An optical imaging system

Abstract

The present invention discloses an optical imaging system, comprising: a prism configured to reflect light incident along a second optical axis direction and output the light along a first optical axis direction, wherein the first optical axis direction is perpendicular to the second optical axis direction; sequentially from the prism to the image side, including: a diaphragm; a first lens having a focal power; a second lens having a positive focal power; a third lens having a focal power, with a convex object side surface; a fourth lens having a focal power; a fifth lens having a focal power, with a convex object side surface and a convex image side surface; a sixth lens having a focal power, with a concave image side surface; and a seventh lens having a focal power; wherein, the F-number Fno of the optical imaging system satisfies: Fno ≤ 1.65; and half of the maximum field of view angle Semi-FOV of the optical imaging system satisfies: 20° < Semi-FOV < 30°. The optical imaging system provided by the present invention improves the imaging quality by changing the focal powers and lens morphologies of the respective lenses, without making the mobile phone too thick and can greatly increase the focal length to achieve telephoto.

Description

Technical Field

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

[0002] As is well known, on the premise of the beauty and thinness of smart phones, using a telescopic zoom lens will affect the thickness and reliability of the whole machine. Therefore, internal zoom is the best way for mobile phones to achieve optical zoom. Its structure is different from the traditional lens arrangement. The camera originally arranged vertically is horizontally arranged in the mobile phone, and a special optical prism that can move is used to refract light to achieve imaging. Such a design will neither make the mobile phone too thick nor can it greatly increase the focal length to achieve telephoto.

[0003] Therefore, an optical imaging system composed of seven lenses and one prism is needed, and the imaging quality of the optical system is improved by changing the optical power and lens morphology of each lens. Summary of the Invention

[0004] The present invention aims to provide an optical imaging system composed of seven lenses and one prism, which improves the imaging quality of the optical system by changing the optical power and lens morphology of each lens, neither making the mobile phone too thick nor greatly increasing the focal length to achieve telephoto.

[0005] One aspect of the present invention provides an optical imaging system, which includes: a prism configured such that light incident on the prism along the second optical axis direction is reflected and exits the prism along the first optical axis direction, where the first optical axis direction is perpendicular to the second optical axis direction.

[0006] The optical imaging system further sequentially includes, along the first optical axis direction from the prism to the image side: a diaphragm; a first lens having an optical power; a second lens having a positive optical power; a third lens having an optical power, whose object side is convex; a fourth lens having an optical power; a fifth lens having an optical power, whose object side is convex and image side is convex; a sixth lens having an optical power, whose image side is concave; and a seventh lens having an optical power.

[0007] Wherein, the F-number Fno of the optical imaging system satisfies: Fno ≤ 1.65.

[0008] According to an embodiment of the present invention, half of the maximum field of view angle Semi-FOV of the optical imaging system satisfies: 20° < Semi-FOV < 30°.

[0009] According to an embodiment of the present invention, the on-axis distance TTL from the object side of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy: TTL / f ≤ 1.16.

[0010] According to an embodiment of the present invention, for the semi-field of view (Semi-FOV) which is half of the maximum field of view of the optical imaging system and the effective focal length f of the optical imaging system, it satisfies: tan(Semi-FOV)×f < 4.5 mm.

[0011] According to an embodiment of the present invention, for the effective focal length f2 of the second lens and the effective focal length f of the optical imaging system, it satisfies: 0.6 < f2 / f < 1.

[0012] According to an embodiment of the present invention, for the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, and the effective focal length f3 of the third lens, it satisfies: 0.2 < ∣(R5 - R6) / f3∣ < 0.8.

[0013] According to an embodiment of the present invention, for 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, it satisfies: -0.5 < R9 / R10 < 0.

[0014] According to an embodiment of the present invention, for the effective focal length f of the optical imaging system, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R12 of the image side surface of the sixth lens, it satisfies: 0.2 < f / R11 + f / R12 < 1.2.

[0015] According to an embodiment of the present invention, for the edge thickness ET2 of the second lens at the maximum effective diameter and the central thickness CT2 of the second lens on the optical axis, it satisfies: ET2 / CT2 < 0.5.

[0016] According to an embodiment of the present invention, for the axial spacing distance SAG12 between the intersection point of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens, and the axial spacing distance SAG52 between the intersection point of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens, it satisfies: -2 < SAG12 / SAG52 < 0.

[0017] According to an embodiment of the present invention, for the air spacing T23 between the second lens and the third lens on the optical axis and the air spacing T34 between the third lens and the fourth lens on the optical axis, it satisfies: 0 < T23 / T34 < 0.4.

[0018] According to an embodiment of the present invention, for the half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging system and the entrance pupil diameter EPD, it satisfies: 0.5 < ImgH / EPD ≤ 0.79.

[0019] According to an embodiment of the present invention, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the air gap T67 between the sixth lens and the seventh lens on the optical axis, and the on-axis distance TTL from the object side surface of the first lens to the imaging surface satisfy: 0.1 < (T45 + T56 + T67) / TTL < 0.3.

[0020] Another aspect of the present invention provides an optical imaging system, which includes: a prism configured such that light incident on the prism along the second optical axis direction is reflected and exits the prism along the first optical axis direction, wherein the first optical axis direction is perpendicular to the second optical axis direction.

[0021] The optical imaging system further sequentially includes, along the first optical axis direction from the prism to the image side: a diaphragm; a first lens having a focal power; a second lens having a positive focal power; a third lens having a focal power with a convex object side surface; a fourth lens having a focal power; a fifth lens having a focal power with a convex object side surface and a convex image side surface; a sixth lens having a concave image side surface; and a seventh lens having a focal power.

[0022] Wherein, each lens is independent of each other, and there is an air gap between each lens on the optical axis; the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy: TTL / f ≤ 1.16.

[0023] Advantages of the present invention:

[0024] The optical imaging system provided by the present invention includes multiple lenses, such as the first lens to the seventh lens. The optical imaging system of the present invention improves the imaging quality of the optical system by changing the focal power and lens morphology of each lens, which neither makes the mobile phone very thick nor can significantly increase the focal length to achieve telephoto. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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 following drawings 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.

