CN212540868U

CN212540868U - Optical lens, image capturing module and electronic device

Info

Publication number: CN212540868U
Application number: CN202022127538.2U
Authority: CN
Inventors: 华露; 杨健; 李明
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-02-12
Anticipated expiration: 2030-09-24

Abstract

The application discloses an optical lens, an image capturing module and an electronic device. The optical lens sequentially comprises from the object side to the image side along the optical axis: a prism having a reflective surface; a first lens element with positive refractive power; a second lens element with negative refractive power; a third lens element with refractive power; a fourth lens element with refractive power; wherein the optical lens satisfies the following conditional expression: -4.5< f12/f234< -2; f12 is a combined effective focal length of the first lens and the second lens, and f234 is a combined effective focal length of the second lens, the third lens, and the fourth lens. The axial length of the optical lens is shortened by effectively utilizing the space, the long-focus characteristic is realized, and the occupied space of the optical lens is saved.

Description

Optical lens, image capturing module and electronic device

Technical Field

The application relates to the technical field of optical imaging, in particular to an optical lens, an image capturing module and an electronic device.

Background

With the popularization of portable electronic devices (such as smart phones and cameras), and with the popularity of social, video and live broadcast software, people have a higher and higher preference for photography, the camera lens becomes a standard of the portable electronic devices, and the performance of the camera lens even becomes an index of primary consideration when consumers purchase the portable electronic devices.

In the process of implementing the present application, the applicant finds that at least the following problems exist in the prior art: in order to obtain the long focus characteristic of the camera lens, the total length of the camera lens needs to be increased, so that the transverse distance of the camera lens is increased, and the requirement of lightening and thinning of electronic equipment is not met.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an optical lens, an image capturing module and an electronic device to solve the above problems.

An embodiment of the present disclosure provides an optical lens assembly, sequentially from an object side to an image side along an optical axis, including:

the image side of the object side comprises:

a prism having a reflective surface;

a first lens element with positive refractive power;

a second lens element with negative refractive power;

a third lens element with refractive power;

a fourth lens element with refractive power;

wherein the optical lens satisfies the following conditional expression:

-4.5<f12/f234<-2；

f12 is a combined effective focal length of the first lens and the second lens, and f234 is a combined effective focal length of the second lens, the third lens, and the fourth lens.

So, the ratio of the effective focal length of the combination of the first lens and the second lens and the effective focal length of the combination of the first lens and the second lens, the third lens and the fourth lens is reasonably configured, which is helpful to avoid the first two lenses from generating larger spherical aberration, and the effective focal length of each lens group is reasonably set, so that the total length of the optical lens is shortened, the long-focus characteristic can be realized, the aberration correction capability is improved, and the optical lens obtains better imaging quality. The right-angle prism deflects light rays, so that the optical lens is of a periscopic structure, the space is effectively utilized, the axial length of the optical lens is shortened, the long-focus characteristic is realized, and the occupied space of the optical lens is saved.

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

3.3°/mm<CRA1/(2*SD42)<6.3°/mm；

CRA1 is a chief ray incident angle of 1.0 field of view on an imaging surface of the optical lens, and SD42 is a maximum effective half aperture of an image side surface of the fourth lens.

When the relation is met, the ratio of the chief ray incident angle of the 1.0 view field on the imaging surface of the optical lens to the maximum effective half aperture of the image side surface of the fourth lens L4 is reasonably set, so that the optical lens can be better matched with a chip, and the reasonable configuration of the maximum effective half aperture of the image side surface of the fourth lens is beneficial to the transition of marginal view field light to the image surface with larger illuminance, thereby improving the imaging quality of the optical lens.

0.5<ET3/(|SAG31|+|SAG32|)<6；

wherein ET3 is a side thickness value of the third lens, SAG31 is an on-axis distance from an intersection of an object-side surface and an optical axis of the third lens to a maximum effective radius of the object-side surface of the third lens, and SAG32 is an on-axis distance from an intersection of an image-side surface and an optical axis of the third lens to a maximum effective radius of the image-side surface of the third lens.

When the relation is satisfied, the ratio of the sum of the rise absolute values of the object side surface and the image side surface of the third lens and the third lens is reasonably controlled, so that the total length of the system is favorably shortened, the processability of the third lens is improved, and the molding sensitivity is reduced.

