Camera system

Abstract

The application discloses a camera system, which comprises a lens barrel, an eight-piece lens group and a spacer element group arranged in the lens barrel. The eight-piece lens group comprises, in order from the object side to the image side along the optical axis, a first lens, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The air gap of the seventh lens and the eighth lens on the optical axis is greater than the air gap of any two adjacent lenses among the first lens to the seventh lens on the optical axis. The spacer element group comprises a sixth spacer element arranged on and in contact with the image side surface of the sixth lens and a seventh spacer element arranged on and in contact with the image side surface of the seventh lens. The total effective focal length f of the camera system, half of the maximum field angle Semi-FOV of the camera system, the outer diameter D6m of the image side surface of the sixth spacer element and the outer diameter D7m of the image side surface of the seventh spacer element satisfy the following formula: 2 < tan (Semi-FOV) x f / (D7m - D6m) < 23.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical devices, in particular to an eight-piece camera system. BACKGROUND

[0002] With the rapid development of portable electronic devices such as smart phones, the imaging requirements of the camera systems of the portable electronic devices such as smart phones are becoming more and more stringent. For example, through optical design of the camera system, the optical system meets the requirement of large field of view.

[0003] In order to meet the requirement of large field of view, the camera system is usually provided in the form of an eight-piece lens structure. In the eight-piece camera system, the camera system cannot be miniaturized due to the long total optical length, and there is a large gap structure between the sixth lens and the seventh lens. The large gap structure between the sixth lens and the seventh lens can cause poor assembly stability of the camera system, thereby affecting the product competitiveness of the camera system. SUMMARY

[0004] The present application provides a camera system which can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0005] An aspect of the present application provides a camera system, which includes a lens barrel, and an eight-piece lens group and a spacer element group arranged in the lens barrel. The eight-piece lens group includes, in order from an object side to an image side along an optical axis, a first lens, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The object side surface of the sixth lens is a concave surface. The air gap of the seventh lens and the eighth lens on the optical axis is greater than the air gap of any two adjacent lenses among the first lens to the seventh lens on the optical axis. The spacer element group includes a sixth spacer element arranged on and in contact with the image side surface of the sixth lens, and a seventh spacer element arranged on and in contact with the image side surface of the seventh lens. The total effective focal length f of the camera system, half of the maximum field of view angle Semi-FOV of the camera system, the outer diameter D6m of the image side surface of the sixth spacer element, and the outer diameter D7m of the image side surface of the seventh spacer element satisfy: 2 < tan(Semi-FOV) x f / (D7m-D6m) < 23.

[0006] According to an example embodiment of the present application, the curvature radius R11 of the object side surface of the sixth lens, the center thickness CT7 of the seventh lens on the optical axis, and the maximum thickness CP6 of the sixth spacer element satisfy: -24 < R11 / (CP6+CT7) < -5.

[0007] According to one example embodiment of the present application, the seventh lens has a positive refractive power, the eighth lens has a negative refractive power, and the effective focal length f7 of the seventh lens, the effective focal length f8 of the eighth lens, the outer diameter D7s of the object side surface of the seventh spacer element, and the inner diameter d7m of the image side surface of the seventh spacer element satisfy: 0 < (f7 + f8) / (D7s - d7m) < 12.

[0008] According to one example embodiment of the present application, the radius of curvature R13 of the object side surface of the seventh lens, the radius of curvature R16 of the image side surface of the eighth lens, the air interval T78 of the seventh lens and the eighth lens on the optical axis, and the interval EP67 of the sixth spacer element and the seventh spacer element along the optical axis satisfy: -3 < (R13 - R16) / (T78 - EP67) < 0.

[0009] According to one example embodiment of the present application, the effective focal length f6 of the sixth lens, the radius of curvature R14 of the image side surface of the seventh lens, the inner diameter d6s of the object side surface of the sixth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element satisfy: -15 < (f6 x d6s) / (R14 x d6m) < 0.

[0010] According to one example embodiment of the present application, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, the length L of the lens barrel in the direction of the optical axis, and the F number Fno of the imaging system satisfy: 0 < (D0m + D0s) x Fno / L < 10.

[0011] According to one example embodiment of the present application, the spacer element group further includes a fourth spacer element disposed on and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed on and in contact with the image side surface of the fifth lens, and wherein the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens, the outer diameter D4m of the image side surface of the fourth spacer element, and the outer diameter D5s of the object side surface of the fifth spacer element satisfy: 0 < (R9 / D4m) x (R10 / D5s) < 40.

[0012] According to one example embodiment of the present application, the spacer element group further includes a fourth spacer element disposed on and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed on and in contact with the image side surface of the fifth lens, and wherein the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens, the inner diameter d4s of the object side surface of the fourth spacer element, the inner diameter d5s of the object side surface of the fifth spacer element, and the inner diameter d6s of the object side surface of the sixth spacer element satisfy: -5 < f456 / (d4s + d5s + d6s) < 0, d4s < d5s < d6s.

[0013] According to an exemplary embodiment of the present application, the set of spacer elements further includes a fifth spacer element disposed on and in contact with the image side surface of the fifth lens, wherein the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, and the interval EP56 of the fifth and sixth spacer elements along the optical axis satisfy: -28 < (f5 + f6) / (EP56 x (V5 + V6)) < -5.

[0014] According to an exemplary embodiment of the present application, the set of spacer elements further includes a third spacer element disposed on and in contact with the image side surface of the third lens, wherein the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the inner diameter d3s of the object side surface of the third spacer element, and the outer diameter D3s of the object side surface of the third spacer element satisfy: 2 < (R5 - R6) / (D3s - d3s) < 12.

