Camera module and electronic device

Abstract

The application discloses a camera module and an electronic device. The camera module comprises a first light path deflection mirror, a first mirror part with positive optical power and a second mirror part with negative optical power, the first light path deflection mirror is used for changing the light rays entering the first mirror part along a first direction to the light rays exiting the second mirror part along a second direction, the second direction intersects the first direction; an image sensor is arranged on the light exit side of the second mirror part and is used for receiving the light rays exiting the second mirror part.

Description

Technical Field

[0001] This application belongs to the field of electronic equipment technology, specifically relating to a camera module and an electronic device. Background Technology

[0002] With the widespread use of electronic devices, the shooting function of electronic devices has become increasingly important. In order to improve the shooting function of electronic devices, more and more electronic devices are equipped with telephoto lenses. However, within the limited space of electronic devices, the size and specifications of telephoto lenses greatly limit the arrangement of other components and the height of the back cover, which is not conducive to the stacking design of electronic devices. Summary of the Invention

[0003] This application aims to provide a camera module and electronic device that at least solves the problem that the size and specifications of a telephoto lens greatly limit the arrangement of other components and the height of the back cover, which is not conducive to the stacking design of electronic devices.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application propose a camera module, comprising: The first optical path deflector includes a first mirror portion having positive optical power and a second mirror portion having negative optical power; the first optical path deflector is used to change light rays that enter the first mirror portion along a first direction to exit the second mirror portion along a second direction, the second direction intersecting the first direction. An image sensor is disposed on the light-emitting side of the second mirror and is used to receive light emitted from the second mirror.

[0005] Secondly, embodiments of this application provide an electronic device, including: case; A camera module, which is the camera module described above, is mounted on the housing.

[0006] In embodiments of this application, the camera module includes a first optical path deflector, a second optical path deflector, and an image sensor. The first optical path deflector has a first lens portion with positive optical power and a second lens portion with negative optical power. The image sensor is disposed on the light-emitting side of the second lens portion, such that light enters the first lens portion along a first direction and exits the second lens portion along a second direction before being transmitted to the image sensor for imaging. Because the first lens portion of the first optical path deflector has positive optical power, it can converge light, and the first optical path deflector can deflect light from the first direction to the second direction, thus achieving optical path folding. This helps to reduce the size of the camera module, saving space for the design of other components and the back cover, and is beneficial for the stacking design of electronic devices.

[0007] 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

[0008] 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: Figure 1 This is a schematic diagram of the optical path of a camera module according to an embodiment of this application; Figure 2 This is a schematic diagram of the optical path of the camera module corresponding to Embodiment 1 of this application; Figure 3 This is a schematic diagram of the axial color difference corresponding to Embodiment 1 of this application; Figure 4 This is a schematic diagram of the defocused MTF corresponding to Embodiment 1 of this application; Figure 5 This is a schematic diagram of the optical path of the camera module corresponding to Embodiment 2 of this application; Figure 6 This is a schematic diagram of the axial color difference corresponding to Embodiment 2 of this application; Figure 7 This is a schematic diagram of the defocused MTF corresponding to Embodiment 2 of this application.

[0009] Figure label: 10. First optical path deflector; 11. First mirror section; 12. Total internal reflection prism; 13. Second mirror section; 20. Lens group; 21. First mirror group; 211. First lens; 212. Second lens; 213. Third lens; 214. Fourth lens; 22. Second mirror group; 221. Fifth lens; 222. Sixth lens; 223. Seventh lens; 30. Second optical path deflector; 40. Filter; 50. Image sensor; S. Optical axis. Detailed Implementation

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] The following is combined Figures 1-7 The camera module described in this application includes: a first optical path deflector 10, comprising a first mirror portion 11 having positive optical power and a second mirror portion 13 having negative optical power, the first optical path deflector 10 being used to change light entering the first mirror portion 11 along a first direction to exiting the second mirror portion 13 along a second direction; and an image sensor 50, disposed on the light-emitting side of the second mirror portion 13, for receiving light emitted from the second mirror portion 13.

[0015] In the embodiments of this application, the camera module includes a first optical path deflector 10 and an image sensor 50. The first optical path deflector 10 has a first lens portion 11 with positive optical power and a second lens portion 13 with negative optical power. The image sensor 50 is disposed on the light-emitting side of the second lens portion 13, so that light enters the first lens portion 11 in a first direction and exits the second lens portion 13 in a second direction before being transmitted to the image sensor 50 for imaging. Since the first lens portion 11 of the first optical path deflector 10 has positive optical power, it can converge light, and the first optical path deflector 10 can deflect light from the first direction to the second direction, which can realize the folding of the optical path, which is beneficial to reducing the size of the camera module, saving space for the design of other components and the back cover, and is beneficial to the stacking design of electronic devices.

[0016] The camera module described in this embodiment can be applied to electronic devices with shooting functions, such as mobile phones, computers, laptops, or cameras. The camera module may include a lens assembly, a filter 40, an image sensor 50, and a circuit board. The lens assembly and filter 40 constitute the optical system of the camera module, responsible for processing light and converging external light cleanly, accurately, and without distortion onto the image sensor 50. The lens assembly is used for light focusing, imaging, and aberration correction; the filter 40 is used for color correction. The substrate of the filter 40 can be flat glass, with an AR anti-reflection coating and an IR cut-off coating respectively coated on its surface to filter near-infrared light. The image sensor 50 has an imaging surface, acting as a light receiver, and can perform photoelectric conversion to convert light signals into electrical signals for imaging. The circuit board can be electrically connected to the image sensor 50 and can be used for power supply, data transmission, and control signals.

