WO2022033326A1 - Optical system, lens module, and electronic device - Google Patents

Abstract

The present application provides an optical system, a lens module, and an electronic device. The optical system sequentially comprises first to sixth lenses from an object side to an image side in an optical axis direction; the first lens has positive refractive power, and a paraxial region and a near circumferential region of an object side surface of the first lens are both convex surfaces; the second lens to the sixth lens all have refractive power; the optical system satisfies the conditional expression: 3≤(Y62*TL)/(ET6*f)≤10, wherein Y62 is the maximum optical effective radius of an image side surface of the sixth lens, TL is the on-axis distance from the object side surface of the first lens to an imaging surface of the optical system, ET6 is the thickness of the edge of the sixth lens in the optical axis direction, and f is the effective focal length of the optical system. By arranging a six-lens structure, the refractive power and the surface types of the six optical lenses are reasonably configured, and the optical system satisfies the relational expression above, so that the long-focus characteristic and lightness and thinness can be realized while the high-quality imaging quality is ensured.

Description

Optical systems, lens modules and electronics technical field

The present application belongs to the technical field of optical imaging, and in particular relates to an optical system, a lens module and an electronic device.

Background technique

In recent years, in order to meet the requirements of shooting distant scenes, with shallow depth of field and highlighting the main imaging object, and matching high-pixel and small-size chips, various lens styles with long focal lengths have emerged as the times require. However, the existing three-piece, four-piece and five-piece lens modules are not easy to reduce in size, difficult to miniaturize, and the image quality of shooting distant details is not good, and based on the same chip, in order to obtain higher image clarity, it will increase The total length of the lens, thus restricting the thinning of the lens.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide an optical system, a lens module and an electronic device, which can ensure the high-quality imaging quality of the system, and at the same time realize the telephoto characteristic and the lightness and thinness of the camera lens module.

To achieve the purpose of the application, the application provides the following technical solutions:

In a first aspect, the present invention provides an optical system, comprising in sequence from the object side to the image side along the optical axis direction: a first lens having a positive refractive power; The regions are all convex surfaces; the second lens, with refractive power; the third lens, with refractive power; the fourth lens, with refractive power; the fifth lens, with refractive power; the sixth lens, with refractive power; the optical system satisfies Conditional formula: 3≤(Y62*TL)/(ET6*f)≤10; wherein, Y62 is the maximum optical effective radius of the image side of the sixth lens, and TL is the distance from the object side of the first lens to the optical The on-axis distance of the imaging plane of the system, ET6 is the thickness of the edge of the sixth lens in the direction of the optical axis, and f is the effective focal length of the optical system. Satisfying the above relationship can balance the telephoto characteristic of the optical system and the thickness of the optical imaging lens, and reduce the maximum diameter of the optical imaging lens while ensuring the imaging quality of the sixth lens.

By setting up a six-piece lens structure, reasonably configuring the refractive power and surface shape of the six-piece optical lenses, and making the optical system satisfy the above-mentioned relationship, while ensuring high-quality imaging quality, it can also achieve telephoto characteristics and Thinner.

In one embodiment, the optical system satisfies: the object sides of the near-circumferential regions of the third lens are all convex surfaces, the image sides of the near-circumferential regions of the third lens are all concave surfaces; the near-circumferential regions of the fourth lens are all concave surfaces; The object sides of the fourth lens are all concave, and the image sides of the near-circumferential area of the fourth lens are convex; the object sides of the fifth lens near the circumference are concave, and the image sides of the near-circumferential area of the fifth lens are all concave surfaces. Convex; the object side surface of the near-circumferential region of the sixth lens is concave, and the image side of the sixth lens near-circumferential region is convex. By reasonably configuring the surface shapes of the third lens to the sixth lens, it is beneficial to realize the telephoto characteristic of the optical system.

In one embodiment, the optical system satisfies the conditional formula: 1.5≤TL/EPD≤3; further, 1.905≤TL/EPD≤2.82; wherein, EPD is the entrance pupil diameter of the optical system. Satisfying the above relationship can make the overall length of the optical system smaller and increase the amount of incoming light.

In one embodiment, the optical system satisfies the conditional formula: 8≤(|AL1S1|+|AL2S1|)/f≤12; further, 8.552(°/mm)≤(|AL1S1|+|AL2S1|)/ f≤11.352 (°/mm); wherein, there are tangent planes everywhere in the effective diameter of the object side of the first lens, and 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 It is AL1S1, and the second lens has tangent planes everywhere in the effective diameter of the object side surface, and the tangent planes intersect with a plane perpendicular to the optical axis to form an acute angle, and the maximum value of the acute angle is AL1S2. Satisfying the above relational expression, the production sensitivity of the first lens can be reduced, and the telephoto characteristic can be realized.

