Light path conversion structure, camera module and electronic equipment

Abstract

The utility model discloses a light path conversion structure, a camera module and electronic equipment, and the structure comprises a plastic prism which is provided with a reflection side used for refracting and reflecting light, the surface of the reflection side is a reflection surface, and the surface precision of the plastic prism is a first numerical value; the surface precision of the reflecting glass is a second numerical value, the second numerical value is smaller than the first numerical value, and the reflecting glass is glued to the reflecting surface so as to enhance the reflectivity of the light path conversion structure; wherein light rays penetrating through the reflection side are emitted to the reflection glass in the first direction, are reflected to the second direction by the reflection glass and then are emitted to the reflection side, and the second direction intersects with the first direction.

Description

Technical Field

[0001] This application belongs to the field of photography technology, specifically relating to a camera module and electronic device with an optical path conversion structure. Background Technology

[0002] Currently, periscope lens modules are becoming increasingly important in the photography functions of electronic devices. To improve the photography effect of periscope lens modules, related technologies are designing periscope lens apertures to be larger and larger, and the size of periscope lenses is also increasing. Moreover, periscope lens modules are now quite diverse, with more than one glass prism in a single periscope lens module, and the structures of the glass prisms are also diverse.

[0003] However, in the process of implementing this application, the applicant discovered that the prior art has at least the following problems: the periscope lens is relatively heavy, and the motor thrust required to achieve the image stabilization function is relatively high, which results in the periscope lens module having a high module weight and power consumption, posing a serious challenge to the lightweighting and low power consumption of the camera module. Utility Model Content

[0004] This application aims to provide an optical path conversion structure, a camera module, and an electronic device to solve the problems of high module weight and power consumption in periscope lens modules.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application propose an optical path conversion structure, including:

[0007] A plastic prism has a reflective side for refracting and reflecting light rays, the surface of the reflective side being a reflective surface, and the surface accuracy of the plastic prism is a first value;

[0008] The reflective glass has a surface accuracy of a second value, which is less than the first value. The reflective glass is bonded to the reflective side to enhance the reflectivity of the light path conversion structure. Light rays transmitted from the reflective side are incident on the reflective glass along a first direction, reflected by the reflective glass to a second direction, and then incident on the reflective side. The second direction intersects with the first direction.

[0009] Secondly, embodiments of this application propose a camera module, including a lens group and the aforementioned optical path conversion structure;

[0010] The object side of the lens group is provided with at least one of the optical path conversion structures, and / or the image side of the lens group is provided with at least one of the optical path conversion structures.

[0011] Thirdly, embodiments of this application propose an electronic device, including:

[0012] case;

[0013] A camera module, wherein the camera module is as described above, and the camera module is assembled in the housing.

[0014] In the embodiments of this application, the optical path conversion structure includes a bonded reflective glass and a plastic prism. Because plastic material has a low density, the weight of the plastic prism can be designed to be relatively small, facilitating a reduction in the weight of the optical path conversion structure. Thus, when the optical path conversion structure is applied to a camera module, it can achieve lightweighting and low power consumption. Furthermore, since the surface accuracy of the plastic prism is a first value and the surface accuracy of the reflective glass is a second value (the second value being greater than the first value), bonding the reflective glass to the reflective surface of the plastic prism can enhance the reflectivity of the optical path conversion structure, improving the light reflection effect and optical performance of the structure, thereby ensuring the imaging quality of the camera module.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is an exploded view of the optical path conversion structure according to an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the structure of a plastic prism according to an embodiment of this application;

[0019] Figure 3 This is a top view of a plastic prism according to an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of an optical path conversion structure of a prism according to an embodiment of this application;

[0021] Figure 5 This is a schematic diagram of an optical path conversion structure of an isosceles trapezoidal prism according to an embodiment of this application;

[0022] Figure 6 This is a schematic diagram of the structure of an optical system according to an embodiment of this application;

[0023] Figure 7 This is a schematic diagram of the structure of another optical system according to an embodiment of this application;

[0024] Figure 8 This is an embodiment of the present application. Figure 7 Top view of the optical system in the image;

[0025] Figure 9 This is a schematic diagram of axial color difference according to an embodiment of this application;

[0026] Figure 10 This is a schematic diagram of a defocused MTF according to an embodiment of this application.

[0027] Figure label:

[0028] 10. Optical path conversion structure; 11. Plastic prism; 111. Light-incident side; 112. Light-out side; 113. Reflecting side; 12. Reflective glass; 13. Optical adhesive; 20. Lens group; 21. Lens; 30. Filter; 40. Photosensitive chip. Detailed Implementation

[0029] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] The following is combined Figures 1-10 This application describes the optical path conversion structure 10, the camera module, and the electronic device according to embodiments of the present application.