[0015] According to an exemplary embodiment of the present application, the set of spacer elements further includes a second spacer element disposed on and in contact with the image side surface of the second lens and a third spacer element disposed on and in contact with the image side surface of the third lens, wherein the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the air interval T23 of the second and third lenses along the optical axis, the central thickness CT3 of the third lens along the optical axis, the maximum thickness CP2 of the second spacer element, and the interval EP23 of the second and third spacer elements along the optical axis satisfy: 35 < (f2 - f3) / (CP2 + EP23 + T23 + CT3) < 65.

[0016] According to an exemplary embodiment of the present application, the set of spacer elements further includes a second spacer element disposed on and in contact with the image side surface of the second lens, wherein the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the inner diameter d2s of the object side surface of the second spacer element, and the outer diameter D2m of the image side surface of the second spacer element satisfy: 3 < (R5 / R4 + R6 / R3) x (D2m / d2s) < 12.

[0017] According to an exemplary embodiment of the present application, the set of spacer elements further includes a first spacer element disposed on and in contact with the image side surface of the first lens, wherein the effective focal length f1 of the first lens, the inner diameter d0s of the object side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, and the interval EP01 of the object side end surface of the lens barrel and the first spacer element along the optical axis satisfy: 0 < (d0s + D0s) / (f1 - EP01) < 3.

[0018] According to an example embodiment of the present application, the spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens, a second spacer element disposed on and in contact with the image side surface of the second lens, and a third spacer element disposed on and in contact with the image side surface of the third lens, wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the inner diameter d3s of the object side surface of the third spacer element satisfy: f1 / d1s < f2 / d2s < 10, -10 < f3 / d3s < -4, and d3s < d2s < d1s.

[0019] According to an example embodiment of the present application, the spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens, a second spacer element disposed on and in contact with the image side surface of the second lens, and a third spacer element disposed on and in contact with the image side surface of the third lens, wherein the combined focal length f123 of the first lens, the second lens, and the third lens, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the interval EP12 along the optical axis of the first spacer element and the second spacer element, and the interval EP23 along the optical axis of the second spacer element and the third spacer element satisfy: 40 < f123 x (N1 + N2 + N3) / (EP12 + EP23) < 50.

[0020] According to an example embodiment of the present application, the spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens, and a second spacer element disposed on and in contact with the image side surface of the second lens, wherein the effective focal length f1 of the first lens, the Abbe number V1 of the first lens, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the interval EP12 along the optical axis of the first spacer element and the second spacer element satisfy: 10 < V1 x (CT1 + EP12 + CT2) / f1 < 17.

[0021] According to an example embodiment of the present application, the spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens, wherein 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, the outer diameter D1s of the object side surface of the first spacer element, and the inner diameter d1m of the image side surface of the first spacer element satisfy: 0 < (R1 + R2) / (D1s - d1m) < 10.

[0022] The eight-piece camera system provided in the application meets the characteristics of a large field of view while constraining the total effective focal length of the camera system, the outer diameter of the image side of the sixth spacer element, and the outer diameter of the image side of the seventh spacer element, ensuring that the optical total length of the camera system fluctuates within a certain range, thereby realizing the miniaturization of the camera system, and also realizing a large step difference transition of the sixth lens and the seventh lens, so that the sixth lens and the seventh lens stably abut, improving the assembly stability of the camera system. BRIEF DESCRIPTION OF DRAWINGS

[0023] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the following drawings:

[0024] Figure 1 A structural schematic diagram of a camera system according to the application is shown;

[0025] Figure 2 A structural schematic diagram of a camera system according to embodiment 1 of the first embodiment of the application is shown;

[0026] Figure 3 A structural schematic diagram of a camera system according to embodiment 2 of the first embodiment of the application is shown;

[0027] Figure 4 A structural schematic diagram of a camera system according to embodiment 3 of the first embodiment of the application is shown;

[0028] Figures 5A to 5D Axial chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the camera system according to the first embodiment of the application are shown respectively;

[0029] Figure 6 A structural schematic diagram of a camera system according to embodiment 1 of the second embodiment of the application is shown;

[0030] Figure 7 A structural schematic diagram of a camera system according to embodiment 2 of the second embodiment of the application is shown;

[0031] Figure 8 A structural schematic diagram of a camera system according to embodiment 3 of the second embodiment of the application is shown;

[0032] Figures 9A to 9D Axial chromatic aberration curves, astigmatism curves, distortion curves, and magnification chromatic aberration curves of the camera system according to the second embodiment of the application are shown respectively;

[0033] Figure 10 A structural schematic diagram of a camera system according to embodiment 1 of the third embodiment of the application is shown;

[0034] Figure 11 A structural diagram of an imaging system according to Embodiment 2 of the third embodiment of the present application is shown.

[0035] Figure 12 A structural diagram of an imaging system according to Embodiment 3 of the third embodiment of the present application is shown.

[0036] Figures 13A to 13D An on-axis chromatic aberration curve, a distortion curve, a magnification chromatic aberration curve, and a stigmation curve of an imaging system according to the third embodiment of the present application are shown. DETAILED DESCRIPTION

[0037] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are merely descriptive of exemplary embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals will refer to like elements.

[0038] It should be noted that the terms first, second, third, etc. in the present specification are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0039] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical surface or the aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0040] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object side is referred to as the object side surface of the lens, and the surface of each lens closest to the image side is referred to as the image side surface of the lens.

[0041] It should also be understood that the terms "comprises", "comprising", "includes", "including", "has", "having", "contains", "containing", or the like, when used in this specification, indicate 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 groups thereof. Furthermore, when describing the embodiments of the present application, the use of "may" indicates that one or more embodiments of the present application. Also, the term "exemplary" is intended to mean an example or an 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 will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0043] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. 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 are described in detail below.