In one embodiment, the optical system satisfies the conditional formula: 5≤MVd/f≤10; further, 6.057(1/mm)≤MVd/f≤9.052(1/mm); wherein, MVd is the optical system The average of the Abbe numbers of the system's six lenses. Satisfying the above relationship can balance chromatic aberration, and high Abbe number and low Abbe number correspond to different refractive indices, and can achieve telephoto characteristics and optical imaging performance through different material combinations.

In one embodiment, the optical system satisfies the conditional formula: 0(1/mm)≤ET1/(CT1*f)≤0.5(1/mm); further, 0.041(1/mm)≤ET1/(CT1 *f)≤0.098(1/mm); wherein, ET1 is the thickness of the edge of the first lens in the direction of the optical axis, and CT1 is the thickness of the center of the first lens in the direction of the optical axis. Satisfying the above relational formula can facilitate the imaging of the first lens and achieve telephoto characteristics.

In one embodiment, the optical system satisfies the conditional formula: 0(1/mm)≤ET6/(CT6*f)≤0.5(1/mm); further, 0.045(1/mm)≤ET6/(CT6 *f)≤0.152(1/mm); wherein, CT6 is the thickness of the center of the sixth lens in the direction of the optical axis. Satisfying the above relational expression is beneficial to the imaging of the sixth lens and realizes the telephoto characteristic.

In one embodiment, the optical system satisfies the conditional formula: 0.3≤EPD/f≤0.6; further, 0.352≤EPD/f≤0.513; wherein, EPD is the entrance pupil diameter of the optical system. Satisfying the above relationship can balance the amount of light passing and the rearward shift of the image plane, and realize the characteristics of large aperture and telephoto.

In an embodiment, the optical system satisfies the conditional formula: 0≤|SAG32|/CT34≤0.35; further, 0.015≤|SAG32|/CT34≤0.333; wherein, SAG32 is the effective area on the image side of the third lens The distance from the projection of the edge on the optical axis to the intersection of the image side surface of the third lens and the optical axis, CT34 is the air separation distance between the third lens and the fourth lens on the optical axis. Satisfying the above relationship, through the reasonable layout of the optical structure, the direction change of the light entering the optical system can be slowed down, which helps to reduce the intensity of stray light, reduce the sensitivity of the optical system, and improve the production of the third lens. yield.

In an embodiment, the optical system satisfies the conditional formula: 0≤|SAG41|/CT34≤0.75; further, 0.238≤|SAG41|/CT34≤0.7; wherein, SAG41 is the effective area on the object side of the fourth lens The distance from the projection of the edge on the optical axis to the intersection of the object side of the lens and the optical axis, CT34 is the air separation distance between the third lens and the fourth lens on the optical axis. Satisfying the above relationship, through the reasonable layout of the optical structure, the direction change of the light entering the optical system can be slowed down, which helps to reduce the intensity of ghost images, reduce the sensitivity of the optical system, and improve the production of the fourth lens. yield.

In one embodiment, the optical system satisfies the conditional formula: 2≤TL/ImgH≤3; further, 2.143≤TL/ImgH≤2.471; wherein, ImgH is the image height corresponding to the maximum angle of view of the optical system half of . Satisfying the above-mentioned relational expression is beneficial to realize the lightness and thinness of the camera lens module.

In a second aspect, the present invention further provides a lens module including the optical system described in any one of the embodiments of the first aspect. By adding the optical system provided by the present invention to the lens module, the lens module has the characteristics of long focal length, high pixel and lightness.

In a third aspect, the present invention further provides an electronic device, the electronic device includes a housing and the lens module described in the second aspect, wherein the lens module is arranged in the housing. By adding the lens module provided by the present invention to the electronic device, the electronic device has the characteristics of high pixel, long focal length, and lightness and thinness.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

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

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

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

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

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

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

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

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

Fig. 5a is the structural schematic diagram of the optical system of the fifth embodiment;

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

6a is a schematic structural diagram of an optical system according to a sixth embodiment;

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

7a is a schematic structural diagram of an optical system according to a seventh embodiment;

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

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

An embodiment of the present invention provides a lens module. The lens module includes a lens barrel and the optical system provided by the embodiment of the present invention. The first lens to the sixth lens of the optical system are installed in the lens barrel. The lens module can be an independent lens of a digital camera, or an imaging module integrated on an electronic device such as an industrial barcode scanner. By adding the optical system provided by the present invention to the lens module, the lens module has the characteristics of high pixel, long focal length and lightness.

