Optical imaging system

Abstract

The present application discloses an optical imaging system, which sequentially includes, from the object side to the image side along the optical axis: a prism that reflects light incident on the prism in a first direction to exit the prism in a second direction; and an aperture stop, a first lens with a focal power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens that are sequentially arranged from the prism to the image side in the second direction. The total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD < 1.4.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and specifically, to an optical imaging system. Background Art

[0002] Currently, in order to have a zoom function, the optical imaging systems applied to portable electronic products such as smart phones mainly adopt digital zoom and low-power optical zoom technologies. However, due to the limitation of the thickness of portable electronic products such as mobile phones, the horizontally placed optical imaging system can only have a relatively small focal length, and the optical zoom ability is very limited.

[0003] Meanwhile, with the development of the industry, most lens manufacturers gradually adopt a periscope structure for zooming. This structure is different from the side-by-side arrangement of traditional dual cameras. It adjusts the originally vertically placed camera to be horizontally arranged inside the mobile phone, and uses a special optical prism to refract light into the lens group to achieve the imaging effect, thereby greatly increasing the focal length of the camera. However, the addition of the prism will have an adverse effect on the image quality of the optical imaging system. Summary of the Invention

[0004] On the one hand, the present application provides such an optical imaging system, which includes: a prism that reflects the light incident on the prism along a first direction to exit the prism along a second direction; and a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the prism to the image side along the second direction, wherein each of the first lens to the seventh lens has a focal power. The total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD < 1.4.

[0005] In one embodiment, at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror surface.

[0006] In one embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the effective focal length f7 of the seventh lens satisfy: -1.5 < (f1 + f7) / f3 < 0.

[0007] In one embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging system satisfy: 0.6 < f2 / f < 1.

[0008] In one embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens, and the radius of curvature R3 of the object side surface of the second lens satisfy: 0.2 < R3 / (R1 + R2) < 0.5.

[0009] In one embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis may satisfy: 0.4 < CT1 / CT2 < 1.1.

[0010] In one embodiment, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the interval distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy: 1.4 < (CT4 + CT5) / T45 < 2.6.

[0011] In one embodiment, the curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, and the total effective focal length f of the optical imaging system may satisfy: 0.8 < (R7 + R8) / f < 1.3.

[0012] In one embodiment, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging system and the total effective focal length f of the optical imaging system may satisfy: TTL / f ≤ 1.15.

[0013] In one embodiment, half of the maximum field of view Semi-FOV of the optical imaging system may satisfy: 20° < Semi-FOV < 30°.

[0014] In one embodiment, the second lens has a positive optical power; the object side surface of the fourth lens is convex, and the image side surface is concave; and the image side surface of the sixth lens is concave.

[0015] On the other hand, the present application provides an optical imaging system, which sequentially includes, from the object side to the image side along the optical axis: a prism that reflects the light incident on the prism in a first direction to exit the prism in a second direction; and an aperture, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the prism to the image side in the second direction, wherein the second lens has a positive optical power, the object side surface of the fourth lens is convex, the image side surface is concave, and the image side surface of the sixth lens is concave.

[0016] In one embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging system may satisfy: 0.6 < f2 / f < 1.

[0017] In one embodiment, the curvature radius R1 of the object side surface of the first lens, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens may satisfy: 0.2 < R3 / (R1 + R2) < 0.5.

[0018] In one embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis may satisfy: 0.4 < CT1 / CT2 < 1.1.

[0019] In one embodiment, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the spacing distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy: 1.4 < (CT4 + CT5) / T45 < 2.6.

[0020] In one embodiment, the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, and the total effective focal length f of the optical imaging system may satisfy: 0.8 < (R7 + R8) / f < 1.3.

[0021] In one embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the effective focal length f7 of the seventh lens may satisfy: -1.5 < (f1 + f7) / f3 < 0.

[0022] In one embodiment, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging system and the total effective focal length f of the optical imaging system may satisfy: TTL / f ≤ 1.15.

[0023] In one embodiment, half of the maximum field of view Semi-FOV of the optical imaging system may satisfy: 20° < Semi-FOV < 30°.

[0024] In one embodiment, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system may satisfy: f / EPD < 1.4.

[0025] This application provides an optical imaging system applicable to portable electronic products, with a large aperture, miniaturization, and good imaging quality, by reasonably distributing the optical powers and surface profiles of each lens and optimizing the optical parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of this application will become more apparent:

[0027] Figure 1 FIG. shows a schematic structural diagram of the optical imaging system according to Embodiment 1 of this application;

[0028] Figures 2A to 2D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging system of Embodiment 1;

[0029] Figure 3Shows a schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application;

[0030] Figures 4A to 4D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system of Embodiment 2;

[0031] Figure 5 Shows a schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application;

[0032] Figures 6A to 6D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system of Embodiment 3;

[0033] Figure 7 Shows a schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application;

[0034] Figures 8A to 8D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system of Embodiment 4;

[0035] Figure 9 Shows a schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application; and

[0036] Figures 10A to 10D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system of Embodiment 5.. Detailed Embodiments

[0037] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] 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 application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0039] In the drawings, for the sake of clarity, the thickness, size, and shape of the lenses have been slightly exaggerated. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0040] In this document, 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.

[0041] It should also be understood that the terms "comprise", "comprising", "have", "include" and / or "including", when used in this specification, denote the presence of the stated features, elements and / or components, but do not preclude 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 a list of listed features, it modifies the entire list of listed features rather than individual elements in the list. In addition, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application". Also, the term "exemplary" is intended to refer to an example or illustration.

[0042] 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 sense unless expressly so defined herein.

[0043] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0044] The features, principles and other aspects of the present application will be described in detail below.

[0045] An optical imaging system according to an exemplary embodiment of the present application may include a prism and seven lenses having optical power. The seven lenses having optical power are respectively a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. As Figure 1 shown, the prism can reflect the light rays incident on the prism along a first direction Y to exit the prism along a second direction X, wherein the first direction Y is perpendicular to the second direction X. These seven lenses are arranged in sequence along the second direction from the prism to the image side. There may be a spacing distance between any two adjacent lenses among the first lens to the seventh lens.

[0046] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: f / EPD < 1.4, where f is the total effective focal length of the optical imaging system and EPD is the entrance pupil diameter of the optical imaging system. Satisfying f / EPD < 1.4 can effectively control the light receiving ability of the optical imaging system, that is, the smaller the aperture value FNO, the greater the amount of incident light obtained by the optical imaging system under the same focal length, which is beneficial to reducing the power consumption of the system and increasing the illuminance of the imaging surface.

[0047] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -1.5 < (f1 + f7) / f3 < 0, where f1 is the effective focal length of the first lens, f3 is the effective focal length of the third lens, and f7 is the effective focal length of the seventh lens. More specifically, f1, f7, and f3 may further satisfy: -1.3 < (f1 + f7) / f3 < -0.4. Satisfying -1.5 < (f1 + f7) / f3 < 0 can effectively correct the chromatic aberration of the optical imaging system and improve the imaging quality of the optical imaging system.

[0048] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.6 < f2 / f < 1, where f2 is the effective focal length of the second lens and f is the total effective focal length of the optical imaging system. More specifically, f2 and f may further satisfy: 0.7 < f2 / f < 1. Satisfying 0.6 < f2 / f < 1 is beneficial to having a relatively large object space field of view, beneficial to correcting off-axis aberrations of the lens group, and beneficial to improving the imaging quality of the optical imaging system.

[0049] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.2 < R3 / (R1 + R2) < 0.5, where R1 is the radius of curvature of the object side surface of the first lens, R2 is the radius of curvature of the image side surface of the first lens, and R3 is the radius of curvature of the object side surface of the second lens. More specifically, R3, R1, and R2 may further satisfy: 0.3 < R3 / (R1 + R2) < 0.5. Satisfying 0.2 < R3 / (R1 + R2) < 0.5 can both effectively correct the off-axis aberrations of the optical imaging system and reduce the distortion of the optical imaging system.

[0050] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.4 < CT1 / CT2 < 1.1, where CT1 is the central thickness of the first lens on the optical axis and CT2 is the central thickness of the second lens on the optical axis. Satisfying 0.4 < CT1 / CT2 < 1.1 is beneficial to ensuring the injection molding of the first lens and the second lens, and improving the imaging quality and processability of the imaging system.

[0051] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.4 < (CT4 + CT5) / T45 < 2.6, where CT4 is the central thickness of the fourth lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, and T45 is the spacing distance between the fourth lens and the fifth lens on the optical axis. Satisfying 1.4 < (CT4 + CT5) / T45 < 2.6 can effectively reduce the thickness sensitivity of the system and is beneficial to correcting field curvature.

[0052] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.8 < (R7 + R8) / f < 1.3, where R7 is the curvature radius of the object side surface of the fourth lens, R8 is the curvature radius of the image side surface of the fourth lens, and f is the total effective focal length of the optical imaging system. More specifically, R7, R8, and f may further satisfy: 0.9 < (R7 + R8) / f < 1.2. Satisfying 0.8 < (R7 + R8) / f < 1.3 is beneficial to eliminating spherical aberration of the optical imaging system and ensuring the imaging quality of the optical system.