[0026] Figure 1 It is a schematic diagram of the lens group structure of Embodiment 1 of the optical imaging system of the present invention;

[0027] Figures 2a to 2d They are respectively the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of Embodiment 1 of the optical imaging system of the present invention;

[0028] Figure 3 Schematic diagram of the lens group structure of Embodiment 2 of the optical imaging system of the present invention;

[0029] 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;

[0030] Figure 5 Schematic diagram of the lens group structure of Embodiment 3 of the optical imaging system of the present invention;

[0031] 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;

[0032] Figure 7 Schematic diagram of the lens group structure of Embodiment 4 of the optical imaging system of the present invention;

[0033] 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;

[0034] Figure 9 Schematic diagram of the lens group structure of Embodiment 5 of the optical camera lens of the present invention;

[0035] Figures 10a to 10d Axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of Embodiment 5 of the optical camera lens of the present invention, respectively;

[0036] Figure 11 Schematic diagram of the lens group structure of Embodiment 6 of the optical camera lens of the present invention;

[0037] Figures 12a to 12d Axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of Embodiment 6 of the optical camera lens of the present invention, respectively;

[0038] Figure 13 Schematic diagram of the lens group structure of Embodiment 7 of the optical camera lens of the present invention;

[0039] Figures 14a to 14d Axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of Embodiment 7 of the optical camera lens of the present invention, respectively;

[0040] Figure 15 Schematic diagram of the lens group structure of Embodiment 8 of the optical camera lens of the present invention;

[0041] Figures 16a to 16d Axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of Embodiment 8 of the optical camera lens of the present invention, respectively. Detailed implementation mode

[0042] 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 of the embodiments of the present invention, rather than all the embodiments. 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.

[0043] 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 feature. 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.

[0044] It should also be understood that the terms "comprising", "including", "having", "containing" 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.

[0045] In the drawings, for the sake of convenience of illustration, the thickness, size and shape of the lens 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 only examples and are not drawn strictly to scale.

[0046] 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.

[0047] 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 a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal manner unless expressly so defined herein.

[0048] 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 drawings and in conjunction with the embodiments.

[0049] Exemplary Embodiment

[0050] The optical imaging system according to an exemplary embodiment of the present invention includes a prism and seven lenses. The prism is configured such that light incident on the prism in the second optical axis direction is reflected and exits the prism in the first optical axis direction, wherein the first optical axis direction is perpendicular to the second optical axis direction. The optical imaging system sequentially includes, along the first optical axis direction from the prism to the image side: a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein each lens is independent of each other, and there is an air gap on the optical axis between each pair of lenses.

[0051] In this exemplary embodiment, the first lens may have a positive or negative optical power; the second lens has a positive optical power; the third lens may have a positive or negative optical power, and its object side is convex; the fourth lens may have a positive or negative optical power; the fifth lens may have a positive or negative optical power, and its object side is convex and its image side is convex; the sixth lens may have a positive or negative optical power, and its image side is concave; the seventh lens may have a positive or negative optical power.

[0052] In this exemplary embodiment, the conditional formula satisfied by the F-number Fno of the optical imaging system is: Fno ≤ 1.65. Fno is an imaging brightness index of the optical imaging system. Controlling Fno below 1.65 is beneficial to obtaining a larger light input amount under the condition of the same focal length, improving the illuminance of the image plane and the response of the chip, thereby reducing the power consumption of the system. More specifically, Fno satisfies: 1 ≤ Fno ≤ 1.65. For example, 1.30 ≤ Fno ≤ 1.65.

[0053] In this exemplary embodiment, the conditional formula satisfied by the half of the maximum field of view angle Semi-FOV of the optical imaging system is: 20° < Semi-FOV < 30°. Controlling the range that the optical system can image is beneficial to expanding the obtained object-side information and ensuring that all the object-side information can be imaged on the chip. More specifically, Semi-FOV satisfies: 24° ≤ Semi-FOV ≤ 27°, for example, 24.30° ≤ Semi-FOV ≤ 26.93°.

[0054] In this exemplary embodiment, the conditional formula satisfied by the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging system is: TTL / f ≤ 1.16. Reasonably controlling the ratio of the on-axis distance from the object side surface of the first lens of the optical imaging lens to the imaging surface to the effective focal length of the optical imaging system can ensure the reasonable focal length and total lens length characteristics of the optical system, which is beneficial to the small depth of field, high magnification, and miniaturization of the imaging lens. More specifically, TTL and f satisfy: 1 ≤ TTL / f ≤ 1.16, for example, 1.10 ≤ TTL / f ≤ 1.16.

[0055] In this exemplary embodiment, the conditional formula satisfied by the half of the maximum field of view angle Semi-FOV of the optical imaging system and the effective focal length f of the optical imaging system is: tan(Semi-FOV) × f < 4.5 mm. Reasonably configuring the half field of view angle and focal length of the optical system can accurately obtain the image height of the optical system while ensuring the field of view angle and focal length of the optical system, thereby reasonably matching the chip. More specifically, Semi-FOV and f satisfy: 4.1 mm < tan(Semi-FOV) × f < 4.45 mm, for example, 4.12 mm ≤ tan(Semi-FOV) × f ≤ 4.44 mm.

[0056] In this exemplary embodiment, the conditional formula satisfied by the effective focal length f2 of the second lens and the effective focal length f of the optical imaging system is: 0.6 < f2 / f < 1. Reasonably configuring the optical power and effective focal length of the second lens is beneficial to achieving a large object-side field of view and correcting off-axis aberrations of the lens group, thereby improving the imaging quality of the lens. More specifically, f2 and f satisfy: 0.7 < f2 / f < 0.95, for example, 0.74 ≤ f2 / f ≤ 0.90.

[0057] In this exemplary embodiment, the conditional expression satisfied by the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, and the effective focal length f3 of the third lens is: 0.2 < |(R5 - R6) / f3| < 0.8. Reasonably controlling the ratio of the difference between the radius of curvature of the object side surface and the image side surface of the third lens to the effective focal length of the third lens can effectively control the radii of curvature of the object side surface and the image side surface of the third lens, thereby effectively reducing axial chromatic aberration, correcting the astigmatism and field curvature of the lens, ensuring the matching of the chief ray angle (CRA) of the lens, and ensuring good imaging quality. More specifically, R5, R6, and f3 satisfy: 0.4 < |(R5 - R6) / f3| < 0.7. For example, 0.48 ≤ |(R5 - R6) / f3| ≤ 0.66.

[0058] In this exemplary embodiment, the conditional expression satisfied by 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 is: -0.5 < R9 / R10 < 0. Reasonably controlling the ratio of the radius of curvature of the object side surface to the radius of curvature of the image side surface of the fifth lens can effectively control the optical power of the fifth lens and also control its surface shape, ensuring the effective incidence of marginal rays, thereby improving the illuminance of the system and ensuring the imaging quality of the optical system. More specifically, R9 and R10 satisfy: -0.4 < R9 / R10 < -0.05. For example, -0.38 ≤ R9 / R10 ≤ -0.06.

[0059] In this exemplary embodiment, the conditional expression satisfied by the effective focal length f of the optical imaging system, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R12 of the image side surface of the sixth lens is: 0.2 < f / R11 + f / R12 < 1.2. Reasonably controlling the ratio of the effective focal length to the radii of curvature of the object side surface and the image side surface of the sixth lens can eliminate the spherical aberration of the optical system and ensure the imaging quality of the optical system. More specifically, f, R11, and R12 satisfy: 0.4 < f / R11 + f / R12 < 1. For example, 0.48 ≤ f / R11 + f / R12 ≤ 0.97.

[0060] In this exemplary embodiment, the conditional expression satisfied by the edge thickness ET2 of the second lens at the maximum effective diameter and the central thickness CT2 of the second lens on the optical axis is: ET2 / CT2 < 0.5. Reasonably distributing the edge thickness of the second lens at the maximum effective diameter and the central thickness on the optical axis makes the lens easy to injection mold, improves the processability of the imaging system, and at the same time ensures good imaging quality. More specifically, ET2 and CT2 satisfy: 0.1 < ET2 / CT2 < 0.45. For example, 0.15 ≤ ET2 / CT2 ≤ 0.41.

[0061] In this exemplary embodiment, the conditional formula satisfied by the axial interval distance SAG12 between the intersection of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens and the axial interval distance SAG52 between the intersection of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens is: -2 < SAG12 / SAG52 < 0. By reasonably controlling the surface shapes of each surface of the first lens and the fifth lens, the total internal reflection of light at this surface can be reduced, and the light can be better converged on the image plane, thereby facilitating the correction of spherical aberration and coma of the optical system; on the other hand, by reasonably controlling the surface shapes of each surface of the first lens and the fifth lens, the yield of the optical lens can be improved. More specifically, SAG12 and SAG52 satisfy: -1.6 < SAG12 / SAG52 < -0.7. For example, -1.58 ≤ SAG12 / SAG52 ≤ -0.79.

[0062] In this exemplary embodiment, the conditional formula satisfied by the air interval T23 between the second lens and the third lens on the optical axis and the air interval T34 between the third lens and the fourth lens on the optical axis is: 0 < T23 / T34 < 0.4. By reasonably configuring the air intervals between the lenses, the sensitivity of the air gap thickness of the lens can be effectively reduced, and the field curvature can be corrected. More specifically, T23 and T34 satisfy: 0.1 < T23 / T34 < 0.3. For example, 0.11 ≤ T23 / T34 ≤ 0.27.

[0063] In this exemplary embodiment, the conditional formula satisfied by half of the diagonal length ImgH of the effective pixel region on the imaging plane of the optical imaging system and the entrance pupil diameter EPD is: 0.5 < ImgH / EPD ≤ 0.79. By reasonably controlling the ratio of the image height of the optical system to the entrance pupil diameter, the object space field angle of the system and the number of light rays entering the optical system can be effectively shared, thereby improving the illuminance of the optical system and enhancing the imaging quality of the system. More specifically, ImgH and EPD satisfy: 0.55 < ImgH / EPD ≤ 0.79. For example, 0.60 ≤ ImgH / EPD ≤ 0.79.

[0064] In this exemplary embodiment, the conditional formula satisfied by the air interval T45 between the fourth lens and the fifth lens on the optical axis, the air interval T56 between the fifth lens and the sixth lens on the optical axis, the air interval T67 between the sixth lens and the seventh lens on the optical axis, and the axial distance TTL from the object side of the first lens to the imaging plane is: 0.1 < (T45 + T56 + T67) / TTL < 0.3. By reasonably configuring the air intervals between the fourth, fifth, and sixth lenses and the total length of the system, the air thickness sensitivity of each lens can be effectively reduced, and the field curvature can be corrected. More specifically, T45, T56, T67, and TTL satisfy: 0.15 < (T45 + T56 + T67) / TTL < 0.25. For example, 0.17 ≤ (T45 + T56 + T67) / TTL ≤ 0.23.

[0065] In this exemplary embodiment, the above optical imaging system may further include a diaphragm. The diaphragm can be disposed at an appropriate position as needed. For example, the diaphragm can be disposed 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.

[0066] The optical imaging system according to the above embodiment of the present invention may employ multiple lenses, such as the seven lenses described above. By reasonably allocating the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, etc., the optical imaging system has a relatively 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.

[0067] In an exemplary embodiment, at least one of the lens surfaces of each lens is an aspherical surface, that is, at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical surface. The characteristics of an aspherical 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 aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate as much as possible the aberration that appears during imaging, 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, the sixth lens, and the seventh lens is an aspherical 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, the sixth lens, and the seventh lens are aspherical surfaces.

[0068] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present 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 seven lenses are described as an example in the embodiment, the optical imaging system is not limited to including seven lenses. If necessary, the optical imaging system may further include other numbers of lenses.

[0069] 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

[0071] Figure 1Schematic diagram of the lens group structure of Embodiment 1 of the optical imaging system of the present invention. The optical imaging system sequentially includes, from the object side to the image side along the first optical axis direction: a prism EO, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0072] The prism EO has a light incident surface, a light reflecting surface, and a light exiting surface. The first lens E1 has a positive 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 concave. 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 concave. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. 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 seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces from the light incident surface of the prism EO to S16 and finally forms an image on the imaging surface S17.

[0073] 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).

[0074] Surface number Surface type Radius of curvature Thickness / distance Focal length Refractive index Dispersion coefficient Conic coefficient OBJ Spherical surface Infinity Infinity Spherical surface Infinity 3.4000 1.91 31.32 Spherical surface Infinity 3.4000 1.91 31.32 Spherical surface Infinity 2.3932 STO Spherical surface Infinity -1.6060 S1 Aspherical surface 4.0492 1.4521 15.08 1.55 55.82 -0.3755 S2 Aspherical surface 6.9591 0.0446 0.1030 S3 Aspherical surface 4.2736 1.5000 8.18 1.55 55.82 0.0117 S4 Aspherical surface 86.8314 0.1247 2.8318 S5 Aspherical surface 8.7452 0.4488 -8.22 1.68 19.24 3.5195 S6 Aspherical surface 3.3317 0.7931 -0.0453 S7 Aspherical surface 5.1451 0.4907 641.90 1.55 55.82 -0.5776 S8 Aspherical surface 5.0458 0.7411 0.2894 S9 Aspherical surface 20.5304 0.6678 28.62 1.68 19.24 -56.1602 S10 Aspherical surface -345.4738 0.8709 -90.0000 S11 Aspherical surface 45.5582 0.9129 -172.11 1.68 19.24 39.0000 S12 Aspherical surface 32.4944 0.5281 -90.0000 S13 Aspherical surface -24.8289 0.5000 -11.36 1.55 55.82 46.3954 S14 Aspherical surface 8.3257 0.1435 0.6846 S15 Spherical surface Infinity 0.2100 1.52 64.17 S16 Spherical surface Infinity 0.5615 S17 Spherical surface Infinity Infinity

[0075] Table 1

[0076] As shown in Table 2, in Embodiment 1, the total effective focal length f of the optical imaging system is 9.12 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 is 9.99 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 is ImgH = 4.20 mm, and half of the maximum field of view angle of the optical imaging system is Semi - FOV = 24.30°.

