Imaging system

Abstract

The application provides an imaging system. The imaging system comprises a first optical system and a second optical system. The first optical system comprises a first lens group, a second lens group and a third lens group, the second lens group of the first optical system is movably arranged on an optical axis to realize the change of the first optical system between a first object distance state and a second object distance state. The second optical system comprises a first lens group, a second lens group and a third lens group. 3.10 < FAG2 / Δf < 3.70 is met; 8.30 ≤ (FBG1+FAG1) / (FBG1-FAG1) ≤ 9.90 is met. The application solves the problem that the imaging system in the prior art is difficult to simultaneously consider the shooting requirements of infinity, macro and zoom functions.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an imaging system. Background Technology

[0002] With the widespread adoption of smartphones and the rapid development of imaging technology, users' demands for multifunctional mobile phone cameras and high-quality images are increasing. The size limitations of smartphones have become a major challenge in developing high-performance cameras; integrating more photographic functions within a limited space has become a technical hurdle. Traditional periscope telephoto lens designs largely meet the needs of long-distance photography, but they have significant shortcomings in macro shooting and zoom operations, failing to fully cover the diverse shooting scenarios users encounter.

[0003] Most smartphones on the market currently use periscope lenses, whose design primarily focuses on infinity-edge shooting, i.e., telephoto capabilities. While this allows them to capture details of distant objects, it falls short in macro photography, i.e., capturing close-up, detailed objects. Furthermore, the limitation of a single focal length means users need to frequently switch devices or use software to simulate zoom effects for different shooting needs. This not only degrades the shooting experience but may also affect image quality. Therefore, there is an urgent need in the market for an imaging system solution that integrates infinity-edge, macro, and zoom functions within a single device to improve user experience and meet professional-grade imaging requirements.

[0004] In other words, existing imaging systems have the problem of not being able to simultaneously meet the needs of infinity-edge and macro shooting as well as zoom functionality. Summary of the Invention

[0005] The main objective of this invention is to provide an imaging system that solves the problem that existing imaging systems cannot simultaneously meet the needs of infinity-edge and macro shooting as well as zoom functionality.

[0006] To achieve the above objectives, according to one aspect of the present invention, an imaging system is provided, comprising a first optical system and a second optical system.

[0007] The first optical system comprises, sequentially from the object side to the image side, a first lens group, a second lens group, and a third lens group along the optical axis of the first optical system. The first lens group includes a first lens with positive optical power, the object side of which is convex, and the image side of which is convex. The second lens group includes a second lens with positive optical power, a third lens with negative optical power, and a fourth lens with positive optical power. The object side of the second lens is convex, the object side of the third lens is convex, and the image side of the third lens is concave. The object side of the fourth lens is convex, and the image side of the fourth lens is convex. The third lens group includes a fifth lens with negative optical power, a sixth lens with either negative or positive optical power, and a seventh lens with negative optical power. The object side of the fifth lens is concave, and the image side of the fifth lens is convex. The object side of the seventh lens is convex, and the image side of the seventh lens is concave. The second lens group of the first optical system is movably arranged on the optical axis to realize the change of the first optical system between a first object distance state and a second object distance state.

[0008] The second optical system comprises, sequentially from the object side to the image side, a first lens group, a second lens group, and a third lens group along the optical axis of the second optical system. The first lens group of the second optical system includes a first lens with positive optical power and a second lens with negative optical power. The object side and image side of the first lens are convex. The second lens group of the second optical system includes a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power. The object side and image side of the third lens are convex, the object side and image side of the fourth lens are convex, and the object side and image side of the fifth lens are both convex. The third lens group of the second optical system includes a sixth lens with negative optical power, a seventh lens with either negative or positive optical power, and an eighth lens with negative optical power. The object side and image side of the sixth lens are both concave, the object side and image side of the eighth lens are both convex, and the object side and image side of the eighth lens are both concave. The combined focal length FAG2 of the second lens group of the first optical system satisfies the following relationship with the change in total focal length Δf of the first optical system when it changes from the first object distance state to the second object distance state: 3.10<FAG2 / Δf<3.70; the combined focal length FBG1 of the first lens group of the second optical system satisfies the following relationship with the combined focal length FAG1 of the first lens group of the first optical system: 8.30≤(FBG1+FAG1) / (FBG1-FAG1)≤9.90.

[0009] According to another aspect of the present invention, an imaging system is provided, comprising a first optical system and a second optical system.

[0010] The first optical system comprises, sequentially from the object side to the image side, a first lens group, a second lens group, and a third lens group along the optical axis of the first optical system. The first lens group includes a first lens with positive optical power, the object side of which is convex, and the image side of which is convex. The second lens group includes a second lens with positive optical power, a third lens with negative optical power, and a fourth lens with positive optical power. The object side of the second lens is convex, the object side of the third lens is convex, and the image side of the third lens is concave. The object side of the fourth lens is convex, and the image side of the fourth lens is convex. The third lens group includes a fifth lens with negative optical power, a sixth lens with either negative or positive optical power, and a seventh lens with negative optical power. The object side of the fifth lens is concave, and the image side of the fifth lens is convex. The object side of the seventh lens is convex, and the image side of the seventh lens is concave. The second lens group of the first optical system is movably arranged on the optical axis to realize the change of the first optical system between a first object distance state and a second object distance state.

[0011] The second optical system comprises, sequentially from the object side to the image side, a first lens group, a second lens group, and a third lens group along the optical axis of the second optical system. The first lens group of the second optical system includes a first lens with positive optical power and a second lens with negative optical power. The object side and image side of the first lens are convex. The second lens group of the second optical system includes a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power. The object side and image side of the third lens are convex, the object side and image side of the fourth lens are convex, and the object side and image side of the fifth lens are both convex. The third lens group of the second optical system includes a sixth lens with negative optical power, a seventh lens with either negative or positive optical power, and an eighth lens with negative optical power. The object side and image side of the sixth lens are both concave, the object side and image side of the eighth lens are both convex, and the image side of the eighth lens is both concave.

[0012] When the first optical system changes from the first object distance state to the second object distance state, the distance ΔT that the second lens group of the first optical system moves along the optical axis, the focal length fA2 of the second lens of the first optical system, and the focal length fA4 of the fourth lens of the first optical system satisfy the following: 1.65mm≤ΔT×(fA2 / fA4)≤4.85mm; the combined focal length FBG1 of the first lens group of the second optical system and the combined focal length FAG1 of the first lens group of the first optical system satisfy the following: 8.30≤(FBG1+FAG1) / (FBG1-FAG1)≤9.90.

[0013] Furthermore, the combined focal length FAG3 of the third lens group of the first optical system, the center thickness CTA5 of the fifth lens of the first optical system on the optical axis, the center thickness CTA6 of the sixth lens of the first optical system on the optical axis, and the center thickness CTA7 of the seventh lens of the first optical system on the optical axis satisfy the following: -6.62≤FAG3 / (CTA5+CTA6+CTA7)≤-5.61.

[0014] Furthermore, when the first optical system changes from the first object distance state to the second object distance state, the distance ΔT that the second lens group of the first optical system moves along the optical axis, the focal length fA2 of the second lens of the first optical system, and the focal length fA4 of the fourth lens of the first optical system satisfy the following: 1.65mm≤ΔT×(fA2 / fA4)≤4.85mm.

[0015] Furthermore, the radius of curvature RB1 of the object side surface of the first lens of the second optical system and the radius of curvature RA1 of the object side surface of the first lens of the first optical system satisfy the following condition: 1.06≤RB1 / RA1≤1.60.

[0016] Furthermore, the curvature radius RA3 of the object side of the second lens of the first optical system, the curvature radius RA8 of the image side of the fourth lens of the first optical system, and the combined focal length FAG2 of the second lens group of the first optical system satisfy the following condition: 1.20 < (RA3 - RA8) / FAG2 < 1.65.

[0017] Furthermore, the combined focal length FBG1 of the first lens group of the second optical system, the combined focal length FBG2 of the second lens group of the second optical system, and the combined focal length FBG3 of the third lens group of the second optical system satisfy the following condition: 29.29≤FBG1 / (FBG2+FBG3)≤47.30.

[0018] Furthermore, the total focal length fB of the second optical system and the change in total focal length Δf of the first optical system when changing from the first object distance state to the second object distance state satisfy the following condition: 5.85 < fB / Δf < 6.40.

[0019] Furthermore, the focal length fA1 of the first lens of the first optical system and the center thickness CTA1 of the first lens of the first optical system on the optical axis satisfy the following condition: 19.93≤fA1 / CTA1≤24.03.

[0020] Furthermore, the combined focal length FBG2 of the second lens group of the second optical system and the distance ΔT that the second lens group of the first optical system moves along the optical axis when the first optical system changes from the first object distance state to the second object distance state satisfy the following condition: 6.95≤FBG2 / ΔT≤7.57.

[0021] Furthermore, the radius of curvature RA8 of the image side of the fourth lens of the first optical system, the radius of curvature RA9 of the object side of the fifth lens of the first optical system, and the distance ΔT that the second lens group of the first optical system moves along the optical axis when the first optical system changes from the first object distance state to the second object distance state satisfy the following: -6.83≤(RA8+RA9) / ΔT≤-6.12.

[0022] Furthermore, the combined focal length FBG1 of the first lens group of the second optical system, the center thickness CTB1 of the first lens of the second optical system on the optical axis, and the center thickness CTB2 of the second lens of the second optical system on the optical axis satisfy the following: 23.32≤FBG1 / (CTB1+CTB2)≤26.03.

[0023] Furthermore, the combined focal length FAG2 of the second lens group of the first optical system, the center thickness CTA2 of the second lens of the first optical system on the optical axis, and the center thickness CTA4 of the fourth lens of the first optical system on the optical axis satisfy the following: 5.55 < FAG2 / (CTA2+CTA4) < 6.20.

[0024] Furthermore, the focal lengths fB6 of the sixth lens of the second optical system, fB8 of the eighth lens of the second optical system, and fB5 of the fifth lens of the second optical system satisfy the following condition: -19.95≤(fB6+fB8) / fB5≤-5.49.

[0025] Furthermore, the imaging system also includes a first prism and a second prism. The first prism is located between the first lens group and the second lens group of the first optical system, or between the first lens group and the second lens group of the second optical system; the second prism is located between the third lens group of the first optical system and the imaging plane.

[0026] Furthermore, the first prism is movably configured, and the switching between the first optical system and the second optical system is achieved by adjusting the position of the first prism; the second lens group of the first optical system is shared with the second lens group of the second optical system, and the third lens group of the first optical system is shared with the third lens group of the second optical system.

[0027] Applying the technical solution of this invention, the imaging system of this application includes a first optical system and a second optical system. By adjusting the position of the second lens group of the first optical system on the optical axis, the first optical system can switch between a first object distance state and a second object distance state. The first object distance state is actually an infinite distance state, and the second object distance state is actually a macro state. This allows the imaging system of this application to meet the shooting needs of infinite distance and macro, while also satisfying the zoom function. Simultaneously, by constraining 3.10 < FAG2 / Δf < 3.70 and 8.30 ≤ (FBG1 + FAG1) / (FBG1 - FAG1) ≤ 9.90, the motor accuracy is kept within 5µm of the center deviation after focusing when the second lens group of the first optical system is focusing, which has a minimal impact on the performance of the imaging system. Furthermore, ensuring that the first lens groups of the two optical systems are laid flat and placed side-by-side facilitates a compact structural configuration and a larger zoom ratio. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0029] Figure 1 This diagram shows a schematic of the first optical system of the imaging system according to Embodiment 1 of the present invention in a first object distance state;

[0030] Figure 2 This diagram shows a schematic of the first optical system of the imaging system according to Embodiment 1 of the present invention in a second object distance state;

[0031] Figure 3 The on-axis chromatic aberration curve of the first optical system of the imaging system according to Embodiment 1 of the present invention is shown;

[0032] Figure 4 The astigmatism curve of the first optical system of the imaging system according to Embodiment 1 of the present invention is shown;

[0033] Figure 5 The distortion curve of the first optical system of the imaging system according to Embodiment 1 of the present invention is shown;

[0034] Figure 6 The magnification chromatic aberration curve of the first optical system of the imaging system according to Embodiment 1 of the present invention is shown;

[0035] Figure 7 A schematic diagram of the structure of the second optical system of the imaging system according to Embodiment 1 of the present invention is shown;

[0036] Figure 8 The on-axis chromatic aberration curve of the second optical system of the imaging system according to Embodiment 1 of the present invention is shown;

[0037] Figure 9 The astigmatism curve of the second optical system of the imaging system according to Embodiment 1 of the present invention is shown;

[0038] Figure 10 The distortion curve of the second optical system of the imaging system according to Embodiment 1 of the present invention is shown;

[0039] Figure 11 The magnification chromatic aberration curve of the second optical system of the imaging system of Embodiment 1 of the present invention is shown;

[0040] Figure 12 This diagram shows a schematic of the first optical system of the imaging system according to Embodiment 2 of the present invention in a first object distance state;

[0041] Figure 13 This diagram shows a schematic of the first optical system of the imaging system in the second object distance state according to Embodiment 2 of the present invention;

[0042] Figure 14 The on-axis chromatic aberration curve of the first optical system of the imaging system according to Embodiment 2 of the present invention is shown;

[0043] Figure 15 The astigmatism curve of the first optical system of the imaging system according to Embodiment 2 of the present invention is shown;

[0044] Figure 16 The distortion curve of the first optical system of the imaging system according to Embodiment 2 of the present invention is shown;

[0045] Figure 17 The magnification chromatic aberration curve of the first optical system of the imaging system according to Embodiment 2 of the present invention is shown;

[0046] Figure 18 A schematic diagram of the structure of the second optical system of the imaging system according to Embodiment 2 of the present invention is shown;

[0047] Figure 19 The on-axis chromatic aberration curve of the second optical system of the imaging system according to Embodiment 2 of the present invention is shown;

[0048] Figure 20 The astigmatism curve of the second optical system of the imaging system according to Embodiment 2 of the present invention is shown;

[0049] Figure 21 The distortion curve of the second optical system of the imaging system according to Embodiment 2 of the present invention is shown;

[0050] Figure 22 The magnification chromatic aberration curve of the second optical system of the imaging system according to Embodiment 2 of the present invention is shown;

[0051] Figure 23 This diagram shows a schematic of the first optical system of the imaging system according to Embodiment 3 of the present invention in a first object distance state;

[0052] Figure 24 This diagram shows a schematic of the first optical system of the imaging system of Embodiment 3 of the present invention in a second object distance state;

[0053] Figure 25 The on-axis chromatic aberration curve of the first optical system of the imaging system of Embodiment 3 of the present invention is shown;

[0054] Figure 26 The astigmatism curve of the first optical system of the imaging system according to Embodiment 3 of the present invention is shown;

[0055] Figure 27 The distortion curve of the first optical system of the imaging system according to Embodiment 3 of the present invention is shown;

[0056] Figure 28 The magnification chromatic aberration curve of the first optical system of the imaging system according to Embodiment 3 of the present invention is shown;

[0057] Figure 29 A schematic diagram of the structure of the second optical system of the imaging system according to Embodiment 3 of the present invention is shown;

[0058] Figure 30 The on-axis chromatic aberration curve of the second optical system of the imaging system of Embodiment 3 of the present invention is shown;

[0059] Figure 31 The astigmatism curve of the second optical system of the imaging system according to Embodiment 3 of the present invention is shown;

[0060] Figure 32 The distortion curve of the second optical system of the imaging system of Embodiment 3 of the present invention is shown;

[0061] Figure 33 The magnification chromatic aberration curve of the second optical system of the imaging system of Embodiment 3 of the present invention is shown;

[0062] Figure 34 This diagram shows a schematic of the first optical system of the imaging system of Embodiment 4 of the present invention in a first object distance state;

[0063] Figure 35 This diagram shows a schematic of the first optical system of the imaging system of Embodiment 4 of the present invention in a second object distance state;

[0064] Figure 36 The on-axis chromatic aberration curve of the first optical system of the imaging system of Embodiment 4 of the present invention is shown;

[0065] Figure 37 The astigmatism curve of the first optical system of the imaging system of Embodiment 4 of the present invention is shown;

[0066] Figure 38 The distortion curve of the first optical system of the imaging system of Embodiment 4 of the present invention is shown;

[0067] Figure 39 The magnification chromatic aberration curve of the first optical system of the imaging system of Embodiment 4 of the present invention is shown;

[0068] Figure 40 A schematic diagram of the structure of the second optical system of the imaging system according to Embodiment 4 of the present invention is shown;

[0069] Figure 41 The on-axis chromatic aberration curve of the second optical system of the imaging system of Embodiment 4 of the present invention is shown;

[0070] Figure 42 The astigmatism curve of the second optical system of the imaging system of Embodiment 4 of the present invention is shown;

[0071] Figure 43 The distortion curve of the second optical system of the imaging system of Embodiment 4 of the present invention is shown;

[0072] Figure 44 The magnification chromatic aberration curve of the second optical system of the imaging system of Embodiment 4 of the present invention is shown;

[0073] Figure 45 A schematic diagram of the first optical system of the imaging system according to Embodiment 5 of the present invention in a first object distance state is shown;

[0074] Figure 46 A schematic diagram of the first optical system of the imaging system of Embodiment 5 of the present invention in a second object distance state is shown;

[0075] Figure 47 The on-axis chromatic aberration curve of the first optical system of the imaging system of Embodiment 5 of the present invention is shown;

[0076] Figure 48 The astigmatism curve of the first optical system of the imaging system according to Embodiment 5 of the present invention is shown;

[0077] Figure 49 The distortion curve of the first optical system of the imaging system according to Embodiment 5 of the present invention is shown;

[0078] Figure 50 The magnification chromatic aberration curve of the first optical system of the imaging system according to Embodiment 5 of the present invention is shown;

[0079] Figure 51 A schematic diagram of the structure of the second optical system of the imaging system according to Embodiment 5 of the present invention is shown;

[0080] Figure 52 The on-axis chromatic aberration curve of the second optical system of the imaging system of Embodiment 5 of the present invention is shown;

[0081] Figure 53 The astigmatism curve of the second optical system of the imaging system of Embodiment 5 of the present invention is shown;

[0082] Figure 54 The distortion curve of the second optical system of the imaging system of Embodiment 5 of the present invention is shown;

[0083] Figure 55 The magnification chromatic aberration curve of the second optical system of the imaging system of Embodiment 5 of the present invention is shown;

[0084] Figure 56 A schematic diagram of an imaging system according to an alternative embodiment of the present invention is shown, in which the first optical system is transformed into a second optical system.

[0085] The above figures include the following reference numerals:

[0086] STO, Aperture Stop; P1, First Prism; G2, Second Lens Group; G3, Third Lens Group; P2, Second Prism; E1, First Lens; S1, Object-Side Surface of First Lens; S2, Image-Side Surface of First Lens; E2, Second Lens; E3, Third Lens; S7, Object-Side Surface of Third Lens; S8, Image-Side Surface of Third Lens; E4, Fourth Lens; S9, Object-Side Surface of Fourth Lens; S10, Image-Side Surface of Fourth Lens; E5, Fifth Lens; S11, Object-Side Surface of Fifth Lens; S12, Image-Side Surface of Fifth Lens; E6, Sixth Lens; S13, Object-Side Surface of Sixth Lens; S14, Image-Side Surface of Sixth Lens; E7, Seventh Lens; S15, Object-Side Surface of Seventh Lens; S16, Image-Side Surface of Seventh Lens. Detailed Implementation

[0087] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0088] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0089] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0090] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0091] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0092] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that convexity 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 location of that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens data in optical software) to determine convexity or concavity. For the object side, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image side, a positive R value indicates a concave surface, and a negative R value indicates a convex surface. When R is infinity, it is considered a plane.

[0093] In this application, the object side refers to the side of the imaging system facing the object being photographed (not shown in the figure), and the image side refers to the side of the imaging system facing the imaging plane. hereinafter, the object side of a lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of a lens refers to the surface of the lens facing the imaging plane.

[0094] To address the problem that existing imaging systems cannot simultaneously meet the needs of infinity-edge and macro photography as well as zoom functionality, this invention provides an imaging system.

[0095] like Figures 1 to 56 As shown, in one optional embodiment of this application, the imaging system includes a first optical system and a second optical system.

[0096] The first optical system comprises, sequentially from the object side to the image side, a first lens group, a second lens group, and a third lens group along the optical axis of the first optical system. The first lens group includes a first lens with positive optical power, the object side of which is convex, and the image side of which is convex. The second lens group includes a second lens with positive optical power, a third lens with negative optical power, and a fourth lens with positive optical power. The object side of the second lens is convex, the object side of the third lens is convex, and the image side of the third lens is concave. The object side of the fourth lens is convex, and the image side of the fourth lens is convex. The third lens group includes a fifth lens with negative optical power, a sixth lens with either negative or positive optical power, and a seventh lens with negative optical power. The object side of the fifth lens is concave, and the image side of the fifth lens is convex. The object side of the seventh lens is convex, and the image side of the seventh lens is concave. The second lens group of the first optical system is movably arranged on the optical axis to realize the change of the first optical system between a first object distance state and a second object distance state.

[0097] The second optical system comprises, sequentially from the object side to the image side, a first lens group, a second lens group, and a third lens group along the optical axis of the second optical system. The first lens group of the second optical system includes a first lens with positive optical power and a second lens with negative optical power. The object side and image side of the first lens are convex. The second lens group of the second optical system includes a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power. The object side and image side of the third lens are convex, the object side and image side of the fourth lens are convex, and the object side and image side of the fifth lens are both convex. The third lens group of the second optical system includes a sixth lens with negative optical power, a seventh lens with either negative or positive optical power, and an eighth lens with negative optical power. The object side and image side of the sixth lens are both concave, the object side and image side of the eighth lens are both convex, and the object side and image side of the eighth lens are both concave.

[0098] The combined focal length FAG2 of the second lens group of the first optical system satisfies the following relationship with the change in total focal length Δf of the first optical system when it changes from the first object distance state to the second object distance state: 3.10<FAG2 / Δf<3.70; the combined focal length FBG1 of the first lens group of the second optical system satisfies the following relationship with the combined focal length FAG1 of the first lens group of the first optical system: 8.30≤(FBG1+FAG1) / (FBG1-FAG1)≤9.90.

[0099] The imaging system of this application includes a first optical system and a second optical system. By adjusting the position of the second lens group of the first optical system on the optical axis, the first optical system can switch between a first object distance state and a second object distance state. The first object distance state is actually an infinity state, and the second object distance state is actually a macro state. This allows the imaging system of this application to meet the shooting needs of infinity and macro, while also satisfying the zoom function. Simultaneously, by constraining 3.10 < FAG2 / Δf < 3.70 and 8.30 ≤ (FBG1 + FAG1) / (FBG1 - FAG1) ≤ 9.90, the motor accuracy is kept within 5µm of the center deviation after focusing when the second lens group of the first optical system is in focus, which has a minimal impact on the performance of the imaging system. Furthermore, ensuring that the first lens groups of the two optical systems are laid flat and placed side-by-side facilitates a compact structural configuration and a larger zoom ratio.

