Optical system and camera module

Abstract

The present application discloses an optical system and a camera module, wherein the optical system includes, in order from the object side to the image side: a first lens, a reflective element, and a second element group. The first lens has positive optical power and propagates light along the first optical axis. The reflective element changes the light emitted from the first lens from propagating along the first optical axis to propagating along the second optical axis. The first lens and the reflective element constitute a first element group. A second element group having positive optical power. During the anti-shake process, the position of the image plane of the optical system remains fixed, and the first element group rotates around a direction parallel to the second optical axis; wherein the effective focal length f1 of the first lens and the effective focal length EFL of the optical system satisfy: 1.9<|f1 / EFL|<3.0.

Description

Technical Field

[0001] The present application relates to the field of optical devices, and in particular to an optical system and a camera module. Background Art

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

[0004] One aspect of the present application provides an optical system, which includes, in order from the object side to the image side along the optical axis: a first lens, a reflective element, and a second element group. The first lens has positive optical power and propagates light along the first optical axis. The reflective element changes the light emitted from the first lens from propagating along the first optical axis to propagating along the second optical axis. The first lens and the reflective element constitute a first element group. A second element group with positive optical power. During the anti-shake process, the position of the image plane of the optical system remains fixed, and the first element group rotates around a direction parallel to the second optical axis, wherein the effective focal length f1 of the first lens and the effective focal length EFL of the optical system satisfy: 1.9<|f1 / EFL|<3.0.

[0005] In an exemplary embodiment, the maximum field of view FOV of the optical system satisfies: 0.1 <tan(FOV / 2)<0.23。

[0006] In an exemplary embodiment, the maximum effective semi-aperture D1 of the first lens and the center thickness CT1 of the first lens on the first optical axis satisfy: 4.0 <D1 / CT1<4.7。

[0007] In an exemplary embodiment, the second element group includes a movable lens group having an effective focal length FG2 of the movable lens group. m The effective focal length EFL of the optical system satisfies: 0.7<|FG2 m / EFL|<1.3.

[0008] In an exemplary embodiment, the second element group includes a movable lens group, and the effective focal length f1 of the first lens is equal to the effective focal length FG2 of the movable lens group.m Satisfies: 2.2<|f1 / FG2 m |<2.6.

[0009] In an exemplary embodiment, the effective focal length f1 of the first lens and the effective focal length FG2 of the second lens element group satisfy: 0.9<|f1 / FG2|<2.5.

[0010] In an exemplary embodiment, the effective focal length EFL of the optical system and the total length SL of the optical system on the second optical axis satisfy: 0.6 <EFL / SL<0.9。

[0011] In an exemplary embodiment, the total length of the optical system on the second optical axis and the entrance pupil diameter EPD of the optical system satisfy: 3.2 <SL / EPD<3.5。

[0012] In an exemplary embodiment, the shoulder height GH of the optical system and the entrance pupil diameter EPD of the optical system satisfy: 0.7 <GH / EPD<0.9。

[0013] In an exemplary embodiment, the total height SH of the optical system and the entrance pupil diameter EPD of the optical system satisfy: 1.0 <SH / EPD<1.15。

[0014] In an exemplary embodiment, half of the diagonal length of the effective pixel area on the image plane ImgH and the effective focal length EFL of the optical system satisfy: 0.1 <ImgH / EFL<0.3。

[0015] In an exemplary embodiment, the second element group includes a second lens closest to the reflective element, and the angle α between the edge light of the central field of view after passing through the first lens and the first optical axis, and the angle β between the edge light of the central field of view after passing through the second lens and the second optical axis satisfy: 1.5 <tanβ / tanα<1.8。

[0016] In an exemplary embodiment, the curvature radius L1S1R of the object side surface of the first lens satisfies the effective focal length EFL of the optical system: 1.4 <L1S1R / EFL<1.6。

[0017] In an exemplary embodiment, the second element group includes a second lens closest to the reflective element, and the curvature radius L2S2R of the image side surface of the second lens satisfies the effective focal length EFL of the optical system: 0.8 <L2S2R / EFL<2.4。

[0018] In an exemplary embodiment, the second element group has positive optical power, and during focusing, the second element group moves along the second optical axis.

[0019] In an exemplary embodiment, the second element group includes, in order from the reflective element to the image side: a second lens with positive power, a third lens with negative power, a fourth lens with positive power, a fifth lens with positive power, and a sixth lens with negative power.

[0020] In an exemplary embodiment, the second element group includes, from the reflective element to the image side, a first lens group with positive optical power and a second lens group with negative optical power. During focusing, the position of the first lens group remains fixed, and the second lens group moves along the second optical axis.

[0021] In an exemplary embodiment, the first lens group includes, from the reflective element to the second lens group, a second lens having positive power, a third lens having negative power, and a fourth lens having positive power. The second lens group includes, from the first lens group to the image side, a fifth lens having negative power, a sixth lens having positive power, and a seventh lens having negative power.

[0022] In an exemplary embodiment, the image plane is perpendicular to the second optical axis.

[0023] 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

[0024] 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:

[0025] Figure 1 A schematic structural diagram of an optical system according to an exemplary embodiment of the present application is shown;

[0026] Figure 2 A schematic diagram of the anti-shake principle of an optical system according to an exemplary embodiment of the present application is shown;

[0027] Figure 3 A schematic structural diagram of an optical system according to another exemplary embodiment of the present application is shown;

[0028] Figure 4 A schematic structural diagram of an optical system including a lens barrel assembly according to another exemplary embodiment of the present application is shown;

[0029] Figure 5 A schematic structural diagram of an optical system according to another exemplary embodiment of the present application is shown;

[0030] Figure 6 A schematic structural diagram of an optical system including a lens barrel assembly according to another exemplary embodiment of the present application is shown;

[0031] Figure 7 A schematic diagram of optical paths of a first lens and a second lens of an optical system according to an exemplary embodiment of the present application is shown;

[0032] Figure 8 A schematic structural diagram of an optical system according to Embodiment 1 of the present application is shown;

[0033] Fig. 9 , Fig.10 as well as Fig.11 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 1 of the present application are respectively shown;

[0034] Fig.12 A schematic structural diagram of an optical system according to Embodiment 2 of the present application is shown;

[0035] Fig.13 , Fig.14 as well as Fig.15 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 2 of the present application are respectively shown;

[0036] Fig.16 A schematic structural diagram of an optical system according to Embodiment 3 of the present application is shown;

[0037] Fig.17 , Fig.18 as well as Fig.19 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 3 of the present application are respectively shown;

[0038] Fig. 20 A schematic structural diagram of an optical system according to Embodiment 4 of the present application is shown;

[0039] Fig.21 , Fig. 22 and Fig.23 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical system of Example 4 of the present application are respectively shown;

[0040] Fig.24 shows a schematic structural diagram of an optical system according to Embodiment 5 of the present application; and

[0041] Fig.25 , Fig.26 as well as Fig. 27 The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical system of Example 5 of the present application are respectively shown.

[0042] Illustration Description:

[0043] 100, optical system; E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; E5, fifth lens; E6, sixth lens; E7, seventh lens; EF, filter; P, reflective element; STO, aperture; G1, first element group; G2, second element group; G21, first lens group; G22, second lens group; IMA, image plane; 200, lens barrel assembly; 210, first lens barrel; 220, second lens barrel; 230, third lens barrel. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0051] A periscope camera module is a camera module that can achieve long-distance shooting. For the optical system in the periscope camera module, the optical system can be provided with a reflective element, 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 achieving miniaturization of the periscope camera module.

[0052] In order to avoid or reduce the jitter phenomenon that occurs during the capture of optical signals. Periscope camera modules usually have optical image stabilization function. At present, one solution is to achieve image stabilization through the movement of the photosensitive element. This solution involves complex motor drive mechanisms and circuit designs, which leads to high costs. Another solution is to achieve image stabilization through the movement of the reflective element. The drive mechanism design of this solution is relatively simple and low in cost. However, achieving image stabilization through the movement of the reflective element may lead to a decrease in image quality, thereby affecting the clarity of the final image. Therefore, how to reduce the cost of camera modules with optical image stabilization function while ensuring image quality has become one of the key research directions for various manufacturers.

[0053] In order to at least partially solve the above problems or one or more of other potential problems, the present application provides an optical system. Specifically, an optical system with low-cost optical image stabilization function and good imaging quality is provided.

[0054] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0055] Figure 1 A schematic structural diagram of an optical system according to an exemplary embodiment of the present application is shown. Figure 2 The schematic diagram of the anti-shake principle of the optical system according to the exemplary embodiment of 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 types of camera modules, and the present application does not make specific restrictions on this.

[0056] like Figure 1As shown, the optical system 100 may include a first lens E1, a reflective element P, and a second element group G2 in sequence from the object side to the image side along the optical axis. Among them, the first lens E1 and the reflective element P constitute the first element group G1. The first lens E1 may have positive optical power and propagate light along the first optical axis (hereinafter referred to as optical axis I). The reflective element P changes the light emitted from the first lens E1 from propagating along the optical axis I to propagating along the second optical axis (hereinafter referred to as optical axis II). The second element group G2 includes at least five lenses in sequence from the reflective element P to the image side along the optical axis II. Exemplarily, the image side of the optical system 100 may be provided with an image plane IMA. For example, the image plane IMA may be perpendicular to the optical axis II.

[0057] It should be noted that the reflective element P can be arranged at any desired angle to change the propagation direction of the light. For example, the reflective element P can be arranged to deflect the incident light by a preset degree (for example, but not limited to 90°). Thus, the optical axis I and the optical axis II in this document can be at the preset angle (for example, but not limited to 90°). In this document, the optical system 100 is described by taking the optical axis I being perpendicular to the optical axis II as an example.

[0058] like Figure 1 As shown, the direction parallel to the optical axis I may be the y direction, the direction parallel to the optical axis II may be the z direction, and the direction perpendicular to both the y direction and the z direction may be the x direction. The optical system 100 may be in a rectangular coordinate system constructed by the x direction, the y direction, and the z direction. In this way, the image plane IMA may be located in a plane defined by the x direction and the y direction. During the anti-shake process, the position of the image plane IMA remains fixed, and the first element group G1 (i.e., the first lens E1 and the reflective element P) rotates around the z direction. Specifically, Figure 2 The image plane IMA and the reflective element P observed from the z direction are shown. The solid rectangle represents the position of the reflective element P in the non-stabilization state, and the solid straight line represents the image height 1 in the non-stabilization state. The dashed rectangle represents the position of the reflective element P in the anti-stabilization state, and the dashed straight line represents the image height 2 in the anti-stabilization state. During the anti-stabilization process, since the image plane IMA is located in the plane defined by the x-direction and the y-direction, the first element group G1 rotates around the z-direction, and the image height 1 in the non-stabilization state and the image height 2 in the anti-stabilization state only have an angular rotation, but no height position offset, so it will not cause imaging information loss, and will not affect the MTF axis value and the imaging effect and quality.

[0059] If the first element group G1 is rotated around the y-axis to achieve anti-shake, since the image plane IMA is located in the plane defined by the x-direction and the y-direction, a height position offset will occur. For example, in the edge field of view, the imaging information projected onto the image plane IMA by the rotated first element group G1 will be partially lost, thereby affecting the imaging effect and quality, and causing the MTF axis value to drop significantly.

[0060] Therefore, the optical system 100 provided in the present application realizes anti-shake by moving the first element group G1 including the reflective element P around the z direction, which can reduce the design complexity of the driving mechanism of the first element group G1, help reduce costs, and ensure that imaging information is not lost, thereby improving imaging quality.

[0061] In addition, in the optical system 100, the reflective element P is provided to effectively shorten the total length of the optical system 100, meeting the requirement of miniaturization. The first lens E1 with positive optical power converges the light, so that the light is still in a converged state after being reflected by the reflective element P, increasing the number of light entering the second element group G2, thereby increasing the effective aperture of the optical system 100, further improving the imaging quality of the optical system 100, and also reducing the optical effective aperture of the lens in the second element group G2, reducing the shoulder height of the second element group G2, thereby reducing the total height of the optical system 100.

[0062] By rationally allocating the optical power of the first lens E1 and the number of lenses in the second element group G2, and rotating the first element group G1 around a direction parallel to the optical axis II (i.e., the z direction), the optical system 100 has the characteristics of low anti-shake cost, miniaturization, large aperture, and good imaging quality.

[0063] In an exemplary embodiment, the optical system 100 may further include an aperture STO. The aperture STO may be, for example, disposed between the reflective element P and the second element group G2. As an example, the aperture STO is located on the optical axis II. In other words, the aperture STO is located in a plane defined by the x-direction and the y-direction. During the anti-shake process, since the aperture STO is located in a plane defined by the x-direction and the y-direction, the first element group G1 rotates around the z-direction, and when the rotated first element group G1 is projected onto the image plane IMA, the light participating in the imaging will not be lost at the aperture STO. Compared with the anti-shake achieved by rotating the first element group G1 around the y-axis, when the rotated first element group G1 is projected onto the image plane IMA, the light participating in the imaging may be blocked by the aperture STO. For example, in the central field of view and the edge field of view (especially the edge field of view), the light participating in the imaging may be blocked at the aperture STO, thereby affecting the MTF axis value and the imaging quality. In an exemplary embodiment, the first lens E1 having a positive optical power may be used to converge the light. By making the first lens E1 have a convergence effect on the light, the light can be kept in a convergence state after being reflected by the reflective element P, thereby increasing the amount of light entering the second element group G2, and increasing the effective aperture (i.e., the amount of light entering) of the optical system 100 without changing the physical aperture of the aperture STO, for example. In other words, under the same light conditions, the optical system 100 can capture more light, thereby improving the brightness of the image formed by the optical system 100. For example, in a dark environment, the optical system 100 with a large aperture can capture more light, which is particularly important for improving the imaging quality of the optical system 100 and the camera module including the optical system 100 in a dark environment.

[0064] In an exemplary embodiment, the effective focal length f1 of the first lens E1 may satisfy 43.7 mm. <f1<85.9mm。

[0065] As an example, the object-side surface of the first lens E1 may be a convex surface in the paraxial region, and the image-side surface of the first lens E1 may be a convex surface in the paraxial region.

[0066] It should be noted that the object-side surface of the first lens E1 is a convex surface, which means that the surface is convex toward the object side, and the object-side surface of the first lens E1 is a concave surface, which means that the surface is concave toward the object side. The image-side surface of the first lens E1 is a convex surface, which means that the surface is convex toward the image side, and the image-side surface of the first lens E1 is a concave surface, which means that the surface is concave toward the image side.

[0067] In an exemplary embodiment, the reflective element P may be disposed between the first lens E1 and the second lens group G2. That is, the first lens E1 may be located on the optical axis I and disposed between the object side and the reflective element P, and the second lens group G2 may be located on the optical axis II and disposed between the reflective element P and the image side (eg, image plane IMA).

[0068] In an exemplary embodiment, 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 to the second element group G2 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 using a plane reflector of smaller weight and size as a reflective element, 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 100 can be reduced as much as possible, and the driving burden of the reflective element P can be reduced during the anti-shake process.

[0069] It should be understood that the plane reflector only has a reflective surface, and its position facing the light incident side and the light exiting side is empty. When the first lens E1 is set, the first lens E1 can be made closer to the plane reflector, thereby reducing the height space occupied by the first lens E1 and the reflective element P, thereby reducing the overall height of the optical system 100.

[0070] In an exemplary embodiment, there may be a spacing distance between the first lens E1 and the reflective element P. By providing a spacing between the first lens E1 and the reflective element P, multiple options can be provided for the surface design of the side surface of the first lens E1 close to the reflective element P, thereby improving the flexibility of the surface design of the side surface of the first lens E1 close to the reflective element P.

[0071] It should be understood that the spacing distance between the first lens E1 and the reflective element P means that there is a certain gap between the side surface of the first lens E1 close to the reflective element P and at least a portion of the reflective element P, rather than that the first lens E1 and the reflective element P are completely out of contact.

[0072] It should be understood that the number of lenses included in the first element group G1 is only an example, and the present application does not specifically limit the number of lenses included in the first element group G1. As an example, the first element group G1 may include a greater number of lenses (eg, greater than one).

[0073] In an exemplary embodiment, the first element group G1 may have a positive optical power. As an example, the effective focal length FG1 of the first element group G1 may satisfy: 43.7 mm <FG1<85.9mm。

[0074] In an exemplary embodiment, the effective focal length FG1 of the first element group G1 and the effective focal length EFL of the optical system 100 may satisfy: 1.9 <FG1 / EFL<3.0。

[0075] In an exemplary embodiment, the effective focal length FG2 of the second element group G2 may satisfy: 25.8 mm <FG2<48.6mm。

[0076] In an exemplary embodiment, the effective focal length FG2 of the second lens group G2 and the effective focal length EFL of the optical system 100 may satisfy: 1.2 < FG2 / EFL < 2.2.

[0077] In an exemplary embodiment, the effective focal length FG1 of the first lens group G1 and the effective focal length FG2 of the second lens group G2 may satisfy: 0.9 < FG1 / FG2 < 2.5. Specifically, FG1 and FG2 may satisfy: 0.9 < FG1 / FG2 < 2.4.

[0078] It should be understood that Figure 1 The number of lenses included in the illustrated second lens group G2 being four is only an example, and the present application does not specifically limit the number of lenses included in the second lens group G2 either. For example, the number of lenses included in the second lens group G2 is at least five. Specifically, the number of lenses included in the second lens group G2 may be five or six.

[0079] In addition, the number of lens groups included in the optical system 100 being two is only an example, and the present application does not specifically limit the number of lens groups included in the optical system 100 either. As an example, the optical system 100 may include a greater number (e.g., more than two) of lens groups. In an exemplary embodiment, the optical system 100 may further include a filter EF. The filter EF may be disposed on the image side of the second lens group G2. The filter EF may be used to filter the light rays emitted from the second lens group G2. The filter EF may be, for example, an infrared filter.

[0080] Figure 3 The structural schematic diagram of an optical system according to another exemplary embodiment of the present application is shown.

[0081] In an exemplary embodiment, as Figure 3 shown, the second lens group G2 may have a positive optical power. In other words, the combined focal length of the second lens E2 to the fifth lens E5 is greater than zero. Specifically, Figure 3 The effective focal length FG2 of the illustrated second lens group G2 may satisfy: 25.8 mm < FG2 < 36.0 mm.

[0082] In an exemplary embodiment, as Figure 3 shown, the second lens group G2 may include five lenses. These five lenses include, in order from the reflecting element P to the image side (e.g., the image plane IMA) along the optical axis II, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0083] In example embodiments, the second lens E2 may have positive power, the third lens E3 may have negative power, the fourth lens E4 may have positive power, the fifth lens E5 may have positive power, and the sixth lens E6 may have negative power.

[0084] As an example, the object-side surface of the second lens E2 may be a convex surface in the paraxial region, and the image-side surface may be a concave surface in the paraxial region.

[0085] As an example, the object-side surface of the third lens E3 may be a convex surface in the paraxial region, and the image-side surface may be a concave surface in the paraxial region.

[0086] As an example, the object-side surface of the fourth lens E4 may be a convex surface in the paraxial region, and the image-side surface may be a convex surface in the paraxial region.

[0087] As an example, the object-side surface of the fifth lens E5 may be a concave surface in the paraxial region, and the image-side surface may be a convex surface in the paraxial region.

[0088] As an example, the object-side surface of the sixth lens E6 may be a convex surface in the paraxial region, and the image-side surface may be a concave surface in the paraxial region.