[0045] As shown in Figures 2 to 4 , Figures 6 to 8 and Figures 10 to 12 , the camera system according to the exemplary embodiments of the present application can include a lens barrel and an eight-piece lens group disposed in the lens barrel, the eight-piece lens group can include, in order from the object side to the image side along the optical axis, a first lens, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The object side surface of the sixth lens is a concave surface. Among the first lens to the eighth lens, an air gap can be present between any two adjacent lenses. Among them, the air gap of the seventh lens and the eighth lens on the optical axis is greater than the air gap of any two adjacent lenses among the first lens to the seventh lens on the optical axis.

[0046] The imaging system can further include a spacer element group disposed in the lens barrel, and the spacer element group can include a sixth spacer element and a seventh spacer element, wherein the sixth spacer element is disposed on and at least partially contacts an image-side surface of the sixth lens, and the seventh spacer element is disposed on and at least partially contacts an image-side surface of the seventh lens. In an example, the total effective focal length f of the imaging system, a half of the maximum field angle of the imaging system Semi-FOV, an outer diameter D6m of the image-side surface of the sixth spacer element, and an outer diameter D7m of the image-side surface of the seventh spacer element can satisfy: 2 < tan(Semi-FOV) x f / (D7m-D6m) < 23. As an example, 7 < tan(Semi-FOV) x f / (D7m-D6m) < 18. By controlling the above condition, the total effective focal length of the imaging system, the outer diameter of the image-side surface of the sixth spacer element, and the outer diameter of the image-side surface of the seventh spacer element are constrained while the imaging system satisfies the characteristics of a large field of view, the optical total length of the imaging system is ensured to fluctuate within a certain range, thereby realizing the miniaturization of the imaging system, and a large step transition of the sixth lens and the seventh lens can also be realized, so that the sixth lens and the seventh lens stably abut, and the assembly stability of the imaging system is improved.

[0047] In other examples, the spacer element group can further include one or more of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element. The first spacer element is disposed on and at least partially contacts an image-side surface of the first lens; the second spacer element is disposed on and at least partially contacts an image-side surface of the second lens; the third spacer element is disposed on and at least partially contacts an image-side surface of the third lens; the fourth spacer element is disposed on and at least partially contacts an image-side surface of the fourth lens; and the fifth spacer element is disposed on and at least partially contacts an image-side surface of the fifth lens. Reasonable use of the spacer element can effectively avoid stray light risk, reduce interference with image quality, and thereby improve the imaging quality of the imaging system.

[0048] In an example embodiment, a radius of curvature R11 of an object-side surface of the sixth lens, a center thickness CT7 of the seventh lens on the optical axis, and a maximum thickness CP6 of the sixth spacer element can satisfy: -24 < R11 / (CP6+CT7) < -5. In an example, -20 < R11 / (CP6+CT7) < -10. Controlling the above condition can limit the air gap of the sixth lens and the seventh lens on the optical axis within a reasonable range, avoid lens deformation or lens collision caused by changes in external conditions, effectively constrain the shape of the sixth lens and the seventh lens, improve the strength of the sixth lens and the seventh lens, and thereby improve the impact resistance of the imaging system.

[0049] In an example embodiment, the seventh lens has a positive refractive power, and the eighth lens has a negative refractive power. Moreover, the effective focal length f7 of the seventh lens, the effective focal length f8 of the eighth lens, the outer diameter D7s of the object side surface of the seventh spacer element, and the inner diameter d7m of the image side surface of the seventh spacer element can satisfy: 0 < (f7 + f8) / (D7s - d7m) < 12. In an example, 0.2 < (f7 + f8) / (D7s - d7m) < 7.8. By controlling the above conditional expression, the refractive power of the seventh lens can be positive, the refractive power of the eighth lens can be negative, the light propagation between the seventh lens and the eighth lens can be smoother, the energy loss of the light propagation between the two lenses can be minimized, and the overall performance of the imaging system can be improved.

[0050] In an example embodiment, the curvature radius R13 of the object side surface of the seventh lens, the curvature radius R16 of the image side surface of the eighth lens, the air gap T78 of the seventh lens and the eighth lens along the optical axis, and the interval EP67 of the sixth spacer element and the seventh spacer element along the optical axis can satisfy: -3 < (R13 - R16) / (T78 - EP67) < 0. In an example, -1.8 < (R13 - R16) / (T78 - EP67) < -0.6. By controlling the above conditional expression, the light propagation between the seventh lens and the eighth lens can be controlled, so that the light can accurately irradiate to the fixed position of the eighth lens after passing through the seventh lens, the probability of stray light generation can be reduced, and the image quality of the imaging system can be improved.

[0051] In an example embodiment, the effective focal length f6 of the sixth lens, the curvature radius R14 of the image side surface of the seventh lens, the inner diameter d6s of the object side surface of the sixth spacer element, and the inner diameter d6m of the image side surface of the sixth spacer element can satisfy: -15 < (f6 x d6s) / (R14 x d6m) < 0. In an example, -14 < (f6 x d6s) / (R14 x d6m) < -3. By controlling the above conditional expression, the light within a certain range can propagate along a fixed direction when passing through the sixth lens and the seventh lens, the number of light reflections in the mechanism can be reduced, the probability of stray light generation can be reduced, and the imaging quality of the imaging system can be improved.

[0052] In an example embodiment, the outer diameter D0s of the object side end surface of the lens barrel, the outer diameter D0m of the image side end surface of the lens barrel, the length L of the lens barrel in the direction of the optical axis, and the aperture number Fno of the imaging system satisfy: 0 < (D0m + D0s) x Fno / L < 10. In an example, 5 < (D0m + D0s) x Fno / L < 7. By controlling the above conditional expression, the object end surface size of the lens barrel and the aperture number of the imaging system can be constrained within a reasonable range, the imaging system can have sufficient light throughput, the overall image brightness of the imaging system can be improved, and the color of the image after imaging of the imaging system can be more saturated.

[0053] In exemplary embodiments, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens, the outer diameter D4m of the image side surface of the fourth spacer element, and the outer diameter D5s of the object side surface of the fifth spacer element can satisfy: 0 < (R9 / D4m) x (R10 / D5s) < 40. In examples, 4.5 < (R9 / D4m) x (R10 / D5s) < 37. By controlling the above conditional expression, the size of the fifth lens and the contact area of the fifth lens and the spacer elements adjacent thereto can be constrained within a reasonable range, the assembly stability of the fifth lens and the spacer elements is improved, and the overall quality of the imaging system is further improved.

[0054] In exemplary embodiments, the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens, the inner diameter d4s of the object side surface of the fourth spacer element, the inner diameter d5s of the object side surface of the fifth spacer element, and the inner diameter d6s of the object side surface of the sixth spacer element can satisfy: -5 < f456 / (d4s+d5s+d6s) < 0, d4s < d5s < d6s. In examples, -3.5 < f456 / (d4s+d5s+d6s) < -1.2. By controlling the above conditional expression, the ratio of the combined focal length of the fourth lens to the sixth lens to the sum of the inner diameters of the object side surfaces of the fourth spacer element to the sixth spacer element can be constrained within a reasonable range, ensuring the propagation of light between the fourth lens to the sixth lens to be coherent and consistent, while also allowing the light to propagate along a fixed path between the fourth lens to the sixth lens, reducing the risk of stray glare caused by the light being incident on the mechanism, and reducing the energy loss of the light during propagation, improving the performance quality of the imaging system.

[0055] In exemplary embodiments, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, and the interval EP56 of the fifth spacer element and the sixth spacer element along the optical axis can satisfy: -28 < (f5+f6) / (EP56 x (V5+V6)) < -5. By controlling the above conditional expression, the light passing through the imaging system has a small dispersion, and the energy loss of the light is minimized, ensuring that the imaging system has good imaging contrast and resolution, resulting in a full-color imaging screen and the best imaging effect.

[0056] In an example embodiment, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the inner diameter d3s of the object side surface of the third spacer element, and the outer diameter D3s of the image side surface of the third spacer element can satisfy: 2 < (R5-R6) / (D3s-d3s) < 12. In an example, 4 < (R5-R6) / (D3s-d3s) < 10. By controlling the above conditional expression, the mechanism size of the third lens can be limited, the mechanism size of the third lens satisfies the molding requirement in the case that the radius of curvature of the third lens satisfies the requirement, and the assembly bearing area is good, and the assembly stability of the imaging system is improved.

[0057] In an example embodiment, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the air interval T23 of the second lens and the third lens on the optical axis, the central thickness CT3 of the third lens on the optical axis, the maximum thickness CP2 of the second spacer element, and the interval EP23 of the second spacer element and the third spacer element along the optical axis can satisfy: 35 < (f2-f3) / (CP2+EP23+T23+CT3) < 65. By controlling the above conditional expression, the interval of the second spacer element and the third spacer element along the optical axis and the contact area of the second lens, the third lens and the adjacent spacer element can be constrained, the optical sensitive lens such as the second lens and the third lens has low structural sensitivity after assembly, and the assembly stability of the imaging system is improved.

[0058] In an example embodiment, the radius of curvature R3 of the object side surface of the second lens, the radius of curvature R4 of the image side surface of the second lens, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the inner diameter d2s of the object side surface of the second spacer element, and the outer diameter D2m of the image side surface of the second spacer element can satisfy: 3 < (R5 / R4+R6 / R3) x (D2m / d2s) < 12. In an example, 5 < (R5 / R4+R6 / R3) x (D2m / d2s) < 10. By controlling the above conditional expression, the ratio of the edge thickness and the central thickness of the second lens and the third lens can be constrained within a certain range, so that the thickness of each part of the second lens and the third lens is uniformly distributed, the molding property is optimal, and thus the second lens and the third lens have very high precision size.

[0059] In the example embodiment, the effective focal length f1 of the first lens, the inner diameter d0s of the object side end surface of the lens barrel, the outer diameter D0s of the object side end surface of the lens barrel, and the interval EP01 of the object side end surface of the lens barrel and the first spacer element along the optical axis can satisfy: 0 < (d0s + D0s) / (f1 - EP01) < 3. In an example, 1 < (d0s + D0s) / (f1 - EP01) < 1.8. By controlling the above conditional expression, the intensity of stray light generated by light rays irradiating the object side end surface of the lens barrel can be limited while ensuring that the imaging system has sufficient light flux, reducing the risk of the imaging system having low light intensity due to an unreasonable aperture of the object side end surface of the lens barrel, and improving the overall quality of the image of the imaging system.

[0060] In the example embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the inner diameter d3s of the object side surface of the third spacer element can satisfy: f1 / d1s < f2 / d2s < 10, -10 < f3 / d3s < -4, d3s < d2s < d1s. By controlling the above conditional expression, the ratio of the effective focal length of each lens in the first lens to the third lens to the inner diameter of the object side surface of the corresponding spacer element can be constrained within a reasonable range, so that the light flux of the imaging system is maintained at a stable level, and the exposure loss degree of light rays after refraction through the lens is minimized, ensuring that the capability of the imaging system is maintained at a high level, and the imaging image effect is optimal.

[0061] In the example embodiment, the combined focal length f123 of the first lens, the second lens, and the third lens, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the interval EP12 of the first spacer element and the second spacer element along the optical axis, and the interval EP23 of the second spacer element and the third spacer element along the optical axis can satisfy: 40 < f123 x (N1 + N2 + N3) / (EP12 + EP23) < 50. By controlling the above conditional expression, the distance traveled by light rays between the first lens, the second lens, and the third lens can conform to a certain gradient, and the deflection range of light rays when passing through each lens can be limited within a reasonable range, ensuring that the light rays propagate more smoothly between the first lens to the third lens, with less energy loss.

