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 first lens; a second lens with an effective focal length less than zero; a third lens with an effective focal length less than zero; a fourth lens with the radius of curvature of the object side greater than zero; a fifth lens with an effective focal length less than zero; a sixth lens; a seventh lens with an effective focal length greater than zero; and an eighth lens; the number of lenses in the optical imaging system is eight, wherein the radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens satisfy: R12 < R11 < -2 mm, and the total effective focal length f of the optical imaging system and half of the maximum field of view Semi-FOV of the optical imaging system satisfy: tan(Semi-FOV) × f > 5 mm.

Description

Technical Field

[0001] The present application relates to the field of optical devices, and particularly to an eight-lens optical imaging system. Background Art

[0002] With the rapid development of portable devices such as smart phones, more new requirements are put forward for the imaging functions of portable devices such as smart phones. For example, through the optical design of the optical imaging system, the optical imaging system of portable devices such as smart phones can achieve a large field of view. However, traditional optical imaging systems cannot achieve high imaging quality while meeting the requirements of a large field of view. Summary of the Invention

[0003] The present application provides an optical imaging system that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0004] One aspect of the present application provides such an optical imaging system, which sequentially includes, along the optical axis from the object side to the image side: a first lens; a second lens with an effective focal length less than zero; a third lens with an effective focal length less than zero; a fourth lens with a curvature radius of the object side greater than zero; a fifth lens with an effective focal length less than zero; a sixth lens; a seventh lens with an effective focal length greater than zero; and an eighth lens; the number of lenses in the optical imaging system is eight, wherein, the curvature radius R11 of the object side of the sixth lens and the curvature radius R12 of the image side of the sixth lens satisfy: R12 < R11 < -2 mm, and the total effective focal length f of the optical imaging system and half of the maximum field of view Semi-FOV of the optical imaging system satisfy: tan(Semi-FOV) × f > 5 mm.

[0005] According to an exemplary embodiment of the present application, the effective focal length of the sixth lens is less than zero, and the effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging system satisfy: -15 < f6 / f < -1.5.

[0006] According to an exemplary embodiment of the present application, the curvature radius R11 of the object side of the sixth lens and the curvature radius R12 of the image side of the sixth lens satisfy: -18 < (R11 + R12) / (R11 - R12) < -4.

[0007] According to an exemplary embodiment of the present application, the effective focal length of the fourth lens is greater than zero, and the effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging system satisfy: 1.3 < f4 / f < 4.2, and the curvature radius R7 of the object side of the fourth lens and the curvature radius R8 of the image side of the fourth lens satisfy: -4.5 < R7 / R8 < 0.

[0008] According to an exemplary embodiment of the present application, the air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy: 1 < T34 / T67 < 5.

[0009] According to an exemplary embodiment of the present application, the curvature radii of the object side and the image side of the first lens to the third lens are all greater than zero, and the curvature radius R1 of the object side of the first lens, the curvature radius R2 of the image side of the first lens, the curvature radius R3 of the object side of the second lens, and the curvature radius R4 of the image side of the second lens satisfy: 0.5 < (R1 + R2) / (R3 + R4) < 2.5, and the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens satisfy: 0.7 < R5 / R6 < 1.4.

[0010] According to an exemplary embodiment of the present application, the on-axis distance TTL from the object side of the first lens to the imaging surface of the optical imaging system and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging system satisfy: TTL / ImgH ≤ 1.5.

[0011] According to an exemplary embodiment of the present application, the effective focal length of the first lens is greater than zero, and the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy: -2 < f12 / (f1 + f2) < -0.2.

[0012] According to an exemplary embodiment of the present application, the on-axis distance BFL from the image side of the eighth lens to the imaging surface of the optical imaging system and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: BFL / T78 ≥ 6.76.

[0013] According to an exemplary embodiment of the present application, the maximum value maxNa of the refractive indices of all the lenses among the first lens to the third lens and the maximum value maxNb of the refractive indices of all the lenses among the sixth lens to the eighth lens satisfy: maxNa > maxNb.

[0014] According to an exemplary embodiment of the present application, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, the dispersion coefficient V7 of the seventh lens, and the dispersion coefficient V8 of the eighth lens satisfy: V1 + V2 < V7 + V8.

[0015] According to an exemplary embodiment of the present application, the axial distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective semi-aperture of the object side surface of the sixth lens, the axial distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective semi-aperture of the image side surface of the sixth lens, the central thickness CT6 of the sixth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: -6 < SAG62 / CT6 + SAG61 / T56 < -2.

[0016] According to an exemplary embodiment of the present application, the effective focal length of the eighth lens is less than zero, and the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: -1.2 < f7 / f8 < -0.3. The combined focal length f78 of the seventh lens and the eighth lens, the radius of curvature R13 of the object side surface of the seventh lens, and the radius of curvature R15 of the object side surface of the eighth lens satisfy: 1.5 < f78 / (R13 + R15) < 4.5.

[0017] According to an exemplary embodiment of the present application, the central thickness CT7 of the seventh lens on the optical axis and the edge thickness ET7 of the seventh lens satisfy: 0 < ET7 / CT7 ≤ 1.

[0018] According to an exemplary embodiment of the present application, the central thickness CT5 of the fifth lens on the optical axis and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: T56 / CT5 ≤ 1.02.

[0019] According to an exemplary embodiment of the present application, the air gap T67 between the sixth lens and the seventh lens on the optical axis and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 1 ≤ T78 / T67 < 6.

[0020] While constraining the ratio of half of the maximum field of view angle of the optical imaging system to the total effective focal length of the optical imaging system within a certain range, the present application also constrains the radii of curvature of the object side surface and the image side surface of the sixth lens, which can effectively correct the field curvature of the optical imaging system and improve the imaging quality of the optical imaging system while ensuring that the optical imaging system has a large field of view angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects, and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 FIG. 1 shows a schematic structural diagram of an optical imaging system according to Embodiment 1 of the present application;

[0023] Figures 2A to 2DThe axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system according to Embodiment 1 of the present application are respectively shown;

[0024] Figure 3 The schematic structural diagram of the optical imaging system according to Embodiment 2 of the present application is shown;

[0025] Figures 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system according to Embodiment 2 of the present application are respectively shown;

[0026] Figure 5 The schematic structural diagram of the optical imaging system according to Embodiment 3 of the present application is shown;

[0027] Figures 6A to 6D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system according to Embodiment 3 of the present application are respectively shown;

[0028] Figure 7 The schematic structural diagram of the optical imaging system according to Embodiment 4 of the present application is shown;

[0029] Figures 8A to 8D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system according to Embodiment 4 of the present application are respectively shown;

[0030] Figure 9 The schematic structural diagram of the optical imaging system according to Embodiment 5 of the present application is shown;

[0031] Figures 10A to 10D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system according to Embodiment 5 of the present application are respectively shown;

[0032] Figure 11 The schematic structural diagram of the optical imaging system according to Embodiment 6 of the present application is shown;

[0033] Figures 12A to 12D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system according to Embodiment 6 of the present application are respectively shown;

[0034] Figure 13 The schematic structural diagram of the optical imaging system according to Embodiment 7 of the present application is shown; and

[0035] Figures 14A to 14D The axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging system according to Embodiment 7 of the present application are respectively shown. Detailed implementation manners

[0036] For a better understanding of the present application, various aspects of the present application will be described in detail 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.