[0089] It should be noted that the object side surface of any lens from the second lens E2 to the sixth lens E6 being a convex surface means that the surface is convex toward the object side, and the object side surface of any lens from the second lens E2 to the sixth lens E6 being a concave surface means that the surface is concave toward the object side. The image side surface of any lens from the second lens E2 to the sixth lens E6 being a convex surface means that the surface is convex toward the image side, and the image side surface of any lens from the second lens E2 to the sixth lens E6 being a concave surface means that the surface is concave toward the image side.

[0090] In an exemplary embodiment, the second element group G2 as a whole is used as a movable lens group. During the focusing process, the second element group G2 moves along the optical axis II, that is, the distance between the reflective element P and the second element group G2 (for example, the second lens E2) can be adjusted. When the distance between the subject and the optical system 100 (that is, the object distance) changes, the distance between the reflective element P and the second element group G2 (for example, the second lens E2) is adjusted to achieve the focusing function of the optical system 100. As an example, when the distance of the subject from the optical system 100 is from far to near, the second element group G2 can be moved along the optical axis II toward the reflective element P, that is, the distance between the second element group G2 and the reflective element P on the optical axis II is reduced. When the distance of the subject from the optical system 100 is from near to far, the second element group G2 can be moved along the optical axis II toward the image side (for example, the image plane IMA), that is, the distance between the second element group G2 and the reflective element P on the optical axis II is increased. The second element group G2 is used as a movable lens group to play a compensation role.

[0091] In an exemplary embodiment, during the focusing process, the spacing distances between the lenses in the second element group G2 remain fixed.

[0092] In an exemplary embodiment, the movable stroke LG2 of the second element group G2 may satisfy: 1.7 mm <LG2<2.4mm。

[0093] It should be understood that the number of lenses included in the second element group G2 being five is only an example, and the present application does not impose any specific limitation on the number of lenses included in the second element group G2.

[0094] In an exemplary embodiment, at least one surface of the first lens E1 to the sixth lens E6 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.

[0095] Figure 4 A schematic structural diagram of an optical system including a lens barrel assembly according to an exemplary embodiment of the present application is shown.

[0096] In an exemplary embodiment, if Figure 4 As shown, the optical system 100 may further include a lens barrel assembly 200. The lens barrel assembly 200 may include a first lens barrel 210 and a second lens barrel 220. The first element group G1 may be fixed in the first lens barrel 210. The second element group G2 may be fixed in the second lens barrel 220. The first lens barrel 210 may have a first opening located at a light incident side and a second opening located at a light exit side, the first lens E1 may be disposed in the first opening, and the reflective element P may be disposed between the first opening and the second opening. The inner diameters of the parts corresponding to different lenses in the second lens barrel 220 are different.

[0097] During the anti-shake process of the optical system 100 , the first lens barrel 210 can drive the first element group G1 disposed inside thereof to rotate around the z direction.

[0098] During the focusing process of the optical system 100, the second lens barrel 220 can drive the second element group G2 disposed therein to move along the optical axis II. As an example, when the distance of the object to be photographed from the optical system 100 is from far to near, the second lens barrel 220 can drive the second element group G2 disposed therein to move along the optical axis II toward the reflective element P. When the distance of the object to be photographed from the optical system 100 is from near to far, the second lens barrel 220 can drive the second element group G2 disposed therein to move along the optical axis II toward the image side (for example, the image plane IMA).

[0099] In an exemplary embodiment, during the anti-shake and / or focusing process of the optical system 100, the first lens barrel 210 and the first element group G1 disposed therein may be driven by a first motor (not shown), and the second lens barrel 220 and the second element group G2 disposed therein may be driven by a second motor (not shown). In addition, the position of the image plane IMA may remain fixed.

[0100] Figure 5 A schematic structural diagram of an optical system according to yet another exemplary embodiment of the present application is shown.

[0101] In an exemplary embodiment, Figure 5 As shown, the second element group G2 may have positive optical power. In other words, the combined focal length of the second lens E2 to the sixth lens E6 is greater than zero. Specifically, the effective focal length FG2 of the second element group G2 may satisfy: 47.2 mm <FG2<48.6mm。

[0102] In an exemplary embodiment, the second element group G2 may include a first lens group G21 and a second lens group G22 in order from the reflective element P to the image side (eg, image plane IMA). The first lens group G21 may serve as a fixed lens group, and the second lens group G22 may serve as a movable lens group.

[0103] In an exemplary embodiment, the first lens group G21 may have positive power. The effective focal length FG21 of the first lens group G21 may satisfy: 16.6 mm <FG21<16.6mm。

[0104] In an exemplary embodiment, the second lens group G22 may have negative power. The effective focal length FG22 of the second lens group G22 may satisfy: -17.6 mm <FG22<-17.4mm。

[0105] In an exemplary embodiment, the effective focal length FG21 of the first lens group G21 and the effective focal length FG22 of the second lens group G22 may satisfy: -0.96 <FG21 / FG22<-0.94。

[0106] In an exemplary embodiment, the effective focal length FG1 (eg, f1) of the first element group G1 (eg, the first lens E1) and the effective focal length FG21 of the first lens group G21 may satisfy: 2.6 <FG1 / FG21<2.8。

[0107] In example embodiments, an effective focal length FG1 (eg, f1) of the first element group G1 (eg, the first lens E1) and an effective focal length FG22 of the second lens group G22 may satisfy: 2.4<|FG1 / FG22|<2.6.

[0108] It should be understood that the number of lenses included in the first lens group G21 is three for example only, and the number of lenses included in the second lens group G22 is three for example only, and the present application does not impose any specific restrictions on the number of lenses included in the first lens group G21 and the second lens group G22 respectively. As an example, when the number of the second element group G2 is six, the number of lenses included in the first lens group G21 and the second lens group G22 respectively may be three and three, two and four, one and five, four and two, five and one. In addition, the number of lens groups included in the second element group G2 is two for example only, and the present application does not impose any specific restrictions on the number of lens groups included in the second element group G2. As an example, the second element group G2 may include a larger number (for example, greater than two) of lens groups.

[0109] In an exemplary embodiment, the first lens group G21 may include a second lens E2, a third lens E3, and a fourth lens E4 in order from the reflective element P to the image side (e.g., image plane IMA). The second lens group G22 includes a fifth lens E5, a sixth lens E6, and a seventh lens E7 in order from the first lens group G21 (e.g., fourth lens E4) to the image side (e.g., image plane IMA). In other words, in the second element group G2, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, and the seventh lens E7 are arranged in order from the reflective element P to the image side (e.g., image plane IMA). The second lens E2, the third lens E3, and the fourth lens E4 may constitute the first lens group G21, and the fifth lens E5, the sixth lens E6, and the seventh lens E7 may constitute the second lens group G22.

[0110] In an exemplary embodiment, in the first lens group G21, the second lens E2 has positive power, the third lens E3 has negative power, and the fourth lens E4 has positive power. In the second lens group G22, the fifth lens E5 may have negative power, the sixth lens E6 may have positive power, and the seventh lens E7 may have negative power.

[0111] As an example, the object-side surface of the second lens E2 may be a convex surface in the paraxial region, and the image-side surface may be a concave surface in the paraxial region.

[0112] As an example, the object-side surface of the third lens E3 may be a convex surface in the paraxial region, and the image-side surface may be a concave surface in the paraxial region.

[0113] As an example, the object-side surface of the fourth lens E4 may be a convex surface in the paraxial region, and the image-side surface may be a convex surface in the paraxial region.

[0114] As an example, the object-side surface of the fifth lens E5 may be a concave surface in the paraxial region, and the image-side surface may be a convex surface in the paraxial region.

[0115] As an example, the object-side surface of the sixth lens E6 may be a concave surface in the paraxial region, and the image-side surface may be a convex surface in the paraxial region.

[0116] As an example, the object-side surface of the seventh lens E7 may be a convex surface in the paraxial region, and the image-side surface may be a concave surface in the paraxial region.

[0117] It should be noted that if the object side surface of any lens from the second lens E2 to the seventh lens E7 is a convex surface, it means that the surface is convex toward the object side, and if the object side surface of any lens from the second lens E2 to the seventh lens E7 is a concave surface, it means that the surface is concave toward the object side. If the image side surface of any lens from the second lens E2 to the seventh lens E7 is a convex surface, it means that the surface is convex toward the image side, and if the image side surface of any lens from the second lens E2 to the seventh lens E7 is a concave surface, it means that the surface is concave toward the image side.

[0118] In an exemplary embodiment, as described above, the first lens group G21 may be used as a fixed lens group, and the second lens group G22 may be used as a movable lens group. During the focusing process, the position of the first lens group G21 remains fixed, and the second lens group G22 moves along the optical axis II. In other words, the distance between the first lens group G21 (e.g., the fourth lens E4) and the second lens group G22 (e.g., the fifth lens E5) is adjustable. When the distance (i.e., the object distance) between the subject and the optical system 100 changes, the distance between the first lens group G21 (e.g., the fourth lens E4) and the second lens group G22 (e.g., the fifth lens E5) is adjusted to achieve the focusing function of the optical system 100. As an example, when the distance between the subject and the optical system 100 changes from far to near, the second lens group G22 may move along the optical axis II toward the image side (e.g., the image plane IMA), that is, the distance between the second lens group G22 and the first lens group G21 on the optical axis II is increased. When the distance between the object and the optical system 100 increases from near to far, the second lens group G22 can move toward the first lens group G21 along the optical axis II, that is, the distance between the second lens group G22 and the first lens group G21 on the optical axis II is reduced. The second lens group G22 in the second element group G2 can be used as a movable lens group to play a compensation role, such as compensating aberrations, thereby improving the image quality.

[0119] In an exemplary embodiment, during the focusing process, the spacing distances between the lenses in the first lens group G21 remain fixed, and the spacing distances between the lenses in the second lens group G22 remain fixed.

[0120] In an exemplary embodiment, the movable stroke LG22 of the second lens group G22 may satisfy: 1.4 mm <LG22<1.6mm。

[0121] In an exemplary embodiment, at least one surface of the first lens E1 to the seventh lens E7 is an aspherical surface. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving imaging quality.

[0122] Figure 6 A schematic structural diagram of an optical system including a lens barrel assembly according to an exemplary embodiment of the present application is shown.

[0123] In an exemplary embodiment, if Figure 6 As shown, the optical system 100 may also include a lens barrel assembly 200. The lens barrel assembly 200 may include a first lens barrel 210, a second lens barrel 220, and a third lens barrel 230. The first element group G1 may be fixed in the first lens barrel 210. The first lens group G21 may be fixed in the second lens barrel 220. The second lens group G22 may be fixed in the third lens barrel 230. The first lens barrel 210 may have a first opening located at the light incident side and a second opening located at the light exit side, the first lens E1 may be arranged in the first opening, and the reflective element P may be arranged between the first opening and the second opening. The inner diameters of the parts corresponding to different lenses in the second lens barrel 220 are different. The inner diameters of the parts corresponding to different lenses in the third lens barrel 230 are different.

[0124] During the anti-shake process of the optical system 100 , the first lens barrel 210 can drive the first element group G1 disposed inside thereof to rotate around the z direction.

[0125] During the focusing process of the optical system 100, the third lens barrel 230 can drive the second lens group G22 disposed therein to move along the optical axis II. As an example, when the distance of the object to the optical system 100 is from far to near, the third lens barrel 230 can drive the second lens group G22 disposed therein to move toward the image side (e.g., image plane IMA) along the optical axis II. When the distance of the object to the optical system 100 is from near to far, the third lens barrel 230 can drive the second lens group G22 disposed therein to move toward the first lens group G21 along the optical axis II.

[0126] In an exemplary embodiment, during the anti-shake and / or focusing process of the optical system 100, the first lens barrel 210 and the first element group G1 disposed therein may be driven by a first motor (not shown), and the third lens barrel 230 and the second lens group G22 disposed therein may be driven by a third motor (not shown). In addition, the position of the image plane IMA may remain fixed.

[0127] In an exemplary embodiment, if Figure 1 , Figure 3 as well as Figure 5As shown, the optical system 100 can satisfy: 0.1 < tan(FOV / 2) < 0.23, where FOV is the maximum field of view angle of the optical system 100. Reasonably configuring the tangent value of half of the maximum field of view angle of the optical system 100 can enable the optical system 100 to have a smaller field of view angle, which is beneficial to balancing the imaging of the objects at long distances and short distances by the optical system 100, thereby ensuring that the optical system 100 has good imaging quality at both long distances and short distances.

[0128] In an exemplary embodiment, as Figure 1 , Figure 3 and Figure 5 shown, the optical system 100 can satisfy: 4.0 < D1 / CT1 < 4.7, where D1 is the maximum effective semi-aperture of the first lens E1, and CT1 is the central thickness on the optical axis I of the first lens E1. D1 can be, for example, the maximum value among the effective semi-apertures of the object side of the first lens E1 in the x direction, the effective semi-apertures of the object side of the first lens E1 in the z direction, the effective semi-apertures of the image side of the first lens E1 in the x direction, and the effective semi-apertures of the image side of the first lens E1 in the z direction. Reasonably configuring the ratio of the maximum effective semi-aperture D1 of the first lens E1 to the central thickness CT1 of the first lens E1 can make the optical system 100 have a compact structure, which is beneficial to shortening the total height of the optical system and is also beneficial to increasing the effective aperture of the optical system 100 while meeting the processability requirements of the first lens E1. In addition, restricting the central thickness of the first lens E1 within a reasonable range can reduce the optical path length, thereby reducing the aberration caused by light refraction. If the thickness of the lens is too large, it will increase the path of light passing through the lens, which may lead to more optical distortion and thus is not conducive to improving the imaging quality.

[0129] In an exemplary embodiment, as Figure 1 , Figure 3 and Figure 5As shown, the optical system 100 can satisfy: 1.9<|f1 / EFL|<3.0, where f1 is the effective focal length of the first lens E1, and EFL is the effective focal length of the optical system 100. Reasonable configuration of the ratio of the effective focal length of the first lens E1 to the effective focal length of the optical system 100 can enable the first lens E1 to have a convergence ability, thereby playing a convergence role on the light and helping to shorten the shoulder height. In addition, the first lens E1 that has the ability to converge light can also play a role in expanding the aperture. The above-mentioned constraints of the optical system 100 are less than the maximum value, which can effectively reduce the aperture value of the optical system 100, thereby playing a role in expanding the aperture; the above-mentioned constraints of the optical system 100 are greater than the minimum value, which can reduce the difficulty of processing the first lens E1. In other words, the optical system 100 satisfies the above-mentioned constraints and can take into account the smaller aperture value and the processability of the first lens E1. Because the aperture of the optical system in the conventional periscope camera module is smaller, jitter occurs during night scene or video shooting, making the imaging effect worse. When the optical system 100 satisfies: 1.9<|f1 / EFL|<3.0, during the anti-shake process, the position of the image plane of the optical system 100 remains fixed, and the first lens E1 and the reflective element P rotate together around a direction parallel to the second optical axis, which not only enables the first lens E1 to have a focusing ability, thereby focusing the light to help expand the aperture and shorten the shoulder height; it is also beneficial to correct the rotation and shaking of the camera module in low-light environments and during video shooting, thereby helping to improve the night scene shooting and video shooting performance of the device, thereby meeting a wider range of usage needs.

[0130] In an exemplary embodiment, if Figure 1 , Figure 3 as well as Figure 5 As shown, the second element group G2 includes a movable lens group, such as Figure 3 The second element group G2 or Figure 5 The second lens group G22 is shown. The optical system 100 may satisfy: 0.7<|FG2 m / EFL|<1.3, where FG2 m is the effective focal length of the movable lens group, and EFL is the effective focal length of the optical system 100. As an example, in the case where the second element group G2 is used as the movable lens group, the optical system 100 may satisfy: 1.2<|FG2 m / EFL|<1.3. As an example, in the case where the second lens group G22 in the second element group G2 is a movable lens group, the optical system 100 may satisfy: 0.7<|FG2 m / EFL|<0.8. When the optical system 100 photographs objects at different object distances, the ratio of the effective focal length of the movable lens group in the second element group G2 to the effective focal length of the optical system 100 can be reasonably configured to ensure that the focusing function is achieved by moving the movable lens group, and can also ensure that the optical system 100 has good imaging performance at different object distances, thereby helping to expand the imageable object distance range of the optical system 100. In addition, when Figure 5 When the optical system 100 shown satisfies the above constraints, the first lens group G21 in the second element group G2 can play a connecting role, allowing the light emitted from the first element group G1 to smoothly enter the second lens group G22 (i.e., the movable lens group), thereby correcting aberrations to improve imaging quality.

[0131] When the optical system 100 satisfies: 0.7<|FG2 m / EFL|<1.3, during the anti-shake process, the position of the image plane of the optical system 100 remains fixed, and the first lens E1 and the reflective element P rotate together around a direction parallel to the second optical axis, so that when shaking occurs, the optical system 100 can ensure that the focusing function is achieved by moving the movable lens group, and can also ensure that the optical system 100 has good imaging performance at different object distances, which is conducive to expanding the imageable object distance range of the optical system 100. Furthermore, aberrations can be corrected during the anti-shake process to ensure that high-quality images can be obtained even under shaking conditions.

[0132] In an exemplary embodiment, Figure 1 , Figure 3 as well as Figure 5 As shown, the second element group G2 includes a movable lens group, such as Figure 3 The second element group G2 or Figure 5 The second lens group G22 is shown. The optical system 100 may satisfy: 2.2<|f1 / FG2 m |<2.6, where f1 is the effective focal length of the first lens E1, FG2 m is the effective focal length of the movable lens group. As an example, when the second element group G2 is used as the movable lens group, the optical system 100 may satisfy: 2.2<|f1 / FG2 m |<2.4. As an example, in the case where the second lens group G22 in the second element group G2 is a movable lens group, the optical system 100 may satisfy: 2.4<|f1 / FG2 m|<2.6. Reasonable configuration of the ratio of the effective focal length of the first lens E1 to the effective focal length of the movable lens group in the second element group G2 can make the light emitted from the first element group G1 transition more smoothly in the movable lens group, which helps to improve the imaging quality of the optical system 100. In addition, it is also beneficial to control the aberrations generated by the first element group G1, so that the movable lens group has a stronger effect on aberration correction, so that the optical system 100 has better imaging quality. On the other hand, it is also beneficial to reduce the moving stroke of the movable lens, thereby reducing the volume of the motor used to drive the movable lens group. When the optical system 100 is applied to a camera module (including a motor), the camera module has a more compact structure. For example, if the ratio of the effective focal length of the first lens E1 to the effective focal length of the movable lens group in the second element group G2 is less than 2.2, the movable lens group may need to have a larger effective focal length, resulting in the movable lens group having a larger moving stroke (i.e., the driving stroke of the motor), which is not conducive to reducing the volume of the motor. If the ratio of the effective focal length of the first lens E1 to the effective focal length of the movable lens group in the second element group G2 is greater than 2.6, the light emitted from the first element group G1 may not be smoothly transferred to the movable lens group, which is not conducive to improving the imaging quality. In addition, when the ratio is greater than 2.6, the first lens E1 may need to have a larger effective focal length, which is not conducive to achieving the machinability of the first lens E1.

[0133] Therefore, the optical system 100 satisfies the above constraints and can simultaneously meet the design requirements of imaging quality, processability of the first lens, and movement stroke of the movable lens group.