The embodiment of the present invention provides an electronic device, the electronic device includes a housing and the lens module provided by the embodiment of the present invention, and the lens module is arranged in the housing. Further, the electronic device may further include an electronic photosensitive element, the photosensitive surface of the electronic photosensitive element is located on the image plane of the optical system, and the light rays incident on the object on the photosensitive surface of the electronic photosensitive element through the first lens to the sixth lens can be converted into Image of electrical signals. The electronic photosensitive element may be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or a charge-coupled device (Charge-coupled Device, CCD). The electronic device can be an industrial barcode scanner, a smart phone, a personal digital assistant (PDA), a tablet computer, a smart watch, a drone, an e-book reader, a driving recorder, a wearable device, a monitor, a security camera device, Medical camera equipment, production and assembly of camera equipment, etc. By adding the lens module provided by the present invention to the electronic device, the electronic device not only has high pixels, but also has the characteristics of telephoto and thinning.

The optical system provided by the embodiment of the present invention sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along the optical axis direction. In the first to sixth lenses, any two adjacent lenses may have an air space between them.

Specifically, the specific shapes and structures of the six lenses are as follows: the first lens has a positive refractive power, and both the near-optical axis region and the near-circumferential region of the object side of the first lens are convex; the second to sixth lenses all have refractive power force; the optical system satisfies the conditional formula: 3≤(Y62*TL)/(ET6*f)≤10; further, 3.414≤(Y62*TL)/(ET6*f)≤8.4; wherein, Y62 is the sixth lens The maximum effective radius of the image side, TL is the axial distance from the object side of the first lens to the imaging surface of the optical system, ET6 is the thickness of the edge of the sixth lens in the direction of the optical axis, and f is the effective focal length of the optical system. Satisfying the above relationship can balance the telephoto characteristics of the optical system and the thickness of the optical imaging lens, and reduce the maximum diameter of the optical imaging lens while ensuring the imaging rate of the sixth lens.

The optical system also includes a diaphragm. The diaphragm can be arranged on the object side or the image side of the first lens to the sixth lens, and can also be arranged at any position between any two lenses. For example, the diaphragm is set in this embodiment. on the object side of the first lens.

An infrared cut-off filter can also be set between the sixth lens and the imaging surface, which is used to pass through the visible light band and cut off the infrared light band, so as to avoid the phenomenon of false color or ripple caused by the interference of light waves in the non-working band, and at the same time, it can improve the effective Resolution and color reproduction.

By setting up the six-piece lens structure, reasonably configuring the refractive power and surface shape of the six-piece optical lens, and making the optical system satisfy the above-mentioned relationship, while ensuring high imaging quality, the telephoto characteristic and lightness of the optical system can be achieved. change.

In one embodiment, the optical system satisfies: the object sides of the near-circumferential region of the third lens are all convex surfaces, the image sides of the near-circumferential regions of the third lens are all concave surfaces; the object sides of the near-circumferential regions of the fourth lens are all concave surfaces, the The image sides in the near-circumferential area of the four lenses are all convex; the object sides in the near-circumferential area of the fifth lens are concave, the image sides in the near-circumferential area of the fifth lens are convex; the object sides in the near-circumferential area of the sixth lens are concave , the image side surface of the sixth lens near the circumference area is convex. By reasonably configuring the surface shapes of the third lens to the sixth lens, it is beneficial to realize the telephoto characteristic of the optical system.

In one embodiment, the optical system satisfies the conditional formula: 1.5≤TL/EPD≤3; further, 1.905≤TL/EPD≤2.82; wherein, EPD is the entrance pupil diameter of the optical system. Satisfying the above relationship can make the overall length of the optical system smaller and increase the amount of incoming light.

In one embodiment, the optical system satisfies the conditional formula: 8(°/mm)≤(|AL1S1|+|AL2S1|)/f≤12(°/mm); further, 8.552(°/mm)≤(| AL1S1|+|AL2S1|)/f≤11.352(°/mm); wherein, there are tangent planes everywhere in the effective diameter of the object side of the first lens, and the tangent plane intersects with the plane perpendicular to the optical axis to form an acute angle, the The maximum value of the acute angle is AL1S1, and the second lens has tangent planes everywhere in the effective diameter of the object side surface, and the tangent plane intersects with the plane perpendicular to the optical axis to form an acute angle, and the maximum value of the acute angle is AL1S2 . Satisfying the above-mentioned relational expression makes it possible to reduce the production sensitivity of the first lens and realize the telephoto characteristic.

In one embodiment, the optical system satisfies the conditional formula: 5(1/mm)≤MVd/f≤10(1/mm); further, 6.057(1/mm)≤MVd/f≤9.052(1/mm) ; where MVd is the average of the Abbe numbers of the six lenses of the optical system. Satisfying the above relationship can balance the chromatic aberration, and the high Abbe number and the low Abbe number correspond to different refractive indices, and the telephoto characteristic and optical imaging performance can be achieved by the combination of different materials.

