A camera system

Abstract

The present invention discloses an imaging system, which sequentially includes, from the object side to the image side along the optical axis: a first lens with a positive optical power, whose image side is convex; a second lens with a negative optical power, whose image side is concave; a third lens with a positive optical power; wherein, the distance TS3 from the aperture stop of the imaging system to the image side of the third lens on the optical axis and the distance TTL from the object side of the first lens of the imaging system to the imaging surface on the optical axis satisfy: 0.2 < TS3 / TTL < 0.3. By controlling the axial distance from the object side of the first lens to the imaging surface and the distance from the aperture stop of the imaging system to the image side of the third lens on the optical axis, the ultra-thin characteristic of the lens is ensured, the miniaturization of the lens is realized, the space utilization rate of the whole machine is improved, the lens protrusion phenomenon is reduced, and the aesthetics of the whole machine is ensured.

Description

Technical Field

[0001] The invention belongs to the field of optical imaging, and in particular relates to a camera system comprising three lenses. Background Art

[0002] In recent years, consumers have higher and higher requirements for mobile phone camera functions, and demands for functions such as face recognition and ranging have emerged. However, due to the complexity of the shooting environment, it is difficult to obtain clear images in dim environments. Current mobile phone lenses are limited in imaging in insufficiently lit environments and cannot achieve extremely clear imaging effects. At this time, infrared lenses can solve this problem very well.

[0003] Infrared lenses can enhance the amount of light entering the entire imaging system by collecting infrared light in the shooting environment. Compared with the multiple shooting algorithm synthesis of the previous mobile phone lens night scene mode, the image resolution obtained by the infrared lens does not decrease, which is another simpler and more effective solution. And because different price models all need this function, low-cost solutions that meet performance requirements are more competitive

[0004] Therefore, this solution provides an optical imaging lens group with the characteristics of infrared, large aperture, and low cost, which can effectively improve the imaging quality, meet the shooting requirements in dim environments, and better control costs. Summary of the invention

[0005] The present invention aims to provide a small-volume camera system with high imaging quality and small system volume. It has the characteristics of infrared, large aperture, and low cost, can effectively improve the imaging quality, meet the shooting requirements in dim environments, and better control costs.

[0006] The present application provides a camera system, which includes, in order from the object side to the image side along the optical axis:

[0007] A first lens having positive refractive power, whose image side surface is convex;

[0008] A second lens having negative optical power, whose image side surface is concave;

[0009] a third lens having positive refractive power;

[0010] The distance TS3 from the aperture of the camera system to the image side of the third lens on the optical axis and the distance TTL from the object side of the first lens of the camera system to the imaging surface on the optical axis satisfy: 0.2 <TS3 / TTL<0.3。

[0011] According to one embodiment of the present application, the f-number Fno of the camera system satisfies: Fno<1.23.

[0012] According to one embodiment of the present application, the curvature radius R4 of the image side surface of the second lens and the entrance pupil diameter EPD of the camera system satisfy: 0.4 <R4 / EPD<0.8。

[0013] According to one embodiment of the present application, the curvature radius R2 of the image side surface of the first lens and the effective focal length f2 of the second lens satisfy: 0.1 <R2 / f2<0.4。

[0014] According to one embodiment of the present application, the edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 0.7 <ET1 / CT1<1.2。

[0015] According to one embodiment of the present application, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.6 <f1 / f3。

[0016] According to one embodiment of the present application, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens and the dispersion coefficient V3 of the third lens satisfy: 3×(CT1+CT2+CT3) / (V1+V2-V3)<0.1mm.

[0017] According to one embodiment of the present application, the on-axis distance Sag11 between the intersection of the first lens object side and the optical axis to the effective radius vertex of the first lens object side and the maximum effective radius Dt11 of the first lens object side satisfy: Sag11 / Dt11<-0.1.

[0018] According to one embodiment of the present application, the on-axis distance Sag22 between the intersection of the second lens image side surface and the optical axis to the effective radius vertex of the second lens image side surface and the maximum effective radius Dt22 of the second lens image side surface satisfy: 0.1 <Sag22 / Dt22。

[0019] According to one embodiment of the present application, the on-axis distance Sag31 between the intersection of the third lens object side and the optical axis to the effective radius vertex of the third lens object side and the maximum effective radius Dt31 of the third lens object side satisfy: |Sag31| / Dt31<0.1.

[0020] A camera system, comprising, in order from the object side to the image side along the optical axis:

[0021] a first lens having positive optical power;

[0022] a second lens having negative optical power;

[0023] a third lens having positive refractive power;

[0024] The distance TS3 from the aperture of the camera system to the image side of the third lens on the optical axis and the distance TTL from the object side of the first lens of the camera system to the imaging surface on the optical axis satisfy: 0.2 <TS3 / TTL<0.3。

[0025] According to one embodiment of the present application, the f-number Fno of the camera system satisfies: Fno<1.23.