[0034] like Figure 1 As shown, according to some embodiments of this application, the optical conversion structure includes: a plastic prism 11 having a reflective side 113 for reflecting light rays, the surface of the reflective side 113 being a reflective surface, and the surface accuracy of the plastic prism 11 being a first value; and a reflective glass 12 having a surface accuracy of a second value, wherein the second value is less than the first value, that is, the surface accuracy of the reflective glass 12 is less than the surface accuracy of the plastic prism 11, or in other words, the surface accuracy of the reflective glass 12 is better than that of the plastic prism 11. The reflective glass 12 is bonded to the reflective side 113 to enhance the reflectivity of the optical path conversion structure 10; wherein light rays transmitted from the reflective side 113 are incident on the reflective glass 12 along a first direction, reflected by the reflective glass 12 to a second direction, and then incident on the reflective side 113, the second direction intersecting the first direction.

[0035] In the embodiments of this application, the optical path conversion structure 10 includes a bonded reflective glass 12 and a plastic prism 11. Because the plastic material has a low density, the weight of the plastic prism 11 can be designed to be relatively small, thereby facilitating a reduction in the weight of the optical path conversion structure 10. Thus, when the optical path conversion structure 10 is applied to a camera module, it can achieve lightweighting and low power consumption of the camera module. Furthermore, since the surface accuracy of the plastic prism 11 is a first value, and the surface accuracy of the reflective glass 12 is a second value (the second value being greater than the first value), bonding the reflective glass 12 to the reflective surface of the plastic prism 11 can enhance the reflectivity of the optical path conversion structure 10, thereby improving the light reflection effect of the optical path conversion structure 10, enhancing the optical performance of the optical path conversion structure 10, and ensuring the imaging quality of the camera module.

[0036] The optical path conversion structure 10 described in this embodiment is an important optical element that can be applied in camera modules as well as in other scenarios, such as lighting systems. The optical path conversion structure 10 can change the direction of light propagation through the principles of refraction and reflection, allowing the camera module or lighting system to achieve a specific optical layout within a limited space. Taking the application of the optical path conversion structure 10 in a camera module as an example, it can correct the image orientation to ensure that the captured image has the correct orientation when displayed or stored, or help optimize light propagation and focusing, reducing optical defects such as aberrations and chromatic aberrations, thereby improving image clarity, contrast, and color reproduction.

[0037] Specifically, the optical path conversion structure 10 includes a plastic prism 11, which can be made of resin or polymethyl methacrylate (PMMA), etc., and has good optical transparency and processing performance, and is lightweight, which is conducive to the lightweighting of the optical path conversion structure 10. Thus, when the optical path conversion structure 10 is applied in the camera module, it helps to reduce the weight of the camera module, thereby reducing the thrust required for the image stabilization function and reducing losses.

[0038] Specifically, the plastic prism 11 may include at least one reflecting side 113. For example, when the plastic prism 11 includes one reflecting side 113, light can be reflected by the plastic prism 11 at least once; when the plastic prism 11 includes two reflecting sides 113, light can be reflected by the plastic prism 11 at least twice. The specific number of reflecting sides 113 is not limited in the embodiments of this application.

[0039] Specifically, the reflective side 113 of the plastic prism 11 can be used to refract light rays to change the direction of light propagation, wherein the light rays can undergo reflection on the reflective side 113. Specifically, the plastic prism 11 also has an incident side 111 and an exiting side 112. Light rays can enter the plastic prism 11 from the incident side 111 and then exit from the exiting side 112. In some embodiments, the reflective side 113 and the exiting side 112 are independently provided, that is, the reflective side 113 is only used to refract light rays, and the exiting side 112 is only used to exit light rays. In other embodiments, one of the reflective sides 113 can serve both to reflect and exit light rays, that is, the reflective side 113 and the exiting side 112 are integrated on one side. In this case, this side can be bonded with reflective glass 12 to ensure the light reflection effect of the light path conversion structure 10.

[0040] Specifically, the manufacturing process of the plastic prism 11 is simple, and the surface of the plastic prism 11 can be easily made into various surface contour structures such as spherical, aspherical, and free-form surfaces. For example, the surface of the light-incident side 111 of the plastic prism 11 can be made aspherical, and the surface of the light-exiting side 112 of the plastic prism 11 can be made spherical, etc.

[0041] Specifically, the surface of the reflective side 113 is a reflective surface, and the light path conversion structure 10 also includes a reflective glass 12. The reflective glass 12 can be glued to the reflective surface of the reflective side 113, so that light passing through the reflective side 113 can be reflected by the reflective glass 12. Specifically, light refracted from the reflective side 113 of the plastic prism 11 travels along a first direction to the reflective glass 12, is reflected by the reflective glass 12, travels along a second direction to the reflective side 113, is refracted by the reflective side 113, enters the plastic prism 11, and then exits from the light-emitting side 112. The first direction and the second direction form an angle, which can be 90 degrees, greater than 90 degrees, or less than 90 degrees, etc.