[0017] Specifically, the lens assembly, filter 40, and image sensor 50 can be arranged sequentially along the optical axis of the optical system, so that after the light is processed by the lens assembly, it is transmitted to the filter 40 for filtering, and then transmitted to the image sensor 50 for imaging. That is, the object-side light can be imaged on the image sensor 50 after being refracted by the lens assembly.

[0018] Specifically, the core parameters of a camera module include the field of view (FOV), which is the angle between the two edges of the lens assembly that allow the image of the subject to pass through the lens assembly to its maximum extent. The size of the FOV determines the field of view of the lens assembly; the larger the FOV, the wider the field of view. The half field of view (HFOV) refers to half of the FOV.

[0019] Specifically, a core parameter of the camera module also includes the aperture. The aperture is a device used to control the amount of light passing through the lens assembly and entering the electronic device. It is usually expressed by the F# value within the lens assembly. The aperture number F# is a relative value derived from the focal length or light-gathering diameter of the lens assembly (the reciprocal of the relative aperture). The smaller the F# value, the more light enters in the same unit of time, the shallower the depth of field, and the background content of the photo will be blurred, producing an effect similar to that of a telephoto lens.

[0020] Specifically, the side of the lens assembly where the object is located is called the object side, and the side of the lens assembly facing the object side is called the object-side side of the lens assembly. The side of the lens assembly where the image of the object is located is called the image side, and the side of the lens assembly facing the image side is called the image-side side.

[0021] In some embodiments, the lens assembly may include a first optical path deflector 10, which can change the propagation direction of light, fold the optical path, and adjust the optical axis, which is beneficial to reducing the size of the lens assembly and thus reducing the overall size of the camera module, which is beneficial to the stacking design of electronic devices.

[0022] In some embodiments, the first optical path deflector 10 may include a first lens portion 11 and a second lens portion 13. The first lens portion 11 has positive optical power and may be a separate convex lens, or it may be a portion integrated into the first optical path deflector 10. The second lens portion 13 has negative optical power and may be a separate concave lens, or it may be a portion integrated into the first optical path deflector 10. That is, the first optical path deflector 10 may be a single integral lens, or it may be composed of multiple lenses.

[0023] In some embodiments, the first mirror portion 11 can be used as the light-incident portion of the first optical path deflector 10, for receiving external light, i.e., the object-side surface of the first mirror portion 11 is the object-side surface of the first optical path deflector 10. The first mirror portion 11 can also be used as the light-outceasing portion of the first optical path deflector 10, for emitting light, i.e., the image-side surface of the second mirror portion 13 is the image-side surface of the first optical path deflector 10. The first optical path deflector 10 can deflect light rays incident along a first direction into the first mirror portion 11 to a second direction and direct them towards the second mirror portion 13, so that light rays incident along the first direction into the first optical path deflector 10 can exit from the second direction. For example... Figure 1 As shown, the first direction is the X direction, and the second direction is the Y direction. The first and second directions intersect, but in this embodiment, they are described as perpendicular.

[0024] In some embodiments, the optical axis of the first mirror 11 can be arranged along a first direction, so that the first mirror 11 can receive light rays incident along the first direction. The optical axis of the second mirror 13 can be arranged along a second direction, so that light rays can be emitted along the second direction.

[0025] In some embodiments, because the first lens 11 has positive optical power, it can converge light rays, bringing a wide range of incident light towards the optical axis, thereby enabling more effective light to reach the image sensor 50 and improving near-light output, low-light image quality, and signal-to-noise ratio. Furthermore, the first lens 11 can pre-deflect light rays, resulting in a shorter equivalent focal length for the entire optical system, which helps to design a smaller overall camera module size. Specifically, optical power characterizes the refractive ability of a lens or optical element to refract incident parallel light beams.

[0026] In some embodiments, the Abbe number of the first mirror 11 is greater than that of the second mirror 13, so that the first mirror 11 and the second mirror 13 can provide different dispersion characteristics. The positive dispersion characteristics generated by the first mirror 11 can cancel out the negative dispersion characteristics generated by the second mirror 13, so that the dispersion generated by the first mirror 11 can be corrected by the second mirror 13. With this characteristic, the first mirror 11 and the second mirror 13 can be combined to form better achromatic characteristics than a single material, which helps to reduce the chromatic aberration of the overall optical system.

[0027] In some embodiments, the Abbe number of the first lens 11 is VD1, where VD1 > 75, and the Abbe number of the second lens 13 is VD2, where VD2 < 40. This results in the first lens 11 having a positive optical power and a large Abbe number, and the second lens 13 having a negative optical power and a small Abbe number. The dispersion directions of the first lens 11 and the second lens 13 are opposite. The difference in the refraction of different colors of light by the first lens 11 and the second lens 13 can be used to cancel out the dispersion, thereby achieving chromatic aberration cancellation. This eliminates the overall chromatic aberration of the optical system through the cooperation of the first lens 11 and the second lens 13, thereby improving the shooting effect of the camera module and enhancing the image quality.

[0028] Specifically, the first mirror 11 and the second mirror 13 can be designed independently. The first mirror 11 and the second mirror 13 can be made of optical materials with the same or different refractive indices, so as to make the first mirror 11 and the second mirror 13 with different Abbe numbers respectively.

[0029] In some alternative embodiments, the first optical path deflector 10 includes a total internal reflection prism 12, a first mirror portion 11 connected to one right-angle side of the total internal reflection prism 12, and a second mirror portion 13 connected to the other right-angle side of the total internal reflection prism 12; the surface of the first mirror portion 11 away from the total internal reflection prism 12 is convex; and the surface of the second mirror portion 13 away from the total internal reflection prism 12 is concave.