[0026] According to one embodiment of the present application, the curvature radius R4 of the image side surface of the second lens and the entrance pupil diameter EPD of the camera system satisfy: 0.4 <R4 / EPD<0.8。

[0027] According to one embodiment of the present application, the curvature radius R2 of the image side surface of the first lens and the effective focal length f2 of the second lens satisfy: 0.1 <R2 / f2<0.4。

[0028] According to one embodiment of the present application, the edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 0.7 <ET1 / CT1<1.2。

[0029] According to one embodiment of the present application, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.6 <f1 / f3。

[0030] According to one embodiment of the present application, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens and the dispersion coefficient V3 of the third lens satisfy: 3×(CT1+CT2+CT3) / (V1+V2-V3)<0.1mm.

[0031] According to one embodiment of the present application, the on-axis distance Sag11 between the intersection of the first lens object side and the optical axis to the effective radius vertex of the first lens object side and the maximum effective radius Dt11 of the first lens object side satisfy: Sag11 / Dt11<-0.1.

[0032] According to one embodiment of the present application, the on-axis distance Sag22 between the intersection of the second lens image side surface and the optical axis to the effective radius vertex of the second lens image side surface and the maximum effective radius Dt22 of the second lens image side surface satisfy: 0.1 <Sag22 / Dt22。

[0033] According to one embodiment of the present application, the on-axis distance Sag31 between the intersection of the third lens object side and the optical axis to the effective radius vertex of the third lens object side and the maximum effective radius Dt31 of the third lens object side satisfy: |Sag31| / Dt31<0.1.

[0034] Beneficial effects of the present invention:

[0035] The camera system provided by the present invention includes multiple lenses, such as the first lens to the third lens. By controlling the on-axis distance from the object side of the first lens to the imaging surface and the distance from the aperture of the camera system to the image side of the third lens on the optical axis, the ultra-thin characteristics of the lens are ensured, the miniaturization of the lens is achieved, the space utilization rate of the whole machine is improved, the lens bulge phenomenon is reduced, and the beauty of the whole machine is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 Schematic diagram of the lens group structure of the camera system embodiment 1 of the present invention;

[0038] Figure 2a to Figure 2c They are respectively a distortion curve, an axial chromatic aberration curve and an astigmatism curve of the camera system embodiment 1 of the present invention;

[0039] Figure 3 Schematic diagram of the lens group structure of the camera system embodiment 2 of the present invention;

[0040] Figures 4a to 4c They are respectively a distortion curve, an axial chromatic aberration curve and an astigmatism curve of the camera system embodiment 2 of the present invention;

[0041] Figure 5 Schematic diagram of the lens group structure of the camera system embodiment 3 of the present invention;

[0042] Figures 6a to 6c They are respectively a distortion curve, an axial chromatic aberration curve and an astigmatism curve of the camera system embodiment 3 of the present invention;

[0043] Figure 7 Schematic diagram of the lens group structure of the camera system embodiment 4 of the present invention;

[0044] Figures 8a to 8c They are respectively the distortion curve, the axial chromatic aberration curve and the astigmatism curve of the camera system embodiment 4 of the present invention. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0047] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0048] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0049] In the description of the present invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0050] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0051] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] Exemplary Embodiment

[0053] The imaging system according to an exemplary embodiment of the present invention includes three lenses, which sequentially include, from the object side to the image side along the optical axis: a first lens, a second lens, and a third lens, wherein each lens is independent of each other.

[0054] In this exemplary embodiment, it sequentially includes, from the object side to the image side along the optical axis: a first lens with a positive focal power; a second lens with a negative focal power; a third lens with a positive focal power; wherein, the distance TS3 from the aperture stop of the imaging system to the image side surface of the third lens on the optical axis and the distance TTL from the object side surface of the first lens of the imaging system to the imaging surface on the optical axis satisfy: 0.2 < TS3 / TTL < 0.3. By controlling the axial distance from the object side surface of the first lens to the imaging surface and the distance from the aperture stop of the imaging system to the image side surface of the third lens on the optical axis, the ultra-thin characteristic of the lens is ensured, the miniaturization of the lens is realized, the space utilization rate of the whole machine is improved, the lens bulging phenomenon is reduced, and the aesthetics of the whole machine is ensured.

