An optical imaging system

Abstract

The present invention discloses an optical imaging system, which sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power; a second lens with an optical power; a third lens with an optical power; a fourth lens with an optical power; a fifth lens with a negative optical power, whose object side is concave; and a sixth lens with an optical power; wherein, the maximum field of view angle FOV of the optical imaging system satisfies: 90° < FOV < 120°; the on-axis distance TTL from the object side of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: TTL / ImgH < 1.9; the air gap T56 between the fifth lens and the sixth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: T56 / CT4 > 0.3. By reasonably configuring the optical power and surface shape of the optical imaging system, it is beneficial to meet the requirements of lens miniaturization, balance and correction of various aberrations of the optical lens, and high-definition imaging requirements of the wide-angle lens.

Description

Technical Field

[0001] The present invention belongs to the field of optical imaging, and particularly relates to an optical imaging system including six lenses. Background Art

[0002] In recent years, with the rapid development of electronic products, people's demands for future intelligent devices have not been limited to smartphones only. Devices such as smart glasses and smart watches have gradually become popular and penetrated into people's lives. The development of intelligent devices by major manufacturers is constantly expanding. Therefore, in order to facilitate portability and meet the high shooting requirements of devices, the requirements for optical systems have been gradually increased.

[0003] In order to meet the current people's demands for electronic products and promote the development of intelligent devices, the present invention aims to provide a six-piece wide-angle lens with miniaturization, large field of view and high image quality. Summary of the Invention

[0004] The present invention aims to provide an optical imaging system with miniaturization, large field of view and high image quality, which is composed of six lenses.

[0005] The present invention provides an optical imaging system, which sequentially includes, from the object side to the image side along the optical axis: a first lens with negative optical power; a second lens with optical power; a third lens with optical power; a fourth lens with optical power; a fifth lens with negative optical power, whose object side is concave; a sixth lens with optical power;

[0006] Wherein, the maximum field of view angle FOV of the optical imaging system satisfies: 90° < FOV < 120°; the on-axis distance TTL from the object side of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL / ImgH < 1.9; the air gap T56 between the fifth lens and the sixth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: T56 / CT4 > 0.3.

[0007] According to an embodiment of the present invention, the effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy: f / f4 < 1.6.

[0008] According to an embodiment of the present invention, the combined focal length f234 of the second lens, the third lens and the fourth lens and the effective focal length f2 of the second lens satisfy: f234 / f2 < 1.3.

[0009] According to an embodiment of the present invention, the central thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: CT1 / (T12 + CT2) < 1.0.

[0010] According to an embodiment of the present invention, the axial distance SAG32 between the intersection point of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens and the axial distance SAG31 between the intersection point of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens satisfy: |SAG32 / SAG31| < 1.2.

[0011] According to an embodiment of the present invention, the edge thickness ET6 of the sixth lens and the axial distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens satisfy: -1.6 < ET6 / SAG61 < -0.4.

[0012] According to an embodiment of the present invention, the edge thickness ET4 of the fourth lens and the edge thickness ET3 of the third lens satisfy: |(ET4 - ET3) / ET3| < 0.8.

[0013] According to an embodiment of the present invention, the effective focal length f of the optical imaging system and the curvature radius R5 of the object side surface of the third lens satisfy: |f / R5| < 0.8.

[0014] According to an embodiment of the present invention, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy: |R9 / R10| < 1.4.

[0015] According to an embodiment of the present invention, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: |(R3 + R4) / (R3 - R4)| < 0.6.

[0016] According to an embodiment of the present invention, the effective semi-aperture DT42 of the image side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -1.0 < DT42 / R8 < -0.2.

[0017] According to an embodiment of the present invention, the effective semi-aperture DT21 of the object side surface of the second lens and the effective semi-aperture DT11 of the object side surface of the first lens satisfy: 0.4 < DT21 / DT11 < 1.2.

[0018] Advantages of the present invention:

[0019] The optical imaging system provided by the present invention includes multiple lenses, such as the first lens to the sixth lens. By reasonably configuring the optical power and surface type of the optical imaging system and meeting the above conditions, it is beneficial to meet the requirements of lens miniaturization, is beneficial to the optical lens to balance and correct various aberrations, and meets the high-definition imaging requirements of wide-angle lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Schematic diagram of the lens group structure of Embodiment 1 of the optical imaging system of the present invention;

[0022] Figures 2a to 2d Axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of Embodiment 1 of the optical imaging system of the present invention respectively;

[0023] Figure 3 Schematic diagram of the lens group structure of Embodiment 2 of the optical imaging system of the present invention;

[0024] Figures 4a to 4d Axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of Embodiment 2 of the optical imaging system of the present invention respectively;

[0025] Figure 5 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging system of the present invention;

[0026] Figures 6a to 6d Axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of Embodiment 3 of the optical imaging system of the present invention respectively;

[0027] Figure 7 Schematic diagram of the lens group structure of Embodiment 4 of the optical imaging system of the present invention;

[0028] Figures 8a to 8d Axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of Embodiment 4 of the optical imaging system of the present invention respectively;

[0029] Figure 9 Schematic diagram of the lens group structure of Embodiment 5 of the optical imaging system of the present invention;

[0030] Figures 10a to 10d Axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of Embodiment 5 of the optical imaging system of the present invention respectively;

[0031] Figure 11 Schematic diagram of the lens group structure of Embodiment 6 of the optical imaging system of the present invention;

[0032] Figures 12a to 12dThey are respectively the axial chromatic aberration curve, astigmatism curve, distortion curve and longitudinal chromatic aberration curve of Embodiment 6 of the optical imaging system of the present invention. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0035] It should also be understood that the terms "comprises", "comprising", "has", "including" and / or "including" 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 an expression such as "at least one of......" appears after the list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0036] In the drawings, for the sake of clarity, the thickness, size and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustration only and are not drawn to an exact scale.