[0042] Furthermore, the reflective glass 12 can be bonded to the reflective surface of the reflective side 113 using adhesive, and the reflective glass 12 can be configured in a one-to-one correspondence with the reflective side 113. The reflective glass 12 is made of glass, which facilitates the processing to achieve good surface accuracy. The surface accuracy of the reflective glass 12 can be a second value, which can be less than or equal to 1 / 6λ, resulting in better flatness of the reflective glass 12 and the ability to reflect more light. The surface accuracy of the plastic prism 11 is a first value, and the second value is less than the first value. The refractive index of the reflective glass 12 is greater than that of the plastic prism 11, so light not reflected by the reflective side 113 can be reflected by the reflective glass 12. Bonding the reflective glass 12 to the emitting surface can enhance the light reflection effect of the light path conversion structure 10, thereby improving the optical performance of the light path conversion structure 10 and ensuring image quality.

[0043] Specifically, the reflective glass 12 is made of glass with a surface accuracy of a second value, which can be less than or equal to 1 / 6λ. It has good flatness and can achieve total internal reflection of light. Furthermore, the second value can reach 1 / 6λ to 1 / 10λ, and even less than 1 / 10λ. The second value can be 1 / 6λ, 1 / 7λ, 1 / 9λ, 1 / 10λ, 1 / 11λ, etc.

[0044] Specifically, when light shines on the surface of an optical element, if the reflecting surface is uneven, it will cause the optical path of the reflected light to change, resulting in the movement or deformation of interference fringes. Alternatively, surface shape errors of the reflecting surface can cause light diffraction, affecting the resolution and accuracy of the photolithographic pattern. Surface shape accuracy is usually measured by the ratio of wavelength (λ). For example, 1 / 6λ, or λ / 6, means that the peak and valley values ​​of the surface shape do not exceed one-sixth of the wavelength. The smaller this value, the smaller the deviation of the surface shape from the ideal surface shape, the smaller the surface undulation, and the smoother the surface.

[0045] In this embodiment, the refractive index of the reflective glass 12 is much greater than that of the plastic prism 11. Light entering from the incident side 111 of the plastic prism 11, light that cannot be reflected at the reflecting side 113, can pass through the reflecting side 113 and be reflected by the reflective glass 12, then exit from the emitting side 112 of the plastic prism 11. In this embodiment, the light path conversion structure 10 combines the plastic prism 11 and the reflective glass 12, which reduces the weight of the light path conversion structure 10 while effectively ensuring the light reflection effect of the light path conversion structure 10.

[0046] In some alternative embodiments, the reflective glass 12 is bonded to the reflective surface of the reflective side 113 by optical adhesive 13, and the difference between the refractive index of the optical adhesive 13 and the refractive index of the plastic prism 11 is less than or equal to a first threshold. The first threshold can be determined specifically according to the application scenario and is not limited here.

[0047] In this embodiment, when the refractive index of the optical adhesive 13 is designed to be less than or equal to the refractive index of the plastic prism 11, it can be considered that the refractive index of the optical adhesive 13 is similar to that of the plastic prism 11, or that the difference between the refractive index of the optical adhesive 13 and the refractive index of the plastic prism 11 meets the design requirements. In this way, when light shines from the plastic prism 11 to the optical adhesive 13, the reflection of light can be reduced, thereby reducing light energy loss and improving the efficiency of the optical system.

[0048] Specifically, the material of the optical adhesive 13 and the plastic prism 11 may be the same or different, and this application embodiment does not make specific limitations on this.

[0049] In other embodiments, the refractive index of the optical adhesive 13 may be designed to be greater than a first threshold than the refractive index of the plastic prism 11, that is, the refractive index of the optical adhesive 13 and the refractive index of the plastic prism 11 are significantly different.

[0050] In some alternative embodiments, a reflective film may be provided on the side of the reflective glass 12 away from the reflective surface. By utilizing the principle of light interference, light of a specific wavelength will interfere between the film layers, thereby enhancing the intensity of the reflected light of the optical path conversion structure 10, reducing the reflection loss of light on the surface of the medium, thereby enhancing the reflectivity of the reflective glass 12 and improving the optical performance of the optical path conversion structure 10.

[0051] Specifically, one side of the reflective glass 12 is bonded to the reflective surface of the plastic prism 11 using optical adhesive 13, while the other side is coated with a reflective film. Thus, after light passes through the reflective surface of the plastic prism 11, it passes through the adhesive layer, is reflected on the reflective glass 12, and then exits from the light-emitting side 112 of the plastic prism 11. The reflective film is coated on the reflective glass 12 and integrated with it. The bonding of the reflective glass 12 to the reflective surface of the plastic prism 11 makes them an integrated unit. The optical path conversion structure 10 is a single, lightweight structure. The surface accuracy of the reflective surface is a second value, which can be less than or equal to 1 / 6λ, satisfying the optical performance requirements of the optical path conversion structure 10.