[0055] More specifically, it sequentially includes, from the object side to the image side along the optical axis: a first lens with a positive focal power, the image side surface of which is convex; a second lens with a negative focal power, the image side surface of which is concave; a third lens with a positive focal power; wherein, the distance TS3 from the aperture stop of the imaging system to the image side surface of the third lens on the optical axis and the distance TTL from the object side surface of the first lens of the imaging system to the imaging surface on the optical axis satisfy: 0.2 < TS3 / TTL < 0.3. By controlling the axial distance from the object side surface of the first lens to the imaging surface and the distance from the aperture stop of the imaging system to the image side surface of the third lens on the optical axis, the ultra-thin characteristic of the lens is ensured, the miniaturization of the lens is realized, the space utilization rate of the whole machine is improved, the lens bulging phenomenon is reduced, and the aesthetics of the whole machine is ensured. More specifically, the distance TS3 from the aperture stop of the imaging system to the image side surface of the third lens on the optical axis and the distance TTL from the object side surface of the first lens of the imaging system to the imaging surface on the optical axis satisfy: 0.20 < TS3 / TTL < 0.28.

[0056] In this exemplary embodiment, the f-number Fno of the imaging system satisfies: Fno < 1.23. A large aperture is beneficial to improving the light passing aperture of the imaging system, allowing more light to enter the image plane, and is beneficial to improving the shooting effect under dark night conditions. More specifically, the f-number Fno of the imaging system satisfies: Fno < 1.22.

[0057] In this exemplary embodiment, the radius of curvature R4 of the image-side surface of the second lens and the entrance pupil diameter EPD of the imaging system satisfy: 0.4 < R4 / EPD < 0.8. By controlling the radius of curvature of the image-side surface of the second lens and the entrance pupil diameter of the imaging system, it is beneficial to control the shape of the second lens to meet the processability. At the same time, the large aperture is beneficial to increasing the light-passing aperture of the imaging system, allowing more light to enter the image plane, which is beneficial to improving the shooting effect under dark-night conditions. More specifically, the radius of curvature R4 of the image-side surface of the second lens and the entrance pupil diameter EPD of the imaging system satisfy: 0.41 < R4 / EPD < 0.75.

[0058] In this exemplary embodiment, the radius of curvature R2 of the image-side surface of the first lens and the effective focal length f2 of the second lens satisfy: 0.1 < R2 / f2 < 0.4. By controlling the effective focal length of the second lens and the radius of curvature of the image-side surface of the first lens, it is beneficial to control the shape of the object-side surface of the negative lens to meet the processability requirements. More specifically, the radius of curvature R2 of the image-side surface of the first lens and the effective focal length f2 of the second lens satisfy: 0.13 < R2 / f2 < 0.38.

[0059] In this exemplary embodiment, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 0.7 < ET1 / CT1 < 1.2. By controlling the edge thickness of the first lens and the central thickness of the first lens on the optical axis, it is beneficial to control the shape of the object-side surface of the negative lens to meet the processability requirements. More specifically, the edge thickness ET1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy: 0.75 < ET1 / CT1 < 1.15.

[0060] In this exemplary embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.6 < f1 / f3. This is beneficial to the reasonable distribution of the optical powers of the first lens and the third lens in space and is beneficial to reducing the aberration of the lens. More specifically, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.61 < f1 / f3.

[0061] In the present exemplary embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, and the dispersion coefficient V3 of the third lens satisfy: 3×(CT1 + CT2 + CT3) / (V1 + V2 - V3) < 0.1 mm. By controlling the central thicknesses of the first, second, and third lenses on the optical axis and the dispersion coefficients of the first, second, and third lenses, the aberration of the lens can be effectively reduced. More specifically, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, and the dispersion coefficient V3 of the third lens satisfy: 3×(CT1 + CT2 + CT3) / (V1 + V2 - V3) < 0.09 mm.

[0062] In the present exemplary embodiment, the axial distance Sag11 between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens and the maximum effective radius Dt11 of the object side surface of the first lens satisfy: Sag11 / Dt11 < -0.1. By controlling the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens and the maximum effective radius of the object side surface of the first lens, it is beneficial to control the shape of the object side surface of the first lens and ensure processability. More specifically, the axial distance Sag11 between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens and the maximum effective radius Dt11 of the object side surface of the first lens satisfy: Sag11 / Dt11 ≤ -0.11.

[0063] In the present exemplary embodiment, the axial distance Sag22 between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens and the maximum effective radius Dt22 of the image side surface of the second lens satisfy: 0.1 < Sag22 / Dt22. By controlling the axial distance between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens and the maximum effective radius of the image side surface of the second lens, it is beneficial to control the shape of the image side surface of the second lens and ensure processability. More specifically, the axial distance Sag22 between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens and the maximum effective radius Dt22 of the image side surface of the second lens satisfy: 0.15 < Sag22 / Dt22.