[0037] 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 to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0038] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0039] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may 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 drawings and in conjunction with the embodiments.

[0040] Exemplary Embodiment

[0041] The present invention provides an optical imaging system, which sequentially includes, from the object side to the image side along the optical axis: a first lens with a negative optical power; a second lens with an optical power; a third lens with an optical power; a fourth lens with an optical power; a fifth lens with a negative optical power, the object side surface of which is concave; a sixth lens with an optical power; wherein, the maximum field of view angle FOV of the optical imaging system satisfies: 90° < FOV < 120°; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: TTL / ImgH < 1.9; the air gap T56 between the fifth lens and the sixth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: T56 / CT4 > 0.3. When the optical power and surface shape of the optical imaging system are reasonably configured and the above conditions are met, it is beneficial to meet the requirements of lens miniaturization, is beneficial for the optical lens to balance and correct various aberrations, and meets the high-definition imaging requirements of a wide-angle lens.

[0042] In this exemplary embodiment, the effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy: f / f4 < 1.6. When the above conditions are met, the effective focal length of the fourth lens is controlled, which is beneficial for correcting axial chromatic aberration. More specifically, the effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy: f / f4 < 1.51.

[0043] In this exemplary embodiment, the combined focal length f234 of the second lens, the third lens, and the fourth lens and the effective focal length f2 of the second lens satisfy: f234 / f2 < 1.3. When the above conditions are met, it is beneficial for reasonably distributing the optical power and correcting monochromatic aberrations. More specifically, the combined focal length f234 of the second lens, the third lens, and the fourth lens and the effective focal length f2 of the second lens satisfy: f234 / f2 < 1.1.

[0044] In the present exemplary embodiment, the central thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: CT1 / (T12 + CT2) < 1.0. When the above conditions are met, while meeting the processing and production requirements, it is beneficial to balance the field area of the off-axis field of view. More specifically, the central thickness CT1 of the first lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: CT1 / (T12 + CT2) < 0.8.

[0045] In the present exemplary embodiment, the axial distance SAG32 between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens and the axial distance SAG31 between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens satisfy: |SAG32 / SAG31| < 1.2. When the above conditions are met, it is beneficial to meet the processability of the system, and the overall imaging quality is guaranteed. More specifically, the axial distance SAG32 between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens and the axial distance SAG31 between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens satisfy: |SAG32 / SAG31| < 1.1.

[0046] In the present exemplary embodiment, the edge thickness ET6 of the sixth lens and the axial distance SAG61 between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens satisfy: -1.6 < ET6 / SAG61 < -0.4. When the above conditions are met, while ensuring the requirements of processing technology, the influence of ghost images in the optical system is reduced. More specifically, the edge thickness ET6 of the sixth lens and the axial distance SAG61 between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens satisfy: -1.4 < ET6 / SAG61 < -0.5.

[0047] In the present exemplary embodiment, the edge thickness ET4 of the fourth lens and the edge thickness ET3 of the third lens satisfy: |(ET4 - ET3) / ET3| < 0.8. When the above conditions are met, the sizes of the middle two lenses are balanced, which is beneficial to correcting lateral chromatic aberration. More specifically, the edge thickness ET4 of the fourth lens and the edge thickness ET3 of the third lens satisfy: |(ET4 - ET3) / ET3| < 0.6.

[0048] In this exemplary embodiment, the effective focal length f of the optical imaging system and the radius of curvature R5 of the object side surface of the third lens satisfy: |f / R5| < 0.8. When the above conditions are met, the radius of curvature of the image side surface of the third lens of the optical system is restricted, which is beneficial to correcting axial chromatic aberration. More specifically, the effective focal length f of the optical imaging system and the radius of curvature R5 of the object side surface of the third lens satisfy: |f / R5| < 0.7.

[0049] In this exemplary embodiment, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: |R9 / R10| < 1.4. When the above conditions are met, it is beneficial to correct field curvature and reduce the influence of ghost images. More specifically, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: |R9 / R10| < 1.3.

[0050] In this exemplary embodiment, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: |(R3 + R4) / (R3 - R4)| < 0.6. When the above conditions are met, it is beneficial to system balance and correct lateral chromatic aberration and axial chromatic aberration. More specifically, the radius of curvature R3 of the object side surface of the second lens and the radius of curvature R4 of the image side surface of the second lens satisfy: |(R3 + R4) / (R3 - R4)| < 0.4.

[0051] In this exemplary embodiment, the effective semi-aperture DT42 of the image side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -1.0 < DT42 / R8 < -0.2. When the above conditions are met, it is beneficial to correct the monochromatic aberration of the system. More specifically, the effective semi-aperture DT42 of the image side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: -0.9 < DT42 / R8 < -0.4.

[0052] In this exemplary embodiment, the effective semi-aperture DT21 of the object side surface of the second lens and the effective semi-aperture DT11 of the object side surface of the first lens satisfy: 0.4 < DT21 / DT11 < 1.2. When the above conditions are met, it is beneficial to correct lateral chromatic aberration. More specifically, the effective semi-aperture DT21 of the object side surface of the second lens and the effective semi-aperture DT11 of the object side surface of the first lens satisfy: 0.5 < DT21 / DT11 < 1.1.

[0053] In this exemplary embodiment, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0054]

[0055] Wherein, x is the sagitta of the aspheric surface along the optical axis at a position with a height of h, which is the distance from the vertex of the aspheric surface; c is the paraxial curvature of the aspheric surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface.

[0056] In this exemplary embodiment, the above optical imaging system may further include a diaphragm. The diaphragm can be set at an appropriate position as needed. For example, the diaphragm can be set between the object side and the first lens. Optionally, the above optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0057] The optical imaging system according to the above embodiment of the present invention can adopt multiple lenses, such as the six lenses mentioned above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the axial spacing between each lens, etc., the optical imaging system has a large imaging image plane, has the characteristics of a wide imaging range and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0058] In the exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric 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 sixth lens is an aspheric mirror surface. The characteristics of an aspheric lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspheric lens has better radius of curvature characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspheric lens, it is possible to eliminate the aberration that appears during imaging 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 of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspheric mirror surface. Optionally, both the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are aspheric mirror surfaces.