[0030] In this embodiment, the first optical path deflector 10 can be composed of a first mirror 11, a total reflection prism 12 and a second mirror 13. It has a simple structure and can effectively deflect the optical path, reducing the overall size of the camera module.

[0031] Specifically, the surface of the first mirror portion 11 facing the total internal reflection prism 12 can be flat to ensure the reliability of the connection between the first mirror portion 11 and the total internal reflection prism 12. Similarly, the surface of the second mirror portion 13 facing the total internal reflection prism 12 can be flat to ensure the reliability of the connection between the second mirror portion 13 and the total internal reflection prism 12. The first mirror portion 11, the total internal reflection prism 12, and the second mirror portion 13 can be integrally formed, or they can be manufactured independently and then assembled into a single unit.

[0032] In some embodiments, the inclined surface of the total internal reflection prism 12 can be coated with a reflective film to further ensure the reflective ability of the total internal reflection prism 12 to reflect light, thereby ensuring the reliability of light entering the first mirror 11 in the first direction and exiting the second mirror 13 in the second direction.

[0033] In some embodiments, the total internal reflection prism 12 can also be replaced by a reflector, or by a component containing a reflective surface, as long as it can refract the light rays incident along the first direction to the second direction. This application does not make specific limitations on this aspect.

[0034] In some embodiments, the surface of the first mirror 11 away from the total internal reflection prism 12 is convex, which facilitates the focusing of light rays through the first mirror 11 to increase the amount of light entering the optical system. The surface of the second mirror 13 away from the total internal reflection prism 12 is concave, which facilitates the cooperation between the second mirror 13 and the first mirror 11 to eliminate chromatic aberration.

[0035] In some embodiments, the surface of the first mirror 11 away from the total internal reflection prism 12 is convex, and the surface shape of this convex surface can be spherical, aspherical, or freeform. The surface of the second mirror 13 away from the total internal reflection prism 12 is concave, and the surface shape of this concave surface can be spherical, aspherical, or freeform.

[0036] In some alternative embodiments, the camera module further includes a second optical path deflector 30, which can be disposed on the object side of the image sensor 50 to deflect the optical path, thereby further reducing the size of the camera module.

[0037] In some embodiments, the second optical path deflector 30 may include a reflector or a prism. Taking the second optical path deflector 30 including a total internal reflection prism 12 as an example, one right-angle side of the second optical path deflector 30 may be opposite to the light-emitting side of the second mirror 13, and the other right-angle side of the second optical path deflector 30 may be opposite to the filter 40, so that after light enters the second optical path deflector 30 along the second direction, it can be deflected to the first direction and directed toward the filter 40, and then into the image sensor 50.

[0038] In other embodiments, the second optical path deflector 30 may also be a right-angled prism with a 30-degree angle. In this case, one right-angled side of the second optical path deflector 30 may be opposite to the light-emitting side of the second mirror 13, and the inclined side of the second optical path deflector 30 may be opposite to the image sensor 50 to reflect light rays multiple times.

[0039] In some embodiments, the camera module further includes a lens group 20, and a first optical path deflector 10 may be disposed on the front side of the lens group 20 as a front reflector. A second optical path deflector 30 may be disposed on the rear side of the lens group 20 as a rear reflector. Figure 1 As shown, light first enters the first optical path deflector 10 from the first mirror 11, is deflected, exits the first optical path deflector 10 from the second mirror 13, then enters the lens group 20, is deflected again by the second optical path deflector 30, then enters the filter 40, and finally enters the image sensor 50.

[0040] In some optional embodiments, the camera module further includes a lens group 20, which may be disposed between the second lens portion 13 and the image sensor 50. The lens group 20 includes a first lens 211, a second lens 212, a third lens 213, and a fourth lens 214 disposed sequentially. The first lens 211 is disposed between the second lens portion 13 and the second lens 212. The first lens 211 has positive optical power, the second lens 212 has negative optical power, and the Abbe number of the first lens 211 is greater than the Abbe number of the second lens 212. The third lens 213 has negative optical power, the fourth lens 214 has positive optical power, the Abbe number of the third lens 213 is less than the Abbe number of the fourth lens 214, and the Abbe number of the fourth lens 214 is less than the Abbe number of the first lens 211.

[0041] In this embodiment, the first lens 211 has positive optical power, and the second lens 212 has negative optical power. The Abbe number of the first lens 211 is greater than that of the second lens 212, so that the first lens 211 and the second lens 212 can provide different dispersion characteristics. The positive dispersion characteristics generated by the first lens 211 can cancel out the negative dispersion characteristics generated by the second lens 212, so that the dispersion generated by the first lens 211 can be corrected by the second lens 212. With this characteristic, the first lens 211 and the second lens 212 can be combined to form better achromatic characteristics than a single material, which helps to reduce the chromatic aberration of the overall optical system. Similarly, the third lens 213 has negative optical power, and the fourth lens 214 has positive optical power. The Abbe number of the third lens 213 is less than that of the fourth lens 214, and the Abbe number of the fourth lens 214 is less than that of the first lens 211. This allows the third lens 213 and the fourth lens 214 to provide different dispersion characteristics. With this characteristic, the first lens 211 and the second lens 212 can be combined to form better achromatic characteristics than a single material, which helps to reduce the chromatic aberration of the overall optical system.

[0042] Specifically, the combination of the first lens 211 and the second lens 212 can eliminate chromatic aberration, and the combination of the third lens 213 and the fourth lens 214 can also eliminate chromatic aberration. The cooperation of multiple lenses can further improve the effect of eliminating chromatic aberration in the optical system, thereby improving the shooting quality.