[0053] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: TTL / f ≤ 1.15, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging system, and f is the total effective focal length of the optical imaging system. Satisfying TTL / f ≤ 1.15 can ensure that the focal length and the total lens length of the optical imaging system are within a reasonable range, which is beneficial to the optical imaging system having characteristics such as a small depth of field, a high magnification, and miniaturization.

[0054] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 20° < Semi-FOV < 30°, where Semi-FOV is half of the maximum field of view angle of the optical imaging system. More specifically, Semi-FOV may further satisfy: 23° < Semi-FOV < 28°. Satisfying 20° < Semi-FOV < 30° is beneficial to imaging object information in a larger range on the chip.

[0055] In an exemplary embodiment, the second lens may have a positive optical power; the object side surface of the fourth lens may be convex, and the image side surface may be concave; and the image side surface of the sixth lens may be concave. By reasonably matching the optical power and surface type characteristics of the fourth lens, the processability of the fourth lens can be ensured, which is beneficial to reducing the chromatic aberration of the optical imaging system and improving the imaging quality of the optical imaging system. By reasonably matching the optical power and surface type characteristics of the sixth lens, it is beneficial to correcting the off-axis aberration of the lens group, improving the imaging quality, and can also effectively reduce the tolerance sensitivity of the optical imaging system.

[0056] In an exemplary embodiment, the optical imaging system according to the present application further includes a diaphragm disposed between the prism 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. The present application proposes an optical imaging system with characteristics such as miniaturization, large aperture, and high imaging quality. The optical imaging system according to the above embodiment of the present application may employ multiple lenses, such as seven lenses as described above. By reasonably distributing the optical power, surface type, central thickness of each lens, and the on-axis spacing between each lens, etc., the incident light can be effectively converged, the total optical length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, making the optical imaging system more conducive to production and processing.

[0057] In an embodiment of the present application, 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 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, 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.

[0058] 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 also include other numbers of lenses.

[0059] The following further describes specific embodiments of the optical imaging system applicable to the above embodiments with reference to the accompanying drawings.

[0060] Example 1

[0061] The following refers to Figures 1 to 2D Describe the optical imaging system according to Embodiment 1 of the present application. Figure 1 Fig. shows a schematic structural diagram of the optical imaging system according to Embodiment 1 of the present application.

[0062] AsFigure 1 As shown in Figure 1 , the optical imaging system sequentially includes, from the object side to the image side along the second direction: a prism E0, 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.

[0063] The prism E0 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 concave. 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 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 E0 to the image side surface S16 of the seventh lens E7 and finally forms an image on the imaging surface S17.

[0064] Table 1 shows the basic parameter table of the optical imaging system of Example 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0065]

[0066]

[0067] Table 1

[0068] In this example, the total effective focal length f of the optical imaging system is 9.50 mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system on the optical axis is 9.99 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging system ImgH is 4.20 mm, half of the maximum field of view angle of the optical imaging system Semi - FOV is 23.70°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.30.

[0069] In Example 1, 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, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0070]

[0071] Wherein, x is the sagitta, which is the distance from the vertex of the aspheric surface to the position along the optical axis at a height of h; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic constant; Ai is the correction coefficient of the i-th order of the aspheric surface. Tables 2-1 and 2-2 below give 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 .

[0072]

[0073]

[0074] Table 2-1

[0075] Plane number A18 A20 A22 A24 A26 A28 A30 S1 -1.9782E-05 -5.1606E-05 3.4676E-05 1.1694E-05 0.0000E+00 0.0000E+00 0.0000E+00 S2 -2.8845E-04 9.7600E-05 1.0469E-04 -5.5155E-05 0.0000E+00 0.0000E+00 0.0000E+00 S3 7.4319E-04 4.0116E-04 3.8560E-05 -3.9207E-06 0.0000E+00 0.0000E+00 0.0000E+00 S4 1.6442E-04 1.5119E-04 -5.6282E-05 -4.0086E-05 0.0000E+00 0.0000E+00 0.0000E+00 S5 -3.1567E-05 2.9746E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -9.0913E-06 -1.2256E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 2.1339E-05 1.3229E-05 4.6910E-06 5.0517E-06 0.0000E+00 0.0000E+00 0.0000E+00 S8 1.9873E-05 -4.1190E-06 -4.6145E-06 3.1929E-06 0.0000E+00 0.0000E+00 0.0000E+00 S9 -4.6239E-05 -1.8350E-05 1.7683E-05 4.0576E-06 3.8723E-06 0.0000E+00 0.0000E+00 S10 -1.3526E-04 -5.0475E-05 2.3312E-05 1.1135E-05 8.0755E-06 0.0000E+00 0.0000E+00 S11 -1.0034E-03 -5.4652E-04 2.5804E-04 1.5618E-04 2.1400E-05 -2.1932E-05 4.8833E-05 S12 -2.8548E-04 -6.7859E-04 6.3906E-04 7.7438E-04 2.0694E-04 -1.7997E-04 -5.5840E-05 S13 1.3133E-04 -3.7599E-04 1.2525E-03 -3.8449E-04 -3.4009E-04 -7.8388E-05 4.0903E-04 S14 -1.6194E-03 -1.5418E-03 5.3223E-04 1.9520E-04 5.7227E-04 7.4545E-05 1.2603E-04

[0076] Table 2-2

[0077] Figure 2A shows the axial chromatic aberration curve of the optical imaging system of Example 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 Example 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 Example 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 Example 1, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 2A to 2D it can be seen that the optical imaging system given in Example 1 can achieve good imaging quality.