In one embodiment, the optical system satisfies the conditional formula: 0(1/mm)≤ET1/(CT1*f)≤0.5(1/mm); further, 0.041(1/mm)≤ET1/(CT1*f )≤0.098(1/mm); wherein, ET1 is the thickness of the edge of the first lens in the direction of the optical axis, and CT1 is the thickness of the center of the first lens in the direction of the optical axis. Satisfying the above-mentioned relational expression can facilitate the imaging of the first lens and realize the telephoto characteristic.

In one embodiment, the optical system satisfies the conditional formula: 0(1/mm)≤ET6/(CT6*f)≤0.5(1/mm); further, 0.045(1/mm)≤ET6/(CT6*f )≤0.152(1/mm); wherein, CT6 is the thickness of the center of the sixth lens in the direction of the optical axis. Satisfying the above-mentioned relational expression can facilitate the imaging of the sixth lens and realize the telephoto characteristic.

In one embodiment, the optical system satisfies the conditional formula: 0.3≤EPD/f≤0.6; further, 0.352≤EPD/f≤0.513; wherein, EPD is the entrance pupil diameter of the optical system. Satisfying the above relationship can balance the amount of light passing and the rearward movement of the imaging plane to achieve large aperture and telephoto characteristics.

In one embodiment, the optical system satisfies the conditional formula: 0≤|SAG32|/CT34≤0.35; further, 0.015≤|SAG32|/CT34≤0.333; wherein, SAG32 is the edge of the effective area on the image side of the third lens on the optical axis The distance from the projection on the third lens to the intersection of the image side surface and the optical axis of the third lens, CT34 is the air separation distance between the third lens and the fourth lens on the optical axis. Satisfying the above relationship, through a reasonable layout of the optical structure, the direction change of the light entering the optical system can be slowed down, which helps to reduce the intensity of stray light, reduce the sensitivity of the optical system, and improve the yield of the third lens.

In one embodiment, the optical system satisfies the conditional formula: 0≤|SAG41|/CT34≤0.75; further, 0.238≤|SAG41|/CT34≤0.7; wherein, SAG41 is the edge of the effective area on the object side of the fourth lens on the optical axis The distance from the projection on the fourth lens to the intersection of the object side of the fourth lens and the optical axis, CT34 is the air separation distance between the third lens and the fourth lens on the optical axis. Satisfying the above relational formula can reduce the direction change of light after entering the optical system through a reasonable layout of the optical structure, which helps to reduce the intensity of ghost images, reduce the sensitivity of the optical system, and improve the yield of the fourth lens.

In one embodiment, the optical system satisfies the conditional formula: 2≤TL/ImgH≤3; further, 2.143≤TL/ImgH≤2.471; wherein, ImgH is half of the image height corresponding to the maximum field angle of the optical system. Satisfying the above-mentioned relational expression is beneficial to realizing the lightness and thickness of the imaging lens group.

first embodiment

Please refer to FIG. 1a and FIG. 1b. The optical system of this embodiment includes sequentially from the object side to the image side along the optical axis direction:

The first lens L1 has a positive refractive power, the near-optical axis region and the near-circumferential region of the object side S1 of the first lens L1 are convex surfaces, and the image side S2 of the first lens L1 The near-optical axis region and the near-circumferential region are both concave surfaces ;

The second lens L2 has a positive refractive power, the near-optical axis area and the near-circumferential area of the object side S3 of the second lens L2 are convex surfaces, and the near-optical axis area and the near-circumferential area of the image side S4 of the second lens L2 are both convex;

The third lens L3 has a negative refractive power, the near-optical axis area and the near-circumferential area of the object side S5 of the third lens L3 are convex surfaces, and the near-optical axis area and the near-circumferential area of the image side S6 of the third lens L3 are both concave surfaces ;

The fourth lens L4 has a positive refractive power, the near-optical axis area and the near-circumferential area of the object side S7 of the fourth lens L4 are concave surfaces, and the near-optical axis area and the near-circumferential area of the image side S8 of the fourth lens L4 are both. convex;

The fifth lens L5 has negative refractive power, the object side S9 of the fifth lens L5 is concave in the near-optical axis area and the near-circumferential area, the image side S10 of the fifth lens L5 is concave in the near-optical axis area, and the near-circumferential area is convex. ;

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

The materials of the first lens L1 to the sixth lens L6 are all plastic, and all are aspherical. In addition, the optical system also includes a diaphragm ST0, an infrared cut filter IR, and an imaging plane IMG. The diaphragm STO is disposed on the object side of the first lens L1 for controlling the amount of incoming light. In other embodiments, the stop STO may also be disposed between two adjacent lenses, or on other lenses. The infrared cut filter IR is arranged on the image side of the sixth lens L6, which includes the object side S13 and the image side S14, and the infrared cut filter IR is used to filter out infrared light, so that the light entering the imaging surface IMG is visible light , the wavelength of visible light is 380nm-780nm. The material of the infrared cut filter IR is glass (GLASS), and can be coated on the glass. The effective pixel area of the electronic photosensitive element is located on the imaging plane IMG.