[0037] In the drawings, for ease of illustration, the thickness, dimensions, 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 to an exact scale.

[0038] 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 being 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.

[0039] It should also be understood that the terms "comprising", "including", "having", "containing", and / or "including having", when used in this specification, mean 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. It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature and do not represent any limitation on the features.

[0040] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application pertains. The terms 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 formalized sense unless expressly so defined herein.

[0041] 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 combination with the embodiments.

[0042] The optical imaging system according to an exemplary embodiment of the present application may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, and these eight lenses are arranged in sequence from the object side to the image side along the optical axis. An air gap may be provided between adjacent two of the first lens to the eighth lens. The effective focal lengths of the second lens, the third lens, and the fifth lens are less than zero, and the effective focal length of the seventh lens is greater than zero. The radius of curvature of the object side surface of the fourth lens is greater than zero.

[0043] Among them, the radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens can satisfy: R12 < R11 < -2 mm; the total effective focal length f of the optical imaging system and half of the maximum field of view angle of the optical imaging system, Semi-FOV, can satisfy: tan(Semi-FOV) × f > 5 mm. By constraining the ratio of half of the maximum field of view angle of the optical imaging system to the total effective focal length of the optical imaging system within a certain range and simultaneously constraining the radii of curvature of the object side and the image side of the sixth lens, it is possible to effectively correct the field curvature of the optical imaging system and improve the imaging quality of the optical imaging system while ensuring that the optical imaging system has a large field of view angle.

[0044] In an exemplary embodiment, the effective focal length of the sixth lens is less than zero, and the effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging system can satisfy: -15 < f6 / f < -1.5. By constraining the ratio of the effective focal length of the sixth lens to the total effective focal length of the optical imaging system within a certain range, it is beneficial to control the incident angle of off-axis field light on the imaging surface and enhance the matching with the photosensitive element and the color filter.

[0045] In an exemplary embodiment, the radius of curvature R11 of the object side of the sixth lens and the radius of curvature R12 of the image side of the sixth lens can satisfy: -18 < (R11 + R12) / (R11 - R12) < -4. Reasonably controlling the mutual relationship between the radius of curvature of the object side of the sixth lens and the radius of curvature of the image side of the sixth lens is beneficial to controlling the incident angle of off-axis field light on the imaging surface and enhancing the matching with the photosensitive element.

[0046] In an exemplary embodiment, the effective focal length of the fourth lens is greater than zero, and the effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging system can satisfy: 1.3 < f4 / f < 4.2, and the radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens can satisfy: -4.5 < R7 / R8 < 0. By constraining the ratio of the effective focal length of the fourth lens to the total effective focal length of the optical imaging system and the ratio of the radius of curvature of the object side of the fourth lens to the radius of curvature of the image side of the fourth lens, it is beneficial to ensure that the fourth lens has an appropriate refractive power, avoid excessive deflection angles of light, and improve the ability of the optical imaging system to correct field curvature.

[0047] In an exemplary embodiment, the air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T67 between the sixth lens and the seventh lens on the optical axis may satisfy: 1 < T34 / T67 < 5. By constraining the ratio of the air gap between the third lens and the fourth lens on the optical axis to the air gap between the sixth lens and the seventh lens on the optical axis within a certain range, the assemblability of the optical imaging system can be ensured, and the phenomenon of alternating positive and negative field curvature of the optical imaging system can be corrected.

[0048] In an exemplary embodiment, the curvature radii of the object side and the image side of the first lens to the third lens are all greater than zero, and the curvature radius R1 of the object side of the first lens, the curvature radius R2 of the image side of the first lens, the curvature radius R3 of the object side of the second lens, and the curvature radius R4 of the image side of the second lens may satisfy: 0.5 < (R1 + R2) / (R3 + R4) < 2.5, and the curvature radius R5 of the object side of the third lens and the curvature radius R6 of the image side of the third lens may satisfy: 0.7 < R5 / R6 < 1.4. By constraining the curvature radii of the object side and the image side of the first lens to the third lens, the refractive powers of the first lens to the third lens can be reasonably distributed, which is beneficial to balancing the aberration of the optical imaging system and improving the resolution of the optical imaging system.

[0049] In an exemplary embodiment, the on-axis distance TTL from the object side of the first lens to the imaging surface of the optical imaging system and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging system may satisfy: TTL / ImgH ≤ 1.5. By constraining the ratio of the on-axis distance from the object side of the first lens to the imaging surface of the optical imaging system to half of the diagonal length of the effective pixel region on the imaging surface of the optical imaging system within a certain range, it is beneficial for the optical imaging system to achieve a shorter optical total length while achieving a larger imaging height, ensuring the miniaturization of the optical imaging system and improving the imaging quality of the optical imaging system.

[0050] In an exemplary embodiment, the effective focal length of the first lens is greater than zero, and the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the combined focal length f12 of the first lens and the second lens may satisfy: -2 < f12 / (f1 + f2) < -0.2. Reasonably controlling the mutual relationship between the effective focal length of the first lens, the effective focal length of the second lens, and the combined focal length of the first lens and the second lens can adjust the light position.

[0051] In an exemplary embodiment, the on-axis distance BFL from the image side surface of the eighth lens to the imaging surface of the optical imaging system and the air gap T78 between the seventh lens and the eighth lens on the optical axis may satisfy: BFL / T78 ≥ 6.76. By constraining the ratio of the on-axis distance from the image side surface of the eighth lens to the imaging surface of the optical imaging system to the air gap between the seventh lens and the eighth lens on the optical axis within a certain range, it is possible to make the optical imaging system have a smaller overall optical length while ensuring the back focal length of the optical imaging system.

