Optical system and camera module

Abstract

The present application discloses an optical system and an imaging module. The optical system includes a first element group and a second element group. The first element group includes a first lens with a positive optical power, a reflecting element, and a second lens with a negative optical power. The reflecting element is used to reflect the light emitted from the first lens. The second element group includes at least one lens. Among them, the optical system satisfies: -0.6 < f1 / f2 < -0.3, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens.

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to an optical system and a camera module. Background Art

[0002] With the rapid development of portable devices such as smart phones, telephoto lenses have been widely used due to their advantages of clear imaging of distant objects, large magnification, and the ability to present the detailed features of objects.

[0003] The effective focal length of an optical system is an important criterion for measuring whether the optical system is a telephoto lens. The larger the effective focal length of the optical system, the clearer the distant objects photographed by the optical system. However, the effective focal length of an optical system is proportional to the optical path required by the optical system, that is, the larger the effective focal length of the optical system, the greater the optical path required by the optical system. Therefore, in order to achieve the telephoto characteristics of the optical system, the total length of the existing optical system is usually large, which will seriously limit the application of the optical system in portable devices. Summary of the Invention

[0004] One aspect of this application provides such an optical system, which includes a first element group and a second element group. The first element group includes a first lens with a positive optical power, a reflecting element, and a second lens with a negative optical power. The reflecting element is used to reflect the light emitted from the first lens. The second element group includes at least one lens. Wherein, the optical system satisfies: -0.6 < f1 / f2 < -0.3, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens.

[0005] According to an exemplary embodiment of this application, the optical system also satisfies: Tan(FOV / 2) < 0.38, where FOV is the maximum field of view angle of the optical system.

[0006] According to an exemplary embodiment of this application, the optical system also satisfies: 3.0 < D1 / CT1 < 6.0, where D1 is the maximum effective semi-aperture of the first lens and CT1 is the central thickness of the first lens on the optical axis.

[0007] According to an exemplary embodiment of this application, the optical system also satisfies: 3.0 < FG1 / EFL < 5.0, where FG1 is the effective focal length of the first element group and EFL is the effective focal length of the optical system.

[0008] According to an exemplary embodiment of this application, the optical system also satisfies: 2.5 < FG1 / FG2 < 4.5, where FG1 is the effective focal length of the first element group and FG2 is the effective focal length of the second element group.

[0009] According to an exemplary embodiment of the present application, the optical system further satisfies: 7.5mm < EFL / (FG1 / FG2) < 11.5mm, where FG1 is the effective focal length of the first lens group, FG2 is the effective focal length of the second lens group, and EFL is the effective focal length of the optical system.

[0010] According to an exemplary embodiment of the present application, the optical system further satisfies: 0.04mm -1 <D2x / EPDx / d12 < 0.12mm -1 where D2x is the maximum effective semi-aperture of the second lens in the first direction, EPDx is the entrance pupil diameter of the optical system in the first direction, and d12 is the on-axis distance from the image side of the first lens to the object side of the second lens.

[0011] According to an exemplary embodiment of the present application, the optical system further satisfies: 0.04mm -1 <D2y / EPDy / d12 < 0.12mm -1 where D2y is the maximum effective semi-aperture of the second lens in the second direction, EPDy is the entrance pupil diameter of the optical system in the second direction, and d12 is the on-axis distance from the image side of the first lens to the object side of the second lens.

[0012] According to an exemplary embodiment of the present application, the optical system further satisfies: -0.15 < fs1 / fs2 < 0.8, where fs1 is the effective focal length of the object side of the first lens and fs2 is the effective focal length of the image side of the first lens.

[0013] According to an exemplary embodiment of the present application, the optical system further satisfies: 0.5 < EFL / SL < 0.7, where EFL is the effective focal length of the optical system and SL is the total length of the optical system along the direction of the preset principal optical axis.

[0014] According to an exemplary embodiment of the present application, the optical system further satisfies: OBJmin ≥ 15.0cm, where OBJmin is the minimum value of the object distance of the optical system.

[0015] According to an exemplary embodiment of the present application, the optical axis includes a first optical axis and a second optical axis at a preset angle; the reflecting element includes a plane mirror, and the plane mirror receives the light rays emitted by the first lens along the direction of the first optical axis and reflects the light rays and emits them along the direction of the second optical axis to the second lens.

[0016] According to an exemplary embodiment of the present application, the second lens group includes a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power.

[0017] According to an exemplary embodiment of the present application, the position of the first element group relative to the image plane disposed on the image side is fixed, and the distance between the second element group and the first element group on the optical axis is adjustable.

[0018] Another aspect of the present application provides a camera module, which includes the above-mentioned optical system and an imaging element for converting an optical image formed by the optical system into an electrical signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which:

[0020] Figure 1 A schematic structural diagram of an optical system according to the present application is shown;

[0021] Figure 2 A schematic structural diagram of an optical system in a first state according to Embodiment 1 of the present application is shown;

[0022] Figure 3 A schematic structural diagram of an optical system in a second state according to Embodiment 1 of the present application is shown;

[0023] Figure 4A , Figure 4B and Figure 4C The axial chromatic aberration curve, the astigmatism curve and the distortion curve are respectively shown when the optical system of Example 1 of the present application is in the first state;

[0024] Figure 5 A schematic structural diagram of an optical system in a first state according to Embodiment 2 of the present application is shown;

[0025] Figure 6 A schematic structural diagram of an optical system in a second state according to Embodiment 2 of the present application is shown;

[0026] Fig. 7A , Figure 7B and Figure 7C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 2 of the present application when being in the first state are respectively shown;

[0027] Figure 8 A schematic structural diagram of an optical system in a first state according to Embodiment 3 of the present application is shown;

[0028] Fig. 9 A schematic structural diagram of an optical system in a second state according to Embodiment 3 of the present application is shown;

[0029] Fig. 10A , Fig. 10B and Fig. 10CThe axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 3 of the present application when the optical system is in the first state are respectively shown;

[0030] Fig.11 A schematic structural diagram of an optical system in a first state according to Embodiment 4 of the present application is shown;

[0031] Fig.12 shows a schematic structural diagram of an optical system in a second state according to Embodiment 4 of the present application;

[0032] Fig.13A , Fig. 13B and Fig. 13C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 4 of the present application in the first state are respectively shown;

[0033] Fig.14 shows a schematic structural diagram of an optical system in a first state according to Embodiment 5 of the present application;

[0034] Fig.15 shows a schematic structural diagram of an optical system in a second state according to Embodiment 5 of the present application;

[0035] Fig.16A , Fig. 16B and Fig. 16C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 5 of the present application in the first state are respectively shown;

[0036] Fig.17 shows a schematic structural diagram of an optical system in a first state according to Embodiment 6 of the present application;

[0037] Fig.18 shows a schematic structural diagram of an optical system in a second state according to Embodiment 6 of the present application;

[0038] Fig.19A , Fig.19B and Fig.19C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 6 of the present application when the optical system is in the first state are respectively shown;

[0039] Fig. 20 shows a schematic structural diagram of an optical system in a first state according to Embodiment 7 of the present application;

[0040] Fig.21 shows a schematic structural diagram of an optical system in a second state according to Embodiment 7 of the present application;

[0041] Fig.22A , Fig. 22B and Fig. 22CThe axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 7 of the present application in the first state are respectively shown;

[0042] Fig.23 shows a schematic structural diagram of an optical system in a first state according to Embodiment 8 of the present application;

[0043] Fig.24 shows a schematic structural diagram of an optical system in a second state according to Embodiment 8 of the present application;

[0044] Fig.25A , Fig.25B and Fig.25C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 8 of the present application in the first state are respectively shown;

[0045] Fig.26 shows a schematic structural diagram of an optical system in a first state according to Embodiment 9 of the present application;

[0046] Fig. 27 shows a schematic structural diagram of an optical system in a second state according to Embodiment 9 of the present application;

[0047] Fig.28A , Fig.28B and Fig.28C The axial chromatic aberration curve, the astigmatism curve and the distortion curve are respectively shown when the optical system of Example 9 of the present application is in the first state;

[0048] Fig.29 shows a structural schematic diagram of an optical system in a first state according to Embodiment 10 of the present application;

[0049] Fig.30 shows a schematic structural diagram of an optical system in a second state according to Embodiment 10 of the present application;

[0050] Fig.31A , Fig.31B and Fig. 31C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 10 of the present application in the first state are respectively shown;

[0051] Fig.32 shows a schematic structural diagram of an optical system in a first state according to Embodiment 11 of the present application;

[0052] Fig.33 shows a schematic structural diagram of an optical system in a second state according to Embodiment 11 of the present application;

[0053] Fig.34A , Fig.34B and Fig.34CThe axial chromatic aberration curve, the astigmatism curve and the distortion curve are respectively shown when the optical system of Example 11 of the present application is in the first state;

[0054] Fig.35 shows a schematic structural diagram of an optical system in a first state according to Embodiment 12 of the present application;

[0055] Fig.36 A schematic diagram showing the structure of the optical system in the second state according to Embodiment 12 of the present application; and

[0056] Fig.37A , Fig.37B and Fig.37C The axial chromatic aberration curve, the astigmatism curve and the distortion curve are respectively shown when the optical system of Example 12 of the present application is in the first state.

[0057] Illustration Description:

[0058] 10, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, optical system;

[0059] E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; E5, fifth lens; E6, sixth lens; E7, seventh lens; E8, filter; P, reflective element; STO, aperture; G1, first element group; G2, second element group; IMA, image plane. DETAILED DESCRIPTION

[0060] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0061] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0062] In the 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 shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0063] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0064] It should also be understood that the terms "including" and / or "having", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when describing the embodiments of the present application, the term "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0065] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0066] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0067] The periscope camera module is a common camera module for long-distance shooting. For the optical system in the periscope camera module, the optical system can be provided with a prism, which increases the effective focal length of the periscope camera module by folding the light path, thereby reducing the total length of the periscope camera module while meeting the long focal length shooting requirements, thereby realizing the miniaturization of the periscope camera module.

[0068] Aperture is an important parameter of the periscope camera module, which directly affects the periscope camera module's night scene, snapshot, background blur, video and other functions. For example, a periscope camera module with a large aperture can increase the blurred background of the photo and highlight the subject, while also increasing the shutter speed and focus speed to ensure that the periscope camera module obtains better imaging quality.

[0069] However, the current optical system of the periscope camera module still has some shortcomings. Due to the size restrictions of the light-entering and light-exiting surfaces of the prism, the area of ​​the prism that receives light is limited, which results in less light entering the optical system and a smaller effective aperture of the optical system, resulting in poor dark light effects and blurring effects in the periscope camera module. When the aperture of the periscope camera module becomes larger, the size and weight of the prism will increase accordingly, resulting in an increase in the size and weight of the periscope camera module. It can be seen that the large aperture requirement of the periscope camera module is inconsistent with the miniaturization development trend of the periscope camera module.

[0070] In addition, periscope camera modules usually use motors to drive prisms to move to achieve optical image stabilization. Larger and heavier prisms place higher demands on the thrust of the motors, and larger and heavier prisms take up more space in periscope camera modules, which results in less space available for the motors, affecting the driving effect of the motors. The dual requirements of large driving force and small installation space undoubtedly place higher demands on the motors.

[0071] In order to at least partially solve one or more of the above-mentioned problems and other potential problems, the present application provides an optical system. Specifically, it can reduce the overall height and overall length of the optical system while achieving a large aperture in the optical system, and improve the imaging quality and optical image stabilization performance of the optical system.

[0072] Figure 1 The schematic diagram of the structure of the optical system according to the present application is shown. The optical system can be applied to a camera module, for example, and the camera module can be a periscope camera module. It should be understood that the optical system can also be applied to other camera modules, and the present application does not make specific restrictions on this.

[0073] refer to Figure 1 , the optical system 10 may include a first element group G1 and a second element group G2 in sequence from the object side to the image side along the optical axis. The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The first lens E1 may have a positive optical power. The reflective element P may be used to reflect the light emitted from the first lens E1. The second lens E2 may have a negative optical power. The second element group G2 may include at least one lens. The image side of the optical system 10 may be provided with an image plane IMA.

[0074] The first lens E1 can converge the light, so that the light is still in a converged state after being reflected by the reflective element P, and the number of light entering the second lens E2 is increased, thereby increasing the effective aperture of the optical system 10, improving the imaging quality of the optical system 10, and can also reduce the optical effective aperture of the lenses in the second element group G2, reduce the shoulder height of the second element group G2, and thus reduce the overall height of the optical system 10. The second lens E2 can expand the light and improve the optical anti-shake performance of the optical system 10.

[0075] In an exemplary embodiment, reference Figure 1 The reflective element P can be set at any desired angle to bend the light path. The reflective element P can be set to deflect the incident light path by a preset degree (for example, but not limited to 90°), for example, the incident light path is transformed from propagating along the first optical axis (abbreviated as, optical axis I) to propagating along the second optical axis (abbreviated as, optical axis II). It should be understood that the optical axis herein may include the first optical axis and the second optical axis at a preset angle.

[0076] In an exemplary embodiment, reference Figure 1 , the reflective element P can be disposed between the first lens E1 and the second lens E2. That is, the first lens E1 can be located on the optical axis I and disposed between the object side and the reflective element P, and the second lens E2 can be located on the optical axis II and disposed between the reflective element P and the second element group G2. The reflective element P can receive the light emitted from the first lens E1 along the direction of the optical axis I, and reflect the light and emit it into the second lens E2 along the direction of the optical axis II. Wherein, the optical axis I and the optical axis II are at a preset angle, for example but not limited to, the optical axis I is perpendicular to the optical axis II.

[0077] In an exemplary embodiment, reference Figure 1 , the reflective element P may be a plane reflector, and the plane reflector may have a reflective surface. The light emitted from the first lens E1 in the direction of the optical axis I is totally reflected by the reflective surface of the reflective element P and is emitted into the second lens E2 in the direction of the optical axis II. The reflective surface of the reflective element P passes through the intersection of the optical axis I and the optical axis II, that is, the reflective surface of the reflective element P is located on both the optical axis I and the optical axis II. By adopting a plane reflector of smaller weight and size as the reflective element P, when the optical system 10 realizes a large aperture, the weight and size of the first element group G1 can be constrained within a certain range, the weight and size of the optical system 10 can be reduced as much as possible, and the driving burden of the reflective element P can be reduced.

[0078] In an exemplary embodiment, the first lens E1 can be used to converge light. By making the first lens E1 have a convergence effect on light, the light can be kept in a convergence state after being reflected by the reflective element P, increasing the number of light entering the second lens E2 and increasing the effective aperture of the optical system 10; at the same time, under the convergence effect of the first lens E1 on light, even if the light is subsequently expanded by the second lens E2, the aperture of the expanded light when entering the second element group G2 will still be smaller than the aperture of the light when entering the first lens E1, which is conducive to reducing the optical effective aperture of the lens in the second element group G2, thereby reducing the shoulder height of the second element group G2.

[0079] In an exemplary embodiment, the second lens E2 can expand the light reflected by the reflective element P. By making the second lens E2 have a beam expansion effect on the light, the light emitted from the second lens E2 can be incident on the second element group G2 in a direction close to being parallel to the optical axis II, that is, the light at each position of the edge propagates in a direction close to being parallel to the optical axis II, and when the reflective element P is driven to achieve optical image stabilization, the movement of the reflective element P has little effect on the position of the light on the second element group G2, and the MTF drop value of the optical system 10 is small, that is, the image stabilization sensitivity is low.