SDmax/SDmin<1.45；

wherein SDmax is a maximum value of maximum effective half-apertures of respective object-side surfaces or image-side surfaces of the first lens element, the second lens element, the third lens element, and the fourth lens element, and SDmin is a minimum value of maximum effective half-apertures of respective object-side surfaces or image-side surfaces of the first lens element, the second lens element, the third lens element, and the fourth lens element.

When the relation is met, the ratio of the maximum value to the minimum value of the maximum effective semi-calibers of the first lens, the second lens, the third lens and the fourth lens is reasonably configured, and the calibers of the first lens, the second lens, the third lens and the fourth lens of the optical lens are prevented from being greatly different, so that the forming sensitivity of the optical lens is increased, and the stability is reduced.

0.5<R22/(CT2+AT23)<3.5；

wherein R22 is a curvature radius of an image-side surface of the second lens element on an optical axis, CT2 is a thickness of the second lens element on the optical axis, and AT23 is an air space between the second lens element and the third lens element on the optical axis.

When the relation is satisfied, the ratio relation between the curvature radius of the image side surface of the second lens and the sum of the thickness of the second lens and the distance from the second lens to the next lens is reasonably configured, and the total length of the optical lens is favorably shortened.

0.5mm^-1<f1/(R11*CT1)<2.5mm^-1；

wherein f1 is an effective focal length of the first lens, R11 is a curvature radius of an object side surface of the first lens, and CT1 is a thickness of the first lens on an optical axis.

When the relation is met, the relation between the effective focal length of the first lens and the curvature radius and the thickness of the object side surface of the first lens is reasonably set, so that the pressure of the rear lens group for balancing spherical aberration is reduced, and the resolving power is improved; in addition, the reasonable arrangement of the curvature radius and the thickness is also beneficial to reducing the molding sensitivity of the optical lens, reducing the molding difficulty and reducing the processing cost.

1mm^-1<FNO/SD11<3mm^-1；

wherein FNO is an f-number of the optical lens, and SD11 is a maximum effective half aperture of an object-side surface of the first lens.

When the relation is satisfied, the ratio of the optical lens f-number to the maximum effective half aperture of the first lens object side surface is reasonably configured, so that the sufficient light transmission amount can be obtained under the environment with dark light, the size of the Airy spots is reduced, and the shooting effect under the environment with dark light such as cloudy and rainy days is improved. In addition, the value of the maximum effective half aperture of the object side surface of the first lens is reasonably set, so that sufficient light rays can smoothly enter the optical lens to reach an imaging surface, and dark corners of four corners of the electronic photosensitive element can be avoided.

0.65<SD42/ImgH<0.95；

the SD42 is the maximum effective half aperture of the image-side surface of the fourth lens element, and the ImgH is half of the diagonal length of the effective photosensitive area of the imaging surface.

When the relation is met, the ratio relation between the maximum effective half aperture and the half image height of the image side surface of the fourth lens is reasonably configured, so that the chief ray angle of the marginal field of view is favorably controlled within a reasonable range, and the chief ray angle of the inner field of view can be better matched with the chip; in addition, the optical lens is beneficial to reducing the whole size of the optical lens, saving materials in the manufacturing process and saving space for equipment carrying the optical lens.

The embodiment of the present application further provides an image capturing module, including:

the optical lens; and

a light sensing element disposed on an image side of the optical lens.

The optical lens of the image capturing module in the embodiment of the application is reasonable in design of effective focal length of the four lenses, and helps to avoid the fact that the front two lenses generate large spherical aberration, the effective focal length of each lens group is reasonably set, so that the total length of the optical lens can be shortened, the long-focus characteristic can be realized, the aberration correction capability is improved, and the optical lens obtains better imaging quality.

An embodiment of the present application further provides an electronic device, including:

a housing; and

the image capturing module is mounted on the shell.