[0059] However, those skilled in the art should understand that without departing from the technical solutions claimed in this application, the number of lenses constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical imaging system is not limited to including six lenses. If necessary, the optical imaging system may further include other numbers of lenses.

[0060] The following further describes specific embodiments of the optical imaging system applicable to the above embodiments with reference to the accompanying drawings. Specific Embodiment 1

[0062] Figure 1 FIG. 1 is a schematic structural diagram of the lens group according to Embodiment 1 of the optical imaging system of the present invention. The optical imaging system sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0063] The first lens E1 has a negative optical power. Its object surface S1 is concave, and its image surface S2 is concave. The second lens E2 has a positive optical power. Its object surface S3 is convex, and its image surface S4 is convex. The third lens E3 has a negative optical power. Its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a positive optical power. Its object surface S7 is convex, and its image surface S8 is convex. The fifth lens E5 has a negative optical power. Its object surface S9 is concave, and its image surface S10 is concave. The sixth lens E6 has a negative optical power. Its object surface S11 is concave, and its image surface S12 is concave. The filter E7 has an object surface S3 and an image surface S14. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0064] As shown in Table 1, it is the basic parameter table of the optical imaging system of Embodiment 1, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0065]

[0066]

[0067] Table 1

[0068] As shown in Table 2, in Embodiment 1, the total effective focal length f of the optical imaging system is 2.82 mm, the distance TTL on the optical axis from the object surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging system is 4.55 mm, and half of the diagonal length of the effective pixel region on the imaging surface S15 is ImgH = 2.61 mm. Half of the maximum field of view angle of the optical imaging lens is Semi - FOV = 53.7°.

[0069]

[0070] Table 2

[0071] The optical imaging system in Embodiment 1 satisfies:

[0072] ImgH = 2.61. Where ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

[0073] TTL / ImgH = 1.74, where TTL is the on-axis distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0074] f / EPD = 2.22, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0075] FOV = 107.5°, where FOV is the maximum field of view angle of the optical imaging system.

[0076] T56 / CT4 = 1.04, where T56 is the air gap between the fifth lens and the sixth lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis.

[0077] f / f4 = 1.42, where f is the effective focal length of the optical imaging system, and f4 is the effective focal length of the fourth lens.

[0078] f234 / f2 = 0.46, where f234 is the combined focal length of the second, third, and fourth lenses, and f2 is the effective focal length of the second lens.

[0079] CT1 / (T12 + CT2) = 0.59, where CT1 is the central thickness of the first lens on the optical axis, T12 is the air gap between the first lens and the second lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis.

[0080] SAG32 / SAG31 = 0.32, where SAG32 is the on-axis distance between the intersection of the image side of the third lens and the optical axis and the vertex of the effective radius of the image side of the third lens, and SAG31 is the on-axis distance between the intersection of the object side of the third lens and the optical axis and the vertex of the effective radius of the object side of the third lens.

[0081] ET6 / SAG61 = -0.83, where ET6 is the edge thickness of the sixth lens, and SAG61 is the on-axis distance between the intersection of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens.

[0082] (ET4 - ET3) / ET3 = 0.43, where ET4 is the edge thickness of the fourth lens, and ET3 is the edge thickness of the third lens.

[0083] |f / R5| = 0.47, where f is the effective focal length of the optical imaging system, and R5 is the radius of curvature of the object side of the third lens.

[0084] |R9 / R10| = 1.04, where R9 is the radius of curvature of the object side of the fifth lens, and R10 is the radius of curvature of the image side of the fifth lens.

[0085] |(R3 + R4) / (R3 - R4)| = 0.14, where R3 is the curvature radius of the object side of the second lens, and R4 is the curvature radius of the image side of the second lens.

[0086] DT42 / R8 = -0.69, where DT42 is the effective semi-aperture of the image side of the fourth lens, and R8 is the curvature radius of the image side of the fourth lens.

[0087] DT21 / DT11 = 0.96, where DT21 is the effective semi-aperture of the object side of the second lens, and DT11 is the effective semi-aperture of the object side of the first lens.

[0088] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 3 shows the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 for each of the aspherical mirror surfaces S1 - S12 in Embodiment 1.

[0089] Face number A4 A6 A8 A10 A12 S1 -8.2699E-02 5.6491E-02 6.6856E-02 -1.9390E-01 2.7110E-01 S2 -1.3256E-01 1.5346E-01 3.6129E-01 -1.2636E+00 2.2339E+00 S3 -4.1342E-02 -2.0053E-01 3.3790E-01 -3.8900E-01 -2.5219E-01 S4 -1.9900E-01 -2.1586E-01 9.9182E-01 -3.4466E+00 7.6117E+00 S5 -2.4590E-01 1.6190E-02 -6.5380E-01 2.5561E+00 -3.4415E+00 S6 8.8688E-03 -1.9998E-01 2.3614E-01 -2.3860E-01 3.1381E-01 S7 -1.0277E-01 4.4706E-01 -1.0356E+00 1.3625E+00 -1.4706E+00 S8 -5.0937E-02 2.4076E-01 -6.0557E-01 9.2023E-01 -8.6944E-01 S9 -6.5358E-02 1.6188E-01 -4.5942E-01 6.2332E-01 -4.2755E-01 S10 1.0969E-02 -1.1073E-01 1.4708E-01 -1.6465E-01 1.5308E-01 S11 -4.2689E-01 3.7307E-01 -2.9619E-01 1.7080E-01 -9.7072E-02 S12 -1.9177E-01 1.8287E-01 -1.2694E-01 5.8938E-02 -1.8497E-02 Face number A14 A16 A18 A20 S1 -1.8291E-01 4.6941E-02 0.0000E+00 0.0000E+00 S2 -1.6535E+00 7.6632E-01 0.0000E+00 0.0000E+00 S3 7.2848E-01 1.5455E-01 0.0000E+00 0.0000E+00 S4 -9.0328E+00 4.3815E+00 0.0000E+00 0.0000E+00 S5 2.0687E+00 -4.6557E-01 0.0000E+00 0.0000E+00 S6 -2.1994E-01 5.4734E-02 0.0000E+00 0.0000E+00 S7 1.5068E+00 -1.0896E+00 4.2947E-01 -6.8615E-02 S8 4.9994E-01 -1.5868E-01 1.9843E-02 8.4954E-04 S9 1.5033E-01 -2.2843E-02 0.0000E+00 0.0000E+00 S10 -8.4988E-02 2.3771E-02 -2.6121E-03 0.0000E+00 S11 4.9587E-02 -1.4476E-02 1.6540E-03 0.0000E+00 S12 3.7626E-03 -4.5308E-04 2.6131E-05 -3.1438E-07