[0080] If the second lens E2 has no optical power or has positive optical power, the light is still in a state of converging toward the center when it reaches the second element group G2. When the reflective element P is driven to achieve optical image stabilization, the reflective element P moves, resulting in different deflection angles of the light at various positions on the edge. Specifically, when the reflective element P is driven to move for optical image stabilization, the light will shift in the same direction, resulting in different deflection angles of the light at various positions on the edge after passing through the reflective element P. The light reaching various positions on the edge of the second element group G2 has different deflection angles, and the MTF drop value of the optical system 10 is large, that is, the anti-shake sensitivity is high.

[0081] In an exemplary embodiment, there may be a spacing distance between the first lens E1 and the reflective element P. There may be a spacing distance between the second lens E2 and the reflective element P. By providing a spacing between the first lens E1, the second lens E2 and the reflective element P, multiple options can be provided for the surface design of the side surface of the first lens E1 and the second lens E2 close to the reflective element P, thereby improving the flexibility of the surface design of the side surface of the first lens E1 and the second lens E2 close to the reflective element P.

[0082] It should be understood that the spacing distance between the first lens E1 and the reflective element P means that a surface of one side of the first lens E1 close to the reflective element P has a certain gap with at least a portion of the reflective element P, rather than the first lens E1 is completely non-contacting with the reflective element P. Similarly, the spacing distance between the second lens E2 and the reflective element P means that a surface of one side of the second lens E2 close to the reflective element P has a certain gap with at least a portion of the reflective element P, rather than the second lens E2 is completely non-contacting with the reflective element P.

[0083] In an exemplary embodiment, at least one surface of the first lens E1 and / or the second lens E2 is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0084] As an example, the object-side surface of the first lens E1 may be a convex surface, and the image-side surface may be a convex surface or a concave surface.

[0085] As an example, the object-side surface of the second lens E2 may be a concave surface, and the image-side surface may be a convex surface or a concave surface.

[0086] In an exemplary embodiment, reference Figure 1 The second element group G2 may include a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged in sequence from the object side to the image side. The third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 may be arranged in sequence from the second lens E2 to the image side along the optical axis II.

[0087] As an example, the third lens E3 may have positive power. The fourth lens E4 may have negative power. The fifth lens E5 may have positive power. The sixth lens E6 may have positive power. The seventh lens E7 may have negative power.

[0088] As an example, the second element group G2 may further include a stop STO, which may be disposed, for example, between the second lens E2 and the third lens E3.

[0089] It should be understood that the number of lenses included in the second element group G2 is only exemplary, and the present application does not impose any specific limitation on the number of lenses included in the second element group G2.

[0090] In an exemplary embodiment, reference Figure 1The optical system 10 may further include a filter E8. The filter E8 may be disposed on the image side of the second element group G2 and is used to filter the light emitted from the second element group G2. The filter E8 may be, for example, an infrared filter.

[0091] In an exemplary embodiment, reference Figure 1 When light enters the optical system 10, first, the light enters the first lens E1 along the direction of the optical axis I and reaches the reflective element P after being converged by the first lens E1, and then is totally reflected by the reflective element P and turns along the direction of the optical axis II to enter the second lens E2 and is expanded by the second lens E2; then, the light expanded by the second lens E2 enters the second element group G2, and passes through the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 in sequence, and reaches the filter E8, and finally reaches the image plane IMA after passing through the filter E8.

[0092] By adopting the first lens E1, the reflective element P and the second lens E2, the aperture of the optical system 10 can be increased, so that the optical system 10 can obtain higher image brightness, and the imaging quality and optical anti-shake performance of the optical system 10 are improved, while the weight and size of the optical system 10 can be reduced.

[0093] In an exemplary embodiment, reference Figure 1 , the first element group G1 can be fixed on the optical axis (such as optical axis II) relative to the image plane IMA. The second element group G2 can move along the optical axis (such as optical axis II) relative to the first element group G1, that is, the distance between the second element group G2 and the first element group G1 on the optical axis (such as optical axis II) is adjustable. When the distance between the object and the optical system 10 changes from far to near, adjusting the distance between the second element group G2 and the first element group G1 on the optical axis (such as optical axis II) can enable the optical system 10 to switch between the first state and the second state, thereby realizing the focusing function of the optical system 10. For example, when the object is infinitely far away from the optical system 10, the optical system 10 is in the first state (such as the long-distance state); when the object is at a preset distance from the optical system 10, the optical system 10 is in the second state (such as the close-distance state).

[0094] In an exemplary embodiment, reference Figure 2 and Figure 3 When the distance between the object and the optical system 10 changes from far to near, the second element group G2 can move along the optical axis II toward the direction close to the first element group G1, so that the optical system 10 switches from the first state to the second state. When the distance between the object and the optical system 10 changes from near to far, the second element group G2 can move along the optical axis II toward the direction away from the first element group G1, so that the optical system 10 switches from the second state to the first state.

[0095] In an exemplary embodiment, during the focusing process of the optical system 10 , the maximum movement stroke of the second element group G2 may be within a range of 5.5 mm to 7.0 mm.

[0096] In an exemplary embodiment, the optical system 10 may further include a lens barrel assembly (not shown). The lens barrel assembly may include a first lens barrel and a second lens barrel. The first element group G1 may be fixed in the first lens barrel. The second element group G2 may be fixed in the second lens barrel. During the focusing process of the optical system 10, the first lens barrel and the first element group G1 may be fixed relative to the position of the image plane IMA on the optical axis II, and the second lens barrel and the second element group G2 may move along the optical axis II in a direction close to the first element group G1, or the second lens barrel and the second element group G2 may move along the optical axis II in a direction away from the first element group G1. It should be understood that when the optical system 10 implements the focusing function, the second lens barrel and the second element group G2 may be driven by a motor (not shown) to move along the optical axis II, and the first lens barrel and the first element group G1 may not move.

[0097] In an exemplary embodiment, the optical system 10 may further include a barrel assembly (not shown). The first element group G1 may be fixed in the barrel assembly. The second element group G2 may be movably arranged in the barrel assembly. During the focusing process of the optical system 10, the barrel assembly and the first element group G1 may be fixed relative to the position of the image plane IMA on the optical axis II, and the second element group G2 may move along the optical axis II in a direction close to the first element group G1, or the second element group G2 may move along the optical axis II in a direction away from the first element group G1. It should be understood that when the optical system 10 realizes the focusing function, the second element group G2 may be driven by a motor (not shown) to move along the optical axis II, and the barrel assembly and the first element group G1 may not move.

[0098] In an exemplary embodiment, the optical system 10 may also satisfy: OBJmin≥15.0 cm, where OBJmin is the minimum value of the object distance of the optical system 10. The object distance may be, for example, the distance between the object to be photographed and the optical system 10. As an example, 15.0 cm≤OBJmin<25 cm. By controlling the above conditional expression, the optical system 10 can be imaged under the condition that the object distance is greater than or equal to 15.0 cm, and the imaging effect is good.

[0099] In an exemplary embodiment, the magnification of the optical system 10 may be greater than or equal to 5X and less than or equal to 10X.

[0100] In an exemplary embodiment, the optical system 10 may satisfy: -0.6 < f1 / f2 < -0.3, where f1 is the effective focal length of the first lens E1, and f2 is the effective focal length of the second lens E2. By reasonably configuring the ratio of the effective focal lengths of the first lens E1 and the second lens E2, the first lens E1 can have a strong light converging ability, a strong effect on enlarging the aperture, and ensure that the light remains in a converging state after being reflected by the reflecting element P, which is beneficial to reducing the aperture of the second lens E2, and further reducing the optical effective aperture of the lenses in the second element group G2 and the shoulder height of the second element group G2; at the same time, it can also make the angle between the light emitted from the second lens E2 and the optical axis II within a small range, improving the optical anti-shake performance of the optical system 10. If the value of f1 / f2 is too small, it will cause the first lens E1 to have too strong a light converging ability, and the light enters the second lens E2 and the second element group G2 at too small an incident angle, resulting in an increase in the gap between the second lens E2 and the second element group G2 or an increase in the shoulder height of the second element group G2, and an increase in the total length or total height of the optical system 10.