[0052] In some optional embodiments, the coverage area of ​​the optical adhesive 13 on the reflective surface is S1, and the effective light-transmitting area on the reflective surface for light transmission is S2. The relationship between the coverage area S1 of the optical adhesive 13 on the reflective surface and the effective light-transmitting area S2 on the reflective surface satisfies: S1≥S2.

[0053] In this embodiment, the coverage area of ​​the optical adhesive 13 on the reflective surface is S1. Light transmitted through the effective light-transmitting area on the reflective surface can be directed toward the reflective glass 12 and reflected by the reflective glass 12, and enter the plastic prism 11 from the effective light-transmitting area on the reflective surface. The effective light-transmitting area of ​​the effective light-transmitting area on the reflective surface is S2.

[0054] Specifically, by adjusting S1≥S2, the optical adhesive 13 can fully cover the effective light-transmitting area of ​​the reflective surface. In this way, the light transmitted from the reflective side 113 can be directly reflected by the reflective glass 12 through the optical adhesive 13, which can avoid light scattering and refraction caused by air gaps, thereby reducing light energy loss and improving the efficiency of the optical system.

[0055] Specifically, the area covered by the optical adhesive 13 on the reflective surface does not exceed the edge of the optical adhesive 13, which can prevent the optical adhesive 13 from overflowing the reflective surface. On the one hand, this can reduce the waste of the optical adhesive 13, and on the other hand, it can also prevent excessive optical adhesive 13 from overflowing the reflective surface and causing other appearance or stray light problems, thus ensuring the optical performance of the plastic prism 11 and the reflective glass 12.

[0056] Specifically, in optical software, taking the central field of view ray as an example, the ray is reflected at the reflecting surface, forming an effective optical area on the reflecting surface. Specifically, for example... Figure 2 and Figure 3 As shown, a is the effective light-transmitting area of ​​the incident light side 111, and b is the effective light-transmitting area of ​​the reflecting surface.

[0057] Specifically, the required amount of optical adhesive 13 can be obtained by calculating the thickness of the optical adhesive 13 after bonding, so as to ensure that the coverage area of ​​the optical adhesive 13 on the reflective surface after extrusion is greater than the effective light-transmitting area on the reflective surface, and at the same time, the optical adhesive 13 will not overflow the reflective surface.

[0058] In the design, the amount of optical adhesive 13 used = design volume * optical adhesive 13 density * equipment loss coefficient. Wherein, the design volume is the theoretical volume of adhesive calculated based on the theoretical length, height and width of the optical adhesive 13; the optical adhesive 13 density is the theoretical density of the optical adhesive 13 to be used; the equipment loss coefficient is the difference coefficient between the theoretical dispensing amount and the actual dispensing amount of the dispensing equipment. Based on the above, the amount of optical adhesive 13 required for different sizes of optical effective area is obtained.

[0059] In some alternative embodiments, the plastic prism 11 includes at least three circumferentially connected side surfaces, at least one of which is a reflecting surface located on the reflecting side 113.

[0060] In this embodiment, the plastic prism 11 includes at least three circumferentially connected sides, making the structure of the plastic prism 11 more diverse.

[0061] Specifically, such as Figure 4 As shown, when the plastic prism 11 includes three circumferentially connected sides, the optical path conversion structure 10 can be in the shape of a triangular prism, such as an isosceles right-angle prism or a right-angle prism containing 30 degrees; for example... Figure 5 As shown, when the plastic prism 11 includes four circumferentially connected sides, the light path conversion structure 10 can be in the shape of a quadrilateral prism, such as an isosceles trapezoidal prism; when the plastic prism 11 includes five circumferentially connected sides, the light path conversion structure 10 can be in the shape of a pentagonal prism.

[0062] Specifically, the surface of the light-incident side 111 is the light-incident surface, and the surface of the light-exiting side 112 is the light-exiting surface. When the plastic prism 11 includes three circumferentially connected side surfaces, such as... Figure 4 As shown, one side is the light-incident surface, one side is the light-exit surface, and one side is the reflective surface. Figure 5 As shown, when the plastic prism 11 includes four circumferentially connected sides, one side is the light-incident surface, one side is the light-exit surface, and two sides are the reflecting surfaces. When the plastic prism 11 includes five circumferentially connected sides, one side is the light-incident surface, one side is the light-exit surface, and three sides are the reflecting surfaces.

[0063] In some optional embodiments, the surface of the light-incident side 111 is a light-incident surface, which includes one of a plane, a spherical surface, and an aspherical surface; the surface of the light-exiting side 112 is a light-exiting surface, which includes one of a plane, a spherical surface, and an aspherical surface.

[0064] In this embodiment, the incident surface includes one of a plane, a sphere, and an aspherical surface, allowing incident light to be incident on the optical path conversion structure 10 in various forms, thereby increasing the structural diversity of the optical path conversion structure 10. The exiting surface includes one of a plane, a sphere, and an aspherical surface, allowing exiting light to exit the optical path conversion structure 10 in various forms, thereby increasing the structural diversity of the optical path conversion structure 10.