[0078] Example 2

[0079] The following refers to Figures 3 to 4D to describe the optical imaging system according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 3 shows a schematic structural diagram of the optical imaging system according to Embodiment 2 of the present application.

[0080] As Figure 3As shown in the figure, the optical imaging system sequentially includes, from the object side to the image side: a prism E0, 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.

[0081] The prism E0 has a light incident surface, a light reflecting surface, and a light exiting surface. The first lens E1 has a positive optical power, with its object side surface S1 being convex and its image side surface S2 being concave. The second lens E2 has a positive optical power, with its object side surface S3 being convex and its image side surface S4 being concave. The third lens E3 has a negative optical power, with its object side surface S5 being convex and its image side surface S6 being concave. The fourth lens E4 has a positive optical power, with its object side surface S7 being convex and its image side surface S8 being concave. The fifth lens E5 has a positive optical power, with its object side surface S9 being convex and its image side surface S10 being concave. The sixth lens E6 has a positive optical power, with its object side surface S11 being convex and its image side surface S12 being concave. The seventh lens E7 has a negative optical power, with its object side surface S13 being concave and its image side surface S14 being 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 E0 to the image side surface S16 of the seventh lens E7 and finally forms an image on the imaging surface S17.

[0082] In this example, the total effective focal length f of the optical imaging system is 8.02 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 8.99 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging system is ImgH = 4.20 mm, half of the maximum field of view angle of the optical imaging system is Semi - FOV = 25.96°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.30.

[0083] Table 3 shows the basic parameter table of the optical imaging system of Example 2, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Tables 4 - 1 and 4 - 2 show the high - order term coefficients of the aspherical mirror surfaces that can be used in Example 2, and each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0084]

[0085] Table 3

[0086]

[0087]

[0088] Table 4 - 1

[0089] Plane number A18 A20 A22 A24 A26 A28 A30 S1 2.5666E-05 1.0322E-05 1.2609E-06 -1.0815E-06 0.0000E+00 0.0000E+00 0.0000E+00 S2 -6.6816E-05 3.3757E-05 -9.9653E-06 9.2233E-07 0.0000E+00 0.0000E+00 0.0000E+00 S3 -5.3349E-05 1.8756E-05 -1.0484E-06 -3.1144E-07 2.3701E-08 -2.2701E-08 0.0000E+00 S4 2.0439E-05 -3.7068E-06 3.8671E-07 -1.7022E-08 0.0000E+00 0.0000E+00 0.0000E+00 S5 -8.8870E-06 7.8459E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -2.0091E-05 -7.1225E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 9.8502E-05 7.1946E-05 2.2705E-05 1.6534E-05 0.0000E+00 0.0000E+00 0.0000E+00 S8 4.2655E-06 2.7214E-05 5.7233E-07 9.6167E-06 0.0000E+00 0.0000E+00 0.0000E+00 S9 2.4837E-05 -5.6219E-06 1.9890E-05 -3.1215E-06 1.2328E-05 0.0000E+00 0.0000E+00 S10 1.4764E-04 5.3876E-05 3.8103E-06 7.9123E-07 -1.0787E-06 0.0000E+00 0.0000E+00 S11 -5.4702E-05 -3.5294E-04 -1.0640E-04 -5.2125E-07 2.1987E-05 -1.3931E-05 2.2935E-05 S12 2.0163E-03 8.2580E-04 -2.6683E-05 -8.6046E-05 -4.2127E-05 -1.6456E-05 7.5555E-06 S13 2.7748E-03 9.2747E-04 -2.7235E-04 -3.3161E-04 -2.3017E-04 2.1043E-06 7.0300E-05 S14 1.4953E-04 -1.5958E-04 4.4255E-04 1.1053E-04 -4.0702E-05 -5.2904E-06 -5.7401E-06

[0090] Table 4-2

[0091] 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 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 lateral chromatic aberration curve of the optical imaging system of Embodiment 2, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 4A to 4D it can be known that the optical imaging system given in Embodiment 2 can achieve good imaging quality.