[0100] In this embodiment, the combined focal length FAG3 of the third lens group of the first optical system, the center thickness CTA5 of the fifth lens of the first optical system on the optical axis, the center thickness CTA6 of the sixth lens of the first optical system on the optical axis, and the center thickness CTA7 of the seventh lens of the first optical system satisfy the following condition: -6.62≤FAG3 / (CTA5+CTA6+CTA7)≤-5.61. Reasonably controlling this conditional range can effectively control the aberration compensation effect of the entire imaging system, facilitate lens manufacturing, and simultaneously ensure the overall structural requirements of the system are met.

[0101] In this embodiment, when the first optical system changes from a first object distance state to a second object distance state, the distance ΔT that the second lens group of the first optical system moves along the optical axis, the focal length fA2 of the second lens of the first optical system, and the focal length fA4 of the fourth lens of the first optical system satisfy the following condition: 1.65mm ≤ ΔT × (fA2 / fA4) ≤ 4.85mm. Reasonably controlling this conditional range is beneficial for controlling the focusing movement of the first optical system, ensuring the structural requirements of the entire device, and simultaneously guaranteeing focusing capability and optimizing focusing capability per unit movement range.

[0102] In this embodiment, the radius of curvature RB1 of the object-side surface of the first lens of the second optical system and the radius of curvature RA1 of the object-side surface of the first lens of the first optical system satisfy the condition: 1.06 ≤ RB1 / RA1 ≤ 1.60. Reasonably controlling this conditional range helps ensure that the size of the imaging system is not too large, while also guaranteeing the overall performance and focusing capability of the imaging system.

[0103] In this embodiment, the radius of curvature RA3 of the object side of the second lens of the first optical system, the radius of curvature RA8 of the image side of the fourth lens of the first optical system, and the combined focal length FAG2 of the second lens group of the first optical system satisfy the following condition: 1.20 < (RA3 - RA8) / FAG2 < 1.65. Reasonably controlling this conditional range ensures both the focusing capability of the first optical system and the structural arrangement of the second lens group within the overall camera.

[0104] In this embodiment, the combined focal length FBG1 of the first lens group of the second optical system, the combined focal length FBG2 of the second lens group of the second optical system, and the combined focal length FBG3 of the third lens group of the second optical system satisfy the following condition: 29.29 ≤ FBG1 / (FBG2+FBG3) ≤ 47.30. By reasonably controlling this conditional range, a zoom effect between the two optical systems can be achieved, while increasing the distance between the first lens group and the second lens group, thus ensuring the overall structural layout of the device.

[0105] In this embodiment, the total focal length fB of the second optical system and the change in total focal length Δf of the first optical system when changing from the first object distance state to the second object distance state satisfy the condition: 5.85 < fB / Δf < 6.40. By reasonably controlling the range of this condition, the zoom effect between the two optical systems can be achieved, while ensuring the movement of the second lens group in the whole machine, which meets the requirements of the motor stroke and the overall structural layout of the machine.

[0106] In this embodiment, the focal length fA1 of the first lens of the first optical system and the center thickness CTA1 of the first lens on the optical axis satisfy the following condition: 19.93 ≤ fA1 / CTA1 ≤ 24.03. Reasonably controlling this conditional range can effectively converge the overall light beam height, impose certain constraints on the apertures of the lenses in the second and third lens groups of the first optical system, which helps reduce manufacturing difficulty, while ensuring the overall height of the first lens group of the first optical system meets the overall height requirements of the machine, and simultaneously balancing the manufacturability of the first lens of the first optical system.

[0107] In this embodiment, the combined focal length FBG2 of the second lens group of the second optical system satisfies the following condition when the first optical system changes from the first object distance state to the second object distance state: 6.95 ≤ FBG2 / ΔT ≤ 7.57. Reasonably controlling this conditional range can effectively improve the performance of the second optical system and the overall focal length compensation effect, while ensuring that the movement of the shared second lens group within the entire machine meets the requirements of motor stroke and overall machine structure layout.

[0108] In this embodiment, the radius of curvature RA8 of the image-side surface of the fourth lens of the first optical system, the radius of curvature RA9 of the object-side surface of the fifth lens of the first optical system, and the distance ΔT that the second lens group of the first optical system moves along the optical axis when the first optical system changes from the first object distance state to the second object distance state satisfy the following condition: -6.83≤(RA8+RA9) / ΔT≤-6.12. By reasonably controlling this conditional range, the structural requirements of the second lens group of the first optical system during focusing can be controlled, preventing collisions between the second lens group and the third lens group during focusing.

[0109] In this embodiment, the combined focal length FBG1 of the first lens group of the second optical system, the center thickness CTB1 of the first lens of the second optical system on the optical axis, and the center thickness CTB2 of the second lens of the second optical system on the optical axis satisfy the following condition: 23.32≤FBG1 / (CTB1+CTB2)≤26.03. Reasonably controlling this conditional range can improve the performance of the second optical system, ensuring the manufacturability of the lens on the one hand, and meeting the overall size requirements on the other, preventing the first lens group of the second optical system from protruding from the overall machine.

[0110] In this embodiment, the combined focal length FAG2 of the second lens group of the first optical system, the center thickness CTA2 of the second lens of the first optical system on the optical axis, and the center thickness CTA4 of the fourth lens of the first optical system on the optical axis satisfy the following condition: 5.55 < FAG2 / (CTA2+CTA4) < 6.20. Reasonably controlling this conditional range ensures the focusing capability of the first optical system, while also guaranteeing the structural arrangement of the second lens group of the first optical system in the overall device, and ensuring the manufacturability of the second and fourth lenses of the first optical system.

[0111] In this embodiment, the focal lengths fB6 of the sixth lens, fB8 of the eighth lens, and fB5 of the fifth lens in the second optical system satisfy the following condition: -19.95 ≤ (fB6 + fB8) / fB5 ≤ -5.49. Reasonably controlling this conditional range can effectively reduce the aberrations of the second optical system, thus improving the performance of the imaging system.

[0112] In this embodiment, reference Figure 56 As shown, Figure 56A schematic diagram illustrating an alternative embodiment of the imaging system of the present invention, showing the transformation from a first optical system to a second optical system, is shown. The imaging system further includes a first prism and a second prism. The first prism is located between the first lens group and the second lens group of the first optical system, or between the first lens group and the second lens group of the second optical system. When the first prism is located between the first and second lens groups of the first optical system, it is used to achieve the first fold of the optical path. The first prism has a reflective surface to deflect the light by 90°, ensuring that the first lens group of the first optical system can be assembled face up during assembly, maintaining the overall appearance of the device while reducing its height. That is, the optical axis of the first lens group of the first optical system is perpendicular to the optical axis of the second lens group and intersects at the reflective surface of the first prism. The third lens group of the first optical system is coaxially arranged with the second lens group.

[0113] Specifically, the second prism is located between the third lens group and the imaging plane of the first optical system. The second prism has two reflecting surfaces connected at an acute angle. Light rays emitted from the third lens group enter the second prism through its transmission surface, are reflected by the two reflecting surfaces, and then exit onto the imaging plane. The angle between the principal ray entering the second prism and the principal ray exiting the second prism is 60°. This ensures that the imaging plane is not perpendicular to the optical axes of the first and second lens groups, which helps to reduce the overall size of the device and facilitates its application in small mobile phones.

[0114] In this embodiment, the total focal length of the first optical system in the first object distance state ranges from greater than 23.00 mm to less than 25 mm, and the total focal length of the first optical system in the second object distance state ranges from greater than 18 mm to less than or equal to 20 mm. The total focal length of the second optical system ranges from 30.00 mm to 31.00 mm. There is a focal length difference between the total focal length of the first optical system in the first object distance state or the second object distance state and the total focal length of the second optical system.

[0115] refer to Figure 56As shown, the first lens group of the first optical system and the first lens group of the second optical system are coplanarly arranged. The first prism is movably arranged and can switch between the image-side position of the first lens group of the first optical system and the image-side position of the first lens group of the second optical system. The switching between the first optical system and the second optical system is achieved by adjusting the position of the first prism. Since the total focal lengths of the first optical system and the second optical system are different and there is a certain focal length difference, the zoom function can be realized. When the first prism is located between the first lens group and the second lens group of the first optical system, the first optical system is working, while the second optical system is not working. Then, the movement position of the second lens group of the first optical system on the optical axis is adjusted to realize the change of the first optical system between the first object distance state and the second object distance state. The first object distance state is the infinite distance state, and the second object distance state is the macro state, so as to meet the shooting needs of macro and infinite distance. When the first optical system is in the infinite distance state, its object distance is infinite. When the first prism is located between the first lens group and the second lens group of the second optical system, the second optical system is working while the first optical system is not working. At this time, the object distance of the second optical system is infinite.

[0116] Specifically, the second lens group of the first optical system is shared with the second lens group of the second optical system, and the third lens group of the first optical system is shared with the third lens group of the second optical system. At this time, the first and second optical systems share the second prism. That is to say, the second lens of the first optical system is also the third lens of the second optical system, the third lens of the first optical system is also the fourth lens of the second optical system, the fourth lens of the first optical system is also the fifth lens of the second optical system, the fifth lens of the first optical system is also the sixth lens of the second optical system, the sixth lens of the first optical system is also the seventh lens of the second optical system, and the seventh lens of the first optical system is also the eighth lens of the second optical system.

[0117] It should be noted that the first to seventh lenses in the first optical system are named in order from the object side to the image side, and should not be construed as limiting the lenses of this application. Similarly, the first to eighth lenses in the second optical system are named in order from the object side to the image side, and should not be construed as limiting the lenses of this application.

[0118] In another alternative embodiment of this application, an imaging system is also provided, including a first optical system and a second optical system.

[0119] The first optical system comprises, sequentially from the object side to the image side, a first lens group, a second lens group, and a third lens group along the optical axis of the first optical system. The first lens group includes a first lens with positive optical power, the object side of which is convex, and the image side of which is convex. The second lens group includes a second lens with positive optical power, a third lens with negative optical power, and a fourth lens with positive optical power. The object side of the second lens is convex, the object side of the third lens is convex, and the image side of the third lens is concave. The object side of the fourth lens is convex, and the image side of the fourth lens is convex. The third lens group includes a fifth lens with negative optical power, a sixth lens with either negative or positive optical power, and a seventh lens with negative optical power. The object side of the fifth lens is concave, and the image side of the fifth lens is convex. The object side of the seventh lens is convex, and the image side of the seventh lens is concave. The second lens group of the first optical system is movably arranged on the optical axis to realize the change of the first optical system between a first object distance state and a second object distance state.

[0120] The second optical system, along its optical axis from the object side to the image side, sequentially comprises a first lens group, a second lens group, and a third lens group. The first lens group includes a first lens with positive optical power and a second lens with negative optical power. The object-side and image-side surfaces of the first lens are convex. The second lens group includes a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power. The object-side and image-side surfaces of the third and fourth lenses are convex, respectively, and both are concave. The third lens group includes a sixth lens with negative optical power, a seventh lens with either negative or positive optical power, and an eighth lens with negative optical power. The object-side and image-side surfaces of the sixth lens are concave and convex, respectively, and both are concave.

[0121] When the first optical system changes from the first object distance state to the second object distance state, the distance ΔT that the second lens group of the first optical system moves along the optical axis, the focal length fA2 of the second lens of the first optical system, and the focal length fA4 of the fourth lens of the first optical system satisfy the following: 1.65mm≤ΔT×(fA2 / fA4)≤4.85mm; the combined focal length FBG1 of the first lens group of the second optical system and the combined focal length FAG1 of the first lens group of the first optical system satisfy the following: 8.30≤(FBG1+FAG1) / (FBG1-FAG1)≤9.90.