[0043] Specifically, the first lens 211 has positive optical power, the second lens 212 has negative optical power, the Abbe number of the first lens 211 is greater than the Abbe number of the second lens 212, and the overall optical power of the combination of the first lens 211 and the second lens 212 is positive. That is, the combination of the first lens 211 and the second lens 212 forms a first lens group, and the effective focal length of the first lens group is greater than zero. The third lens 213 has negative optical power, the fourth lens 214 has positive optical power, the Abbe number of the third lens 213 is less than the Abbe number of the fourth lens 214, and the overall optical power of the combination of the first lens 211 and the second lens 212 is positive. That is, the combination of the third lens 213 and the fourth lens 214 forms a second lens group, and the effective focal length of the second lens group is greater than zero.

[0044] Specifically, effective focal length (EFL) is a measure of an optical system's ability to focus or disperse light. It refers to the vertical distance from the optical center of the lens or lens group 20 to the focal plane when a distant object is projected into a sharp image through the lens or lens group 20. From a practical perspective, it can be understood as the distance from the center of the lens (lens assembly) to the image plane.

[0045] Specifically, among the first lens 211, the second lens 212, the third lens 213, and the fourth lens 214, the first lens 211 has the largest Abbe number and its optical power is positive. The overall optical power of the lens group 20 is positive to facilitate the convergence of light rays to form a real image.

[0046] In some embodiments, the shapes of the first lens 211, the second lens 212, the third lens 213, and the fourth lens 214 can be diverse. For example, the first lens 211 has positive optical power, and both its object-side and image-side surfaces are convex. The second lens 212 has negative optical power, and both its object-side and image-side surfaces are concave. The third lens 213 has negative optical power, and both its object-side and image-side surfaces are concave. The fourth lens 214 has positive optical power, and both its object-side and image-side surfaces are convex.

[0047] In some embodiments, the object-side surface of the first lens 211, the second lens 212, the third lens 213, and the fourth lens 214 can be spherical, aspherical, or freeform, etc. The image-side surface of the first lens 211, the second lens 212, the third lens 213, and the fourth lens 214 can be spherical, aspherical, or freeform, etc.

[0048] In some embodiments, the Abbe number of the second lens 212 is greater than the Abbe number of the third lens 213.

[0049] In this embodiment, the optical power of the first lens 211 and the fourth lens 214 are both positive, and the Abbe number of the first lens 211 is greater than that of the fourth lens 214. The optical power of the second lens 212 and the third lens 213 are both negative, and the Abbe number of the second lens 212 is greater than that of the third lens 213. This allows the lens group of the first lens 211 and the second lens 212, together with the lens group of the third lens 213 and the fourth lens 214, to provide different dispersion characteristics. By means of these characteristics, the lens group of the first lens 211 and the second lens 212, together with the lens group of the third lens 213 and the fourth lens 214, can eliminate chromatic aberration and reduce the chromatic aberration of the overall optical system.

[0050] Specifically, the greater the difference in Abbe number between the first lens 211 and the second lens 212, and the greater the difference in Abbe number between the third lens 213 and the fourth lens 214, the more favorable it is to combine them to achieve the desired achromatic characteristics.

[0051] In some alternative embodiments, the Abbe number of the first lens 211 is VD3, where VD3 > 75; the Abbe number of the second lens 212 is VD4, where 40 < VD4 < 60; the Abbe number of the third lens 213 is VD5, where VD5 < 40; and the Abbe number of the fourth lens 214 is VD6, where 40 < VD6 < 60.

[0052] In the embodiments of this application, the Abbe numbers of the first lens 211, the second lens 212, the third lens 213, and the fourth lens 214 can be designed within a reasonable range, which is beneficial to eliminate chromatic aberration by using the combination of the first lens 211 and the second lens 212, and by using the combination of the third lens 213 and the fourth lens 214, thereby ensuring the shooting quality of the camera module.

[0053] Specifically, the Abbe number VD3 of the first lens 211 is greater than 75, which allows for a larger Abbe number design, resulting in a smaller positive chromatic aberration produced by the first lens 211, making it easier to eliminate. The Abbe number of the second lens 212 is VD4, and by controlling 40 < VD4 < 60, it is also possible to design a larger Abbe number for the second lens 212. Increasing the Abbe number of the concave lens is more beneficial for counteracting the positive chromatic aberration produced by the first lens 211, thereby helping to eliminate chromatic aberration in the optical system.

[0054] In some embodiments, since the Abbe number of the first lens 211 is VD3 (VD3 > 75) and the Abbe number of the second lens 212 is VD4 (40 < VD4 < 60), it is convenient to ensure that the Abbe number of the first lens 211 is greater than the Abbe number of the second lens 212. Since the Abbe number of the fourth lens 214 is VD6 (40 < VD6 < 60), it is convenient to ensure that the Abbe number of the first lens 211 is greater than the Abbe number of the fourth lens 214. The Abbe numbers of the second lens 212 and the fourth lens 214 can be the same or different.

[0055] In some embodiments, since the Abbe number of the third lens 213 is VD5 (VD5 < 40) and the Abbe number of the fourth lens 214 is VD6 (40 < VD6 < 60), it is convenient to ensure that the Abbe number of the fourth lens 214 is greater than that of the third lens 213. Similarly, since the Abbe number of the second lens 212 is VD4 (40 < VD4 < 60), it is convenient to ensure that the Abbe number of the second lens 212 is greater than that of the third lens 213.

