Optical system, camera module and electronic equipment

Abstract

The embodiment of the invention provides an optical system, a camera module and electronic equipment, and the optical system comprises a reflection assembly, a fixed lens assembly, a first movable lens assembly, a second movable lens assembly and a photosensitive element which are sequentially arranged along a first optical axis. The focal power of the reflection assembly and the first movable lens assembly is positive, and the focal power of the fixed lens assembly and the second movable lens assembly is negative. In the process of zooming from the telephoto end to the wide-angle end, the first movable lens assembly and the second movable lens assembly move towards the direction close to the photosensitive element. Under the condition of a wide-angle end, the first movable lens assembly and the second movable lens assembly move towards the direction deviating from the photosensitive element for focusing; in the process of zooming from the wide-angle end to the telephoto end, the first movable lens assembly and the second movable lens assembly move in the direction away from the photosensitive element. And under the condition of the telephoto end, the second movable lens assembly moves towards the direction close to the photosensitive element for focusing.

Description

Technical Field

[0001] This application relates to the technical field of optical components, and in particular, to an optical system, a camera module, and an electronic device. Background Art

[0002] With the popularization of electronic devices such as mobile phones, the camera function of electronic devices has become increasingly important and has become an important factor for consumers to consider when purchasing electronic devices.

[0003] In related technologies, in order to achieve more shooting effects, a camera module of an electronic device often needs to be provided with multiple different optical systems. Exemplarily, in order to improve the photographic effects in different focal length segments in the telephoto shooting mode, such as the 3x shooting mode and the 5x shooting mode, the camera module usually needs to adopt two sets of optical systems. For example, a 3x fixed-focus lens and a 5x fixed-focus lens are respectively set to achieve the 3x shooting mode and the 5x shooting mode. This increases the volume and weight of the camera module, which is not conducive to the miniaturization design of the electronic device. Summary of the Invention

[0004] Embodiments of this application provide an optical system, a camera module, and an electronic device to solve the problem that the camera module in related technologies uses multiple sets of optical systems to cover different focal lengths, resulting in a relatively large volume of the camera module.

[0005] To solve the above technical problems, this application is implemented as follows: In a first aspect, embodiments of this application provide an optical system.

[0006] The optical system provided by the embodiment of the present application includes: a reflection component, a fixed lens component, a first movable lens component, a second movable lens component, and a photosensitive element, which are sequentially arranged along a first optical axis; the reflection component is configured to reflect the light entering the optical system along a second optical axis to the fixed lens component, the optical powers of the reflection component and the first movable lens component are both positive, and the optical powers of the fixed lens component and the second movable lens component are both negative; the optical system zooms between a wide-angle end and a telephoto end; during the process of the optical system zooming from the telephoto end to the wide-angle end, both the first movable lens component and the second movable lens component move along the second optical axis in a direction approaching the photosensitive element; when the optical system is in the wide-angle end state, both the first movable lens component and the second movable lens component move in a direction away from the photosensitive element for focusing; during the process of the optical system zooming from the wide-angle end to the telephoto end, both the first movable lens component and the second movable lens component move along the second optical axis in a direction away from the photosensitive element; when the optical system is in the telephoto end state, the second movable lens component moves in a direction approaching the photosensitive element for focusing.

[0007] Optionally, the reflection component includes a first lens and a reflector, the optical power of the first lens is positive, and the reflector is configured to reflect the light entering the optical system through the first lens to the fixed lens component.

[0008] Optionally, the reflection component includes a first lens and a prism, the optical power of the first lens is positive, and the prism is configured to reflect the light entering the optical system through the first lens to the fixed lens component.

[0009] Optionally, the reflection component includes a prism, the prism includes an incident surface, a reflection surface, and an exit surface that are sequentially distributed along its circumferential direction, the incident surface is a convex surface, and the exit surface faces the fixed lens component.

[0010] Optionally, when the optical system is in the telephoto end state, the focal length of the optical system is ft; when the optical system is in the wide-angle end state, the focal length of the optical system is fw; ft and fw satisfy the relationship: 1.2 ≤ ft / fw ≤ 2.0.

[0011] Optionally, the focal length of the reflection component is f1; f1 and ft satisfy the relationship: f1 / ft ≥ 5.