[0052] In an exemplary embodiment, the maximum refractive index maxNa of all lenses from the first lens to the third lens and the maximum refractive index maxNb of all lenses from the sixth lens to the eighth lens may satisfy: maxNa > maxNb. By constraining the refractive indices of the three lenses near the object side and the three lenses near the image side in the optical imaging system, it is possible to reasonably distribute the dispersion ability of the optical imaging system and effectively correct the axial chromatic aberration and magnification chromatic aberration of the optical imaging system.

[0053] In an exemplary embodiment, the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, the dispersion coefficient V7 of the seventh lens, and the dispersion coefficient V8 of the eighth lens may satisfy: V1 + V2 < V7 + V8. By constraining the dispersion coefficients of the lenses in the optical imaging system, it is possible to reasonably distribute the dispersion ability of each lens, make the chromatic aberrations generated by each lens balance each other, and further fully correct the aberration of the optical imaging system, improving the imaging quality of the optical imaging system.

[0054] In an exemplary embodiment, the on-axis distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective semi-aperture of the object side surface of the sixth lens, the on-axis distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective semi-aperture of the image side surface of the sixth lens, the central thickness CT6 of the sixth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis may satisfy: -6 < SAG62 / CT6 + SAG61 / T56 < -2. By controlling the above conditional expression, it is possible to control the shape of the sixth lens and improve the imaging quality of the optical imaging system while ensuring the processability of the sixth lens.

[0055] In an exemplary embodiment, the effective focal length of the eighth lens is less than zero, and the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens may satisfy: -1.2 < f7 / f8 < -0.3. The combined focal length f78 of the seventh lens and the eighth lens, the radius of curvature R13 of the object side surface of the seventh lens, and the radius of curvature R15 of the object side surface of the eighth lens may satisfy: 1.5 < f78 / (R13 + R15) < 4.5. By controlling the above conditional expressions, it is possible to reasonably distribute the refractive power of the lenses in the optical imaging system and effectively improve the aberration of the optical imaging system.

[0056] In an exemplary embodiment, the central thickness CT7 of the seventh lens on the optical axis and the edge thickness ET7 of the seventh lens may satisfy: 0 < ET7 / CT7 ≤ 1. By constraining the ratio of the edge thickness of the seventh lens to the central thickness of the seventh lens on the optical axis within a certain range, it is beneficial to ensure that the seventh lens has good processability.

[0057] In an exemplary embodiment, the central thickness CT5 of the fifth lens on the optical axis and the air gap T56 between the fifth lens and the sixth lens on the optical axis may satisfy: T56 / CT5 ≤ 1.02. By constraining the ratio of the air gap between the fifth lens and the sixth lens on the optical axis to the central thickness of the fifth lens on the optical axis within a certain range, the size of the optical imaging system can be reduced, and the volume of the optical imaging system can be prevented from being too large.

[0058] In an exemplary embodiment, the air gap T67 between the sixth lens and the seventh lens on the optical axis and the air gap T78 between the seventh lens and the eighth lens on the optical axis may satisfy: 1 ≤ T78 / T67 < 6. By constraining the ratio of the air gap between the seventh lens and the eighth lens on the optical axis to the air gap between the sixth lens and the seventh lens on the optical axis within a certain range, it is possible to ensure that the optical imaging system has a high space utilization rate and reduce the assembly difficulty of the lenses.

[0059] The optical imaging system according to the above embodiment of the present application may employ multiple lenses, such as the eight lenses described above. By reasonably allocating optical parameters such as the refractive power, surface shape, central thickness of each lens, and axial spacing between each lens, miniaturization and a large field of view of the optical imaging system can be achieved, axial aberration of the optical imaging system can be balanced, and the resolution and imaging quality of the optical imaging system can be improved.

[0060] 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.

[0061] The following further describes specific embodiments of the optical imaging system applicable to the above embodiments with reference to the accompanying drawings.

[0062] Example 1

[0063] The following refers to Figures 1 to 2D Describe the optical imaging system according to Embodiment 1 of the present application.

[0064] As Figure 1As shown, the optical imaging system 100 sequentially includes, from the object side to the image side along the optical axis: 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, and an eighth lens E8. The aperture stop STO can be disposed between the object side and the first lens E1 according to actual needs.

[0065] The first lens E1 has a positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a negative refractive power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a negative refractive power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a positive refractive power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative refractive power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a negative refractive power, its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has a positive refractive power, its object side surface S13 is convex, and its image side surface S14 is convex. The eighth lens E8 has a negative refractive power, its object side surface S15 is convex, and its image side surface S16 is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0066] Table 1 shows the basic parameter table of the optical imaging system 100 of Example 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0067]

[0068]

[0069] Table 1

[0070] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0071]

[0072] where x is the sagitta distance from the vertex of the aspherical surface at the position with a height of h along the optical axis direction; 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 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 gives the higher-order term coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0073]

[0074]

[0075] Table 2

[0076] Figure 2A shows the axial chromatic aberration curve of the optical imaging system 100, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical imaging system 100. Figure 2B shows the astigmatism curve of the optical imaging system 100, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 2C shows the distortion curve of the optical imaging system 100, which represents the distortion magnitude values corresponding to different image heights. Figure 2D shows the longitudinal chromatic aberration curve of the optical imaging system 100, which represents the deviation of different image heights of light rays on the imaging plane after passing through the system. According to Figures 2A to 2D it can be seen that the optical imaging system 100 can achieve good imaging quality.

[0077] Example 2

[0078] The following refers to Figures 3 to 4D to describe the optical imaging system according to Embodiment 2 of the present application.

[0079] As Figure 3 shown, the optical imaging system 200 sequentially includes, from the object side to the image side along the optical axis: 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, and an eighth lens E8. The aperture stop STO can be disposed between the object side and the first lens E1 according to actual needs.

[0080] The first lens E1 has a positive refractive power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a negative refractive power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has a negative refractive power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has a positive refractive power, with its object side S7 being convex and its image side S8 being convex. The fifth lens E5 has a negative refractive power, with its object side S9 being concave and its image side S10 being convex. The sixth lens E6 has a negative refractive power, with its object side S11 being concave and its image side S12 being convex. The seventh lens E7 has a positive refractive power, with its object side S13 being convex and its image side S14 being concave. The eighth lens E8 has a negative refractive power, with its object side S15 being convex and its image side S16 being concave. The filter E9 has an object side S17 and an image side S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0081] Table 3 shows the basic parameter table of the optical imaging system 200 of Example 2, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0082]

[0083]

[0084] Table 3

[0085] In Example 2, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 4 gives 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 that can be used for the aspherical surfaces S1 - S16 in Example 2.