[0056] In some alternative embodiments, the difference between the Abbe numbers of the first lens 211 and the second lens 212 is greater than or equal to 25; the difference between the Abbe numbers of the third lens 213 and the fourth lens 214 is greater than or equal to 25.

[0057] In this embodiment, the difference in Abbe number between the first lens 211 and the second lens 212 is greater than or equal to 25, which is beneficial for increasing the difference in chromatic dispersion characteristics between the first lens 211 and the second lens 212. Similarly, the difference in Abbe number between the third lens 213 and the fourth lens 214 is greater than or equal to 25, which is beneficial for increasing the difference in chromatic dispersion characteristics between the third lens 213 and the fourth lens 214. A greater difference in chromatic dispersion characteristics is more conducive to achieving the desired achromatic characteristics. In this embodiment, by maintaining a large difference in chromatic dispersion characteristics between the first lens 211 and the second lens 212, and between the third lens 213 and the fourth lens 214, chromatic aberration in the optical system can be better eliminated, improving image quality.

[0058] In some alternative embodiments, the first lens 211 is a glass lens; the second lens 212, the third lens 213 and the fourth lens 214 are all resin lenses, and the object side and the image side of the second lens 212, the third lens 213 and the fourth lens 214 are both aspherical.

[0059] In this embodiment, the first lens 211 is a glass lens, which facilitates the design of a larger Abbe number for the first lens 211. The second lens 212, the third lens 213, and the fourth lens 214 are all resin lenses, which helps to reduce the cost of the lens group 20. The object-side and image-side surfaces of the second lens 212, the third lens 213, and the fourth lens 214 are all designed aspherical, which can effectively correct spherical aberration and distortion, reduce the number of lenses, reduce the volume and thickness of the lens group 20, and improve light transmittance and imaging uniformity, which helps to meet the requirements of camera modules for miniaturization, large aperture, and high imaging quality.

[0060] In some embodiments, the object side of the first lens 211 is designed to be spherical, and the image side of the first lens 211 is planar. This can increase the manufacturing difficulty, help reduce costs, and make it easier to achieve positive optical power for the first lens 211.

[0061] In some embodiments, the object-side and image-side surfaces of the first lens 211 may also be designed as aspherical.

[0062] Specifically, the second lens 212 has a negative optical power, and designing a larger Abbe number for the second lens 212 is beneficial for eliminating chromatic aberration in the optical system. To ensure the difference between the Abbe numbers of the first lens 211 and the second lens 212, the first lens 211 can be designed as a glass lens to increase its Abbe number. In this case, the Abbe number of the second lens 212 can also be increased, thereby effectively eliminating chromatic aberration in the optical system.

[0063] In some alternative embodiments, the lens group 20 includes a first lens group 21 and a second lens group 22, the second lens group 22 being disposed between the first lens group 21 and the image sensor 50, and one of the first lens group 21 and the second lens group 22 being movable along the optical axis; wherein, the first lens 211, the second lens 212, the third lens 213 and the fourth lens 214 are combined to form the first lens group 21.

[0064] In this embodiment, one of the first lens group 21 and the second lens group 22 can move along the optical axis to facilitate focusing, so that the object being photographed is clearly imaged on the image sensor 50, thereby improving the shooting quality of the camera module.

[0065] In some embodiments, the first lens group 21 can move along the optical axis to achieve focusing. In other embodiments, the second lens group 22 can move along the optical axis to achieve focusing.

[0066] In some embodiments, the optical axis is the central reference line of the camera module and is the core benchmark that determines the image sharpness, symmetry, and accuracy. The optical axis is an imaginary straight line, represented by the straight line S in the figure. The optical axis can be the axis of symmetry that passes through the geometric center of the first optical path deflector 10, lens group 20, filter 40, and image sensor 50. The optical axis can be perpendicular to the effective imaging surface of the image sensor 50.

[0067] In some embodiments, the first lens 211, the second lens 212, the third lens 213, and the fourth lens 214 are combined to form a first lens group 21, which can be a single, integral structure. In some cases, the first lens group 21 may also include three or five lenses, etc. In this embodiment, four lenses are used as an example for illustration.

[0068] In some embodiments, the second lens group 22 can be a single, integral structure. The second lens group 22 may include three, four, or five lenses, etc., and this application does not specifically limit this.

[0069] In some alternative embodiments, the second lens group 22 includes a fifth lens 221, a sixth lens 222, and a seventh lens 223 arranged sequentially, with the fifth lens 221 disposed between the fourth lens 214 and the sixth lens 222; the fifth lens 221 has negative optical power, the sixth lens 222 has positive optical power, and the seventh lens 223 has negative optical power; or, the fifth lens 221 has positive optical power, the sixth lens 222 has negative optical power, and the seventh lens 223 has negative optical power.

[0070] In this embodiment, the first lens 211, second lens 212, third lens 213, fourth lens 214, fifth lens 221, sixth lens 222, and seventh lens 223 work together to effectively eliminate chromatic aberration and improve the shooting quality of the camera module. Furthermore, in some cases, the fifth lens 221 has negative optical power, the sixth lens 222 has positive optical power, and the seventh lens 223 has negative optical power; in other cases, the fifth lens 221 has positive optical power, the sixth lens 222 has negative optical power, and the seventh lens 223 has negative optical power, allowing for diverse design options for the optical power of the fifth lens 221, the sixth lens 222, and the seventh lens 223.

[0071] In some embodiments, the shapes of the fifth lens 221, the sixth lens 222, and the seventh lens 223 can be varied. For example, the fifth lens 221 can have negative optical power, its object-side surface can be concave, and its image-side surface can be convex. The seventh lens 223 can have negative optical power, and its image-side surface can be concave.