The optical lens in the electronic device provided by the embodiment of the application is beneficial to avoiding the generation of large spherical aberration of the first two lenses through reasonably configuring the ratio of the combined effective focal length of the first lens and the second lens to the combined effective focal length of the first lens and the second lens and the ratio of the combined effective focal length of the third lens and the fourth lens, and the effective focal length of each lens group is reasonably set, so that the total length of the optical lens can be shortened, the long-focus characteristic can be realized, the aberration correction capability is improved, and the optical lens can obtain better imaging quality. The right-angle prism deflects light rays, so that the optical lens is of a periscopic structure, the space is effectively utilized, the transverse thickness of the optical lens is shortened, the long-focus characteristic is realized, and the occupied space of the optical lens is saved.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The above technical content and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present application.

Fig. 2 is a schematic diagram of spherical aberration, astigmatism and distortion according to a first embodiment of the present application.

Fig. 3 is a schematic structural diagram of an optical lens according to a second embodiment of the present application.

Fig. 4 is a schematic diagram of spherical aberration, astigmatism and distortion according to a second embodiment of the present application.

Fig. 5 is a schematic structural diagram of an optical lens according to a third embodiment of the present application.

Fig. 6 is a schematic diagram of spherical aberration, astigmatism and distortion according to a third embodiment of the present application.

Fig. 7 is a schematic structural diagram of an optical lens according to a fourth embodiment of the present application.

Fig. 8 is a schematic diagram of spherical aberration, astigmatism and distortion according to a fourth embodiment of the present application.

Fig. 9 is a schematic structural diagram of an optical lens according to a fifth embodiment of the present application.

Fig. 10 is a schematic diagram of spherical aberration, astigmatism and distortion of a fifth embodiment of the present application.

Fig. 11 is a schematic structural diagram of an optical lens according to a sixth embodiment of the present application.

Fig. 12 is a schematic view of spherical aberration, astigmatism and distortion of a sixth embodiment of the present application.

Fig. 13 is a schematic structural diagram of an optical lens according to a seventh embodiment of the present application.

Fig. 14 is a schematic view of spherical aberration, astigmatism and distortion of a seventh embodiment of the present application.

Fig. 15 is a schematic structural diagram of an image capturing module according to an embodiment of the present application.

Fig. 16 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Description of the main elements

Electronic device 1000

Image capturing module 100

Optical lens 10

First lens L1

Second lens L2

Third lens L3

Fourth lens L4

Right-angle prism L5

Optical filter L6

Stop STO

Object sides S1, S3, S5, S7 and S12

Like sides S2, S4, S6, S8, S13

Incident surface S9

Reflecting surface S10

Emission surface S11

Image forming surface S14

Photosensitive element 20

Housing 200

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

Referring to fig. 1, the optical lens 10 of the present embodiment includes, in order from an object side to an image side along an optical axis, a prism L5, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with refractive power, and a fourth lens element L4 with refractive power.

The first lens L1 has an object-side surface S1 and an image-side surface S2, the second lens L2 has an object-side surface S3 and an image-side surface S4, the third lens L3 has an object-side surface S5 and an image-side surface S6, the fourth lens L4 has an object-side surface S7 and an image-side surface S8, and the rectangular prism L5 has an incident surface S9, a reflecting surface S10, and an exit surface S11. The object-side surface and the image-side surface of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are aspheric.

The optical lens satisfies the following conditional expression:

-4.5<f12/f234<-2；

where f12 is the combined effective focal length of the first lens L1 and the second lens L2, and f234 is the combined effective focal length of the second lens L2, the third lens L3 and the fourth lens L4.

When the above relational expression is satisfied, the ratio of the combined effective focal length of the first lens L1 and the second lens L2 to the combined effective focal length of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 is reasonably configured, which helps to avoid the first two lenses from generating large spherical aberration, and the effective focal lengths of the lens groups are reasonably set, so that the total length of the optical lens 10 is shortened, the telephoto characteristic can be realized, the aberration correction capability is improved, and the optical lens 10 obtains better imaging quality.

The light is deflected by the prism L5, so that the optical lens 10 is in a periscopic structure, thereby effectively utilizing the space, shortening the transverse thickness of the optical lens 10, realizing the long-focus characteristic and saving the occupied space of the optical lens 10.

It is understood that the prism L5 can be a right-angle prism, a regular prism, or other types of prisms, as long as the deflection of the light can be achieved.

3.3°/mm<CRA1/(2*SD42)<6.3°/mm；

CRA1 is a chief ray incident angle of 1.0 view field on the imaging surface of the optical lens 10, and SD42 is the maximum effective half-aperture of the image-side surface S8 of the fourth lens L4.