[0062] In the example embodiment, the effective focal length f1 of the first lens, the Abbe number V1 of the first lens, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the interval EP12 of the first interval element and the second interval element along the optical axis can satisfy: 10 < V1 x (CT1 + EP12 + CT2) / f1 < 17. By controlling the above condition, the thickness uniformity and the outer diameter size of the first lens can be optimized while ensuring smooth transition of the first bundle of light rays passing through refraction, thereby improving the formability of the first lens and the stability of mass production.

[0063] In the example 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, the outer diameter D1s of the object side surface of the first interval element, and the inner diameter d1m of the image side surface of the first interval element can satisfy: 0 < (R1 + R2) / (D1s - d1m) < 10. In an example, 2.5 < (R1 + R2) / (D1s - d1m) < 6.9. By controlling the above condition, the light ray aperture passing through the first interval element can be limited, the total light quantity of the imaging system can be constrained, and the imaging quality of the imaging system can be ensured to be maintained within a reasonable range, thereby avoiding a phenomenon of large image quality fluctuation and avoiding a strong stray light phenomenon of invalid light rays due to unshielding.

[0064] In the example embodiment, the imaging system can further include a diaphragm arranged between the object side and the first lens.

[0065] The imaging system according to the above embodiments of the present application can adopt eight lenses and multiple interval elements. By reasonably allocating the parameters of the lenses and the interval elements, the miniaturization of the imaging system can be achieved, the stray light risk of the imaging system can be reduced, and the assembly stability and the imaging quality of the imaging system can be improved.

[0066] In the embodiments of the present application, at least one of the mirror surfaces of the first lens to the eighth lens is a non-spherical mirror surface. The non-spherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens having a constant curvature from the center of the lens to the periphery of the lens, the non-spherical lens has better radius of curvature characteristics, has the advantages of improving the distortion aberration and improving the astigmatism aberration. After adopting the non-spherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Alternatively, the object side surface and the image side surface of each of the first lens to the eighth lens are non-spherical mirror surfaces.

[0067] However, those skilled in the art should understand that the number of lenses and interval elements constituting the imaging system can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification.

[0068] Specific embodiments of the camera system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0069] First embodiment

[0070] The following is for reference Figures 2 to 5D A camera system according to a first embodiment of this application is described. Figure 2 A schematic diagram of the camera system 110 according to Embodiment 1 of the first embodiment of this application is shown; Figure 3 A schematic diagram of the camera system 120 according to Embodiment 2 of the first embodiment of this application is shown; Figure 4 A schematic diagram of the camera system 130 according to Embodiment 3 of the first embodiment of this application is shown.

[0071] like Figures 2 to 4 As shown, imaging systems 110, 120, and 130 all include a lens barrel and an eight-element lens group and a spacer element group housed within the lens barrel. The eight-element lens group, from the object side to the image side, includes, in sequence: 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. An aperture stop STO can be positioned between the object side and the first lens E1. The spacer element group includes: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7. The spacer elements can block excess light during the imaging process from entering the next lens, allowing the lens to better contact the lens barrel and enhancing the structural stability of the imaging system.

[0072] The first lens E1 has positive refractive power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive refractive power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative refractive power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive refractive power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative refractive power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative refractive power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive refractive power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative refractive power, with its object-side surface S15 being concave and its image-side surface S16 being concave. The filter has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and finally forms an image on the imaging surface S19 (not shown).

[0073] Table 1 shows a basic parameter table of the camera system of the first embodiment, wherein the units of the radius of curvature, the thickness / distance and the focal length are all millimeters (mm).

[0074]

[0075] Table 1

[0076] In the present embodiment, the value of the total effective focal length f of the camera system is 7.88 mm, the value of the half of the maximum field of view angle Semi-FOV of the camera system is 46.24°, the value of the F-number Fno of the camera system is 1.896, the value of the combined focal length f123 of the first lens, the second lens and the third lens is 9.02 mm, and the value of the combined focal length f456 of the fourth lens, the fifth lens and the sixth lens is -32.99 mm.

[0077] In the first embodiment, the object side and the image side of any one of the first lens E1 to the eighth lens E8 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0078]

[0079] wherein x is the sag of the aspherical surface at a height h along the optical axis, c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the radius of curvature R in Table 1 above), k is the conic coefficient, and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 shows the high-order coefficients A4, A6, A8, A10 and A12 of the aspherical surfaces S1-S16 that can be used in the first embodiment. 10 12 14 16 18 20 22 24 26 28 30 .

[0080]

[0081]

[0082] Table 2

[0083] Figure 5A The on-axis chromatic aberration curves of the camera systems 110, 120 and 130 of the first embodiment are shown, which represent the convergence point deviation of light rays of different wavelengths after passing through the camera systems 110, 120 and 130. Figure 5B ​​​​​​​​​​Astigmatism curves of camera systems 110, 120, and 130 of the first embodiment are shown, representing the meridional and sagittal plane curvatures corresponding to different image heights. Figure 5C The distortion curves of the camera systems 110, 120 and 130 of the first embodiment are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 5D The magnification chromatic aberration curves of the imaging systems 110, 120, and 130 of the first embodiment are shown, representing the deviations in image height at different points on the imaging plane after light passes through the system. According to... Figures 5A to 5D It can be seen that the camera systems 110, 120 and 130 given in the first embodiment can achieve good imaging quality.