[0090] Table 3

[0091] Figure 2a shows the axial chromatic aberration curve of the optical imaging system of Embodiment 1, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 2b shows the astigmatism curve of the optical imaging system of Embodiment 1, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 2c shows the distortion curve of the optical imaging system of Embodiment 1, which represents the distortion magnitude values corresponding to different image heights. Figure 2d shows the longitudinal chromatic aberration curve of the optical imaging system of Embodiment 1, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 2a to 2d as shown, the optical imaging system given in Embodiment 1 can achieve good imaging quality. Specific Embodiment 2

[0093] Figure 3 This is a schematic diagram of the lens group structure of Embodiment 2 of the optical imaging system of the present invention. The optical imaging system sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0094] The first lens E1 has a negative optical power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a positive optical power, its object side S3 is convex, and its image side S4 is convex. The third lens E3 has a negative optical power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a positive optical power, its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a negative optical power, its object side S9 is concave, and its image side S10 is convex. The sixth lens E6 has a negative optical power, its object side S11 is concave, and its image side S12 is concave. The filter E7 has an object side S3 and an image side S14. The light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0095] As shown in Table 4, it is the basic parameter table of the optical imaging system of Example 2, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0096]

[0097] Table 4

[0098] As shown in Table 5, in Example 2, the total effective focal length f of the optical imaging system is 2.82 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S15 of the optical imaging system is 4.66 mm, and half of the diagonal length of the effective pixel region on the imaging surface S15 is ImgH = 2.61 mm. Half of the maximum field of view angle of the optical imaging lens is Semi - FOV = 55.3°.

[0099]

[0100] Table 5

[0101] The optical imaging system in Example 2 satisfies:

[0102] ImgH = 2.61. Where ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

[0103] TTL / ImgH = 1.78, where TTL is the axial distance from the object side of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

[0104] f / EPD = 2.22, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0105] FOV = 110.5°, where FOV is the maximum field of view angle of the optical imaging system.

[0106] T56 / CT4 = 0.42, where T56 is the air space between the fifth lens and the sixth lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis.

[0107] f / f4 = 1.45, where f is the effective focal length of the optical imaging system, and f4 is the effective focal length of the fourth lens.

[0108] f234 / f2 = 0.64, where f234 is the combined focal length of the second, third, and fourth lenses, and f2 is the effective focal length of the second lens.

[0109] CT1 / (T12 + CT2) = 0.25, where CT1 is the central thickness of the first lens on the optical axis, T12 is the air space between the first lens and the second lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis.

[0110] SAG32 / SAG31 = 0.15, where SAG32 is the axial distance between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens, and SAG31 is the axial distance between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens.

[0111] ET6 / SAG61 = -1.20, where ET6 is the edge thickness of the sixth lens, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0112] (ET4 - ET3) / ET3 = 0.02, where ET4 is the edge thickness of the fourth lens, and ET3 is the edge thickness of the third lens.

[0113] |f / R5| = 0.33, where f is the effective focal length of the optical imaging system, and R5 is the radius of curvature of the object side surface of the third lens.

[0114] |R9 / R10| = 0.21, where R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0115] |(R3 + R4) / (R3 - R4)| = 0.20, where R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens.

[0116] DT42 / R8 = -0.79, where DT42 is the effective semi-aperture of the image side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0117] DT21 / DT11 = 0.71, where DT21 is the effective semi-aperture of the object side surface of the second lens, and DT11 is the effective semi-aperture of the object side surface of the first lens.

[0118] In Embodiment 2, both the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 6 shows the high-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 that can be used for each of the aspherical mirror surfaces S1 - S12 in Embodiment 2.