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

Table 1a

Among them, f is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the maximum field of view of the optical system.

In this embodiment, the object side surface and the image side surface of the first lens L1 to the sixth lens L6 are all aspherical surfaces, and the surface type x of each aspherical lens can be limited by but not limited to the following aspherical surface formulas:

Among them, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the above table The reciprocal of the Y radius R in 1a); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 1b gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspheric mirror surfaces S3-S12 in the first embodiment.

Table 1b

FIG. 1b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the first embodiment. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatic curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curve represents the magnitude of distortion corresponding to different field angles . It can be seen from FIG. 1b that the optical system provided in the first embodiment can achieve good imaging quality.

Second Embodiment

Please refer to FIG. 2a and FIG. 2b. The optical system of this embodiment includes sequentially from the object side to the image side along the optical axis direction:

The first lens L1 has a positive refractive power, the near-optical axis region and the near-circumferential region of the object side S1 of the first lens L1 are convex surfaces, and the image side S2 of the first lens L1 The near-optical axis region and the near-circumferential region are both concave surfaces ;

The second lens L2 has a positive refractive power, the near-optical axis region and the near-circumferential region of the object side S3 of the second lens L2 are convex surfaces, the near-optical axis region of the image side S4 of the second lens L2 is convex, and the near-circumferential region is concave;

The third lens L3 has a negative refractive power, and the object side S5 of the third lens L3 near the optical axis area and the near circumference area are convex surfaces, and the image side S6 near the optical axis area and the near circumference area of the third lens L3 are both concave surfaces;

The 4th lens L4 has negative refractive power, and the object side S7 of the 4th lens L4 near the optical axis area and the near-circumferential area are both concave surfaces, and the image side S8 of the fourth lens L4 The near-optical axis area and the near-circumferential area are convex surfaces;

The fifth lens L5 has negative refractive power, the object side S9 of the fifth lens L5 is a convex surface near the optical axis, and the near-circumferential area is a concave surface, and the image side S10 of the fifth lens L5 is a concave near-optical axis area, and the near-circumferential area is a concave surface. convex;

The sixth lens L6 has a positive refractive power, the object side surface S11 of the sixth lens L6 is a convex surface near the optical axis, and the near circumference area is a concave surface, and the image side S12 of the sixth lens L6 is a concave surface near the optical axis area, and the near circumference area is concave. is convex.

Other structures of the second embodiment are the same as those of the first embodiment, which can be referred to.

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

Table 2a

Wherein, the meanings of the parameters in Table 2a are the same as the meanings of the parameters in the first embodiment.

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

Table 2b

Fig. 2b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system; astigmatism The curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curve represents the magnitude of the distortion corresponding to different field angles. It can be seen from FIG. 2b that the optical system provided in the second embodiment can achieve good imaging quality.

Third Embodiment

Please refer to FIG. 3a and FIG. 3b. The optical system of this embodiment includes sequentially from the object side to the image side along the optical axis direction:

The first lens L1 has a positive refractive power, the object side S1 of the first lens L1 near the optical axis area and the near circumference area are convex surfaces, and the image side S2 of the first lens L1 The near optical axis area and the near circumference area are both concave surfaces;

The second lens L2 has a positive refractive power, the object side S3 of the second lens L2 is convex in the near-optical axis area and the near-circumferential area, the image-side S4 of the second lens L2 is concave in the near-optical axis area, and the near-circumferential area is convex. ;

The third lens L3 has a negative refractive power, the object side S5 of the third lens L3 is concave in the near-optical axis area, the near-circumferential area is convex, the image side S6 of the third lens L3 is convex in the near-optical axis area, and the near-circumferential area is concave;

The 4th lens L4 has negative refractive power, and the object side S7 of the 4th lens L4 near the optical axis area and the near-circumferential area are both concave surfaces, and the image side S8 of the fourth lens L4 The near-optical axis area and the near-circumferential area are convex surfaces;

The fifth lens L5 has negative refractive power, and the object side S9 of the fifth lens L5 near the optical axis area and the near circumference area are both concave surfaces, and the image side S10 near the optical axis area and the near circumference area of the fifth lens L5 are convex surfaces;

The sixth lens L6 has a negative refractive power, the object side S11 of the sixth lens L6 is concave in the near-optical axis region and the near-circumferential region, and the image side S12 of the sixth lens L6 is convex in the near-optical axis and near-circumferential regions.

Other structures of the third embodiment are the same as those of the first embodiment, which can be referred to.

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

Table 3a

Wherein, the meanings of the parameters in Table 3a are the same as the meanings of the parameters in the first embodiment.

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

Table 3b

Fig. 3b shows longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the third embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system; astigmatism The curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curve represents the magnitude of the distortion corresponding to different field angles. According to Fig. 3b, it can be seen that the optical system provided in the third embodiment can achieve good imaging quality.