[0012] Optionally, when the optical system zooms from the wide-angle end to the telephoto end, the travel of the first movable lens component is D1; D1 satisfies the relationship: 0.3×(ft - fw) < D1 < 0.8×(ft - fw).

[0013] Optionally, when the optical system zooms from the wide-angle end to the telephoto end, the stroke of the second movable lens assembly is D2; D2 satisfies the relational expression: 0.5×(ft-fw) < D2 < 1.2×(ft-fw).

[0014] In a second aspect, an embodiment of the present application provides a camera module.

[0015] The camera module provided by the embodiment of the present application includes: a first driver, a second driver, and any one of the optical systems provided by the embodiment of the present application; the first driver is drivingly connected to the first movable lens assembly, and the second driver is drivingly connected to the second movable lens assembly.

[0016] In a third aspect, an embodiment of the present application provides an electronic device.

[0017] The electronic device provided by the embodiment of the present application includes: a device body and any one of the camera modules provided by the embodiment of the present application.

[0018] The above at least one technical solution adopted in the embodiment of the present application can achieve the following beneficial effects: In the embodiment of the present application, one set of optical system can cover different focal lengths. For example, one set of optical system can cover a focal length from 3 times to 5 times. In this way, one set of optical system can be used to replace two sets of optical systems in the related art, so that the volume of the camera module equipped with the optical system can be reduced.

[0019] In addition, in the embodiment of the present application, there are two sets of focusing schemes for two different focusing scenarios with different object distances. Among them, when the optical system is at the wide-angle end, both the first movable lens assembly and the second movable lens assembly move away from the photosensitive element for focusing. When the optical system is at the telephoto end, the second movable lens assembly moves towards the photosensitive element for focusing. This focusing method can save space and contribute to the miniaturization of the camera module equipped with the optical system.

[0020] In addition, the reflecting component has a positive optical power, which can also reduce the total length of the camera module equipped with the optical system, contributing to the miniaturization of the camera module equipped with the optical system.

[0021] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the first optical system provided by the embodiment of the present application, which shows the situation of the optical system at the wide-angle end; Figure 2 It is a schematic diagram of the first optical system provided by the embodiment of the present application, which shows the situation of the optical system at the telephoto end; Figure 3 It is a schematic diagram of the second optical system provided by the embodiment of the present application, which shows the situation of the optical system at the wide-angle end; Figure 4 It is a schematic diagram of the second optical system provided by the embodiment of the present application, which shows the situation of the optical system at the telephoto end; Figure 5 It is a parameter specification table of an optical system provided by the embodiment of the present application; Figure 6 It is a parameter table of the surface type, radius of curvature, thickness, refractive index, Abbe number, etc. of each component of an optical system provided by the embodiment of the present application; Figure 7 It is the aspheric conic coefficient and partial higher-order term coefficients of each lens surface of an optical system provided by the embodiment of the present application; Figure 8 It is another part of the higher-order term coefficients of each lens surface of an optical system provided by the embodiment of the present application; Figure 9 It is the lateral chromatic aberration of the optical system provided by the embodiment of the present application when it is at the wide-angle end; Figure 10 It is the modulation transfer function defocus map of the optical system provided by the embodiment of the present application when it is at the wide-angle end; Figure 11 It is the lateral chromatic aberration of the optical system provided by the embodiment of the present application when it is at the telephoto end; Figure 12 It is the modulation transfer function defocus map of the optical system provided by the embodiment of the present application when it is at the telephoto end; Figure 13 It is a schematic diagram of the third optical system provided by the embodiment of the present application; Figure 14 It is a schematic diagram of the fourth optical system provided by the embodiment of the present application.

[0024] Description of reference numerals: 100-optical system; 110-reflection component; 111-first lens; 112-reflector; 113-prism; 1131-incident surface; 1132-reflection surface; 1133-exit surface; 120-fixed lens assembly; 121-second lens; 130 - first movable lens assembly; 131 - third lens; 132 - fourth lens; 133 - fifth lens; 134 - sixth lens; 140 - second movable lens assembly; 141 - seventh lens; 142 - eighth lens; 143 - ninth lens; 150-photosensitive element; 160-infrared filter; L1-first optical axis; L2-second optical axis. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] Furthermore, although the terms used in this application are selected from well-known and commonly used terms, some of the terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article.