[0065] Specifically, the incident surface can be a plane, meaning the object-side surface of the light path conversion structure 10 is flat, making the propagation direction of the incident light more regular, suitable for applications requiring precise optical control. Alternatively, the incident surface can be concave, meaning the object-side surface of the light path conversion structure 10 is concave, causing incident rays parallel to the principal optical axis to diverge before entering the light path conversion structure 10, increasing the complexity of the light propagation direction, suitable for optical systems that require pre-divergence processing of light, such as illumination systems that need to expand the beam illumination range. Or, the incident surface can be convex, meaning the object-side surface of the light path conversion structure 10 is convex, causing incident rays parallel to the principal optical axis to converge before entering the light path conversion structure 10, suitable for optical systems that require pre-convergence processing of light.

[0066] Specifically, the light-emitting surface can be a plane, meaning the image-side surface of the light path conversion structure 10 is flat, allowing light to exit in a relatively regular direction, suitable for applications requiring precise optical control. Alternatively, the light-incident surface can be concave, meaning the image-side surface of the light path conversion structure 10 is concave, causing the emitted light to diverge, suitable for optical applications requiring expanded light coverage or scattering effects. Or, the light-incident surface can be convex, meaning the image-side surface of the light path conversion structure 10 is convex, causing the emitted light to converge, suitable for optical systems requiring focused light to a specific location.

[0067] Specifically, when the light-emitting surface is flat, it can also be used to refract and reflect light rays, and be integrated with the reflecting surface; when the light-emitting surface is concave or convex, it can be used only as a light-emitting surface.

[0068] The optical path conversion structure described in this application embodiment has at least the following advantages:

[0069] In the embodiments of this application, the optical path conversion structure includes a bonded reflective glass and a plastic prism. Because the plastic material has a low density, the weight of the plastic prism can be designed to be relatively small, facilitating a reduction in the weight of the optical path conversion structure and achieving lightweighting and low power consumption of the camera module. Furthermore, since the surface accuracy of the plastic prism is a first value and the surface accuracy of the reflective glass is a second value (the second value being greater than the first value), bonding the reflective glass to the reflective surface of the plastic prism can enhance the reflectivity of the optical path conversion structure, thereby improving the light reflection effect of the optical path conversion structure, enhancing its optical performance, and ensuring the imaging quality of the camera module.

[0070] Secondly, embodiments of this application also disclose a camera module, such as... Figures 6 to 8 As shown, the camera module includes a lens group 20 and the aforementioned optical path conversion structure 10; at least one optical path conversion structure 10 is provided on the object side of the lens group 20, and / or at least one optical path conversion structure 10 is provided on the image side of the lens group 20.

[0071] In this embodiment, the optical path conversion structure 10 includes a laminated reflective glass 12 and a plastic prism 11. Because the plastic material has a low density, the plastic prism 11 is lightweight, thus reducing the weight of the optical path conversion structure 10 and achieving lightweighting and low power consumption of the camera module. Furthermore, adding the optical path conversion structure 10 to the object side or image side of the lens group 20 allows for folding of the lens's optical path, accommodating a longer focal length lens within a limited space. This enables the camera module to achieve higher optical zoom, allowing users to clearly capture distant objects, such as distant landscapes, wildlife, or sporting events, clearly presenting distant details.

[0072] Specifically, by using the optical path conversion structure 10 and the lens group 20 together, the camera module can realize the function of a periscope camera. By adopting a folded optical path design, the telephoto lens module is compactly arranged inside the body, which effectively reduces the space occupied by the camera module in the thickness direction of the body. This allows the electronic device to maintain a relatively thin and light appearance while having telephoto capabilities, thus improving the portability and aesthetics of the electronic device.

[0073] Specifically, the combination of the reflective glass 12 and the plastic prism 11 allows the surface accuracy of the reflective surface of the optical path conversion structure 10 to reach a third value, ranging from 1 / 6λ to 1 / 10λ, or even less than 1 / 10λ. This enhances the modulation transfer function (MTF) performance of the optical path conversion structure 10 within the optical system, thereby improving its optical performance. MTF represents the ability of an optical system to transfer sinusoidal intensity distributions at different spatial frequencies. Simply put, it describes how an optical system accurately images detailed information of an object onto the image plane.

[0074] Specifically, the camera module has an optical system, which may include a lens group 20, a filter 30 and a photosensitive chip 40 arranged in sequence. The optical system also includes a front reflector and / or a rear reflector. After the light passes through the front reflector, the lens group 20, the rear reflector and the filter 30 in sequence, it is transmitted to the photosensitive chip 40 for imaging.