[0092] Example 3

[0093] The following refers to Figures 5 to 6D describes the optical imaging system according to Embodiment 3 of the present application. Figure 5 shows a schematic structural diagram of the optical imaging system according to Embodiment 3 of the present application.

[0094] As Figure 5 shown, the optical imaging system sequentially includes, from the object side to the image side: prism E0, aperture STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging surface S17.

[0095] Prism E0 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 concave. 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 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 light incident surface of the prism E0 to the image side surface S16 of the seventh lens E7 and finally forms an image on the imaging surface S17.

[0096] In this example, the total effective focal length f of the optical imaging system is 9.29 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 9.99 mm, half of the diagonal length ImgH of the effective pixel region on the imaging surface S17 of the optical imaging system is 4.20 mm, half of the maximum field of view angle Semi - FOV of the optical imaging system is 23.91°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.30.

[0097] Table 5 shows the basic parameter table of the optical imaging system of Example 3, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Tables 6 - 1 and 6 - 2 show the higher - order term coefficients of the aspherical mirror surfaces that can be used in Example 3, where each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0098]

[0099] Table 5

[0100] Plane number A4 A6 A8 A10 A12 A14 A16 S1 -9.6287E-02 -9.7009E-02 -3.2382E-02 -5.3255E-03 1.9452E-03 1.4721E-03 4.0384E-04 S2 -4.1516E-01 -6.0846E-02 -2.0961E-02 7.7029E-03 2.7187E-03 -1.5329E-03 1.5423E-04 S3 -3.6149E-01 -6.3532E-02 -4.8369E-02 -7.6789E-03 2.8083E-03 1.9327E-03 2.5115E-03 S4 -9.3380E-02 1.3266E-02 -2.5247E-02 1.0982E-02 7.1970E-04 2.0708E-03 1.3476E-04 S5 -2.6359E-01 9.1262E-02 -8.8218E-03 6.7549E-03 7.4321E-04 1.1619E-03 1.5024E-04 S6 -8.1326E-02 3.3244E-02 2.2404E-03 -1.8070E-03 -8.6838E-04 -1.5927E-05 1.3394E-04 S7 -5.0839E-03 3.4114E-02 6.5981E-03 1.8470E-03 1.9595E-04 1.5784E-04 7.9361E-05 S8 -7.1720E-02 1.7220E-02 1.4201E-03 8.4441E-04 5.2498E-05 3.6364E-05 2.1016E-06 S9 -2.9266E-01 -3.3103E-02 -2.4782E-03 -1.1528E-04 1.1127E-04 4.4388E-05 1.2648E-05 S10 -4.9447E-01 -1.4034E-02 7.9702E-03 5.2885E-03 2.4555E-03 1.3440E-03 6.8648E-04 S11 -9.8637E-01 9.0453E-02 5.3069E-02 1.0692E-02 7.3037E-04 -4.3876E-04 -3.0338E-03 S12 -1.3118E+00 1.4244E-01 1.9862E-03 6.1491E-03 2.9022E-03 6.5677E-03 3.6105E-03 S13 -1.2808E+00 5.1790E-01 -1.0806E-01 4.5966E-02 -2.4213E-02 -1.8858E-03 -2.3235E-03 S14 -2.2017E+00 3.4855E-01 -9.0382E-02 7.6561E-02 -1.7274E-02 -1.2769E-03 -6.6114E-03

[0101] Table 6 - 1

[0102] Plane number A18 A20 A22 A24 A26 A28 A30 S1 8.1081E-06 -4.3339E-05 -7.1086E-06 -2.9530E-06 0.0000E+00 0.0000E+00 0.0000E+00 S2 -3.0531E-04 8.7921E-05 -1.1625E-04 5.6742E-06 0.0000E+00 0.0000E+00 0.0000E+00 S3 1.0731E-03 6.2696E-04 9.5843E-05 1.9219E-05 0.0000E+00 0.0000E+00 0.0000E+00 S4 2.4323E-04 8.4293E-05 7.2349E-05 1.4446E-05 0.0000E+00 0.0000E+00 0.0000E+00 S5 5.3920E-06 -1.4126E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 6.7111E-05 1.7894E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 3.7867E-05 2.2875E-05 8.4603E-06 6.2920E-06 0.0000E+00 0.0000E+00 0.0000E+00 S8 2.6472E-06 -7.2269E-07 5.5925E-07 1.8515E-08 0.0000E+00 0.0000E+00 0.0000E+00 S9 5.4314E-06 -1.3695E-06 6.2462E-07 -8.4054E-07 8.8313E-08 0.0000E+00 0.0000E+00 S10 3.6263E-04 1.7536E-04 8.4999E-05 3.2196E-05 1.0919E-05 0.0000E+00 0.0000E+00 S11 -3.1609E-03 -1.4243E-03 -7.8555E-05 2.5342E-04 1.2207E-04 2.6664E-05 -8.1307E-06 S12 1.1523E-03 -4.2687E-06 2.5829E-04 2.5978E-04 5.3429E-05 -2.3159E-05 -2.8273E-05 S13 -1.4763E-03 -1.4840E-03 -3.2609E-04 -6.4312E-04 -3.7942E-04 -1.1557E-04 1.4581E-06 S14 -2.4305E-03 -1.9693E-03 -3.7856E-04 -4.0070E-04 -1.0254E-04 -8.2914E-05 -2.4013E-05