[0086] Surface number A4 A6 A8 A10 A12 A14 A16 S1 4.6799E-02 3.5585E-03 -1.9290E-03 -1.4773E-03 -6.9666E-04 -3.2342E-04 -1.3580E-04 S2 -1.1077E-02 3.0465E-03 -3.6985E-03 -1.3374E-04 -5.4059E-04 -6.6992E-05 -5.5306E-05 S3 -8.8002E-02 2.6654E-02 1.9719E-03 1.2481E-03 -2.3336E-04 6.2636E-05 -8.6315E-06 S4 -3.8188E-02 2.3298E-02 7.2994E-03 2.7540E-03 7.3334E-04 2.1721E-04 3.1884E-05 S5 -1.7321E-01 2.2131E-04 3.7165E-03 4.6414E-04 -5.0900E-04 -2.4179E-04 -1.1732E-04 S6 -2.0724E-01 2.1333E-02 3.7889E-03 -1.3316E-03 -1.4789E-03 -3.8415E-04 -1.9338E-04 S7 -2.3506E-01 2.0046E-02 5.5318E-03 3.9415E-03 1.8148E-03 4.9379E-04 -3.4625E-04 S8 -4.3768E-01 1.6472E-02 8.2255E-03 7.7788E-03 5.3212E-03 2.3349E-03 7.7745E-04 S9 -5.3136E-01 1.2654E-01 2.0933E-02 -5.1847E-03 -1.5244E-03 -1.1139E-03 -1.1338E-04 S10 -5.4304E-01 2.2765E-02 4.3218E-02 5.0598E-03 -1.9570E-03 -1.3916E-03 -6.9761E-04 S11 3.9077E-01 -1.4721E-01 4.1404E-02 1.4819E-02 -5.0293E-04 3.3438E-03 -3.2383E-05 S12 1.8017E-01 2.1229E-01 -3.7980E-02 7.0689E-03 -7.0131E-03 3.5256E-03 9.4992E-04 S13 -2.4871E+00 5.2994E-02 1.6144E-01 -4.0685E-02 7.2867E-03 -2.9588E-03 1.1405E-02 S14 -8.9690E-01 -1.4040E-01 2.1594E-01 -1.5837E-01 7.3018E-02 -1.2886E-02 1.6846E-02 S15 -5.5419E+00 1.6550E+00 -5.8790E-01 1.9964E-01 -5.9505E-02 6.3605E-03 2.1948E-03 S16 -9.4103E+00 2.0397E+00 -6.9057E-01 3.1186E-01 -1.5612E-01 5.0321E-02 -2.9657E-02 Surface number A18 A20 A22 A24 A26 A28 A30 S1 -7.2172E-05 -2.6840E-05 -1.3874E-05 2.4735E-06 7.1204E-06 7.4034E-06 9.6591E-07 S2 -6.0309E-06 2.6323E-06 -2.9078E-06 7.9866E-06 4.6166E-06 9.9446E-06 -1.4238E-06 S3 4.0262E-05 9.0385E-06 9.8602E-06 -3.4319E-06 1.8666E-06 2.2501E-06 2.7444E-06 S4 1.0884E-06 -1.1065E-05 -6.9792E-06 -5.3210E-06 -4.3295E-06 -2.5847E-06 -1.5436E-06 S5 -5.6586E-05 -3.8752E-05 -1.7359E-05 -6.5620E-06 -1.1269E-07 1.0445E-07 2.9453E-06 S6 -1.0178E-04 -5.6587E-05 -1.1227E-05 7.2915E-07 2.5852E-06 -2.5726E-06 -1.0710E-06 S7 -4.0635E-04 -2.0689E-04 -4.4459E-05 1.7303E-05 2.1826E-05 8.7373E-06 -2.9954E-06 S8 1.1831E-04 -7.1562E-05 -8.4919E-05 -5.8135E-05 -3.2294E-05 -1.0792E-05 -3.1867E-06 S9 3.0656E-04 3.5346E-05 1.6984E-05 -4.7555E-05 -1.1913E-05 -2.7497E-06 3.4521E-06 S10 1.0241E-04 -1.8070E-04 1.3928E-04 6.7622E-07 1.1544E-05 -9.6320E-06 2.2374E-06 S11 9.8698E-04 -1.0720E-03 -1.9257E-04 -1.6989E-04 6.5239E-05 -2.1566E-05 2.5408E-05 S12 9.3094E-05 -1.0752E-03 1.3984E-04 2.2627E-04 -5.9334E-05 -9.8221E-05 4.1237E-05 S13 -4.8340E-03 -3.1560E-03 -1.2017E-03 1.6940E-03 2.3381E-04 -4.8313E-05 -6.6370E-05 S14 -1.0068E-02 2.5272E-03 -2.1914E-03 1.6965E-03 -9.5451E-04 3.7992E-04 -6.1862E-05 S15 -1.9387E-03 -2.5908E-03 1.6037E-03 1.8660E-04 -2.0744E-03 1.5669E-03 -5.9083E-04 S16 1.2638E-02 -8.3782E-03 1.1881E-03 -4.0697E-03 4.6646E-05 -5.3075E-04 1.0503E-04

[0087] Table 4

[0088] Figure 4A shows the axial chromatic aberration curve of the optical imaging system 200, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the optical imaging system 200. Figure 4B shows the astigmatism curve of the optical imaging system 200, which represents the meridional image plane curvature and the sagittal image plane curvature corresponding to different image heights. Figure 4CThe distortion curve of the optical imaging system 200 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 4D The longitudinal chromatic aberration curve of the optical imaging system 200 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. According to Figures 4A to 4D it can be seen that the optical imaging system 200 can achieve good imaging quality.

[0089] Example 3

[0090] The following refers to Figures 5 to 6D Describe the optical imaging system according to Embodiment 3 of the present application.

[0091] As Figure 5 shown, the optical imaging system 300 sequentially includes, from the object side to the image side along the optical axis: 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, and an eighth lens E8. The aperture stop STO can be arranged between the object side and the first lens E1 according to actual needs.