[0077]

[0078]

[0079] Table 2

[0080] The optical imaging system in Embodiment 1 satisfies:

[0081] Fno = 1.30, where Fno is the F - number of the optical imaging system;

[0082] Semi-FOV = 24.30°, where Semi-FOV is half of the maximum field of view angle of the optical imaging system;

[0083] TTL / f = 1.10, where TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, and f is the effective focal length of the optical imaging system;

[0084] tan(Semi-FOV) × f = 4.12 mm, where Semi-FOV is half of the maximum field of view angle of the optical imaging system, and f is the effective focal length of the optical imaging system;

[0085] f2 / f = 0.90, where f2 is the effective focal length of the second lens, and f is the effective focal length of the optical imaging system;

[0086] ∣(R5 - R6) / f3∣ = 0.66, where R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, and f3 is the effective focal length of the third lens;

[0087] R9 / R10 = -0.06, where R9 is the curvature radius of the object side surface of the fifth lens, and R10 is the curvature radius of the image side surface of the fifth lens;

[0088] f / R11 + f / R12 = 0.48, where f is the effective focal length of the optical imaging system, R11 is the curvature radius of the object side surface of the sixth lens, and R12 is the curvature radius of the image side surface of the sixth lens;

[0089] ET2 / CT2 = 0.22, where ET2 is the edge thickness of the second lens at the maximum effective diameter, and CT2 is the central thickness of the second lens on the optical axis;

[0090] SAG12 / SAG52 = -1.17, where SAG12 is the on-axis interval distance between the intersection of the image side surface of the first lens and the optical axis and the vertex of the effective radius of the image side surface of the first lens, and SAG52 is the on-axis interval distance between the intersection of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens;

[0091] T23 / T34 = 0.16, where T23 is the air interval between the second lens and the third lens on the optical axis, and T34 is the air interval between the third lens and the fourth lens on the optical axis;

[0092] ImgH / EPD = 0.60, where ImgH is half of the diagonal length of the effective pixel region on the imaging surface of the optical imaging system, and EPD is the entrance pupil diameter;

[0093] (T45 + T56 + T67) / TTL = 0.21, where T45 is the air gap between the fourth lens and the fifth lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, T67 is the air gap between the sixth lens and the seventh lens on the optical axis, and TTL is the axial distance from the object side of the first lens to the imaging surface.

[0094] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0095]

[0096] where x is the sagitta of the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface.

[0097] In Embodiment 1, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 3 shows the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 for each of the aspherical mirror surfaces S1 - S14 in Embodiment 1.

[0098] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -1.0439E-01 -1.0065E-01 -4.2457E-02 -1.3722E-02 -3.2725E-03 -7.6754E-04 -2.7377E-04 S2 -4.0452E-01 -5.9343E-02 -3.3205E-02 1.0238E-03 -2.2047E-03 1.4299E-04 3.3820E-06 S3 -3.8887E-01 -5.5789E-02 -3.4615E-02 -3.1228E-04 -6.4307E-05 1.7143E-03 1.2710E-03 S4 -9.6420E-02 2.6768E-03 -1.6247E-02 5.1944E-03 -1.9686E-03 1.4992E-03 -7.0288E-04 S5 -2.5550E-01 8.8251E-02 -1.3095E-02 9.0302E-03 -1.0352E-03 1.5230E-03 -6.9517E-04 S6 -9.6996E-02 3.8768E-02 -3.1754E-03 -5.2143E-04 -1.1019E-03 1.0791E-04 3.0627E-05 S7 -1.1282E-02 3.5860E-02 7.7865E-03 1.5410E-03 2.1782E-04 1.4062E-04 6.9704E-05 S8 -6.6847E-02 1.2978E-02 2.3799E-03 6.4346E-04 4.5743E-05 1.6856E-05 5.7611E-06 S9 -2.8520E-01 -2.5820E-02 -3.8066E-03 -2.5996E-04 -1.0240E-04 -2.1416E-05 -4.5408E-06 S10 -4.7081E-01 -1.1589E-02 2.3745E-03 2.4346E-03 7.0473E-04 4.4735E-04 1.9945E-04 S11 -1.0883E+00 8.2160E-02 3.3109E-02 1.6123E-02 7.4903E-03 1.7477E-03 -3.1612E-03 S12 -1.3606E+00 1.2178E-01 -2.4465E-02 4.3511E-03 2.8803E-03 5.6116E-03 2.8989E-03 S13 -1.2597E+00 4.8861E-01 -9.0287E-02 5.1077E-02 -2.0454E-02 2.8464E-03 9.5269E-04 S14 -2.2115E+00 3.4689E-01 -7.9280E-02 7.6231E-02 -1.3923E-02 3.0766E-03 -1.9719E-03 Surface number A18 A20 A22 A24 A26 A28 A30 S1 -1.8258E-04 -1.1193E-04 -4.9584E-05 -1.4912E-05 0.0000E+00 0.0000E+00 0.0000E+00 S2 1.3117E-05 1.3164E-04 4.3766E-05 4.0886E-05 0.0000E+00 0.0000E+00 0.0000E+00 S3 4.7224E-04 1.9121E-04 2.2333E-05 1.6606E-05 0.0000E+00 0.0000E+00 0.0000E+00 S4 1.3056E-04 -1.5775E-04 8.8628E-06 -2.1928E-05 0.0000E+00 0.0000E+00 0.0000E+00 S5 7.2882E-05 -9.8881E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 3.9607E-05 1.3358E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 2.4338E-05 1.3097E-05 4.8666E-06 4.7649E-06 0.0000E+00 0.0000E+00 0.0000E+00 S8 1.6981E-06 1.1336E-06 -6.3542E-07 2.6512E-07 0.0000E+00 0.0000E+00 0.0000E+00 S9 -1.7020E-06 1.3433E-06 2.9985E-07 5.1776E-07 -8.9906E-07 0.0000E+00 0.0000E+00 S10 9.1676E-05 3.4968E-05 1.4982E-05 4.4406E-06 2.4299E-06 0.0000E+00 0.0000E+00 S11 -3.6378E-03 -1.9869E-03 -5.2176E-04 8.8013E-05 1.9631E-04 1.1612E-04 3.1580E-05 S12 8.4235E-04 -5.6828E-05 -4.2469E-05 -1.0596E-04 -3.3781E-05 1.0150E-05 6.2842E-06 S13 -6.6036E-04 -5.5188E-04 7.4133E-06 -6.0295E-05 1.2952E-04 8.5018E-06 -6.7676E-05 S14 -1.6807E-04 -3.2957E-04 3.1057E-05 -3.4302E-04 -1.9122E-04 -1.2335E-04 -8.6865E-05

[0099] Table 3

[0100] 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 with different wavelengths after passing through the lens. Figure 2b shows the astigmatism curve of the optical imaging lens of Embodiment 1, which represents the meridional image plane curvature and the sagittal image plane curvature. 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 on the imaging surface after the light rays pass through the lens. According to Figures 2a to 2dAs can be seen, the optical imaging system given in Embodiment 1 can achieve good imaging quality. Specific Embodiment 2

[0102] Figure 3 FIG. is a schematic structural diagram of a lens group according to Embodiment 2 of the optical imaging system of the present invention. The optical imaging system sequentially includes, from the object side to the image side along the first optical axis direction: a prism EO, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0103] The prism EO has a light incident surface, a light reflecting surface, and a light exiting surface. The first lens E1 has a positive 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 negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. 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 seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces from the light incident surface of the prism EO to S16 and finally forms an image on the imaging surface S17.

[0104] As shown in Table 4, it is a 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).

[0105]

[0106]

[0107] Table 4

[0108] As shown in Table 5, in Embodiment 2, the total effective focal length f of the optical imaging system is 8.85 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 is 9.90 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 is ImgH = 4.20 mm, and half of the maximum field of view angle of the optical imaging system is Semi - FOV = 24.94°. The parameters of each relationship are as explained in the first embodiment, and the values of each relationship are listed in the following table.

[0109]

[0110] Table 5

[0111] In Embodiment 2, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 6 shows the high-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 , and A 30 .

[0112]

[0113]

[0114] Table 6

[0115] Figure 4a shows the axial chromatic aberration curve of the optical imaging system of Embodiment 2, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 4b shows the astigmatism curve of the optical imaging lens of Embodiment 2, which represents the meridional image plane curvature and the sagittal image plane curvature. 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 lateral 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

[0117] Figure 5 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, from the object side to the image side along the first optical axis direction: a prism EO, a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0118] The prism EO has a light incident surface, a light reflecting surface, and a light exiting surface. The first lens E1 has a positive 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 concave. 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 negative optical power, its object side S7 is convex, and its image side S8 is concave. The fifth lens E5 has a positive optical power, its object side S9 is convex, and its image side S10 is convex. The sixth lens E6 has a positive optical power, its object side S11 is convex, and its image side S12 is concave. The seventh lens E7 has a negative optical power, its object side S13 is convex, and its image side S14 is concave. The filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the surfaces from the light incident surface of the prism EO to S16 and finally forms an image on the imaging surface S17.

[0119] As shown in Table 7, it is the basic parameter table of the optical imaging system of Example 3, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0120] Surface number Surface type Radius of curvature Thickness / distance Focal length Refractive index Dispersion coefficient Conic coefficient OBJ Spherical surface Infinity Infinity Spherical surface Infinity 3.4000 1.91 31.32 Spherical surface Infinity 3.4000 1.91 31.32 Spherical surface Infinity 2.3932 STO Spherical surface Infinity -1.6060 S1 Aspherical surface 3.7937 0.9816 18.64 1.55 55.82 -0.4453 S2 Aspherical surface 5.4969 0.5385 -0.1630 S3 Aspherical surface 3.7261 1.3389 6.87 1.55 55.82 0.0250 S4 Aspherical surface 467.0784 0.0893 90.0000 S5 Aspherical surface 7.2588 0.4400 -8.56 1.68 19.24 3.3371 S6 Aspherical surface 3.1448 0.8060 0.0000 S7 Aspherical surface 4.9132 0.4500 -52.27 1.55 55.82 -2.6824 S8 Aspherical surface 4.1550 0.6575 -0.2442 S9 Aspherical surface 17.5097 0.9896 23.53 1.68 19.24 -90.0000 S10 Aspherical surface -174.3248 0.4420 90.0000 S11 Aspherical surface 16.9443 1.1588 194.39 1.68 19.24 39.0000 S12 Aspherical surface 18.9090 0.5819 26.4090 S13 Aspherical surface 91.8089 0.4570 -10.81 1.55 55.82 46.3954 S14 Aspherical surface 5.5336 0.1696 -1.0146 S15 Spherical surface Infinity 0.2100 1.52 64.17 S16 Spherical surface Infinity 0.5893 S17 Spherical surface Infinity Infinity

[0121] Table 7

[0122] As shown in Table 8, in Example 3, the total effective focal length f of the optical imaging system is 8.54 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 is 9.90 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH = 4.20 mm, and half of the maximum field of view angle of the optical imaging system is Semi-FOV = 25.74°. The parameters of each relationship are as explained in the first embodiment, and the values of each relationship are listed in the following table.

[0123]

[0124] Table 8

[0125] In Example 3, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 9 shows the high-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 that can be used for the aspherical surfaces S1 - S14 in Example 3.

[0126] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -1.3333E-01 -8.4010E-02 -3.7254E-02 -1.0561E-02 -1.3602E-04 2.1966E-03 1.6468E-03 S2 -4.3700E-01 -7.9769E-02 -2.9685E-02 9.6962E-03 8.9764E-03 -3.4185E-04 -4.9488E-03 S3 -3.8372E-01 -4.6524E-02 -5.3794E-02 -1.2919E-02 6.0981E-03 5.8364E-03 1.8042E-03 S4 -2.8086E-02 -4.5726E-04 -1.9302E-02 4.5545E-03 3.2983E-03 -2.4186E-03 1.3388E-03 S5 -2.5099E-01 7.1472E-02 5.2398E-03 3.5563E-03 2.3070E-03 -1.9886E-04 4.4278E-04 S6 -2.5648E-02 9.7872E-03 1.2495E-03 1.0073E-04 5.7684E-05 6.1543E-06 5.2313E-06 S7 -5.4190E-02 3.1277E-02 2.6856E-03 3.5259E-04 -1.0178E-04 -2.3773E-04 -2.5145E-04 S8 -8.4944E-02 1.3664E-02 4.4365E-04 3.1193E-05 -1.7698E-05 2.0068E-06 -2.8743E-07 S9 -8.3198E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 -4.4738E-01 7.3443E-03 -7.9502E-03 -7.0906E-04 0.0000E+00 0.0000E+00 0.0000E+00 S11 -1.3488E+00 1.1431E-02 1.8361E-02 1.7609E-02 1.1359E-02 1.4240E-03 -4.1860E-03 S12 -1.2799E+00 4.3499E-02 -3.1686E-04 -6.0118E-03 6.8138E-04 -5.2894E-03 -5.2231E-03 S13 -1.1629E+00 3.5994E-01 -6.1704E-02 3.2781E-02 -7.5820E-03 -2.3359E-03 -7.2208E-03 S14 -2.3475E+00 3.5567E-01 -7.1954E-02 4.7633E-02 -9.0712E-04 7.2600E-03 -2.7260E-03 Surface number A18 A20 A22 A24 A26 A28 A30 S1 7.8103E-04 2.5596E-04 4.8676E-05 -2.3286E-06 0.0000E+00 0.0000E+00 0.0000E+00 S2 -4.3953E-03 -2.3483E-03 -8.2663E-04 -1.6173E-04 0.0000E+00 0.0000E+00 0.0000E+00 S3 3.3379E-04 2.8088E-04 2.4722E-04 8.3567E-05 0.0000E+00 0.0000E+00 0.0000E+00 S4 5.2872E-04 7.7038E-05 -4.7632E-04 -2.7110E-05 0.0000E+00 0.0000E+00 0.0000E+00 S5 -9.2734E-05 2.9552E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -6.1618E-07 1.6448E-06 -1.7635E-06 4.8166E-07 5.0664E-08 -2.3673E-08 0.0000E+00 S7 -1.7966E-04 -1.0145E-04 -4.3211E-05 -1.1469E-05 0.0000E+00 0.0000E+00 0.0000E+00 S8 8.6615E-07 -1.3425E-06 1.1607E-06 -2.3966E-07 0.0000E+00 0.0000E+00 0.0000E+00 S9 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -5.9172E-03 -5.1594E-03 -3.2899E-03 -1.5875E-03 -5.3755E-04 -9.3032E-05 1.1206E-05 S12 -4.1569E-03 -3.2214E-03 -2.5512E-03 -2.0543E-03 -1.2797E-03 -4.3873E-04 -6.4012E-05 S13 -2.2029E-03 -9.7603E-04 1.7099E-04 -1.5349E-04 -6.6439E-04 -4.8269E-04 -8.3782E-05 S14 -1.1458E-03 -2.4003E-03 -1.2655E-03 -5.8368E-04 -4.6061E-06 1.1866E-05 8.7755E-05

[0127] Table 9

[0128] 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 camera lens of Embodiment 3, which represents the curvature of the meridional image plane and 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, the optical imaging system given in Embodiment 3 can achieve good imaging quality. Specific Embodiment 4

[0130] 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, from the object side to the image side along the first optical axis direction: a prism EO, a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0131] The prism EO has a light incident surface, a light reflecting surface, and a light exiting surface. The first lens E1 has a positive 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 negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces from the light incident surface of the prism EO to S16 and finally forms an image on the imaging surface S17.

[0132] As shown in Table 10, it is the basic parameter table of the optical imaging system of Embodiment 4, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0133] Surface number Surface type Radius of curvature Thickness / distance Focal length Refractive index Dispersion coefficient Conic coefficient OBJ Spherical surface Infinity Infinity Spherical surface Infinity 3.4000 1.91 31.32 Spherical surface Infinity 3.4000 1.91 31.32 Spherical surface Infinity 2.3932 STO Spherical surface Infinity -1.6060 S1 Aspherical surface 3.8032 0.9422 19.69 1.55 55.82 -0.4316 S2 Aspherical surface 5.3705 0.6361 0.0027 S3 Aspherical surface 3.6320 1.3761 6.53 1.55 55.82 0.0125 S4 Aspherical surface -173.6822 0.1582 -81.6701 S5 Aspherical surface 7.7014 0.4400 -7.97 1.68 19.24 2.9768 S6 Aspherical surface 3.1021 0.6347 0.3278 S7 Aspherical surface 4.8693 0.3500 -48.51 1.55 55.82 -1.8153 S8 Aspherical surface 4.1178 0.8040 0.2710 S9 Aspherical surface 17.1592 1.0362 20.47 1.68 19.24 -90.0000 S10 Aspherical surface -70.5314 0.5953 -85.5723 S11 Aspherical surface 18.8249 1.0191 954.75 1.68 19.24 39.0000 S12 Aspherical surface 18.9652 0.5887 29.0788 S13 Aspherical surface -27.5021 0.3205 -10.20 1.55 55.82 46.3954 S14 Aspherical surface 7.0117 0.1846 -0.6865 S15 Spherical surface Infinity 0.2100 1.52 64.17 S16 Spherical surface Infinity 0.6042 S17 Spherical surface Infinity Infinity

[0134] Table 10

[0135] As shown in Table 11, in Embodiment 4, the total effective focal length f of the optical imaging system is 8.72 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 is 9.90 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 is ImgH = 4.20 mm, and half of the maximum field of view angle of the optical imaging system is Semi-FOV = 25.29°. The parameters of each relationship are as explained in the first embodiment, and the values of each relationship are listed in the following table.

[0136]

[0137] Table 11

[0138] In Embodiment 4, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 12 shows the higher-order coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 that can be used for each aspherical mirror surface S1 - S14 in Embodiment 4.

[0139]

[0140]

[0141] Table 12

[0142] 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 lens of Embodiment 4, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 8c shows the distortion curve of the optical imaging system of Embodiment 4, which represents the distortion magnitude values corresponding to different image heights. Figure 8d shows the longitudinal chromatic aberration curve of the optical imaging system of Embodiment 4, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. It can be seen from Figures 8a to 8d that the optical imaging system given in Embodiment 4 can achieve good imaging quality. Specific Embodiment 5

[0144] Figure 9Schematic diagram of the lens group structure of Embodiment 5 of the optical imaging system of the present invention. The optical imaging system sequentially includes, from the object side to the image side along the first optical axis direction: a prism EO, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0145] The prism EO has a light incident surface, a light reflecting surface, and a light exiting surface. The first lens E1 has a positive 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 negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces from the light incident surface of the prism EO to S16 and finally forms an image on the imaging surface S17.

[0146] 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).

[0147]

[0148]

[0149] Table 13

[0150] As shown in Table 14, in Embodiment 5, the total effective focal length f of the optical imaging system is 8.74 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 is 9.90 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 is ImgH = 4.20 mm, and half of the maximum field of view angle of the optical imaging system is Semi - FOV = 26.93°. The parameters of each relationship are as explained in the first embodiment, and the values of each relationship are listed in the following table.

[0151]

[0152] Table 14

[0153] In Embodiment 5, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 15 shows the higher-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0154]

[0155]

[0156] Table 15

[0157] 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 with 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 longitudinal chromatic aberration curve of the optical imaging system of Embodiment 5, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 10a to 10d shown, the optical imaging system given in Embodiment 5 can achieve good imaging quality. Specific Embodiment 6

[0159] Figure 11 is a schematic structural diagram of the lens group of Embodiment 6 of the optical imaging system of the present invention. The optical imaging system sequentially includes, from the object side to the image side along the first optical axis direction: a prism EO, a diaphragm STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0160] The prism EO has a light incident surface, a light reflecting surface, and a light exiting surface. The first lens E1 has a positive 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 negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces from the light incident surface of the prism EO to S16 and finally forms an image on the imaging surface S17.

[0161] As shown in Table 16, it is the basic parameter table of the optical imaging system of Example 6, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0162] Surface number Surface type Radius of curvature Thickness / distance Focal length Refractive index Dispersion coefficient Conic coefficient OBJ Spherical surface Infinity Infinity Spherical surface Infinity 3.4000 1.91 31.32 Spherical surface Infinity 3.4000 1.91 31.32 Spherical surface Infinity 2.3932 STO Spherical surface Infinity -1.6060 S1 Aspherical surface 3.8060 0.9364 19.64 1.55 55.82 -0.4309 S2 Aspherical surface 5.3881 0.6175 0.0010 S3 Aspherical surface 3.6515 1.3759 6.56 1.55 55.82 0.0136 S4 Aspherical surface -158.8447 0.1604 19.8689 S5 Aspherical surface 7.7129 0.4401 -7.97 1.68 19.24 2.9758 S6 Aspherical surface 3.1038 0.6227 0.3331 S7 Aspherical surface 4.8839 0.3500 -48.62 1.55 55.82 -1.8035 S8 Aspherical surface 4.1302 0.8281 0.2648 S9 Aspherical surface 16.6776 1.0199 20.19 1.68 19.24 -90.0000 S10 Aspherical surface -74.2282 0.5913 90.0000 S11 Aspherical surface 19.3329 1.0420 6574.57 1.68 19.24 39.0000 S12 Aspherical surface 18.9944 0.5907 29.0337 S13 Aspherical surface -27.7290 0.3200 -10.27 1.55 55.82 46.3954 S14 Aspherical surface 7.0550 0.1877 -0.7286 S15 Spherical surface Infinity 0.2100 1.52 64.17 S16 Spherical surface Infinity 0.6073 S17 Spherical surface Infinity Infinity

[0163] Table 16

[0164] As shown in Table 17, in Example 6, the total effective focal length f of the optical imaging system is 8.74 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 is 9.90 mm, half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH = 4.20 mm, and half of the maximum field of view angle of the optical imaging system is Semi - FOV = 25.23°. The parameters of each relationship are as explained in the first embodiment, and the values of each relationship are listed in the following table.

[0165]

[0166]

[0167] Table 17

[0168] In Example 6, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 18 shows the higher - order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26, A 28 and A 30 .

[0169] Surface number A4 A6 A8 A10 A12 A14 A16 S1 -1.2611E-01 -9.0224E-02 -3.9861E-02 -7.7390E-03 2.5593E-03 2.0298E-03 -1.8650E-04 S2 -4.1226E-01 -7.8288E-02 -2.4127E-02 1.0436E-02 2.7134E-03 -5.3286E-03 -3.1445E-03 S3 -3.8574E-01 -4.6639E-02 -5.2796E-02 -1.1456E-02 5.6744E-03 4.1912E-03 1.7564E-03 S4 -4.0736E-02 5.4286E-03 -2.7251E-02 8.8218E-03 1.9028E-03 -2.1793E-03 8.6772E-04 S5 -2.6268E-01 7.7133E-02 8.5469E-03 2.0461E-03 -4.6926E-04 7.8015E-04 1.4925E-03 S6 -5.4682E-02 4.0883E-02 8.0044E-03 -8.0928E-04 -2.9377E-03 -2.2557E-03 -1.0750E-03 S7 -3.5989E-02 2.7530E-02 -2.4745E-03 1.2568E-05 5.5932E-04 3.9769E-04 1.6786E-04 S8 -6.9396E-02 1.6495E-02 -3.4541E-04 -1.3369E-04 -5.2996E-05 -7.8212E-06 -7.1171E-07 S9 -5.0150E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 -2.9681E-01 1.9898E-03 -3.8151E-03 -4.1136E-04 -3.6600E-05 0.0000E+00 0.0000E+00 S11 -1.3973E+00 -1.0960E-02 1.8110E-02 2.3792E-02 1.4859E-02 1.4446E-03 -5.5604E-03 S12 -1.3005E+00 9.1293E-02 6.6486E-04 1.6687E-03 5.2590E-03 1.2353E-03 1.6445E-03 S13 -1.1667E+00 4.2691E-01 -8.7255E-02 5.2612E-02 -1.6261E-02 1.8267E-03 -3.6183E-03 S14 -2.3060E+00 3.8110E-01 -1.1113E-01 6.9893E-02 -1.1920E-02 7.4558E-03 -3.6573E-03 Surface number A18 A20 A22 A24 A26 A28 A30 S1 -9.6475E-04 -6.5907E-04 -2.2706E-04 -3.1746E-05 0.0000E+00 0.0000E+00 0.0000E+00 S2 1.1458E-03 2.2435E-03 1.1872E-03 2.5915E-04 0.0000E+00 0.0000E+00 0.0000E+00 S3 1.6830E-03 1.5717E-03 7.7593E-04 1.6505E-04 0.0000E+00 0.0000E+00 0.0000E+00 S4 1.0096E-03 -1.0499E-04 -2.4799E-04 8.8525E-05 0.0000E+00 0.0000E+00 0.0000E+00 S5 8.9677E-04 3.5235E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -3.6940E-04 -6.0459E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 3.9189E-05 -2.9349E-06 -6.4971E-06 -2.4168E-06 0.0000E+00 0.0000E+00 0.0000E+00 S8 1.2904E-06 2.4033E-07 2.0843E-07 -3.0524E-07 0.0000E+00 0.0000E+00 0.0000E+00 S9 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 -7.3222E-03 -6.2617E-03 -4.1325E-03 -2.2050E-03 -9.2996E-04 -2.9186E-04 -4.9728E-05 S12 7.6036E-04 -3.5516E-04 -1.9645E-05 1.5645E-04 6.9866E-05 -5.9291E-05 3.8166E-06 S13 -3.4493E-04 -2.5226E-03 6.6903E-04 2.7396E-04 -4.8650E-05 -4.4653E-04 1.7157E-05 S14 4.3785E-04 -2.7789E-03 -5.9606E-04 -7.5703E-04 1.5679E-04 -7.0665E-05 1.1658E-04

[0170] Table 18

[0171] Figure 12a shows the axial chromatic aberration curve of the optical imaging system of Example 6, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the lens. Figure 12b shows the astigmatism curve of the optical imaging system of Example 6, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 12c shows the distortion curve of the optical imaging system of Example 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 Example 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 as shown, the optical imaging system given in Example 6 can achieve good imaging quality. Specific Example 7

[0173] Figure 13 is a schematic structural diagram of the lens group of the optical imaging system of Example 7 of the present invention. The optical imaging system sequentially includes, from the object side to the image side along the first optical axis direction: a prism EO, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0174] The prism EO has a light incident surface, a light reflecting surface, and a light exiting surface. The first lens E1 has a positive 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 concave. 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 negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the light incident surface of the prism EO to the surfaces of S16 and finally forms an image on the imaging surface S17.