When the above relationship is satisfied, a ratio of a chief ray incident angle of a 1.0 field of view on an imaging surface of the optical lens 10 to a maximum effective half aperture of the image side surface S8 of the fourth lens L4 is reasonably set, which is beneficial for the optical lens 10 to better match a chip, and the reasonable configuration of the maximum effective half aperture of the image side surface S8 of the fourth lens L4 helps marginal field of view light to transit to the image surface with a larger illuminance, thereby providing an effective help for the improvement of imaging quality. When CRA1/(2 × SD42) > (6.3 °/mm), the chief ray incident angle of 1.0 field on the imaging plane is too large, which easily causes a dark angle, and the imaging effect of each field is not uniform; when CRA1/(2 × SD42) < ═ 3.3 °/mm, the chief ray incident angle of 1.0 field of view on the imaging surface is too small to easily match with the chip of high pixel, so that the shooting effect of high pixel cannot be achieved.

0.5<ET3/(|SAG31|+|SAG32|)<6；

ET3 is the edge thickness of the third lens L3, SAG31 is the on-axis distance from the intersection point of the object-side surface S5 of the third lens L3 and the optical axis to the maximum effective radius of the object-side surface S5 of the third lens L3, and SAG32 is the on-axis distance from the intersection point of the image-side surface S6 of the third lens L3 and the optical axis to the maximum effective radius of the image-side surface S6 of the third lens L3.

Thus, when the above relationship is satisfied, the ratio of the sum of the rise absolute values of the object-side surface S5 and the image-side surface S6 of the third lens L3 and the third lens L3 is reasonably controlled, which is advantageous in reducing the total length of the system, improving the workability of the third lens L3, and reducing the molding sensitivity. When ET3/(| SAG31| + | SAG32|) < ═ 0.5, the edge thickness of the third lens L3 is too small, and the rise of the object-side and image-side of the third lens L3 is too large, so that the difference between the thicknesses of the center and the edge of the lens is too large, the lens is easy to wear in the lens forming and assembling process, and the manufacturing cost is increased; ET3/(| SAG31| + | SAG32|) >, the third lens L3 side is too thick, which increases the material input cost and easily increases the weight of the final lens, which is not favorable for realizing the light and thin design of the lens.

In some embodiments, the optical lens 10 satisfies the following conditional expression:

SDmax/SDmin<1.45；

When the above relationship is satisfied, the ratio of the maximum value to the minimum value of the maximum effective half apertures of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 is configured reasonably, and the aperture difference of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 of the optical lens 10 is avoided to be too large, so that the molding sensitivity of the optical lens 10 is increased, and the stability is reduced. When SDmax/SDmin > is 1.45, the difference between the maximum value and the minimum value of the maximum effective half-apertures of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 is too large, the uniformity of the maximum effective half-apertures of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 of the optical lens 10 is reduced, the size drop is too large, the light deflection angle is too large, and the molding difficulty and the processing cost are increased.

0.5<R22/(CT2+AT23)<3.5；

wherein R22 is a curvature radius of the image-side surface S4 of the second lens element L2 along the optical axis, CT2 is a thickness of the second lens element L2 along the optical axis, and AT23 is an air space between the second lens element L2 and the third lens element L3 along the optical axis.

When the above relationship is satisfied, it is advantageous to shorten the total length of the optical lens 10 to appropriately configure the ratio of the radius of curvature of the image-side surface S4 of the second lens L2 at the optical axis to the sum of the thickness of the second lens L2 and the air space to the next lens at the optical axis. When R22 ═ 2.4, the image side surface S4 of the second lens L2 is curved too much, which increases the difficulty of molding and assembling; when R22> is 4, the image side surface S4 of the second lens L2 has a gentle surface profile, which is not favorable for correcting aberrations such as spherical aberration generated by the front and rear lenses. In addition, the reasonable arrangement of the distance between the image side surface S4 of the second lens L2 and the upper surface and the rear surface is also beneficial to lens assembly and reduction of molding difficulty.

0.5mm^-1<f1/(R11*CT1)<2.5mm^-1；

where f1 is the effective focal length of the first lens L1, R11 is the radius of curvature of the object-side surface S1 of the first lens L1, and CT1 is the thickness of the first lens L1 on the optical axis.