[0075] The function of both the front and rear reflectors is to adjust the angle of light. The front and / or rear reflectors can employ a light path conversion structure 10. The front reflector can be located on the object side of the lens group 20, and the rear reflector can be located on the image side of the lens group 20. The side of the lens group 20 where the subject is located is the object side, i.e., the object side is the light-incident side 111 of the lens group 20, and light enters the lens group 20 from the object side. The side of the lens group 20 where the image of the subject is located is the image side, i.e., the image side is the light-exit side 112 of the lens group 20, and light exits the lens group 20 from the image side.

[0076] Specifically, the front or rear reflector can be combined with a motor or other devices to form a stabilization assembly, thereby enabling the camera module to have stabilization functionality.

[0077] Specifically, the filter 30 can be disposed between the image side of the lens group 20 and the photosensitive chip 40 to filter stray light passing through the lens group 20 and improve the imaging effect of the photosensitive chip 40. Alternatively, the filter 30 can also be disposed on the object side of the lens group 20 to filter stray light entering the lens group 20 and improve the imaging effect of the photosensitive chip 40.

[0078] Specifically, the filter 30 can filter out infrared light, allowing the photosensitive chip 40 to more accurately capture and reproduce image colors within the visible light range. The substrate of the filter 30 can be flat glass, and the surface of the flat glass can be coated with an AR anti-reflection film and an IR cut-off film to filter near-infrared light, thereby enabling the filter 30 to filter out infrared light.

[0079] Specifically, the photosensitive chip 40 has an imaging surface, which acts as a light receiver. Object-side light rays are refracted by the lens group 20 and then imaged onto the photosensitive chip 40. The photosensitive chip 40 may include one of complementary metal-oxide-semiconductor (CMOS) and charge-coupled device (CCD).

[0080] Optionally, the front reflector can have positive focal length, the focal length of the front reflector is f1, and the focal length of the optical system is ef1. The focal lengths of the front reflector and the optical system satisfy the following: f1 > ef1, and ef1 > 13.3 mm, so that the camera module can achieve the function of long focal length.

[0081] Specifically, the focal length efl of an optical system is a measure of the system's ability to focus or disperse light. It refers to the perpendicular distance from the optical center of lens 21 or lens group 20 to the focal plane when a distant object is imaged clearly on the focal plane through lens 21 or lens group 20. From a practical perspective, it can be understood as the distance from the center of the lens (lens group 20) to the imaging plane.

[0082] Specifically, lens group 20 has a field of view (FOV) and a half field of view. The field of view is the angle formed by the two edges of the lens group 20 at which the image of the subject can pass through the lens group 20 to its maximum extent. The size of the field of view determines the field of view range of the lens group 20; the larger the field of view, the wider the field of view. The half field of view (HFOV) refers to half of the field of view.

[0083] Specifically, lens group 20 also has an aperture, which is a device used to control the amount of light passing through lens group 20 and entering the electronic device. Typically, within lens group 20, the aperture size is expressed using the F# value. The aperture number F# is a relative value derived from the focal length of lens group 20 divided by the light-gathering diameter of lens group 20 (the reciprocal of the relative aperture). The smaller the F# value, the more light enters in the same unit of time, resulting in a shallower depth of field and blurred background content, producing an effect similar to that of a telephoto lens group 20.

[0084] Optionally, the lens group 20 may contain at least three lenses 21. For example, the lens group 20 may contain three, four, five, or six lenses 21, etc.

[0085] In some alternative embodiments, the lens group 20 includes a plurality of lenses 21 arranged sequentially along its optical axis; along the direction from the object side to the image side of the lens group 20, the lens 21 located at the first end is a first lens, the first lens has positive optical power, and the object side of the first lens is convex.

[0086] In this embodiment, the first lens has positive optical power, which enables the first lens to converge light rays. It can accurately refract and converge light rays, allowing the light rays of distant objects to be imaged within a limited space, thus meeting the requirements of the camera module for telephoto imaging.

[0087] Specifically, optical power characterizes the refractive power of lens 21 for incident parallel light beams. The first lens possesses positive optical power and can be used in conjunction with other lenses 21 with different optical properties to correct various aberrations and chromatic aberrations through a carefully designed lens group 20. The first lens can precisely control light according to design requirements, contributing to improved optical performance such as resolution, contrast, and light transmittance of the lens.

[0088] Optionally, the lens group 20 may include at least two lenses 21 with positive optical power, one of which is a first lens, to further ensure that the requirements of the periscope telephoto lens for telephoto imaging can be met.

[0089] Optionally, the Abbe number Vd1 of the first lens satisfies Vd1>50, which makes the focusing ability of the first lens more consistent for different colors of light, reduces the influence of chromatic aberration, and thus improves the image quality.

[0090] Specifically, the Abbe number is an indicator used to measure the degree of dispersion of the material of lens 21. The larger the Abbe number, the smaller the dispersion of the material, that is, the smaller the difference in the angle of refraction when light of different wavelengths propagates in lens 21.

