CN212540856U

CN212540856U - Optical system, lens module and electronic equipment

Info

Publication number: CN212540856U
Application number: CN202021691651.7U
Authority: CN
Inventors: 王妮妮; 刘彬彬; 李明; 邹海荣
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-02-12
Anticipated expiration: 2030-08-13

Abstract

An optical system, a lens module and an electronic device, wherein the optical system comprises a first lens, a second lens and a third lens in sequence from an object side to an image side along an optical axis direction, the first lens has positive refractive power, and a near-optical axis region and a near-circumference region of an object side surface of the first lens are convex surfaces; the second lens element to the sixth lens element have refractive power; the optical system satisfies the conditional expression: (Y62 xTL)/(ET 6 f) is not more than 3 and not more than 10; wherein Y62 is the maximum optical effective radius of the image-side surface of the sixth lens element, TL is the on-axis distance from the object-side surface of the first lens element to the image-side surface of the optical system, ET6 is the thickness of the edge of the sixth lens element in the optical axis direction, and f is the effective focal length of the optical system. By arranging the six-piece lens structure, the refractive powers and the surface shapes of the six optical lenses are reasonably configured, and the optical system meets the relational expression, so that the high-quality imaging quality is ensured, and the telephoto characteristic and the light weight are realized.

Description

Optical system, lens module and electronic equipment

Technical Field

The utility model belongs to the technical field of optical imaging, especially, relate to an optical system, camera lens module and electronic equipment.

Background

In recent years, various long-focus lens patterns have been developed to meet the requirements of shooting far scenes, highlight main imaging objects with shallow depth of field, match with high-pixel and small-size chips, and achieve high-focus lens patterns. The existing three-piece, four-piece and five-piece lens modules are difficult to reduce in size and small in size, and the quality of shot remote detail imaging is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an optical system, camera lens module and electronic equipment, when can guaranteeing the high-quality image quality of system, can realize the frivolousness of long burnt characteristic and camera lens module again.

For realizing the purpose of the utility model, the utility model provides a following technical scheme:

in a first aspect, the present invention provides an optical system, which includes, in order from an object side to an image side along an optical axis direction: the first lens element with positive refractive power has a convex object-side surface near-optical axis region and a convex near-circumference region; a second lens element with refractive power; a third lens element with refractive power; a fourth lens element with refractive power; a fifth lens element with refractive power; a sixth lens element with refractive power; the optical system satisfies the conditional expression: (Y62 xTL)/(ET 6 f) is not more than 3 and not more than 10; wherein Y62 is a maximum optical effective radius of the image-side surface of the sixth lens element, TL is an on-axis distance from the object-side surface of the first lens element to the image plane of the optical system, ET6 is a thickness of an edge of the sixth lens element in an optical axis direction, and f is an effective focal length of the optical system. The optical system long-focus characteristic and the thickness of the optical pick-up lens can be balanced by satisfying the relational expression, and the maximum diameter of the optical pick-up lens is reduced while the imaging quality of the sixth lens is ensured.

By arranging the six-piece lens structure, the refractive powers and the surface shapes of the six optical lenses are reasonably configured, and the optical system meets the relational expression, so that the high-quality imaging quality is ensured, and the telephoto characteristic and the light weight are realized.

In one embodiment, the optical system satisfies: the object side surfaces of the third lens near-circumference regions are convex surfaces, and the image side surfaces of the third lens near-circumference regions are concave surfaces; the object side surfaces of the near-circumference regions of the fourth lens are all concave surfaces, and the image side surfaces of the near-circumference regions of the fourth lens are all convex surfaces; the object side surfaces of the near-circumference regions of the fifth lens are all concave surfaces, and the image side surfaces of the near-circumference regions of the fifth lens are all convex surfaces; the object side surface of the near-circumference area of the sixth lens is a concave surface, and the image side surface of the near-circumference area of the sixth lens is a convex surface. By reasonably configuring the surface shapes of the third lens to the sixth lens, the long-focus characteristic of the optical system is favorably realized.

In one embodiment, the optical system satisfies the conditional expression: TL/EPD is more than or equal to 1.5 and less than or equal to 3; furthermore, TL/EPD is more than or equal to 1.905 and less than or equal to 2.82; wherein EPD is an entrance pupil diameter of the optical system. Satisfying the above relation, the total length of the optical system can be made smaller and the amount of light entering can be increased.