[0084] Second embodiment

[0085] The following is for reference Figures 6 to 9D A camera system according to a second embodiment of this application is described. Figure 6 A schematic diagram of the camera system 210 according to Embodiment 1 of the second embodiment of this application is shown; Figure 7 A schematic diagram of the camera system 220 according to Embodiment 2 of the second embodiment of this application is shown; Figure 8 A schematic diagram of the camera system 230 according to Embodiment 3 of the second embodiment of this application is shown.

[0086] like Figures 6 to 8 As shown, imaging systems 210, 220, and 230 all include a lens barrel and an eight-element lens group and a spacer element group housed within the lens barrel. The eight-element lens group, from the object side to the image side, includes, in sequence: 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. An aperture stop STO can be positioned between the object side and the first lens E1. The spacer element group includes: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7. The spacer elements can block excess light from entering the next lens during the imaging process, allowing the lens and lens barrel to better support each other and enhancing the structural stability of the imaging system.

[0087] The first lens E1 has positive refractive power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive refractive power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative refractive power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive refractive power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has negative refractive power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative refractive power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive refractive power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative refractive power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and finally forms an image on the imaging surface S19 (not shown).

[0088] Table 3 shows the basic parameters of the camera system according to the second embodiment, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0089]

[0090] Table 3

[0091] In this embodiment, the total effective focal length f of the camera system is 7.65 mm, the Semi-FOV (half of the maximum field of view) of the camera system is 41.19°, the aperture number Fno of the camera system is 1.896, the combined focal length f123 of the first lens, the second lens and the third lens is 9.04 mm, and the combined focal length f456 of the fourth lens, the fifth lens and the sixth lens is -21.90 mm.

[0092] In the second embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical. Table 4 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S16 in the second embodiment. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0093]

[0094] Table 4

[0095] Figure 9A The on-axis chromatic aberration curves of the camera systems 210, 220 and 230 of the second embodiment are shown, which represent the deflection of the focal point of light of different wavelengths after passing through the camera systems 210, 220 and 230. Figure 9B Astigmatism curves of camera systems 210, 220, and 230 according to the second embodiment are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 9C The distortion curves of the camera systems 210, 220 and 230 of the second embodiment are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 9D The magnification chromatic aberration curves of the imaging systems 210, 220, and 230 of the second embodiment are shown, representing the deviations in image height at different points on the imaging plane after light passes through the system. According to... Figures 9A to 9D It can be seen that the camera systems 210, 220 and 230 of the second embodiment can achieve good imaging quality.

[0096] Third embodiment

[0097] The following is for reference Figures 10 to 13D A camera system according to a third embodiment of this application is described. Figure 10 A schematic diagram of the camera system 310 according to Embodiment 1 of the third embodiment of this application is shown; Figure 11 A schematic diagram of the camera system 320 according to Embodiment 2 of the third embodiment of this application is shown; Figure 12 A schematic diagram of the camera system 330 according to Embodiment 3 of the third embodiment of this application is shown.

[0098] like Figures 10 to 12 As shown, imaging systems 310, 320, and 330 all include a lens barrel and an eight-element lens group and a spacer element group housed within the lens barrel. The eight-element lens group, from the object side to the image side, includes, in sequence: 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. An aperture stop STO can be positioned between the object side and the first lens E1. The spacer element group includes: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fifth spacer element P5, a sixth spacer element P6, and a seventh spacer element P7. The spacer elements can block excess light from entering the next lens during the imaging process, allowing the lens to better contact the lens barrel P0 and enhancing the structural stability of the imaging system.

[0099] The first lens E1 has positive refractive power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive refractive power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative refractive power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive refractive power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative refractive power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative refractive power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The seventh lens E7 has positive refractive power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative refractive power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter has an object-side surface S17 (not shown) and an image-side surface S18 (not shown). Light from the object passes sequentially through each surface S1 to S18 and finally forms an image on the imaging surface S19 (not shown).

[0100] Table 5 shows the basic parameters of the camera system according to the third embodiment, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0101]

[0102]

[0103] Table 5

[0104] In this embodiment, the total effective focal length f of the camera system is 7.53 mm, the Semi-FOV (half of the maximum field of view) of the camera system is 45.83°, the aperture number Fno of the camera system is 1.896, the combined focal length f123 of the first lens, the second lens and the third lens is 9.32 mm, and the combined focal length f456 of the fourth lens, the fifth lens and the sixth lens is -57.08 mm.

[0105] In the third embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical. Table 6 gives the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S16 in the third embodiment. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0106]

[0107]

[0108] Table 6

[0109] Figure 13A The on-axis chromatic aberration curves of the imaging systems 310, 320 and 330 of the third embodiment are shown, which represent the deviation of convergent focal points of light rays of different wavelengths after passing through the imaging systems 310, 320 and 330. Figure 13B The astigmatism curves of the imaging systems 310, 320 and 330 of the third embodiment are shown, which represent the meridional image surface curvature and sagittal image surface curvature corresponding to different image heights. Figure 13C The distortion curves of the imaging systems 310, 320 and 330 of the third embodiment are shown, which represent the distortion size values corresponding to different image heights. Figure 13D The lateral chromatic aberration curves of the imaging systems 310, 320 and 330 of the third embodiment are shown, which represent the deviation of different image heights on the imaging plane after the light rays pass through the systems. According to the lateral chromatic aberration curves, the lateral chromatic aberration of the imaging systems 310, 320 and 330 of the third embodiment is small. Figures 13A to 13D It can be seen that the imaging systems 310, 320 and 330 of the third embodiment can achieve good imaging quality.