[0122] The imaging system of this application includes a first optical system and a second optical system. By adjusting the position of the second lens group of the first optical system on the optical axis, the first optical system can switch between a first object distance state and a second object distance state. The first object distance state is actually an infinity state, and the second object distance state is actually a macro state. This allows the imaging system of this application to meet the shooting needs of infinity and macro, while also satisfying the zoom function. Simultaneously, the constraints 1.65mm≤ΔT×(fA2 / fA4)≤4.85mm and 8.30≤(FBG1+FAG1) / (FBG1-FAG1)≤9.90 are beneficial for controlling the focusing movement of the first optical system, ensuring focusing capability, and optimizing focusing capability per unit movement range. Furthermore, when focusing with the second lens group of the first optical system, the motor accuracy is within 5µm of the center deviation after focusing, which has a minimal impact on the performance of the imaging system. Ensuring that the first lens groups of the two optical systems are laid flat and placed side-by-side facilitates a compact structural configuration and a larger zoom ratio.

[0123] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0124] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0125] However, those skilled in the art will understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the imaging system can be changed to obtain the various results and advantages described in this specification.

[0126] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface features and parameters applicable to the imaging systems described above.

[0127] It should be noted that any one of the embodiments 1 to 5 described below is applicable to all implementations of this application. To facilitate understanding of the embodiments of this application, the first optical system and the second optical system will be described separately in the following embodiments.

[0128] It should also be noted that in Embodiments 1 to 5 below, the first to seventh lenses in the first optical system are arranged and named sequentially from the object side to the image side, and the lens labels and lens surface labels are also arranged sequentially from the object side to the image side. This naming and labeling method is only used to describe the composition of the first and second optical systems in each embodiment, and does not constitute a limitation on the number of lenses, their arrangement order, or the specific design of this application. Similarly, the arrangement of the lenses and their surface labels in the second optical system follows the same pattern as in the first optical system, and will not be repeated here.

[0129] Example 1

[0130] like Figures 1 to 11 As shown, the imaging system of Embodiment 1 is described.

[0131] Figures 1 to 6 The first optical system of the imaging system of Embodiment 1 is described. Figure 1 A schematic diagram of the structure of the first optical system in the first object distance state of this embodiment is shown. Figure 2 A schematic diagram of the first optical system in this embodiment in a second object distance state is shown. The first object distance state is an infinite distance state, and the second object distance state is a micro distance state.

[0132] like Figure 1 and Figure 2 As shown, the first optical system of this embodiment includes, in sequence from the object side to the image side along the optical axis of the first optical system, a first lens group G1-A, a first prism P1, a second lens group G2, a third lens group G3, a second prism P2, a protective glass E8, and an imaging surface S21.

[0133] The first lens group G1-A of the first optical system includes a first lens E1 with positive optical power, whose object-side surface S1 is convex and image-side surface S2 is convex. The second lens group G2 includes a second lens E2 with positive optical power, a third lens E3 with negative optical power, and a fourth lens E4 with positive optical power. The object-side surface S5 and image-side surface S6 of the second lens are convex. The object-side surface S7 of the third lens is convex, and the image-side surface S8 is concave. The object-side surface S9 and image-side surface S10 of the fourth lens are convex. The third lens group G3 includes a fifth lens E5, a sixth lens E6, and a seventh lens E7 with negative optical power. The object-side surface S11 of the fifth lens is concave, and the image-side surface S12 is convex. The object-side surface S13 of the sixth lens is convex, and the image-side surface S14 is concave. The object-side surface S15 of the seventh lens is convex, and the image-side surface S16 of the seventh lens is concave.

[0134] In this embodiment, the first optical system further includes an aperture stop STO, which is located on the object side of the first lens E1. The first prism P1 has an object-side surface S3 and an image-side surface S4. The second prism P2 has an object-side surface S17 and an image-side surface S18. The protective glass E8 has an object-side surface S19 and an image-side surface S20.

[0135] Table 1 shows the basic structural parameters of the first optical system in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) represents the object distance.

[0136] Table 1

[0137]

[0138]

[0139] Table 2 shows the values ​​of D1, D2, and D3 of the first optical system in the first object distance state and the second object distance state, respectively. Wherein, D1 is the object distance, D2 is the distance on the optical axis from the image side surface S4 of the first prism to the object side surface S5 of the second lens, and D3 is the distance on the optical axis from the image side surface S10 of the fourth lens to the object side surface S11 of the fifth lens.

[0140] Table 2

[0141] D1(mm) D2 (mm) D3(mm) First object distance state endless 4.1700 1.1532 Second object distance state 114.2987 1.8203 3.5032

[0142] In the first optical system of Embodiment 1, the object-side and image-side surfaces of the first lens E1 to the seventh lens E7 are all aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0143]

[0144] Where x is the distance vector from the vertex 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 reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 of each aspherical mirror S1-S16 that can be used in the first optical system of Embodiment 1.

[0145] Table 3

[0146]

[0147]

[0148] Figure 3 The on-axis chromatic aberration curve of the first optical system of the imaging system of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system. Figure 4 The astigmatism curve of the first optical system of the imaging system of Embodiment 1 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The distortion curve of the first optical system of the imaging system of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 6 The magnification chromatic aberration curve of the first optical system of the imaging system of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the first optical system.

[0149] according to Figures 3 to 6 As can be seen, the first optical system given in Example 1 can achieve good imaging quality.

[0150] Figures 7 to 11 A second optical system of the imaging system of Embodiment 1 is described. Figure 7 A schematic diagram of the structure of the second optical system in this embodiment is shown.

[0151] like Figure 7 As shown, the second optical system of this embodiment includes, in sequence from the object side to the image side along the optical axis of the second optical system, a first lens group G1-B, a first prism P1, a second lens group G2, a third lens group G3, a second prism P2, a protective glass E9, and an imaging surface S23.

[0152] The second optical system comprises a first lens group G1-B, which includes a first lens E1 with positive optical power and a second lens E2 with negative optical power. The object-side surface S1 and image-side surface S2 of the first lens are convex. The object-side surface S3 and image-side surface S4 of the second lens are concave. The second lens group G2 includes a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, and a fifth lens E5 with positive optical power. The object-side surface S7 and image-side surface S8 of the third lens are convex. The object-side surface S9 and image-side surface S10 of the fourth lens are concave. The object-side surface S11 and image-side surface S12 of the fifth lens are convex. The third lens group G3 includes a sixth lens E6, a seventh lens E7 with negative optical power, and an eighth lens E8 with negative optical power. The object-side surface S13 of the sixth lens is concave, and the image-side surface S14 of the sixth lens is convex. The object-side surface S15 of the seventh lens is convex, and the image-side surface S16 of the seventh lens is concave. The object-side surface S17 of the eighth lens is convex, and the image-side surface S18 of the eighth lens is concave.

[0153] In this embodiment, the second optical system further includes an aperture stop STO, which is located on the object side of the first lens E1. The first prism P1 has an object-side surface S5 and an image-side surface S6. The second prism P2 has an object-side surface S19 and an image-side surface S20. The protective glass E8 has an object-side surface S21 and an image-side surface S22.

[0154] Table 4 shows the basic structural parameters of the second optical system in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) represents the object distance.

[0155] Table 4

[0156] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless -0.0574 S1 aspherical 31.8172 1.1197 1.55 56.11 0.0000 S2 aspherical -51.5125 0.1018 0.0000 S3 spherical -45.8109 0.7121 1.96 17.94 S4 spherical -59.8745 1.2600 S5 spherical endless 8.2000 1.84 42.73 S6 spherical endless 13.8296 S7 aspherical 13.1180 0.9852 1.59 28.43 2.5724 S8 aspherical -10.0805 0.0500 1.2236 S9 aspherical 33.9150 1.0300 1.62 25.91 -98.9124 S10 aspherical 3.6355 0.9672 -1.0294 S11 aspherical 12.9890 1.9444 1.55 56.11 -2.1003 S12 aspherical -10.0905 0.8529 0.6822 S13 aspherical -4.6740 1.0404 1.55 56.11 -0.7329 S14 aspherical -5.2880 0.4385 0.0273 S15 aspherical 12.5285 0.6335 1.65 23.53 -10.2635 S16 aspherical 9.1866 0.3609 -7.0960 S17 aspherical 5.9238 0.7866 1.55 56.11 -0.0040 S18 aspherical 4.1548 0.9504 -0.2858 S19 spherical endless 11.0000 1.92 35.28 S20 spherical endless 0.5976 S21 spherical endless 0.3100 1.54 65.52 S22 spherical endless 0.6924 S23 spherical endless

[0157] Table 5 below shows the higher-order coefficients A4-A30 of each aspherical lens S1-S18 in the second optical system that can be used in Embodiment 1. The surface shape of each aspherical lens is defined according to the above formula (1). In the second optical system, the object-side and image-side surfaces of the first lens E1, the third lens E3-the eighth lens E8 are aspherical, while the object-side and image-side surfaces of the second lens E2 are spherical.

[0158] Table 5

[0159]

[0160]

[0161] Figure 8 The on-axis chromatic aberration curve of the second optical system of the imaging system of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 9 The astigmatism curves of the second optical system of the imaging system of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 10 The distortion curve of the second optical system of the imaging system of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 11 The magnification chromatic aberration curve of the second optical system of the imaging system of Embodiment 1 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the second optical system.

[0162] according to Figures 8 to 11 As can be seen, the second optical system given in Example 1 can achieve good imaging quality.

[0163] Example 2

[0164] like Figures 12 to 22 As shown, the imaging system of Embodiment 2 is described.

[0165] Figures 12 to 17 The first optical system of the imaging system of Embodiment 2 is described. Figure 12 A schematic diagram of the structure of the first optical system in the first object distance state of this embodiment is shown. Figure 13 A schematic diagram of the first optical system in this embodiment in a second object distance state is shown. The first object distance state is an infinite distance state, and the second object distance state is a micro distance state.

[0166] like Figure 12 and Figure 13 As shown, the first optical system of this embodiment includes, in sequence from the object side to the image side along the optical axis of the first optical system, a first lens group G1-A, a first prism P1, a second lens group G2, a third lens group G3, a second prism P2, a protective glass E8, and an imaging surface S21.

[0167] The first lens group G1-A of the first optical system includes a first lens E1 with positive optical power, whose object-side surface S1 is convex and image-side surface S2 is convex. The second lens group G2 includes a second lens E2 with positive optical power, a third lens E3 with negative optical power, and a fourth lens E4 with positive optical power. The object-side surface S5 of the second lens is convex, and the image-side surface S6 is concave. The object-side surface S7 of the third lens is convex, and the image-side surface S8 is concave. The object-side surface S9 of the fourth lens is convex, and the image-side surface S10 is convex. The third lens group G3 includes a fifth lens E5, a sixth lens E6, and a seventh lens E7 with negative optical power. The object-side surface S11 of the fifth lens is concave, and the image-side surface S12 is convex. The object-side surface S13 of the sixth lens is concave, and the image-side surface S14 is convex. The object-side surface S15 of the seventh lens is convex, and the image-side surface S16 of the seventh lens is concave.

[0168] In this embodiment, the first optical system further includes an aperture stop STO, which is located on the object side of the first lens E1. The first prism P1 has an object-side surface S3 and an image-side surface S4. The second prism P2 has an object-side surface S17 and an image-side surface S18. The protective glass E8 has an object-side surface S19 and an image-side surface S20.

[0169] Table 6 shows the basic structural parameters of the first optical system in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) represents the object distance.