[0134] When the optical system 100 satisfies: 2.2<|f1 / FG2 m |<2.6, during the anti-shake process, the position of the image plane of the optical system 100 remains fixed, and the first lens E1 and the reflective element P rotate together around a direction parallel to the second optical axis, so that when shaking occurs, the optical system 100 can make the light emitted from the first element group G1 transition more smoothly in the movable lens group, which helps to improve the imaging quality of the optical system 100. Furthermore, the aberration generated by the first element group G1 can be controlled during the anti-shake process, so that the movable lens group has a stronger effect on aberration correction, so that the optical system 100 can also obtain high-quality images under shaking conditions.

[0135] In an exemplary embodiment, Figure 1 , Figure 3 as well as Figure 5As shown, the optical system 100 can satisfy: 0.9 < |f1 / FG2| < 2.5, where f1 is the effective focal length of the first lens and FG2 is the effective focal length of the second element group. As an example, when the second element group G2 is a movable lens group, the optical system 100 can satisfy: 2.2 < |f1 / FG2| < 2.4. As an example, when the second lens group G22 in the second element group G2 is a movable lens group, the optical system 100 can satisfy: 0.9 < |f1 / FG2| < 1.0. Reasonably configuring the ratio of the effective focal length of the first lens E1 to the effective focal length of the second element group G2 can enable the first lens E1 to have a strong light converging ability and a strong aperture expanding effect. In addition, it can make the light emitted from the first element group G1 transition smoothly in the second lens group G22, which helps to improve the imaging quality of the optical system 100. In an exemplary embodiment, as Figure 1 Figure 3 and Figure 5 shown, the optical system 100 can satisfy: 0.6 < EFL / SL < 0.9, where EFL is the effective focal length of the optical system 100 and SL is the total length of the optical system 100 on the optical axis II. Reasonably configuring the ratio of the effective focal length of the optical system 100 to the total length of the optical system 100 can enable the optical system 100 to have a long focal length characteristic while shortening the total length of the optical system 100. In addition, when the optical system 100 satisfies the above constraints, it can also take into account the design requirements in multiple directions such as imaging quality, size, and cost.

[0136] When the optical system 100 satisfies: 0.9 < |f1 / FG2| < 2.5, during the anti-shake process, the position of the image plane of the optical system 100 remains fixed, and the first lens E1 and the reflective element P rotate together around a direction parallel to the second optical axis. In this way, the first lens E1 can have a strong light converging ability and a strong aperture expanding effect, and it is also beneficial to correct the rotation and jitter generated by the camera module in low light environments and video shooting. Furthermore, it is beneficial to improve the performance of the device in night scene shooting and video shooting, and thus meet more extensive usage requirements. When jitter occurs, the optical system 100 can make the light emitted from the first element group G1 transition smoothly in the second lens group G22, so that the optical system 100 can also obtain high-quality images under jitter conditions.

[0137] In an exemplary embodiment, as Figure 1 , Figure 3 and Figure 5As shown, the optical system 100 can satisfy: 3.2 < SL / EPD < 3.5. Among them, SL is the total length of the optical system 100 on the optical axis II, and EPD is the entrance pupil diameter of the optical system 100. Among them, the entrance pupil diameter affects the aperture size of the optical system 100. Reasonably configuring the ratio of the total length of the optical system 100 to its entrance pupil diameter can enable the optical system 100 to have a large aperture characteristic while shortening the total length of the optical system 100. The optical system 100 satisfying the above constraints can balance the aperture of the optical system 100 and the design size and weight. If the optical system 100 does not satisfy the above constraints, it may cause the optical system 100 to be too large or bulky, which is not conducive to the miniaturization of the optical system 100.

[0138] When the optical system 100 satisfies: 3.2 < SL / EPD < 3.5, during the anti-shake process, the position of the image plane of the optical system 100 remains fixed, and the first lens E1 and the reflecting element P rotate together around a direction parallel to the second optical axis. In this way, the optical system 100 can have a large aperture characteristic while shortening the total length of the optical system 100, and it is also beneficial to correct the rotation and jitter generated by the imaging module in low-light environments and video shooting, thereby being beneficial to improving the performance of the device's night scene shooting and video shooting, and thus meeting a wider range of usage requirements.

[0139] In an exemplary embodiment, as Figure 1 、 Figure 3 and Figure 5 shown, the optical system 100 can satisfy: 0.7 < GH / EPD < 0.9. Among them, GH is the shoulder height of the optical system 100, and EPD is the entrance pupil diameter of the optical system 100. Reasonably configuring the ratio of the shoulder height of the optical system 100 to its entrance pupil diameter can enable the optical system 100 to have a large aperture characteristic while shortening the shoulder height of the optical system 100. Specifically, the shoulder height needs to match the effective aperture (for example, the physical aperture of the diaphragm STO) to ensure that light can effectively propagate in the optical system 100 without causing occlusion or loss. The size and position of the effective aperture affect the propagation of light, and the design of the shoulder height needs to ensure that light can pass through, for example, the second element group G2 in an optimal manner. The optical system 100 satisfying the above constraints helps to reduce the aberration of the optical system 100. Especially for an optical system with a telephoto characteristic or a large aperture characteristic (for example, the optical system 100), it can more significantly improve the imaging quality. On the other hand, restricting the aperture within a reasonable range can reduce the contribution of marginal rays to aberration, thereby being able to compensate to a certain extent for the influence caused by the inclination of the reflecting element P.

[0140] When the optical system 100 satisfies: 0.7 < GH / EPD < 0.9, during the anti-shake process, the position of the image plane of the optical system 100 remains fixed, and the first lens E1 and the reflection element P rotate together around a direction parallel to the second optical axis. In this way, while enabling the optical system 100 to have a large aperture characteristic, it is also possible to shorten the shoulder height of the optical system 100, and it is also beneficial to correct the rotation and jitter generated by the camera module in low-light environments and during video shooting, thereby facilitating the improvement of the night scene shooting and video shooting performance of the device, and thus meeting a wider range of usage requirements.

[0141] In an exemplary embodiment, as Figure 1 , Figure 3 and Figure 5 shown, the optical system 100 may satisfy: 1.0 < SH / EPD < 1.15. Wherein, SH is the total height of the optical system 100, and EPD is the entrance pupil diameter of the optical system 100. By reasonably configuring the ratio of the total height of the optical system 100 to its entrance pupil diameter, while enabling the optical system 100 to have a large aperture characteristic, it is also possible to shorten the total height of the optical system 100. Specifically, the effective balance between the total height of the optical system 100 and its entrance pupil diameter can not only ensure that the optical system 100 has good optical performance, but also ensure that the optical system 100 is not too bulky or "top-heavy", which is beneficial to making the optical system 100 compact and improving space utilization. The minimum value of the optical system 100 that satisfies the above constraints can ensure that the total height has a sufficiently large design size, thereby ensuring the accommodation space for the effective aperture (for example, the aperture STO), and thus enabling light to propagate smoothly. On the other hand, the maximum value of the optical system 100 that satisfies the above constraints can ensure the compactness of the optical system 100. In summary, the optical system 100 satisfying the above constraints can take into account a smaller total height and a larger aperture.

[0142] In an exemplary embodiment, as Figure 1 , Figure 3 and Figure 5 shown, the optical system 100 may satisfy: 0.1 < ImgH / EFL < 0.3. Wherein, ImgH is half of the diagonal length of the effective pixel region on the image plane IMA, and EFL is the effective focal length of the optical system. By reasonably configuring the ratio of half of the diagonal length of the effective pixel region on the image plane IMA to the effective focal length of the optical system 100, it is beneficial to enable the optical system 100 to have a telephoto characteristic while ensuring that it has a relatively large image plane to present more information about the object being photographed.

[0143] In an exemplary embodiment, as Figure 1 , Figure 3 and Figure 5As shown, the optical system 100 can satisfy: OBJmin ≥ 30 cm. Here, the object distance can be, for example, the distance between the object to be photographed and the optical system 100. When the optical system 100 satisfies the above constraints, it can ensure good imaging effects for the object to be photographed both at close range and at long range.

[0144] In an exemplary embodiment, Figure 7 a schematic optical path diagram of the first lens E1 and the second lens E2 is shown. As Figure 1 , Figure 3 , Figure 5 and Figure 7 shown, as described above, the second lens E2 can be the element closest to the reflection element P in the second element group G2. The optical system 100 can satisfy: 1.5 < tanβ / tanα < 1.8. Here, α is the angle between the marginal ray of the central field of view after passing through the first lens E1 and the optical axis I, and β is the angle between the marginal ray of the central field of view after passing through the second lens E2 and the optical axis II. By reasonably configuring the ratio of the angle α to the angle β, it can ensure that the marginal rays are constrained before and after turning at the reflection element P, so as to ensure that the reflection element P will not affect parameters such as illuminance and CRA.

[0145] When the optical system 100 satisfies: 1.5 < tanβ / tanα < 1.8, during the anti-shake process, the position of the image plane of the optical system 100 remains fixed, and the first lens E1 and the reflection element P rotate together around a direction parallel to the second optical axis. In this way, it can ensure that the marginal rays are constrained before and after turning at the reflection element P, so as to ensure that the reflection element P will not affect parameters such as illuminance and CRA, and it is also beneficial to correct the rotation and jitter generated by the camera module in low-light environments and during video shooting. Furthermore, it is beneficial to improve the performance of the device in night scene shooting and video shooting, and thus meet a wider range of usage requirements.

[0146] In an exemplary embodiment, as Figure 1 , Figure 3 and Figure 5 shown, the optical system 100 can satisfy: 1.4 < L1S1R / EFL < 1.6. Here, L1S1R is the radius of curvature of the object side surface of the first lens E1, and EFL is the effective focal length of the optical system 100. By reasonably configuring the ratio of the radius of curvature of the object side surface of the first lens E1 to the effective focal length of the optical system 100, it helps to balance the light-gathering performance and the optical anti-shake performance.

