 4 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the second embodiment, from left to right.

In addition, the parameters of the optical system 100 are given in table 3, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.

TABLE 3

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 4, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 4

Number of noodles	3	4	7	9
					K	-9.900E+01	-8.317E-01	6.277E+00	1.805E-01
A4	-7.592E-03	-1.646E-02	-7.170E-02	-2.046E-01
					A6	5.100E-03	8.016E-02	5.540E-01	1.559E+00
A8	-2.183E-03	-1.926E-01	-3.521E+00	-1.334E+01
					A10	5.998E-04	2.887E-01	1.310E+01	6.244E+01
A12	-1.163E-04	-2.649E-01	-3.068E+01	-1.689E+02
					A14	1.649E-05	1.489E-01	4.523E+01	2.727E+02
A16	-1.648E-06	-5.022E-02	-4.090E+01	-2.595E+02
					A18	1.020E-07	9.328E-03	2.075E+01	1.345E+02
A20	-2.859E-09	-7.332E-04	-4.547E+00	-2.929E+01
					Number of noodles	10	11	12
K	-9.863E+01	-1.017E+01	1.198E+00
					A4	-7.419E-02	-7.939E-02	3.202E-02
A6	1.816E-01	1.065E-01	-9.260E-02
					A8	-5.328E-01	-2.005E-01	2.398E-01
A10	1.352E+00	3.970E-01	-3.791E-01
					A12	-2.227E+00	-5.327E-01	4.029E-01
A14	2.237E+00	4.264E-01	-2.791E-01
					A16	-1.330E+00	-1.964E-01	1.196E-01
A18	4.305E-01	4.792E-02	-2.863E-02
					A20	-5.858E-02	-4.764E-03	2.920E-03

And, according to the above provided parameter information, the following data can be derived:

f123/f	-9.269	OPT-Dist	63.906
				f	0.960	(CT5-CT4)*(α5-α4)	-7.727
SDs2/\|SAGs3\|	43.871	Rs10/f5	33.272
				2ftan(HFOV/2)	2.435	TTL/f	13.845
HFOV/f	107.813

in addition, as can be seen from the aberration diagram in fig. 4, the longitudinal spherical aberration, curvature of field, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality.

Third embodiment

Referring to fig. 5 and 6, fig. 5 is a schematic diagram of the optical system 100 in the third embodiment, in which the optical system 100 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power. Fig. 6 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the third embodiment, from left to right.

In addition, the parameters of the optical system 100 are given in table 5, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein again.

TABLE 5

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 6, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 6

f123/f	-9.363	OPT-Dist	63.997
				f	0.960	(CT5-CT4)*(α5-α4)	-1.298
SDs2/\|SAGs3\|	43.579	Rs10/f5	31.680
				2ftan(HFOV/2)	2.435	TTL/f	13.835
HFOV/f	107.813

in addition, as can be seen from the aberration diagram in fig. 6, the longitudinal spherical aberration, curvature of field, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality.

Fourth embodiment

Referring to fig. 7 and 8, fig. 7 is a schematic diagram of the optical system 100 in the fourth embodiment, in which the optical system 100 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power. Fig. 8 is a graph showing the spherical aberration, astigmatism and distortion of the optical system 100 in the fourth embodiment in order from left to right.

In addition, the parameters of the optical system 100 are given in table 7, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.

TABLE 7

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 8, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 8

f123/f	-9.895	OPT-Dist	62.298
				f	0.970	(CT5-CT4)*(α5-α4)	-1.329
SDs2/\|SAGs3\|	40.779	Rs10/f5	46.161
				2ftan(HFOV/2)	2.460	TTL/f	13.753
HFOV/f	106.701

in addition, as can be seen from the aberration diagram in fig. 8, the longitudinal spherical aberration, curvature of field, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality.

Fifth embodiment

Referring to fig. 9 and 10, fig. 9 is a schematic diagram of the optical system 100 in the fifth embodiment, in which the optical system 100 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power. Fig. 10 is a graph showing the spherical aberration, astigmatism and distortion of the optical system 100 in the fifth embodiment in order from left to right.

In addition, the parameters of the optical system 100 are given in table 9, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.

TABLE 9

Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 10, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.

Watch 10

Number of noodles	3	4	7	9
					K	-1.377E+01	-8.452E-01	6.564E+00	1.095E-01
A4	-7.841E-03	-3.344E-02	-2.945E-02	-3.344E-01
					A6	4.446E-03	1.317E-01	2.489E-02	1.610E+00
A8	-7.642E-04	-3.024E-01	-1.618E-01	-7.881E+00
					A10	-4.177E-04	5.074E-01	2.257E-01	2.349E+01
A12	2.561E-04	-4.087E-01	-2.498E-01	-4.863E+01
					A14	-6.222E-05	2.301E-01	1.172E+00	6.454E+01
A16	8.113E-06	-7.767E-02	-3.325E+00	-5.064E+01
					A18	-5.593E-07	1.444E-02	3.736E+00	2.082E+01
A20	1.606E-08	-1.136E-03	-1.485E+00	-3.322E+00
					Number of noodles	10	11	12
K	6.190E+01	-1.020E+01	1.198E+00
					A4	-5.949E-02	-5.837E-02	2.636E-02
A6	7.269E-02	-8.339E-03	-6.376E-02
					A8	1.257E-02	1.425E-01	1.697E-01
A10	-8.258E-02	-2.382E-01	-2.905E-01
					A12	1.252E-02	2.044E-01	3.401E-01
A14	1.069E-01	-1.149E-01	-2.562E-01
					A16	-9.991E-02	4.890E-02	1.172E-01
A18	3.493E-02	-1.446E-02	-2.943E-02
					A20	-4.239E-03	2.018E-03	3.110E-03

in addition, as can be seen from the aberration diagram in fig. 10, the longitudinal spherical aberration, curvature of field, and distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality.

Referring to fig. 11, in some embodiments, the optical system 100 may be assembled with the photosensitive element 210 to form the image capturing module 200. At this time, the light-sensing surface of the light-sensing element 210 may be regarded as the image surface S17 of the optical system 100. The image capturing module 200 may further include a filter L7, wherein the filter L7 is disposed between the image side surface S12 and the image surface S17 of the sixth lens element L6. The image capturing module 200 may further include a protective glass L8, wherein the protective glass L8 is located between the filter L7 and the image plane S17, and is used for protecting the photosensitive element 210. Specifically, the photosensitive element 210 may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Device. By adopting the optical system 100 in the image capturing module 200, the image capturing module 200 can be wide-angled, and the image brightness of the image capturing module 200 with a wide-angle field of view can be improved.

Referring to fig. 11 and 12, in some embodiments, the image capturing module 200 may be applied to an electronic device 300, the electronic device includes a housing 310, and the image capturing module 200 is disposed in the housing 310. Specifically, the electronic apparatus 300 may be, but is not limited to, a wearable device such as a mobile phone, a video phone, a smart phone, an electronic book reader, a vehicle-mounted image capturing apparatus such as a car recorder, or a smart watch. The image capturing module 200 is adopted in the electronic device 300, which is beneficial to the shooting of the electronic device 300 with a large angle range and high image quality.

Referring to fig. 11 and 13, in some embodiments, the electronic device 300 may be applied to an automobile 400, and the automobile 400 includes a fixing member 410, and the electronic device 300 is fixed to the fixing member 410. In this embodiment, the electronic device 300 may be a car recorder, a car-mounted camera, or the like, and the fixing member 410 may be a frame of the car 400, or may be a component connecting the electronic device 300 and the frame of the car 400. The electronic device 300 is adopted in the automobile 400, which is beneficial to the shooting of the automobile 400 in a large angle range and high image quality, and is further beneficial to improving the driving safety.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An optical system comprising, in order from an object side to an image side:

a diaphragm;

a sixth lens element with positive refractive power;

and the optical system satisfies the following conditional expression:

-11≤f123/f≤-9；

2. The optical system according to claim 1, wherein the following conditional expression is satisfied:

0.9mm≤f≤1.0mm。

3. the optical system according to claim 1, wherein the following conditional expression is satisfied:

40≤SDs2/|SAGs3|≤44.5；

wherein SDs2 is the maximum effective clear aperture of the object side of the second lens, SAGs3 is the rise at the maximum effective clear aperture of the object side of the second lens.

4. The optical system according to claim 1, wherein the following conditional expression is satisfied:

2.4≤2*f*tan(HFOV/2)≤2.511mm；

wherein the HFOV is half of a maximum field angle of the optical system in degrees.

5. The optical system according to claim 1, wherein the fourth lens is cemented with the fifth lens, and the optical system satisfies the following conditional expression:

-8mm*10^-6/℃≤(CT5-CT4)*(α5-α4)≤-1.25mm*10^-6/℃；

wherein, CT4 is the thickness of the fourth lens on the optical axis, and the unit is mm, CT5 is the thickness of the fifth lens on the optical axis, and the unit is mm, and alpha 4 is the thermal expansion coefficient of the fourth lens under the condition of-30 ℃ to 70 ℃, and the unit is 10^-6V DEG C, alpha 5 is the temperature of the fifth lens at-30-70 DEG CCoefficient of thermal expansion in 10^-6/℃。

6. The optical system according to claim 1, wherein an image-side surface of the fifth lens element is aspheric, and the optical system satisfies the following conditional expression:

31.6≤Rs10/f5≤46.5；

wherein Rs10 is a radius of curvature of an image-side surface of the fifth lens at an optical axis, and f5 is an effective focal length of the fifth lens.

7. The optical system according to claim 1, wherein the following conditional expression is satisfied:

13≤TTL/f≤14；

wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical system.

8. The optical system according to claim 1, wherein the following conditional expression is satisfied:

100deg/mm≤HFOV/f≤110deg/mm；

wherein the HFOV is half of a maximum angle of view of the optical system in a diagonal direction.

9. An image capturing module, comprising a photosensitive element and the optical system of any one of claims 1 to 8, wherein the photosensitive element is disposed on an image side of the optical system.

10. An electronic device, comprising a housing and the image capturing module of claim 9, wherein the image capturing module is disposed on the housing.