[0175] As shown in Table 19, it is the basic parameter table of the optical imaging system of Example 7, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0176]

[0177]

[0178] Table 19

[0179] As shown in Table 20, in Embodiment 7, the total effective focal length f of the optical imaging system is 8.65 mm, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 is 9.90 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 is ImgH = 4.20 mm, and half of the maximum field of view angle of the optical imaging system is Semi-FOV = 25.45°. The parameters of each relational expression are as explained in the first embodiment, and the numerical values of each relational expression are listed in the following table.

[0180]

[0181] Table 20

[0182] In Embodiment 7, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 21 shows the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0183]

[0184]

[0185] Table 21

[0186] Figure 14a shows the axial chromatic aberration curve of the optical imaging system of Embodiment 7, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 14b shows the astigmatism curve of the optical imaging system of Embodiment 7, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14c shows the distortion curve of the optical imaging system of Embodiment 7, which represents the distortion magnitude values corresponding to different image heights. Figure 14d shows the longitudinal chromatic aberration curve of the optical imaging system of Embodiment 7, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 14a to 14dAs can be seen, the optical imaging system given in Embodiment 7 can achieve good imaging quality. Specific Embodiment 8

[0188] Figure 15 FIG. is a schematic structural diagram of a lens group of Embodiment 8 of the optical imaging system of the present invention. The optical imaging system sequentially includes, from the object side to the image side along the first optical axis direction: a prism EO, a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0189] The prism EO has a light incident surface, a light reflecting surface, and a light exiting surface. The first lens E1 has a positive 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 negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces from the light incident surface of the prism EO to S16 and finally forms an image on the imaging surface S17.

[0190] As shown in Table 22, it is a basic parameter table of the optical imaging system of Embodiment 8, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0191]

[0192]

[0193] Table 22

[0194] As shown in Table 23, in Embodiment 8, the total effective focal length f of the optical imaging system is 8.72 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 is 9.90 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 is ImgH = 4.20 mm, and half of the maximum field of view angle of the optical imaging system is Semi - FOV = 25.27°. The parameters of each relationship are as explained in the first embodiment, and the values of each relationship are listed in the following table.

[0195]

[0196] Table 23

[0197] In Embodiment 8, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 24 shows the high-order coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0198]

[0199]

[0200] Table 24

[0201] Figure 16a shows the axial chromatic aberration curve of the optical imaging system of Embodiment 8, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 16b shows the astigmatism curve of the optical imaging system of Embodiment 8, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 16c shows the distortion curve of the optical imaging system of Embodiment 8, which represents the distortion magnitude values corresponding to different image heights. Figure 16d shows the longitudinal chromatic aberration curve of the optical imaging system of Embodiment 8, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 16a to 16d shown, the optical imaging system given in Embodiment 8 can achieve good imaging quality.

[0202] 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 in 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 seven, and the optical imaging system includes: A prism configured such that light incident on the prism in the second optical axis direction is reflected and exits the prism in the first optical axis direction, where the first optical axis direction is perpendicular to the second optical axis direction; The optical imaging system further sequentially includes, from the prism to the image side along the first optical axis direction: A diaphragm; A first lens with positive optical power, having a convex object side surface and a concave image side surface; A second lens with positive optical power, having a convex object side surface; A third lens with negative optical power, having a convex object side surface and a concave image side surface; A fourth lens with optical power, having a convex object side surface and a concave image side surface; A fifth lens with positive optical power, having a convex object side surface and a convex image side surface; A sixth lens with optical power, having a convex object side surface and a concave image side surface; A seventh lens with negative optical power, having a concave image side surface; The fourth lens has positive optical power and the sixth lens has negative optical power, or the fourth lens has negative optical power and the sixth lens has negative optical power, or the fourth lens has negative optical power and the sixth lens has positive optical power; Wherein, the F-number Fno of the optical imaging system satisfies: 1.3 ≤ Fno ≤ 1.65; 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: -0.38 ≤ R9 / R10 ≤ -0.06; The effective focal length f of the optical imaging system, the radius of curvature R11 of the object side surface of the sixth lens, and the radius of curvature R12 of the image side surface of the sixth lens satisfy: 0.48 ≤ f / R11 + f / R12 ≤ 0.

97.

2. The optical imaging system according to claim 1, characterized in that: Half of the maximum field of view angle Semi-FOV of the optical imaging system satisfies: 24.3° ≤ Semi-FOV ≤ 26.93°; 3. The optical imaging system according to claim 1, wherein: The on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy: 1.1 ≤ TTL / f ≤ 1.16; 4. The optical imaging system according to claim 1, characterized in that: Half of the maximum field of view angle Semi-FOV of the optical imaging system and the effective focal length f of the optical imaging system satisfy: 4.12 mm ≤ tan(Semi-FOV) × f ≤ 4.44 mm; 5. The optical imaging system according to claim 1, wherein: The effective focal length f2 of the second lens and the effective focal length f of the optical imaging system satisfy: 0.74 ≤ f2 / f ≤ 0.9; 6. The optical imaging system according to claim 1, wherein: The radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, and the effective focal length f3 of the third lens satisfy: 0.48 ≤ |(R5 - R6) / f3| ≤ 0.66; 7. The optical imaging system according to claim 1, wherein: The edge thickness ET2 of the second lens at the maximum effective diameter and the central thickness CT2 of the second lens on the optical axis satisfy: 0.15 ≤ ET2 / CT2 ≤ 0.

41.

8. The optical imaging system according to claim 1, wherein: The axial interval distance SAG12 between the intersection of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens and the axial interval distance SAG52 between the intersection of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens satisfy: -1.58 ≤ SAG12 / SAG52 ≤ -0.

79.

9. The optical imaging system according to claim 1, wherein: The air interval T23 between the second lens and the third lens on the optical axis and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 0.11 ≤ T23 / T34 ≤ 0.

27.

10. The optical imaging system according to claim 1, characterized in that: Half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system and the entrance pupil diameter EPD satisfy: 0.6 ≤ ImgH / EPD ≤ 0.

79.

11. The optical imaging system according to claim 1, characterized in that: The air interval T45 between the fourth lens and the fifth lens on the optical axis, the air interval T56 between the fifth lens and the sixth lens on the optical axis, the air interval T67 between the sixth lens and the seventh lens on the optical axis, and the axial distance TTL from the object side of the first lens to the imaging surface satisfy: 0.17 ≤ (T45 + T56 + T67) / TTL ≤ 0.23.

Images