[0092] The first lens E1 has a positive refractive power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a negative refractive power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a negative refractive power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a positive refractive power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative refractive power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a negative refractive power, its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has a positive refractive power, its object side surface S13 is convex, and its image side surface S14 is convex. The eighth lens E8 has a negative refractive power, its object side surface S15 is convex, and its image side surface S16 is concave. The filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0093] Table 5 shows the basic parameter table of the optical imaging system 300 in Embodiment 3, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0094]

[0095] Table 5

[0096] In Embodiment 3, the object side surface and the image side surface of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 6 gives the high-order term coefficients A4, A6, A8, A 10 , A12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0097] Surface number A4 A6 A8 A10 A12 A14 A16 S1 5.1368E-02 3.4177E-03 -4.2220E-03 -3.2683E-03 -1.5618E-03 -6.9336E-04 -2.4282E-04 S2 -4.8808E-02 2.5311E-03 -7.5034E-03 -9.9765E-06 -5.5867E-04 6.4570E-05 -5.0383E-05 S3 -9.9346E-02 2.8998E-02 1.0390E-03 2.2650E-03 9.0908E-05 1.2667E-04 5.5986E-05 S4 -4.0367E-02 2.5322E-02 7.1504E-03 3.2642E-03 9.0416E-04 3.8336E-04 9.8188E-05 S5 -1.8930E-01 1.0095E-03 2.9320E-03 1.8237E-04 -5.2707E-04 -1.5415E-04 -7.2157E-05 S6 -2.1977E-01 2.3820E-02 4.8629E-03 -1.1116E-03 -1.1677E-03 -1.4411E-04 -1.1371E-04 S7 -2.1024E-01 1.6166E-02 5.7743E-03 3.5505E-03 1.6858E-03 6.7416E-04 -1.4668E-04 S8 -4.1438E-01 1.1247E-02 1.0560E-02 7.7629E-03 5.3387E-03 1.7869E-03 8.0081E-04 S9 -5.5896E-01 1.5639E-01 2.4648E-02 -9.6817E-03 -2.9008E-03 -2.2375E-03 1.7877E-04 S10 -5.3616E-01 4.9611E-02 6.3101E-02 -4.1009E-03 -4.8103E-03 -4.4468E-03 -8.8449E-04 S11 7.0419E-01 -1.5853E-01 8.2792E-02 1.3280E-02 3.3160E-03 8.5582E-04 -4.1295E-04 S12 1.1199E-01 2.5386E-01 -4.6072E-02 1.6382E-02 -1.0976E-02 3.6671E-03 -7.6771E-04 S13 -2.6592E+00 9.8322E-02 1.9180E-01 -5.9584E-02 1.3882E-02 -2.9413E-03 4.8832E-03 S14 -5.3874E-01 -1.8303E-01 2.4023E-01 -1.6907E-01 9.3459E-02 -1.7056E-02 1.6673E-02 S15 -5.4940E+00 1.5684E+00 -5.3365E-01 1.8102E-01 -4.8837E-02 7.2580E-03 -6.9013E-04 S16 -8.7027E+00 1.8305E+00 -5.8811E-01 2.6748E-01 -1.1979E-01 5.5440E-02 -2.8062E-02 Surface number A18 A20 A22 A24 A26 A28 A30 S1 -1.0432E-04 -2.8097E-05 -2.0035E-05 -1.4902E-06 1.2055E-05 1.8691E-05 9.4448E-06 S2 2.5104E-05 -1.1068E-05 4.8001E-06 -1.8622E-05 7.3658E-06 9.9314E-07 6.6313E-07 S3 2.3069E-05 2.4418E-05 -7.3435E-06 -3.9342E-06 -3.0458E-06 1.0729E-05 -2.6356E-06 S4 5.6981E-05 4.6145E-06 1.3656E-05 -6.0234E-06 -6.2759E-07 -9.6844E-06 1.7220E-06 S5 -2.8561E-05 -3.7280E-05 -1.1400E-05 -1.2252E-05 -1.1235E-06 -4.8387E-06 2.2573E-06 S6 -9.3299E-05 -5.4426E-05 2.3791E-06 4.0194E-06 5.6504E-06 -3.5278E-06 4.4694E-07 S7 -3.1238E-04 -1.6412E-04 -1.9456E-05 1.8715E-05 2.6706E-05 3.5851E-06 -5.4407E-06 S8 -3.5184E-05 -3.5959E-05 -8.8175E-05 -2.2353E-05 -4.7780E-05 1.6755E-07 -1.2659E-05 S9 -6.3778E-05 -2.6615E-04 -1.9441E-04 -1.9019E-04 -7.4481E-06 2.4076E-05 1.6019E-05 S10 -5.7847E-04 -2.5962E-04 1.2584E-04 -1.0815E-04 -1.1128E-05 -1.9027E-05 -5.6301E-06 S11 6.7464E-04 -7.4511E-04 1.5910E-04 1.5565E-04 2.4086E-04 1.1099E-04 4.3377E-05 S12 4.3642E-04 -1.7829E-03 1.0954E-04 3.7690E-04 -1.1098E-04 -2.1335E-04 -1.0466E-04 S13 -1.0528E-02 -1.7746E-03 2.2039E-03 3.0685E-03 -1.0465E-03 -9.6748E-05 5.2414E-06 S14 -1.3184E-02 3.7174E-03 -1.7175E-03 4.4781E-03 -3.3402E-03 4.1511E-04 -7.1795E-04 S15 -3.5270E-04 6.2747E-04 7.8306E-04 -1.4110E-03 -2.4756E-03 1.8661E-03 -4.2324E-03 S16 1.3834E-02 -6.5464E-03 4.3515E-03 -1.0709E-03 1.7013E-03 -1.6206E-04 2.9122E-04

[0098] Table 6

[0099] Figure 6A shows the axial chromatic aberration curve of the optical imaging system 300, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical imaging system 300. Figure 6B shows the astigmatism curve of the optical imaging system 300, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 6C shows the distortion curve of the optical imaging system 300, which represents the distortion magnitude values corresponding to different image heights. Figure 6D shows the longitudinal chromatic aberration curve of the optical imaging system 300, which represents the deviation of different image heights of light rays on the imaging plane after passing through the system. According to Figures 6A to 6D it can be seen that the optical imaging system 300 can achieve good imaging quality.

[0100] Example 4

[0101] The following refers to Figures 7 to 8D to describe the optical imaging system according to Embodiment 4 of the present application.

[0102] As Figure 7 shown, the optical imaging system 400 sequentially includes, from the object side to the image side along the optical axis: 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, and an eighth lens E8. The aperture stop STO can be disposed between the object side and the first lens E1 according to actual needs.

[0103] The first lens E1 has a positive refractive power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a negative refractive power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has a negative refractive power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has a positive refractive power, with its object side S7 being convex and its image side S8 being convex. The fifth lens E5 has a negative refractive power, with its object side S9 being concave and its image side S10 being convex. The sixth lens E6 has a negative refractive power, with its object side S11 being concave and its image side S12 being convex. The seventh lens E7 has a positive refractive power, with its object side S13 being convex and its image side S14 being convex. The eighth lens E8 has a negative refractive power, with its object side S15 being convex and its image side S16 being concave. The filter E9 has an object side S17 and an image side S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0104] Table 7 shows the basic parameter table of the optical imaging system 400 of Example 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0105]

[0106] Table 7

[0107] In Example 4, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 8 gives 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 the aspherical mirror surfaces S1 - S16 in Example 4.

[0108]

[0109]

[0110] Table 8

[0111] Figure 8A shows the axial chromatic aberration curve of the optical imaging system 400, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the optical imaging system 400. Figure 8B shows the astigmatism curve of the optical imaging system 400, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 8CThe distortion curve of the optical imaging system 400 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 8D The longitudinal chromatic aberration curve of the optical imaging system 400 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the system. According to Figures 8A to 8D it can be seen that the optical imaging system 400 can achieve good imaging quality.

[0112] Example 5

[0113] The following refers to Figures 9 to 10D describe the optical imaging system according to Embodiment 5 of the present application.

[0114] As Figure 9 shown, the optical imaging system 500 sequentially includes, from the object side to the image side along the optical axis: 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, and an eighth lens E8. The aperture stop STO can be disposed between the object side and the first lens E1 according to actual needs.

[0115] The first lens E1 has a positive refractive power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative refractive power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a negative refractive power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a positive refractive power, its object surface S7 is convex, and its image surface S8 is convex. The fifth lens E5 has a negative refractive power, its object surface S9 is concave, and its image surface S10 is convex. The sixth lens E6 has a negative refractive power, its object surface S11 is concave, and its image surface S12 is convex. The seventh lens E7 has a positive refractive power, its object surface S13 is convex, and its image surface S14 is convex. The eighth lens E8 has a negative refractive power, its object surface S15 is convex, and its image surface S16 is concave. The filter E9 has an object surface S17 and an image surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0116] Table 9 shows the basic parameter table of the optical imaging system 500 of Embodiment 5, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0117]

[0118] Table 9

[0119] In Embodiment 5, the object surface and the image surface of any one of the first lens E1 to the eighth lens E8 are both aspherical surfaces. Table 10 gives the higher-order term coefficients A4, A6, A8, A 10 , A12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0120]

[0121]

[0122] Table 10

[0123] Figure 10A shows the axial chromatic aberration curve of the optical imaging system 500, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical imaging system 500. Figure 10B shows the astigmatism curve of the optical imaging system 500, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 10C shows the distortion curve of the optical imaging system 500, which represents the distortion magnitude values corresponding to different image heights. Figure 10D shows the lateral chromatic aberration curve of the optical imaging system 500, which represents the deviation of different image heights on the imaging plane after the light rays pass through the system. According to Figures 10A to 10D it can be seen that the optical imaging system 500 can achieve good imaging quality.

[0124] Example 6

[0125] The following refers to Figures 11 to 12D to describe the optical imaging system according to Embodiment 6 of the present application.

[0126] As Figure 11 shown, the optical imaging system 600 sequentially includes, from the object side to the image side along the optical axis: 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, and an eighth lens E8. The aperture stop STO can be disposed between the object side and the first lens E1 according to actual needs.

[0127] The first lens E1 has a positive refractive power, with its object side S1 being convex and its image side S2 being concave. The second lens E2 has a negative refractive power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has a negative refractive power, with its object side S5 being convex and its image side S6 being concave. The fourth lens E4 has a positive refractive power, with its object side S7 being convex and its image side S8 being convex. The fifth lens E5 has a negative refractive power, with its object side S9 being concave and its image side S10 being convex. The sixth lens E6 has a negative refractive power, with its object side S11 being concave and its image side S12 being convex. The seventh lens E7 has a positive refractive power, with its object side S13 being convex and its image side S14 being convex. The eighth lens E8 has a negative refractive power, with its object side S15 being convex and its image side S16 being concave. The filter E9 has an object side S17 and an image side S18. Light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0128] Table 11 shows the basic parameter table of the optical imaging system 600 of Example 6, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0129]

[0130]

[0131] Table 11

[0132] In Example 6, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 12 gives 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 the aspherical surfaces S1 - S16 in Example 6.

[0133]

[0134]

[0135] Table 12

[0136] Figure 12A shows the axial chromatic aberration curve of the optical imaging system 600, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the optical imaging system 600. Figure 12BThe astigmatism curve of the optical imaging system 600 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature corresponding to different image heights. Figure 12C The distortion curve of the optical imaging system 600 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 12D The longitudinal chromatic aberration curve of the optical imaging system 600 is shown, which represents the deviation of different image heights on the imaging plane after the light passes through the system. According to Figures 12A to 12D it can be seen that the optical imaging system 600 can achieve good imaging quality.

[0137] Example 7

[0138] The following will refer to Figures 13 to 14D to describe the optical imaging system according to Embodiment 7 of the present application.

[0139] As Figure 13 shown, the optical imaging system 700 sequentially includes, from the object side to the image side along the optical axis: 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, and an eighth lens E8. The aperture stop STO can be disposed between the object side and the first lens E1 according to actual needs.

[0140] The first lens E1 has a positive refractive power, its object side surface S1 is a convex surface, and its image side surface S2 is a concave surface. The second lens E2 has a negative refractive power, its object side surface S3 is a convex surface, and its image side surface S4 is a concave surface. The third lens E3 has a negative refractive power, its object side surface S5 is a convex surface, and its image side surface S6 is a concave surface. The fourth lens E4 has a positive refractive power, its object side surface S7 is a convex surface, and its image side surface S8 is a convex surface. The fifth lens E5 has a negative refractive power, its object side surface S9 is a convex surface, and its image side surface S10 is a concave surface. The sixth lens E6 has a negative refractive power, its object side surface S11 is a concave surface, and its image side surface S12 is a convex surface. The seventh lens E7 has a positive refractive power, its object side surface S13 is a convex surface, and its image side surface S14 is a convex surface. The eighth lens E8 has a negative refractive power, its object side surface S15 is a convex surface, and its image side surface S16 is a concave surface. The filter E9 has an object side surface S17 and an image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0141] Table 13 shows the basic parameter table of the optical imaging system 700 of Embodiment 7, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0142]

[0143]

[0144] Table 13

[0145] In Embodiment 7, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces. Table 14 gives 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 for each of the aspherical mirror surfaces S1 - S16 in Embodiment 7.

[0146] Surface number A4 A6 A8 A10 A12 A14 A16 S1 6.0501E-02 1.7942E-05 -5.9847E-03 -3.5120E-03 -1.5999E-03 -8.4836E-04 -4.3450E-04 S2 -6.8657E-02 3.9292E-03 -8.8135E-03 1.2486E-04 -2.0697E-03 -1.1891E-04 -2.1413E-04 S3 -1.2070E-01 4.7178E-02 3.6726E-03 3.2987E-03 -6.0706E-04 5.9013E-04 1.8469E-04 S4 -3.0114E-02 4.2170E-02 1.2611E-02 4.9834E-03 1.6691E-03 1.1359E-03 6.9490E-04 S5 -2.7733E-01 -1.9935E-03 -1.2964E-03 -3.5320E-03 -2.1749E-03 -3.2859E-04 -2.0709E-06 S6 -3.2875E-01 3.4857E-02 -1.3642E-02 -1.6279E-02 -8.3632E-03 -3.0772E-03 -1.9596E-03 S7 -3.0816E-01 2.7925E-02 1.0738E-02 1.1775E-03 -5.1958E-03 -5.8689E-03 -4.3810E-03 S8 -5.8796E-01 3.1217E-02 1.6485E-02 1.1381E-02 2.7722E-03 -2.9888E-03 -3.6797E-03 S9 -6.6852E-01 2.2442E-01 2.2441E-02 -1.8272E-02 5.5788E-04 -1.2743E-03 1.0222E-03 S10 -5.6301E-01 2.0178E-03 5.6333E-02 5.3772E-03 3.1152E-03 -8.5132E-04 5.3921E-04 S11 7.1967E-01 -1.8299E-01 4.0683E-02 9.9114E-03 -8.5016E-04 1.7590E-03 -5.9693E-04 S12 -9.4286E-02 1.9050E-01 -3.2221E-02 1.2191E-02 -5.1292E-03 -6.9462E-04 -1.4734E-03 S13 -1.8995E+00 -1.4514E-01 1.1339E-01 -1.6079E-02 1.0726E-02 -1.1619E-02 2.5976E-03 S14 -1.9071E-01 -3.1625E-01 2.9109E-01 -1.5012E-01 4.9442E-02 -2.3885E-02 1.3564E-02 S15 -4.2642E+00 1.0353E+00 -2.6654E-01 5.3115E-02 -5.1027E-03 1.5244E-04 -1.9870E-03 S16 -8.7840E+00 1.8540E+00 -6.4386E-01 2.6025E-01 -1.0748E-01 4.6789E-02 -2.1152E-02 Surface number A18 A20 A22 A24 A26 A28 A30 S1 -2.7954E-04 -1.7539E-04 -1.2537E-04 -7.9597E-05 -6.0942E-05 -2.5823E-05 -3.5364E-06 S2 -1.8938E-05 -4.0839E-05 1.5848E-05 -8.5256E-06 1.4953E-06 -1.4248E-05 1.9786E-06 S3 1.3606E-04 6.1248E-05 7.8096E-05 4.5859E-05 5.8359E-05 3.9991E-05 2.6559E-05 S4 4.2365E-04 2.2706E-04 1.2437E-04 5.2509E-05 3.7013E-05 1.6521E-05 7.5193E-06 S5 3.5487E-05 -9.5592E-06 1.2643E-05 5.7593E-06 3.5892E-05 3.9593E-05 3.5365E-05 S6 -8.8368E-04 -2.3051E-04 1.3382E-04 1.6134E-04 1.7300E-04 1.0191E-04 6.5956E-05 S7 -2.1028E-03 -8.2694E-04 -4.2679E-04 -3.7475E-04 -2.7149E-04 -1.6851E-04 -6.3627E-05 S8 -2.5332E-03 -1.2069E-03 -2.8282E-04 7.4016E-05 2.0602E-04 1.5130E-04 8.7801E-05 S9 2.1056E-04 -2.0951E-04 -1.0123E-04 1.2152E-05 4.4018E-05 1.0762E-05 -2.8794E-05 S10 5.0999E-04 -2.9976E-04 3.7350E-06 -6.7730E-05 -4.5130E-05 -9.8162E-06 9.5226E-06 S11 1.5998E-03 -7.7113E-04 -2.7909E-04 3.2523E-05 1.7393E-04 7.4719E-05 4.5946E-05 S12 7.4368E-04 5.2063E-05 -9.3529E-05 7.1730E-04 1.8587E-04 7.0040E-06 -1.1922E-04 S13 4.7731E-04 1.5900E-03 -1.2685E-03 3.5279E-05 -3.3948E-04 -5.5946E-05 -5.8350E-05 S14 -5.9152E-03 2.5168E-03 -2.9376E-03 1.4208E-03 -6.0496E-04 2.5251E-04 -1.0868E-04 S15 1.3024E-03 2.6758E-03 -2.8393E-03 7.2618E-04 -3.8400E-04 -4.3786E-04 -1.7652E-04 S16 1.0359E-02 -4.5636E-03 2.6017E-03 -4.9066E-04 5.5492E-04 1.0782E-04 1.0289E-04

[0147] Table 14

[0148] Figure 14A shows the axial chromatic aberration curve of the optical imaging system 700, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the optical imaging system 700. Figure 14B shows the astigmatism curve of the optical imaging system 700, which represents the curvature of the meridional image plane and the sagittal image plane corresponding to different image heights. Figure 14C shows the distortion curve of the optical imaging system 700, which represents the distortion magnitude values corresponding to different image heights. Figure 14D shows the longitudinal chromatic aberration curve of the optical imaging system 700, which represents the deviation of different image heights on the imaging plane after the light rays pass through the system. According to Figures 14A to 14D , it can be seen that the optical imaging system 700 can achieve good imaging quality.

[0149] Table 15 schematically shows some basic parameters in Embodiments 1 to 7.

[0150] Parameter / Example 1 2 3 4 5 6 7 f (mm) 7.21 7.10 7.19 7.46 8.88 8.68 8.58 TTL (mm) 8.95 8.62 8.93 8.99 10.98 10.47 10.46 ImgH (mm) 6.38 6.38 5.95 6.38 7.66 7.66 7.66 Semi - FOV (°) 41.23 39.54 36.73 37.89 38.46 36.35 36.39 Fno 1.76 1.76 1.76 1.80 1.76 1.76 1.76 BFL (mm) 2.95 2.55 3.03 3.02 3.38 3.15 3.23 f12 (mm) 11.19 10.00 11.09 10.52 12.63 13.25 13.47 f78 (mm) 13.99 23.28 13.20 15.58 16.80 16.52 17.79 SAG61 (mm) -0.77 -0.78 -0.64 -0.65 -0.91 -0.68 -0.69 SAG62 (mm) -0.92 -0.80 -0.85 -0.83 -0.99 -0.82 -0.93 ET7 (mm) 0.34 0.35 0.31 0.40 0.48 0.50 0.55

[0151] Table 15

[0152] In summary, the conditions in Embodiments 1 to 7 satisfy the relationships shown in Table 16.

[0153] Condition / Example 1 2 3 4 5 6 7 tan(Semi - FOV)×f 6.32 5.86 5.37 5.80 7.05 6.39 6.32 f6 / f -4.52 -10.35 -4.19 -4.12 -3.15 -2.80 -3.54 (R11 + R12) / (R11 - R12) -9.15 -15.74 -8.71 -8.39 -7.18 -6.19 -7.83 f4 / f 1.89 2.37 2.16 2.69 2.45 2.20 2.35 R7 / R8 -3.22 -2.30 -1.91 -0.53 -1.91 -3.09 -3.73 T34 / T67 3.80 2.27 2.23 2.13 2.20 2.70 2.92 (R1 + R2) / (R3 + R4) 1.30 1.90 1.37 1.26 1.40 1.48 1.45 R5 / R6 1.07 1.10 1.11 1.06 1.07 1.01 1.03 TTL / ImgH 1.40 1.35 1.50 1.41 1.43 1.37 1.37 f12 / (f1 + f2) -0.79 -1.15 -0.90 -0.72 -0.75 -1.02 -1.08 BFL / T78 12.17 8.81 30.30 13.85 11.37 6.76 10.20 SAG62 / CT6 + SAG61 / T56 -4.00 -3.77 -3.50 -3.50 -3.96 -2.95 -3.50 f7 / f8 -0.78 -0.91 -0.73 -0.82 -0.79 -0.82 -0.85 f78 / (R13 + R15) 2.42 3.97 1.99 2.72 2.45 2.38 2.52 ET7 / CT7 0.69 0.69 0.78 0.88 0.86 0.91 1.00 T56 / CT5 0.86 0.93 0.94 0.84 0.40 1.02 0.90 T78 / T67 4.85 2.87 1.00 2.09 2.97 4.65 3.17

[0154] Table 16

[0155] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. 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, but 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) disclosed in the present application that have similar functions.

Claims

1. An optical imaging system, characterized in that, It sequentially includes from the object side to the image side along the optical axis: A first lens, whose effective focal length is greater than zero, and the curvature radii of both the object side surface and the image side surface are greater than zero; A second lens, whose effective focal length is less than zero, and the curvature radii of both the object side surface and the image side surface are greater than zero; A third lens, whose effective focal length is less than zero, and the curvature radii of both the object side surface and the image side surface are greater than zero; A fourth lens, whose effective focal length is greater than zero, the curvature radius of the object side surface is greater than zero, and the curvature radius of the image side surface is less than zero; A fifth lens, whose effective focal length is less than zero; A sixth lens, whose effective focal length is less than zero, and the curvature radii of both the object side surface and the image side surface are less than zero; A seventh lens, whose effective focal length is greater than zero, and the curvature radius of the object side surface is greater than zero; and An eighth lens, whose effective focal length is less than zero, and the curvature radii of both the object side surface and the image side surface are greater than zero; The number of lenses in the optical imaging system is eight, wherein, the curvature radius R12 of the image side surface of the sixth lens is less than the curvature radius R11 of the object side surface of the sixth lens, and the curvature radius R11 of the object side surface of the sixth lens is less than -2 mm, The total effective focal length f of the optical imaging system and half of the maximum field of view angle Semi-FOV of the optical imaging system satisfy: 5.37 mm ≤ tan(Semi-FOV) × f ≤ 7.05 mm, and The on-axis distance BFL from the image side surface of the eighth lens to the imaging surface of the optical imaging system and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 6.76 ≤ BFL / T78 ≤ 30.

30.

2. The optical imaging system according to claim 1, characterized in that, The effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging system satisfy: -10.35 ≤ f6 / f ≤ -2.

80.

3. The optical imaging system according to claim 1, wherein The curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -15.74 ≤ (R11 + R12) / (R11 - R12) ≤ -6.

19.

4. The optical imaging system according to claim 1, characterized in that, The effective focal length f4 of the fourth lens and the total effective focal length f of the optical imaging system satisfy: 1.89 ≤ f4 / f ≤ 2.69, and the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -3.73 ≤ R7 / R8 ≤ -0.

53.

5. The optical imaging system according to claim 1, characterized in that, The air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy: 2.13 ≤ T34 / T67 ≤ 3.

80.

6. The optical imaging system according to claim 1, wherein 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, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 1.26 ≤ (R1 + R2) / (R3 + R4) ≤ 1.90, and the curvature radius R5 of the object side surface of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 1.01 ≤ R5 / R6 ≤ 1.

11.

7. 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 of the optical imaging system and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging system satisfy: 1.35 ≤ TTL / ImgH ≤ 1.

5.

8. The optical imaging system according to claim 1, wherein, The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy: -1.15 ≤ f12 / (f1 + f2) ≤ -0.

72.

9. The optical imaging system according to claim 1, wherein The maximum value maxNa of the refractive indices of all the lenses from the first lens to the third lens and the maximum value maxNb of the refractive indices of all the lenses from the sixth lens to the eighth lens satisfy: maxNa > maxNb.

10. The optical imaging system according to claim 1, characterized in that, The Abbe number V1 of the first lens, the Abbe number V2 of the second lens, the Abbe number V7 of the seventh lens, and the Abbe number V8 of the eighth lens satisfy: V1 + V2 < V7 + V8.

11. The optical imaging system according to claim 1, characterized in that, The on-axis distance SAG61 from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective semi-aperture of the object side surface of the sixth lens, the on-axis distance SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective semi-aperture of the image side surface of the sixth lens, the central thickness CT6 of the sixth lens on the optical axis, and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: -4.00 ≤ SAG62 / CT6 + SAG61 / T56 ≤ -2.

95.

12. The optical imaging system according to claim 1, wherein The effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: -0.91 ≤ f7 / f8 ≤ -0.73, and the combined focal length f78 of the seventh lens and the eighth lens, the radius of curvature R13 of the object side surface of the seventh lens, and the radius of curvature R15 of the object side surface of the eighth lens satisfy: 1.99 ≤ f78 / (R13 + R15) ≤ 3.

97.

13. The optical imaging system according to any one of claims 1 to 12, characterized in that, The central thickness CT7 of the seventh lens on the optical axis and the edge thickness ET7 of the seventh lens satisfy: 0.69 ≤ ET7 / CT7 ≤ 1.

14. The optical imaging system according to any one of claims 1 to 12, characterized in that, The central thickness CT5 of the fifth lens on the optical axis and the air gap T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.40 ≤ T56 / CT5 ≤ 1.

02.

15. The optical imaging system according to any one of claims 1 to 12, characterized in that, The air gap T67 between the sixth lens and the seventh lens on the optical axis and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 1 ≤ T78 / T67 ≤ 4.85.

Images