[0110] Table 7 gives some basic parameters of the lens barrels and interval elements of the embodiments in the first embodiment to the third embodiment, such as d1s, d1m, D1s, d2s, D2m, d3s, D3s, d4s, D4m, d5s, D5s, d6s, d6m, D6m, d7m, D7s, D7m, d0s, D0s, D0m, EP01, EP12, CP2, EP23, EP56, CP6, EP67 and L, etc. The basic parameters listed in Table 7 are measured according to the labeling method shown in Table 7, and the units of the basic parameters listed in Table 7 are millimeters (mm). Figure 1 The basic parameters listed in Table 7 are measured according to the labeling method shown in Table 7, and the units of the basic parameters listed in Table 7 are millimeters (mm).

[0111]

[0112]

[0113] Table 7

[0114] In summary, the conditional expressions of the embodiments in the first embodiment to the third embodiment satisfy the relationships shown in Table 8.

[0115] Conditional expression / embodiment 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 tan(Semi-FOV) x f / (D7m-D6m) 17.74 17.74 8.72 7.32 7.32 7.32 13.24 13.24 8.91 R11 / (CP6+CT7) -10.86 -10.86 -10.86 -19.78 -19.78 -19.78 -18.56 -18.56 -18.56 (f7+f8) / (D7s-d7m) 7.63 7.63 2.20 0.31 0.31 0.31 2.49 2.49 1.24 (R13-R16) / (T78-EP67) -0.90 -0.90 -1.02 -1.58 -1.58 -1.58 -0.65 -0.65 -0.79 (f6 x d6s) / (R14 x d6m) -4.10 -4.10 -4.10 -3.11 -3.11 -3.11 -13.89 -13.89 -13.89 (DOm+D0s) x Fno / L 6.75 6.75 6.75 5.78 5.78 5.78 5.78 5.78 5.78 (R9 / D4m) x (R10 / D5s) 4.59 4.59 4.59 19.72 19.72 11.74 27.36 36.60 36.60 f456 / (d4s+d5s+d6s) -1.91 -1.91 -1.91 -1.39 -1.39 -1.42 -3.48 -3.48 -3.48 (f5+f6) / (EP56 x (V5+V6)) -24.97 -24.97 -24.97 -18.12 -18.12 -11.41 -6.35 -6.35 -6.35 (R5-R6) / (D3s-d3s) 9.99 9.99 9.99 8.88 8.88 8.88 4.54 8.16 8.16 (f2-f3) / (CP2+EP23+T23+CT3) 56.38 56.38 56.38 40.72 40.72 40.72 60.87 60.87 60.87 (R5 / R4+R6 / R3) x (D2m / d2s) 9.83 8.02 8.02 8.12 6.41 6.41 6.61 5.13 5.13 (D0s+D0s) / (f1-EP01) 1.36 1.36 1.36 1.28 1.28 1.28 1.37 1.37 1.37 f1 / d1s 2.57 2.57 2.57 2.63 2.63 2.63 2.47 2.47 2.47 f2 / d2s 5.89 5.89 5.89 4.86 4.86 4.86 8.15 8.15 8.15 f3 / d3s -7.91 -7.91 -7.91 -6.39 -6.39 -6.39 -8.20 -8.20 -8.20 f123 x (N1+N2+N3) / (EP12+EP23) 47.48 47.48 47.48 44.86 44.86 44.86 42.91 42.91 42.91 V1 x (CT1+EP12+CT2) / f1 15.09 15.09 15.09 12.58 12.58 12.58 13.64 13.64 13.64 (R1+R2) / (D1s-d1m) 2.94 5.35 5.35 3.10 6.24 6.24 3.10 6.64 6.64

[0116] Table 8

[0117] The application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a stand-alone imaging apparatus 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 camera system described above.

[0118] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combinations of the technical features described above or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above-described features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. A camera system, characterized in that, include: An eight-element lens group, consisting of the following elements sequentially along the optical axis from the object side to the image side: The first lens with positive refractive power has a convex object side and a concave image side. The second lens with positive refractive power has a convex object-side surface and a concave image-side surface; A third lens with negative refractive power has a convex object side and a concave image side. A fourth lens with positive refractive power; A fifth lens with negative refractive power; The sixth lens, which has negative refractive power, has a concave object-side surface. The seventh lens, which has positive refractive power, has a convex object-side surface and a concave image-side surface; The eighth lens, which has negative refractive power, has a concave image-side surface. A group of spacers includes a sixth spacer element disposed on and in contact with the image-side surface of the sixth lens, and a seventh spacer element disposed on and in contact with the image-side surface of the seventh lens; and The lens barrel, the eight-element lens group, and the spacer element group are placed inside the lens barrel. The number of lenses with refractive power in the imaging system is eight; The air gap between the seventh lens and the eighth lens on the optical axis is greater than the air gap between any two adjacent lenses from the first lens to the seventh lens on the optical axis; The total effective focal length f of the camera system, half of the maximum field of view (Semi-FOV) of the camera system, the outer diameter D6m of the image side of the sixth spacer element, and the outer diameter D7m of the image side of the seventh spacer element satisfy: 7.32≤tan(Semi-FOV)×f / (D7m-D6m)≤17.74; The radius of curvature R13 of the object side of the seventh lens, the radius of curvature R16 of the image side of the eighth lens, the air gap T78 between the seventh and eighth lenses on the optical axis, and the gap EP67 between the sixth and seventh spacer elements along the optical axis satisfy: -1.58≤(R13-R16) / (T78-EP67)≤-0.

65.

2. The camera system according to claim 1, characterized in that, The radius of curvature R11 of the object side of the sixth lens, the center thickness CT7 of the seventh lens on the optical axis and the maximum thickness CP6 of the sixth spacer element satisfy: -19.78≤R11 / (CP6+CT7)≤-10.

86.