In one embodiment, the optical system satisfies the conditional expression: less than or equal to 8 (| AL1S1| + | AL2S1|)/f is less than or equal to 12; further, 8.552(°/mm) ≦ (| AL1S1| + | AL2S1|)/f ≦ 11.352(°/mm); the first lens body comprises a first lens body and a second lens body, wherein the first lens body is provided with an effective diameter on the object side surface, the effective diameter on the object side surface of the first lens body is internally provided with a tangent plane, the tangent plane is intersected with a plane perpendicular to the optical axis to form an acute included angle, the maximum value of the acute included angle is AL1S1, the effective diameter on the object side surface of the second lens body is internally provided with a tangent plane, the tangent plane is intersected with the plane perpendicular to the optical axis to form an acute included angle. Satisfying the above relation, the first lens production sensitivity can be reduced, and the telephoto characteristic can be realized.

In one embodiment, the optical system satisfies the conditional expression: MVd/f is more than or equal to 5 and less than or equal to 10; further, 6.057(1/mm) is not less than MVd/f is not less than 9.052 (1/mm); wherein, MVd is the average value of Abbe numbers of six lenses of the optical system. The chromatic aberration can be balanced by satisfying the relational expression, the high Abbe number and the low Abbe number correspond to different refractive indexes, and the long-focus characteristic and the optical imaging performance can be realized by combining different materials.

In one embodiment, the optical system satisfies the conditional expression: ET1/(CT1 f) is not less than 0(1/mm) and not more than 0.5 (1/mm); further, 0.041(1/mm) ≦ ET1/(CT1 f) ≦ 0.098 (1/mm); wherein ET1 is a thickness of the first lens edge in an optical axis direction, and CT1 is a thickness of the first lens center in the optical axis direction. Satisfying the above relation can facilitate imaging of the first lens and realize a telephoto characteristic.

In one embodiment, the optical system satisfies the conditional expression: ET6/(CT6 f) is not less than 0(1/mm) and not more than 0.5 (1/mm); further, 0.045(1/mm) ≦ ET6/(CT6 × f) ≦ 0.152 (1/mm); wherein CT6 is a thickness of the sixth lens element in the optical axis direction. Satisfying the above relational expression is advantageous for imaging of the sixth lens and realizing a telephoto characteristic.

In one embodiment, the optical system satisfies the conditional expression: EPD/f is more than or equal to 0.3 and less than or equal to 0.6; further, EPD/f is more than or equal to 0.352 and less than or equal to 0.513; wherein EPD is an entrance pupil diameter of the optical system. Satisfying the above relational expression, the light flux amount and the image plane retrogradation can be balanced, and the large aperture and the telephoto characteristics can be realized.

In one embodiment, the optical system satisfies the conditional expression: the absolute value of SAG 32/CT 34 is more than or equal to 0 and less than or equal to 0.35; further, 0.015 is less than or equal to 0.015, SAG 32/CT 34 is less than or equal to 0.333; SAG32 is the distance between the projection of the edge of the effective area of the image side surface of the third lens on the optical axis and the intersection point of the image side surface of the third lens and the optical axis, and CT34 is the air space distance between the third lens and the fourth lens on the optical axis. The optical structure is reasonably distributed, so that the direction change of light rays entering the optical system can be slowed down, the intensity of stray light is favorably reduced, the sensitivity of the optical system is reduced, and the yield of the third lens is improved.

In one embodiment, the optical system satisfies the conditional expression: the absolute value of SAG 41/CT 34 is more than or equal to 0 and less than or equal to 0.75; further, 0.238 is less than or equal to 0.7 of | SAG41|/CT 34; SAG41 is the distance between the projection of the edge of the effective area of the object side surface of the fourth lens on the optical axis and the intersection point of the object side surface of the lens and the optical axis, and CT34 is the air space distance between the third lens and the fourth lens on the optical axis. The optical structure is reasonably distributed, so that the direction change of light rays entering the optical system can be slowed down, the ghost image intensity can be reduced, the sensitivity of the optical system is reduced, and the yield of the fourth lens is improved.

In one embodiment, the optical system satisfies the conditional expression: TL/ImgH is more than or equal to 2 and less than or equal to 3; furthermore, TL/ImgH is more than or equal to 2.143 and less than or equal to 2.471; wherein ImgH is half of the image height corresponding to the maximum field angle of the optical system. The relational expression is satisfied, and the light and thin of the camera lens module is favorably realized.

In a second aspect, the present invention further provides a lens module, which includes the optical system of any one of the embodiments of the first aspect. Through adding in the lens module the utility model provides an optical system for the lens module has long focus, high pixel and frivolous characteristics.

A third aspect, the present invention further provides an electronic device, which includes a housing and a second aspect, wherein the lens module is disposed in the housing. Through adding in electronic equipment the utility model provides a lens module for electronic equipment has the characteristics of high pixel, long focus and frivolousization.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1a is a schematic structural diagram of an optical system of a first embodiment;

FIG. 1b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the first embodiment;

FIG. 2a is a schematic structural diagram of an optical system of a second embodiment;

FIG. 2b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the second embodiment;

FIG. 3a is a schematic structural diagram of an optical system of a third embodiment;

FIG. 3b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the third embodiment;

FIG. 4a is a schematic structural diagram of an optical system of a fourth embodiment;

FIG. 4b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the fourth embodiment;

FIG. 5a is a schematic structural diagram of an optical system of a fifth embodiment;

fig. 5b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the fifth embodiment.