[0119] Face number A4 A6 A8 A10 A12 S1 5.6643E-02 -2.8007E-01 7.0644E-01 -1.0823E+00 9.8361E-01 S2 6.0464E-02 2.9918E-01 -2.7483E+00 1.4098E+01 -3.6427E+01 S3 -4.0564E-02 -4.9904E-02 5.2628E-01 -3.8772E+00 1.3011E+01 S4 -2.6120E-01 4.8888E-02 1.3317E-01 -1.1696E+00 2.7982E+00 S5 -2.5988E-01 7.5645E-02 -3.3663E-01 7.3141E-01 -7.3645E-01 S6 -6.4836E-02 -6.0501E-02 2.4478E-01 -4.0736E-01 3.5946E-01 S7 -5.7941E-02 1.3009E-01 -1.9439E-01 4.9863E-01 -1.2124E+00 S8 -9.0314E-02 2.1015E-01 -3.6539E-01 5.3897E-01 -6.1693E-01 S9 -1.6170E-01 1.1429E-01 -1.5675E-01 2.3350E-01 -2.1788E-01 S10 6.1149E-02 -2.9189E-01 3.5041E-01 -2.4657E-01 1.0276E-01 S11 -2.5936E-01 1.2661E-01 -1.2797E-01 1.3015E-01 -8.3145E-02 S12 -2.2095E-01 1.9787E-01 -1.4652E-01 8.1325E-02 -3.1994E-02 Face number A14 A16 A18 A20 S1 -4.4701E-01 6.6592E-02 0.0000E+00 0.0000E+00 S2 4.7679E+01 -2.4467E+01 0.0000E+00 0.0000E+00 S3 -2.1504E+01 1.3855E+01 0.0000E+00 0.0000E+00 S4 -3.2584E+00 1.4716E+00 0.0000E+00 0.0000E+00 S5 2.7402E-01 3.6983E-02 0.0000E+00 0.0000E+00 S6 -1.5511E-01 2.5030E-02 0.0000E+00 0.0000E+00 S7 1.6740E+00 -1.2555E+00 4.8935E-01 -7.8800E-02 S8 5.0271E-01 -2.7174E-01 8.7752E-02 -1.2576E-02 S9 1.0351E-01 -1.9583E-02 0.0000E+00 0.0000E+00 S10 -2.1639E-02 1.2180E-03 1.5483E-04 0.0000E+00 S11 3.4663E-02 -8.3254E-03 8.4322E-04 0.0000E+00 S12 8.5325E-03 -1.4585E-03 1.4342E-04 -6.1387E-06

[0120] Table 6

[0121] Figure 4a shows the axial chromatic aberration curve of the optical imaging system of Embodiment 2, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 4b shows the astigmatism curve of the optical imaging system of Embodiment 2, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 4c shows the distortion curve of the optical imaging system of Embodiment 2, which represents the distortion magnitude values corresponding to different image heights. Figure 4d shows the longitudinal chromatic aberration curve of the optical imaging system of Embodiment 2, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 4a to 4d as shown, the optical imaging system given in Embodiment 2 can achieve good imaging quality. Specific Embodiment 3

[0123] Figure 5 This is a schematic structural diagram of the lens group of Embodiment 3 of the optical imaging system of the present invention. The optical imaging system sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0124] The first lens E1 has a negative optical power. Its object side S1 is a concave surface, and its image side S2 is a concave surface. The second lens E2 has a positive optical power. Its object side S3 is a convex surface, and its image side S4 is a convex surface. The third lens E3 has a negative optical power. Its object side S5 is a convex surface, and its image side S6 is a concave surface. The fourth lens E4 has a positive optical power. Its object side S7 is a convex surface, and its image side S8 is a convex surface. The fifth lens E5 has a negative optical power. Its object side S9 is a concave surface, and its image side S10 is a concave surface. The sixth lens E6 has a negative optical power. Its object side S11 is a concave surface, and its image side S12 is a concave surface. The filter E7 has an object side S3 and an image side S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0125] As shown in Table 7, it is the basic parameter table of the optical imaging system in Embodiment 2. Among them, the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0126]

[0127] Table 7

[0128] As shown in Table 8, in Embodiment 3, the total effective focal length f of the optical imaging system is 2.82 mm. The distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S15 of the optical imaging system is 4.47 mm. Half of the diagonal length of the effective pixel region on the imaging surface S15 is ImgH = 2.61 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 55.3°.

[0129]

[0130]

[0131] Table 8

[0132] The optical imaging system in Embodiment 3 satisfies:

[0133] ImgH = 2.61. Among them, ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

[0134] TTL / ImgH = 1.71. Among them, TTL is the axial distance from the object side of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

[0135] f / EPD = 2.22. Among them, f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0136] FOV = 110.6°. Among them, FOV is the maximum field of view angle of the optical imaging system.

[0137] T56 / CT4 = 1.21. Among them, T56 is the air gap on the optical axis between the fifth lens and the sixth lens, and CT4 is the central thickness on the optical axis of the fourth lens.

[0138] f / f4 = 1.43. Among them, f is the effective focal length of the optical imaging system, and f4 is the effective focal length of the fourth lens.

[0139] f234 / f2 = 0.46. Among them, f234 is the combined focal length of the second, third, and fourth lenses, and f2 is the effective focal length of the second lens.

[0140] CT1 / (T12 + CT2) = 0.57, where CT1 is the central thickness of the first lens on the optical axis, T12 is the air gap between the first lens and the second lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis.

[0141] SAG32 / SAG31 = 0.12, where SAG32 is the axial distance between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens, and SAG31 is the axial distance between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens.

[0142] ET6 / SAG61 = -0.69, where ET6 is the edge thickness of the sixth lens, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0143] (ET4 - ET3) / ET3 = 0.45, where ET4 is the edge thickness of the fourth lens and ET3 is the edge thickness of the third lens.

[0144] |f / R5| = 0.46, where f is the effective focal length of the optical imaging system and R5 is the radius of curvature of the object side surface of the third lens.

[0145] |R9 / R10| = 0.67, where R9 is the radius of curvature of the object side surface of the fifth lens and R10 is the radius of curvature of the image side surface of the fifth lens.

[0146] |(R3 + R4) / (R3 - R4)| = 0.19, where R3 is the radius of curvature of the object side surface of the second lens and R4 is the radius of curvature of the image side surface of the second lens.

[0147] DT42 / R8 = -0.72, where DT42 is the effective semi-aperture of the image side surface of the fourth lens and R8 is the radius of curvature of the image side surface of the fourth lens.

[0148] DT21 / DT11 = 0.98, where DT21 is the effective semi-aperture of the object side surface of the second lens and DT11 is the effective semi-aperture of the object side surface of the first lens.

[0149] In Embodiment 3, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 9 shows the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 for each of the aspherical surfaces S1 - S12 in Embodiment 3.