[0103] Table 6 - 2

[0104] Figure 6A Shows the axial chromatic aberration curve of the optical imaging system of Example 3, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 6B Shows the astigmatism curve of the optical imaging system of Example 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6C Shows the distortion curve of the optical imaging system of Example 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 Example 3, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 6A to 6D It can be seen that the optical imaging system given in Example 3 can achieve good imaging quality.

[0105] Example 4

[0106] The following refers to Figures 7 to 8D describes the optical imaging system according to Embodiment 4 of the present application. Figure 7 Shows a schematic structural diagram of the optical imaging system according to Embodiment 4 of the present application.

[0107] As Figure 7As shown in the figure, the optical imaging system sequentially includes, from the object side to the image side: a prism E0, 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.

[0108] The prism E0 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 concave. 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 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 E0 to the image side surface S16 of the seventh lens E7 and finally forms an image on the imaging surface S17.

[0109] In this example, the total effective focal length f of the optical imaging system is 9.16 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 9.97 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging system is ImgH = 4.20 mm, half of the maximum field of view angle of the optical imaging system is Semi - FOV = 24.18°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.30.

[0110] Table 7 shows the basic parameter table of the optical imaging system of Example 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Tables 8 - 1 and 8 - 2 show the higher - order term coefficients of the aspherical mirror surfaces that can be used in Example 4, and each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0111]

[0112]

[0113] Table 7

[0114] Plane number A4 A6 A8 A10 A12 A14 A16 S1 -9.5192E-02 -9.6471E-02 -3.3516E-02 -5.7642E-03 1.9023E-03 1.5574E-03 5.4623E-04 S2 -4.1668E-01 -6.0176E-02 -2.0325E-02 7.2515E-03 2.1160E-03 -1.7777E-03 1.9545E-04 S3 -3.6688E-01 -6.5753E-02 -4.8606E-02 -6.9235E-03 3.3017E-03 2.0147E-03 2.5334E-03 S4 -9.3250E-02 1.1438E-02 -2.8376E-02 1.0863E-02 1.4312E-03 2.9364E-03 4.5702E-04 S5 -2.6343E-01 9.0730E-02 -7.9491E-03 6.6148E-03 4.8670E-04 1.3895E-03 1.8664E-04 S6 -8.2934E-02 3.2661E-02 2.6476E-03 -1.7329E-03 -9.9461E-04 -1.3874E-04 4.5849E-05 S7 -3.5536E-03 3.5126E-02 6.4638E-03 1.8624E-03 2.1134E-04 1.6892E-04 5.5119E-05 S8 -7.3376E-02 1.6938E-02 1.3045E-03 7.8512E-04 2.8449E-05 4.4584E-05 -1.7905E-06 S9 -2.8993E-01 -3.2985E-02 -2.5008E-03 1.9882E-04 1.0597E-04 1.2407E-04 4.1018E-06 S10 -4.9278E-01 -1.3557E-02 8.8657E-03 5.9615E-03 2.5499E-03 1.3949E-03 6.0119E-04 S11 -9.9066E-01 9.0574E-02 5.2186E-02 1.0330E-02 1.2156E-03 -3.9245E-04 -3.2453E-03 S12 -1.2987E+00 1.4339E-01 1.0156E-03 6.2191E-03 3.4680E-03 6.7776E-03 3.4210E-03 S13 -1.2796E+00 5.1662E-01 -1.0798E-01 4.6499E-02 -2.4002E-02 -1.4587E-03 -2.0664E-03 S14 -2.2069E+00 3.4192E-01 -8.8863E-02 7.4220E-02 -1.7340E-02 -1.5623E-03 -6.1432E-03