[0072] In some alternative embodiments, the Abbe number of the fifth lens 221 is VD7, where VD7 > 40; the Abbe number of the sixth lens 222 is VD8, where VD8 < 40; and the Abbe number of the seventh lens 223 is VD9, where VD9 > 40.

[0073] In this embodiment, by controlling the Abbe number of the fifth lens 221, the sixth lens 222 and the seventh lens 223 within a reasonable range, it is beneficial to achieve better elimination of chromatic aberration through the cooperation of the second lens group 22 and the first lens group 21, thereby ensuring the shooting quality of the camera module.

[0074] Example 1: like Figure 2 As shown, light rays are directed towards the first mirror 11 along the first direction, deflected to the second direction by the total internal reflection prism 12, and then emitted from the second mirror 13. After passing through each lens in the lens group 20 in sequence, the light rays are deflected again to the first direction by the second optical path deflector 30, and then pass through the filter 40, finally forming an image on the image sensor 50.

[0075] The first mirror 11 has a positive optical power and an Abbe number VD1 > 75, while the second mirror 13 has a negative optical power and an Abbe number Vd2 < 40. The first mirror 11 and the second mirror 13 are combined with the total internal reflection prism 12 using optical materials with the same or different refractive indices.

[0076] The lens group 20 includes a first lens 211, a second lens 212, a third lens 213, a fourth lens 214, a fifth lens 221, a sixth lens 222, and a seventh lens 223 arranged in sequence from left to right; the first lens 211, the second lens 212, the third lens 213, and the fourth lens 214 are combined to form a first lens group 21, and the fifth lens 221, the sixth lens 222, and the seventh lens 223 are combined to form a second lens group 22. The first lens 211 has a positive optical power, and both its object and image sides are convex, and its Abbe number Vd3 satisfies Vd3 > 75; the second lens 212 has a negative optical power, and both its object and image sides are concave, and its Abbe number Vd4 satisfies 40 < Vd4 < 60; the third lens 213 has a positive optical power, and both its object and image sides are concave, and its Abbe number Vd5 satisfies Vd5 < 40; the fourth lens 214 has a positive focal length, and both its object and image sides are convex, and its Abbe number Vd6 satisfies 40 < Vd6 < 60; the fifth lens 221 has a negative optical power, its object side is concave, and its image side is convex, and its Abbe number Vd7 satisfies Vd7 > 40; the sixth lens 222 has a positive optical power, and its Abbe number Vd8 satisfies Vd8 < 40; the seventh lens 223 has a negative optical power, its image side is concave, and its Abbe number Vd9 satisfies Vd9 > 40.

[0077] In some embodiments, the incident surface of the first lens unit 11, the exit surface of the second lens unit 13, and the surface types of the object and image sides of the first lens 211, the second lens 212, the third lens 213, the fourth lens 214, the fifth lens 221, the sixth lens 222, and the seventh lens 223 can all be designed as aspherical surfaces. The formula for the aspherical surface is:

[0078] where the parameter c = 1 / R, that is, the curvature corresponding to the radius; r is the perpendicular distance from a point on the optical surface to the optical axis; z represents the sagittal height of the point along the optical axis direction; k is the conic coefficient of the optical surface, and Ai represents the i-th order aspherical coefficient.

[0079] According to the limiting conditions, some embodiments of the conditional boundaries are as follows: The basic specifications achieved in Embodiment 1 are as shown in Table 1-1: Table 1-1,

[0080] where EFL is the system focal length of the optical system, F# is the system aperture of the optical system, DFOV is the field angle, f11 is the combined focal length of the first two lenses (the first and second lenses) of the first lens group, f12 is the combined focal length of the last two lenses (the third and fourth lenses) of the first lens group, satisfying f11 > 0 and f12 > 0, and f2 is the focal length of the second lens group.

[0081] The surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical system of Example 1 are shown in Table 1-2 below: Table 1-2,

[0082] As shown in Table 1-2, S1-S20 represent the surfaces through which the light rays pass in sequence. Specifically, S3 represents the object-side surface of the first mirror 11, S4 represents the object-side surface of the total internal reflection prism 12, S5 represents the image-side surface of the total internal reflection prism 12, and S6 represents the image-side surface of the second mirror 13. S7 represents the object-side surface of the first lens 211, S8 represents the image-side surface of the first lens 211, and similarly, S9 represents the object-side surface of the second lens 212, S10 represents the image-side surface of the first lens 211, S19 represents the object-side surface of the seventh lens 223, and S20 represents the image-side surface of the seventh lens 223.

[0083] As shown in Table 1-2, the object-side surface of the first mirror 11 is aspherical, with a radius of curvature of 28.30 mm and a thickness of 1.3 mm (meaning the path length of light passing through the first mirror 11 is 1.3 mm). The refractive index of the first mirror 11 is 1.49, and its Abbe number is 81.6. The object-side and image-side surfaces of the total internal reflection prism 12 are both planar. The path length of light passing through the total internal reflection prism 12 is 9.9 mm, its refractive index is 1.51, and its Abbe number is 64.2. The image-side surface of the second mirror 13 is aspherical, with a radius of curvature of 81.03 mm, a refractive index of 1.69, and its Abbe number is 31.1. The path of light transmission through the first lens 211 is 2.65 mm, and the gap between the first lens 211 and the second lens 212 is 0.21 mm. The object-side radius of curvature of the first lens 211 is 6.53 mm, the image-side radius of curvature is -315.22 mm, the refractive index is 1.43, and the Abbe number is 95.1. The object-side radius of curvature of the second lens 212 is 255.26 mm, the image-side radius of curvature is 12.04 mm, the refractive index is 1.54, and the Abbe number is 55.8. Similarly, the parameters of other lenses in the lens group 20 will not be described further.