[0150]

[0151]

[0152] Table 9

[0153] Figure 6a shows the axial chromatic aberration curve of the optical imaging system of Embodiment 3, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 6b shows the astigmatism curve of the optical imaging system of Embodiment 3, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 6c shows the distortion curve of the optical imaging system of Embodiment 3, which represents the distortion magnitude values corresponding to different image heights. Figure 6d shows the lateral chromatic aberration curve of the optical imaging system of Embodiment 3, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 6a to 6d as can be seen from the figure, the optical imaging system given in Embodiment 3 can achieve good imaging quality. Specific Embodiment 4

[0155] Figure 7 is a schematic structural diagram of the lens group of Embodiment 4 of the optical imaging system of the present invention. The optical imaging system sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0156] The first lens E1 has a negative optical power. Its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has a positive optical power. Its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has a negative optical power. Its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a positive optical power. Its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative optical power. Its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a negative optical power. Its object side surface S11 is concave, and its image side surface S12 is concave. The filter E7 has an object side surface S3 and an image side surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0157] As shown in Table 10, it is the basic parameter table of the optical imaging system of Embodiment 2, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0158]

[0159] Table 10

[0160] As shown in Table 11, in Embodiment 4, the total effective focal length f of the optical imaging system is 2.86 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S15 of the optical imaging system is 4.65 mm, and half of the diagonal length of the effective pixel region on the imaging surface S15 is ImgH = 2.61 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 55.3°.

[0161]

[0162] Table 11

[0163] The optical imaging system in Embodiment 4 satisfies:

[0164] ImgH = 2.61. Here, ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

[0165] TTL / ImgH = 1.78, where TTL is the axial distance from the object side of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

[0166] f / EPD = 2.22, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0167] FOV = 110.6°, where FOV is the maximum field of view angle of the optical imaging system.

[0168] T56 / CT4 = 1.08, where T56 is the air gap on the optical axis between the fifth lens and the sixth lens, and CT4 is the central thickness on the optical axis of the fourth lens.

[0169] f / f4 = 1.49, where f is the effective focal length of the optical imaging system, and f4 is the effective focal length of the fourth lens.

[0170] f234 / f2 = 0.48, where f234 is the combined focal length of the second, third, and fourth lenses, and f2 is the effective focal length of the second lens.

[0171] CT1 / (T12 + CT2) = 0.77, where CT1 is the central thickness on the optical axis of the first lens, T12 is the air gap on the optical axis between the first lens and the second lens, and CT2 is the central thickness on the optical axis of the second lens.

[0172] SAG32 / SAG31 = 1.02, where SAG32 is the axial distance between the intersection of the image side of the third lens and the optical axis and the vertex of the effective radius of the image side of the third lens, and SAG31 is the axial distance between the intersection of the object side of the third lens and the optical axis and the vertex of the effective radius of the object side of the third lens.

[0173] ET6 / SAG61 = -0.72, where ET6 is the edge thickness of the sixth lens, and SAG61 is the axial distance between the intersection of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens.

[0174] (ET4 - ET3) / ET3 = 0.51, where ET4 is the edge thickness of the fourth lens and ET3 is the edge thickness of the third lens.

[0175] |f / R5| = 0.67, where f is the effective focal length of the optical imaging system and R5 is the radius of curvature of the object side of the third lens.

[0176] |R9 / R10| = 0.31, where R9 is the radius of curvature of the object side of the fifth lens and R10 is the radius of curvature of the image side of the fifth lens.

[0177] |(R3 + R4) / (R3 - R4)| = 0.08, where R3 is the radius of curvature of the object side of the second lens and R4 is the radius of curvature of the image side of the second lens.

[0178] DT42 / R8 = -0.63, where DT42 is the effective semi-aperture of the image side of the fourth lens and R8 is the radius of curvature of the image side of the fourth lens.

[0179] DT21 / DT11 = 0.95, where DT21 is the effective semi-aperture of the object side of the second lens and DT11 is the effective semi-aperture of the object side of the first lens.

[0180] In Embodiment 4, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 12 shows the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 for each of the aspherical mirror surfaces S1 - S12 in Embodiment 4.

[0181]

[0182]

[0183] Table 12

[0184] Figure 8a shows the axial chromatic aberration curve of the optical imaging system of Embodiment 4, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 8b shows the astigmatism curve of the optical imaging system of Embodiment 4, which represents the meridional image plane curvature and the sagittal image plane curvature.Figure 8c The distortion curve of the optical imaging system of Embodiment 4 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 8d The longitudinal chromatic aberration curve of the optical imaging system of Embodiment 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. According to Figures 8a to 8d As can be seen from the figure, the optical imaging system given in Embodiment 4 can achieve good imaging quality. Specific Embodiment 5

[0186] Figure 9 The schematic structural diagram of the lens group of Embodiment 5 of the optical imaging system of the present invention is shown. The optical imaging system sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0187] The first lens E1 has a negative optical power. Its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a positive optical power. Its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has a negative optical power. Its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a positive optical power. Its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative optical power. Its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has a negative optical power. Its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S3 and an image side surface S14. The light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0188] As shown in Table 13, it is the basic parameter table of the optical imaging system of Embodiment 5, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0189]

[0190]

[0191] Table 13

[0192] As shown in Table 14, in Embodiment 5, the total effective focal length f of the optical imaging system is 2.82 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging system is 4.69 mm, and half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 2.60 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 55.0°.

[0193]

[0194] Table 14

[0195] The optical imaging system in Example 5 satisfies:

[0196] ImgH = 2.61. Here, ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

[0197] TTL / ImgH = 1.80, where TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

[0198] f / EPD = 2.22, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0199] FOV = 110.0°, where FOV is the maximum field of view angle of the optical imaging system.

[0200] T56 / CT4 = 0.68, where T56 is the air space on the optical axis between the fifth lens and the sixth lens, and CT4 is the central thickness on the optical axis of the fourth lens.

[0201] f / f4 = 1.47, where f is the effective focal length of the optical imaging system, and f4 is the effective focal length of the fourth lens.

[0202] f234 / f2 = 0.54, where f234 is the combined focal length of the second, third, and fourth lenses, and f2 is the effective focal length of the second lens.