[0028] Furthermore, it is required that the present application be understood not only by the actual terms used but also by the meanings connoted by each term.

[0029] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0030] The present application embodiment provides an optical system. Figures 1 to 14, the optical system 100 provided by the embodiments of the present application includes: a reflection component 110, a fixed lens component 120, a first movable lens component 130, a second movable lens component 140, and a photosensitive element 150, which are arranged in sequence along the first optical axis L1.

[0031] The reflection component 110 is configured to reflect the light rays incident on the optical system 100 along the second optical axis L2 to the fixed lens component 120. The optical powers of the reflection component 110 and the first movable lens component 130 are both positive, and the optical powers of the fixed lens component 120 and the second movable lens component 140 are both negative. In other words, the reflection component 110 and the first movable lens component 130 have positive optical powers, and the fixed lens component 120 and the second movable lens component 140 have negative optical powers.

[0032] It should be noted that the positive or negative sign of the optical power indicates the degree of convergence or divergence of the optical system to the incident light beam. In an optical system, a positive optical power indicates that the lens has a converging effect on light rays, while a negative optical power indicates that the lens has a diverging effect on light rays. For example, a convex lens has a positive optical power because it converges light rays; a concave lens has a negative optical power because it diverges light rays.

[0033] The optical system 100 zooms between the wide-angle end and the telephoto end. Among them, Figure 1 shows the situation where the optical system 100 is at the wide-angle end, Figure 2 shows the situation where the optical system 100 is at the telephoto end. The optical system 100 can zoom between the wide-angle end and the telephoto end by driving the fixed lens component 120 and the second movable lens component 140 to move along the second optical axis L2 respectively.

[0034] It should be noted that zooming can change the perspective of the captured image; focusing can adjust the clarity of the captured image.

[0035] It should also be noted that the wide-angle end and the telephoto end are two key parameters in a zoom lens. Among them, the wide-angle end refers to the end with a shorter lens focal length, which is usually used for shooting large-range scenes; the telephoto end refers to the end with a longer lens focal length, which is used to zoom in on distant scenes and magnify details. For example, the focal length of the optical system 100 ranges from 3 times the focal length to 5 times the focal length; then, when the optical system is in the state of 3 times the focal length, it can be said that the optical system is at the wide-angle end; when the optical system is in the state of 5 times the focal length, it can be said that the optical system is at the telephoto end.

[0036] In addition, during the shooting process, the perspective of the captured image can be adjusted to a suitable angle by zooming first, and then the clarity of the captured image can be improved by focusing.

[0037] In an embodiment of the present application, during the process of the optical system 100 zooming from the telephoto end to the wide-angle end, both the first movable lens assembly 130 and the second movable lens assembly 140 move along the second optical axis L2 in a direction approaching the photosensitive element 150. For example, referring to Figure 1 and Figure 2 , the first movable lens assembly 130 and the second movable lens assembly 140 at the positions shown in Figure 2 both move in the left-to-right direction to the positions shown in Figure 1 .

[0038] When the optical system 100 is at the wide-angle end, both the first movable lens assembly 130 and the second movable lens assembly 140 move in a direction away from the photosensitive element 150 for focusing.

[0039] During the process of the optical system 100 zooming from the wide-angle end to the telephoto end, both the first movable lens assembly 130 and the second movable lens assembly 140 move along the second optical axis L2 in a direction away from the photosensitive element 150. For example, referring to Figure 1 and Figure 2 , the first movable lens assembly 130 and the second movable lens assembly 140 at the positions shown in Figure 1 both move in the right-to-left direction to the positions shown in Figure 2 .

[0040] When the optical system 100 is at the telephoto end, the second movable lens assembly 140 moves in a direction approaching the photosensitive element 150 for focusing.

[0041] In this way, in an embodiment of the present application, a set of optical system 100 can cover different focal lengths. For example, a set of optical system 100 can cover a focal length from 3 times to 5 times. In this way, a set of optical system 100 can be used to replace two sets of optical systems in the related art, so that the volume of the camera module equipped with the optical system 100 can be reduced.

[0042] In addition, in an embodiment of the present application, there are two sets of focusing schemes for two different object distance focusing scenarios. Among them, when the optical system 100 is at the wide-angle end, both the first movable lens assembly 130 and the second movable lens assembly 140 move in a direction away from the photosensitive element 150 for focusing. When the optical system 100 is at the telephoto end, the second movable lens assembly 140 moves in a direction approaching the photosensitive element 150 for focusing. This focusing method can save space and contribute to the miniaturization of the camera module equipped with the optical system 100.

[0043] In addition, the reflecting component 110 has a positive optical power, which can also reduce the total length of the camera module equipped with the optical system 100, contributing to the miniaturization of the camera module equipped with the optical system 100.

[0044] In some embodiments, when the optical system 100 is at the telephoto end, the focal length of the optical system 100 is ft; when the optical system 100 is at the wide-angle end, the focal length of the optical system 100 is fw; ft and fw satisfy the relationship: 1.2 ≤ ft / fw ≤ 2.0. In this way, the optical system 100 can have an appropriate zoom ratio, improving the imaging effect of the optical system 100.

[0045] In some embodiments, the focal length of the reflecting component 110 is f1; f1 and ft satisfy the relationship: f1 / ft ≥ 5. In this way, when the optical system 100 realizes the anti-shake function through the reflecting component 110, by making f1 / ft ≥ 5, the sensitivity of the reflecting component 110 can be reduced, thereby reducing the loss of anti-shake clarity and improving the anti-shake effect.

[0046] In some embodiments, when the optical system 100 zooms from the wide-angle end to the telephoto end, the stroke of the first movable lens group 130 is D1; D1 satisfies the relationship: 0.3×(ft - fw) < D1 < 0.8×(ft - fw).

[0047] It should be noted that the stroke of the first movable lens group 130 being D1 is adapted to the zoom range (ft - fw) of the optical system 100. On the one hand, a small zoom stroke can be achieved, reducing the requirement for a large-stroke motor; on the other hand, it ensures that the zoom group has an appropriate sensitivity, reducing the requirement for the motor stroke accuracy, enabling the optical system 100 to perform zooming and focusing quickly and accurately.

[0048] In some embodiments, when the optical system 100 zooms from the wide-angle end to the telephoto end, the stroke of the second movable lens group 140 is D2; D2 satisfies the relationship: 0.5×(ft - fw) < D2 < 1.2×(ft - fw).

[0049] It should be noted that the stroke of the second movable lens group 140 being D2 is adapted to the zoom range (ft - fw) of the optical system 100. On the one hand, a small zoom stroke can be achieved, reducing the requirement for a large-stroke motor; on the other hand, it ensures that the zoom group has an appropriate sensitivity, reducing the requirement for the motor stroke accuracy, enabling the optical system 100 to perform zooming and focusing quickly and accurately.

[0050] Reference Figure 3 and Figure 4, in some embodiments, the reflection component 110 includes a first lens 111 and a mirror 112. The optical power of the first lens 111 is positive, and the mirror 112 is configured to reflect the light rays that enter the optical system 100 through the first lens 111 to the fixed lens assembly 120. Exemplarily, the Abbe number Vd of the first lens 111 is 19.3.

[0051] In the embodiments of the present application, the fixed lens assembly 120 has a negative optical power. For example, the fixed lens assembly 120 includes a second lens 121. Of course, in other embodiments, the fixed lens assembly 120 may further include other lenses, which will not be listed one by one here. Exemplarily, the Abbe number Vd of the second lens 121 is 55.7. The fixed lens assembly 120 and the reflection component 110 form a lens combination with positive and negative optical powers, which can effectively eliminate the spherical aberration of the optical system 100.

[0052] The first movable lens assembly 130 includes at least three lenses. For example, the first movable lens assembly 130 includes four lenses. The lenses included in the first movable lens assembly 130 are all aspherical lenses. Exemplarily, in the direction along the second optical axis towards the photosensitive element 150, the first movable lens assembly 130 includes a third lens 131 with a positive optical power, a fourth lens 132 with a positive optical power, a fifth lens 133 with a negative optical power, and a sixth lens 134 with a positive optical power that are sequentially and spaced apart.

[0053] The third lens 131 is made of an ultra-low dispersion glass material. The refractive index Nd of the third lens 131 is 1.5, and the Abbe number Vd is 81.6. In this way, by using the ultra-low dispersion material to make the third lens 131, the chromatic aberration of the optical system 100 can be well reduced.

[0054] The second movable lens assembly 140 includes at least two lenses. For example, the second movable lens assembly 140 includes three lenses. The lenses included in the second movable lens assembly 140 are all aspherical lenses. Exemplarily, in the direction along the second optical axis towards the photosensitive element 150, the second movable lens assembly 140 includes a seventh lens 141 with a negative optical power, an eighth lens 142 with a positive optical power, and a ninth lens 143 with a negative optical power that are sequentially and spaced apart.

[0055] In some embodiments, the optical system 100 further includes an infrared filter 160. The infrared filter 160 is disposed between the second movable lens assembly 140 and the photosensitive element 150.

[0056] In some embodiments, the parameter specifications of the optical system 100 refer to Figure 5Wherein, f1 is the focal length of the reflective assembly 110, f2 is the focal length of the fixed lens assembly 120, f3 is the focal length of the first movable lens assembly 130, f4 is the focal length of the second movable lens assembly 140, and L is the length of the optical system 100 along the second optical axis L1.

[0057] In some embodiments, the surface type, curvature radius, thickness, refractive index and Abbe number of each component of the optical system 100 are referenced to Figure 6 It should be noted that the units of the radius of curvature and thickness are both millimeters.

[0058] It should be noted that the S1 surface of the first lens 111 is the side of the first lens 111 facing the object along the optical path direction of the optical system 100. The S2 surface of the first lens 111 is the side of the first lens 111 that is opposite to the S1 surface along the optical path direction of the optical system 100. The surfaces of other components are analogous in this way and will not be described in detail here. In addition, the S6 surface of the third lens 131 is provided with an aperture. Therefore, the S6 surface of the third lens 131 can be called an aperture surface.

[0059] It should also be noted that Figure 6 As shown in FIG. 1 , the thickness of the S1 surface of the first lens 111 is the distance between the intersection of the S1 surface of the first lens 111 and the first optical axis L2 and the intersection of the S2 surface of the first lens 111 and the first optical axis L2. The thickness of the S3 surface of the reflector 112 is the distance between the intersection of the reflector 112 and the second optical axis L1 and the intersection of the S4 surface of the second lens 121 and the second optical axis L1.

[0060] In the optical system, in the process of describing the surface thickness, the spacing after one reflection is taken as a negative value, so the thickness of the S3 surface of the reflector 112 is -8.1 mm. In addition, if it is reflected twice, the spacing is taken as a negative value again, so the thickness of the surface becomes a positive value, and so on. Other similar parameters are understood with reference to this example and will not be explained one by one in the following.

[0061] In addition, the thickness of the S5 surface of the second lens 121 is -6.5 / -2.6 mm, which means that when the optical system 100 is at the wide-angle end, the intersection of the S5 surface of the second lens 121 and the second optical axis L1 and the intersection of the S6 surface of the third lens 131 and the second optical axis L1 are spaced 6.5 mm. When the optical system 100 is at the telephoto end, the intersection of the S5 surface of the second lens 121 and the second optical axis L1 and the intersection of the S6 surface of the third lens 131 and the second optical axis L1 are spaced 2.6 mm. Other similar parameters are understood with reference to this example and will not be explained one by one later.

[0062] In addition, for a surface with a convex surface, the radius of curvature of the surface is positive, and for a surface with a concave surface, the radius of curvature of the surface is negative. The two side surfaces of the infrared filter 160 are flat surfaces, and the two side surfaces of the infrared filter 160 can be regarded as spherical surfaces with an infinite radius of curvature.

[0063] In some embodiments, the aspherical surface parameters of each lens satisfy the following formula:

[0064] where ρ is the curvature of the surface, and the curvature is the reciprocal of the radius of curvature; r is the perpendicular distance from a point on the optical surface to the optical axis; Z is the sagittal height in the direction of the optical axis of the point at a perpendicular distance r from the optical axis; K is the conic coefficient of the optical surface, and Ai represents the i-th order aspherical coefficient. For example, referring to Figure 7 , A4 is the 4th order aspherical coefficient, and A8 is the 8th order aspherical coefficient. The other order aspherical coefficients can be taken as zero.

[0065] Figure 7 and Figure 8 are the conic coefficients and high-order term coefficients of the aspherical surfaces of each lens surface. Figure 7 and Figure 8 The "E" shown in

[0066] Figure 9 represents the power of 10. For example, "5.12E+01" represents 5.12 multiplied by 10 to the power of 1. This will not be explained one by one hereafter. Figure 10 is the lateral chromatic aberration when the optical system 100 is at the wide-angle end, Figure 11 is the lateral chromatic aberration when the optical system 100 is at the telephoto end, Figure 12 is the modulation transfer function (MTF) defocus map when the optical system 100 is at the telephoto end.

[0067] From the five solid curves in the chromatic aberration map, which are the color lights with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm respectively, it can be seen that the axial chromatic aberration of the optical system 100 in this embodiment is controlled within a very small range, and the chromatic aberration converges well. From the modulation transfer function defocus map, it can be seen that at a spatial frequency of 100 lp / mm, the modulation of the full field of view is greater than 0.5, indicating extremely high resolution.

[0068] Refer to Figure 13, in some embodiments, the reflection component 110 includes a first lens 111 and a prism 113. The optical power of the first lens 111 is positive, and the prism 113 is configured to reflect the light rays that enter the optical system 100 through the first lens 111 to the fixed lens assembly 120.

[0069] Exemplarily, the prism 113 includes an incident surface 1131, a reflection surface 1132, and an exit surface 1133 that are sequentially distributed along its circumferential direction. For example, the incident surface 1131, the reflection surface 1132, and the exit surface 1133 are all flat surfaces. The exit surface 1133 faces the fixed lens assembly 120. The light rays enter the prism 113 through the incident surface 1131, are reflected at the reflection surface 1132, and then are directed to the fixed lens assembly 120 after reaching the exit surface 1133.

[0070] Reference Figure 14 , in some embodiments, the reflection component 110 includes a prism 113. Exemplarily, the prism 113 includes an incident surface 1131, a reflection surface 1132, and an exit surface 1133 that are sequentially distributed along its circumferential direction. For example, the incident surface 1131 is a convex surface. The reflection surface 1132 and the exit surface 1133 are both flat surfaces. The exit surface 1133 faces the fixed lens assembly 120. The light rays enter the prism 113 through the incident surface 1131, are reflected at the reflection surface 1132, and then are directed to the fixed lens assembly 120 after reaching the exit surface 1133.

[0071] An embodiment of the present application provides a camera module. The camera module provided by the embodiment of the present application includes: a first driver, a second driver, and any one of the optical systems 100 provided by the embodiment of the present application. The first driver is drivingly connected to the first movable lens assembly 130, and the second driver is drivingly connected to the second movable lens assembly 140.

[0072] Exemplarily, the first driver is a first focusing motor. The second driver is a second focusing motor. The first focusing motor and the second focusing motor can respectively drive the first movable lens assembly 130 and the second movable lens assembly 140 to move for focusing. In addition, when the optical system 100 is at the wide-angle end, the first focusing motor and the second focusing motor can respectively drive the first movable lens assembly 130 and the second movable lens assembly 140 to finely adjust in a direction away from the photosensitive element 150 for focusing. When the optical system 100 is at the telephoto end, the second focusing motor can drive the second movable lens assembly 140 to finely adjust in a direction close to the photosensitive element 150 for focusing.

[0073] Exemplarily, the camera module further includes a third driver. The third driver is drivingly connected to the reflection component 110. For example, the third driver is an anti-shake motor. In this way, the anti-shake function can be achieved by driving the reflection component 110 to finely adjust through the third driver.

[0074] In an embodiment of the present application, the fixed lens assembly 120 is fixedly arranged. Therefore, there is no need to configure a driving motor for the fixed lens assembly 120. Exemplarily, the camera module further includes a housing. The fixed lens assembly 120 is fixed relative to the housing of the camera module. In addition, in some embodiments, the photosensitive element 150 and the infrared filter 160 are also fixedly arranged. The photosensitive element 150 and the infrared filter 160 are also fixed relative to the housing of the camera module. Since the fixed lens assembly 120, the photosensitive element 150, and the infrared filter 160 are all fixed relative to the housing of the camera module, the fixed lens assembly 120 is also fixed relative to the photosensitive element 150 and the infrared filter 160.