When the relation is met, the relation between the effective focal length of the first lens L1 and the curvature radius and the thickness of the object side surface S1 of the first lens L1 is reasonably set, so that the pressure of the balance spherical aberration of the rear lens group is reduced, and the resolving power is improved; in addition, the reasonable setting of curvature radius and thickness also helps to reduce the sensitivity, reduces the shaping difficulty, reduces processing cost. When f1/(R11 × CT)1)<＝0.5mm^-1In the meantime, the curvature radius of the object-side surface S1 of the first lens L1 is too large, which is not favorable for aberration correction, and the thickness is too large, which is not favorable for saving material and increasing cost; when f 1/(R11X CT1)>＝2.5mm^-1In this case, the positive refractive power provided by the first lens element L1 is too large, which is not favorable for the balanced distribution of the refractive powers of the optical lens system 10, and thus causes unwanted aberrations and degrades the image quality.

1mm^-1<FNO/SD11<3mm^-1；

wherein FNO is an f-number of the optical lens, and SD11 is a maximum effective half-aperture of the object-side surface S1 of the first lens L1.

When the relation is met, the ratio of the optical lens f-number to the maximum effective half aperture of the object side surface S1 of the first lens L1 is reasonably configured, so that the sufficient light flux can be obtained under the environment with dark light, the size of Airy spots is reduced, and the shooting effect under the environment with dark light such as cloudy and rainy days is improved. In addition, the value of the maximum effective half aperture of the object-side surface S1 of the first lens L1 is reasonably set, which is helpful for sufficient light to smoothly enter the optical lens 10 and reach an imaging surface, thereby avoiding dark corners at four corners of the electronic photosensitive element.

0.65<SD42/ImgH<0.95；

SD42 is the maximum effective half aperture of the image-side surface S8 of the fourth lens L4, and ImgH is half the diagonal length of the effective photosensitive area of the image plane, i.e., half the image height.

When the relation is met, the ratio relation between the maximum effective half aperture and the half image height of the image side surface S8 of the fourth lens L4 is reasonably configured, so that the chief ray angle of the marginal field of view is favorably controlled within a reasonable range, and the chief ray angle of the inner field of view can be better matched with a chip; in addition, the overall size of the optical lens is reduced, materials are saved during manufacturing, and space is saved for equipment carrying the lens. When SD42/ImgH is 0.65, the maximum effective half aperture of the image side surface S8 of the fourth lens L4 is too small relative to the image plane size, which is not favorable for reducing the optical total length, and is easy to cause the marginal field light deflection angle to be too large; when SD42/ImgH > is 0.95, the maximum effective half aperture of the image side surface S8 of the fourth lens L4 is too large, which may cause the thickness of the middle thick side of the fourth lens L4 and the distribution of the lens radii to be unreasonable, thereby increasing the difficulty of processing and making the manufacturing and molding difficult.

In some embodiments, the optical lens 10 further includes a stop STO. The stop STO is disposed before the first lens L1. The stop STO is used to reduce stray light, which is helpful to improve image quality.

In some embodiments, the optical lens 10 further includes a filter L6, the filter L6 having an object side S12 and an image side S13. The filter L6 is disposed on the image-side surface S8 of the fourth lens element L4 to filter out light in other wavelength bands, such as visible light, and only let infrared light pass through, so that the optical lens system 10 can also form images in dark environments and other special application scenes.

When the optical lens 10 is used for imaging, light rays emitted or reflected by a subject enter the optical lens 10 from the object side direction, are deflected by the prism L5 and pass through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the filter L6 in sequence, and finally converge on the image plane S14.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are all made of plastic. In this case, the plastic lens can reduce the weight of the optical lens 10 and the production cost. In other embodiments, each lens may be made of glass, or any combination of plastic and glass.

First embodiment

With reference to fig. 1, the optical lens system 10 in the present embodiment includes, from an object side to an image side along an optical axis, a prism L5, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, and an ir filter L6, wherein a stop STO is disposed between the prism L5 and the first lens element L1.

In this embodiment, the prism L5 may be a right-angle prism for deflecting the incident light rays by 90 degrees.