[0147] If the above constraint condition of the optical system 100 is greater than the maximum value, the radius of curvature of the object side surface of the first lens E1 may be larger, thereby reducing the focusing ability of the first lens E1 on light, and the light collection effect of the incident surface (i.e., the object side surface) of the first lens E1 is not ideal. At the same time, if the radius of curvature of the object side surface of the first lens E1 is too large, the first lens E1 may have a larger size, which will cause the optical system 100 to be bloated. In addition, an excessively large radius of curvature will also limit the optimization and matching of other lenses, resulting in reduced design flexibility. If the above constraint condition of the optical system 100 is less than the minimum value, the radius of curvature of the object side surface of the first lens E1 may be smaller, which will make the processing of the incident surface (i.e., the object side surface) of the first lens E1 more difficult.

[0148] On the other hand, the object side surface of the first lens E1 has a suitable radius of curvature, which helps to reduce the aberration caused by the displacement of light due to shaking, thereby improving the image quality. If L1S1R is large, the light will produce a large displacement during the anti-shake process. Therefore, with a suitable L1S1R, during the anti-shake process, the position of the image plane of the optical system 100 remains fixed, and the first lens E1 and the reflective element P rotate together around a direction parallel to the second optical axis, which helps to improve the anti-shake stability. In addition, constraining L1S1R within a reasonable range can make the light passing through the first lens E1 relatively parallel, thereby helping to reduce aberrations and further help improve the image quality.

[0149] In an exemplary embodiment, Figure 1 , Figure 3 as well as Figure 5 As shown, the optical system 100 may satisfy: 0.8<|L2S2R / EFL|<2.4. Wherein, L2S2R is the radius of curvature of the image side surface of the second lens E2, and EFL is the effective focal length of the optical system 100. As described above, the second lens E2 may be the element closest to the reflective element P in the second element group G2. Reasonable configuration of the ratio of the radius of curvature of the image side surface of the second lens E2 to the effective focal length of the optical system 100 is helpful to balance the imaging quality and the optical image stabilization performance.

[0150] If the above constraint of the optical system 100 is greater than the maximum value, the radius of curvature of the image side surface of the second lens E2 may be larger, so that the focusing ability of the second lens E2 on light is poor, thereby affecting the aberration correction. If the above constraint of the optical system 100 is less than the minimum value, the radius of curvature of the image side surface of the second lens E2 may be smaller, which will make the processing of the image side surface of the second lens E2 more difficult and also affect the aberration compensation effect.

[0151] In addition, the image side surface of the second lens E2 has a suitable radius of curvature. During the anti-shake process, the position of the image plane of the optical system 100 remains fixed, and the first lens E1 and the reflective element P rotate together around a direction parallel to the second optical axis, which can also reduce the influence of aberrations caused by the shaking of light, thereby helping to effectively correct aberrations.

[0152] In the present application, SL represents the total length of the optical system 100 in the direction of the optical axis II, specifically, SL is the distance between the first lens E1 and the image plane IMA on the optical axis II. GH represents the shoulder height of the rear element group (for example, the second element group G2), specifically, GH is determined by the maximum mouth radius of each lens in the second element group G2 in the y direction. SH represents the total height of the optical system 100, specifically, SH is the total height of the optical system 100 in the y direction.

[0153] Those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical system 100 can be changed to obtain the various results and advantages described in this specification.

[0154] Specific embodiments of the optical system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings. Example 1

[0155] The following reference Figure 8 , Fig. 9 , Fig.10 as well as Fig.11 The optical system of Embodiment 1 is described. Figure 8 A schematic structural diagram of an optical system according to Example 1 of the present application is shown.

[0156] like Figure 8 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 is 30 cm to infinity.

[0157] The first element group G1 may include a first lens E1 and a reflective element P. The second element group G2 may include a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. Specifically, the first lens E1 may be located on the optical axis I and disposed between the object side and the reflective element P. The second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5 and the sixth lens E6 are arranged in sequence from the reflective element P to the image side along the optical axis II. The image plane IMA may be located on the optical axis II. For example, a filter EF may be disposed between the sixth lens E6 and the image plane IMA. For example, the aperture STO may be disposed between the reflective element P and the second lens E2.

[0158] 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 positive power, and its object side surface S4 is convex, and its image side surface S5 is concave. The third lens E3 may have negative power, and its object side surface S6 is convex, and its image side surface S7 is concave. The fourth lens E4 may have positive power, and its object side surface S8 is convex, and its image side surface S9 is convex. The fifth lens E5 may have positive power, and its object side surface S10 is concave, and its image side surface S11 is convex. The sixth lens E6 may have negative power, and its object side surface S12 is convex, and its image side surface S13 is concave. The filter EF may have an object side surface SF1 and an image side surface SF2. The light from the object passes through each surface S1 to SF2 in sequence and is finally imaged on the image surface IMA.

[0159] Table 1 shows the basic parameters of the optical system 100 of Example 1. The units of the radius of curvature and thickness / distance are all millimeters (mm). In this embodiment, the positive or negative value of the value of the radius of curvature of each surface indicates 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 properties of the value of the radius of curvature of the surface are opposite. Similarly, the positive or negative value of the value of the thickness / distance of each surface only indicates the direction.

[0160] Table 1

[0161]

[0162] like Figure 8 As shown, during the anti-shake process of the optical system 100, the position of the image plane IMA remains fixed, and the first element group G1 rotates around the z direction.

[0163] During the focusing process of the optical system 100, for example, the position of the image plane IMA remains fixed, the position of the first element group G1 remains fixed, and the second element group G2 moves along the optical axis II, so that the distance between the first element group G1 (i.e., the reflective element P) and the second element group G2 (e.g., the second lens E2) can be adjusted. When the distance between the object and the optical system 100 changes from far to near, the second element group G2 can move along the optical axis II toward the reflective element P, that is, the distance between the second element group G2 and the reflective element P on the optical axis II is reduced. When the distance between the object and the optical system 100 changes from near to far, the second element group G2 can move along the optical axis II toward the image side (e.g., the image plane IMA), that is, the distance between the second element group G2 and the reflective element P on the optical axis II is increased. In the optical system 100, the second element group G2 acts as a movable lens group to play a compensation role.

[0164] During the movement of the second element group G2, the distance w1 between the reflective element P and the reflective surface S3 and the aperture STO on the optical axis II and the distance w2 between the image side surface S13 of the sixth lens E6 and the object side surface SF1 of the filter EF on the optical axis II are variables. When the distance between the object and the optical system 100 is infinite, w1 is -8.7923 mm and w2 is -6.3484 mm. When the distance between the object and the optical system 100 is 30 cm, w1 is -7.0837 mm and w2 is -8.0570 mm.

[0165] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0166] (1)

[0167] 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 i 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 and A 16 .

[0168] Table 2

[0169]

[0170] Fig. 9 The axial chromatic aberration curve of the optical system 100 of Example 1 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical system 100 . Fig.10 The astigmatism curve of the optical system 100 of Example 1 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.11 The distortion curve of the optical system 100 of Example 1 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig. 9 , Fig.10 and Fig.11 It can be seen that the optical system 100 of Example 1 can achieve good imaging quality. Example 2

[0171] The following reference Fig.12 , Fig.13 , Fig.14 as well as Fig.15The optical system of Example 2 is described. In this example and the following examples, some descriptions similar to those of Example 1 will be omitted for the sake of brevity. Fig.12 A schematic structural diagram of an optical system according to Example 2 of the present application is shown.

[0172] like Fig.12 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 is 40 cm to infinity.

[0173] The first element group G1 may include a first lens E1 and a reflective element P. The second element group G2 may include a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. Specifically, the first lens E1 may be located on the optical axis I and disposed between the object side and the reflective element P. The second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5 and the sixth lens E6 are arranged in sequence from the reflective element P to the image side along the optical axis II. The image plane IMA may be located on the optical axis II. For example, a filter EF may be disposed between the sixth lens E6 and the image plane IMA. For example, the aperture STO may be disposed between the reflective element P and the second lens E2.

[0174] 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 positive power, and its object side surface S4 is convex, and its image side surface S5 is concave. The third lens E3 may have negative power, and its object side surface S6 is convex, and its image side surface S7 is concave. The fourth lens E4 may have positive power, and its object side surface S8 is convex, and its image side surface S9 is convex. The fifth lens E5 may have positive power, and its object side surface S10 is concave, and its image side surface S11 is convex. The sixth lens E6 may have negative power, and its object side surface S12 is convex, and its image side surface S13 is concave. The filter EF may have an object side surface SF1 and an image side surface SF2. The light from the object passes through each surface S1 to SF2 in sequence and is finally imaged on the image surface IMA.

[0175] Table 3 shows basic parameters of the optical system 100 of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0176] Table 3

[0177]

[0178] like Fig.12 As shown, during the anti-shake process of the optical system 100, the position of the image plane IMA remains fixed, and the first element group G1 rotates around the z direction.

[0179] During the focusing process of the optical system 100, for example, the position of the image plane IMA remains fixed, the position of the first element group G1 remains fixed, and the second element group G2 moves along the optical axis II, so that the distance between the first element group G1 (i.e., the reflective element P) and the second element group G2 (e.g., the second lens E2) can be adjusted. When the distance between the object and the optical system 100 changes from far to near, the second element group G2 can move along the optical axis II toward the reflective element P, that is, the distance between the second element group G2 and the reflective element P on the optical axis II is reduced. When the distance between the object and the optical system 100 changes from near to far, the second element group G2 can move along the optical axis II toward the image side (e.g., the image plane IMA), that is, the distance between the second element group G2 and the reflective element P on the optical axis II is increased. In the optical system 100, the second element group G2 acts as a movable lens group to play a compensation role.

[0180] During the movement of the second element group G2, the distance w1 between the reflective element P and the reflective surface S3 and the aperture STO on the optical axis II and the distance w2 between the image side surface S13 of the sixth lens E6 and the object side surface SF1 of the filter EF on the optical axis II are variables. When the distance between the object and the optical system 100 is infinite, w1 is -11.6144 mm and w2 is -9.5320 mm. When the distance between the object and the optical system 100 is 40 cm, w1 is -9.2960 mm and w2 is -11.8504 mm.

[0181] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both 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, A 10 , A 12 , A 14 and A 16 .

[0182] Table 4

[0183]

[0184] Fig.13 The axial chromatic aberration curve of the optical system 100 of Example 2 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical system 100. Fig.14 The astigmatism curve of the optical system 100 of Example 2 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.15 The distortion curve of the optical system 100 of Example 2 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.13 , Fig.14 and Fig.15It can be seen that the optical system 100 of Example 2 can achieve good imaging quality. Example 3

[0185] The following reference Fig.16 , Fig.17 , Fig.18 as well as Fig.19 The optical system of Embodiment 3 is described. Fig.16 A schematic structural diagram of an optical system according to Example 3 of the present application is shown.

[0186] like Fig.16 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. An image plane IMA may be provided on the image side. For example, the imageable object distance range of the optical system 100 is 38 cm to infinity.

[0187] The first element group G1 may include a first lens E1 and a reflective element P. The second element group G2 may include a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. Specifically, the first lens E1 may be located on the optical axis I and disposed between the object side and the reflective element P. The second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5 and the sixth lens E6 are arranged in sequence from the reflective element P to the image side along the optical axis II. The image plane IMA may be located on the optical axis II. For example, a filter EF may be disposed between the sixth lens E6 and the image plane IMA. For example, the aperture STO may be disposed between the reflective element P and the second lens E2.

[0188] 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 positive power, and its object side surface S4 is convex, and its image side surface S5 is concave. The third lens E3 may have negative power, and its object side surface S6 is convex, and its image side surface S7 is concave. The fourth lens E4 may have positive power, and its object side surface S8 is convex, and its image side surface S9 is convex. The fifth lens E5 may have positive power, and its object side surface S10 is concave, and its image side surface S11 is convex. The sixth lens E6 may have negative power, and its object side surface S12 is convex, and its image side surface S13 is concave. The filter EF may have an object side surface SF1 and an image side surface SF2. The light from the object passes through each surface S1 to SF2 in sequence and is finally imaged on the image surface IMA.

[0189] Table 5 shows basic parameters of the optical system 100 of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0190] Table 5

[0191]

[0192] like Fig.16 As shown, during the anti-shake process of the optical system 100, the position of the image plane IMA remains fixed, and the first element group G1 rotates around the z direction.

[0193] During the focusing process of the optical system 100, for example, the position of the image plane IMA remains fixed, the position of the first element group G1 remains fixed, and the second element group G2 moves along the optical axis II, so that the distance between the first element group G1 (i.e., the reflective element P) and the second element group G2 (e.g., the second lens E2) can be adjusted. When the distance between the object and the optical system 100 changes from far to near, the second element group G2 can move along the optical axis II toward the reflective element P, that is, the distance between the second element group G2 and the reflective element P on the optical axis II is reduced. When the distance between the object and the optical system 100 changes from near to far, the second element group G2 can move along the optical axis II toward the image side (e.g., the image plane IMA), that is, the distance between the second element group G2 and the reflective element P on the optical axis II is increased. In the optical system 100, the second element group G2 acts as a movable lens group to play a compensation role.

[0194] During the movement of the second element group G2, the distance w1 between the reflective element P and the reflective surface S3 and the aperture STO on the optical axis II and the distance w2 between the image side surface S13 of the sixth lens E6 and the object side surface SF1 of the filter EF on the optical axis II are variables. When the distance between the object and the optical system 100 is infinite, w1 is -10.6761 mm and w2 is -8.3529 mm. When the distance between the object and the optical system 100 is 38 cm, w1 is -8.4786 mm and w2 is -10.5504 mm.

[0195] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both 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 and A 16 .

[0196] Table 6

[0197]

[0198] Fig.17 The axial chromatic aberration curve of the optical system 100 of Example 3 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical system 100 . Fig.18 The astigmatism curve of the optical system 100 of Example 3 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.19 The distortion curve of the optical system 100 of Example 3 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.17 , Fig.18 and Fig.19 It can be seen that the optical system 100 of Example 3 can achieve good imaging quality. Example 4

[0199] The following reference Fig. 20 , Fig.21 , Fig. 22 as well as Fig.23 The optical system of Embodiment 4 is described. Fig. 20 A schematic structural diagram of an optical system according to Example 4 of the present application is shown.

[0200] like Fig. 20 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 is 30 cm to infinity.

[0201] The first element group G1 may include a first lens E1 and a reflective element P. The second element group G2 may include a second lens E2, 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 may be located on the optical axis I and disposed between the object side and the reflective element P. The second lens E2, 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. The second lens E2, the third lens E3 and the fourth lens E4 constitute the first lens group G21. The fifth lens E5, the sixth lens E6 and the seventh lens E7 constitute the second lens group G22. The image plane IMA may be located on the optical axis II. For example, a filter EF may be disposed between the seventh lens E7 and the image plane IMA. For example, the aperture STO may be disposed between the reflective element P and the second lens E2.

[0202] 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 positive power, and its object side surface S4 is convex, and its image side surface S5 is concave. The third lens E3 may have negative power, and its object side surface S6 is convex, and its image side surface S7 is concave. The fourth lens E4 may have positive power, and its object side surface S8 is convex, and its image side surface S9 is convex. The fifth lens E5 may have negative power, and its object side surface S10 is concave, and its image side surface S11 is convex. The sixth lens E6 may have positive power, and its object side surface S12 is concave, and its image side surface S13 is convex. The seventh lens E7 may have negative power, and its object side surface S12 is convex, and its image side surface S13 is concave. The filter EF may have an object side surface SF1 and an image side surface SF2. Light from the object passes through the surfaces S1 to SF2 in sequence and is finally imaged on the image plane IMA.

[0203] Table 7 shows basic parameters of the optical system 100 of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0204] Table 7

[0205]

[0206] like Fig. 20 As shown, during the anti-shake process of the optical system 100, the position of the image plane IMA remains fixed, and the first element group G1 rotates around the z direction.

[0207] During the focusing process of the optical system 100, for example, the position of the image plane IMA remains fixed, the positions of the first element group G1 and the first lens group G21 remain fixed, and the second lens group G22 moves along the optical axis II, so that the distance between the first lens group G21 and the second lens group G22 (for example, the fourth lens E4 and the second lens E2) can be adjusted. When the distance of the object from the optical system 100 is from far to near, the second lens group G22 can move along the optical axis II toward the image side (for example, the image plane IMA), that is, the distance between the second lens group G22 and the first lens group G21 on the optical axis II is increased. When the distance of the object from the optical system 100 is from near to far, the second lens group G22 can move along the optical axis II toward the first lens group G21, that is, the distance between the second lens group G22 and the first lens group G21 on the optical axis II is reduced. In the optical system 100, the second lens group G22 acts as a movable lens group to play a compensation role.

[0208] During the movement of the second lens group G22, the distance w3 between the image side surface S9 of the fourth lens E4 and the object side surface S10 of the fifth lens E5 on the optical axis II and the distance w4 between the image side surface S15 of the seventh lens E7 and the object side surface SF1 of the filter EF on the optical axis II are variables. When the distance between the object and the optical system 100 is infinite, w3 is -1.4627mm and w4 is -6.4689mm. When the distance between the object and the optical system 100 is 30cm, w3 is -3.0306mm and w4 is -4.9010mm.

[0209] 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, A5 10 , A 12 , A 14 , A 16 and A 18 .

[0210] Table 8

[0211]

[0212] Fig.21 The axial chromatic aberration curve of the optical system 100 of Example 4 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical system 100. Fig. 22 The astigmatism curve of the optical system 100 of Example 4 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.23 The distortion curve of the optical system 100 of Example 4 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.21 , Fig. 22 and Fig.23 It can be seen that the optical system 100 of Example 4 can achieve good imaging quality. Example 5

[0213] The following reference Fig.24 , Fig.25 , Fig.26 as well as Fig. 27 The optical system of Embodiment 5 is described. Fig.24 A schematic structural diagram of an optical system according to Example 5 of the present application is shown.

[0214] like Fig.24 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 is 30 cm to infinity.

[0215] The first element group G1 may include a first lens E1 and a reflective element P. The second element group G2 may include a second lens E2, 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 may be located on the optical axis I and disposed between the object side and the reflective element P. The second lens E2, 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. The second lens E2, the third lens E3 and the fourth lens E4 constitute the first lens group G21. The fifth lens E5, the sixth lens E6 and the seventh lens E7 constitute the second lens group G22. The image plane IMA may be located on the optical axis II. For example, a filter EF may be disposed between the seventh lens E7 and the image plane IMA. For example, the aperture STO may be disposed between the reflective element P and the second lens E2.

[0216] The first lens E1 may have positive refractive power, with an object-side surface S1 being convex and an image-side surface S2 being convex.

[0217] The reflective element P may have a reflective surface S3, and the reflective surface S3 is a plane. The second lens E2 may have positive power, and its object side surface S4 is a convex surface, and its image side surface S5 is a concave surface. The third lens E3 may have negative power, and its object side surface S6 is a convex surface, and its image side surface S7 is a concave surface. The fourth lens E4 may have positive power, and its object side surface S8 is a convex surface, and its image side surface S9 is a convex surface. The fifth lens E5 may have negative power, and its object side surface S10 is a concave surface, and its image side surface S11 is a convex surface. The sixth lens E6 may have positive power, and its object side surface S12 is a concave surface, and its image side surface S13 is a convex surface. The seventh lens E7 may have negative power, and its object side surface S12 is a convex surface, and its image side surface S13 is a concave surface. The filter EF may have an object side surface SF1 and an image side surface SF2. The light from the object passes through each surface S1 to SF2 in sequence and is finally imaged on the image surface IMA.