Fourth Embodiment

Referring to FIG. 4a and FIG. 4b, the optical system of the present embodiment includes sequentially from the object side to the image side along the optical axis direction:

The first lens L1 has a positive refractive power, the object side S1 of the first lens L1 near the optical axis area and the near circumference area are convex surfaces, and the image side S2 of the first lens L1 The near optical axis area and the near circumference area are both concave surfaces;

The second lens L2 has positive refractive power, and the object side S3 of the second lens L2 near the optical axis area and the near circumference area are convex surfaces, and the image side S4 near the optical axis area and the near circumference area of the second lens L2 are concave surfaces;

The third lens L3 has a negative refractive power, the object side S5 of the third lens L3 has a concave near-optical axis area, and the near-circumferential area is convex, and the image side S6 of the third lens L3 has a near-optical axis area and a near-circumferential area. concave;

The fourth lens L4 has negative refractive power, the object side S7 of the fourth lens L4 is a convex surface near the optical axis, and the near-circumferential area is a concave surface, and the image side S8 of the fourth lens L4 is a concave near-optical axis area, and the near-circumferential area is a concave surface. convex;

The fifth lens L5 has negative refractive power, and the object side S9 of the fifth lens L5 near the optical axis area and the near circumference area are both concave surfaces, and the image side S10 near the optical axis area and the near circumference area of the fifth lens L5 are convex surfaces;

The sixth lens L6 has a negative refractive power, the object side surface S11 of the sixth lens L6 is a convex surface near the optical axis, and the near circumference area is a concave surface, and the image side S12 of the sixth lens L6 is a concave surface near the optical axis area, and the near circumference area is Convex.

Other structures of the fourth embodiment are the same as those of the first embodiment, which can be referred to.

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

Table 4a

Wherein, the meanings of the parameters in Table 4a are the same as the meanings of the parameters in the first embodiment.

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

Table 4b

Fig. 4b shows longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fourth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system; astigmatism The curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curve represents the magnitude of the distortion corresponding to different field angles. It can be seen from FIG. 4b that the optical system provided in the fourth embodiment can achieve good imaging quality.

Fifth Embodiment

Please refer to FIG. 5a and FIG. 5b , the optical system of this embodiment includes sequentially from the object side to the image side along the optical axis direction:

The first lens L1 has a positive refractive power, the object side S1 of the first lens L1 near the optical axis area and the near circumference area are convex surfaces, and the image side S2 of the first lens L1 The near optical axis area and the near circumference area are convex surfaces;

The second lens L2 has negative refractive power, the object side S3 of the second lens L2 is concave in the near-optical axis area and the near-circumferential area, the image side S4 of the second lens L2 is concave in the near-optical axis area, and the near-circumferential area is convex. ;

The third lens L3 has a negative refractive power, the object side surface S5 of the third lens L3 is concave in the near-optical axis area, the near-circumferential area is convex, and the image side S6 of the third lens L3 The near-optical axis area and the near-circumferential area are concave surfaces ;

The fourth lens L4 has a positive refractive power, the object side S7 of the fourth lens L4 is a convex surface near the optical axis, and the near-circumferential area is a concave surface, and the image side S8 of the fourth lens L4 is a concave near the optical axis area, and the near-circumferential area is a concave surface. convex;

The fifth lens L5 has negative refractive power, the object side S9 of the fifth lens L5 is a convex surface near the optical axis, and the near-circumferential area is a concave surface, and the image side S10 of the fifth lens L5 is a concave near-optical axis area, and the near-circumferential area is a concave surface. convex;

The sixth lens L6 has a positive refractive power, the object side surface S11 of the sixth lens L6 is a convex surface near the optical axis, and the near-circumferential region is a concave surface, and the image side S12 of the sixth lens L6 is a concave surface near the optical axis, and the near-circumferential region is a concave surface. Convex.

The other structures of the fifth embodiment are the same as those of the first embodiment, which can be referred to.

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

Table 5a

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

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

Table 5b

Fig. 5b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fifth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system; astigmatism The curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curve represents the magnitude of the distortion corresponding to different field angles. According to Fig. 5b, it can be seen that the optical system provided in the fifth embodiment can achieve good imaging quality.