[0101] In an exemplary embodiment, the optical system 10 may also satisfy: 3.0 < D1 / CT1 < 6.0, where D1 is the maximum effective semi-aperture of the first lens E1, and CT1 is the central thickness of the first lens E1 on the optical axis (such as the optical axis I). D1 may be, for example, the maximum value of the effective semi-aperture of the object side of the first lens E1 and the effective semi-aperture of the image side of the first lens E1. By reasonably configuring the ratio of the maximum effective semi-aperture of the first lens E1 to the central thickness of the first lens E1, when the processability of the first lens E1 meets the requirements, the total height of the optical system 10 can be reduced, and the structure of the optical system 10 can be made more compact, thereby reducing the volume of the optical system 10; at the same time, it is also beneficial to achieve a large aperture of the optical system 10.

[0102] In an exemplary embodiment, at least one of the first lens E1 to the seventh lens E7 may be a trimmed lens. The effective semi-apertures of the trimmed lens in the first direction and the second direction may be different. The first direction may be, for example, a direction perpendicular to the plane formed by the optical axis I and the optical axis II. The second direction may be, for example, a direction parallel to the optical axis I. By providing the trimmed lens, the total width of the second element group G2 in the first direction or the shoulder height of the second element group G2 can be further reduced, thereby reducing the total width of the optical system 10 in the first direction or the total height of the optical system 10.

[0103] In an exemplary embodiment, the optical system 10 may also satisfy: 0.04 mm -1 < D2x / EPDx / d12 < 0.12 mm -1, where s, D2x is the maximum effective semi-aperture of the second lens E2 in the first direction, EPDx is the entrance pupil diameter of the optical system 10 in the first direction, and d12 is the on-axis distance from the image side of the first lens E1 to the object side of the second lens E2. D2x can be, for example, the maximum value among the effective semi-aperture of the object side of the second lens E2 and the effective semi-aperture of the image side of the second lens E2 in the first direction. The first direction can be, for example, a direction perpendicular to the plane formed by the optical axis I and the optical axis II. By controlling the above conditional expression, while the optical system 10 meets the large aperture requirement, the effective aperture of the second lens E2 can be restricted within a reasonable range, which is beneficial to reducing the total width of the second element group G2 in the first direction, thereby reducing the total width of the optical system 10 in the first direction.

[0104] In an exemplary embodiment, the optical system 10 may further satisfy: 0.04mm -1 <D2y / EPDy / d12 < 0.12mm -1 , where D2y is the maximum effective semi-aperture of the second lens E2 in the second direction, EPDy is the entrance pupil diameter of the optical system 10 in the second direction, and d12 is the on-axis distance from the image side of the first lens E1 to the object side of the second lens E2. D2y can be, for example, the maximum value among the effective semi-aperture of the object side of the second lens E2 and the effective semi-aperture of the image side of the second lens E2 in the second direction. The second direction can be, for example, a direction parallel to the optical axis I. By controlling the above conditional expression, while the optical system 10 meets the large aperture requirement, the effective aperture of the second lens E2 can be restricted within a reasonable range, which is beneficial to reducing the shoulder height of the second element group G2, thereby reducing the total height of the optical system 10.

[0105] In an exemplary embodiment, the optical system 10 may further satisfy: 3.0 < FG1 / EFL < 5.0, where FG1 is the effective focal length of the first element group G1 and EFL is the effective focal length of the optical system 10. By reasonably configuring the ratio of the effective focal length of the first element group G1 to the effective focal length of the optical system 10, the optical system 10 can image an object relatively close to the optical system 10, ensuring that the optical system 10 has a large range of object distances that can be imaged; at the same time, it can also enable the first element group G1 to have a certain light converging ability, reduce the total width of the second element group G2 in the first direction and the shoulder height of the second element group G2, and ensure that the light enters the second element group G2 at a direction with a small angle to the optical axis II after passing through the first element group G1, which is beneficial to improving the optical image stabilization performance of the optical system 10.

[0106] In an exemplary embodiment, the optical system 10 may further satisfy: 2.5 < FG1 / FG2 < 4.5, where FG1 is the effective focal length of the first element group G1, and FG2 is the effective focal length of the second element group G2. By controlling the ratio of the effective focal length of the first element group G1 to the effective focal length of the second element group G2, the optical power of the first element group G1 and the second element group G2 can be reasonably allocated, so that the optical system 10 can image an object relatively close to the optical system 10, ensuring that the optical system 10 has a large range of object distances that can be imaged, and ensuring that the optical system 10 has good imaging quality at close range.

[0107] In an exemplary embodiment, the optical system 10 may further satisfy: 7.5 mm < EFL / (FG1 / FG2) < 11.5 mm, where FG1 is the effective focal length of the first element group G1, FG2 is the effective focal length of the second element group G2, and EFL is the effective focal length of the optical system 10. By controlling the above conditional expression, the optical power of the first element group G1 and the second element group G2 can be reasonably allocated, ensuring that when the optical system 10 photographs objects in different object distance states, the best focus can be achieved through the limited movement of the second element group G2, and the optical system 10 has good imaging performance at different object distances, improving the range of object distances that the optical system 10 can image.

[0108] In an exemplary embodiment, the optical system 10 may further satisfy: -0.15 < fs1 / fs2 < 0.8, where fs1 is the effective focal length of the object side surface of the first lens E1, and fs2 is the effective focal length of the image side surface of the first lens E1. Reasonably configuring the ratio of the effective focal length of the object side surface to the image side surface of the first lens E1 can enable the first lens E1 to have sufficient converging ability and limit the surface shape trend of the object side surface and the image side surface of the first lens E1, thereby reducing the shoulder height of the second element group G2 and reducing the total height of the optical system 10.

[0109] In an exemplary embodiment, the optical system 10 may further satisfy: 0.5 < EFL / SL < 0.7, where EFL is the effective focal length of the optical system 10, and SL is the total length of the optical system 10 along the direction of the preset principal optical axis. SL may be, for example, the total length of the optical system 10 along the direction of the optical axis II (such as Figure 1 ). Reasonably configuring the ratio of the effective focal length of the optical system 10 to the total length of the optical system 10 along the direction of the preset principal optical axis is beneficial to shortening the total length of the optical system 10 and thus reducing the volume of the optical system 10 when the optical system 10 realizes characteristics such as long focal length, large aperture, and a certain image plane size.

[0110] In an exemplary embodiment, the optical system 10 may further satisfy: Tan(FOV / 2) < 0.38, where FOV is the maximum field of view angle of the optical system 10. As an example, 0.05 < Tan(FOV / 2) < 0.25. Reasonably configuring the tangent value of half of the maximum field of view angle of the optical system 10 can enable the optical system 10 to have a smaller field of view angle, which is beneficial for the optical system 10 to image distant objects, thereby ensuring that the optical system 10 has good imaging quality at a long distance.

[0111] The optical system 10 according to the above embodiment of the present application may employ seven lenses and a reflection element P. By reasonably allocating the optical parameters of each lens and the reflection element P, when the size of the optical system 10 meets the requirements, it is beneficial for the optical system 10 to achieve characteristics such as long focal length and large aperture, improve the imaging quality and optical image stabilization performance of the optical system 10, and reduce the weight of the optical system 10.

[0112] In the present application, SL represents the total length of the optical system 10 in the direction of the preset principal optical axis. Specifically, SL is the distance between the first lens E1 and the image plane IMA along the optical axis II, and the preset principal optical axis may be the optical axis II. GH represents the shoulder height of the second element group G2. Specifically, GH is determined by the maximum effective aperture of the lenses within the second element group G2 in the second direction (for example, the direction parallel to the optical axis I). SH represents the total height of the optical system 10. Specifically, SH is the total height of the optical system 10 in the second direction (for example, the direction parallel to the optical axis I). The Modulation Transfer Function (MTF) is an important index for describing the imaging quality of the optical system 10, and the MTF can be obtained through simulation. The Optical Image Stabilizer (OIS) sensitivity is the drop value of the MTF, which represents the difference between the MTF and the static MTF design value under a unit jitter angle.

[0113] Those skilled in the art should understand that without departing from the technical solution required to be protected by the present application, the number of lenses constituting the optical system 10 can be changed to obtain the various results and advantages described in this specification.

[0114] The following further describes specific embodiments of the optical system 10 applicable to the above embodiments with reference to the accompanying drawings. Embodiment 1

[0115] The following refers to Figure 2 、 Figure 3 、 Figure 4A 、 Figure 4B and Figure 4C describe the optical system of Embodiment 1.

[0116] As Figure 2 and Figure 3 As shown, the optical system 100 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 100 may be 18 cm to infinity. The magnification of the optical system 100 may be 5X.

[0117] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0118] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 100 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 100 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 100. During the focusing process of the optical system 100, the maximum movement stroke of the second element group G2 can be 6.5478 mm.

[0119] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is convex. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is concave. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The seventh lens E7 may have negative power, and its object side surface S14 is convex, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0120] Table 1 shows a basic parameter table of the optical system 100 of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0121] Table 1

[0122]

[0123] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Figure 2 and Figure 3 .

[0124] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 100 changes.

[0125] When the object is infinitely far from the optical system 100, the optical system 100 is in the first state. The structure diagram of the optical system 100 can be referred to Figure 2 , where W1=-8.6302mm, W2=-0.9286mm, effective focal length EFL of optical system 100=31.699mm, aperture value Fnox of optical system 100 in the first direction=1.72, aperture value Fnoy of optical system 100 in the second direction=2.45, maximum field of view FOV of optical system 100=20.2282°. When the object is at a predetermined distance from the optical system 100, the optical system 100 is in the second state. The structural diagram of the optical system 100 can be referred to Figure 3 .

[0126] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0127] (1)

[0128] Where X(Y) represents the relative distance between the point on the aspherical surface that is Y away from the optical axis and the tangent plane that is tangent to the optical axis of the aspherical surface; Y represents the vertical distance between the point on the aspherical curve and the optical axis; R represents the radius of curvature; K represents the cone coefficient; A m represents the i-th order Qcon aspheric coefficient; u=(Y / NR), where NR represents the normalized radius of the Qcon aspheric surface; Table 2 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0129] Table 2

[0130]

[0131] Figure 4A The axial chromatic aberration curve of the first state of the optical system 100 of Example 1 is shown, which indicates the deviation of the convergence point of light rays of different wavelengths after passing through the optical system 100 . Figure 4B The astigmatism curve of the first state of the optical system 100 of Example 1 is shown, which represents the meridional image curvature and the sagittal image curvature corresponding to different image heights. Figure 4C The distortion curve of the first state of the optical system 100 of Example 1 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 4A , Figure 4B and Figure 4C It can be seen that the optical system 100 of Example 1 can achieve good imaging quality in the first state. Example 2

[0132] The following reference Figure 5 , Figure 6 , Fig. 7A , Figure 7B and Figure 7C The optical system of Embodiment 2 is described.

[0133] like Figure 5 and Figure 6 As shown, the optical system 200 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 200 may be 18 cm to infinity. The magnification of the optical system 200 may be 5X.

[0134] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0135] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 200 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 200 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 200. During the focusing process of the optical system 200, the maximum movement stroke of the second element group G2 can be 6.7252 mm.

[0136] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is convex. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is convex. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The seventh lens E7 may have negative power, and its object side surface S14 is concave, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0137] Table 3 shows a basic parameter table of the optical system 200 of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0138] Table 3

[0139]

[0140] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Figure 5 and Figure 6 .

[0141] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 200 changes.

[0142] When the object is infinitely far from the optical system 200, the optical system 200 is in the first state. The structure diagram of the optical system 200 can be referred to Figure 5 , where W1=-8.7125mm, W2=-0.1506mm, effective focal length EFL of optical system 200=31.7mm, aperture value Fnox of optical system 200 in the first direction=2.35, aperture value Fnoy of optical system 200 in the second direction=3.35, maximum field angle FOV of optical system 200=20.2178°. When the object is at a predetermined distance from the optical system 200, the optical system 200 is in the second state. The structure diagram of the optical system 200 can be referred to Figure 6 .

[0143] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 4 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0144] Table 4

[0145]

[0146] Fig. 7A The axial chromatic aberration curve of the first state of the optical system 200 of Example 2 is shown, which indicates the deviation of the convergence point of light rays of different wavelengths after passing through the optical system 200. Figure 7B The astigmatism curve of the first state of the optical system 200 of Example 2 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature corresponding to different image heights. Figure 7CThe distortion curve of the first state of the optical system 200 of Example 2 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig. 7A , Figure 7B and Figure 7C It can be seen that the optical system 200 of Example 2 can achieve good imaging quality in the first state. Example 3

[0147] The following reference Figure 8 , Fig. 9 , Fig. 10A , Fig. 10B and Fig. 10C The optical system of Embodiment 3 is described.

[0148] like Figure 8 and Fig. 9 As shown, the optical system 300 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 300 may be 18 cm to infinity. The magnification of the optical system 300 may be 5X.

[0149] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0150] The first element group G1 is fixed relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 300 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 300 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 300. During the focusing process of the optical system 300, the maximum movement stroke of the second element group G2 can be 6.9378 mm.

[0151] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is concave. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is convex. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The seventh lens E7 may have negative power, and its object side surface S14 is concave, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0152] Table 5 shows a basic parameter table of the optical system 300 of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0153] Table 5

[0154]

[0155] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Figure 8 and Fig. 9 .

[0156] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 300 changes.

[0157] When the object is infinitely far from the optical system 300, the optical system 300 is in the first state. The structure diagram of the optical system 300 can be referred to Figure 8, where W1=-9.0597mm, W2=-0.1463mm, effective focal length EFL of optical system 300=31.74mm, aperture value Fnox of optical system 300 in the first direction=2.97, aperture value Fnoy of optical system 300 in the second direction=4.26, maximum field of view FOV of optical system 300=20.2178°. When the object is at a predetermined distance from the optical system 300, the optical system 300 is in the second state. The structure diagram of the optical system 300 can be referred to Fig. 9 .

[0158] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 6 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0159] Table 6

[0160]

[0161] Fig. 10A The axial chromatic aberration curve of the first state of the optical system 300 of Example 3 is shown, which indicates that the convergence point of light rays of different wavelengths after passing through the optical system 300 deviates. Fig. 10B The astigmatism curve of the first state of the optical system 300 of Example 3 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature corresponding to different image heights. Fig. 10C FIG. 3 shows a distortion curve of the first state of the optical system 300 of Example 3, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig. 10A , Fig. 10B and Fig. 10C It can be seen that the optical system 300 of Example 3 can achieve good imaging quality in the first state. Example 4

[0162] The following reference Fig.11 , Fig.12 , Fig.13A , Fig. 13B and Fig. 13C The optical system of Embodiment 4 is described.

[0163] like Fig.11 and Fig.12As shown, the optical system 400 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 400 may be 15.4576 cm to infinity. The magnification of the optical system 400 may be 8X.

[0164] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0165] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 400 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 400 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 400. During the focusing process of the optical system 400, the maximum movement stroke of the second element group G2 can be 5.7236 mm.