[0084] The aspherical higher-order coefficients of each lens surface in Example 1 are shown in Table 1-3 below: Table 1-3,

[0085]

[0086]

[0087] The axial color difference in Example 1 is as follows Figure 3 As shown, Figure 3 As shown, blue represents blue light with a wavelength of 435nm, green represents green light with a wavelength of 486nm, red represents red light with a wavelength of 546nm, yellow represents yellow light with a wavelength of 587nm, and orange-red represents orange-red light with a wavelength of 656nm. The figure shows that the color difference range for red light is within -0.04 to 0.01, and the color difference range for green light is within -0.05 to 0.01. In Example 1, the color difference of each color of light can be controlled within a small range, resulting in good color difference convergence.

[0088] The MTF defocus image of Example 1 is as follows: Figure 4 As shown, from Figure 4 As can be seen, 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.

[0089] Example 2: like Figure 5 As shown, light rays are directed towards the first mirror 11 along the first direction, deflected to the second direction by the total internal reflection prism 12, and then emitted from the second mirror 13. After passing through each lens in the lens group 20 in sequence, the light rays are deflected again to the first direction by the second optical path deflector 30, and then pass through the filter 40, finally forming an image on the image sensor 50.

[0090] The first mirror 11 has a positive optical power and an Abbe number VD1 > 75, while the second mirror 13 has a negative optical power and an Abbe number Vd2 < 40. The first mirror 11 and the second mirror 13 are combined with the total internal reflection prism 12 using optical materials with the same or different refractive indices.

[0091] The lens group 20 includes a first lens 211, a second lens 212, a third lens 213, a fourth lens 214, a fifth lens 221, a sixth lens 222, and a seventh lens 223 arranged in sequence from left to right; the first lens 211, the second lens 212, the third lens 213, and the fourth lens 214 are combined to form a first lens group 21, and the fifth lens 221, the sixth lens 222, and the seventh lens 223 are combined to form a second lens group 22. The first lens 211 has a positive optical power, and both its object and image sides are convex, and its Abbe number Vd3 satisfies Vd3 > 75; the second lens 212 has a negative optical power, and both its object and image sides are concave, and its Abbe number Vd4 satisfies 40 < Vd4 < 60; the third lens 213 has a positive optical power, and both its object and image sides are concave, and its Abbe number Vd5 satisfies Vd5 < 40; the fourth lens 214 has a positive focal length, and both its object and image sides are convex, and its Abbe number Vd6 satisfies 40 < Vd6 < 60; the fifth lens 221 has a positive optical power, its object side is concave, and its image side is convex, and its Abbe number Vd7 satisfies Vd7 > 40; the sixth lens 222 has a negative optical power, and its Abbe number Vd8 satisfies Vd8 < 40; the seventh lens 223 has a negative optical power, its image side is concave, and its Abbe number Vd9 satisfies Vd9 > 40.

[0092] The basic specifications achieved in Example 2 are as shown in Table 2-1 below: Table 2-1,

[0093] Among them, EFL is the system focal length of the optical system, F# is the system aperture of the optical system, DFOV is the field angle, f11 is the combined focal length of the first two lenses (the first and second lenses) of the first lens group, f12 is the combined focal length of the last two lenses (the third and fourth lenses) of the first lens group, satisfying f11 > 0 and f12 > 0, and f2 is the focal length of the second lens group.

[0094] The surface types, radii of curvature, thicknesses, refractive indices, and Abbe numbers of each lens in the optical system of Example 2 are as shown in Table 2-2 below: Table 2-2,

[0095] As shown in Table 2-2, S1-S20 represent the surfaces through which the light rays pass in sequence. Specifically, S3 represents the object-side surface of the first mirror 11, S4 represents the object-side surface of the total internal reflection prism 12, S5 represents the image-side surface of the total internal reflection prism 12, and S6 represents the image-side surface of the second mirror 13. S7 represents the object-side surface of the first lens 211, S8 represents the image-side surface of the first lens 211, and similarly, S9 represents the object-side surface of the second lens 212, S10 represents the image-side surface of the first lens 211, S19 represents the object-side surface of the seventh lens 223, and S20 represents the image-side surface of the seventh lens 223.

[0096] As shown in Table 2-2, the object-side surface of the first mirror 11 is aspherical, with a radius of curvature of 30.21 mm and a thickness of 1.2 mm (meaning the path length of light passing through the first mirror 11 is 1.3 mm). The refractive index of the first mirror 11 is 1.49, and its Abbe number is 81.6. The object-side and image-side surfaces of the total internal reflection prism 12 are both planar. The path length of light passing through the total internal reflection prism 12 is 9.9 mm, its refractive index is 1.51, and its Abbe number is 64.2. The image-side surface of the second mirror 13 is aspherical, with a radius of curvature of 100.60 mm, a refractive index of 1.69, and its Abbe number is 31.1. The object-side radius of curvature of the first lens 211 is 7.24 mm, the image-side radius of curvature is -57.68 mm, the refractive index is 1.43, and the Abbe number is 95.1. The object-side radius of curvature of the second lens 212 is -125.31 mm, the image-side radius of curvature is 14.29 mm, the refractive index is 1.54, and the Abbe number is 56. Similarly, the parameters of other lenses in lens group 20 will not be elaborated further.