[0170] Table 6

[0171] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number Conic coefficient OBJ spherical endless D1 STO spherical endless -0.5489 S1 aspherical 25.7710 1.6006 1.50 81.56 0.0000 S2 aspherical -62.0196 1.2100 0.0000 S3 spherical endless 8.2000 1.92 35.28 S4 spherical endless D2 S5 aspherical 14.0910 0.8333 1.59 28.43 0.0000 S6 aspherical 1465.7628 0.0400 0.0000 S7 aspherical 5.0118 1.0017 1.68 19.24 0.0000 S8 aspherical 3.0942 1.1261 -1.0000 S9 aspherical 12.2038 1.8055 1.55 56.11 0.0000 S10 aspherical -12.1449 D3 0.0000 S11 aspherical -3.6479 0.6656 1.55 56.11 -1.0000 S12 aspherical -5.3708 0.2716 0.0000 S13 aspherical -34.2512 0.6300 1.68 19.24 0.0000 S14 aspherical -46.0636 0.8501 0.0000 S15 aspherical 10.4153 1.4321 1.55 56.11 0.0000 S16 aspherical 7.8406 0.7012 0.0000 S17 spherical endless 11.0000 1.92 35.28 S18 spherical endless 0.5146 S19 spherical endless 0.4000 1.52 64.17 S20 spherical endless 0.5912 S21 spherical endless

[0172] Table 7 shows the values ​​of D1, D2, and D3 of the first optical system in the first object distance state and the second object distance state, respectively. Wherein, D1 is the object distance, D2 is the distance on the optical axis from the image side surface S4 of the first prism to the object side surface S5 of the second lens, and D3 is the distance on the optical axis from the image side surface S10 of the fourth lens to the object side surface S11 of the fifth lens.

[0173] Table 7

[0174] D1(mm) D2 (mm) D3 (mm) First object distance state endless 4.0913 1.0568 Second object distance state 96.1385 1.7800 3.3683

[0175] In the first optical system of Embodiment 2, the object-side and image-side surfaces of the first lens E1 to the seventh lens E7 are all aspherical. Table 8 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each aspherical mirror S1-S16 that can be used in the first optical system of Embodiment 2.

[0176] Table 8

[0177] Face number A4 A6 A8 A10 A12 A14 A16 S1 -5.1359E-05 -3.7487E-06 -1.2287E-06 6.5486E-07 -1.3652E-07 1.6794E-08 -1.3603E-09 S2 -5.6050E-06 -3.1287E-05 9.1562E-06 -1.6735E-06 2.0413E-07 -1.7366E-08 1.0574E-09 S5 2.3664E-03 -3.6376E-04 1.7747E-04 -6.6411E-05 1.7531E-05 -3.1645E-06 3.8966E-07 S6 5.1575E-03 6.6558E-04 -4.9802E-04 1.5103E-04 -2.4620E-05 2.0630E-06 -4.4116E-08 S7 -5.4158E-03 1.8855E-03 -7.9457E-04 2.1996E-04 -3.7579E-05 3.6722E-06 -1.3398E-07 S8 -9.2144E-03 1.8878E-03 -4.2111E-04 3.4814E-05 1.9975E-05 -9.6353E-06 2.2004E-06 S9 -1.0546E-04 4.4681E-04 -2.7560E-04 1.2695E-04 -4.2606E-05 1.0351E-05 -1.8202E-06 S10 -1.9196E-04 2.5481E-04 -1.1876E-04 3.4110E-05 -5.9612E-06 6.3835E-07 -4.0479E-08 S11 2.2814E-02 -1.2924E-03 -1.3743E-03 9.6078E-04 -3.7787E-04 1.0217E-04 -1.9885E-05 S12 2.7052E-02 -4.9075E-03 1.1244E-03 -1.8803E-04 1.6697E-05 -9.5529E-08 -1.3245E-07 S13 1.2997E-02 -7.6363E-03 4.1604E-03 -1.5911E-03 4.6401E-04 -1.0523E-04 1.8332E-05 S14 1.0979E-02 -5.6653E-03 3.0453E-03 -1.1132E-03 3.0053E-04 -6.0829E-05 9.1358E-06 S15 8.1316E-04 -2.4311E-03 1.0298E-03 -2.9921E-04 6.3598E-05 -9.9838E-06 1.1573E-06 S16 -4.2539E-03 -6.2711E-04 3.2752E-04 -9.3158E-05 1.8407E-05 -2.6179E-06 2.6975E-07 Face number A18 A20 A22 A24 A26 A28 A30 S1 7.5915E-11 -2.9715E-12 8.1490E-14 -1.5340E-15 1.8884E-17 -1.3689E-19 4.4303E-22 S2 -4.6766E-11 1.5087E-12 -3.5247E-14 5.8286E-16 -6.4952E-18 4.3920E-20 -1.3659E-22 S5 -3.3161E-08 1.9672E-09 -8.1206E-11 2.2972E-12 -4.2908E-14 4.8537E-16 -2.5800E-18 S6 -7.5310E-09 7.3626E-10 -2.4417E-11 -1.2841E-13 3.3398E-14 -9.3152E-16 8.7772E-18 S7 -1.3394E-08 2.3409E-09 -1.7349E-10 7.7931E-12 -2.1992E-13 3.6188E-15 -2.6610E-17 S8 -3.1875E-07 3.1595E-08 -2.1876E-09 1.0451E-10 -3.2862E-12 6.1116E-14 -5.0761E-16 S9 2.3044E-07 -2.0820E-08 1.3243E-09 -5.7865E-11 1.6570E-12 -2.8140E-14 2.1642E-16 S10 1.3753E-09 -1.7796E-11 -6.6992E-14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 2.8268E-06 -2.9351E-07 2.1986E-08 -1.1553E-09 4.0364E-11 -8.4128E-13 7.9099E-15 S12 1.2943E-08 -5.1835E-10 6.9567E-12 4.1803E-14 0.0000E+00 0.0000E+00 0.0000E+00 S13 -2.4154E-06 2.3720E-07 -1.7036E-08 8.6714E-10 -2.9574E-11 6.0488E-13 -5.5964E-15 S14 -1.0060E-06 8.0217E-08 -4.5508E-09 1.7828E-10 -4.5691E-12 6.8792E-14 -4.6092E-16 S15 -9.8692E-08 6.1397E-09 -2.7420E-10 8.5364E-12 -1.7549E-13 2.1374E-15 -1.1663E-17 S16 -2.0098E-08 1.0721E-09 -4.0090E-11 1.0096E-12 -1.5900E-14 1.3454E-16 -4.0902E-19

[0178] Figure 14 The on-axis chromatic aberration curve of the first optical system of the imaging system of Embodiment 2 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system. Figure 15 The astigmatism curve of the first optical system of the imaging system of Embodiment 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 16 The distortion curve of the first optical system of the imaging system of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 17 The magnification chromatic aberration curve of the first optical system of the imaging system of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the first optical system.

[0179] according to Figures 14 to 17 It can be seen that the first optical system given in Embodiment 2 can achieve good imaging quality.

[0180] Figures 18 to 22 The second optical system of the imaging system of Embodiment 2 is described. Figure 18 A schematic diagram of the structure of the second optical system in this embodiment is shown.

[0181] like Figure 18 As shown, the second optical system of this embodiment includes, in sequence from the object side to the image side along the optical axis of the second optical system, a first lens group G1-B, a first prism P1, a second lens group G2, a third lens group G3, a second prism P2, a protective glass E9, and an imaging surface S23.

[0182] The second optical system comprises a first lens group G1-B, which includes a first lens E1 with positive optical power and a second lens E2 with negative optical power. The object-side surface S1 and image-side surface S2 of the first lens are convex. The object-side surface S3 and image-side surface S4 of the second lens are concave. The second lens group G2 includes a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, and a fifth lens E5 with positive optical power. The object-side surface S7 and image-side surface S8 of the third lens are convex. The object-side surface S9 and image-side surface S10 of the fourth lens are convex. The object-side surface S11 and image-side surface S12 of the fifth lens are convex. The third lens group G3 includes a sixth lens E6, a seventh lens E7 with negative optical power, and an eighth lens E8 with negative optical power. The object-side surface S13 of the sixth lens is concave, and the image-side surface S14 of the sixth lens is convex. The object-side surface S15 of the seventh lens is concave, and the image-side surface S16 of the seventh lens is convex. The object-side surface S17 of the eighth lens is convex, and the image-side surface S18 of the eighth lens is concave.

[0183] In this embodiment, the second optical system further includes an aperture stop STO, which is located on the object side of the first lens E1. The first prism P1 has an object-side surface S5 and an image-side surface S6. The second prism P2 has an object-side surface S19 and an image-side surface S20. The protective glass E8 has an object-side surface S21 and an image-side surface S22.

[0184] Table 9 shows the basic structural parameters of the second optical system in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) represents the object distance.

[0185] Table 9

[0186]

[0187]

[0188] Table 10 below shows the higher-order coefficients A4-A30 of each aspherical lens S1-S18 in the second optical system that can be used in Embodiment 2. The surface shape of each aspherical lens is defined according to the above formula (1). In the second optical system, the object-side and image-side surfaces of the first lens E1 to the eighth lens E8 are both aspherical.

[0189] Table 10

[0190]

[0191]

[0192] Figure 19 The on-axis chromatic aberration curve of the second optical system of the imaging system of Embodiment 2 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 20 The astigmatism curves of the second optical system of the imaging system of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 21 The distortion curve of the second optical system of the imaging system of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 22 The magnification chromatic aberration curve of the second optical system of the imaging system of Embodiment 2 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the second optical system.

[0193] according to Figures 19 to 22 It can be seen that the second optical system given in Embodiment 2 can achieve good imaging quality.

[0194] Example 3

[0195] like Figures 23 to 33 As shown, the imaging system of Embodiment 3 is described.

[0196] Figures 23 to 28 The first optical system of the imaging system of Embodiment 3 is described. Figure 23 A schematic diagram of the structure of the first optical system in the first object distance state of this embodiment is shown. Figure 24 A schematic diagram of the first optical system in this embodiment in a second object distance state is shown. The first object distance state is an infinite distance state, and the second object distance state is a micro distance state.

[0197] like Figure 23 and Figure 24 As shown, the first optical system of this embodiment includes, in sequence from the object side to the image side along the optical axis of the first optical system, a first lens group G1-A, a first prism P1, a second lens group G2, a third lens group G3, a second prism P2, a protective glass E8, and an imaging surface S21.

[0198] The first lens group G1-A of the first optical system includes a first lens E1 with positive optical power, whose object-side surface S1 is convex and image-side surface S2 is convex. The second lens group G2 includes a second lens E2 with positive optical power, a third lens E3 with negative optical power, and a fourth lens E4 with positive optical power. The object-side surface S5 and image-side surface S6 of the second lens are convex. The object-side surface S7 of the third lens is convex, and the image-side surface S8 is concave. The object-side surface S9 and image-side surface S10 of the fourth lens are convex. The third lens group G3 includes a fifth lens E5, a sixth lens E6, and a seventh lens E7 with negative optical power. The object-side surface S11 of the fifth lens is concave, and the image-side surface S12 is convex. The object-side surface S13 of the sixth lens is concave, and the image-side surface S14 is convex. The object-side surface S15 of the seventh lens is convex, and the image-side surface S16 of the seventh lens is concave.

[0199] In this embodiment, the first optical system further includes an aperture stop STO, which is located on the object side of the first lens E1. The first prism P1 has an object-side surface S3 and an image-side surface S4. The second prism P2 has an object-side surface S17 and an image-side surface S18. The protective glass E8 has an object-side surface S19 and an image-side surface S20.

[0200] Table 11 shows the basic structural parameters of the first optical system in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) represents the object distance.

[0201] Table 11

[0202] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless D1 STO spherical endless -0.3928 S1 aspherical 25.8221 1.6166 1.50 81.56 0.0000 S2 aspherical -61.8766 1.2131 0.0000 S3 spherical endless 8.2000 1.92 35.28 S4 spherical endless D2 S5 aspherical 10.1458 1.3117 1.59 28.43 0.0000 S6 aspherical -10.4069 0.0869 0.0000 S7 aspherical 12.0243 0.8277 1.65 23.53 0.0000 S8 aspherical 3.0396 0.9644 -1.0000 S9 aspherical 13.0681 1.6758 1.55 56.11 0.0000 S10 aspherical -11.0211 D3 0.0000 S11 aspherical -3.9600 0.6300 1.55 56.11 0.0000 S12 aspherical -5.4496 0.8192 0.0000 S13 aspherical -6.4621 0.6300 1.65 23.53 0.0000 S14 aspherical -7.0005 0.1070 0.0000 S15 aspherical 8.0910 1.3325 1.55 56.11 0.0000 S16 aspherical 5.6748 0.7251 0.0000 S17 spherical endless 11.0000 1.92 35.28 S18 spherical endless 0.5413 S19 spherical endless 0.4000 1.52 64.17 S20 spherical endless 0.6165 S21 spherical endless

[0203] Table 12 shows the values ​​of D1, D2, and D3 of the first optical system in the first object distance state and the second object distance state, respectively. Wherein, D1 is the object distance, D2 is the distance on the optical axis from the image side surface S4 of the first prism to the object side surface S5 of the second lens, and D3 is the distance on the optical axis from the image side surface S10 of the fourth lens to the object side surface S11 of the fifth lens.