[0115] Table 8 - 1

[0116] Plane number A18 A20 A22 A24 A26 A28 A30 S1 1.2443E-04 2.5162E-05 -5.9412E-07 -1.1623E-05 0.0000E+00 0.0000E+00 0.0000E+00 S2 -2.7611E-04 1.5374E-06 -1.2353E-04 4.0299E-05 0.0000E+00 0.0000E+00 0.0000E+00 S3 1.0662E-03 5.0038E-04 3.0616E-05 2.2205E-05 0.0000E+00 0.0000E+00 0.0000E+00 S4 4.7137E-04 8.2172E-05 6.7759E-05 -1.5479E-06 0.0000E+00 0.0000E+00 0.0000E+00 S5 1.5283E-04 1.6874E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 3.9222E-05 2.9253E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 3.1600E-05 1.1888E-05 7.3528E-06 1.3328E-06 0.0000E+00 0.0000E+00 0.0000E+00 S8 7.2420E-06 -2.1888E-06 1.3221E-06 -6.1819E-07 0.0000E+00 0.0000E+00 0.0000E+00 S9 2.6871E-05 -9.3455E-06 5.3454E-06 -5.9246E-06 1.7802E-06 0.0000E+00 0.0000E+00 S10 3.1000E-04 1.1470E-04 6.2122E-05 1.7111E-05 1.0839E-05 0.0000E+00 0.0000E+00 S11 -3.2652E-03 -1.3098E-03 3.9902E-05 3.4848E-04 1.6010E-04 4.6303E-05 -4.6151E-06 S12 9.1058E-04 -3.0331E-05 1.6025E-04 2.6104E-04 7.5460E-05 -9.1884E-06 -3.6576E-05 S13 -1.4771E-03 -1.4617E-03 -5.0143E-04 -4.9974E-04 -3.3440E-04 -2.0934E-04 -2.0569E-05 S14 -2.3168E-03 -1.6619E-03 -5.4276E-04 -4.5941E-04 -1.4875E-04 -1.0622E-04 -1.1046E-05

[0117] Table 8-2

[0118] Figure 8A shows the axial chromatic aberration curve of the optical imaging system of Example 4, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 8B shows the astigmatism curve of the optical imaging system of Example 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 Example 4, which represents the distortion magnitude values corresponding to different image heights. Figure 8D shows the lateral chromatic aberration curve of the optical imaging system of Example 4, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 8A to 8D it can be seen that the optical imaging system given in Example 4 can achieve good imaging quality.

[0119] Example 5

[0120] The following refers to Figures 9 to 10D describes the optical imaging system according to Embodiment 5 of the present application. Figure 9 shows a schematic structural diagram of the optical imaging system according to Embodiment 5 of the present application.

[0121] As Figure 9 shown, the optical imaging system sequentially includes, from the object side to the image side: a prism E0, 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.

[0122] The prism E0 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 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 seventh lens E7 has a negative optical power, its object side surface S13 is convex, 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 E0 to the image side surface S16 of the seventh lens E7 and finally forms an image on the imaging surface S17.

[0123] In this example, the total effective focal length f of the optical imaging system is 8.11 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 9.30 mm, half of the diagonal length of the effective pixel region on the imaging surface S17 of the optical imaging system is ImgH = 4.20 mm, half of the maximum field of view angle of the optical imaging system is Semi-FOV = 27.23°, and the ratio f / EPD of the total effective focal length f of the optical imaging system to the entrance pupil diameter EPD of the optical imaging system is 1.30.

[0124] Table 9 shows the basic parameter table of the optical imaging system of Example 5, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm). Tables 10-1 and 10-2 show the high-order term coefficients of the aspherical mirror surfaces that can be used in Example 5, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0125]

[0126]

[0127] Table 9

[0128] Plane number A4 A6 A8 A10 A12 A14 A16 S1 4.5083E-02 -4.0288E-03 -8.5255E-03 -6.5420E-03 -1.6855E-03 -2.1075E-05 2.6846E-04 S2 -1.4361E-01 3.0527E-02 -1.8555E-02 -5.9953E-03 2.4382E-03 -9.8866E-05 7.3184E-04 S3 -1.6520E-01 -1.9431E-03 -2.8485E-02 -1.0918E-02 8.2999E-04 -2.0261E-04 6.8225E-04 S4 -5.4089E-02 3.9545E-03 -1.1765E-02 1.8283E-03 -8.2172E-04 2.5192E-04 -6.5523E-05 S5 -1.9453E-01 6.3528E-02 -6.8971E-03 3.8353E-03 -1.0422E-03 1.7471E-04 -3.1061E-05 S6 -6.4256E-02 5.3963E-02 7.9152E-03 3.4590E-03 2.3682E-04 1.0818E-05 -2.9708E-05 S7 -6.7171E-02 3.9967E-02 6.9224E-03 1.0321E-03 -6.1669E-05 5.4403E-06 -1.4441E-06 S8 -9.1095E-02 2.5552E-02 4.2842E-03 1.2907E-03 1.7448E-04 1.1592E-04 3.3082E-06 S9 -1.6115E-01 -8.9734E-03 -1.6569E-03 1.3099E-04 -1.1161E-04 4.8763E-05 -2.9595E-05 S10 -4.3081E-01 -1.1238E-02 3.6314E-04 1.2650E-03 6.9595E-04 4.4087E-04 3.0296E-04 S11 -8.8490E-01 -5.4616E-02 1.3621E-02 6.9430E-03 3.2143E-03 1.4291E-03 7.2906E-04 S12 -1.1709E+00 2.1088E-02 9.3379E-03 -5.0226E-03 -6.1699E-04 1.9544E-03 -5.6310E-04 S13 -9.8732E-01 2.6323E-01 -9.5516E-02 1.8874E-02 -5.7370E-03 1.2495E-03 -3.6223E-03 S14 -2.3721E+00 2.8194E-01 -7.7818E-02 2.1388E-02 -4.4508E-03 2.4239E-03 -2.3898E-03

