Optical lens and packaging structure therefor, camera module and electronic device

Abstract

An optical lens (100) and a packaging structure (200) therefor, a camera module (10) and an electronic device (1), which relate to the technical field of cameras, configured to reduce the size of the optical lens (100). The optical lens (100) comprises the following arranged in sequence from an object side to an image side: a lens (110) having a positive focal power, a first light-redirecting member (210) comprising a free-form surface, a second light-redirecting member (220) comprising a free-form surface, and a third light-redirecting member (230) comprising a free-form surface. The first light-redirecting member (210) is configured to reflect light rays from the lens (110) multiple times, and transmit the reflected light rays to the second light-redirecting member (220). The second light-redirecting member (220) is configured to transmit the light rays from the first light-redirecting member (210) to the third light-redirecting member (230). The third light-redirecting member (230) is configured to reflect the light rays from the second light-redirecting member (220) multiple times, and transmit the reflected light rays. The light rays emitted from the lens (110) sequentially pass through the free-form surface of the first light-redirecting member (210), the free-form surface of the second light-redirecting member (220), and the free-form surface of the third light-redirecting member (230), and are then transmitted.

Description

Optical lens, packaging structure thereof, camera module and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202421636311.2, filed on July 10, 2024, and entitled "Optical lens, packaging structure thereof, camera module and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of camera technology, and in particular to an optical lens, a packaging structure thereof, a camera module and an electronic device. BACKGROUND

[0003] With the development of electronic devices, people's requirements for photography are also getting higher and higher. In order to meet people's photography experience, long focal length lenses are gradually applied to electronic devices.

[0004] However, due to the large size of the long focal length lens and the size limitation of the electronic device, the application of the long focal length lens is limited. SUMMARY

[0005] The present application provides an optical lens, a packaging structure thereof, a camera module and an electronic device, which are used to reduce the size of the optical lens.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides an optical lens, comprising, in order from an object side to an image side, a lens having a positive refractive power, a first light folding member comprising a free-form surface, a second light folding member comprising a free-form surface, and a third light folding member comprising a free-form surface. The first light folding member is configured to reflect light from the lens multiple times and transmit the reflected light to the second light folding member. The second light folding member is configured to transmit light from the first light folding member to the third light folding member. The third light folding member is configured to reflect light from the second light folding member multiple times and transmit the reflected light. Wherein the light emitted from the lens passes through the free-form surface of the first light folding member, the free-form surface of the second light folding member and the free-form surface of the third light folding member in order and is then transmitted.

[0008] The optical lens provided in the embodiments of the present application is capable of folding the optical path, reducing the size of the optical lens, and realizing miniaturization of the optical lens. The optical lens provided in the embodiments of the present application comprises a plurality of free-form surfaces, and the transmission of the light through the plurality of free-form surfaces can increase the aberration correction degree of freedom, thereby realizing a larger light flux and increasing the imaging size of the optical lens under the premise of ensuring the imaging quality.

[0009] In a possible implementation, the first light-turning element comprises a first incident surface, a first exit surface and a first reflection surface; the first incident surface is arranged towards the lens, and the first exit surface is arranged towards the second light-turning element; the first incident surface, the first exit surface and the first reflection surface all intersect; at least one of the first incident surface, the first exit surface and the first reflection surface is a free-form surface; the first incident surface is configured to transmit the light from the lens to the first reflection surface; the first reflection surface is configured to reflect at least part of the light from the first incident surface to the first incident surface; the first incident surface is further configured to reflect at least part of the light from the first reflection surface to the first exit surface; and the first exit surface is configured to transmit at least part of the light from the first incident surface to the second light-turning element. In this way, the light can be folded multiple times in the first light-turning element, thereby reducing the size of the optical lens.

[0010] In a possible implementation, the second light-turning element comprises a second incident surface and a second exit surface; the second incident surface is arranged towards the first light-turning element, and the second exit surface is arranged towards the third light-turning element; the second incident surface or the second exit surface is a free-form surface; the second incident surface is configured to transmit the light from a light-turning element to the second exit surface; and the second exit surface is configured to transmit at least part of the light from the second incident surface to the third light-turning element. In this way, the light can pass through the free-form surface, thereby well balancing the chromatic aberration and the field curvature of the optical lens.

[0011] In a possible implementation, the third light-turning piece includes a third incident surface, a third exit surface, and a third reflection surface; the third incident surface is arranged towards the second light-turning piece; the third incident surface, the third exit surface, and the third reflection surface all intersect; at least one of the third incident surface, the third exit surface, and the third reflection surface is a free-form surface; the third incident surface is configured to transmit the light from the second light-turning piece to the third exit surface; the third exit surface is configured to reflect at least part of the light from the third incident surface to the third reflection surface; the third reflection surface is configured to reflect at least part of the light from the third exit surface to the third exit surface; and the third exit surface is further configured to transmit at least part of the light from the third reflection surface. In this way, the light can be turned multiple times in the third light-turning piece, thereby reducing the size of the optical lens.

[0012] In a possible implementation, all the surfaces of the first light-turning piece are free-form surfaces. In this way, the chromatic aberration and the field curvature of the optical lens can be further balanced.

[0013] In a possible implementation, all the surfaces of the second light-turning piece are free-form surfaces. In this way, the chromatic aberration and the field curvature of the optical lens can be further balanced.

[0014] In a possible implementation, all the surfaces of the third light-turning piece are free-form surfaces. In this way, the chromatic aberration and the field curvature of the optical lens can be further balanced.

[0015] In a possible implementation, at least one of the surfaces of the first light-turning piece is an off-axis non-rotationally symmetric free-form surface. In this way, the aberration can be corrected, and the design freedom is improved.

[0016] In a possible implementation, at least one of the surfaces of the second light-turning piece is an off-axis non-rotationally symmetric free-form surface. In this way, the aberration can be corrected, and the design freedom is improved.

[0017] In a possible implementation, at least one of the surfaces of the third light-turning piece is an off-axis non-rotationally symmetric free-form surface. In this way, the aberration can be corrected, and the design freedom is improved.

[0018] In a possible implementation, the refractive index n0 of the light in the lens, the refractive index n1 of the light in the first light-turning piece, the refractive index n2 of the light in the second light-turning piece, and the refractive index n3 of the light in the third light-turning piece satisfy: n1 < n2 < n0 < n3. In this way, the chromatic aberration and the field curvature can be balanced, the aperture of the optical lens can be increased, and the size of the optical lens can be reduced.

[0019] In a possible implementation, the object side surface and the image side surface of the lens are aspheric surfaces. In this way, aberration can be balanced, the incidence angle of light can be adjusted, the design freedom of the optical lens can be increased, and the imaging effect can be improved.

[0020] In a possible implementation, the object side surface and the image side surface of the lens are rotationally symmetric surfaces. In this way, the imaging effect can be improved, and aberration can be reduced.

[0021] In a possible implementation, the object side surface of the lens is a convex surface. In this way, the imaging effect is good, and the imaging quality can be improved.

[0022] In a possible implementation, the first light folding member includes a first incident surface, a first exit surface, and a first reflection surface; the first incident surface is arranged towards the lens, and the first exit surface is arranged towards the second light folding member; the second light folding member includes a second incident surface and a second exit surface; the second incident surface is arranged towards the first light folding member, and the second exit surface is arranged towards the third light folding member; the third light folding member includes a third incident surface, a third exit surface, and a third reflection surface; the third incident surface is arranged towards the second light folding member; the first exit surface and the second incident surface are attached, and the second exit surface and the third incident surface are attached. In this way, the assembly difficulty can be reduced.

[0023] In a possible implementation, the first light folding member includes a prism. In this way, an implementation of the optical lens is provided.

[0024] In a possible implementation, the second light folding member includes a prism. In this way, an implementation of the optical lens is provided.

[0025] In a possible implementation, the third light folding member includes a prism. In this way, an implementation of the optical lens is provided.

[0026] The optical lens provided in the second aspect of the embodiments of the present application includes, in order from the object side to the image side, a lens with positive refractive power, a first light folding member with a free-form surface, and a third light folding member with a free-form surface. The first light folding member is configured to reflect light from the lens multiple times and transmit the reflected light to the third light folding member. The third light folding member is configured to reflect light from the first light folding member multiple times and transmit the reflected light. The first light folding member and the third light folding member are attached. Light emitted from the lens is transmitted after passing through the free-form surface of the first light folding member and the free-form surface of the third light folding member in order.

[0027] The optical lens provided in the embodiments of the present application is capable of folding the optical path, reducing the size of the optical lens, and realizing miniaturization of the optical lens, because the light is reflected multiple times in the first light-turning element and the third light-turning element. In addition, the first light-turning element and the third light-turning element are attached to each other, which can further reduce the size of the optical lens and reduce the assembly difficulty. The optical lens provided in the embodiments of the present application includes multiple free-form surfaces, and the transmission of the light through the multiple free-form surfaces can increase the aberration correction degree of freedom, thereby realizing a larger light flux and increasing the imaging size of the optical lens under the premise of ensuring the imaging quality.

[0028] In a possible implementation, the first light-turning element includes a first incident surface, a first exit surface, and a first reflection surface; the first incident surface is arranged towards the lens, the first exit surface is arranged towards the second light-turning element, and the first incident surface, the first exit surface, and the first reflection surface all intersect with each other; at least one of the first incident surface, the first exit surface, and the first reflection surface is a free-form surface; the first incident surface is configured to transmit the light from the lens to the first reflection surface; the first reflection surface is configured to reflect at least part of the light from the first incident surface to the first incident surface; the first incident surface is further configured to reflect at least part of the light from the first reflection surface to the first exit surface; and the first exit surface is configured to transmit at least part of the light from the first incident surface to the second light-turning element. The third light-turning element includes a third incident surface, a third exit surface, and a third reflection surface; the third incident surface is arranged towards the second light-turning element; the third incident surface, the third exit surface, and the third reflection surface all intersect with each other; at least one of the third incident surface, the third exit surface, and the third reflection surface is a free-form surface; the third incident surface is configured to transmit the light from the second light-turning element to the third exit surface; the third exit surface is configured to reflect at least part of the light from the third incident surface to the third reflection surface; the third reflection surface is configured to reflect at least part of the light from the third exit surface to the third exit surface; and the third exit surface is further configured to transmit at least part of the light from the third reflection surface. The first exit surface and the third incident surface are attached to each other. In this way, the assembly difficulty can be reduced.

[0029] In a possible implementation, the refractive index n0 of the light in the lens, the refractive index n1 of the light in the first light-turning element, and the refractive index n3 of the light in the third light-turning element satisfy: n1 < n0 < n3. In this way, the chromatic aberration and the field curvature can be balanced, the aperture of the optical lens can be increased, and the size of the optical lens can be reduced.

[0030] The third aspect of the embodiment of the present application provides the camera module, including a packaging structure, an optical sensor and the optical lens of any one of the first aspect and the second aspect; the optical sensor is arranged on the image side of the optical lens; and the optical lens is arranged in the packaging structure. The packaging structure includes a lens barrel provided with a receiving cavity and a guide rail arranged on the inner side of the lens barrel. The side wall of the lens barrel is provided with a limiting hole, the limiting hole penetrates the side wall of the lens barrel and is in communication with the receiving cavity. The receiving cavity is used for placing the light folding piece of the optical lens, and the limiting hole is used for placing the lens of the optical lens. The guide rail is used for connecting the light folding piece, so that the light folding piece can move along the extension direction of the lens barrel.

[0031] The third aspect of the embodiment of the present application provides the camera module, including the optical lens of any one of the first aspect and the second aspect, and the beneficial effects are the same as those of the optical lens, which will not be repeated here. In addition, the packaging structure of the embodiment of the present application is simple in structure, the light folding piece is fixed on the lens barrel through the guide rail, which is convenient for assembly and has strong applicability.

[0032] In a possible implementation manner, the packaging structure further includes a light blocking sheet; and the light blocking sheet is arranged on the outer side of the lens barrel. In this way, the interference light is prevented from being incident on the optical lens.

[0033] In a possible implementation manner, the side wall of the lens barrel is further provided with a light outlet hole; the packaging structure further includes a light filter; and the light filter is arranged in the light outlet hole. In this way, the unnecessary wave band in the light is filtered out, the false color or the ripple of the photosensitive element is prevented, and the effective resolution and the color restoration are improved.

[0034] The fourth aspect of the embodiment of the present application provides an electronic device, including the camera module of the third aspect and a printed circuit board; and the camera module and the printed circuit board are electrically connected.

[0035] The electronic device provided by the fourth aspect of the embodiment of the present application includes the camera module of the third aspect, and the beneficial effects are the same as those of the camera module, which will not be repeated here.

[0036] The fifth aspect of the embodiment of the present application provides a packaging structure, including a lens barrel provided with a receiving cavity and a guide rail arranged on the inner side of the lens barrel. The side wall of the lens barrel is provided with a limiting hole, the limiting hole penetrates the side wall of the lens barrel and is in communication with the receiving cavity. The receiving cavity is used for placing the light folding piece of the optical lens, and the limiting hole is used for placing the lens of the optical lens. The guide rail is used for connecting the light folding piece, so that the light folding piece can move along the extension direction of the lens barrel.

[0037] The packaging structure provided by the embodiment of the present application is simple in structure, the light folding piece is fixed on the lens barrel through the guide rail, which is convenient for assembly and has strong applicability. BRIEF DESCRIPTION OF DRAWINGS

[0038] FIG. 1A is a structural schematic diagram of an electronic device provided by the embodiment of the present application;

[0039] FIG. 1B is a structural schematic diagram of a camera module according to an embodiment of the present application;

[0040] FIG. 2A is a schematic diagram of imaging of a camera module according to an embodiment of the present application;

[0041] FIG. 2B is a schematic diagram of imaging of another camera module according to an embodiment of the present application;

[0042] FIG. 3A is a structural schematic diagram of an optical lens according to an embodiment of the present application;

[0043] FIG. 3B is a structural schematic diagram of another electronic device according to an embodiment of the present application;

[0044] FIG. 4 is a schematic diagram of a periscopic light path structure according to an embodiment of the present application;

[0045] FIG. 5 is a structural schematic diagram of another optical lens according to an embodiment of the present application;

[0046] FIG. 6 is a structural schematic diagram of still another optical lens according to an embodiment of the present application;

[0047] FIG. 7 is a structural schematic diagram of still another optical lens according to an embodiment of the present application;

[0048] FIG. 8A is a modulation transfer function curve of the optical lens shown in FIG. 6;

[0049] FIG. 8B is a distortion grid diagram of the optical lens shown in FIG. 6;

[0050] FIG. 9 is a structural schematic diagram of still another optical lens according to an embodiment of the present application;

[0051] FIG. 10 is a structural schematic diagram of still another optical lens according to an embodiment of the present application;

[0052] FIG. 11A is a modulation transfer function curve of the optical lens shown in FIG. 9;

[0053] FIG. 11B is a distortion grid diagram of the optical lens shown in FIG. 9;

[0054] FIG. 12A is a structural schematic diagram of a packaging structure of an optical lens according to an embodiment of the present application;

[0055] FIG. 12B is an exploded view of FIG. 12A;

[0056] FIG. 13 is a flow schematic diagram of a packaging method of an optical lens according to an embodiment of the present application.

[0057] 1 - electronic device; 2 - display module; 3 - middle frame; 4 - shell; 5 - cover plate; 10 - camera module; 20 - photosensitive element; 30 - filter; 100 - optical lens; 110 - lens; 210 - first light folding piece; 211 - first incident surface; 212 - first exit surface; 213 - first reflection surface; 220 - second light folding piece; 221 - second incident surface; 222 - second exit surface; 230 - third light folding piece; 231 - third incident surface; 232 - third exit surface; 233 - third reflection surface; 200 - packaging structure of optical lens; 310 - lens barrel; 311 - accommodating cavity; 312 - limiting hole; 313 - light exit hole; 320 - guide rail; 330 - light blocking piece; 340 - filter. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0059] Hereinafter, the terms "second", "first", and the like are only used for description convenience, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "second", "first", and the like can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0060] In addition, in the embodiments of the present application, the orientation terms such as "upper", "lower", "left", "right", and the like can include but not limited to the orientation defined by the relative placement of the components in the drawings. It should be understood that these directional terms can be relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the placement of the components in the drawings.

[0061] In the embodiments of the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through intermediate medium. In addition, the term "coupling" can be direct electrical connection, or indirect electrical connection through intermediate medium. The term "contact" can be direct contact, or indirect contact through intermediate medium.

[0062] In the embodiments of the present application, "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone, wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects.

[0063] For the convenience of understanding the technical solutions, the technical terms involved in the present application are explained as follows.

[0064] Image side: the side of the image plane; Object side: the side of the object plane.

[0065] Focal power: the difference between the convergence of the image beam and the convergence of the object beam, representing the refractive power of the optical system to the incident parallel light beam. Focal power is generally represented by φ, the larger the value of φ, the more the parallel light beam is folded. When φ>0, the refraction is convergent; when φ<0, the refraction is divergent. When φ=0, it is a plane refraction, that is, the parallel light beam along the axis is still a parallel light beam after refraction, and no refraction phenomenon occurs.

[0066] Thickness of the lens: the thickness of the lens on the optical axis is the thickness of the lens.

[0067] Focal length (f): also known as focal length, is a measure of the convergence or divergence of light in an optical system, which refers to the vertical distance from the optical center of the lens or lens group to the imaging plane when the lens or lens group forms a clear image on the imaging plane.

[0068] Effective focal length (EFL): the distance between the back principal plane of the lens or lens group and the imaging plane. For thin lenses, the focal length is the distance from the lens center to the imaging plane; for thick lenses or lens groups, the focal length is equal to the effective focal length.

[0069] Back focal length (BFL): also known as back focal distance, which refers to the distance from the lens closest to the image side to the imaging plane of the optical lens.

[0070] Telephoto ratio: the ratio of the total optical length to the focal length. The smaller the telephoto ratio, the shorter the size of the optical system can achieve a longer focal length.

[0071] Optical axis: a light ray perpendicular to the center of the ideal lens. When the light rays parallel to the optical axis enter the convex lens, the ideal convex lens should converge all the light rays to a point behind the lens. The point where all light rays converge is called the focal point.

[0072] Positive focal power: the lens or lens group has a positive focal length and has the effect of converging light rays.

[0073] Negative focal power: the lens or lens group has a negative focal length and has the effect of diverging light rays.

[0074] Chief ray: the light ray passing through the center of the entrance pupil and the center of the exit pupil.

[0075] Optical axis: a light ray perpendicular to the center of the ideal lens. When a light ray parallel to the optical axis enters a convex lens, the ideal convex lens should converge all the light rays to a point behind the lens. The point where all the light rays converge is the focal point.

[0076] Freeform surface: a surface that cannot be continuously machined and has the arbitrary characteristics of traditional machining.

[0077] Aspheric surface: a surface with continuously changing curvature.

[0078] Center axis of the mirror: an axis parallel to the geometric center and the rotationally symmetric axis of the mirror.

[0079] Off-axis: the optical axis does not coincide with the center axis.

[0080] Rotationally symmetric axis: a straight line that can make the geometric figure form a central axis symmetry or rotational symmetry. The geometric figure formed by rotating 360° along this straight line is a rotationally symmetric figure, and this straight line is the rotationally symmetric axis.

[0081] Rotationally symmetric structure: a structure formed by rotating the geometric figure 360° around the rotationally symmetric axis.

[0082] Non-rotationally symmetric structure: a structure that cannot be obtained by rotating a line.

[0083] Clear aperture: the projection of the entrance pupil of the mirror along the center axis of the mirror.

[0084] Mirror off-axis amount: also known as mirror offset, the distance between the geometric center of the mirror and the rotationally symmetric axis. That is, the distance between the center axis of the mirror and the rotationally symmetric axis.

[0085] Total track length (TTL) of the lens: the length on the optical axis from the object side of the first optical element on the object side to the imaging plane is the total track length. That is, the total length from the lens barrel head to the imaging plane is the main factor in determining the height of the camera. The total track length is used to represent the size of the lens.

[0086] Aperture stop: a device used to control the amount of light that enters the camera body through the lens and reaches the light-sensitive surface. The aperture number F# is the relative value (the reciprocal of the relative aperture) obtained by dividing the focal length of the lens by the diameter of the lens. The smaller the aperture number F#, the more light enters in the same unit of time, allowing the lens to be used effectively in low-light environments. The larger the aperture number F#, the smaller the depth of field, and the background will be blurred.

[0087] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings.

[0088] An electronic device is provided in the embodiments of the present application. The electronic device may, for example, be a consumer electronic product, a home electronic product, or a vehicle-mounted electronic product, etc. with a photographing or video shooting function. The consumer electronic product may, for example, be a mobile phone, a pad, a notebook computer, a personal computer (PC), a personal digital assistant (PDA), a desktop display, a smart wearable product (for example, a smart watch, a smart bracelet), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a drone, etc. The home electronic product may, for example, be a smart door lock, a television, etc. The vehicle-mounted electronic product may, for example, be a vehicle-mounted navigation device, a vehicle-mounted DVD, etc. The embodiments of the present application do not specially limit the specific form of the electronic device. The following embodiments are described by taking a mobile phone as an example for the convenience of description.

[0089] An example structure of an electronic device is shown in FIG. 1A. The electronic device 1 mainly includes a display module 2, a middle frame 3, a shell (or referred to as a battery cover, a back shell) 4, and a cover plate 5.

[0090] The display module 2 has a light-out side at which a display image can be seen and a non-light-out side opposite to the light-out side. The back of the display module 2 is close to the middle frame 3, and the cover plate 5 is arranged at the light-out side of the display module 2.

[0091] The display module 2 includes a display panel (DP).

[0092] In a possible embodiment of the present application, the display module 2 is a liquid crystal display module. In this case, the display panel is a liquid crystal display (LCD). Based on this, the display module 2 further includes a back light unit (BLU) at the back of the liquid crystal display panel (far from the side of the LCD for displaying an image).

[0093] The back light unit can provide light (also referred to as back light) to the liquid crystal display panel. Each sub pixel in the liquid crystal display panel can control the transmittance of the light to realize image display.

[0094] Alternatively, in another possible embodiment of the present application, the display module 2 is an organic light emitting diode display module. In this case, the display screen is an organic light emitting diode (OLED) display screen. Since an electroluminescent layer is arranged in each sub-pixel of the OLED display screen, the OLED display screen can realize self-luminescence after receiving a working voltage. In this case, the display module 2 with the OLED display screen no longer needs to be provided with the backlight module.

[0095] The cover plate 5 is located on the side of the display module 2 away from the middle frame 3. The cover plate 5 can be a cover glass (CG) for example, which can have a certain toughness.

[0096] The middle frame 3 is located between the display module 2 and the shell 4. The surface of the middle frame 3 away from the display module 2 is used to mount internal components such as a battery, a printed circuit board (PCB), a camera, an antenna, and the like. After the shell 4 is covered with the middle frame 3, the above-mentioned internal components are located between the shell 4 and the middle frame 3.

[0097] In some embodiments, the electronic device 1 further includes electronic devices such as a central processing unit (CPU) chip, a radio frequency chip, a radio frequency power amplifier (PA), a system on a chip (SOC), a power management integrated circuit (PMIC), a storage chip (such as a high bandwidth memory (HBM)), an audio processor, a touch screen controller, a NAND flash, an image processor, a camera, and a microphone, which are arranged on a printed circuit board. The printed circuit board is used to carry the above-mentioned electronic devices and complete signal interaction with the above-mentioned electronic devices.

[0098] For example, the image processor is in communication connection with the camera. The image processor is used to obtain image data from the camera and process the image data. The communication connection between the camera and the image processor can include data transmission through electrical connection such as wiring, or data transmission through coupling. It can be understood that the camera and the image processor can also be in communication connection through other ways capable of realizing data transmission.

[0099] The image processor optimizes the digital image signal and transmits the processed signal to the display module 2. The image processor can be an image processing chip or a digital signal processing chip, which functions to quickly transmit the data obtained by the photosensitive chip to the processor chip and refresh the photosensitive chip, and thus the performance of the image processor directly affects the picture quality (such as color saturation, definition, etc.).

[0100] The camera is an indispensable part of the electronic device 1. In some embodiments, the camera of the electronic device 1 includes a first camera and a second camera. For example, the first camera is a front camera of the electronic device and is arranged on the printed circuit board close to the display module 2. The second camera is a rear camera of the electronic device 1 and is arranged on the printed circuit board close to the housing 4. The number and arrangement position of the camera in the embodiments of the present application are not limited, and can be reasonably arranged according to the actual situation.

[0101] Based on this, the embodiments of the present application also provide a camera module, which is any one of the cameras included in the electronic device 1 described above. As shown in FIG. 1B, the camera module 10 includes an optical lens 100, a photosensitive element 20, and a filter 30.

[0102] As shown in FIG. 1B, the photosensitive element 20 is arranged on the image side of the optical lens 100. For example, the photosensitive element 20 is arranged on the focal plane of the optical lens 100 to present a clear image.

[0103] For example, the photosensitive element 20 can include an optical sensor. For example, the optical sensor is an image sensor.

[0104] In some embodiments, as shown in FIG. 1B, the camera module 10 further includes a filter 30. The filter 30 is arranged between the optical lens 100 and the photosensitive element 20.

[0105] For example, the filter 30 is used to filter out unnecessary wave bands in light, prevent the photosensitive element 20 from generating false colors or moire, and improve the effective resolution and color restoration.

[0106] The optical lens 100 mainly uses the refraction principle of the lens to form an image, that is, the light passes through the optical lens to form a clear image on the focal plane, and forms an image through the photosensitive element 20 located on the focal plane.

[0107] In order to enable the electronic device 1 to shoot objects at different distances, the camera of the electronic device 1 can include a short-focus optical lens (a main camera of the electronic device 1) and a long-focus optical lens. The short-focus optical lens is used to shoot objects at a relatively close distance, and the long-focus optical lens is used to shoot objects at a relatively far distance.

[0108] For example, as shown in FIG. 2A, when the distance between the photographed object and the electronic device 1 is relatively short, a short-focus optical lens (the main camera of the electronic device 1) is used for imaging, and the effective focal length can be about 7 mm, for example. Alternatively, for example, as shown in FIG. 2B, when the distance between the photographed object and the electronic device 1 is relatively long, a long-focus optical lens is used for imaging, and the effective focal length can be greater than 20 mm, for example. In this way, the same object can be imaged with substantially the same size at different distances.

[0109] As users have higher and higher requirements for the photographing performance of the electronic device 1, it has become a development trend of the camera module to use a long-focus optical lens. Based on this, as shown in FIG. 3A, an optical lens 100 is used to meet the requirements of medium and long-focus photography.

[0110] However, the imaging of the long-focus optical lens will stretch the axial length of the optical lens, increase the size of the optical lens, cause the total track length (TTL) of the optical lens to be large, and cause the size of the optical lens 100 to be large. The photosensitive element 20 is arranged on the focal plane of the optical lens 100, which will cause the size of the camera module 10 to be larger.

[0111] Meanwhile, as users have higher and higher requirements for the performance and structure of the electronic device 1, in order to make the electronic device 1 thinner, the printed circuit board in the electronic device 1 needs to be arranged as close to the display module 2 and the shell 4 as possible. However, as the existing electronic device 1 gradually develops towards a narrow frame or even a frameless design, the display module 2 and the shell 4 are very close to the profile edge of the middle frame 3. Therefore, the application of the above-mentioned camera module 10 in the electronic device 1 contradicts the development trend of the electronic device 1 towards thinness.

[0112] In order to apply the camera module 10 to the thin electronic device 1, the increase in the size of the optical lens 100 will cause the camera module 10 of the electronic device 1 to protrude, as shown in FIG. 3B, the size of the camera module 10 protruding from the shell 4 is greater than 4 mm, which affects the appearance of the electronic device 1 and the user experience.

[0113] Based on this, in order to reduce the size of the camera module 10, the optical lens 100 can adopt a periscopic design. For example, one or more mirrors can be arranged on the optical path to change the propagation direction of the light and fold the optical path. As shown in FIG. 4, a mirror is placed on the optical path, and the included angle between the mirror and the optical axis is 45°, which can make the transmission angle of the light turn 90°. In this way, the size of the optical lens 100 in the thickness direction of the electronic device 1 can be reduced.

[0114] In some embodiments, the optical lens 100 can include an upright lens and a periscope lens. For example, FIG. 3A schematically shows an upright lens. In the upright lens, the optical axis direction is parallel to the thickness direction of the electronic device 1, while in the periscope lens, the optical axis direction intersects the thickness direction of the electronic device 1, and the periscope lens can be better applied to a thin and light electronic device 1.

[0115] FIG. 5 schematically shows a periscope optical lens. The optical lens 100 includes a prism and a plurality of lenses. The prism is arranged on the object side and the image side of the plurality of lenses, respectively. The incident light is reflected by the prism, then enters the plurality of lenses, and then is emitted after being reflected by the prism again.

[0116] Here, it is explained that the prism is used to fold the optical path to reduce the size of the optical lens 100 without generating optical power. The lens is used to generate optical power. The number of lenses in the embodiments of the present application is not limited, for example, optical power can be generated by 5, 6 or 7 lenses. The plurality of lenses are coaxially arranged. Here, it is explained that in actual cases, the optical axes of the lenses may

[0117] In this way, the optical axis direction of the optical lens 100 can be changed by the prism, so that the optical axis of the incident light intersects the optical axis of the plurality of lenses, and the size of the optical lens 100 is reduced.

[0118] With the development of technology, the optical lens 100 gradually develops towards a larger light aperture and a larger imaging size. Due to the existence of the mirror, the size and the light aperture of the periscope lens are close, which makes it difficult to reduce the size of the optical lens 100 (the size of the optical lens 100 shown in FIG. 5 is greater than 11 mm).

[0119] Therefore, in order to further reduce the size of the periscope optical lens, the embodiments of the present application provide an optical lens applied to the above-mentioned camera module 10. As shown in FIG. 6, the optical lens 100 includes a lens 110, a first light folding member 210, a second light folding member 220 and a third light folding member 230 arranged in sequence from the object side to the image side.

[0120] For example, the lens 110 is used to converge light and transmit the converged light to the first light folding member 210. The first light folding member 210 is used to reflect the light from the lens 110 multiple times and transmit the reflected light to the second light folding member 220. The second light folding member 220 is used to transmit the light from the first light folding member 210 to the third light folding member 230. The third light folding member 230 is used to reflect the light from the second light folding member 220 multiple times and transmit the reflected light.

[0121] That is, the light rays are incident to the lens 110, then transmitted to the first light folding member 210 after being converged by the lens 110. Then the light rays are transmitted to the second light folding member 220 after being reflected multiple times in the first light folding member 210. Next, the light rays are transmitted after passing through the second light folding member 220, and then transmitted to the third light folding member 230. Finally, the light rays are transmitted after being reflected multiple times in the third light folding member 230.

[0122] The first light folding member 210, the second light folding member 220 and the third light folding member 230 each include a free-form surface. The light rays emitted from the lens 110 are transmitted after passing through the free-form surfaces of the first light folding member 210, the second light folding member 220 and the third light folding member 230 in sequence.

[0123] Here, it is clarified that the free-form surface is a surface shape that cannot be continuously machined, and has the characteristic of being arbitrary in traditional machining.

[0124] In the first light folding member 210 and the third light folding member 230, the light rays are reflected multiple times when transmitted, which can fold the optical path, reduce the size of the optical lens 100, and realize miniaturization of the optical lens 100. For example, the size of the optical lens 100 can be reduced by more than 30%, which reduces the size of the part of the camera module 10 protruding from the electronic device 1 or makes the camera module 10 flush with the shell of the electronic device 1, thereby improving the user experience of the electronic device 1.

[0125] In the first light folding member 210 and the third light folding member 230, the light rays are reflected multiple times when transmitted, which can fold the optical path, reduce the size of the optical lens 100, and realize miniaturization of the optical lens 100. For example, the size of the optical lens 100 can be reduced by more than 30%, which reduces the size of the part of the camera module 10 protruding from the electronic device 1 or makes the camera module 10 flush with the shell of the electronic device 1, thereby improving the user experience of the electronic device 1.

[0126] For example, as shown in FIG. 6, the optical lens 100 can include one lens.

[0127] Alternatively, for example, the optical lens 100 can include multiple lenses, i.e., a lens group.

[0128] The number of lenses included in the optical lens 100 in the embodiments of the present application is not limited, and can be reasonably set according to actual conditions.

[0129] In the embodiments of the present application, when the optical lens 100 includes multiple lenses, the lenses are coaxially arranged. For example, the multiple lenses are arranged along the optical axis in sequence.

[0130] Each lens includes an object side surface facing the object side and an image side surface facing the image side.

[0131] It can be understood that the object side surface of any one of the plurality of lenses can be any one of a convex surface, a concave surface or a flat surface. The image side surface of any one of the plurality of lenses can also be any one of a convex surface, a concave surface or a flat surface. The embodiments of the present application do not limit this, and reasonable settings can be made according to actual conditions.

[0132] Here, it is clarified that the optical power of each lens in the embodiments of the present application is not limited, and only the lens 110 needs to have positive optical power.

[0133] The plurality of lenses in the embodiments of the present application are lenses with positive optical power or negative optical power. When a plane mirror is inserted between the plurality of lenses, the plane mirror is not counted as a lens of the optical lens 100 of the present application.

[0134] The following is described for convenience with the optical lens 100 including one lens.

[0135] For example, the object side surface and the image side surface of the lens 110 are both aspheric surfaces.

[0136] In this way, the aberration can be balanced, the incidence angle of light can be adjusted, the design freedom of the optical lens 100 can be increased, and the imaging quality can be improved.

[0137] For example, the object side surface and the image side surface of the lens 110 are both rotationally symmetric surfaces.

[0138] For example, the object side surface and the image side surface of the lens 110 are both rotationally symmetric aspheric surfaces.

[0139] In this way, the imaging effect can be improved, and the aberration can be reduced.

[0140] For example, the object side surface of the lens 110 is a convex surface.

[0141] In this way, the imaging effect is good, and the imaging quality can be improved.

[0142] Regarding the first light folding member 210, with continued reference to FIG. 6, the first light folding member 210 includes a first incident surface 211, a first exit surface 212 and a first reflecting surface 213. The first incident surface 211, the first exit surface 212 and the first reflecting surface 213 all intersect.

[0143] For example, the first light folding member 210 can include a prism. For example, the prism can include any one of a three-prism, a four-prism or a five-prism. That is, the first incident surface 211, the first exit surface 212 and the first reflecting surface 213 can serve as any three intersecting sides of the prism.

[0144] Alternatively, for example, the first light folding member 210 can be a combination of the first incident surface 211, the first exit surface 212 and the first reflecting surface 213.

[0145] As shown in FIG. 6, the first incident surface 211 is arranged towards the lens 110, and the first exit surface 212 is arranged towards the second light-turning piece 220.

[0146] For example, the first incident surface 211 is configured to transmit the light from the lens 110 to the first reflecting surface 213, the first reflecting surface 213 is configured to reflect at least part of the light from the first incident surface 211 to the first incident surface 211, the first incident surface 211 is further configured to reflect at least part of the light from the first reflecting surface 213 to the first exit surface 212, and the first exit surface 212 is configured to transmit at least part of the light from the first incident surface 211 to the second light-turning piece 220.

[0147] That is, as shown in FIG. 7, the light from the lens 110 is incident to the first incident surface 211 of the first light-turning piece 210, and then is transmitted to the first reflecting surface 213 of the first light-turning piece 210. Then the light is reflected by the first reflecting surface 213 and is transmitted to the first incident surface 211 of the first light-turning piece 210. Then the light is reflected by the first incident surface 211 and is transmitted to the first exit surface 212. Finally, the light is transmitted by the first exit surface 212.

[0148] The first reflecting surface 213 can be configured to reflect part of the light from the first incident surface 211 to the first incident surface 211, or can be configured to reflect all the light from the first incident surface 211 to the first incident surface 211, which is related to the incident angle of the light incident to the first reflecting surface 213. The first incident surface 211 can be configured to reflect part of the light from the first reflecting surface 213 to the first exit surface 212, or can be configured to reflect all the light from the first incident surface 211 to the first exit surface 212, which is related to the incident angle of the light incident to the first incident surface 211.

[0149] Here, it is explained that the first reflecting surface 213 and the first incident surface 211 are both reflecting surfaces, and the reflecting surfaces are reflecting surfaces that can transmit light when the light is incident at a preset angle. For example, when the incident angle of the light is greater than or equal to the preset angle, the light can be totally reflected (TIR), that is, the light is reflected by the reflecting surface. When the incident angle of the light is less than the preset angle, the light is transmitted by the reflecting surface.

[0150] When the light is transmitted to the first reflecting surface 213 from the first incident surface 211, the incident angle of the light on the first reflecting surface 213 is greater than or equal to the preset angle, and the light is totally reflected by the first reflecting surface 213. When the light is transmitted to the first incident surface 211 from the first reflecting surface 213, the incident angle of the light on the first incident surface 211 is greater than or equal to the preset angle, and the light is totally reflected by the first incident surface 211. When the light is transmitted to the first exit surface 212 from the first incident surface 211, the incident angle of the light on the first exit surface 212 is less than the preset angle, and the light is transmitted by the first exit surface 212.

[0151] Therefore, as shown in FIG. 7, the light is totally reflected at least twice in the first light folding member 210, the light is folded at least twice, the path of the light can be increased, and the size of the optical lens 100 can be reduced.

[0152] In the embodiments of the present application, the first light folding member 210 includes a free-form surface. For example, at least one of the surfaces of the first light folding member 210 is a free-form surface. That is, at least one of the first incident surface 211, the first exit surface 212 and the first reflecting surface 213 is a free-form surface.

[0153] In this way, the free-form surface can well balance the chromatic aberration and the field curvature of the optical lens 100.

[0154] For example, the first incident surface 211 is a free-form surface. Alternatively, the first exit surface 212 is a free-form surface. Alternatively, the first reflecting surface 213 is a free-form surface.

[0155] Alternatively, for example, the first incident surface 211 and the first exit surface 212 are free-form surfaces. Alternatively, the first incident surface 211 and the first reflecting surface 213 are free-form surfaces. Alternatively, the first exit surface 212 and the first reflecting surface 213 are free-form surfaces.

[0156] Alternatively, for example, all the surfaces of the first light folding member 210 are free-form surfaces. That is, the first incident surface 211, the first exit surface 212 and the first reflecting surface 213 are free-form surfaces.

[0157] In this way, the chromatic aberration and the field curvature of the optical lens 100 can be further balanced.

[0158] In some embodiments, at least one of the surfaces of the first light folding member 210 is an off-axis non-rotationally symmetric free-form surface. That is, at least one of the first incident surface 211, the first exit surface 212 and the first reflecting surface 213 is an off-axis non-rotationally symmetric free-form surface.

[0159] Herein, the off-axis non-rotationally symmetric free-form surface refers to a free-form surface that cannot be obtained by rotation and whose central axis is not coincident with the optical axis.

[0160] For example, the first incident surface 211 is an off-axis non-rotationally symmetric free-form surface. Alternatively, the first exit surface 212 is an off-axis non-rotationally symmetric free-form surface. Alternatively, the first reflecting surface 213 is an off-axis non-rotationally symmetric free-form surface.

[0161] Alternatively, for example, the first incident surface 211 and the first exit surface 212 are off-axis non-rotationally symmetric free-form surfaces. Alternatively, the first incident surface 211 and the first reflecting surface 213 are off-axis non-rotationally symmetric free-form surfaces. Alternatively, the first exit surface 212 and the first reflecting surface 213 are off-axis non-rotationally symmetric free-form surfaces.

[0162] