Light turning module, assembling method thereof and periscopic camera module

Abstract

The invention discloses a light turning module, an assembling method thereof and a periscopic camera module. The light turning module comprises a reflecting element, a first lens and a second lens. The first lens is located on the light incident side of the reflecting element and is spaced from the reflecting element. At least one side surface of the first lens has a non-planar surface type. The second lens is located on the light emitting side of the reflecting element and is spaced from the reflecting element. At least one side surface of the second lens has a non-planar surface type. The first lens is used as a light correction element located on the light incident side of the reflection element; the second lens is used as a light correction element located on the light emitting side of the reflection element; according to the periscopic camera module, the light incoming amount of the lens module can be increased, so that the periscopic camera module realizes a large aperture without increasing the height of the module, and the imaging effect of the lens is improved.

Description

Technical Field

[0001] This application relates to the field of camera modules, and more specifically, to light-transformation modules and their assembly methods and periscope camera modules. Background Technology

[0002] In recent years, the widespread adoption of portable electronic products such as mobile phones, tablets, and digital cameras has led to the rapid development of camera lens technology. Simultaneously, the trend towards thinner and lighter designs in these electronic products has increased the demand for miniaturized mobile phone cameras. To avoid deteriorating image quality, it is crucial to ensure excellent image quality while shortening the length of the mobile phone camera. Furthermore, in addition to miniaturization, users also desire high-resolution cameras, large apertures, and long focal lengths. Summary of the Invention

[0003] The main advantage of this application is that it provides an optical deflection module and its assembly method, as well as a periscope camera module, wherein the periscope camera module adopts a specific optical system design, which enables it to achieve a large aperture.

[0004] Another advantage of this application is that it provides an optical deflection module and its assembly method, as well as a periscope camera module, wherein the periscope camera module can achieve a large aperture while keeping the weight and size of the optical deflection module within a certain range as much as possible, thereby minimizing the increase in the size and weight of the periscope camera module, and also minimizing the increase in the requirements for driving force.

[0005] Another advantage of this application is that it provides a light-converting module and its assembly method, as well as a periscope camera module. The periscope camera module has specific light correction elements on both the light-incident and light-out sides of the reflective element, which can correct the light incident on the reflective element and the light reflected from the reflective element, thereby improving the light utilization rate and increasing the light intake of the lens module. This allows the periscope camera module to improve the imaging effect of the lens even without increasing the module height.

[0006] Another advantage of this application is that it provides a light-converting module and its assembly method, as well as a periscope camera module, wherein the periscope camera module performs multiple light corrections on the light incident side or light exit side of the reflective element, which can improve the correction effect to a certain extent.

[0007] Another advantage of this application is that it provides a light-converting module and its assembly method and a periscope camera module, wherein the configuration structure and arrangement of the reflective element and the light-correcting element allow a single light-correcting element to be corrected multiple times on the light-incident side or the light-outcident side of the reflective element.

[0008] According to one aspect of this application, an optical transition module is provided, comprising:

[0009] Reflective element;

[0010] A first lens, located on the incident side of the reflecting element and spaced apart from the reflecting element; at least one side of the first lens has a non-planar surface shape; and

[0011] The second lens is located on the light-emitting side of the reflecting element and is spaced apart from the reflecting element; at least one side of the second lens has a non-planar surface shape.

[0012] In the light-converting module according to this application, the first lens is configured to converge light rays; the second lens is configured to expand light rays, such that light rays are incident on the first lens along a first direction and converged by the first lens before exiting from the first lens, reaching the reflective element, and then reflected by the reflective element before exiting along a second direction, reaching the second lens, and being expanded by the second lens before exiting.

[0013] In the light-converting module according to this application, the first lens is further configured such that the light rays after being converged by it are emitted along a direction intersecting with the first direction; the second lens is further configured such that the light rays after being expanded by it are emitted along a direction that is approximately parallel to the second direction.

[0014] In the light-converting module according to this application, the first lens has a first lens side surface and a first lens side surface, wherein the first lens side surface faces away from the reflecting element, and the first lens side surface faces the reflecting element; the first lens side surface has a convex surface shape, and the first lens side surface has a convex surface shape; the first lens side surface is configured to converge light rays; and the first lens side surface is configured to converge light rays again.

[0015] In the light-shifting module according to this application, the second lens has a second lens side surface and a second lens side surface, wherein the second lens side surface faces the reflecting element, and the second lens side surface faces away from the reflecting element; the second lens side surface has a concave surface shape, and the second lens side surface has a concave surface shape; the second lens side surface is configured to expand the light beam; the second lens side surface is configured to further expand the light beam.

[0016] In the light-deflecting module according to this application, the reflecting element is a plane mirror, which is configured to deflect light incident along a first direction into light emitted along a second direction. The plane mirror has a reflecting surface, which has a certain angle with the first direction and the second direction. The angle between the reflecting surface and the first direction is 30°-60°, and the angle between the reflecting surface and the second direction is 30°-60°.

[0017] In the optical deflection module according to this application, the optical deflection module further includes a reflective bracket and a driving element for the deflection module. The reflective bracket has a support portion, a first mounting portion, and a second mounting portion, wherein the first mounting portion extends from the support portion toward the light-incident side of the optical deflection module; the second mounting portion extends from the support portion toward the light-outceasing side of the optical deflection module; the reflective element is mounted on the support portion; the first lens is mounted on the first mounting portion; the second lens is mounted on the second mounting portion; the driving element for the deflection module is configured to drive the reflective bracket to move, thereby driving the reflective element, the first lens, and the second lens to move through the reflective bracket to perform optical image stabilization.

[0018] According to another aspect of this application, a periscope camera module is also provided, comprising:

[0019] The light-transformation module as described above;

[0020] A lens module, located on the light-emitting side of the light-shifting module, is used to receive light rays from the light-shifting module; and

[0021] A photosensitive module, located on the light-emitting side of the lens module, is used to receive light from the lens module.