FIG. 6a is a schematic structural diagram of an optical system of a sixth embodiment;

FIG. 6b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the sixth embodiment;

FIG. 7a is a schematic structural diagram of an optical system of a seventh embodiment;

fig. 7b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the seventh embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

The embodiment of the utility model provides a lens module, this lens module include the lens cone with the embodiment of the utility model provides an optical system, optical system's first lens to sixth lens are installed in the lens cone. The lens module can be an independent lens of a digital camera, and can also be an imaging module integrated on electronic equipment such as an industrial bar code scanner and the like. Through adding in the camera lens module the utility model provides an optical system for the camera lens module has the characteristics of high pixel, long focus and frivolousization.

An embodiment of the utility model provides an electronic equipment, this electronic equipment include the casing with the embodiment of the utility model provides a lens module, lens module set up in the casing. Furthermore, the electronic device may further include an electronic photosensitive element, a photosensitive surface of the electronic photosensitive element is located on an image surface of the optical system, and light rays incident on the photosensitive surface of the electronic photosensitive element through the first lens to the sixth lens may be converted into electrical signals of an image. The electron sensor may be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge-coupled Device (CCD). This electronic equipment can be for industry bar code scanner, smart mobile phone, Personal Digital Assistant (PDA), panel computer, intelligent wrist-watch, unmanned aerial vehicle, electronic books read ware, vehicle event data recorder, wearable device, watch-dog, security protection camera equipment, medical treatment camera equipment, production assembly camera equipment etc.. Through adding in electronic equipment the utility model provides a lens module for electronic equipment both has high pixel, has long burnt characteristic and frivolous characteristics again.

The present invention provides an optical system including, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. Any adjacent two lenses of the first to sixth lenses may have an air space therebetween.

Specifically, the specific shape and structure of the six lenses are as follows: the first lens element with positive refractive power has a convex object-side surface near-optical axis region and a convex near-circumference region; the second lens element to the sixth lens element have refractive power; the optical system satisfies the conditional expression: (Y62 xTL)/(ET 6 f) is not more than 3 and not more than 10; further, 3.414 ≦ (Y62 × TL)/(ET6 × f) 8.4 or less; wherein Y62 is a maximum effective radius of an image-side surface of the sixth lens element, TL is an on-axis distance from an object-side surface of the first lens element to an image plane of the optical system, ET6 is a thickness of an edge of the sixth lens element in an optical axis direction, and f is an effective focal length of the optical system. The long-focus characteristic of the optical system and the thickness of the optical pick-up lens can be balanced, and the maximum diameter of the optical pick-up lens is reduced while the imaging rate of the sixth lens is ensured.

The optical system further includes a diaphragm, which may be disposed on the object-side surface or the image-side surface of the first lens to the sixth lens, or may be disposed at any position between any two lenses, such as the diaphragm disposed on the object-side surface of the first lens in this embodiment.

An infrared cut-off filter can be arranged between the sixth lens and the imaging surface and is used for transmitting visible light wave bands and cutting off infrared light wave bands, so that the phenomenon of false color or ripple caused by interference of light waves in non-working wave bands is avoided, and meanwhile, the effective resolution and the color reducibility can be improved.

By arranging the six-piece lens structure, the refractive power and the surface type of the six optical lenses are reasonably configured, and the optical system meets the relational expression, so that the high imaging quality is ensured, and the long-focus characteristic and the light and thin property of the optical system can be realized.

In one embodiment, an optical system satisfies: the object side surfaces of the third lens near-circumference regions are convex surfaces, and the image side surfaces of the third lens near-circumference regions are concave surfaces; the object side surfaces of the near-circumference regions of the fourth lens are all concave surfaces, and the image side surfaces of the near-circumference regions of the fourth lens are all convex surfaces; the object side surfaces of the near-circumference regions of the fifth lens are all concave surfaces, and the image side surfaces of the near-circumference regions of the fifth lens are all convex surfaces; the object side surface of the near-circumference area of the sixth lens is a concave surface, and the image side surface of the near-circumference area of the sixth lens is a convex surface. By reasonably configuring the surface shapes of the third lens, the sixth lens and the fourth lens, the long-focus characteristic of the optical system is favorably realized.

In one embodiment, the optical system satisfies the conditional expression: TL/EPD is more than or equal to 1.5 and less than or equal to 3; furthermore, TL/EPD is more than or equal to 1.905 and less than or equal to 2.82; where EPD is the entrance pupil diameter of the optical system. Satisfying the above relation, the total length of the optical system can be made smaller and the amount of light entering can be increased.

In one embodiment, the optical system satisfies the conditional expression: less than or equal to 8(°/mm) (| AL1S1| + | AL2S1|)/f is less than or equal to 12(°/mm); further, 8.552(°/mm) ≦ (| AL1S1| + | AL2S1|)/f ≦ 11.352(°/mm); the first lens body is provided with an effective diameter on the object side surface, the effective diameter on the object side surface is provided with a tangent plane, the tangent plane intersects with a plane perpendicular to the optical axis to form an acute angle, the maximum value of the acute angle is AL1S1, the effective diameter on the object side surface is provided with a tangent plane, the tangent plane intersects with a plane perpendicular to the optical axis to form an acute angle, and the maximum value of the acute angle is AL1S 2. Satisfying the above relation, the first lens production sensitivity can be reduced, and the telephoto characteristic can be realized.

In one embodiment, the optical system satisfies the conditional expression: MVd/f is more than or equal to 5(1/mm) and less than or equal to 10 (1/mm); further, 6.057(1/mm) is not less than MVd/f is not less than 9.052 (1/mm); the MVd is an average value of abbe numbers of six lenses of the optical system. The chromatic aberration can be balanced by satisfying the relational expression, the high Abbe number and the low Abbe number correspond to different refractive indexes, and the long-focus characteristic and the optical imaging performance can be realized by combining different materials.

In one embodiment, the optical system satisfies the conditional expression: ET1/(CT1 f) is not less than 0(1/mm) and not more than 0.5 (1/mm); further, 0.041(1/mm) ≦ ET1/(CT1 f) ≦ 0.098 (1/mm); wherein ET1 is the thickness of the first lens edge in the optical axis direction, and CT1 is the thickness of the first lens center in the optical axis direction. Satisfying the above relation can be beneficial to the imaging of the first lens and realize the tele characteristic.

In one embodiment, the optical system satisfies the conditional expression: ET6/(CT6 f) is not less than 0(1/mm) and not more than 0.5 (1/mm); further, 0.045(1/mm) ≦ ET6/(CT6 × f) ≦ 0.152 (1/mm); here, CT6 is the thickness of the sixth lens element in the optical axis direction. Satisfying the above relational expression can facilitate imaging of the sixth lens and realize a telephoto characteristic.

In one embodiment, the optical system satisfies the conditional expression: EPD/f is more than or equal to 0.3 and less than or equal to 0.6; further, EPD/f is more than or equal to 0.352 and less than or equal to 0.513; where EPD is the entrance pupil diameter of the optical system. Satisfying the above relation, the light flux and the image plane can be balanced to move backward, realizing the large aperture and the long focus characteristic.

In one embodiment, the optical system satisfies the conditional expression: the absolute value of SAG 32/CT 34 is more than or equal to 0 and less than or equal to 0.35; further, 0.015 is less than or equal to 0.015, SAG 32/CT 34 is less than or equal to 0.333; SAG32 is the distance between the projection of the edge of the effective area of the image side surface of the third lens on the optical axis and the intersection point of the image side surface of the third lens and the optical axis, and CT34 is the air space distance between the third lens and the fourth lens on the optical axis. The optical structure is reasonably distributed, so that the direction change of light rays entering the optical system can be slowed down, the intensity of stray light is favorably reduced, the sensitivity of the optical system is reduced, and the yield of third lenses is improved.

In one embodiment, the optical system satisfies the conditional expression: the absolute value of SAG 41/CT 34 is more than or equal to 0 and less than or equal to 0.75; further, 0.238 is less than or equal to 0.7 of | SAG41|/CT 34; SAG41 is the distance from the projection of the edge of the effective area of the object side surface of the fourth lens on the optical axis to the intersection point of the object side surface of the fourth lens and the optical axis, and CT34 is the air separation distance between the third lens and the fourth lens on the optical axis. Satisfying above-mentioned relational expression, the reasonable overall arrangement of accessible optical structure slows down the direction change behind the light entering optical system, helps reducing the intensity of ghost image, reduces optical system's sensitivity, improves the yield of producing the fourth lens.

In one embodiment, the optical system satisfies the conditional expression: TL/ImgH is more than or equal to 2 and less than or equal to 3; furthermore, TL/ImgH is more than or equal to 2.143 and less than or equal to 2.471; here, ImgH is half the image height corresponding to the maximum field angle of the optical system. Satisfy above-mentioned relational expression, be favorable to realizing making a video recording the frivolousization of lens group.

First embodiment

Referring to fig. 1a and fig. 1b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis, includes:

the first lens element L1 with positive refractive power has a convex object-side surface S1 of the first lens element L1 in a paraxial region and a convex near-circumferential region, and the image-side surface S2 of the first lens element L1 in a paraxial region and a concave near-circumferential region;

the second lens element L2 with positive refractive power has a convex object-side surface S3 of the second lens element L2 and convex near-axis and near-circumference regions, and has a convex image-side surface S4 of the second lens element L2 and convex near-axis and near-circumference regions;

the third lens element L3 with negative refractive power has a convex paraxial region and a concave peripheral region of the object-side surface S5 of the third lens element L3, and has a concave paraxial region and a concave peripheral region of the image-side surface S6 of the third lens element L3;

the fourth lens element L4 with positive refractive power has a concave paraxial region and a concave peripheral region of the object-side surface S7 of the fourth lens element L4, and has a convex paraxial region and a convex peripheral region of the image-side surface S8 of the fourth lens element L4;

the fifth lens element L5 with negative refractive power has a concave object-side surface S9 at a paraxial region and a concave near-circumferential region of the fifth lens element L5, and has a concave image-side surface S10 at a paraxial region and a convex near-circumferential region of the fifth lens element L5;

the sixth lens element L6 with positive refractive power has a convex object-side surface S11 near-optical axis region and a concave near-circumferential region of the sixth lens element L6, and both the image-side surface S12 near-optical axis region and the near-circumferential region of the sixth lens element L6 are convex.

The first lens element L1 to the sixth lens element L6 are all made of Plastic (Plastic) and are all aspheric. Further, the optical system includes a diaphragm ST0, an infrared cut filter IR, and an imaging surface IMG. The stop STO is provided on the object side surface of the first lens L1 for controlling the amount of light entering. In other embodiments, the stop STO can be disposed between two adjacent lenses, or on other lenses. The infrared cut filter IR is disposed on the image side of the sixth lens L6, and includes an object side surface S13 and an image side surface S14, and is configured to filter infrared light, so that the light incident on the imaging surface IMG is visible light with a wavelength of 380nm to 780 nm. The material of the infrared cut filter IR is GLASS (GLASS), and the GLASS can be coated with a film. The effective pixel area of the electronic photosensitive element is positioned on the imaging surface IMG.

Table 1a shows a table of characteristics of the optical system of the present embodiment in which the units of the Y radius, thickness, and focal length are all millimeters (mm).

TABLE 1a

Wherein f is the effective focal length of the optical system, FNO is the f-number of the optical system, and FOV is the maximum field angle of the optical system.

In the present embodiment, the object-side surface and the image-side surface of the first lens L1 through the sixth lens L6 are aspheric, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius R of Y in table 1a above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 1b shows the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors S3-S12 in the first embodiment.

TABLE 1b

Fig. 1b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the first embodiment. The longitudinal spherical aberration curve represents the deviation of the convergence focus of the light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 1b, the optical system according to the first embodiment can achieve good imaging quality.

Second embodiment

Referring to fig. 2a and fig. 2b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:

the second lens element L2 with positive refractive power has a convex paraxial region and a concave peripheral region of the object-side surface S3 of the second lens element L2, and has a convex paraxial region and a concave peripheral region of the image-side surface S4 of the second lens element L2;

the third lens element L3 with negative refractive power has a convex object-side surface S5 at a paraxial region and a concave peripheral region of the third lens element L3, and has a concave image-side surface S6 at a paraxial region and a concave peripheral region of the third lens element L3;

the fourth lens element L4 with negative refractive power has a concave object-side surface S7 and a convex near-axis region and a concave near-circumferential region of the fourth lens element L4, and has a convex image-side surface S8 and a convex near-circumferential region of the fourth lens element L4;

the fifth lens element L5 with negative refractive power has a convex object-side surface S9 in a paraxial region and a concave near-circumferential region of the fifth lens element L5, and has a concave image-side surface S10 in a paraxial region and a convex near-circumferential region of the fifth lens element L5;

the sixth lens element L6 with positive refractive power has a convex object-side surface S11 of the sixth lens element L6 in the paraxial region thereof and a concave near-circumferential region thereof, and has a concave image-side surface S12 of the sixth lens element L6 in the paraxial region thereof and a convex near-circumferential region thereof.

Other structures of the second embodiment are the same as those of the first embodiment, and reference may be made thereto.

Table 2a shows a table of characteristics of the optical system of the present embodiment, in which the units of the Y radius, the thickness, and the focal length are all millimeters (mm).

TABLE 2a

Wherein the values of the parameters in Table 2a are the same as those of the first embodiment.

Table 2b gives the coefficients of high order terms that can be used for each aspherical mirror in the second embodiment, wherein each aspherical mirror type can be defined by the formula given in the first embodiment.

TABLE 2b

FIG. 2b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the second embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 2b, the optical system according to the second embodiment can achieve good imaging quality.