Sixth Embodiment

Please refer to FIG. 6a and FIG. 6b. The optical system of this embodiment, from the object side to the image side along the optical axis direction, sequentially includes:

The first lens L1 has a positive refractive power, the object side S1 of the first lens L1 near the optical axis area and the near circumference area are convex surfaces, and the image side S2 of the first lens L1 The near optical axis area and the near circumference area are both concave surfaces;

The second lens L2 has positive refractive power, and the object side S3 of the second lens L2 near the optical axis area and the near circumference area are convex surfaces, and the image side S4 near the optical axis area and the near circumference area of the second lens L2 are concave surfaces;

The third lens L3 has a negative refractive power, and the object side S5 of the third lens L3 near the optical axis area and the near circumference area are convex surfaces, and the image side S6 near the optical axis area and the near circumference area of the third lens L3 are both concave surfaces;

The fourth lens L4 has a positive refractive power, and the object side S7 of the fourth lens L4 near the optical axis area and the near circumference area are both concave surfaces, and the image side S8 near the optical axis area and the near circumference area of the fourth lens L4 are convex surfaces;

The fifth lens L5 has a positive refractive power, and the object side S9 of the fifth lens L5 near the optical axis area and the near circumference area are both concave surfaces, and the image side S10 near the optical axis area and the near circumference area of the fifth lens L5 are convex surfaces;

The sixth lens L6 has a negative refractive power, the object side surface S11 of the sixth lens L6 is concave in the near-optical axis area and the near-circumferential area, the image side S12 of the sixth lens L6 is concave in the near-optical axis area, and the near-circumferential area is convex. .

The other structures of the sixth embodiment are the same as those of the first embodiment, which can be referred to.

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

Table 6a

Wherein, the meanings of the parameters in Table 6a are the same as the meanings of the parameters in the first embodiment.

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

Table 6b

Fig. 6b shows longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the converging point of light of different wavelengths after passing through each lens of the optical system; astigmatism The curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curve represents the magnitude of the distortion corresponding to different field angles. It can be seen from FIG. 6b that the optical system provided in the sixth embodiment can achieve good imaging quality.

Seventh Embodiment

Please refer to Fig. 7a and Fig. 7b, the optical system of this embodiment, the object side along the optical axis direction to the image side sequentially includes:

The first lens L1 has a positive refractive power, the near-optical axis region and the near-circumferential region of the object side S1 of the first lens L1 are convex surfaces, the image side S2 of the first lens L1 is concave in the near-optical axis region, and the near-circumferential region is convex. ;

The second lens L2 has negative refractive power, the object side S3 of the second lens L2 is convex in the near-optical axis area and the near-circumferential area, the image-side S4 of the second lens L2 is concave in the near-optical axis area, and the near-circumferential area is convex. ;

The third lens L3 has a positive refractive power, and the object side S5 of the third lens L3 near the optical axis area and the near circumference area are convex surfaces, and the image side S6 near the optical axis area and the near circumference area of the third lens L3 are both concave surfaces;

The 4th lens L4 has negative refractive power, and the object side S7 of the 4th lens L4 near the optical axis area and the near-circumferential area are both concave surfaces, and the image side S8 of the fourth lens L4 The near-optical axis area and the near-circumferential area are convex surfaces;

The fifth lens L5 has negative refractive power, the object side S9 of the fifth lens L5 is concave in the near-optical axis area and the near-circumferential area, the image side S10 of the fifth lens L5 is concave in the near-optical axis area, and the near-circumferential area is convex. ;

The sixth lens L6 has a positive refractive power, the object side S11 of the sixth lens L6 is concave in the near-optical axis area and the near-circumferential area, and the image side S12 of the sixth lens L6 is convex in the near-optical axis area and the near-circumferential area.

The other structures of the seventh embodiment are the same as those of the first embodiment, which can be referred to.

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

Table 7a

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

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

Table 7b

	Fc/Fd	FOVc/ImgH	D2c/D2d	et12/ct12
first embodiment	2.29	3.85	9.78	4.21
Second Embodiment	2.22	3.81	6.98	3.95
Third Embodiment	2.40	3.82	13.59	7.11
Fourth Embodiment	2.20	3.75	13.49	4.88
Fifth Embodiment	2.24	3.70	5.91	2.84
Sixth Embodiment	2.27	3.46	11.87	4.90
	fg3/g3	Fc/(f3+fjh2)	|R71|/R82	f8/ct8
first embodiment	4.21	1.09	1.52	8.14
Second Embodiment	5.87	1.09	2.01	48.87
Third Embodiment	4.09	1.10	1.76	7.51
Fourth Embodiment	6.64	1.15	5.05	24.43
Fifth Embodiment	5.10	1.16	1.86	5.19
Sixth Embodiment	7.01	1.25	1.34	11.61

Fig. 7b shows longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the seventh embodiment, wherein the longitudinal spherical aberration curve represents the deviation of the focusing point of light of different wavelengths after passing through each lens of the optical system; astigmatism The curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curve represents the magnitude of the distortion corresponding to different field angles. It can be seen from FIG. 7b that the optical system provided in the seventh embodiment can achieve good imaging quality.

Table 8 shows (Y62*TL)/(ET6*f), TL/EPD, (|AL1S1|+|AL2S1|)/f, MVd/f, Values of ET1/(CT1*f), ET6/(CT6*f), EPD/f, |SAG32|/CT34, |SAG41|/CT34 and TL/ImgH.