[0204] Table 12

[0205] D1(mm) D2 (mm) D3 (mm) First object distance state endless 4.1800 1.0477 Second object distance state 96.1809 1.7800 3.4478

[0206] In the first optical system of Embodiment 3, the object-side and image-side surfaces of the first lens E1 to the seventh lens E7 are all aspherical. Table 13 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each aspherical mirror S1-S16 that can be used in the first optical system of Embodiment 3.

[0207] Table 13

[0208] Face number A4 A6 A8 A10 A12 A14 A16 S1 -4.4125E-05 -7.5147E-06 -6.1359E-07 5.5366E-07 -1.2710E-07 1.6655E-08 -1.4300E-09 S2 5.4054E-06 -3.6723E-05 1.0134E-05 -1.8528E-06 2.2884E-07 -1.9666E-08 1.1949E-09 S5 -2.2982E-04 -5.6590E-05 6.8552E-05 -2.3835E-05 5.1164E-06 -7.0725E-07 6.0940E-08 S6 6.9865E-03 1.6078E-03 -1.1030E-03 3.3886E-04 -6.7341E-05 9.4526E-06 -9.8528E-07 S7 -9.0516E-03 5.8737E-03 -2.2431E-03 5.6521E-04 -9.7132E-05 1.1247E-05 -8.1937E-07 S8 -1.9365E-02 6.1640E-03 -1.7753E-03 3.7390E-04 -5.1715E-05 3.2034E-06 3.3976E-07 S9 -6.0442E-04 4.8428E-04 -2.3671E-04 1.1136E-04 -4.1530E-05 1.1106E-05 -2.1242E-06 S10 -1.8025E-05 6.1009E-05 -2.5472E-05 7.5823E-06 -1.4847E-06 1.7720E-07 -1.2285E-08 S11 3.2952E-02 -5.9627E-03 1.1154E-03 -1.2859E-04 -1.6959E-05 1.4162E-05 -4.1042E-06 S12 3.6982E-02 -7.0835E-03 1.4045E-03 -2.4194E-04 3.4854E-05 -4.0292E-06 3.4439E-07 S13 2.6054E-02 -9.2649E-03 3.2160E-03 -9.5572E-04 2.6008E-04 -6.1721E-05 1.1755E-05 S14 2.1771E-02 -8.2071E-03 2.7376E-03 -6.3080E-04 1.1213E-04 -1.6620E-05 2.1105E-06 S15 -9.1927E-04 -3.3219E-03 1.4988E-03 -3.9207E-04 7.0478E-05 -9.1494E-06 8.6975E-07 S16 -1.0957E-02 1.6274E-03 -4.6573E-04 1.2425E-04 -2.5421E-05 3.8165E-06 -4.1958E-07 Face number A18 A20 A22 A24 A26 A28 A30 S1 8.4595E-11 -3.5148E-12 1.0252E-13 -2.0574E-15 2.7070E-17 -2.1030E-19 7.3130E-22 S2 -5.1645E-11 1.5784E-12 -3.3370E-14 4.6561E-16 -3.8902E-18 1.5334E-20 -7.9195E-24 S5 -2.9508E-09 4.6017E-11 2.2260E-12 -6.6879E-14 -3.7872E-15 2.1282E-16 -2.9725E-18 S6 7.9044E-08 -4.9932E-09 2.4796E-10 -9.3267E-12 2.4612E-13 -3.9901E-15 2.9515E-17 S7 2.6987E-08 1.1671E-09 -1.9365E-10 1.1176E-11 -3.5923E-13 6.3856E-15 -4.9308E-17 S8 -1.0955E-07 1.3783E-08 -1.0615E-09 5.3281E-11 -1.7035E-12 3.1468E-14 -2.5433E-16 S9 2.9259E-07 -2.9052E-08 2.0622E-09 -1.0232E-10 3.3835E-12 -6.7268E-14 6.1032E-16 S10 4.4452E-10 -5.6458E-12 -3.6147E-14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 7.4339E-07 -9.1889E-08 7.8859E-09 -4.6335E-10 1.7805E-11 -4.0347E-13 4.0908E-15 S12 -1.9324E-08 5.9446E-10 -5.7274E-12 -8.2486E-14 0.0000E+00 0.0000E+00 0.0000E+00 S13 -1.7096E-06 1.8484E-07 -1.4517E-08 8.0166E-10 -2.9442E-11 6.4466E-13 -6.3589E-15 S14 -2.2724E-07 1.9983E-08 -1.3588E-09 6.6983E-11 -2.2134E-12 4.3374E-14 -3.7857E-16 S15 -6.0398E-08 3.0242E-09 -1.0645E-10 2.5162E-12 -3.6653E-14 2.7326E-16 -5.7639E-19 S16 3.3802E-08 -1.9852E-09 8.3757E-11 -2.4658E-12 4.7980E-14 -5.5367E-16 2.8662E-18

[0209] Figure 25 The on-axis chromatic aberration curve of the first optical system of the imaging system of Embodiment 3 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system. Figure 26 The astigmatism curve of the first optical system of the imaging system of Embodiment 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 27 The distortion curve of the first optical system of the imaging system of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 28 The magnification chromatic aberration curve of the first optical system of the imaging system of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the first optical system.

[0210] according to Figures 25 to 28 It can be seen that the first optical system given in Embodiment 3 can achieve good imaging quality.

[0211] Figures 29 to 33 The second optical system of the imaging system of Embodiment 3 is described. Figure 29 A schematic diagram of the structure of the second optical system in this embodiment is shown.

[0212] like Figure 29 As shown, the second optical system of this embodiment includes, in sequence from the object side to the image side along the optical axis of the second optical system, a first lens group G1-B, a first prism P1, a second lens group G2, a third lens group G3, a second prism P2, a protective glass E9, and an imaging surface S23.

[0213] The second optical system comprises a first lens group G1-B, which includes a first lens E1 with positive optical power and a second lens E2 with negative optical power. The object-side surface S1 and image-side surface S2 of the first lens are convex. The object-side surface S3 and image-side surface S4 of the second lens are concave. The second lens group G2 includes a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, and a fifth lens E5 with positive optical power. The object-side surface S7 and image-side surface S8 of the third lens are convex. The object-side surface S9 and image-side surface S10 of the fourth lens are concave. The object-side surface S11 and image-side surface S12 of the fifth lens are convex. The third lens group G3 includes a sixth lens E6, a seventh lens E7 with negative optical power, and an eighth lens E8 with negative optical power. The object-side surface S13 of the sixth lens is concave, and the image-side surface S14 of the sixth lens is convex. The object-side surface S15 of the seventh lens is concave, and the image-side surface S16 of the seventh lens is convex. The object-side surface S17 of the eighth lens is convex, and the image-side surface S18 of the eighth lens is concave.

[0214] In this embodiment, the second optical system further includes an aperture stop STO, which is located on the object side of the first lens E1. The first prism P1 has an object-side surface S5 and an image-side surface S6. The second prism P2 has an object-side surface S19 and an image-side surface S20. The protective glass E8 has an object-side surface S21 and an image-side surface S22.

[0215] Table 14 shows the basic structural parameters of the second optical system in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) represents the object distance.

[0216] Table 14

[0217]

[0218]

[0219] Table 15 below shows the higher-order coefficients A4-A30 of each aspherical lens S1-S18 in the second optical system that can be used in Embodiment 3. The surface shape of each aspherical lens is defined according to the above formula (1). In the second optical system, the object-side and image-side surfaces of the first lens E1 to the eighth lens E8 are both aspherical.

[0220] Table 15

[0221] Face number A4 A6 A8 A10 A12 A14 A16 S1 6.9953E-04 -4.5769E-04 3.4493E-04 -1.4189E-04 3.5243E-05 -5.7287E-06 6.4041E-07 S2 -1.9132E-03 1.2093E-03 1.2919E-04 -2.6308E-04 9.3544E-05 -1.7984E-05 2.2143E-06 S3 -4.9115E-03 2.7845E-03 -6.4392E-04 -2.3116E-05 4.4598E-05 -1.1128E-05 1.5350E-06 S4 -2.9101E-03 1.5572E-03 -5.5505E-04 1.1128E-04 -1.2278E-05 5.0927E-07 5.0729E-08 S7 -2.2983E-04 -5.6562E-05 6.8521E-05 -2.3816E-05 5.1087E-06 -7.0525E-07 6.0578E-08 S8 6.9865E-03 1.6078E-03 -1.1030E-03 3.3886E-04 -6.7341E-05 9.4525E-06 -9.8526E-07 S9 -9.0516E-03 5.8736E-03 -2.2429E-03 5.6513E-04 -9.7098E-05 1.1237E-05 -8.1750E-07 S10 -1.9365E-02 6.1642E-03 -1.7756E-03 3.7410E-04 -5.1821E-05 3.2407E-06 3.3068E-07 S11 -6.0441E-04 4.8425E-04 -2.3666E-04 1.1132E-04 -4.1509E-05 1.1098E-05 -2.1224E-06 S12 -1.8026E-05 6.1010E-05 -2.5473E-05 7.5825E-06 -1.4848E-06 1.7721E-07 -1.2286E-08 S13 3.2952E-02 -5.9627E-03 1.1154E-03 -1.2860E-04 -1.6958E-05 1.4161E-05 -4.1041E-06 S14 3.6982E-02 -7.0835E-03 1.4045E-03 -2.4192E-04 3.4848E-05 -4.0278E-06 3.4418E-07 S15 2.6054E-02 -9.2649E-03 3.2160E-03 -9.5573E-04 2.6008E-04 -6.1721E-05 1.1755E-05 S16 2.1771E-02 -8.2071E-03 2.7375E-03 -6.3074E-04 1.1210E-04 -1.6610E-05 2.1085E-06 S17 -9.1927E-04 -3.3219E-03 1.4988E-03 -3.9208E-04 7.0479E-05 -9.1498E-06 8.6982E-07 S18 -1.0957E-02 1.6274E-03 -4.6573E-04 1.2425E-04 -2.5421E-05 3.8165E-06 -4.1959E-07 Face number A18 A20 A22 A24 A26 A28 A30 S1 -5.0607E-08 2.8572E-09 -1.1471E-10 3.2011E-12 -5.9048E-14 6.4745E-16 -3.1955E-18 S2 -1.8612E-07 1.0956E-08 -4.5280E-10 1.2892E-11 -2.4101E-13 2.6640E-15 -1.3194E-17 S3 -1.3773E-07 8.4697E-09 -3.6151E-10 1.0560E-11 -2.0174E-13 2.2729E-15 -1.1455E-17 S4 -9.8609E-09 7.9431E-10 -3.8991E-11 1.2400E-12 -2.5075E-14 2.9434E-16 -1.5309E-18 S7 -2.9042E-09 4.1746E-11 2.5037E-12 -7.9382E-14 -3.4167E-15 2.0631E-16 -2.9214E-18 S8 7.9042E-08 -4.9930E-09 2.4794E-10 -9.3260E-12 2.4610E-13 -3.9898E-15 2.9512E-17 S9 2.6728E-08 1.1925E-09 -1.9542E-10 1.1261E-11 -3.6195E-13 6.4367E-15 -4.9739E-17 S10 -1.0799E-07 1.3590E-08 -1.0448E-09 5.2275E-11 -1.6637E-12 3.0534E-14 -2.4451E-16 S11 2.9227E-07 -2.9012E-08 2.0588E-09 -1.0212E-10 3.3753E-12 -6.7076E-14 6.0831E-16 S12 4.4456E-10 -5.6472E-12 -3.6128E-14 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 7.4337E-07 -9.1887E-08 7.8858E-09 -4.6334E-10 1.7804E-11 -4.0346E-13 4.0907E-15 S14 -1.9304E-08 5.9323E-10 -5.6844E-12 -8.3133E-14 0.0000E+00 0.0000E+00 0.0000E+00 S15 -1.7096E-06 1.8484E-07 -1.4517E-08 8.0166E-10 -2.9443E-11 6.4466E-13 -6.3590E-15 S16 -2.2693E-07 1.9950E-08 -1.3562E-09 6.6847E-11 -2.2086E-12 4.3276E-14 -3.7766E-16 S17 -6.0406E-08 3.0249E-09 -1.0649E-10 2.5178E-12 -3.6698E-14 2.7396E-16 -5.8138E-19 S18 3.3804E-08 -1.9853E-09 8.3763E-11 -2.4660E-12 4.7986E-14 -5.5375E-16 2.8667E-18

[0222] Figure 30The on-axis chromatic aberration curve of the second optical system of the imaging system of Embodiment 3 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 31 The astigmatism curves of the second optical system of the imaging system of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 32 The distortion curve of the second optical system of the imaging system of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 33 The magnification chromatic aberration curve of the second optical system of the imaging system of Embodiment 3 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the second optical system.

[0223] according to Figures 30 to 33 It can be seen that the second optical system given in Embodiment 3 can achieve good imaging quality.

[0224] Example 4

[0225] like Figures 34 to 44 As shown, the imaging system of Embodiment 4 is described.

[0226] Figures 34 to 39 The first optical system of the imaging system of Embodiment 4 is described. Figure 34 A schematic diagram of the structure of the first optical system in the first object distance state of this embodiment is shown. Figure 35 A schematic diagram of the first optical system in this embodiment in a second object distance state is shown. The first object distance state is an infinite distance state, and the second object distance state is a micro distance state.

[0227] like Figure 34 and Figure 35 As shown, the first optical system of this embodiment includes, in sequence from the object side to the image side along the optical axis of the first optical system, a first lens group G1-A, a first prism P1, a second lens group G2, a third lens group G3, a second prism P2, a protective glass E8, and an imaging surface S21.

[0228] The first lens group G1-A of the first optical system includes a first lens E1 with positive optical power, whose object-side surface S1 is convex and image-side surface S2 is convex. The second lens group G2 includes a second lens E2 with positive optical power, a third lens E3 with negative optical power, and a fourth lens E4 with positive optical power. The object-side surface S5 and image-side surface S6 of the second lens are convex. The object-side surface S7 of the third lens is convex, and the image-side surface S8 is concave. The object-side surface S9 and image-side surface S10 of the fourth lens are convex. The third lens group G3 includes a fifth lens E5 with negative optical power, a sixth lens E6 with positive optical power, and a seventh lens E7 with negative optical power. The object-side surface S11 of the fifth lens is concave, and the image-side surface S12 is convex. The object-side surface S13 of the sixth lens is concave, and the image-side surface S14 is convex. The object-side surface S15 of the seventh lens is convex, and the image-side surface S16 of the seventh lens is concave.

[0229] In this embodiment, the first optical system further includes an aperture stop STO, which is located on the object side of the first lens E1. The first prism P1 has an object-side surface S3 and an image-side surface S4. The second prism P2 has an object-side surface S17 and an image-side surface S18. The protective glass E8 has an object-side surface S19 and an image-side surface S20.

[0230] Table 16 shows the basic structural parameters of the first optical system in Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) represents the object distance.

[0231] Table 16

[0232]

[0233]

[0234] Table 17 shows the values ​​of D1, D2, and D3 of the first optical system in the first object distance state and the second object distance state, respectively. Wherein, D1 is the object distance, D2 is the distance on the optical axis from the image side surface S4 of the first prism to the object side surface S5 of the second lens, and D3 is the distance on the optical axis from the image side surface S10 of the fourth lens to the object side surface S11 of the fifth lens.

[0235] Table 17

[0236] D1(mm) D2 (mm) D3 (mm) First object distance state endless 4.1883 1.0416 Second object distance state 95.9687 1.8021 3.4279

[0237] In the first optical system of Embodiment 4, the object-side and image-side surfaces of the first lens E1 to the seventh lens E7 are all aspherical. Table 18 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each aspherical mirror S1-S16 that can be used in the first optical system of Embodiment 4.

[0238] Table 18

[0239]

[0240]

[0241] Figure 36 The on-axis chromatic aberration curve of the first optical system of the imaging system of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system. Figure 37 The astigmatism curve of the first optical system of the imaging system of Embodiment 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 38 The distortion curve of the first optical system of the imaging system of Embodiment 4 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 39 The magnification chromatic aberration curve of the first optical system of the imaging system of Embodiment 4 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the first optical system.

[0242] according to Figures 36 to 39 As can be seen, the first optical system given in Embodiment 4 can achieve good imaging quality.

[0243] Figures 40 to 44 The second optical system of the imaging system of Embodiment 4 is described. Figure 40 A schematic diagram of the structure of the second optical system in this embodiment is shown.

[0244] like Figure 40 As shown, the second optical system of this embodiment includes, in sequence from the object side to the image side along the optical axis of the second optical system, a first lens group G1-B, a first prism P1, a second lens group G2, a third lens group G3, a second prism P2, a protective glass E9, and an imaging surface S23.

[0245] The second optical system comprises a first lens group G1-B, which includes a first lens E1 with positive optical power and a second lens E2 with negative optical power. The object-side surface S1 and image-side surface S2 of the first lens are convex. The object-side surface S3 and image-side surface S4 of the second lens are concave. The second lens group G2 includes a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, and a fifth lens E5 with positive optical power. The object-side surface S7 and image-side surface S8 of the third lens are convex. The object-side surface S9 and image-side surface S10 of the fourth lens are concave. The object-side surface S11 and image-side surface S12 of the fifth lens are convex. The third lens group G3 includes a sixth lens E6 with negative optical power, a seventh lens E7 with positive optical power, and an eighth lens E8 with negative optical power. The object-side surface S13 of the sixth lens is concave, and the image-side surface S14 of the sixth lens is convex. The object-side surface S15 of the seventh lens is concave, and the image-side surface S16 of the seventh lens is convex. The object-side surface S17 of the eighth lens is convex, and the image-side surface S18 of the eighth lens is concave.

[0246] In this embodiment, the second optical system further includes an aperture stop STO, which is located on the object side of the first lens E1. The first prism P1 has an object-side surface S5 and an image-side surface S6. The second prism P2 has an object-side surface S19 and an image-side surface S20. The protective glass E8 has an object-side surface S21 and an image-side surface S22.

[0247] Table 19 shows the basic structural parameters of the second optical system in Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) represents the object distance.

[0248] Table 19

[0249] Face number Surface type radius of curvature Thickness / Distance Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless -0.6548 S1 aspherical 34.3031 1.2750 1.55 56.11 0.0000 S2 aspherical -43.5358 0.3125 0.0000 S3 aspherical 246.8969 0.6900 1.65 23.53 0.0000 S4 aspherical 67.0313 1.2420 0.0000 S5 spherical endless 8.2000 1.92 35.28 S6 spherical endless 13.8421 S7 aspherical 10.0439 1.3822 1.57 37.31 0.0000 S8 aspherical -8.9469 0.1955 0.0000 S9 aspherical 11.9243 0.6318 1.59 28.43 0.0000 S10 aspherical 2.8543 0.9991 -1.0000 S11 aspherical 15.2123 1.5970 1.55 56.11 0.0000 S12 aspherical -10.6417 0.7466 0.0000 S13 aspherical -4.1862 0.6635 1.55 56.11 0.0000 S14 aspherical -5.5994 0.7476 0.0000 S15 aspherical -7.7296 0.6300 1.65 23.53 0.0000 S16 aspherical -7.6758 0.2699 0.0000 S17 aspherical 10.4543 1.2452 1.55 56.11 0.0000 S18 aspherical 5.9445 0.7274 0.0000 S19 spherical endless 11.0000 1.92 35.28 S20 spherical endless 0.5447 S21 spherical endless 0.4000 1.52 64.17 S22 spherical endless 0.6188 S23 spherical endless

[0250] Table 20 below shows the higher-order coefficients A4-A30 of each aspherical lens S1-S18 in the second optical system that can be used in Embodiment 4. The surface shape of each aspherical lens is defined according to the above formula (1). In the second optical system, the object-side and image-side surfaces of the first lens E1 to the eighth lens E8 are both aspherical.

[0251] Table 20

[0252]

[0253]

[0254] Figure 41The on-axis chromatic aberration curve of the second optical system of the imaging system of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 42 The astigmatism curves of the second optical system of the imaging system of Embodiment 4 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 43 The distortion curve of the second optical system of the imaging system of Embodiment 4 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 44 The magnification chromatic aberration curve of the second optical system of the imaging system of Embodiment 4 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the second optical system.

[0255] according to Figures 41 to 44 As can be seen, the second optical system given in Example 4 can achieve good imaging quality.

[0256] Example 5

[0257] like Figures 45 to 55 As shown, the imaging system of Embodiment 5 is described.

[0258] Figures 45 to 50 The first optical system of the imaging system of Embodiment 5 is described. Figure 45 A schematic diagram of the structure of the first optical system in the first object distance state of this embodiment is shown. Figure 46 A schematic diagram of the first optical system in this embodiment in a second object distance state is shown. The first object distance state is an infinite distance state, and the second object distance state is a micro distance state.

[0259] like Figure 45 and Figure 46 As shown, the first optical system of this embodiment includes, in sequence from the object side to the image side along the optical axis of the first optical system, a first lens group G1-A, a first prism P1, a second lens group G2, a third lens group G3, a second prism P2, a protective glass E8, and an imaging surface S21.

[0260] The first lens group G1-A of the first optical system includes a first lens E1 with positive optical power, whose object-side surface S1 is convex and image-side surface S2 is convex. The second lens group G2 includes a second lens E2 with positive optical power, a third lens E3 with negative optical power, and a fourth lens E4 with positive optical power. The object-side surface S5 and image-side surface S6 of the second lens are convex. The object-side surface S7 of the third lens is convex, and the image-side surface S8 is concave. The object-side surface S9 and image-side surface S10 of the fourth lens are convex. The third lens group G3 includes a fifth lens E5, a sixth lens E6, and a seventh lens E7 with negative optical power. The object-side surface S11 of the fifth lens is concave, and the image-side surface S12 is convex. The object-side surface S13 of the sixth lens is concave, and the image-side surface S14 is convex. The object-side surface S15 of the seventh lens is convex, and the image-side surface S16 of the seventh lens is concave.

[0261] In this embodiment, the first optical system further includes an aperture stop STO, which is located on the object side of the first lens E1. The first prism P1 has an object-side surface S3 and an image-side surface S4. The second prism P2 has an object-side surface S17 and an image-side surface S18. The protective glass E8 has an object-side surface S19 and an image-side surface S20.

[0262] Table 21 shows the basic structural parameters of the first optical system in Embodiment 5, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) represents the object distance.

[0263] Table 21

[0264]

[0265]

[0266] Table 22 shows the values ​​of D1, D2, and D3 of the first optical system in the first object distance state and the second object distance state, respectively. Wherein, D1 is the object distance, D2 is the distance on the optical axis from the image side surface S4 of the first prism to the object side surface S5 of the second lens, and D3 is the distance on the optical axis from the image side surface S10 of the fourth lens to the object side surface S11 of the fifth lens.

[0267] Table 22

[0268] D1(mm) D2 (mm) D3 (mm) First object distance state endless 4.1800 1.0416 Second object distance state 96.2200 1.7800 3.4417

[0269] In the first optical system of Embodiment 5, the object-side and image-side surfaces of the first lens E1 to the seventh lens E7 are all aspherical. Table 23 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each aspherical mirror S1-S16 that can be used in the first optical system of Embodiment 5.

[0270] Table 23

[0271]

[0272]

[0273] Figure 47 The on-axis chromatic aberration curve of the first optical system of the imaging system of Embodiment 5 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the first optical system. Figure 48 The astigmatism curve of the first optical system of the imaging system of Embodiment 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 49 The distortion curve of the first optical system of the imaging system of Embodiment 5 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 50 The magnification chromatic aberration curve of the first optical system of the imaging system of Embodiment 5 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the first optical system.

[0274] according to Figures 47 to 50 It can be seen that the first optical system given in Example 5 can achieve good imaging quality.

[0275] Figures 51 to 55 The second optical system of the imaging system of Embodiment 5 is described. Figure 51 A schematic diagram of the structure of the second optical system in this embodiment is shown.

[0276] like Figure 51 As shown, the second optical system of this embodiment includes, in sequence from the object side to the image side along the optical axis of the second optical system, a first lens group G1-B, a first prism P1, a second lens group G2, a third lens group G3, a second prism P2, a protective glass E9, and an imaging surface S23.

[0277] The second optical system comprises a first lens group G1-B, which includes a first lens E1 with positive optical power and a second lens E2 with negative optical power. The object-side surface S1 and image-side surface S2 of the first lens are convex. The object-side surface S3 and image-side surface S4 of the second lens are concave. The second lens group G2 includes a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, and a fifth lens E5 with positive optical power. The object-side surface S7 and image-side surface S8 of the third lens are convex. The object-side surface S9 and image-side surface S10 of the fourth lens are concave. The object-side surface S11 and image-side surface S12 of the fifth lens are convex. The third lens group G3 includes a sixth lens E6, a seventh lens E7 with negative optical power, and an eighth lens E8 with negative optical power. The object-side surface S13 of the sixth lens is concave, and the image-side surface S14 of the sixth lens is convex. The object-side surface S15 of the seventh lens is concave, and the image-side surface S16 of the seventh lens is convex. The object-side surface S17 of the eighth lens is convex, and the image-side surface S18 of the eighth lens is concave.

[0278] In this embodiment, the second optical system further includes an aperture stop STO, which is located on the object side of the first lens E1. The first prism P1 has an object-side surface S5 and an image-side surface S6. The second prism P2 has an object-side surface S19 and an image-side surface S20. The protective glass E8 has an object-side surface S21 and an image-side surface S22.

[0279] Table 24 shows the basic structural parameters of the second optical system in Embodiment 5, where the units for radius of curvature and thickness / distance are millimeters (mm). In the table below, OBJ (not shown in the figure) represents the object distance.

[0280] Table 24

[0281]

[0282]

[0283] Table 25 below shows the higher-order coefficients A4-A30 of each aspherical lens S1-S18 in the second optical system that can be used in Embodiment 5. The surface shape of each aspherical lens is defined according to the above formula (1). In the second optical system, the object-side and image-side surfaces of the first lens E1 to the eighth lens E8 are both aspherical.

[0284] Table 25

[0285]

[0286]

[0287] Figure 52 The on-axis chromatic aberration curve of the second optical system of the imaging system of Embodiment 5 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the second optical system. Figure 53 The astigmatism curves of the second optical system of the imaging system of Embodiment 5 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 54 The distortion curve of the second optical system of the imaging system of Embodiment 5 is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 55 The magnification chromatic aberration curve of the second optical system of the imaging system of Embodiment 5 is shown, which represents the deviation of light at different image heights on the imaging surface after passing through the second optical system.

[0288] according to Figures 52 to 55 It can be seen that the second optical system given in Example 5 can achieve good imaging quality.

[0289] In summary, Examples 1 to 5 satisfy the relationships shown in Table 26.

[0290] Table 26

[0291]

[0292]

[0293] Table 27 shows the basic parameters of the first and second optical systems of the imaging systems of Embodiments 1 to 5. In the table below, fA3 is the focal length of the third lens of the first optical system, fA5 is the focal length of the fifth lens of the first optical system, fA6 is the focal length of the sixth lens of the first optical system, fA7 is the focal length of the seventh lens of the first optical system, fB1 is the focal length of the first lens of the second optical system, fB2 is the focal length of the second lens of the second optical system, fB3 is the focal length of the second lens, fB4 is the focal length of the fourth lens of the second optical system, fB7 is the focal length of the seventh lens of the second optical system, fAIN is the total focal length of the first optical system when it is in the first object distance state, and fAMA is the total focal length of the first optical system when it is in the second object distance state.

[0294] Table 27

[0295]

[0296] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging system described above.

[0297] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0298] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0299] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0300] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An imaging system, characterized in that, The imaging system consists of a first optical system and a second optical system. The first optical system has seven lenses with optical power, and the second optical system has eight lenses with optical power. The first optical system comprises, sequentially from the object side to the image side, a first lens group, a second lens group, and a third lens group along the optical axis of the first optical system. The first lens group includes a first lens with positive optical power, the object side of the first lens being convex, and the image side of the first lens being convex. The second lens group includes a second lens with positive optical power, a third lens with negative optical power, and a fourth lens with positive optical power. The object side of the second lens is convex, the object side of the third lens is convex, and the image side of the third lens is concave. The object-side surface of the first lens is convex, and the image-side surface of the fourth lens is convex. The third lens group includes a fifth lens with negative optical power, a sixth lens with negative or positive optical power, and a seventh lens with negative optical power. The object-side surface of the fifth lens is concave, and the image-side surface of the fifth lens is convex. The object-side surface of the seventh lens is convex, and the image-side surface of the seventh lens is concave. The second lens group of the first optical system is movably arranged on the optical axis to realize the change of the first optical system between a first object distance state and a second object distance state. The second optical system comprises, sequentially from the object side to the image side, a first lens group, a second lens group, and a third lens group along the optical axis of the second optical system. The first lens group of the second optical system includes a first lens with positive optical power and a second lens with negative optical power. The object side and image side of the first lens are convex. The second lens group of the second optical system includes a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens with positive optical power. The object side and image side of the third lens are convex, the object side and image side of the fourth lens are convex, and the object side and image side of the fifth lens are both convex. The third lens group of the second optical system includes a sixth lens with negative optical power, a seventh lens with either negative or positive optical power, and an eighth lens with negative optical power. The object side and image side of the sixth lens are both concave, and the object side and image side of the eighth lens are both convex. Wherein, the combined focal length FAG2 of the second lens group of the first optical system and the change in total focal length Δf of the first optical system when changing from the first object distance state to the second object distance state satisfy the following: 3.10<FAG2 / Δf<3.70; the combined focal length FBG1 of the first lens group of the second optical system and the combined focal length FAG1 of the first lens group of the first optical system satisfy the following: 8.30≤(FBG1+FAG1) / (FBG1-FAG1)≤9.

90.

2. The imaging system according to claim 1, characterized in that, The combined focal length FAG3 of the third lens group of the first optical system, the center thickness CTA5 of the fifth lens of the first optical system on the optical axis, the center thickness CTA6 of the sixth lens of the first optical system on the optical axis, and the center thickness CTA7 of the seventh lens of the first optical system on the optical axis satisfy the following: -6.62≤FAG3 / (CTA5+CTA6+CTA7)≤-5.

61.

3. The imaging system according to claim 1, characterized in that, When the first optical system changes from the first object distance state to the second object distance state, the distance ΔT that the second lens group of the first optical system moves along the optical axis, the focal length fA2 of the second lens of the first optical system and the focal length fA4 of the fourth lens of the first optical system satisfy the following: 1.65mm≤ΔT×(fA2 / fA4)≤4.85mm.

4. The imaging system according to claim 1, characterized in that, The radius of curvature RB1 of the object side surface of the first lens of the second optical system and the radius of curvature RA1 of the object side surface of the first lens of the first optical system satisfy the following condition: 1.06≤RB1 / RA1≤1.

60.

5. The imaging system according to claim 1, characterized in that, The curvature radius RA3 of the object side of the second lens of the first optical system, the curvature radius RA8 of the image side of the fourth lens of the first optical system, and the combined focal length FAG2 of the second lens group of the first optical system satisfy the following condition: 1.20 < (RA3 - RA8) / FAG2 < 1.

65.

6. The imaging system according to claim 1, characterized in that, The combined focal length FBG1 of the first lens group of the second optical system, the combined focal length FBG2 of the second lens group of the second optical system, and the combined focal length FBG3 of the third lens group of the second optical system satisfy the following condition: 29.29≤FBG1 / (FBG2+FBG3)≤47.

30.

7. The imaging system according to claim 1, characterized in that, The total focal length fB of the second optical system and the change in total focal length Δf of the first optical system when changing from the first object distance state to the second object distance state satisfy the following condition: 5.85 < fB / Δf < 6.

40.

8. The imaging system according to claim 1, characterized in that, The focal length fA1 of the first lens of the first optical system and the center thickness CTA1 of the first lens of the first optical system on the optical axis satisfy the following condition: 19.93≤fA1 / CTA1≤24.

03.

9. The imaging system according to claim 1, characterized in that, The combined focal length FBG2 of the second lens group of the second optical system satisfies the following relationship with the distance ΔT that the second lens group of the first optical system moves along the optical axis when the first optical system changes from the first object distance state to the second object distance state: 6.95≤FBG2 / ΔT≤7.

57.

10. The imaging system according to claim 1, characterized in that, The radius of curvature RA8 of the image side of the fourth lens of the first optical system, the radius of curvature RA9 of the object side of the fifth lens of the first optical system, and the distance ΔT that the second lens group of the first optical system moves along the optical axis when the first optical system changes from the first object distance state to the second object distance state satisfy the following: -6.83≤(RA8+RA9) / ΔT≤-6.

12.

11. The imaging system according to claim 1, characterized in that, The combined focal length FBG1 of the first lens group of the second optical system, the center thickness CTB1 of the first lens of the second optical system on the optical axis, and the center thickness CTB2 of the second lens of the second optical system on the optical axis satisfy the following: 23.32≤FBG1 / (CTB1+CTB2)≤26.

03.

12. The imaging system according to claim 1, characterized in that, The combined focal length FAG2 of the second lens group of the first optical system, the center thickness CTA2 of the second lens of the first optical system on the optical axis, and the center thickness CTA4 of the fourth lens of the first optical system on the optical axis satisfy the following: 5.55 < FAG2 / (CTA2+CTA4) < 6.

20.

13. The imaging system according to claim 1, characterized in that, The focal lengths fB6 of the sixth lens of the second optical system, fB8 of the eighth lens of the second optical system, and fB5 of the fifth lens of the second optical system satisfy the following condition: -19.95≤(fB6+fB8) / fB5≤-5.

49.

14. The imaging system according to any one of claims 1 to 13, characterized in that, The imaging system further includes a first prism and a second prism, wherein the first prism is located between the first lens group and the second lens group of the first optical system, or the first prism is located between the first lens group and the second lens group of the second optical system. The second prism is located between the third lens group and the imaging plane of the first optical system.

15. The imaging system according to claim 14, characterized in that, The first prism is movably disposed, and the switching between the first optical system and the second optical system is realized by adjusting the position of the first prism; the second lens group of the first optical system is shared with the second lens group of the second optical system, and the third lens group of the first optical system is shared with the third lens group of the second optical system.

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