[0022] According to another aspect of this application, a method for assembling an optical transition module is also provided, comprising the steps of:

[0023] A second lens is mounted on the light-emitting side of the reflecting element and spaced apart from the reflecting element, wherein at least one side of the second lens has a non-planar surface type; and

[0024] A first lens is mounted on the light-incident side of the reflecting element and spaced apart from the reflecting element, wherein at least one side of the first lens has a non-planar surface.

[0025] In the assembly method of the light-converting module according to this application, before installing the second lens on the light-emitting side of the reflective element, the assembly method further includes the steps of: installing the reflective element on a reflective bracket; during the process of installing the second lens on the light-emitting side of the reflective element, aligning the second lens with the light-emitting side of the reflective element and then fixing the second lens on the reflective bracket using an adhesive medium to form a semi-finished light-converting module; during the process of installing the first lens on the light-incident side of the reflective element, determining the relative position of the first lens and the semi-finished light-converting module through active calibration, and fixing the first lens on the reflective bracket using an adhesive medium based on the actively calibrated relative position to form the light-converting module.

[0026] The further objectives and advantages of this application will become fully apparent from the following description and accompanying drawings.

[0027] These and other objects, features and advantages of this application are fully apparent from the following detailed description, the accompanying drawings and the claims. Attached Figure Description

[0028] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0029] Figure 1 The figure shows a perspective view of a periscope camera module according to an embodiment of this application.

[0030] Figure 2 The figure shows a cross-sectional schematic diagram of a periscope camera module according to an embodiment of the present application.

[0031] Figure 3 The diagram illustrates the optical path of an optical system without a second lens on the light-emitting side of the reflective element.

[0032] Figure 4 The figure shows a schematic diagram of the optical path of a periscope camera module according to an embodiment of this application.

[0033] Figure 5 The illustration shows a flowchart of an assembly method for a periscope camera module according to an embodiment of this application.

[0034] Figure 6 The illustration shows a flowchart of the assembly method of the light deflection module of the periscope camera module according to an embodiment of the present application. Detailed Implementation

[0035] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0036] Application Overview

[0037] Periscope camera modules primarily achieve long-focal-length shooting by bending the optical path. By increasing the focal length through optical path bending, the height of the periscope camera module is similar to that of a linear module, thus meeting the size requirements of terminal devices.

[0038] Specifically, the periscope camera module has a prism on the object side of the lens assembly. The prism reflects the light incident on the object side of the camera module to change the direction of the light. The deflected light passes through the lens assembly and color filter and reaches the photosensitive chip. This allows the camera module to be installed horizontally in the electronic device, ensuring that the periscope camera module can achieve the effect of long focal length shooting while reducing the height of the periscope camera module.

[0039] Therefore, periscope camera modules can reduce module height by changing the angle of incident light and reasonably altering the long lens structure, thus largely achieving the requirements of miniaturization of terminal devices and optical zoom. Here, "the camera module is installed in the electronic device in a horizontal manner" means that the camera module is installed in the electronic device with its lens assembly and image sensor optical axis offset from the thickness direction of the electronic device (e.g., mobile phone), for example, at a 90-degree angle.

[0040] Current periscope camera modules still cannot fully meet market demands. This is understandable, as the aperture directly affects the periscope camera module's capabilities in night scene photography, snapshots, background blur, and video recording. Furthermore, using a large aperture (smaller F-number) lens can enhance background blur and highlight the subject, while also improving shutter speed and autofocus speed, resulting in better image quality.

[0041] However, the demand for large apertures in periscope camera modules contradicts the trend and driving force of miniaturization and thinning of terminal devices. Specifically, the limited size of the light-receiving and light-receiving surfaces of the prism restricts the area of ​​light received, resulting in less light entering the lens and a smaller effective aperture. This leads to problems such as poor low-light performance and unsatisfactory bokeh.

[0042] As the aperture of a periscope camera module increases, the size of the prism also needs to increase, leading to a greater weight for the prism and consequently increasing the overall size and weight of the periscope camera module. Furthermore, when using a motor to drive the prism for optical image stabilization, the larger and heavier prism places higher demands on the motor's thrust. The increased size and weight of the prism also mean it occupies more space within the periscope camera module, leaving less space for the motor and impacting its performance. The dual requirements of increasing driving force and reducing installation space undoubtedly place higher demands on the motor.

[0043] In one embodiment of this application, a light correction element with a non-planar surface is provided on the light-incident side of the reflective element to adjust the direction of the light rays incident on the reflective element, thereby achieving light beam convergence. By converging the light rays, the amount of light entering the camera is increased, allowing the periscope camera module to increase its effective aperture without increasing the module height. A light correction element with a non-planar surface is also provided on the light-outceasing side of the reflective element to adjust the light rays reflected by the reflective element, thereby achieving light beam expansion, so that the light rays reflected by the reflective element are emitted to the lens module in a preset manner.

[0044] Furthermore, the light correction element disposed on the light-incident side of the reflective element can be disposed on the reflective element by integral molding or by post-molding attachment. However, it should be understood that when the light correction element is in close contact with the reflective element (e.g., a prism), the surface of the light correction element in contact with the prism is flat, and there is no surface in close contact with the reflective element to form a light correction surface; correspondingly, the light correction element can only correct the light in a single step, which may result in an insignificant correction effect.

[0045] Accordingly, this application further proposes that the optical correction element is spaced apart from the reflective element during installation, so that the surface of the optical correction element facing the reflective element can also be selectively set as a non-planar surface, thereby increasing the number of times the optical correction element corrects the light and improving the correction effect.

[0046] Furthermore, when the reflective element is implemented as a prism, light correction elements are respectively provided on the light-incident side and the light-outcrystal side of the prism. This will further increase the size and weight of the reflective element, thereby increasing the size and weight of the periscope camera module.