[0091] Optionally, the lens group 20 may include at least one second lens having negative optical power.

[0092] In this embodiment, the second lens and the first lens are combined to ensure the optical performance of the camera module.

[0093] Optionally, the Abbe number Vd2 of the second lens satisfies Vd2 < 40, which makes the refractive index of the second lens larger, making it easier to achieve a larger optical power and helping to reduce the size of the camera module.

[0094] Specifically, along the direction from the object side to the image side of the lens group 20, the first lens is located at the beginning end, and the second lens can be located after the first lens, in the middle, or at the end, etc., but this application embodiment does not make specific limitations on this.

[0095] In some alternative embodiments, the lens group 20 includes a plurality of lenses 21 arranged sequentially along its optical axis; at least some of the lenses 21 are adjustable in position along the optical axis of the lens group 20.

[0096] In this embodiment, at least some of the lenses 21 are adjustable in the optical axis direction of the lens group 20, so that the camera module can achieve focusing function.

[0097] Specifically, the lens group 20 can be divided into two groups. In one group, the lens 21 is fixed in position, while in the other group, the lens 21 can move along the optical axis of the lens group 20 to achieve focusing. Alternatively, the lens group 20 can be a single unit that is movable along its optical axis.

[0098] Specifically, when focusing at a distance, lens 21 moves towards the image side; when focusing at a close distance, lens 21 moves towards the object side.

[0099] Optionally, the surface profile of lens 21 can be an even-order aspherical surface, and the shape of the aspherical surface satisfies the formula:

[0100]

[0101] Where, parameter c = 1 / R, which is the curvature corresponding to the radius, i.e., c is the curvature of the target point, and R is the radius of curvature at the target point; r is the perpendicular distance from the target point on the aspherical surface to the optical axis of lens group 20; z represents the sag of the target point along the optical axis of lens group 20; k is the quadratic surface coefficient of the aspherical surface, A i Let r represent the i-th order aspherical coefficient. i As a higher-order term, its function is to fine-tune the shape of the aspherical surface to make it closer to the design requirements.

[0102] The following is an example of a specific embodiment, such as... Figure 7 and Figure 8 As shown, the optical system of the camera module includes a light path conversion structure 10, a lens group 20, a filter element 30, and a photosensitive chip 40 arranged sequentially. The shape of the light path conversion structure 10 is an isosceles right-angled triangular prism. Since the light path conversion structure 10 uses reflective glass 12 bonded to the reflective surface of the plastic prism 11, the weight can be reduced by about 70% compared to a glass prism. Moreover, under the action of the reflective glass 12, the surface shape of the reflective surface of the light path conversion structure 10 meets the requirements, which can improve the performance of the optical system of the camera module and reduce power consumption.

[0103] like Figure 7 and Figure 8 As shown, the lens group 20 includes three aspherical lenses 21, arranged sequentially from the object side to the image side as lens a1, lens a2, and lens a3. Lens a1 is the first lens, with positive optical power, a convex object side, and an Abbe number Vd1 > 60; lens a2 is the second lens, with negative optical power, a concave image side, and an Abbe number Vd2 < 35; lens a3 has positive optical power, a concave object side, and a convex image side. Basic specifications are shown in Table 1-1 below.

[0104] efl F# FOV L 13.3mm 2.57 33.3° 13.3mm

[0105] Where ef l is the system focal length, F# is the system aperture, DFOV is the field of view, and L is the length of the light rays from the optical system along the optical axis after being reflected back through the plastic prism.

[0106] Table 1-2 shows the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens 21 in the optical system of the embodiment;

[0107]

[0108]

[0109] Table 1-3 provides the aspherical higher-order term coefficients for each lens surface in the embodiments;

[0110] Surface number K A4 A6 A8 A10 A12 A14 A16 S1 -6.20E-03 -2.94E-04 -1.57E-04 -2.48E-04 6.46E-04 -7.37E-04 5.14E-04 -2.41E-04 S2 -4.19E+01 -7.99E-03 3.12E-02 -4.92E-02 4.76E-02 -3.02E-02 1.28E-02 -3.45E-03 S3 (stop) 9.77E-03 -1.64E-02 1.19E-02 1.19E-02 -6.11E-02 9.83E-02 -9.31E-02 5.89E-02 S4 -4.61E-03 -1.66E-02 3.51E-03 -5.94E-03 2.22E-02 -5.21E-02 7.67E-02 -7.59E-02 S5 -4.25E-03 1.17E-01 -1.39E-01 2.13E-01 -2.43E-01 1.77E-01 -5.33E-02 -3.54E-02 S6 -4.16E-02 1.53E-02 -1.12E-01 4.23E-01 -8.49E-01 1.12E+00 -1.04E+00 7.08E-01