[0129] Table 10-1

[0130]

[0131]

[0132] Table 10-2

[0133] Figure 10A shows the axial chromatic aberration curve of the optical imaging system of Example 5, which represents the deviation of the converging points of light rays of different wavelengths after passing through the lens. Figure 10B shows the astigmatism curve of the optical imaging system of Example 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 Example 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 Example 6, which represents the deviation of different image heights of light rays on the imaging surface after passing through the lens. According to Figures 10A to 10D it can be seen that the optical imaging system given in Example 5 can achieve good imaging quality.

[0134] In summary, Examples 1 to 5 respectively satisfy the relationships shown in Table 11.

[0135] Conditional / Example 1 2 3 4 5 TTL / f 1.05 1.12 1.08 1.09 1.15 (f1 + f7) / f3 -0.70 -1.22 -0.80 -0.62 -0.66 f2 / f 0.80 0.86 0.81 0.87 0.82 CT1 / CT2 0.64 0.64 0.71 0.81 0.54 R3 / (R1 + R2) 0.39 0.38 0.39 0.40 0.40 (CT4 + CT5) / T45 1.47 1.57 1.48 1.47 2.53 (R7 + R8) / f 0.95 1.06 0.97 0.98 1.11

[0136] Table 11

[0137] The present application also provides an imaging device, and its electronic photosensitive element may be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device may be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0138] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solution formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. An optical imaging system, characterized in that, The optical imaging system includes: a prism that reflects light incident on the prism in a first direction to exit the prism in a second direction; and a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the prism to the image side in the second direction, where the first lens has a positive optical power, its object side is convex, and its image side is concave; the second lens has a positive optical power, its object side is convex, and its image side is concave; the third lens has a negative optical power, its object side is convex, and its image side is concave; the object side of the fourth lens is convex, and its image side is concave; the fifth lens has a positive optical power, its object side is convex, and its image side is concave; the image side of the sixth lens is concave; the seventh lens has a negative optical power, and its image side is concave; the number of lenses with optical power in the optical imaging system is seven; the central thickness CT4 of the fourth lens on the optical axis of the optical imaging system, the central thickness CT5 of the fifth lens on the optical axis, and the spacing distance T45 between the fourth lens and the fifth lens on the optical axis satisfy: 1.47 ≤ (CT4 + CT5) / T45 ≤ 2.53; and the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the effective focal length f7 of the seventh lens satisfy: -1.22 ≤ (f1 + f7) / f3 ≤ -0.

62.

2. The optical imaging system according to claim 1, characterized in that, The effective focal length f2 of the second lens and the total effective focal length f of the optical imaging system satisfy: 0.80 ≤ f2 / f ≤ 0.

87.

3. The optical imaging system according to claim 1, wherein The curvature radius R1 of the object side of the first lens, the curvature radius R2 of the image side of the first lens, and the curvature radius R3 of the object side of the second lens satisfy: 0.38 ≤ R3 / (R1 + R2) ≤ 0.

40.

4. The optical imaging system according to claim 1, wherein The central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 0.54 ≤ CT1 / CT2 ≤ 0.

81.

5. The optical imaging system according to claim 1, wherein The curvature radius R7 of the object side of the fourth lens, the curvature radius R8 of the image side of the fourth lens, and the total effective focal length f of the optical imaging system satisfy: 0.95 ≤ (R7 + R8) / f ≤ 1.

11.

6. The optical imaging system according to any one of claims 1-5, characterized in that, The distance TTL on the optical axis from the object side of the first lens to the imaging surface of the optical imaging system and the total effective focal length f of the optical imaging system satisfy: 1.05 ≤ TTL / f ≤ 1.

15.

7. The optical imaging system according to any one of claims 1-5, characterized in that, Half of the maximum field of view Semi-FOV of the optical imaging system satisfies: 23.70° ≤ Semi-FOV ≤ 27.23°.

8. The optical imaging system according to any one of claims 2-5, characterized in that, The total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD = 1.30.

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