[0064] In this exemplary embodiment, the on-axis distance Sag31 between the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens and the maximum effective radius Dt31 of the object side surface of the third lens satisfy: |Sag31| / Dt31<0.1. By controlling the on-axis distance between the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens and the maximum effective radius of the object side surface of the third lens, it is beneficial to control the shape of the object side surface of the third lens and ensure processability. More specifically, the on-axis distance Sag31 between the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens and the maximum effective radius Dt31 of the object side surface of the third lens satisfy: |Sag31| / Dt31<0.08.

[0065] In this exemplary embodiment, the object side surface and the image side surface of any lens of the first lens E1 to the third lens E3 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0066]

[0067] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1); k is the cone coefficient; Ai is the correction coefficient of the i-th order aspheric surface.

[0068] In this exemplary embodiment, the camera system may further include an aperture. The aperture may be disposed at an appropriate position as required, for example, the aperture may be disposed between the first lens and the second lens. Optionally, the camera system may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0069] The camera system according to the above embodiment of the present invention can use multiple lenses, such as the above three lenses. By reasonably allocating the focal length, surface shape, center thickness of each lens, and the on-axis spacing between each lens, the camera system has a larger imaging surface, a wide imaging range, and high imaging quality, and ensures that the camera system is miniaturized.

[0070] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the third lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens in the first lens, the second lens and the third lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens in the first lens, the second lens and the third lens are all aspherical mirror surfaces.

[0071] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the camera system can be changed to obtain the various results and advantages described in this specification. For example, although three lenses are used as an example in the embodiment, the camera system is not limited to including three lenses, and the camera system may also include other numbers of lenses if necessary.

[0072] Specific embodiments of the camera system applicable to the above embodiments will be further described below with reference to the accompanying drawings. Specific embodiment 1

[0074] Figure 1 Schematic diagram of the lens group structure of the camera system embodiment 1 of the present invention. The camera system includes, from the object side to the image side along the optical axis, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a filter E4 and an imaging surface S9.

[0075] The first lens E1 has positive power, its object side surface S1 is concave, and its image side surface S2 is convex. The second lens E2 has negative power, its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is convex. The filter E4 has an object side surface S7 and an image side surface S8. The light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0076] As shown in Table 1, it is a basic parameter table of the camera system of Example 1, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0077]

[0078] Table 1

[0079] As shown in Table 2, in Example 1, the total effective focal length f of the camera system is 1.33 mm, and half of the diagonal length of the effective pixel area on the imaging plane of the camera system is ImgH=1.18 mm. Half of the maximum field of view of the camera system is Semi-FOV=41.59°. The aperture value Fno of the camera system is 1.21.

[0080]

[0081] Table 2

[0082] The camera system in Embodiment 1 satisfies:

[0083] TS3 / TTL=0.24; wherein TS3 is the distance from the aperture of the camera system to the image side surface of the third lens on the optical axis, and TTL is the distance from the object side surface of the first lens of the camera system to the imaging surface on the optical axis.

[0084] R4 / EPD=0.73; wherein R4 is the radius of curvature of the image side surface of the second lens, and EPD is the entrance pupil diameter of the camera system.

[0085] R2 / f2=0.31; wherein R2 is the radius of curvature of the image side of the first lens, and f2 is the effective focal length of the second lens.

[0086] ET1 / CT1=1.10; wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.

[0087] f1 / f3=0.67; wherein f1 is the effective focal length of the first lens, and f3 is the effective focal length of the third lens.

[0088] 3×(CT1+CT2+CT3) / (V1+V2-V3)=0.07; wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, V1 is the dispersion coefficient of the first lens, V2 is the dispersion coefficient of the second lens, and V3 is the dispersion coefficient of the third lens.

[0089] Sag11 / Dt11=-0.16; wherein Sag11 is the on-axis distance between the intersection of the first lens object side and the optical axis to the effective radius vertex of the first lens object side, and Dt11 is the maximum effective radius of the first lens object side.

[0090] Sag22 / Dt22=0.17; wherein Sag22 is the on-axis distance between the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens, and Dt22 is the maximum effective radius of the image side surface of the second lens.

[0091] |Sag31| / Dt31=0.03; wherein Sag31 is the on-axis distance between the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens, and Dt31 is the maximum effective radius of the object side surface of the third lens.