Table 8

What is disclosed above is only a preferred embodiment of the present application, and of course, it cannot limit the scope of the right of the present application. Those of ordinary skill in the art can understand all or part of the process of implementing the above-mentioned embodiment, and the right to The equivalent changes required to be made still fall within the scope covered by this application.

Claims (13)

1. An optical system, characterized in that, from the object side to the image side along the optical axis direction, it comprises:

   The first lens has a positive refractive power, and both the near-optical axis region and the near-circumferential region on the object side of the first lens are convex surfaces;

   The second lens has refractive power;

   The third lens has refractive power;

   the fourth lens, with refractive power;

   the fifth lens, with refractive power;

   The sixth lens has refractive power;

   The optical system satisfies the conditional formula: 3≤(Y62*TL)/(ET6*f)≤10; wherein, Y62 is the maximum optical effective radius of the image side of the sixth lens, and TL is the object of the first lens The axial distance from the side surface to the imaging surface of the optical system, ET6 is the thickness of the edge of the sixth lens in the direction of the optical axis, and f is the effective focal length of the optical system.
2. The optical system of claim 1, wherein the optical system satisfies:

   The object sides of the near-circumferential region of the third lens are all convex surfaces, and the image sides of the near-circumferential regions of the third lens are all concave surfaces;

   The object sides of the near-circumferential region of the fourth lens are all concave surfaces, and the image sides of the near-circumferential regions of the fourth lens are all convex surfaces;

   The object side surfaces of the near-circumferential region of the fifth lens are all concave surfaces, and the image sides of the near-circumferential regions of the fifth lens are all convex surfaces;

   The object side surface of the near-circumferential region of the sixth lens is concave, and the image side of the near-circumferential region of the sixth lens is convex.
3. The optical system according to claim 1 or 2, wherein the optical system satisfies the conditional expression:

   1.5≤TL/EPD≤3;

   Wherein, EPD is the entrance pupil diameter of the optical system.
4. The optical system according to claim 1 or 2, wherein the optical system satisfies the conditional expression:

   8(°/mm)≤(|AL1S1|+|AL2S1|)/f≤12(°/mm);

   Wherein, there are tangent planes everywhere in the effective diameter of the object side of the first lens, and 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, and the second lens object There are tangent planes everywhere in the effective radius of the side surface, and 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 AL1S2.
5. The optical system according to claim 1 or 2, wherein the optical system satisfies the conditional expression:

   5(1/mm)≤MVd/f≤10(1/mm);

   Wherein, MVd is the average value of Abbe numbers of the six lenses of the optical system.
6. The optical system according to claim 1 or 2, wherein the optical system satisfies the conditional expression:

   0(1/mm)≤ET1/(CT1*f)≤0.5(1/mm);

   Wherein, ET1 is the thickness of the edge of the first lens in the direction of the optical axis, and CT1 is the thickness of the center of the first lens in the direction of the optical axis.
7. The optical system according to claim 1 or 2, wherein the optical system satisfies the conditional expression:

   0(1/mm)≤ET6/(CT6*f)≤0.5(1/mm);

   Wherein, CT6 is the thickness of the center of the sixth lens in the direction of the optical axis.
8. The optical system according to claim 1 or 2, wherein the optical system satisfies the conditional expression:

   0.3≤EPD/f≤0.6;

   Wherein, EPD is the entrance pupil diameter of the optical system.
9. The optical system according to claim 1 or 2, wherein the optical system satisfies the conditional expression:

   0≤|SAG32|/CT34≤0.35;

   Wherein, SAG32 is the distance from the projection of the edge of the effective area of the image side of the third lens on the optical axis to the intersection of the image side of the third lens and the optical axis, and CT34 is the optical axis of the third lens and the fourth lens. Air separation distance on the shaft.
10. The optical system according to claim 1 or 2, wherein the optical system satisfies the conditional expression:

    0≤|SAG41|/CT34≤0.75;

    Wherein, SAG41 is the distance from the projection of the edge of the effective area of the object side of the fourth lens on the optical axis to the intersection of the object side of the fourth lens and the optical axis, and CT34 is the optical axis of the third lens and the fourth lens. Air separation distance on the shaft.
11. The optical system according to claim 1 or 2, wherein the optical system satisfies the conditional expression:

    2≤TL/ImgH≤3;

    Wherein, ImgH is half of the image height corresponding to the maximum angle of view of the optical system.
12. A lens module, characterized in that it comprises an electronic photosensitive element and the optical system according to any one of claims 1 to 11, wherein the electronic photosensitive element is arranged on an imaging surface of the optical system.
13. An electronic device, characterized in that, the electronic device comprises a casing and the lens module according to claim 12 , and the lens module is arranged in the casing.

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