[0166] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is convex. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is concave. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The seventh lens E7 may have negative power, and its object side surface S14 is convex, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0167] Table 7 shows a basic parameter table of the optical system 400 of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0168] Table 7

[0169]

[0170] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Fig.11 and Fig.12 .

[0171] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 400 changes.

[0172] When the object is infinitely far from the optical system 400, the optical system 400 is in the first state. The structure diagram of the optical system 400 can be referred to Fig.11 , where W1=-7.7017mm, W2=-1.8106mm, effective focal length EFL of optical system 400=27.74mm, aperture value Fnox of optical system 400 in the first direction=1.7234, aperture value Fnoy of optical system 400 in the second direction=2.4582, maximum field of view FOV of optical system 400=12.298°. When the object is at a predetermined distance from optical system 400, optical system 400 is in the second state, and the structure diagram of optical system 400 can be referred to Fig.12 .

[0173] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 8 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0174] Table 8

[0175]

[0176] Fig.13A The axial chromatic aberration curve of the first state of the optical system 400 of Example 4 is shown, which indicates the deviation of the convergence point of light rays of different wavelengths after passing through the optical system 400. Fig. 13B The astigmatism curve of the first state of the optical system 400 of Example 4 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature corresponding to different image heights. Fig. 13C The distortion curve of the first state of the optical system 400 of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.13A , Fig. 13B and Fig. 13C It can be seen that the optical system 400 of Example 4 can achieve good imaging quality in the first state. Example 5

[0177] The following reference Fig.14 , Fig.15 , Fig.16A , Fig. 16B and Fig. 16C The optical system of Embodiment 5 is described.

[0178] like Fig.14 and Fig.15 As shown, the optical system 500 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 500 may be 16.0957 cm to infinity. The magnification of the optical system 500 may be 8X.

[0179] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0180] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 500 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 500 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 500. During the focusing process of the optical system 500, the maximum movement stroke of the second element group G2 can be 5.7245 mm.

[0181] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is convex. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is convex. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The seventh lens E7 may have negative power, and its object side surface S14 is convex, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0182] Table 9 shows a basic parameter table of the optical system 500 of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0183] Table 9

[0184]

[0185] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Fig.14 and Fig.15 .

[0186] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 500 changes.

[0187] When the object is infinitely far from the optical system 500, the optical system 500 is in the first state. The structure diagram of the optical system 500 can be referred to Fig.14, where W1=-7.6881mm, W2=-1.8116mm, effective focal length EFL of optical system 500=27.74mm, aperture value Fnox of optical system 500 in the first direction=2.3469, aperture value Fnoy of optical system 500 in the second direction=3.33543, maximum field of view FOV of optical system 500=12.2987°. When the object is at a predetermined distance from the optical system 500, the optical system 500 is in the second state. The structure diagram of the optical system 500 can be referred to Fig.15 .

[0188] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 10 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0189] Table 10

[0190]

[0191] Fig.16A The axial chromatic aberration curve of the first state of the optical system 500 of Example 5 is shown, which indicates the deviation of the convergence point of light rays of different wavelengths after passing through the optical system 500. Fig. 16B The astigmatism curve of the first state of the optical system 500 of Example 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature corresponding to different image heights. Fig. 16C The distortion curve of the first state of the optical system 500 of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.16A , Fig. 16B and Fig. 16C It can be seen that the optical system 500 of Example 5 can achieve good imaging quality in the first state. Example 6

[0192] The following reference Fig.17 , Fig.18 , Fig.19A , Fig.19B and Fig.19C The optical system of Embodiment 6 is described.

[0193] like Fig.17 and Fig.18As shown, the optical system 600 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 600 may be 16.4123 cm to infinity. The magnification of the optical system 600 may be 8X.

[0194] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0195] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 600 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 600 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 600. During the focusing process of the optical system 600, the maximum movement stroke of the second element group G2 can be 5.7243 mm.

[0196] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is concave. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is convex. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The seventh lens E7 may have negative power, and its object side surface S14 is convex, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0197] Table 11 shows a basic parameter table of the optical system 600 of Example 6, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0198] Table 11

[0199]

[0200] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Fig.17 and Fig.18 .

[0201] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 600 changes.

[0202] When the object is infinitely far from the optical system 600, the optical system 600 is in the first state. The structure diagram of the optical system 600 can be referred to Fig.17 , where W1=-7.4737mm, W2=-1.8124mm, effective focal length EFL of optical system 600=27.74mm, aperture value Fnox of optical system 600 in the first direction=2.9764, aperture value Fnoy of optical system 600 in the second direction=4.2546, maximum field of view FOV of optical system 600=12.2987°. When the object is at a predetermined distance from the optical system 600, the optical system 600 is in the second state. The structure diagram of the optical system 600 can be referred to Fig.18 .

[0203] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 12 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0204] Table 12

[0205]

[0206] Fig.19A The axial chromatic aberration curve of the first state of the optical system 600 of Example 6 is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the optical system 600. Fig.19B The astigmatism curve of the first state of the optical system 600 of Example 6 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig.19C The distortion curve of the first state of the optical system 600 of Example 6 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.19A , Fig.19B and Fig.19C It can be seen that the optical system 600 of Example 6 can achieve good imaging quality in the first state. Example 7

[0207] The following reference Fig. 20 , Fig.21 , Fig.22A , Fig. 22B and Fig. 22C The optical system of Example 7 is described.

[0208] like Fig. 20 and Fig.21 As shown, the optical system 700 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 700 may be 18 cm to infinity. The magnification of the optical system 700 may be 5X.

[0209] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0210] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 700 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 700 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 700. During the focusing process of the optical system 700, the maximum movement stroke of the second element group G2 can be 6.3982 mm.

[0211] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is convex. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is concave. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 may have negative power, and its object side surface S14 is convex, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0212] Table 13 shows a basic parameter table of the optical system 700 of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0213] Table 13

[0214]

[0215] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Fig. 20 and Fig.21 .

[0216] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 700 changes.

[0217] When the object is infinitely far from the optical system 700, the optical system 700 is in the first state. The structure diagram of the optical system 700 can be referred to Fig. 20, where W1=-9.3856mm, W2=-0.4627mm, effective focal length EFL of optical system 700=31.6999mm, aperture value Fnox of optical system 700 in the first direction=1.8982, aperture value Fnoy of optical system 700 in the second direction=1.8982, maximum field of view FOV of optical system 700=20.2102°. When the object is at a predetermined distance from the optical system 700, the optical system 700 is in the second state. The structural diagram of the optical system 700 can be referred to Fig.21 .

[0218] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 14 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0219] Table 14

[0220]

[0221] Fig.22A The axial chromatic aberration curve of the first state of the optical system 700 of Example 7 is shown, which indicates the deviation of the convergence point of light of different wavelengths after passing through the optical system 700. Fig. 22B The astigmatism curve of the first state of the optical system 700 of Example 7 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig. 22C FIG. 1 shows a distortion curve of the first state of the optical system 700 of Example 7, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.22A , Fig. 22B and Fig. 22C It can be seen that the optical system 700 of Example 7 can achieve good imaging quality in the first state. Example 8

[0222] The following reference Fig.23 , Fig.24 , Fig.25A , Fig.25B and Fig.25C The optical system of Example 8 is described.

[0223] like Fig.23 and Fig.24As shown, the optical system 800 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 800 may be 18 cm to infinity. The magnification of the optical system 800 may be 5X.

[0224] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0225] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 800 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 800 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 800. During the focusing process of the optical system 800, the maximum movement stroke of the second element group G2 can be 6.6394 mm.

[0226] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is convex. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is convex. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The seventh lens E7 may have negative power, and its object side surface S14 is concave, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0227] Table 15 shows a basic parameter table of the optical system 800 of Example 8, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0228] Table 15

[0229]

[0230] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Fig.23 and Fig.24 .

[0231] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 800 changes.

[0232] When the object is infinitely far from the optical system 800, the optical system 800 is in the first state. The structure diagram of the optical system 800 can be referred to Fig.23 , where W1=-8.7190mm, W2=-0.2139mm, effective focal length EFL of optical system 800=31.7401mm, aperture value Fnox of optical system 800 in the first direction=2.6, aperture value Fnoy of optical system 800 in the second direction=2.6, maximum field of view FOV of optical system 800=20.2178°. When the object is at a predetermined distance from the optical system 800, the optical system 800 is in the second state. The structural diagram of the optical system 800 can be referred to Fig.24 .

[0233] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 16 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0234] Table 16

[0235]

[0236] Fig.25A The axial chromatic aberration curve of the first state of the optical system 800 of Example 8 is shown, which indicates the deviation of the convergence point of light rays of different wavelengths after passing through the optical system 800. Fig.25BThe astigmatism curve of the first state of the optical system 800 of Example 8 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig.25C The distortion curve of the first state of the optical system 800 of Example 8 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.25A , Fig.25B and Fig.25C It can be seen that the optical system 800 of Example 8 can achieve good imaging quality in the first state. Example 9

[0237] The following reference Fig.26 , Fig. 27 , Fig.28A , Fig.28B and Fig.28C The optical system of Example 9 is described.

[0238] like Fig.26 and Fig. 27 As shown, the optical system 900 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 900 may be 18 cm to infinity. The magnification of the optical system 900 may be 5X.

[0239] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0240] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 900 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 900 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 900. During the focusing process of the optical system 900, the maximum movement stroke of the second element group G2 can be 6.7480 mm.

[0241] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is convex. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is convex. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 may have negative power, and its object side surface S14 is convex, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0242] Table 17 shows a basic parameter table of the optical system 900 of Example 9, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0243] Table 17

[0244]

[0245] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Fig.26 and Fig. 27 .

[0246] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 900 changes.

[0247] When the object is infinitely far from the optical system 900, the optical system 900 is in the first state. The structure diagram of the optical system 900 can be referred to Fig.26, where W1=-8.2483mm, W2=-0.2217mm, effective focal length EFL of optical system 900=31.7401mm, aperture value Fnox of optical system 900 in the first direction=3.3063, aperture value Fnoy of optical system 900 in the second direction=3.3063, maximum field of view FOV of optical system 900=20.2178°. When the object is at a predetermined distance from the optical system 900, the optical system 900 is in the second state. The structural diagram of the optical system 900 can be referred to Fig. 27 .

[0248] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 18 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0249] Table 18

[0250]

[0251] Fig.28A The axial chromatic aberration curve of the first state of the optical system 900 of Example 9 is shown, which indicates the deviation of the convergence point of light rays of different wavelengths after passing through the optical system 900. Fig.28B The astigmatism curve of the first state of the optical system 900 of Example 9 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig.28C The distortion curve of the first state of the optical system 900 of Example 9 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.28A , Fig.28B and Fig.28C It can be seen that the optical system 900 of Example 9 can achieve good imaging quality in the first state. Example 10

[0252] The following reference Fig.29 , Fig.30 , Fig.31A , Fig.31B and Fig. 31C The optical system of Embodiment 10 is described.

[0253] like Fig.29 and Fig.30As shown, the optical system 1000 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 1000 may be 15.0920 cm to infinity. The magnification of the optical system 1000 may be 8X.

[0254] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0255] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 1000 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 1000 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 1000. During the focusing process of the optical system 1000, the maximum movement stroke of the second element group G2 can be 5.6995 mm.

[0256] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is convex. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is convex. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The seventh lens E7 may have negative power, and its object side surface S14 is convex, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0257] Table 19 shows a basic parameter table of the optical system 1000 of Example 10, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0258] Table 19

[0259]

[0260] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Fig.29 and Fig.30 .

[0261] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 1000 changes.

[0262] When the object is infinitely far from the optical system 1000, the optical system 1000 is in the first state. The structure diagram of the optical system 1000 can be referred to Fig.29 , where W1=-7.4717mm, W2=-1.8133mm, effective focal length EFL of optical system 1000=27.74mm, aperture value Fnox of optical system 1000 in the first direction=1.9, aperture value Fnoy of optical system 1000 in the second direction=1.9, maximum field angle FOV of optical system 1000=12.2982°. When the object is at a predetermined distance from optical system 1000, optical system 1000 is in the second state, and the structure diagram of optical system 1000 can be referred to Fig.30 .

[0263] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 20 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0264] Table 20

[0265]

[0266] Fig.31AThe axial chromatic aberration curve of the first state of the optical system 1000 of Example 10 is shown, which indicates the deviation of the convergence point of light rays of different wavelengths after passing through the optical system 1000. Fig.31B The astigmatism curve of the first state of the optical system 1000 of Example 10 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature corresponding to different image heights. Fig. 31C The distortion curve of the first state of the optical system 1000 of Example 10 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.31A , Fig.31B and Fig. 31C It can be seen that the optical system 1000 of Example 10 can achieve good imaging quality in the first state. Embodiment 11

[0267] The following reference Fig.32 , Fig.33 , Fig.34A , Fig.34B and Fig.34C The optical system of Example 11 is described.

[0268] like Fig.32 and Fig.33 As shown, the optical system 1100 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 1100 may be 15.0920 cm to infinity. The magnification of the optical system 1100 may be 8X.

[0269] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0270] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 1100 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 1100 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 1100. During the focusing process of the optical system 1100, the maximum movement stroke of the second element group G2 can be 5.7738 mm.

[0271] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is convex. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is convex. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The seventh lens E7 may have negative power, and its object side surface S14 is convex, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0272] Table 21 shows a basic parameter table of the optical system 1100 of Example 11, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0273] Table 21

[0274]

[0275] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Fig.32 and Fig.33 .

[0276] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 1100 changes.

[0277] When the object is infinitely far from the optical system 1100, the optical system 1100 is in the first state. The structure diagram of the optical system 1100 can be referred to Fig.32 , where W1=-7.7487mm, W2=-1.8034mm, effective focal length EFL of optical system 1100=27.72mm, aperture value Fnox of optical system 1100 in the first direction=2.5979, aperture value Fnoy of optical system 1100 in the second direction=2.5979, maximum field of view FOV of optical system 1100=12.2982°. When the object is at a predetermined distance from optical system 1100, optical system 1100 is in the second state, and the structure diagram of optical system 1100 can be referred to Fig.33 .

[0278] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 22 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0279] Table 22

[0280]

[0281] Fig.34A The axial chromatic aberration curve of the first state of the optical system 1100 of Example 11 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical system 1100. Fig.34B The astigmatism curve of the first state of the optical system 1100 of Example 11 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig.34C The distortion curve of the first state of the optical system 1100 of Example 11 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.34A , Fig.34B and Fig.34C It can be seen that the optical system 1100 of Example 11 can achieve good imaging quality in the first state. Example 12

[0282] The following reference Fig.35 , Fig.36 , Fig.37A , Fig.37B and Fig.37C The optical system of Example 12 is described.

[0283] like Fig.35 and Fig.36 As shown, the optical system 1200 may include a first element group G1 and a second element group G2 arranged in sequence from the object side to the image side. The image side may be provided with an image plane IMA, for example. The imageable object distance range of the optical system 1200 may be 15.0920 cm to infinity. The magnification of the optical system 1200 may be 8X.

[0284] The first element group G1 may include a first lens E1, a reflective element P, and a second lens E2. The second element group G2 may include an aperture STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Specifically, the first lens E1 is located on the optical axis I and is arranged between the object side and the reflective element P. The second lens E2, the aperture STO, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in sequence from the reflective element P to the image side along the optical axis II. In one example, a filter E8 may be provided between the seventh lens E7 and the image plane IMA.

[0285] The first element group G1 is fixed in position relative to the image plane IMA on the optical axis II. The second element group G2 can move relative to the first element group G1 along the optical axis II. When the distance between the object and the optical system 1200 changes from far to near, the distance between the second element group G2 and the first element group G1 on the optical axis II is adjusted, so that the optical system 1200 can switch between the first state and the second state, thereby realizing the focusing function of the optical system 1200. During the focusing process of the optical system 1200, the maximum movement stroke of the second element group G2 can be 5.8577 mm.

[0286] The first lens E1 may have positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have negative power, and its object side surface S4 is concave, and its image side surface S5 is concave. The third lens E3 may have positive power, and its object side surface S6 is convex, and its image side surface S7 is convex. The fourth lens E4 may have negative power, and its object side surface S8 is concave, and its image side surface S9 is concave. The fifth lens E5 may have positive power, and its object side surface S10 is convex, and its image side surface S11 is concave. The sixth lens E6 may have positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The seventh lens E7 may have negative power, and its object side surface S14 is convex, and its image side surface S15 is concave. The filter E8 may have an object side surface S16 and an image side surface S17. Light from the object passes through the surfaces S1 to S17 in sequence and is finally imaged on the image plane S18.

[0287] Table 23 shows a basic parameter table of the optical system 1200 of Example 12, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0288] Table 23

[0289]

[0290] In this embodiment, the positive and negative values ​​of the numerical signs of the radius of curvature of each surface only indicate the curvature direction of the surface. When the curvature directions of the surfaces of the lenses on the optical axis I and the optical axis II are the same, the positive and negative values ​​of the numerical signs of the radius of curvature of the surfaces are opposite. Similarly, the positive and negative values ​​of the numerical signs of the thickness / distance of each surface only indicate the direction. The curvature direction of each surface and the thickness / distance of each surface can be referred to Fig.35 and Fig.36 .

[0291] The on-axis distance W1 from the first element group G1 to the second element group G2 and the on-axis distance W2 from the second element group G2 to the filter E8 are variables, which may change as the distance between the object and the optical system 1200 changes.

[0292] When the object is infinitely far from the optical system 1200, the optical system 1200 is in the first state. The structure diagram of the optical system 1200 can be referred to Fig.35 , where W1=-8.0062mm, W2=-1.7798mm, effective focal length EFL of optical system 1200=27.72mm, aperture value Fnox of optical system 1200 in the first direction=3.3, aperture value Fnoy of optical system 1200 in the second direction=3.3, maximum field angle FOV of optical system 1200=12.2982°. When the object is at a predetermined distance from optical system 1200, optical system 1200 is in the second state, and the structure diagram of optical system 1200 can be referred to Fig.36 .

[0293] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 24 shows the cone coefficient K and the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0294] Table 24

[0295]

[0296] Fig.37A The axial chromatic aberration curve of the first state of the optical system 1200 of Example 12 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical system 1200. Fig.37B The astigmatism curve of the first state of the optical system 1200 of Example 12 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig.37C The distortion curve of the first state of the optical system 1200 of Example 12 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.37A , Fig.37B and Fig.37C It can be seen that the optical system 1200 of Example 12 can achieve good imaging quality in the first state.

[0297] Table 25-1 and Table 25-2 respectively show the values ​​of parameters such as f1, f2, f3, f4, f5, f6, f7, SL, SH, and GH in each embodiment of Embodiments 1 to 12. Among them, SL, SH, and GH can be calculated according to Figure 1 The measurement is carried out using the marking method shown.

[0298] Table 25-1

[0299]

[0300] Table 25-2

[0301]

[0302] Table 26-1 and Table 26-2 respectively show the values ​​of the conditional expressions of each embodiment in Embodiments 1 to 12. It should be noted that the values ​​of the conditional expressions involving FOV, EFL, EPDx and EPDy in Table 26-1 and Table 26-2 are all calculated by the FOV, EFL, EPDx and EPDy of the optical system in the first state.

[0303] Table 26-1

[0304]

[0305] Table 26-2

[0306]

[0307] The present application also provides a camera module, which may be, for example, a periscope camera module. The camera module may include the above-mentioned optical system and an imaging element for converting an optical image formed by the optical system into an electrical signal.

[0308] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical system, characterized in that Along the optical axis from the object side to the image side, they include: a first element group, consisting of a first lens with positive optical power, a reflective element, and a second lens with negative optical power; the reflective element is used to reflect the light emitted from the first lens; and a second element group, consisting of a third lens having positive power, a fourth lens having negative power, a fifth lens having positive power, a sixth lens having positive power, and a seventh lens having negative power; Wherein, the optical system satisfies: -0.6 <f1 / f2<-0.3, Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

2. The optical system according to claim 1, wherein: The optical system also satisfies: Tan(FOV / 2)<0.38, Wherein, FOV is the maximum field of view of the optical system.

3. The optical system according to claim 1, wherein: The optical system also satisfies: 3.0 <D1 / CT1<6.0, Wherein, D1 is the maximum effective semi-aperture of the first lens, and CT1 is the center thickness of the first lens on the optical axis.

4. The optical system according to claim 1, wherein: The optical system also satisfies: 3.0 <FG1 / EFL<5.0, Among them, FG1 is the effective focal length of the first element group, and EFL is the effective focal length of the optical system.

5. The optical system according to claim 1, wherein: The optical system also satisfies: 2.5 <FG1 / FG2<4.5, Wherein, FG1 is the effective focal length of the first element group, and FG2 is the effective focal length of the second element group.

6. The optical system according to claim 1, wherein: The optical system also satisfies: 7.5mm <EFL / (FG1 / FG2)<11.5mm, Among them, FG1 is the effective focal length of the first element group, FG2 is the effective focal length of the second element group, and EFL is the effective focal length of the optical system.

7. The optical system according to claim 1, wherein: The optical system also satisfies: 0.04mm -1 <D2x / EPDx / d12<0.12mm -1 , Wherein, D2x is the maximum effective semi-aperture of the second lens in the first direction, EPDx is the entrance pupil diameter of the optical system in the first direction, and d12 is the axial distance from the image side surface of the first lens to the object side surface of the second lens.

8. The optical system according to claim 1, wherein: The optical system also satisfies: 0.04mm -1 <D2y / EPDy / d12<0.12mm -1 , Wherein, D2y is the maximum effective semi-aperture of the second lens in the second direction, EPDy is the entrance pupil diameter of the optical system in the second direction, and d12 is the axial distance from the image side surface of the first lens to the object side surface of the second lens.

9. The optical system according to claim 1, wherein: The optical system also satisfies: -0.15 <fs1 / fs2<0.8, Wherein, fs1 is the effective focal length of the object side of the first lens, and fs2 is the effective focal length of the image side of the first lens.

10. The optical system according to claim 1, wherein: The optical system also satisfies: 0.5 <EFL / SL<0.7, Wherein, EFL is the effective focal length of the optical system, and SL is the total length of the optical system along the direction of the preset main optical axis.

11. The optical system according to claim 1, wherein: The optical system also satisfies: OBJmin≥15.0cm, Wherein, OBJmin is the minimum value of the object distance of the optical system.

12. An optical system according to any one of claims 1 to 11, wherein: The optical axis includes a first optical axis and a second optical axis at a preset angle; The reflective element comprises a plane reflector, which receives the light emitted from the first lens along the direction of the first optical axis and reflects the light to emit to the second lens along the direction of the second optical axis.

13. An optical system according to any one of claims 1 to 11, wherein: The position of the first element group relative to the image plane arranged on the image side is fixed, and the distance between the second element group and the first element group on the optical axis is adjustable.

14. A camera module, characterized in that: The optical system comprises the optical system as claimed in any one of claims 1 to 13 and an imaging element for converting an optical image formed by the optical system into an electrical signal.

Images