In the present embodiment, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 is concave at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is concave at the paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S8 is convex at the paraxial region.

The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is convex at the circumference; the object-side surface S3 of the second lens element L2 is concave at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is convex at the circumference, and the image-side surface S6 is concave at the circumference; the object-side surface S7 of the fourth lens element L4 is convex at the circumference, and the image-side surface S8 is convex at the circumference.

Referring to fig. 2, fig. 2 shows a light spherical aberration curve of the optical lens 10 at 435nm, 470nm, 510nm, 555nm, 610nm, 650nm, a light astigmatism curve at 555nm, and a distortion curve at 555nm in the first embodiment, wherein the reference wavelength of the focal length of fig. 2 is 555nm, and the optical lens 10 in the first embodiment satisfies the conditions of the following table.

Table 1

The reference wavelength of the refractive index and abbe number in table 1 is 586.7 nm. Wherein EF is an effective focal length of the optical lens, FNO is an f-number of the optical lens 10, FOV is an angle of view of the optical lens 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the image surface S15 on the optical axis.

Table 2

The first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are all aspherical mirrors. The aspherical surface has a surface shape determined by the following formula:

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 2 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for each of the

spherical mirror surfaces

9, 10 in the first embodiment.

Second embodiment

Referring to fig. 3, the optical lens system 10 in the present embodiment includes, from an object side to an image side along an optical axis, a prism L5, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, and an ir filter L6, wherein a stop STO is located between the prism L5 and the first lens element L1.

In the present embodiment, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is convex at the paraxial region; the object-side surface S3 of the second lens element L2 is concave at the paraxial region thereof, and the image-side surface S4 is concave at the paraxial region thereof; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is concave at the paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S8 is convex at the paraxial region.

The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is convex at the circumference; the object-side surface S3 of the second lens element L2 is concave at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is concave at the circumference.

Referring to fig. 4, fig. 4 shows a light spherical aberration curve of the optical lens 10 at 435nm, 470nm, 510nm, 555nm, 610nm, 650nm, a light astigmatism curve at 555nm, and a distortion curve at 555nm in the second embodiment, wherein the reference wavelength of the focal length of fig. 4 is 555nm, and the optical lens 10 in the second embodiment satisfies the conditions of the following table.

Table 3

In table 3, the reference wavelength of the refractive index and abbe number is 586.7 nm. Wherein EF is an effective focal length of the optical lens, FNO is an f-number of the optical lens 10, FOV is an angle of view of the optical lens 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the image surface S15 on the optical axis.

Table 4

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 5 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for each of the

spherical mirror surfaces

9, 10 in example two.

Third embodiment

Referring to fig. 5, the optical lens system 10 in the present embodiment includes, from an object side to an image side along an optical axis, a prism L5, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, and an ir filter L6, wherein a stop STO is located between the prism L5 and the first lens element L1.

The object-side surface S1 of the first lens element L1 is concave at the circumference, and the image-side surface S2 is convex at the circumference; the object-side surface S3 of the second lens element L2 is concave at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is convex at the circumference, and the image-side surface S8 is concave at the circumference.

Referring to fig. 6, fig. 6 shows a light spherical aberration curve of the optical lens 10 at 435nm, 470nm, 510nm, 555nm, 610nm, 650nm, a light astigmatism curve at 555nm, and a distortion curve at 555nm in the third embodiment, wherein the reference wavelength of the focal length of fig. 6 is 555nm, and the optical lens 10 in the third embodiment satisfies the conditions of the following table.

Table 5

In table 5, the reference wavelength of the refractive index and abbe number is 586.7 nm. Wherein EF is an effective focal length of the optical lens, FNO is an f-number of the optical lens 10, FOV is an angle of view of the optical lens 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the image surface S15 on the optical axis.

Table 6

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 8 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for each of the

spherical mirror surfaces

9, 10 in example three.

Fourth embodiment

Referring to fig. 7, the optical lens system 10 of the present embodiment includes, from an object side to an image side along an optical axis, a prism L5, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, and an ir filter L6, wherein a stop STO is disposed between the prism L5 and the first lens element L1.

In the present embodiment, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 is concave at the paraxial region; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is concave at the paraxial region; the object-side surface S7 of the fourth lens element L4 is convex at the paraxial region, and the image-side surface S8 is concave at the paraxial region.