3. The camera system according to claim 1, characterized in that, The seventh lens has positive refractive power, the eighth lens has negative refractive power, and the effective focal length f7 of the seventh lens, the effective focal length f8 of the eighth lens, the outer diameter D7s of the object side of the seventh spacer element, and the inner diameter d7m of the image side of the seventh spacer element satisfy: 0.31≤(f7+f8) / (D7s-d7m)≤7.

63.

4. The camera system according to claim 1, characterized in that, The effective focal length f6 of the sixth lens, the radius of curvature R14 of the image side of the seventh lens, the inner diameter d6s of the object side of the sixth spacer element, and the inner diameter d6m of the image side of the sixth spacer element satisfy: -13.89≤(f6×d6s) / (R14×d6m)≤-3.

11.

5. The camera system according to claim 1, characterized in that, The outer diameter D0s of the object-side end face of the lens barrel, the outer diameter D0m of the image-side end face of the lens barrel, the length L of the lens barrel in the direction of the optical axis, and the aperture number Fno of the imaging system satisfy the following condition: 5.78≤(D0m+D0s)×Fno / L≤6.

75.

6. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a fourth spacer element disposed on and in contact with the image-side surface of the fourth lens, and a fifth spacer element disposed on and in contact with the image-side surface of the fifth lens. Wherein, the radius of curvature R9 of the object side of the fifth lens, the radius of curvature R10 of the image side of the fifth lens, the outer diameter D4m of the image side of the fourth spacer element, and the outer diameter D5s of the object side of the fifth spacer element satisfy: 4.59≤(R9 / D4m)×(R10 / D5s)≤36.

60.

7. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a fourth spacer element disposed on and in contact with the image-side surface of the fourth lens, and a fifth spacer element disposed on and in contact with the image-side surface of the fifth lens. Wherein, the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens, the inner diameter d4s of the object-side surface of the fourth spacer element, the inner diameter d5s of the object-side surface of the fifth spacer element, and the inner diameter d6s of the object-side surface of the sixth spacer element satisfy: -3.5 < f456 / (d4s + d5s + d6s) ≤ -1.39, d4s <d5s<d6s。 8. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a fifth spacer element disposed on and in contact with the image-side surface of the fifth lens. Wherein, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the Abbe number V5 of the fifth lens, the Abbe number V6 of the sixth lens, and the spacing EP56 of the fifth and sixth spacers along the optical axis satisfy: -24.97≤(f5+f6) / (EP56×(V5+V6))≤-6.

35.

9. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a third spacer element disposed on and in contact with the image-side surface of the third lens. Wherein, the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the inner diameter d3s of the object side of the third spacer element, and the outer diameter D3s of the object side of the third spacer element satisfy: 4.54≤(R5-R6) / (D3s-d3s)<10.

10. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a second spacer element disposed on and in contact with the image-side surface of the second lens, and a third spacer element disposed on and in contact with the image-side surface of the third lens. Wherein, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the air gap T23 between the second lens and the third lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, the maximum thickness CP2 of the second spacer element and the gap EP23 between the second spacer element and the third spacer element along the optical axis satisfy: 40.72≤(f2-f3) / (CP2+EP23+T23+CT3)≤60.

87.

11. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a second spacer element disposed on and in contact with the image-side surface of the second lens. Wherein, the radius of curvature R3 of the object side of the second lens, the radius of curvature R4 of the image side of the second lens, the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the inner diameter d2s of the object side of the second spacer element and the outer diameter D2m of the image side of the second spacer element satisfy: 5.13≤(R5 / R4+R6 / R3)×(D2m / d2s)≤9.

83.

12. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a first spacer element disposed on and in contact with the image-side surface of the first lens. Wherein, the effective focal length f1 of the first lens, the inner diameter d0s of the object-side end face of the lens barrel, the outer diameter D0s of the object-side end face of the lens barrel, and the distance EP01 between the object-side end face of the lens barrel and the first spacer element along the optical axis satisfy: 1.28≤(d0s+D0s) / (f1-EP01)≤1.

37.

13. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a first spacer element disposed on and in contact with the image-side surface of the first lens, a second spacer element disposed on and in contact with the image-side surface of the second lens, and a third spacer element disposed on and in contact with the image-side surface of the third lens. Wherein, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter d1s of the object side surface of the first spacer element, the inner diameter d2s of the object side surface of the second spacer element, and the inner diameter d3s of the object side surface of the third spacer element satisfy: 2.47 ≤ f1 / d1s <f2 / d2s≤8.15,-8.20≤f3 / d3s≤-6.39,d3s<d2s<d1s。 14. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a first spacer element disposed on and in contact with the image-side surface of the first lens, a second spacer element disposed on and in contact with the image-side surface of the second lens, and a third spacer element disposed on and in contact with the image-side surface of the third lens. Wherein, the combined focal length f123 of the first lens, the second lens and the third lens, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the refractive index N3 of the third lens, the spacing EP12 of the first spacer element and the second spacer element along the optical axis and the spacing EP23 of the second spacer element and the third spacer element along the optical axis satisfy: 42.91≤f123×(N1+N2+N3) / (EP12+EP23)≤47.

48.

15. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a first spacer element disposed on and in contact with the image-side surface of the first lens, and a second spacer element disposed on and in contact with the image-side surface of the second lens. Wherein, the effective focal length f1 of the first lens, the Abbe number V1 of the first lens, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis and the spacing EP12 of the first spacer element and the second spacer element along the optical axis satisfy: 12.58≤V1×(CT1+EP12+CT2) / f1≤15.

09.

16. The camera system according to any one of claims 1 to 5, characterized in that, The spacer element group further includes a first spacer element disposed on and in contact with the image-side surface of the first lens. Wherein, the radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, the outer diameter D1s of the object side of the first spacer element and the inner diameter d1m of the image side of the first spacer element satisfy: 2.94≤(R1+R2) / (D1s-d1m)≤6.64.

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