[0203] CT1 / (T12 + CT2) = 0.33, where CT1 is the central thickness on the optical axis of the first lens, T12 is the air space on the optical axis between the first lens and the second lens, and CT2 is the central thickness on the optical axis of the second lens.

[0204] SAG32 / SAG31 = 0.21, where SAG32 is the on-axis distance between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens, and SAG31 is the on-axis distance between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens.

[0205] ET6 / SAG61 = -1.25, where ET6 is the edge thickness of the sixth lens, and SAG61 is the on-axis distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0206] (ET4 - ET3) / ET3 = 0.22, where ET4 is the edge thickness of the fourth lens, and ET3 is the edge thickness of the third lens.

[0207] |f / R5| = 0.43, where f is the effective focal length of the optical imaging system, and R5 is the radius of curvature of the object side surface of the third lens.

[0208] |R9 / R10| = 0.44, where R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0209] |(R3 + R4) / (R3 - R4)| = 0.30, where R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens.

[0210] DT42 / R8 = -0.83, where DT42 is the effective semi-aperture of the image side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0211] DT21 / DT11 = 0.70, where DT21 is the effective semi-aperture of the object side surface of the second lens, and DT11 is the effective semi-aperture of the object side surface of the first lens.

[0212] In Embodiment 5, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 15 shows the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 .

[0213]

[0214]

[0215] Table 15

[0216] Figure 10a shows the axial chromatic aberration curve of the optical imaging system of Embodiment 5, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 10b shows the astigmatism curve of the optical imaging system of Embodiment 5, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 10c shows the distortion curve of the optical imaging system of Embodiment 5, which represents the distortion magnitude values corresponding to different image heights. Figure 10d shows the lateral chromatic aberration curve of the optical imaging system of Embodiment 5, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 10a to 10d as shown, the optical imaging system given in Embodiment 5 can achieve good imaging quality. Specific Embodiment 6

[0218] Figure 11 This is a schematic diagram of the lens group structure of Embodiment 6 of the optical imaging system of the present invention. The optical imaging system sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0219] The first lens E1 has a negative focal power. Its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a positive focal power. Its object surface S3 is convex, and its image surface S4 is convex. The third lens E3 has a negative focal power. Its object surface S5 is concave, and its image surface S6 is convex. The fourth lens E4 has a positive focal power. Its object surface S7 is concave, and its image surface S8 is convex. The fifth lens E5 has a negative focal power. Its object surface S9 is concave, and its image surface S10 is concave. The sixth lens E6 has a negative focal power. Its object surface S11 is convex, and its image surface S12 is concave. The filter E7 has an object surface S3 and an image surface S14. Light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0220] As shown in Table 16, it is the basic parameter table of the optical imaging system of Embodiment 6. Among them, the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0221]

[0222]

[0223] Table 16

[0224] As shown in Table 17, in Embodiment 6, the total effective focal length f of the optical imaging system is 2.82 mm. The distance TTL on the optical axis from the object surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging system is 4.83 mm. Half of the diagonal length of the effective pixel region on the imaging surface S15 is ImgH = 2.60 mm. Half of the maximum field of view angle of the optical imaging lens is Semi-FOV = 46.2°.

[0225]

[0226] Table 17

[0227] The optical imaging system in Embodiment 6 satisfies:

[0228] ImgH = 2.61. Where ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

[0229] TTL / ImgH = 1.86, where TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0230] f / EPD = 2.22, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0231] FOV = 110.0°, where FOV is the maximum field of view angle of the optical imaging system.

[0232] T56 / CT4 = 0.70, where T56 is the air space on the optical axis between the fifth lens and the sixth lens, and CT4 is the central thickness on the optical axis of the fourth lens.

[0233] f / f4 = 0.48, where f is the effective focal length of the optical imaging system, and f4 is the effective focal length of the fourth lens.

[0234] f234 / f2 = 1.05, where f234 is the combined focal length of the second, third, and fourth lenses, and f2 is the effective focal length of the second lens.

[0235] CT1 / (T12 + CT2) = 0.59, where CT1 is the central thickness on the optical axis of the first lens, T12 is the air space on the optical axis between the first lens and the second lens, and CT2 is the central thickness on the optical axis of the second lens.

[0236] SAG32 / SAG31 = 0.39, where SAG32 is the on-axis distance between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens, and SAG31 is the on-axis distance between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens.

[0237] ET6 / SAG61 = -0.87, where ET6 is the edge thickness of the sixth lens, and SAG61 is the on-axis distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0238] (ET4 - ET3) / ET3 = 0.19, where ET4 is the edge thickness of the fourth lens, and ET3 is the edge thickness of the third lens.

[0239] |f / R5| = 0.59, where f is the effective focal length of the optical imaging system, and R5 is the radius of curvature of the object side surface of the third lens.

[0240] |R9 / R10| = 0.92, where R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0241] |(R3 + R4) / (R3 - R4)| = 0.36, where R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens.

[0242] DT42 / R8 = -0.48, where DT42 is the effective semi-aperture of the image side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0243] DT21 / DT11 = 0.67, where DT21 is the effective semi-aperture of the object side surface of the second lens, and DT11 is the effective semi-aperture of the object side surface of the first lens.

[0244] In Embodiment 6, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 18 shows the high-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 that can be used for each of the aspherical mirror surfaces S1 - S12 in Embodiment 6.