[0097] The aspherical higher-order coefficients of each lens surface in Example 2 are shown in Table 2-3 below: Table 2-3,

[0098]

[0099]

[0100] The axial color difference in Example 2 is as follows Figure 6 As shown, Figure 6As shown, blue represents blue light with a wavelength of 435nm, green represents green light with a wavelength of 486nm, red represents red light with a wavelength of 546nm, yellow represents yellow light with a wavelength of 587nm, and orange-red represents orange-red light with a wavelength of 656nm. The figure shows that the color difference range for red light is within -0.03 to 0.02, and the color difference range for green light is also within -0.03 to 0.03. In Example 1, the color difference of each color of light can be controlled within a small range, resulting in good color difference convergence.

[0101] The MTF defocus plot of Example 2 is as follows Figure 7 As shown, from Figure 7 As can be seen, 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.

[0102] The camera module described in this application embodiment has at least the following advantages: In an embodiment of this application, the camera module includes a first optical path deflector and an image sensor. The first optical path deflector has a first lens portion with positive optical power and a second lens portion with negative optical power. The image sensor is disposed on the light-emitting side of the second lens portion, so that light enters the first lens portion along a first direction and exits the second lens portion along a second direction before being transmitted to the image sensor for imaging. Since the first lens portion of the first optical path deflector has positive optical power, it can converge light, and the first optical path deflector can deflect light from the first direction to the second direction, which can realize the folding of the optical path. This helps to reduce the size of the camera module, saving space for the design of other components and the back cover, and is beneficial for the stacking design of electronic devices.

[0103] Secondly, embodiments of this application also provide an electronic device, including: a housing; a camera module, wherein the camera module is the camera module described above, and the camera module is mounted on the housing.

[0104] In this application embodiment, the electronic device includes, but is not limited to, mobile phones, computers, smartwatches, telephoto lenses, or cameras. Taking a mobile phone as an example, the camera module can be a telephoto lens, and the equivalent focal length of the telephoto lens can be 3.5 times (X) or more of the main camera of the mobile phone. In this application embodiment, by using a combination of positive and negative optical power lenses, a good chromatic aberration correction effect is formed, the size of the telephoto lens is reduced, and the size of the first and second optical path deflectors, as well as the optical materials of the lens group, can be flexibly set, increasing the flexibility and portability of the overall mobile phone design and helping to reduce costs.

[0105] Specifically, the housing is the outer shell of the electronic device and can be used to protect the camera module.

[0106] 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.

[0107] 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.

[0108] 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. A camera module, characterized in that, include: The first optical path deflector includes a first mirror portion having positive optical power and a second mirror portion having negative optical power. The first optical path deflector is used to change light rays that enter the first mirror portion along a first direction to exit the second mirror portion along a second direction, wherein the second direction intersects the first direction. An image sensor is disposed on the light-emitting side of the second mirror and is used to receive light emitted from the second mirror.

2. The camera module according to claim 1, characterized in that, The Abbe number of the first lens is VD1, where VD1 > 75, and the Abbe number of the second lens is VD2, where VD2 < 40.

3. The camera module according to claim 1, characterized in that, The camera module further includes a lens group, which is disposed between the second lens and the image sensor; The lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially, with the first lens disposed between the second lens portion and the second lens. The first lens has positive optical power, the second lens has negative optical power, and the Abbe number of the first lens is greater than the Abbe number of the second lens; The third lens has negative optical power, the fourth lens has positive optical power, the Abbe number of the third lens is less than the Abbe number of the fourth lens, and the Abbe number of the fourth lens is less than the Abbe number of the first lens.

4. The camera module according to claim 3, characterized in that, The Abbe number of the first lens is VD3, where VD3 > 75; the Abbe number of the second lens is VD4, where 40 < VD4 < 60; the Abbe number of the third lens is VD5, where VD5 < 40; and the Abbe number of the fourth lens is VD6, where 40 < VD6 < 60. And / or, the difference in Abbe number between the first lens and the second lens is greater than or equal to 25; the difference in Abbe number between the third lens and the fourth lens is greater than or equal to 25.

5. The camera module according to claim 3, characterized in that, The first lens is a glass lens; The second lens, the third lens, and the fourth lens are all resin lenses, and the object-side surface and the image-side surface of the second lens, the third lens, and the fourth lens are all aspherical.

6. The camera module according to claim 3, characterized in that, The lens group includes a first lens group and a second lens group, the second lens group being disposed between the first lens group and the image sensor, and one of the first lens group and the second lens group being movable along the optical axis; The first lens, the second lens, the third lens, and the fourth lens are combined to form the first lens group.

7. The camera module according to claim 6, characterized in that, The second lens group includes a fifth lens, a sixth lens, and a seventh lens arranged sequentially, with the fifth lens positioned between the fourth lens and the sixth lens. The fifth lens has negative optical power, the sixth lens has positive optical power, and the seventh lens has negative optical power; or, the fifth lens has positive optical power, the sixth lens has negative optical power, and the seventh lens has negative optical power.

8. The camera module according to claim 7, characterized in that, The Abbe number of the fifth lens is VD7, where VD7 > 40; the Abbe number of the sixth lens is VD8, where VD8 < 40; and the Abbe number of the seventh lens is VD9, where VD9 > 40.

9. The camera module according to claim 1, characterized in that, The first optical path deflector includes a total internal reflection prism, the first mirror is connected to one right-angle side of the total internal reflection prism, and the second mirror is connected to the other right-angle side of the total internal reflection prism; The surface of the first mirror portion away from the total internal reflection prism is convex. The surface of the second mirror portion away from the total reflection prism is concave.

10. An electronic device, characterized in that, include: case; A camera module, wherein the camera module is any one of claims 1-9, and the camera module is mounted on the housing.

Images