[0047] Based on this, this application proposes a light-shifting module, comprising: a reflective element, a first lens, and a second lens. The first lens is located on the light-incident side of the reflective element and is spaced apart from the reflective element; at least one side of the first lens has a non-planar surface shape. The second lens is located on the light-outceasing side of the reflective element and is spaced apart from the reflective element. At least one side of the second lens has a non-planar surface shape. The first lens is used as a light-correcting element located on the light-incident side of the reflective element; the second lens is used as a light-correcting element located on the light-outceasing side of the reflective element; this increases the light intake of the lens module, enabling the periscope camera module to achieve a large aperture without increasing the module height, thereby improving the lens's imaging effect. Furthermore, the spacing between the first lens and the reflective element, and the spacing between the second lens and the reflective element, provide selectivity for the surface shape design of the first lens facing the reflective element and the surface shape design of the second lens facing the reflective element, improving the design flexibility of the surface shape design of the first lens facing the reflective element and the surface shape design of the second lens facing the reflective element.

[0048] After introducing the basic principles of this application, various non-limiting embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0049] Glossary

[0050] For ease of understanding, the technical terms used in this application will be explained and described below.

[0051] 1. Lens: It is a component that uses the refraction principle of a lens to allow light from a scene to pass through and form a clear image on the focal plane.

[0052] 2. Optical axis: The direction in which light rays travel through an optical system, referenced to the principal ray at the center of the field of view. For symmetrical transmission systems, it generally coincides with the rotation center line of the optical system. For off-axis and reflective systems, the optical axis may appear as a broken line.

[0053] 3. Object side and image side: With the lens as the boundary, the side where the object is located is called the object side, and the surface of the lens closest to the object side can be called the object side surface; with the lens as the boundary, the side where the image of the object is located is called the image side, and the surface of the lens closest to the image side can be called the image side surface.

[0054] 4. Focal length: Also known as focal length, it is a measure of the convergence or divergence of light in an optical system. It refers to the distance from the optical center of a lens or lens group to the focal point when a distant object is imaged clearly on the focal plane. It can also be understood as the perpendicular distance from the optical center of the lens or lens group to the focal plane. From a practical perspective, it can be understood as the distance from the center of the lens to the image plane.

[0055] 5. Diaphragm: refers to the edge, frame, or specially designed perforated barrier of an optical element in an optical assembly used to limit the size of an imaging beam or the spatial unit of an imaging beam.

[0056] 6. Aperture: This is a device used to control the amount of light passing through the lens and entering the camera's sensor. It is usually located inside the lens. Aperture size is expressed as F / number.

[0057] 7. Aperture F-number: equal to the lens focal length divided by the entrance pupil diameter. With the lens focal length constant, the larger the entrance pupil diameter, the larger the aperture, the smaller the aperture F-number, the more light enters, the brighter the image, and the greater the blurring of the subject and background; conversely, the smaller the entrance pupil diameter, the smaller the aperture, the larger the aperture F-number, the less light enters, the darker the image, and the sharper the subject and background.

[0058] 8. Total track length (TTL): This refers to the total length from the lens head to the imaging plane, and is the main factor that determines the camera height.

[0059] 9. Sensitivity: The difference between the MTF design value under unit jitter angle and the MTF design value under static conditions.

[0060] 10. MTF (Modulation Transfer Function): A key indicator describing the imaging quality of an optical system.

[0061] Indicative periscope camera module

[0062] like Figures 1 to 4As shown, a periscope camera module 1 according to an embodiment of this application is illustrated, comprising: a light-deflecting module 10, a lens module 20, and a photosensitive module 30. The light-deflecting module 10 is located on the object side of the lens module 20, and the photosensitive module 30 is located on the image side of the lens module 20, such that external light rays R are reflected by the light-deflecting module 10 and then enter the lens module 20, thereby reaching the photosensitive module 30. Correspondingly, the lens module 20 is located on the light-emitting side of the light-deflecting module 10, for receiving light rays R from the light-deflecting module 10; the light-deflecting module 10 is located on the light-incident side of the lens module 20, for reflecting the light rays R before they enter the lens module 20. The light-reflecting module 10 reflects light R from the object being measured from the first direction D1 to the second direction D2; the lens module 20 is positioned along the second direction D2 to receive the light R emitted from the light-reflecting module 10; the photosensitive chip 32 of the photosensitive module 30 is positioned perpendicular to the second direction D2, that is, the photosensitive surface of the photosensitive chip 32 is positioned perpendicular to the second direction D2 to receive the light R emitted from the lens module 20. By folding the optical path through the periscope camera module 1, the total optical length (TTL) is longer, while its own height is smaller.

[0063] The light-incident side of a component refers to the side where light ray R is located when it enters the component; the light-exiting side of a component refers to the side where light ray R is located when it exits the component. For example, the light-exiting side of the light-deflecting module 10 is the side where light ray R exits after being reflected by the light-deflecting module 10, and the light-incident side of the light-deflecting module 10 is the side where light ray R enters the light-deflecting module 10. The light-exiting side of the light-deflecting module 10 is also the light-incident side of the lens module 20; the light-exiting side of the lens module 20 is also the light-incident side of the photosensitive module 30. The light-incident surface of a component refers to the side of the component located on the light-incident side; the light-exiting surface of a component refers to the side of the component located on the light-exiting side.

[0064] The periscope camera module 1 further includes a housing 40 and a base 50. The base 50 is adapted to house the light-deflecting module 10 and the lens module 20. Accordingly, the light-deflecting module 10 and the lens module 20 are mounted on the base 50. The housing 40 is mounted on the base 50. Specifically, the housing 40 covers the base 50 and has a light-entry window 401, which blocks the internal structure of the periscope camera module 1, allowing external light R to enter the periscope camera module 1 through the light-entry window 401. The light-deflecting module 10 is positioned near the light-entry window 401, allowing external light R to enter the periscope camera module 1 along a first direction D1 from the light-entry window 401 and reach the light-deflecting module 10.

[0065] For ease of description, the periscope camera module 1 is defined as extending along a first axis Z, a second axis Y, and a third axis X, which are mutually perpendicular. The periscope camera module 1's width is defined by its extension along the third axis X, its length by its extension along the second axis Y, and its height (thickness) by its extension along the first axis Z. The first direction D1 is parallel to the first axis Z; the second direction D2 is parallel to the second axis Y; and the direction parallel to the third axis X is defined as the third direction D3. Accordingly, the first direction D1 is perpendicular to the second direction D2.

[0066] The light-shifting module 10, the lens module 20, and the photosensitive module 30 are assembled on the base 50 along the second axis Y. The base 50 includes a first space 501, a second space 502, and a third space 503. The first space 501, the second space 502, and the third space 503 are arranged sequentially along the second axis Y. The first space 501, the second space 502, and the third space 503 can be composed of independent components or formed by an integral component; this application does not impose any limitation on this. The first space 501 is adapted to accommodate the light-shifting module 10; the second space 502 is adapted to accommodate the lens module 20. Accordingly, the light-shifting module 10 is installed in the first space 501; the lens module 20 is installed in the second space 502; and the photosensitive module 30 is installed in the third space 503.

[0067] In one embodiment of this application, the base 50 can be an integral structure or a split structure. For example, the base 50 is an integral structure, and the light-shifting module 10 and the lens module 20 are mounted on the base 50; for example, the base 50 is a split structure, and the base 50 includes a first base 51 and a second base 52, with the light-shifting module 10 mounted on the first base 51 and the lens module 20 mounted on the second base 52.

[0068] The light-deflecting module 10 includes a reflective element 11, a first lens 12, and a second lens 13. The first lens 12 is located on the light-incident side of the reflective element 11 and is spaced apart from the reflective element 11; at least one side of the first lens 12 has a non-planar surface shape. The second lens 13 is located on the light-outceasing side of the reflective element 11 and is spaced apart from the reflective element 11. At least one side of the second lens 13 has a non-planar surface shape. The reflective element 11 is configured to deflect light rays R incident along the first direction D1 into light rays R exiting along the second direction D2. The first lens 12 serves as a light-correcting element located on the light-incident side of the reflective element 11; the second lens 13 serves as a light-correcting element located on the light-outceasing side of the reflective element 11. The light-deflecting module 10 can increase the amount of light entering the lens module 20, enabling the periscope camera module 1 to achieve a large aperture while maintaining its height dimension, thereby improving the imaging effect of the periscope camera module 1.

[0069] The spacing between the first lens 12 and the reflecting element 11, and the spacing between the second lens 13 and the reflecting element 11, provide options for the surface design of the first lens 12 facing the reflecting element 11 and the surface design of the second lens 13 facing the reflecting element 11, thereby improving the design flexibility of the surface design of the first lens 12 facing the reflecting element 11 and the surface design of the second lens 13 facing the reflecting element 11.

[0070] It should be understood that, in this application, the separation between the first lens 12 and the reflecting element 11 means that there is a certain gap between the first lens 12 and at least a portion of the reflecting element 11, and does not mean that the first lens 12 and the reflecting element 11 are completely out of contact; the separation between the second lens 13 and the reflecting element 11 means that there is a certain gap between the second lens 13 and at least a portion of the reflecting element 11, and does not mean that the second lens 13 and the reflecting element 11 are completely out of contact.

[0071] Specifically, the first lens 12 is configured to converge the light beam R; the second lens 13 is configured to expand the light beam R, such that the light beam R is incident on the first lens 12 along the first direction D1 and is converged by the first lens 12 before exiting from the first lens 12, reaching the reflecting element 11, and then reflected by the reflecting element 11 before exiting along the second direction D2, reaching the second lens 13, and being expanded by the second lens 13 before exiting.

[0072] This application considers that if the first lens 12 or the second lens 13 can only correct the light ray R once, the correction effect may be insignificant. Therefore, this application proposes that the light-incident and light-exit surfaces of the first lens 12 and the second lens 13 be designed as non-planar, allowing the periscope camera module 1 to perform multiple light corrections on the light ray R on the light-incident or light-exit side of the reflective element 11, thereby improving the correction effect to a certain extent. Thus, the configuration structure and arrangement of the reflective element 11 and the light correction element allow a single light correction element to perform multiple corrections on the light ray R on the light-incident and / or light-exit side of the reflective element 11.

[0073] Accordingly, the first lens 12 has a first lens side surface 121 and a first lens side surface 122, wherein the first lens side surface 121 faces away from the reflecting element 11, and the first lens side surface 122 faces the reflecting element 11; the first lens side surface 121 is configured to converge the light ray R; the first lens side surface 122 is configured to converge the light ray R again. The first lens 12 has positive optical power, and by converging the light ray R multiple times, a larger range of light ray R can enter the first lens 12, thereby increasing the amount of light entering and achieving a large aperture. This means that under the same light ray R conditions, more light ray R can be captured, thereby improving the brightness of the image. Moreover, in low-light environments, increasing the aperture can capture more light ray R, which is particularly important for improving the imaging quality of the periscope camera module 1 under low-light conditions.

[0074] In one embodiment of this application, an aperture stop is provided on the light-incident side of the first lens 12. This way, the size of the aperture stop is not limited by the height of the periscope camera module 1, ensuring that increasing the aperture diameter to increase the light intake of the periscope camera module 1 does not lead to an increase in the height of the periscope camera module 1. In other words, the effective aperture is increased without increasing the height of the periscope camera module 1. In this embodiment, the aperture stop limits the amount of light entering the entire optical system.

[0075] Specifically, one side 121 of the first lens has a convex surface, and the other side 122 of the first lens has a convex surface; that is, the first lens 12 is a lens that is convex on both sides.

[0076] Furthermore, the first lens 12 with double convex surfaces in this application can effectively converge light rays R to a single point. A single convex lens also has positive optical power, but compared to the first lens 12 with double convex surfaces, its focal length may be longer, meaning its focusing effect on light rays R is relatively weaker. Moreover, because both one side 121 and the two side 122 of the first lens have convex surfaces, the first lens 12 with double convex surfaces can refract light rays R twice, generally focusing the light rays R more effectively, allowing a larger range of light rays R to enter the periscope camera module 1. In contrast, a single convex lens, because one side is flat, only refracts light rays R once, and its focusing effect may not be as strong as that of the first lens 12 with double convex surfaces.

[0077] The second lens 13 has a second lens side surface 131 and two lens side surfaces 132, wherein the second lens side surface 131 faces the reflecting element 11, and the second lens side surfaces 132 face away from the reflecting element 11; the second lens side surface 131 is configured to expand the light ray R; the second lens side surfaces 132 are configured to further expand the light ray R. The second lens 13 has negative optical power and can control the emitted light ray R to enter the lens module 20 at an angle approaching parallel to the second direction D2 by expanding the light ray R emitted from the reflecting element 11. It should be understood that "approaching parallel" in this application means that two straight lines are approximately parallel or completely parallel, that is, the case where there is an angle of 0°-5° between two straight lines is also referred to as parallel.

[0078] Specifically, one side 131 of the second lens has a concave surface, and the two sides 132 of the second lens have concave surfaces.

[0079] It should be understood that if the second lens 13 is not provided, the light ray R, after being converged by the first lens 12, reaches the reflecting element 11, and after being reflected at the reflecting element 11, directly reaches the lens module 20. Thus, the light ray R reaching the lens module 20 is still in a converged state. Figure 3As shown; in this case, if the reflective element 11 moves during optical image stabilization, the deflection angles of the light rays R in different directions at the edge will be different. Specifically, because all light rays R converge in the central direction, but during image stabilization, all light rays R will shift in the same direction, resulting in different deflection angles of the light rays R in different directions at the edge after passing through the reflective element 11. This leads to a larger drop in the MTF of the optical system, i.e., higher OIS sensitivity. Here, the MTF can be obtained through optical system simulation. The MTF drop is the difference between the MTF per unit jitter angle and the static MTF design value, and can also be referred to as the optical image stabilizer (OIS) sensitivity.

[0080] like Figure 4 As shown, Figure 4 The path of light ray R is indicated by a dashed line with an arrow. After the second lens 13 is set, the second lens 13 can expand the light ray R, so that the light ray R emitted from the second lens 13 is a light ray R that is close to parallel to the second direction D2. At this time, even if the reflective element 11 moves during OIS operation, these movements have a relatively small impact on the position of light ray R on the lens module 20, because the light ray R has been pre-diffused, and the light ray R emitted from various positions at the edges is closer to parallel light ray R. Therefore, when the reflective element 11 is driven to perform optical image stabilization, the MTF drop value of the optical system is small, that is, the OIS sensitivity is small.

[0081] In other words, when light ray R passes through the light-reflecting module 10, it is first converged by the first lens 12, then reflected by the reflective element 11, and then expanded by the second lens 13 before entering the lens module 20. This helps to reduce the effective optical diameter of the multiple lenses within the lens module 20, thereby reducing the height of the lens module 20, lowering the shoulder height of the lens driving element, and consequently reducing the overall height of the periscope camera module 1. Reducing the shoulder height of the lens driving element means reducing the height space occupied by the shoulder height of the lens driving element within the periscope camera module 1.

[0082] In other words, the periscope camera module 1 relies on the first lens 12 to converge the light beam R, thereby increasing the amount of light entering the camera and achieving a large aperture. The second lens 13 expands the light beam R so that it is incident on the lens module 20 nearly parallel to the second direction D2, minimizing MTF drop and improving the imaging effect of the periscope camera module 1. Furthermore, because the light beam R is converged by the first lens 12, it remains converged after reflection by the reflective element 11. Even after expansion by the second lens 13, the range of the light beam R entering the lens module 20 is smaller than the range entering the first lens 12. This helps to reduce the effective optical diameter of the multiple lenses within the lens module 20, thereby reducing the height of the lens module 20 and lowering the shoulder height of the lens drive element.

[0083] Accordingly, the first lens 12 is further configured such that the light ray R after being focused by it is emitted along a direction intersecting with the first direction D1; the second lens 13 is further configured such that the light ray R after being expanded by it is emitted along a direction that is approximately parallel to the second direction D2.

[0084] It is worth mentioning that, considering that the overall weight and size of the light deflection module 10 will affect the overall weight and size of the periscope camera module 1, and will also affect the driving force and the installation space of the driving components, this application proposes to use a plane mirror as the reflecting element 11, the plane mirror having a reflecting surface 111. Compared to a prism, the plane mirror is lighter, and even the total weight of the plane mirror, the first lens 12, and the second lens 13 is less than the weight of a prism with a reflecting surface 111 of the same size. This allows the periscope camera module 1 to achieve a large aperture while keeping the weight and size of the light deflection module 10 within a certain range, thereby minimizing the increase in the size and weight of the periscope camera module 1 and minimizing the increase in the driving force requirements.

[0085] The reflective surface 111 forms an angle with both the first direction D1 and the second direction D2. Specifically, the angle between the reflective surface 111 and the first direction D1 is 30°-60°, and the angle between the reflective surface 111 and the second direction D2 is also 30°-60°. In one example of this application, the angle between the reflective surface 111 and the first direction D1 is 45°, and the angle between the reflective surface 111 and the second direction D2 is 45°.

[0086] The first lens 12 is disposed along the second direction D2, the second lens 13 is disposed along the first direction D1, and there is also an angle between the reflecting surface 111 of the plane mirror and the first lens 12 and the second lens 13.

[0087] To further reduce the weight of the reflective element 11, the main material of the reflective element 11 may be resin, or other lightweight materials. To meet the high precision requirements of the reflective surface 111, the reflective element 11 can be formed by injection molding.

[0088] To improve imaging quality, a high-reflectivity film layer may optionally be provided on the reflective surface 111. Accordingly, in one embodiment of this application, the light-shifting module 10 further includes a high-reflectivity film layer disposed on the reflective surface 111 of the reflective element 11.

[0089] The light-shifting module 10 further includes a reflective bracket 14 and a driving element for the shifting module. The reflective bracket 14 has a support portion 141, a first mounting portion 142, and a second mounting portion 143. The first mounting portion 142 extends from the support portion 141 towards the light-incident side of the light-shifting module 10; the second mounting portion 143 extends from the support portion 141 towards the light-outceasing side of the light-shifting module 10. The reflective element 11 is mounted on the support portion 141, wherein the support portion 141 has an inclined surface 1411, facilitating the stable arrangement of the reflective element 11 at a specific angle on the support portion 141. The reflective element 11 is mounted on the inclined surface 1411 of the support portion 141. Further, the inclined surface 1411 has a certain angle with the first direction D1, and the reflective surface 111 has a specific angle with the second direction. The first lens 12 is mounted on the first mounting portion 142. The second lens 13 is mounted on the second mounting portion 143. The turning module is configured with a driving element to drive the reflective bracket 14 to move, thereby driving the reflective element 11, the first lens 12 and the second lens 13 to move via the reflective bracket 14, so as to perform optical image stabilization.

[0090] It should be understood that the driving element for the turning module described in this application can be implemented as a voice coil motor (VCM), a shape memory alloy (SMA) motor, a piezoelectric motor, etc., and this application does not limit it.

[0091] The lens module 20 includes multiple lenses and is used to image light rays R onto a focusing plane. The lens module 20 includes a first lens group 21 and a second lens group 22. The first lens group 21 and the second lens group 22 are arranged sequentially from the object side to the image side along the optical axis.

[0092] In one example of this application, the first lens group 21 is a fixed lens group, and the second lens group 22 is a focusing lens group. Accordingly, the first lens group 21 is fixed to the base 50; the second lens group 22 is movably disposed on the base 50. The second lens group 22 can be driven by a lens driving element to move along the optical axis, so as to change the overall optical performance of the periscope camera module 1 by adjusting the relative position of the first lens group 21 and the second lens group 22. At the same time, the relative position of the second lens group 22 and the photosensitive chip 32 can be changed, thereby allowing the imaging mode of the periscope camera module 1 to be switched.

[0093] It should be understood that the lens driving element described in this application can be implemented as a voice coil (VCM) motor, a shape memory alloy (SMA) motor, a piezoelectric motor, etc., and this application does not limit it.

[0094] Specifically, in the periscope camera module 1, by driving the second lens group 22 to move along the optical axis, the periscope camera module 1 can achieve a telephoto imaging mode. When the periscope camera module 1 is in the telephoto imaging mode, the second lens group 22 is farther away from the first lens group 21 and closer to the photosensitive chip 32, and the periscope camera module 1 can capture long-distance objects and obtain clear images.

[0095] In one embodiment of this application, the first lens group 21 includes a first lens barrel and three lenses. The three lenses of the first lens group 21 are housed within the first lens barrel. The three lenses of the first lens group 21 are a third lens, a fourth lens, and a fifth lens arranged sequentially from the object side to the image side along the optical axis. That is, the first lens group 21 includes a first lens barrel, a third lens, a fourth lens, and a fifth lens, and the third lens, the fourth lens, and the fifth lens are housed within the first lens barrel. The centers of the third lens, the fourth lens, and the fifth lens may be located on the optical axis.

[0096] The second lens group 22 includes a second lens barrel and three lenses. The three lenses of the second lens group 22 are housed within the second lens barrel. The three lenses of the second lens group 22 are a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the image side along the optical axis. That is, the second lens group 22 includes a second lens barrel, a sixth lens, a seventh lens, and an eighth lens, and the sixth, seventh, and eighth lenses are housed within the second lens barrel. The centers of the sixth, seventh, and eighth lenses may be located on the optical axis. Of course, the first lens group 21 and the second lens group 22 may also include more or fewer lenses; this application does not impose any limitations on this.

[0097] In one embodiment of this application, the third lens, the fourth lens, and the fifth lens may have positive optical power to correct aberrations. Of course, in other embodiments, the third, fourth, and fifth lenses may have their optical powers allocated in other ways, and this application does not impose any limitations on this.

[0098] In one embodiment of this application, the sixth lens may have negative optical power, the seventh lens may have negative optical power, and the eighth lens may have negative optical power to achieve aberration compensation and focusing. Of course, in other embodiments, the sixth, seventh, and eighth lenses may also have their optical power allocated in other ways, and this application does not impose any limitations on this.

[0099] Furthermore, the surface of each of the third, fourth, fifth, sixth, seventh, and eighth lenses can be an aspherical surface. Aspherical surfaces have better radius of curvature characteristics, which improves distortion aberrations and astigmatism, thereby enhancing image quality. Of course, in other embodiments, other surface types can be selected for each lens as needed; this application does not limit this selection.

[0100] The third, fourth, fifth, sixth, seventh, and eighth lenses can be made of the same or different materials, and this application does not limit this. For example, the third, fourth, fifth, sixth, seventh, and eighth lenses can be made of the same material, so that the optical properties of each lens are similar, thereby helping to reduce the engineering difficulty of optical lens implementation. Optionally, the material of each lens can be any one of resin, plastic, glass, etc.

[0101] It should be noted that the shape, size, thickness, and the degree of concavity and convexity of the object side and image side of the lens described above are merely illustrative and do not impose any limitations on the embodiments of this application.

[0102] The photosensitive module 30 includes a circuit board 31, a photosensitive chip 32, and multiple electronic components 33. The photosensitive chip 32 receives ambient light R collected by the lens module 20, thereby achieving image formation. The photosensitive chip 32 is electrically connected to the circuit board 31 and, through the circuit board 31, is electrically connected to an external mobile electronic device. In one embodiment of this application, the multiple electronic components 33 may be one or more of passive electronic devices such as resistors and capacitors, and active electronic devices such as driver chips and memory chips.

[0103] The photosensitive module 30 further includes a filter assembly 34, which is positioned along the photosensitive path of the photosensitive chip 32. The filter assembly 34 includes a filter element 341, which is also positioned along the photosensitive path of the photosensitive chip 32. The filter element 341 is disposed between the lens module 20 and the photosensitive chip 32 to filter the light R before it enters the photosensitive chip 32, removing unwanted stray light such as infrared light from the light R.

[0104] The filter assembly 34 further includes a filter element bracket 342. The filter element 341 is fixedly mounted on the circuit board 31. In one embodiment of this application, the photosensitive module 30 is fixed to the image side of the lens module 20 via the filter element bracket 342. In another embodiment of this application, the photosensitive module 30 is fixed to the image side of the lens module 20 via the circuit board 31.

[0105] The filter element 341 is fixedly mounted on the filter element bracket 342 and corresponds to the photosensitive area of ​​the photosensitive chip 32. The filter element 341 can be attached to the filter assembly bracket 342 either upright or upside down. The filter element bracket 342 has a light-transmitting hole, which corresponds to the photosensitive area of ​​the photosensitive chip 32, so that light R passing through the lens module 20 enters the photosensitive chip 32 through the light-transmitting hole.

[0106] According to another aspect of this application, a method for assembling a periscope camera module is also proposed. For example... Figure 5As shown, the assembly method of the periscope camera module is explained. Specifically, this application adopts a modular assembly method, that is, the light-shifting module 10, the lens module 20, and the photosensitive module 30 are first assembled independently into separate modules, and then the modules are assembled into one unit to form a highly integrated periscope camera module 1. Through the above-mentioned modular assembly method, the assembly tolerance between the various modules can be reduced.

[0107] Accordingly, the assembly method of the periscope camera module includes the following steps: S110, forming a light-deflecting module 10, a lens module 20 and a photosensitive module 30 respectively; S120, installing the lens module 20 on the light-emitting side of the light-deflecting module 10; and S130, installing the photosensitive module 30 on the light-emitting side of the lens module 20.

[0108] In step S110, the optical switching module 10 is formed using the assembly method of the optical switching module proposed in this application. Specifically, as follows... Figure 6 As shown, the assembly method of the light-deflecting module includes the following steps: S112, mounting a second lens 13 on the light-emitting side of the reflecting element 11, spaced apart from the reflecting element 11, wherein at least one side of the second lens 13 has a non-planar surface shape; and S113, mounting a first lens 12 on the light-incident side of the reflecting element 11, spaced apart from the reflecting element 11, wherein at least one side of the first lens 12 has a non-planar surface shape. The assembly method of the light-deflecting module further includes the step: S111, mounting the reflecting element 11 on the reflecting bracket 14. Specifically, the reflecting element 11 is mounted on the support portion 141 of the reflecting bracket 14.

[0109] In step S112, the second lens 13 is mounted on the light-emitting side of the reflective element 11. Specifically, during the process of mounting the second lens 13 on the light-emitting side of the reflective element 11, after aligning the second lens 13 with the light-emitting side of the reflective element 11, the second lens 13 is bonded and fixed to the reflective bracket 14 using an adhesive medium to form a semi-finished light-shifting module. More specifically, the second lens 13 is fixedly mounted on the second mounting portion 143 of the reflective bracket 14. In step S113, the first lens 12 is mounted on the light-incident side of the reflective element 11. Specifically, in one embodiment of the application, the first lens 12 is mounted on the light-incident side of the reflective element 11 by active calibration. More specifically, before the relative positions of the first lens 12 and the second lens 13 are determined, the first lens 12, the reflective element 11, the second lens 13, the first lens group 21 of the lens module 20, the second lens group 22 of the lens module 20, and the photosensitive chip 32 are arranged sequentially to form a periscope telephoto optical imaging system to be assembled. Then, the photosensitive chip 32 is powered on to obtain the measured telephoto imaging result. Based on the measured telephoto imaging result, the relative positions of the first lens 12 and the semi-finished light-conversion module are calibrated. Finally, based on the actively calibrated relative positions of the first lens 12 and the semi-finished light-conversion module, the first lens 12 is fixed to the reflective bracket 14 using an adhesive medium to form the light-conversion module 10. More specifically, the first lens 12 can be fixedly mounted to the first mounting portion 142 of the reflective bracket 14 through active calibration. It is worth noting that in this embodiment of the application, the first lens 12 and the second lens 13 are installed in different ways. The first lens 12 is installed by active calibration during the installation process; the second lens 13 is not actively calibrated during the installation process.

[0110] It is understandable that during the assembly of multiple components, such as the first lens 12, the reflective element 11, and the second lens 13, assembly tolerances accumulate. Furthermore, tilting or eccentricity may occur during the assembly of the first lens 12 and the second lens 13, affecting the imaging effect. By installing the second lens 13 onto the reflective element 13 and then assembling the first lens 12 through active calibration, the assembly process can compensate for these issues and improve image quality.

[0111] It is worth mentioning that in this embodiment of the application, installing the second lens 13 first, and then installing the first lens 12 through active calibration, simplifies the assembly process. Specifically, the second lens 13 is disposed between the reflective element 11 and the lens module 20, and is constrained by the space between the reflective element 11 and the lens module 20 located on both sides, making its adjustment difficult and inconvenient to finely adjust through active calibration. Furthermore, since the second lens 13 is arranged vertically, i.e., in the first direction D1, when installing the second lens 13 through active calibration, the grippers of the device used to hold the second lens 13 need to be rotated by a certain angle, for example, 90 degrees, making the device more complex. If the first lens 12 is installed first, and then the second lens 13 is installed through active calibration, it will undoubtedly lead to operational inconvenience, increased operational difficulty and complexity, and may also easily affect other components, especially those adjacent to it.

[0112] Since the first lens 12 is located at the front end of the periscope camera module 1, that is, closer to the object being imaged, it is easier for the device to grip and adjust it, achieving a better calibration effect. Therefore, the assembly method of first installing the second lens 13 and then installing the first lens 12 through active calibration is not only simple to operate, but also allows for compensation of the optical system through the active calibration of the first lens 12, which is beneficial for improving the imaging effect.

[0113] In another embodiment of this application, the second lens 13, the first lens 12, and the reflective element 11 are first assembled to form the light-shifting module 10; wherein the installation order of the first lens 12 and the second lens 13 is not limited. During the subsequent assembly of the light-shifting module 10, the lens module 20, and the photosensitive module 30, the positions of the light-shifting module 10, the lens module 20, and the photosensitive module 30 are determined through active calibration, and the assembly of the light-shifting module 10, the lens module 20, and the photosensitive module 30 is achieved. In this assembly method, it is necessary to ensure the assembly accuracy of each of the light-shifting module 10, the lens module 20, and the photosensitive module 30, and then perform active calibration and bonding fixation to improve image quality.

[0114] Accordingly, in this embodiment of the present application, in step S110, the optical switching module 10 is formed by another method of assembling the optical switching module. The other method of assembling the optical switching module includes the following steps:

[0115] The reflective element 11 is mounted on the reflective bracket 14;

[0116] After aligning the second lens 13 with the light-emitting side of the reflector 11, the second lens 13 is fixedly mounted on the reflector bracket 14 using an adhesive medium. More specifically, the second lens 13 is fixedly mounted on the second mounting portion 143 of the reflector bracket 14.

[0117] After aligning the first lens 12 with the light-incident side of the reflective element 11, the first lens 11 is fixedly mounted on the reflective bracket 14 using an adhesive medium. More specifically, the first lens 12 is fixedly mounted on the first mounting portion 142 of the reflective bracket 14 to form the light-deflecting module 10.

[0118] It should be understood that in another method of assembling the optical conversion module, the installation order of the first lens 12 and the second lens 13 is not limited. That is, in one embodiment of this application, the second lens 13 can be assembled to the reflective bracket 14 first, and then the first lens 12 can be assembled to the reflective bracket 14. In another embodiment of this application, the first lens 12 can be assembled to the reflective bracket 14 first, and then the second lens 13 can be assembled to the reflective bracket 14. In yet another embodiment of this application, the first lens 12 and the second lens 13 can be assembled to the reflective bracket 14 simultaneously, and this application does not impose any restrictions on this.

[0119] The assembly method of the optical conversion module further includes the step of: S114, mounting the optical conversion module onto the reflective bracket 14 using a driving element.

[0120] In summary, the optical deflection module 10 and its assembly method, and the periscope camera module 1 and its assembly method according to embodiments of this application have been explained. The periscope camera module 1 employs a specific optical system design, enabling it to achieve a large aperture.

[0121] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. An optical deflection module, characterized in that, include: Reflective element; A first lens is located on the light-incident side of the reflecting element and is spaced apart from the reflecting element; At least one side of the first lens has a non-planar surface shape; as well as The second lens is located on the light-emitting side of the reflecting element and is spaced apart from the reflecting element; at least one side of the second lens has a non-planar surface shape.

2. The optical switching module according to claim 1, wherein, The first lens is configured to converge light rays; the second lens is configured to expand light rays, such that light rays are incident on the first lens in a first direction, converged by the first lens, exit from the first lens, reach the reflecting element, are reflected by the reflecting element, exit in a second direction, reach the second lens, and are expanded by the second lens before exiting.

3. The optical conversion module according to claim 2, wherein, The first lens is further configured such that the light rays after being focused by it are emitted in a direction intersecting with the first direction; the second lens is further configured such that the light rays after being expanded by it are emitted in a direction that is approximately parallel to the second direction.

4. The optical conversion module according to claim 2, wherein, The first lens has a first lens side surface and a first lens side surface, wherein the first lens side surface faces away from the reflecting element, and the first lens side surface faces the reflecting element; the first lens side surface has a convex surface shape, and the first lens side surface has a convex surface shape; the first lens side surface is configured to converge light rays; the first lens side surface is configured to converge light rays again.

5. The optical switching module according to claim 2, wherein, The second lens has one side surface and two side surfaces, wherein the one side surface of the second lens faces the reflecting element, and the two side surfaces of the second lens face away from the reflecting element; the one side surface of the second lens has a concave surface shape, and the two side surfaces of the second lens have a concave surface shape; the one side surface of the second lens is configured to expand the light beam; and the two side surfaces of the second lens are configured to further expand the light beam.

6. The optical switching module according to claim 1, wherein, The reflecting element is a plane mirror, which is configured to convert light rays incident along a first direction into light rays exiting along a second direction. The plane mirror has a reflecting surface, which has a certain angle with the first direction and the second direction. The angle between the reflecting surface and the first direction is 30°-60°, and the angle between the reflecting surface and the second direction is 30°-60°.

7. The optical switching module according to claim 1, wherein, The optical deflection module further includes a reflective bracket and a driving element for the deflection module. The reflective bracket has a support portion, a first mounting portion, and a second mounting portion. The first mounting portion extends from the support portion toward the light-incident side of the optical deflection module; the second mounting portion extends from the support portion toward the light-outceasing side of the optical deflection module; the reflective element is mounted on the support portion; the first lens is mounted on the first mounting portion; the second lens is mounted on the second mounting portion; the driving element for the deflection module is configured to drive the reflective bracket to move, thereby moving the reflective element, the first lens, and the second lens through the reflective bracket to perform optical image stabilization.

8. A periscope camera module, characterized in that, include: The optical switching module as described in any one of claims 1 to 7; A lens module, located on the light-emitting side of the light-deflecting module, is used to receive light from the light-deflecting module; as well as A photosensitive module, located on the light-emitting side of the lens module, is used to receive light from the lens module.

9. A method for assembling an optical transition module, characterized in that, Including the following steps: A second lens is mounted on the light-emitting side of the reflecting element and spaced apart from the reflecting element, wherein at least one side of the second lens has a non-planar surface type; and A first lens is mounted on the light-incident side of the reflecting element and spaced apart from the reflecting element, wherein at least one side of the first lens has a non-planar surface.

10. The assembly method of the optical transition module according to claim 9, wherein, Before mounting the second lens on the light-emitting side of the reflective element, the assembly method of the light deflection module further includes the step of mounting the reflective element on the reflective bracket; During the process of installing the second lens on the light-emitting side of the reflective element, after aligning the second lens with the light-emitting side of the reflective element, the second lens is fixedly placed on the reflective bracket by an adhesive medium to form a semi-finished light-converting module. During the process of installing the first lens on the light-incident side of the reflective element, the relative position of the first lens and the semi-finished light-deflecting module is determined by active calibration. Based on the relative position after active calibration, the first lens is fixedly placed on the reflective bracket by an adhesive medium to form the light-deflecting module.

Images