[0245] Face number A4 A6 A8 A10 A12 S1 1.1657E-01 -3.2592E-01 4.8850E-01 -5.8239E-01 4.5811E-01 S2 1.5187E-01 -1.1231E+00 7.6276E+00 -3.4176E+01 8.9764E+01 S3 -5.1424E-02 -1.4079E-01 5.6070E-01 -3.0109E+00 7.7898E+00 S4 -2.4393E-01 2.3270E-01 -1.1136E+00 1.2816E+00 2.2018E+00 S5 -2.9656E-01 1.1741E+00 -5.3415E+00 1.1074E+01 -1.2525E+01 S6 -2.6617E-01 1.4568E+00 -3.6437E+00 4.3297E+00 -2.6262E+00 S7 -1.6984E-01 2.5374E-01 1.5577E+00 -6.7574E+00 1.1980E+01 S8 4.6599E-02 -5.2358E-01 1.0645E+00 -1.0525E+00 4.9464E-01 S9 2.5249E-02 -2.9164E-01 5.0991E-01 -5.0339E-01 3.0498E-01 S10 -2.2243E-01 6.0547E-01 -9.6493E-01 8.8882E-01 -4.8937E-01 S11 -3.0296E-01 4.4908E-01 -1.0876E+00 1.3160E+00 -8.4252E-01 S12 5.6288E-01 -1.0921E+00 1.0852E+00 -6.9184E-01 2.9253E-01 Face number A14 A16 A18 A20 S1 -1.9130E-01 3.1991E-02 0.0000E+00 0.0000E+00 S2 -1.2328E+02 6.9994E+01 0.0000E+00 0.0000E+00 S3 -1.0683E+01 7.6301E+00 0.0000E+00 0.0000E+00 S4 -6.5342E+00 4.5064E+00 0.0000E+00 0.0000E+00 S5 8.0093E+00 -2.2616E+00 0.0000E+00 0.0000E+00 S6 7.6539E-01 -7.2270E-02 0.0000E+00 0.0000E+00 S7 -1.1797E+01 6.7609E+00 -2.1126E+00 2.7830E-01 S8 2.3456E-03 -1.1604E-01 4.8816E-02 -6.4787E-03 S9 -1.0523E-01 1.5209E-02 0.0000E+00 0.0000E+00 S10 1.5836E-01 -2.7808E-02 2.0453E-03 0.0000E+00 S11 3.0180E-01 -5.7534E-02 4.5594E-03 0.0000E+00 S12 -8.1301E-02 1.4227E-02 -1.4178E-03 6.1265E-05

[0246] Table 18

[0247] Figure 12a shows the axial chromatic aberration curve of the optical imaging system of Embodiment 6, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 12b shows the astigmatism curve of the optical imaging system of Embodiment 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12c shows the distortion curve of the optical imaging system of Embodiment 6, which represents the distortion magnitude values corresponding to different image heights. Figure 12d shows the lateral chromatic aberration curve of the optical imaging system of Embodiment 6, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 12a to 12d shown, the optical imaging system given in Embodiment 6 can achieve good imaging quality.

[0248] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, improvements, equivalent replacements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An optical imaging system, characterized in that, The number of lenses with optical power in the optical imaging system is six. The optical imaging system sequentially includes, from the object side to the image side along the optical axis: A first lens with negative optical power, whose image side is concave; A second lens with positive optical power, whose object side is convex and image side is convex; A third lens with negative optical power; A fourth lens with positive optical power, whose image side is convex; A fifth lens with negative optical power, whose object side is concave; and A sixth lens with negative optical power, whose image side is concave; Wherein, the maximum field of view angle FOV of the optical imaging system satisfies: 107.5° ≤ FOV ≤ 110.6°; the on-axis distance TTL from the object side of the first lens to the imaging surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy: 1.71 ≤ TTL / ImgH < 1.9; the air space T56 between the fifth lens and the sixth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis satisfy: 0.42 ≤ T56 / CT4 ≤ 1.21; The curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 0.21 ≤ |R9 / R10| ≤ 1.

04.

2. The optical imaging system according to claim 1, wherein: The effective focal length f of the optical imaging system and the effective focal length f4 of the fourth lens satisfy: 0.48 ≤ f / f4 ≤ 1.

49.

3. The optical imaging system according to claim 1, wherein: The combined focal length f234 of the second lens, the third lens, and the fourth lens and the effective focal length f2 of the second lens satisfy: 0.46 ≤ f234 / f2 ≤ 1.

05.

4. The optical imaging system according to claim 1, characterized in that: The central thickness CT1 of the first lens on the optical axis, the air space T12 between the first lens and the second lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 0.25 ≤ CT1 / (T12 + CT2) ≤ 0.

77.

5. The optical imaging system according to claim 1, wherein: The on-axis distance SAG32 between the intersection of the image side of the third lens and the optical axis and the vertex of the effective radius of the image side of the third lens and the on-axis distance SAG31 between the intersection of the object side of the third lens and the optical axis and the vertex of the effective radius of the object side of the third lens satisfy: 0.12 ≤ |SAG32 / SAG31| ≤ 1.

02.

6. The optical imaging system according to claim 1, characterized in that: The edge thickness ET6 of the sixth lens and the on-axis distance SAG61 between the intersection of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens satisfy: -1.25 ≤ ET6 / SAG61 ≤ -0.

69.

7. The optical imaging system according to claim 1, wherein: The edge thickness ET4 of the fourth lens and the edge thickness ET3 of the third lens satisfy: 0.02 ≤ |(ET4 - ET3) / ET3| ≤ 0.

51.

8. The optical imaging system according to claim 1, characterized in that: The effective focal length f of the optical imaging system and the curvature radius R5 of the object side of the third lens satisfy: 0.33 ≤ |f / R5| ≤ 0.

67.

9. The optical imaging system according to claim 1, wherein: The curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: 0.08 ≤ |(R3 + R4) / (R3 - R4)| ≤ 0.

36.

10. The optical imaging system according to claim 1, wherein: The effective semi-aperture DT42 of the image side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: -0.83 ≤ DT42 / R8 ≤ -0.

63.

11. The optical imaging system according to claim 1, wherein: The effective semi-aperture DT21 of the object side of the second lens and the effective semi-aperture DT11 of the object side of the first lens satisfy: 0.7 ≤ DT21 / DT11 ≤ 0.98.

Images