Third embodiment

Referring to fig. 3a and 3b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:

the first lens element L1 with positive refractive power has a convex object-side surface S1 of the first lens element L1 in a paraxial region and a convex near-circumferential region, and has a concave image-side surface S2 of the first lens element L1 in a paraxial region and a concave near-circumferential region;

the second lens element L2 with positive refractive power has a convex object-side surface S3 of the second lens element L2 in a paraxial region and a convex near-circumferential region, and has a concave image-side surface S4 of the second lens element L2 in a paraxial region and a convex near-circumferential region;

the third lens element L3 with negative refractive power has a concave object-side surface S5 near-optical axis region and a convex near-circumference region of the third lens element L3, and has a convex image-side surface S6 near-optical axis region and a concave near-circumference region of the third lens element L3;

the fifth lens element L5 with negative refractive power has a concave object-side surface S9 near-optical axis region and a concave near-circumference region of the fifth lens element L5, and a convex image-side surface S10 near-optical axis region and a convex near-circumference region of the fifth lens element L5;

the sixth lens element L6 with negative refractive power has a concave object-side surface S11 in the paraxial region and the near-circumferential region of the sixth lens element L6, and a convex image-side surface S12 in the paraxial region and the near-circumferential region of the sixth lens element L6.

Other structures of the third embodiment are the same as those of the first embodiment, and reference may be made thereto.

Table 3a shows a table of characteristics of the optical system of the present embodiment in which the units of the Y radius, thickness, and focal length are all millimeters (mm).

TABLE 3a

Wherein the values of the parameters in Table 3a are the same as those of the first embodiment.

Table 3b gives the coefficients of high-order terms that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 3b

FIG. 3b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the third embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 3b, the optical system according to the third embodiment can achieve good imaging quality.

Fourth embodiment

Referring to fig. 4a and 4b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:

the second lens element L2 with positive refractive power has a convex object-side surface S3 of the second lens element L2 in a paraxial region and a convex near-circumferential region, and has a concave image-side surface S4 of the second lens element L2 in a paraxial region and a concave near-circumferential region;

the third lens element L3 with negative refractive power has a concave object-side surface S5 of the third lens element L3 in a paraxial region thereof, a convex near-circumferential region thereof, and a concave image-side surface S6 of the third lens element L3 in a paraxial region and a concave near-circumferential region thereof;

the fourth lens element L4 with negative refractive power has a convex object-side surface S7 in a paraxial region and a concave near-circumferential region of the fourth lens element L4, and has a concave image-side surface S8 in a paraxial region and a convex near-circumferential region of the fourth lens element L4;

the sixth lens element L6 with negative refractive power has a convex object-side surface S11 in the paraxial region and a concave near-circumferential region of the sixth lens element L6, and has a concave image-side surface S12 in the paraxial region and a convex near-circumferential region of the sixth lens element L6.

Other structures of the fourth embodiment are the same as those of the first embodiment, and reference may be made thereto.

Table 4a shows a table of characteristics of the optical system of the present embodiment in which the units of the Y radius, thickness, and focal length are all millimeters (mm).

TABLE 4a

Wherein the values of the parameters in Table 4a are the same as those of the first embodiment.

Table 4b gives the coefficients of high-order terms that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 4b

FIG. 4b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the fourth embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 4b, the optical system according to the fourth embodiment can achieve good imaging quality.

Fifth embodiment

Referring to fig. 5a and 5b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:

the first lens element L1 with positive refractive power has a convex object-side surface S1 of the first lens element L1 in a paraxial region and a convex near-circumferential region, and has a convex image-side surface S2 of the first lens element L1 in a paraxial region and a convex near-circumferential region;

the second lens element L2 with negative refractive power has a concave object-side surface S3 of the second lens element L2 in a paraxial region and a concave near-circumferential region, and has a concave image-side surface S4 of the second lens element L2 in a paraxial region and a convex near-circumferential region;

the third lens element L3 with negative refractive power has a concave object-side surface S5 with a concave paraxial region and a convex paraxial region of the third lens element L3, and an image-side surface S6 with a concave paraxial region and a concave peripheral region of the third lens element L3;

the fourth lens element L4 with positive refractive power has a convex object-side surface S7 of the fourth lens element L4 in the paraxial region thereof and a concave near-circumferential region thereof, and has a concave image-side surface S8 of the fourth lens element L4 in the paraxial region thereof and a convex near-circumferential region thereof;

the sixth lens element L6 with positive refractive power has a convex object-side surface S11 in the paraxial region and a concave near-circumferential region of the sixth lens element L6, and has a concave image-side surface S12 in the paraxial region and a convex near-circumferential region of the sixth lens element L6.

The other structure of the fifth embodiment is the same as that of the first embodiment, and reference may be made thereto.

Table 5a shows a table of characteristics of the optical system of the present embodiment, in which the units of the Y radius, the thickness, and the focal length are all millimeters (mm).