The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is convex at the circumference; the object-side surface S3 of the second lens element L2 is concave at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is convex at the circumference, and the image-side surface S8 is concave at the circumference.

Referring to fig. 8, fig. 8 shows a light spherical aberration curve of the optical lens 10 at 435nm, 470nm, 510nm, 555nm, 610nm, 650nm, a light astigmatism curve at 555nm, and a distortion curve at 555nm in the fourth embodiment, wherein the reference wavelength of the focal length of fig. 8 is 555nm, and the optical lens 10 in the fourth embodiment satisfies the conditions of the following table.

Table 7

In table 7, the reference wavelength of the refractive index and abbe number is 586.7 nm. Wherein EF is an effective focal length of the optical lens, FNO is an f-number of the optical lens 10, FOV is an angle of view of the optical lens 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the image surface S15 on the optical axis.

Table 8

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 11 gives the high-order term coefficients K, A4, a6, a8, a10 … … which can be used for each of the

spherical mirror surfaces

9, 10 in the fourth embodiment.

Fifth embodiment

Referring to fig. 9, the optical lens system 10 of the present embodiment includes, from an object side to an image side along an optical axis, a prism L5, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, and an ir filter L6, wherein a stop STO is disposed between the prism L5 and the first lens element L1.

In the present embodiment, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is convex at the paraxial region; the object-side surface S3 of the second lens element L2 is concave at the paraxial region thereof, and the image-side surface S4 is concave at the paraxial region thereof; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is convex at the paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at paraxial region, and the image-side surface S8 is convex at optical axis region.

The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is convex at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is convex at the circumference.

Referring to fig. 10, fig. 10 shows a light spherical aberration curve of the optical lens 10 at 435nm, 470nm, 510nm, 555nm, 610nm, 650nm, a light astigmatism curve at 555nm, and a distortion curve at 555nm in the fifth embodiment, wherein the reference wavelength of the focal length of fig. 10 is 555nm, and the optical lens 10 in the fifth embodiment satisfies the conditions of the following table.

Table 9

In table 9, the reference wavelength of the refractive index and abbe number is 586.7 nm. Wherein EF is an effective focal length of the optical lens, FNO is an f-number of the optical lens 10, FOV is an angle of view of the optical lens 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the image surface S15 on the optical axis.

Table 10

The first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are all aspheric lenses. The aspherical surface has a surface shape determined by the following formula:

where Z is the longitudinal distance from any point on the aspherical surface to the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (reciprocal of the radius of curvature), k is a conic constant, and Ai is a correction coefficient of the i-th order of the aspherical surface, and table 14 gives the high-order term coefficients K, A4, a6, a8, a10 … … that can be used for the

spherical mirror surfaces

9, 10 in the fifth embodiment.

Sixth embodiment

Referring to fig. 11, the optical lens system 10 in the present embodiment includes, from an object side to an image side along an optical axis, a prism L5, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, and an ir filter L6, wherein a stop STO is located between the prism L5 and the first lens element L1.

In the present embodiment, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is concave at the paraxial region; the object-side surface S3 of the second lens element L2 is convex at the paraxial region, and the image-side surface S4 is concave at the paraxial region; the object-side surface S5 of the third lens element L3 is concave at the paraxial region thereof, and the image-side surface S6 is convex at the paraxial region thereof; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S8 is concave at the paraxial region.

The object-side surface S1 of the first lens element L1 is concave at the circumference, and the image-side surface S2 is convex at the circumference; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is convex at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is convex at the circumference.

Referring to fig. 12, fig. 12 shows a light spherical aberration curve of the optical lens 10 at 435nm, 470nm, 510nm, 555nm, 610nm, 650nm, a light astigmatism curve at 555nm, and a distortion curve at 555nm in the sixth embodiment, wherein the reference wavelength of the focal length of fig. 12 is 555nm, and the optical lens 10 in the sixth embodiment satisfies the conditions of the following table.

Table 11

In table 11, the reference wavelength of the refractive index and abbe number is 586.7 nm. Wherein EF is an effective focal length of the optical lens, FNO is an f-number of the optical lens 10, FOV is an angle of view of the optical lens 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the image surface S15 on the optical axis.