[0092] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the third lens E3 are aspherical surfaces. Table 3 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0093] Face number A4 A6 A8 A10 A12 A14 A16 S1 8.2194E-03 3.2413E+00 -1.9121E+01 5.5193E+01 -1.6450E+01 -4.2005E+02 1.5918E+03 S2 1.3491E+01 -2.1209E+02 2.6142E+03 -2.3016E+04 1.4443E+05 -6.5280E+05 2.1476E+06 S3 2.4062E+01 -8.1256E+02 2.1729E+04 -4.1093E+05 5.4344E+06 -5.0892E+07 3.4218E+08 S4 8.3521E+00 -5.1719E+02 1.6052E+04 -3.1508E+05 4.1683E+06 -3.8591E+07 2.5588E+08 S5 -6.0964E+00 3.8114E+02 -1.3510E+04 2.9906E+05 -4.4263E+06 4.5738E+07 -3.3853E+08 S6 3.3197E+00 -1.6871E+02 5.6477E+03 -1.2164E+05 1.7708E+06 -1.7957E+07 1.2944E+08 Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.1830E+03 4.0813E+03 -3.5159E+03 2.0315E+03 -7.5638E+02 1.6424E+02 -1.5877E+01 S2 -5.1693E+06 9.0816E+06 -1.1499E+07 1.0207E+07 -6.0219E+06 2.1193E+06 -3.3642E+05 S3 -1.6652E+09 5.8645E+09 -1.4785E+10 2.5991E+10 -3.0241E+10 2.0919E+10 -6.5113E+09 S4 -1.2295E+09 4.2864E+09 -1.0729E+10 1.8778E+10 -2.1808E+10 1.5088E+10 -4.7051E+09 S5 1.8175E+09 -7.0871E+09 1.9854E+10 -3.8904E+10 5.0577E+10 -3.9157E+10 1.3655E+10 S6 -6.7074E+08 2.5031E+09 -6.6635E+09 1.2338E+10 -1.5090E+10 1.0957E+10 -3.5762E+09

[0094] Table 3

[0095] Figure 2a The distortion curve of the camera system of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 2b The axial chromatic aberration curve of the imaging system of Example 1 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the lens. Figure 2c FIG. 2 shows the astigmatism curve of the imaging system of Example 1, which indicates the meridional image plane curvature and the sagittal image plane curvature. Figure 2a to Figure 2c It can be seen from the figure that the camera system provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0097] Figure 3 Schematic diagram of the lens group structure of the camera system embodiment 2 of the present invention. The camera system includes, from the object side to the image side along the optical axis, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a filter E4 and an imaging surface S9.

[0098] The first lens E1 has positive power, its object side surface S1 is concave, and its image side surface S2 is convex. The second lens E2 has negative power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is convex. The filter E4 has an object side surface S7 and an image side surface S8. The light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0099] As shown in Table 4, it is a basic parameter table of the camera system of Example 2, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0100]

[0101] Table 4

[0102] As shown in Table 5, in Example 2, the total effective focal length f of the camera system is 1.53 mm, half of the diagonal length of the effective pixel area on the imaging plane of the camera system is ImgH=1.18 mm, half of the maximum field of view of the camera system is Semi-FOV=37.81°, and the aperture value Fno of the camera system is 1.18.

[0103]

[0104] Table 5

[0105] The camera system in Embodiment 2 satisfies:

[0106] TS3 / TTL=0.21; wherein TS3 is the distance from the aperture of the camera system to the image side surface of the third lens on the optical axis, and TTL is the distance from the object side surface of the first lens of the camera system to the imaging surface on the optical axis.

[0107] R4 / EPD=0.43; wherein R4 is the radius of curvature of the image side surface of the second lens, and EPD is the entrance pupil diameter of the camera system.

[0108] R2 / f2=0.14; wherein R2 is the radius of curvature of the image side of the first lens, and f2 is the effective focal length of the second lens.

[0109] ET1 / CT1=0.97; wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.

[0110] f1 / f3=2.02; wherein f1 is the effective focal length of the first lens, and f3 is the effective focal length of the third lens.

[0111] 3×(CT1+CT2+CT3) / (V1+V2-V3)=0.08; wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, V1 is the dispersion coefficient of the first lens, V2 is the dispersion coefficient of the second lens, and V3 is the dispersion coefficient of the third lens.

[0112] Sag11 / Dt11=-0.15; wherein Sag11 is the on-axis distance between the intersection of the first lens object side and the optical axis to the effective radius vertex of the first lens object side, and Dt11 is the maximum effective radius of the first lens object side.

[0113] Sag22 / Dt22=0.24; wherein Sag22 is the on-axis distance between the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens, and Dt22 is the maximum effective radius of the image side surface of the second lens.

[0114] |Sag31| / Dt31=0.04; wherein Sag31 is the on-axis distance between the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens, and Dt31 is the maximum effective radius of the object side surface of the third lens.

[0115] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the third lens E3 are aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A63, A70, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 and A 24 .