[0075] An embodiment of the present application provides an electronic device. The electronic device provided by the embodiment of the present application includes: a device body and any one of the camera modules provided by the embodiment of the present application. Exemplarily, when the electronic device is a mobile phone, the light incident portion of the camera module faces away from the display side of the mobile phone screen. In other words, the camera module is a rear camera of the mobile phone. Of course, in other embodiments, the arrangement position of the camera module can also be flexibly adjusted according to requirements, which will not be elaborated here.

[0076] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0077] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the embodiments of the present application. The scope of the embodiments of the present application is defined by the appended claims and their equivalents.

Claims

1. An optical system, characterized in that, Comprising: A reflecting component (110), a fixed lens component (120), a first movable lens component (130), a second movable lens component (140), and a photosensitive element (150) arranged in sequence along a first optical axis (L1); The reflecting component (110) is configured to reflect the light entering the optical system along a second optical axis (L2) to the fixed lens component (120). The optical powers of both the reflecting component (110) and the first movable lens component (130) are positive, and the optical powers of both the fixed lens component (120) and the second movable lens component (140) are negative; The optical system zooms between a wide-angle end and a telephoto end; During the process of the optical system zooming from the telephoto end to the wide-angle end, both the first movable lens component (130) and the second movable lens component (140) move along the second optical axis (L2) in a direction approaching the photosensitive element (150); When the optical system is at the wide-angle end, both the first movable lens component (130) and the second movable lens component (140) move in a direction away from the photosensitive element (150) for focusing; During the process of the optical system zooming from the wide-angle end to the telephoto end, both the first movable lens component (130) and the second movable lens component (140) move along the second optical axis (L2) in a direction away from the photosensitive element (150); When the optical system is at the telephoto end, the second movable lens component (140) moves in a direction approaching the photosensitive element (150) for focusing.

2. The optical system according to claim 1, wherein The reflecting component (110) includes a first lens (111) and a reflecting mirror (112). The optical power of the first lens (111) is positive, and the reflecting mirror (112) is configured to reflect the light entering the optical system through the first lens (111) to the fixed lens component (120).

3. The optical system according to claim 1, wherein The reflecting component (110) includes a first lens (111) and a prism (113). The optical power of the first lens (111) is positive, and the prism (113) is configured to reflect the light entering the optical system through the first lens (111) to the fixed lens component (120).

4. The optical system according to claim 1, characterized in that The reflecting component (110) includes a prism (113). The prism (113) includes an incident surface (1131), a reflecting surface (1132), and an exit surface (1133) that are sequentially distributed along its circumferential direction. The incident surface (1131) is a convex surface, and the exit surface (1133) faces the fixed lens component (120).

5. The optical system according to any one of claims 1 to 4, characterized in that, When the optical system is at the telephoto end, the focal length of the optical system is ft; when the optical system is at the wide-angle end, the focal length of the optical system is fw; ft and fw satisfy the relationship: 1.2 ≤ ft / fw ≤ 2.

0.

6. The optical system according to claim 5, characterized in that, The focal length of the reflecting component (110) is f1; f1 and ft satisfy the relationship: f1 / ft ≥ 5.

7. The optical system according to claim 5, characterized in that When the optical system zooms from the wide-angle end to the telephoto end, the stroke of the first movable lens assembly (130) is D1; D1 satisfies the relation: 0.3×(ft-fw) < D1 < 0.8×(ft-fw).

8. The optical system according to claim 5, characterized in that, When the optical system zooms from the wide-angle end to the telephoto end, the stroke of the second movable lens assembly (140) is D2; D2 satisfies the relation: 0.5×(ft-fw) < D2 < 1.2×(ft-fw).

9. A camera module, characterized in that, Comprising: A first driver, a second driver, and the optical system according to any one of claims 1 to 8; The first driver is drivingly connected to the first movable lens assembly (130), and the second driver is drivingly connected to the second movable lens assembly (140).

10. An electronic device, characterized in that, Comprising: A device body and the camera module according to claim 9.

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