Table 12

spherical mirror surfaces

9, 10 in the fifth embodiment.

Seventh embodiment

Referring to fig. 13, the optical lens system 10 of the present embodiment includes, from an object side to an image side along an optical axis, a prism L5, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, and an ir filter L6, wherein a stop STO is disposed between the prism L5 and the first lens element L1.

In the present embodiment, the object-side surface S1 of the first lens element L1 is convex at the paraxial region, and the image-side surface S2 is convex at the paraxial region; the object-side surface S3 of the second lens element L2 is concave at the paraxial region thereof, and the image-side surface S4 is concave at the paraxial region thereof; the object-side surface S5 of the third lens element L3 is convex at the paraxial region, and the image-side surface S6 is convex at the paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S8 is convex at the paraxial region.

The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is convex at the circumference; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is convex at the circumference, and the image-side surface S6 is concave at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is convex at the circumference.

Referring to fig. 14, fig. 14 shows a light spherical aberration curve diagram of the optical lens 10 at 435nm, 470nm, 510nm, 555nm, 610nm, 650nm, a light astigmatism curve at 555nm, and a distortion curve diagram at 555nm in the seventh embodiment, wherein the reference wavelength of the focal length of fig. 14 is 555nm, and the optical lens 10 in the seventh embodiment satisfies the conditions of the following table.

Table 13

In table 13, the reference wavelength of the refractive index and abbe number is 586.7 nm. Wherein EF is an effective focal length of the optical lens, FNO is an f-number of the optical lens 10, FOV is an angle of view of the optical lens 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the image surface S15 on the optical axis.

Table 14

spherical mirror surfaces

9, 10 in the fifth embodiment.

Table 15 shows values of f12/f234, CRA1/(2 × SD42), ET3/(| SAG31| + | SAG32|), SDmax/SDmin, R22/(CT2+ AT23), f1/(R11 × CT1), FNO/SD11, and SD42/ImgH in the optical lenses of the first to seventh embodiments.

Table 15

Referring to fig. 15, the optical lens 10 of the present embodiment can be applied to an image capturing module 100 of the present embodiment. The image capturing module 100 includes a photosensitive element 20 and the optical lens 10 of any of the embodiments. The photosensitive element 20 is disposed on the image side of the optical lens 10, as shown in fig. 15, the image capturing module 100 is a periscopic image capturing module.

The photosensitive element 20 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled Device (CCD).

Referring to fig. 16, the image capturing module 100 according to the embodiment of the present disclosure can be applied to the electronic device 1000 according to the embodiment of the present disclosure. The electronic device 1000 includes a housing 200 and an image capturing module 100, wherein the image capturing module 100 is mounted on the housing 200.

The electronic device 1000 according to the embodiment of the present application can be applied to a vehicle-mounted, automatic driving and monitoring device, wherein the electronic device 1000 includes, but is not limited to, an imaging-enabled electronic device such as a car recorder, a smart phone, a tablet computer, a notebook computer, an electronic book reader, a Portable Multimedia Player (PMP), a portable phone, a video phone, a digital still camera, a mobile medical device, and a wearable device.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An optical lens, comprising, in order from an object side to an image side along an optical axis:

a prism having a reflective surface;

a first lens element with positive refractive power;

a second lens element with negative refractive power;

a third lens element with refractive power;

a fourth lens element with refractive power;

wherein the optical lens satisfies the following conditional expression:

-4.5<f12/f234<-2；

2. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:

3.3°/mm<CRA1/(2*SD42)<6.3°/mm；

3. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:

0.5<ET3/(|SAG31|+|SAG32|)<6；

4. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:

SDmax/SDmin<1.45；

5. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:

0.5<R22/(CT2+AT23)<3.5；

6. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:

0.5mm^-1<f1/(R11*CT1)<2.5mm^-1；

7. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:

1mm^-1<FNO/SD11<3mm^-1；

8. An optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:

0.65<SD42/ImgH<0.95；

9. An image capturing module, comprising:

an optical lens according to any one of claims 1 to 8; and

a light sensing element disposed on an image side of the optical lens.

10. An electronic device, comprising:

a housing; and

the image capturing module of claim 9, wherein the image capturing module is mounted on the housing.