[0218] Table 9 shows basic parameters of the optical system 100 of Example 5, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0219] Table 9

[0220]

[0221] like Fig.24 As shown, during the anti-shake process of the optical system 100, the position of the image plane IMA remains fixed, and the first element group G1 rotates around the z direction.

[0222] During the focusing process of the optical system 100, for example, the position of the image plane IMA remains fixed, the positions of the first element group G1 and the first lens group G21 remain fixed, and the second lens group G22 moves along the optical axis II, so that the distance between the first lens group G21 and the second lens group G22 (for example, the fourth lens E4 and the second lens E2) can be adjusted. When the distance of the object from the optical system 100 is from far to near, the second lens group G22 can move along the optical axis II toward the image side (for example, the image plane IMA), that is, the distance between the second lens group G22 and the first lens group G21 on the optical axis II is increased. When the distance of the object from the optical system 100 is from near to far, the second lens group G22 can move along the optical axis II toward the first lens group G21, that is, the distance between the second lens group G22 and the first lens group G21 on the optical axis II is reduced. In the optical system 100, the second lens group G22 acts as a movable lens group to play a compensation role.

[0223] During the movement of the second lens group G22, the distance w3 between the image side surface S9 of the fourth lens E4 and the object side surface S10 of the fifth lens E5 on the optical axis II and the distance w4 between the image side surface S15 of the seventh lens E7 and the object side surface SF1 of the filter EF on the optical axis II are variables. When the distance between the object and the optical system 100 is infinite, w3 is -1.4376 mm and w4 is -6.8945 mm. When the distance between the object and the optical system 100 is 30 cm, w3 is -2.9244 mm and w4 is -5.4058 mm.

[0224] 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, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0225] Table 10

[0226]

[0227] Fig.25 The axial chromatic aberration curve of the optical system 100 of Example 5 is shown, which indicates the deviation of the focusing point of light rays of different wavelengths after passing through the optical system 100. Fig.26 The astigmatism curve of the optical system 100 of Example 5 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature corresponding to different image heights. Fig. 27The distortion curve of the optical system 100 of Example 5 is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.25 , Fig.26 as well as Fig. 27 It can be seen that the optical system 100 of Example 5 can achieve good imaging quality.

[0228] In the present application, the value range of FOV may be 14.6~25.1, the value range of D1 may be 4.4~6.3, the value range of CT1 may be 1.0~1.4, the value range of f1 may be 43.7~85.9, and the value range of EFL may be 21.2~28.9. m The value range of can be -17.6~36.0, the value range of FG2 can be 25.9~48.6, the value range of SL can be 25.5~42.2, the value range of EPD can be 7.8~12.4, the value range of GH can be 6.6~9.6, the value range of SH can be 8.9~13.3, the value range of ImgH can be 4.0~5.2, the value range of α can be 7.7~8.8, the value range of β can be 11.9~14.4, the value range of L1S1R can be 32.2~45.7, and the value range of L2S2R can be 19.8~63.3. Among them, the units of FOV, α and β are degrees (°), and the units of other parameters are millimeters (mm).

[0229] Table 11 shows the FOV, D1, CT1, f1, EFL, FG2 of each embodiment in Embodiments 1 to 5. m , FG2, SL, EPD, GH, SH, ImgH, α, β, L1S1R and L2S2R values.

[0230] Table 11

[0231]

[0232] Table 12 shows the values ​​of the conditional expressions of each of Examples 1 to 5.

[0233] Table 12

[0234]

[0235] Table 13 shows the ordinate axis value of the defocus curve of each embodiment in Examples 1 to 5. Among them, the defocus curve represents the change of the MTF value when the image plane deviates from the design value. The horizontal axis represents the distance of the image plane deviation forward and backward, and the vertical axis represents the MTF value. The vertical axis value represents the MTF value of the vertical axis when the horizontal axis is 0. Comparative Examples 1-1 to 1-5 represent a non-anti-shake state. Comparative Examples 2-1 to 2-5 represent that the first element group G1 rotates around the y direction to achieve anti-shake. It should be noted that Comparative Examples 1-1 to 1-5 are respectively the same as the structural parameters of the optical system 100 in Examples 1 to 5, and Comparative Examples 2-1 to 2-5 are respectively the same as the structural parameters of the optical system 100 in Examples 1 to 5.

[0236] Table 13

[0237]

[0238] The vertical axis value can reflect the MTF value of the optical system 100 without astigmatism, that is, the imaging quality of the lens at an ideal image plane. The higher the MTF value, the more obvious the imaging contrast, and the better the imaging quality of the optical lens. The central field of view can reflect the upper limit of the imaging quality of the optical system, and the edge field of view can reflect the lower limit of the imaging quality of the optical system. Among them, the edge field of view can be roughly the field of view at the position of 0.8 times the image height.

[0239] As shown in Table 13, by comparing the vertical axis values ​​of the meridian plane and the arc loss plane of the central field of view and the edge field of view, it can be seen that the vertical axis values ​​of Examples 1 to 5 are consistent with those of Comparative Examples 1-1 to 1-5 (i.e., no anti-shake state), indicating that the anti-shake solution provided by Examples 1 to 5 of the present application (i.e., the first element group G1 rotates around the z direction) will not affect the MTF performance. However, compared with the vertical axis values ​​of Comparative Examples 1-1 to 1-5 (i.e., no anti-shake state), the vertical axis values ​​of the anti-shake solution provided by Comparative Examples 2-1 to 2-5 (i.e., the first element group G1 rotates around the y direction) in the edge field of view have a significant decrease, indicating that the anti-shake solution has a greater impact on the vertical axis value of the outer field of view.

[0240] In summary, the optical system 100 provided in the present application has better and more stable ordinate axis value performance in different fields of view (eg, central field of view and edge field of view), good imaging quality and higher production yield. The anti-shake solution provided in the present application is more advantageous.

[0241] 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.

[0242] 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: From the object side to the image side, they include: A first lens having positive refractive power propagates light along a first optical axis; a reflective element, which changes the light emitted from the first lens from propagating along the first optical axis to propagating along the second optical axis, wherein the first lens and the reflective element constitute a first element group; and a second element group having positive optical power; Wherein, during the anti-shake process, the position of the image plane of the optical system remains fixed, and the first element group rotates around a direction parallel to the second optical axis; Wherein, the effective focal length f1 of the first lens and the effective focal length EFL of the optical system satisfy: 1.9<|f1 / EFL|<3.0; The second element group includes a second lens closest to the reflective element, and the angle α between the edge light of the central field of view after passing through the first lens and the first optical axis, and the angle β between the edge light of the central field of view after passing through the second lens and the second optical axis satisfy: 1.5 <tanβ / tanα<1.8。 2. The optical system according to claim 1, wherein: The maximum field of view FOV of the optical system meets the following requirements: 0.1 <tan(FOV / 2)<0.23。 3. The optical system according to claim 1, wherein: The maximum effective semi-aperture D1 of the first lens and the center thickness CT1 of the first lens on the first optical axis satisfy: 4.0 <D1 / CT1<4.7。 4. The optical system according to claim 1, wherein: The second element group includes a movable lens group, the effective focal length of the movable lens group is FG2 m The effective focal length EFL of the optical system satisfies: 0.7<|FG2 m / EFL|<1.

3.

5. The optical system according to claim 1, wherein: The second element group includes a movable lens group, the effective focal length f1 of the first lens and the effective focal length FG2 of the movable lens group m Satisfies: 2.2<|f1 / FG2 m |<2.

6.

6. The optical system according to claim 1, wherein: The effective focal length f1 of the first lens and the effective focal length FG2 of the second element group satisfy: 0.9<|f1 / FG2|<2.

5.

7. The optical system according to claim 1, wherein: The effective focal length EFL of the optical system and the total length SL of the optical system on the second optical axis satisfy: 0.6 <EFL / SL<0.9。 8. The optical system according to claim 1, wherein: The total length of the optical system on the second optical axis and the entrance pupil diameter EPD of the optical system satisfy: 3.2 <SL / EPD<3.5。 9. The optical system according to claim 1, wherein: The shoulder height GH of the optical system and the entrance pupil diameter EPD of the optical system satisfy: 0.7 <GH / EPD<0.9。 10. The optical system according to claim 1, wherein: The total height SH of the optical system and the entrance pupil diameter EPD of the optical system satisfy: 1.0 <SH / EPD<1.15。 11. The optical system according to claim 1, wherein: Half of the diagonal length of the effective pixel area on the image plane ImgH and the effective focal length EFL of the optical system satisfy: 0.1 <ImgH / EFL<0.3。 12. The optical system according to claim 1, wherein: The curvature radius L1S1R of the object side surface of the first lens satisfies the effective focal length EFL of the optical system: 1.4 <L1S1R / EFL<1.6。 13. The optical system according to claim 1, wherein: The second element group includes a second lens closest to the reflective element, and the curvature radius L2S2R of the image side surface of the second lens satisfies the effective focal length EFL of the optical system: 0.8 <L2S2R / EFL<2.4。 14. An optical system according to any one of claims 1 to 13, wherein: The second element group has positive optical power, and during focusing, the second element group moves along the second optical axis.

15. An optical system according to any one of claims 1 to 13, wherein: The second element group includes, in order from the reflective element to the image side: a first lens group having positive optical power; and a second lens group having negative optical power; During the focusing process, the position of the first lens group remains fixed, and the second lens group moves along the second optical axis.

16. An optical system according to any one of claims 1 to 13, wherein: The image plane is perpendicular to the second optical axis.

17. A camera module, characterized in that: The optical system comprises the optical system as claimed in any one of claims 1 to 16 and an imaging element for converting an optical image formed by the optical system into an electrical signal.

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