[0116] Face number A4 A6 A8 A10 A12 A14 S1 1.5139E-01 2.6934E+00 -2.0088E+01 8.4404E+01 -2.2894E+02 4.2349E+02 S2 1.8388E-01 8.3881E+00 -6.6313E+01 2.2922E+02 -5.9763E+01 -2.7671E+03 S3 2.4557E+00 -1.7350E+02 4.8965E+03 -8.0802E+04 8.6039E+05 -6.2420E+06 S4 2.2144E+00 -2.2936E+02 6.1322E+03 -9.5982E+04 9.8088E+05 -6.8956E+06 S5 -2.1831E+00 1.2521E+02 -4.0686E+03 7.6737E+04 -9.3179E+05 7.7298E+06 S6 3.1352E-01 -9.1458E+00 3.1815E+02 -6.3515E+03 7.8477E+04 -6.3626E+05 Face number A16 A18 A20 A22 A24 S1 -5.4942E+02 5.0609E+02 -3.3089E+02 1.5147E+02 -4.7046E+01 S2 1.2698E+04 -3.1117E+04 4.9155E+04 -5.2402E+04 3.7632E+04 S3 3.1856E+07 -1.1632E+08 3.0521E+08 -5.7077E+08 7.4215E+08 S4 3.4375E+07 -1.2347E+08 3.2073E+08 -5.9726E+08 7.7740E+08 S5 -4.5313E+07 1.9095E+08 -5.8073E+08 1.2632E+09 -1.9157E+09 S6 3.5265E+06 -1.3695E+07 3.7646E+07 -7.2949E+07 9.7497E+07

[0117] Table 6

[0118] Figure 4a The distortion curve of the camera system of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4b The axial chromatic aberration curve of the camera system of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4c FIG. 2 shows the astigmatism curve of the imaging system of Example 2, which indicates the meridional image plane curvature and the sagittal image plane curvature. Figures 4a to 4c It can be seen from the figure that the camera system provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0120] Figure 5 Schematic diagram of the lens group structure of the camera system embodiment 3 of the present invention. The camera system includes, from the object side to the image side along the optical axis, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a filter E4 and an imaging surface S9.

[0121] The first lens E1 has positive power, its object side surface S1 is concave, and its image side surface S2 is convex. The second lens E2 has negative power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is convex. The filter E4 has an object side surface S7 and an image side surface S8. The light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0122] As shown in Table 7, it is a basic parameter table of the camera system of Example 3, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0123]

[0124] Table 7

[0125] As shown in Table 8, in Example 3, the total effective focal length f of the camera system is 1.26 mm, and half of the diagonal length of the effective pixel area on the imaging plane of the camera system is ImgH=1.18 mm. Half of the maximum field of view angle of the camera system is Semi-FOV=43.43°. The aperture value Fno of the camera system is 1.21.

[0126]

[0127] Table 8

[0128] The camera system in Embodiment 3 satisfies:

[0129] TS3 / TTL=0.23; wherein TS3 is the distance from the aperture of the camera system to the image side surface of the third lens on the optical axis, and TTL is the distance from the object side surface of the first lens of the camera system to the imaging surface on the optical axis.

[0130] R4 / EPD=0.64; wherein R4 is the radius of curvature of the image side surface of the second lens, and EPD is the entrance pupil diameter of the camera system.

[0131] R2 / f2=0.35; wherein R2 is the radius of curvature of the image side of the first lens, and f2 is the effective focal length of the second lens.

[0132] ET1 / CT1=1.01; wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.

[0133] f1 / f3=0.91; wherein f1 is the effective focal length of the first lens, and f3 is the effective focal length of the third lens.

[0134] 3×(CT1+CT2+CT3) / (V1+V2-V3)=0.08; wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, V1 is the dispersion coefficient of the first lens, V2 is the dispersion coefficient of the second lens, and V3 is the dispersion coefficient of the third lens.

[0135] Sag11 / Dt11=-0.11; wherein Sag11 is the on-axis distance between the intersection of the first lens object side and the optical axis to the effective radius vertex of the first lens object side, and Dt11 is the maximum effective radius of the first lens object side.

[0136] Sag22 / Dt22=0.20; wherein Sag22 is the on-axis distance between the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens, and Dt22 is the maximum effective radius of the image side surface of the second lens.

[0137] |Sag31| / Dt31=0.04; wherein Sag31 is the on-axis distance between the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens, and Dt31 is the maximum effective radius of the object side surface of the third lens.

[0138] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the third lens E3 are aspherical surfaces. Table 9 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A5 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0139] Face number A4 A6 A8 A10 A12 A14 A16 S1 9.8536E-01 -8.1641E+00 7.6445E+01 -4.7572E+02 2.0020E+03 -5.8730E+03 1.2250E+04 S2 9.4284E+00 -1.4234E+02 1.9650E+03 -2.0203E+04 1.4888E+05 -7.8669E+05 3.0055E+06 S3 1.5277E+01 -5.3369E+02 1.5499E+04 -3.1957E+05 4.6009E+06 -4.6846E+07 3.4193E+08 S4 9.7216E+00 -6.2122E+02 1.9150E+04 -3.7396E+05 4.9355E+06 -4.5631E+07 3.0188E+08 S5 4.9619E+00 -3.3411E+02 1.0759E+04 -2.1056E+05 2.7089E+06 -2.3959E+07 1.4937E+08 S6 4.9694E+00 -2.6609E+02 8.8772E+03 -1.8395E+05 2.5227E+06 -2.3916E+07 1.6104E+08 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.9769E+04 -1.5149E+04 8.0491E+03 -2.8160E+03 5.8298E+02 -5.4076E+01 1.9769E+04 S2 1.6823E+07 -2.4313E+07 2.4523E+07 -1.6376E+07 6.4996E+06 -1.1600E+06 1.6823E+07 S3 6.8698E+09 -1.8701E+10 3.5438E+10 -4.4381E+10 3.3001E+10 -1.1029E+10 6.8698E+09 S4 4.9978E+09 -1.2378E+10 2.1365E+10 -2.4394E+10 1.6548E+10 -5.0478E+09 4.9978E+09 S5 2.0990E+09 -4.6571E+09 7.0151E+09 -6.7354E+09 3.6306E+09 -7.9784E+08 2.0990E+09 S6 2.7363E+09 -6.8550E+09 1.1970E+10 -1.3831E+10 9.4989E+09 -2.9348E+09 2.7363E+09

[0140] Table 9

[0141] Figure 6a The distortion curve of the camera system of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 6b The axial chromatic aberration curve of the camera system of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6c FIG. 2 shows the astigmatism curve of the imaging system of Example 3, which indicates the meridional image plane curvature and the sagittal image plane curvature. Figures 6a to 6cIt can be seen from the figure that the camera system provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0143] Figure 7 Schematic diagram of the lens group structure of the camera system embodiment 4 of the present invention. The camera system includes, from the object side to the image side along the optical axis, a first lens E1, an aperture STO, a second lens E2, a third lens E3, a filter E4 and an imaging surface S9.

[0144] The first lens E1 has positive power, its object side surface S1 is concave, and its image side surface S2 is convex. The second lens E2 has negative power, its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is convex. The filter E4 has an object side surface S7 and an image side surface S8. The light from the object passes through each surface S1 to S8 in sequence and is finally imaged on the imaging surface S9.

[0145] As shown in Table 10, it is a basic parameter table of the camera system of Example 4, wherein the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0146]

[0147] Table 10

[0148] As shown in Table 11, in Example 4, the total effective focal length f of the camera system is 1.24 mm, and half of the diagonal length of the effective pixel area on the imaging plane of the camera system is ImgH=1.18 mm. Half of the maximum field of view of the camera system is Semi-FOV=37.48°. The aperture value Fno of the camera system is 1.13.

[0149]

[0150] Table 11

[0151] The camera system in Embodiment 4 satisfies:

[0152] TS3 / TTL=0.27; wherein TS3 is the distance from the aperture of the camera system to the image side surface of the third lens on the optical axis, and TTL is the distance from the object side surface of the first lens of the camera system to the imaging surface on the optical axis.

[0153] R4 / EPD=0.71; wherein R4 is the radius of curvature of the image side surface of the second lens, and EPD is the entrance pupil diameter of the camera system.

[0154] R2 / f2=0.35; wherein R2 is the radius of curvature of the image side of the first lens, and f2 is the effective focal length of the second lens.

[0155] ET1 / CT1=0.76; wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.

[0156] f1 / f3=0.63; wherein f1 is the effective focal length of the first lens, and f3 is the effective focal length of the third lens.

[0157] 3×(CT1+CT2+CT3) / (V1+V2-V3)=0.03; wherein CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, V1 is the dispersion coefficient of the first lens, V2 is the dispersion coefficient of the second lens, and V3 is the dispersion coefficient of the third lens.

[0158] Sag11 / Dt11=-0.14; wherein Sag11 is the on-axis distance between the intersection of the first lens object side and the optical axis to the effective radius vertex of the first lens object side, and Dt11 is the maximum effective radius of the first lens object side.

[0159] Sag22 / Dt22=0.25; wherein Sag22 is the on-axis distance between the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens, and Dt22 is the maximum effective radius of the image side surface of the second lens.

[0160] |Sag31| / Dt31=0.07; wherein Sag31 is the on-axis distance between the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens, and Dt31 is the maximum effective radius of the object side surface of the third lens.

[0161] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the third lens E3 are aspherical surfaces. Table 12 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0162] Face number A4 A6 A8 A10 A12 A14 A16 S1 8.2194E-03 3.2413E+00 -1.9121E+01 5.5193E+01 -1.6450E+01 -4.2005E+02 1.5918E+03 S2 1.3491E+01 -2.1209E+02 2.6142E+03 -2.3016E+04 1.4443E+05 -6.5280E+05 2.1476E+06 S3 2.4062E+01 -8.1256E+02 2.1729E+04 -4.1093E+05 5.4344E+06 -5.0892E+07 3.4218E+08 S4 8.3521E+00 -5.1719E+02 1.6052E+04 -3.1508E+05 4.1683E+06 -3.8591E+07 2.5588E+08 S5 -6.0964E+00 3.8114E+02 -1.3510E+04 2.9906E+05 -4.4263E+06 4.5738E+07 -3.3853E+08 S6 3.3197E+00 -1.6871E+02 5.6477E+03 -1.2164E+05 1.7708E+06 -1.7957E+07 1.2944E+08 Face number A18 A20 A22 A24 A26 A28 A30 S1 -3.1830E+03 4.0813E+03 -3.5159E+03 2.0315E+03 -7.5638E+02 1.6424E+02 -1.5877E+01 S2 -5.1693E+06 9.0816E+06 -1.1499E+07 1.0207E+07 -6.0219E+06 2.1193E+06 -3.3642E+05 S3 -1.6652E+09 5.8645E+09 -1.4785E+10 2.5991E+10 -3.0241E+10 2.0919E+10 -6.5113E+09 S4 -1.2295E+09 4.2864E+09 -1.0729E+10 1.8778E+10 -2.1808E+10 1.5088E+10 -4.7051E+09 S5 1.8175E+09 -7.0871E+09 1.9854E+10 -3.8904E+10 5.0577E+10 -3.9157E+10 1.3655E+10 S6 -6.7074E+08 2.5031E+09 -6.6635E+09 1.2338E+10 -1.5090E+10 1.0957E+10 -3.5762E+09

[0163] Table 12

[0164] Figure 8aThe distortion curve of the camera system of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8b The axial chromatic aberration curve of the camera system of Example 4 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 8c FIG. 4 shows the astigmatism curve of the imaging system of Example 4, which indicates the meridional image plane curvature and the sagittal image plane curvature. Figures 8a to 8c It can be seen from the figure that the camera system provided in Example 4 can achieve good imaging quality.

[0165] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A camera system, characterized in that: Along the optical axis from the object side to the image side, they include: The first lens has positive power, its object side surface is concave and its image side surface is convex; A second lens having negative optical power, whose image side surface is concave; The third lens has positive power, and its object side surface is convex and its image side surface is convex; The distance TS3 from the aperture of the camera system to the image side of the third lens on the optical axis and the distance TTL from the object side of the first lens of the camera system to the imaging surface on the optical axis satisfy: 0.2 <TS3 / TTL<0.3; The curvature radius R4 of the image side of the second lens and the entrance pupil diameter EPD of the camera system meet the following conditions: 0.4 <R4 / EPD≤0.73; The f-number Fno of the camera system satisfies: 1.13≤Fno<1.23; The curvature radius R2 of the image side of the first lens and the effective focal length f2 of the second lens satisfy: 0.1 <R2 / f2<0.4; The effective focal length f1 of the first lens and the effective focal length f3 of the third lens satisfy: 0.6 <f1 / f3≤2.02。 2. The camera system according to claim 1, characterized in that: The edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: 0.76≤ET1 / CT1≤1.

1.

3. The camera system according to claim 1, characterized in that: The center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens and the dispersion coefficient V3 of the third lens satisfy: 0.03mm≤3×(CT1+CT2+CT3) / (V1+V2-V3)<0.1mm.

4. The camera system according to claim 1, characterized in that: The on-axis distance Sag11 between the intersection of the first lens object side surface and the optical axis to the effective radius vertex of the first lens object side surface and the maximum effective radius Dt11 of the first lens object side surface satisfy: -0.16≤Sag11 / Dt11<-0.

1.

5. The camera system according to claim 1, characterized in that: The on-axis distance Sag22 from the intersection of the second lens image side surface and the optical axis to the effective radius vertex of the second lens image side surface and the maximum effective radius Dt22 of the second lens image side surface satisfy: 0.17≤Sag22 / Dt22≤0.

25.

6. The camera system according to claim 1, characterized in that: The on-axis distance Sag31 between the intersection of the third lens object side and the optical axis to the effective radius vertex of the third lens object side and the maximum effective radius Dt31 of the third lens object side satisfy: 0.03≤|Sag31| / Dt31<0.1.

Images