TABLE 5a

Wherein the meanings of the parameters in Table 5a are the same as those of the first embodiment.

Table 5b shows the high-order term coefficients that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 5b

FIG. 5b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the fifth embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 5b, the optical system according to the fifth embodiment can achieve good image quality.

Sixth embodiment

Referring to fig. 6a and 6b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:

the fourth lens element L4 with positive refractive power has a concave object-side surface S7 near-optical axis region and a concave near-circumference region of the fourth lens element L4, and a convex image-side surface S8 near-optical axis region and a convex near-circumference region of the fourth lens element L4;

the fifth lens element L5 with positive refractive power has a concave object-side surface S9 near-optical axis region and a concave near-circumference region of the fifth lens element L5, and a convex image-side surface S10 near-optical axis region and a convex near-circumference region of the fifth lens element L5;

the sixth lens element L6 with negative refractive power has a concave object-side surface S11 in a paraxial region and a concave near-circumferential region of the sixth lens element L6, and has a concave image-side surface S12 in a paraxial region and a convex near-circumferential region of the sixth lens element L6.

Other structures of the sixth embodiment are the same as those of the first embodiment, and reference may be made thereto.

Table 6a shows a table of characteristics of the optical system of the present embodiment, in which the units of the Y radius, the thickness, and the focal length are all millimeters (mm).

TABLE 6a

Wherein the values of the parameters in Table 6a are the same as those of the first embodiment.

Table 6b shows the high-order term coefficients that can be used for each aspherical mirror surface in the sixth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 6b

FIG. 6b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the sixth embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 6b, the optical system according to the sixth embodiment can achieve good image quality.

Seventh embodiment

Referring to fig. 7a and 7b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:

the first lens element L1 with positive refractive power has a convex object-side surface S1 of the first lens element L1 in a paraxial region and a convex near-circumferential region, and has a concave image-side surface S2 of the first lens element L1 in a paraxial region and a convex near-circumferential region;

the second lens element L2 with negative refractive power has a convex object-side surface S3 of the second lens element L2 in a paraxial region and a convex near-circumferential region, and has a concave image-side surface S4 of the second lens element L2 in a paraxial region and a convex near-circumferential region;

the third lens element L3 with positive refractive power has a convex object-side surface S5 of the third lens element L3 in a paraxial region and a convex near-circumferential region, and has a concave image-side surface S6 of the third lens element L3 in a paraxial region and a concave near-circumferential region;

the sixth lens element L6 with positive refractive power has a concave object-side surface S11 in the paraxial region and the near-circumferential region of the sixth lens element L6, and a convex image-side surface S12 in the paraxial region and the near-circumferential region of the sixth lens element L6.

The other structure of the seventh embodiment is the same as that of the first embodiment, and reference may be made thereto.

Table 7a shows a table of characteristics of the optical system of the present embodiment, in which the units of the Y radius, the thickness, and the focal length are all millimeters (mm).

TABLE 7a

Wherein the meanings of the parameters in Table 7a are the same as those of the first embodiment.

Table 7b shows the high-order term coefficients that can be used for each aspherical mirror surface in the seventh embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.

TABLE 7b

FIG. 7b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the seventh embodiment, wherein the longitudinal spherical aberration curves represent the convergent focus deviations of light rays of different wavelengths after passing through the lenses of the optical system; the astigmatism curves represent meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 7b, the optical system according to the seventh embodiment can achieve good image quality.

Table 8 shows values of (Y62 TL)/(ET6 f), TL/EPD, (| AL1S1| + | AL2S1|)/f, MVd/f, ET1/(CT 1|, ET6/(CT6 |, EPD/f, | SAG32|/CT34, | SAG41|/CT34, and TL/ImgH in the optical systems of the first to seventh embodiments.

TABLE 8

	(Y62TL)/(ET6f)	TL/EPD	(\|AL1S1\|+\|AL2S1\|)/f	MVd/f	ET1/(CT1*f)
						First embodiment	7.499	1.998	8.972	6.497	0.043
Second embodiment	3.414	2.82	9.281	9.052	0.098
						Third embodiment	3.843	2.516	9.164	6.057	0.065
Fourth embodiment	3.418	2.744	10.816	8.938	0.098
						Fifth embodiment	5.856	2.78	8.552	8.848	0.089
Sixth embodiment	8.4	1.905	11.352	6.472	0.054
						Seventh embodiment	7.492	1.952	9.09	6.363	0.041
	ET6/(CT6*f)	EPD/f	\|SAG32\|/CT34	\|SAG41\|/CT34	TL/ImgH
						First embodiment	0.045	0.463	0.025	0.375	2.143
Second embodiment	0.121	0.357	0.015	0.238	2.299
						Third embodiment	0.090	0.4	0.239	0.7	2.471
Fourth embodiment	0.152	0.352	0.05	0.305	2.167
						Fifth embodiment	0.118	0.357	0.061	0.433	2.243
Sixth embodiment	0.067	0.513	0.152	0.386	2.244
						Seventh embodiment	0.053	0.473	0.333	0.362	2.165

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims

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

the first lens element with positive refractive power has a convex object-side surface near-optical axis region and a convex near-circumference region;

a second lens element with refractive power;

a third lens element with refractive power;

a fourth lens element with refractive power;

a fifth lens element with refractive power;

a sixth lens element with refractive power;

the optical system satisfies the conditional expression: (Y62 xTL)/(ET 6 f) is not more than 3 and not more than 10; wherein Y62 is a maximum optical effective radius of the image-side surface of the sixth lens element, TL is an on-axis distance from the object-side surface of the first lens element to the image plane of the optical system, ET6 is a thickness of an edge of the sixth lens element in an optical axis direction, and f is an effective focal length of the optical system.

2. The optical system according to claim 1, wherein the optical system satisfies:

the object side surfaces of the third lens near-circumference regions are convex surfaces, and the image side surfaces of the third lens near-circumference regions are concave surfaces;

the object side surfaces of the near-circumference regions of the fourth lens are all concave surfaces, and the image side surfaces of the near-circumference regions of the fourth lens are all convex surfaces;

the object side surfaces of the near-circumference regions of the fifth lens are all concave surfaces, and the image side surfaces of the near-circumference regions of the fifth lens are all convex surfaces;

the object side surface of the near-circumference area of the sixth lens is a concave surface, and the image side surface of the near-circumference area of the sixth lens is a convex surface.

3. The optical system according to claim 1 or 2, wherein the optical system satisfies a conditional expression:

1.5≤TL/EPD≤3；

wherein EPD is an entrance pupil diameter of the optical system.

4. The optical system according to claim 1 or 2, wherein the optical system satisfies a conditional expression:

8(°/mm)≤(|AL1S1|+|AL2S1|)/f≤12(°/mm)；

the first lens body comprises a first lens body and a second lens body, wherein the first lens body is provided with an effective diameter on the object side surface, the effective diameter on the object side surface of the first lens body is internally provided with a tangent plane, the tangent plane is intersected with a plane perpendicular to the optical axis to form an acute included angle, the maximum value of the acute included angle is AL1S1, the effective diameter on the object side surface of the second lens body is internally provided with a tangent plane, the tangent plane is intersected with the plane perpendicular to the optical axis to form an acute included angle.

5. The optical system according to claim 1 or 2, wherein the optical system satisfies a conditional expression:

5(1/mm)≤MVd/f≤10(1/mm)；

wherein, MVd is the average value of Abbe numbers of six lenses of the optical system.

6. The optical system according to claim 1 or 2, wherein the optical system satisfies a conditional expression:

0(1/mm)≤ET1/(CT1*f)≤0.5(1/mm)；

wherein ET1 is a thickness of the first lens edge in an optical axis direction, and CT1 is a thickness of the first lens center in the optical axis direction.

7. The optical system according to claim 1 or 2, wherein the optical system satisfies a conditional expression:

0(1/mm)≤ET6/(CT6*f)≤0.5(1/mm)；

wherein CT6 is a thickness of the sixth lens element in the optical axis direction.

8. The optical system according to claim 1 or 2, wherein the optical system satisfies a conditional expression:

0.3≤EPD/f≤0.6；

wherein EPD is an entrance pupil diameter of the optical system.

9. The optical system according to claim 1 or 2, wherein the optical system satisfies a conditional expression:

0≤|SAG32|/CT34≤0.35；

SAG32 is the distance between the projection of the edge of the effective area of the image side surface of the third lens on the optical axis and the intersection point of the image side surface of the third lens and the optical axis, and CT34 is the air space distance between the third lens and the fourth lens on the optical axis.

10. The optical system according to claim 1 or 2, wherein the optical system satisfies a conditional expression:

0≤|SAG41|/CT34≤0.75；

SAG41 is the distance between the projection of the edge of the effective area of the object side surface of the fourth lens on the optical axis and the intersection point of the object side surface and the optical axis of the fourth lens, and CT34 is the air space distance between the third lens and the fourth lens on the optical axis.

11. The optical system according to claim 1 or 2, wherein the optical system satisfies a conditional expression:

2≤TL/ImgH≤3；

wherein ImgH is half of the image height corresponding to the maximum field angle of the optical system.

12. A lens module comprising an electro-optic device and an optical system as claimed in any one of claims 1 to 11, wherein the electro-optic device is disposed on an image plane of the optical system.

13. An electronic apparatus, characterized in that the electronic apparatus comprises a housing and the lens module according to claim 12, the lens module being disposed in the housing.