[0111] Surface number A18 A20 A22 A24 A26 A28 A30 S1 7.91E-05 -1.84E-05 3.01E-06 -3.39E-07 2.51E-08 -1.09E-09 2.13E-11 S2 4.75E-04 2.65E-05 -2.67E-05 5.75E-06 -6.57E-07 4.07E-08 -1.08E-09 S3 (stop) -2.60E-02 8.21E-03 -1.84E-03 2.85E-04 -2.93E-05 1.79E-06 -4.92E-08 S4 5.22E-02 -2.53E-02 8.66E-03 -2.04E-03 3.16E-04 -2.89E-05 1.18E-06 S5 5.29E-02 -3.24E-02 1.22E-02 -2.98E-03 4.66E-04 -4.25E-05 1.73E-06 S6 -3.54E-01 1.30E-01 -3.48E-02 6.55E-03 -8.23E-04 6.19E-05 -2.11E-06

[0112] Specifically, such as Figure 9 As shown, the six solid curves in the color difference diagram represent wavelengths of light at 650nm, 610nm, 555nm, 510nm, 470nm, and 435nm, respectively. It can be seen that the axial chromatic aberration of the lens in this embodiment is controlled within a very small range, and the chromatic aberration convergence is good. Figure 10 As shown in the MTF defocus diagram, at a spatial frequency of 89 lp / mm, the MTF of the entire field of view is greater than 0.6, indicating extremely high resolution.

[0113] Thirdly, embodiments of this application also disclose an electronic device, including: a housing; a camera module, wherein the camera module is the aforementioned camera module, and the camera module is assembled in the housing.

[0114] In this embodiment, the camera module can be used to take pictures, realizing the shooting function of the electronic device. The housing can be the outer shell of the electronic device, a device used to decorate and protect the electronic device.

[0115] The electronic devices described in this application include, but are not limited to, mobile phones, computers, tablets, and smartwatches.

[0116] The electronic device described in this application embodiment can achieve the same beneficial effects as the camera module described above, and will not be repeated here.

[0117] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0118] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An optical path converting structure (10), characterized by, include: A plastic prism (11) has a reflecting side (113) for reflecting light rays, the surface of the reflecting side (113) being a reflecting surface, and the surface accuracy of the plastic prism (11) being a first value. A reflective glass (12) has a surface accuracy of a second value, which is less than the first value. The reflective glass (12) is bonded to the reflective surface to enhance the reflectivity of the light path conversion structure (10). Light transmitted from the reflective side (113) is directed toward the reflective glass (12) along a first direction, reflected by the reflective glass (12) to a second direction, and then directed toward the reflective side (113). The second direction intersects with the first direction.

2. The optical path converting structure (10) according to claim 1, characterized in that The reflective glass (12) is bonded to the reflective surface by optical adhesive (13), and the difference between the refractive index of the optical adhesive (13) and the refractive index of the plastic prism (11) is less than or equal to a first threshold.

3. The optical path converting structure (10) according to claim 2, characterized in that The optical adhesive (13) covers an area of ​​S1 on the reflective surface, and the effective light-transmitting area on the reflective surface is S2. The relationship between the coverage area S1 of the optical adhesive (13) on the reflective surface and the effective light-transmitting area S2 on the reflective surface satisfies: S1≥S2.

4. The optical path converting structure (10) according to claim 1, characterized in that The reflective glass (12) has a reflective film on the side opposite to the reflective surface, and the reflective film is used to enhance the reflectivity of the reflective glass (12).

5. The optical path converting structure (10) according to claim 1, characterized in that The plastic prism (11) includes at least three circumferentially connected side surfaces, at least one of the circumferentially connected side surfaces being the reflecting surface located on the reflecting side (113).

6. The optical path conversion structure (10) according to claim 1, characterized in that, The optical path conversion structure (10) further includes an incident light side (111) and an exit light side (112). Light enters from the incident light side (111), is reflected by the reflection side (113), and exits from the exit light side (112). The surface of the light-incident side (111) is the light-incident surface, which includes one of a plane, a sphere, and an aspherical surface; The surface of the light-emitting side (112) is a light-emitting surface, which includes one of a plane, a spherical surface, and an aspherical surface.

7. An image capture module, comprising: Includes a lens group (20) and an optical path conversion structure (10) as described in any one of claims 1-6; The lens group (20) has at least one optical path conversion structure (10) on its object side, and / or the lens group (20) has at least one optical path conversion structure (10) on its image side.

8. The camera module according to claim 7, characterized in that, The lens group (20) includes a plurality of lenses (21) arranged sequentially along its optical axis; Along the object side to the image side of the lens group (20), the lens (21) at the first end is a first lens, which has positive optical power and the object side of the first lens is convex.

9. The camera module of claim 7, wherein, The lens group (20) includes a plurality of lenses (21) arranged sequentially along its optical axis; At least some of the lenses (21) are adjustable in position along the optical axis of the lens group (20).

10. An electronic device, comprising: include: case; A camera module, wherein the camera module is according to any one of claims 7 to 9, and the camera module is assembled in the housing.

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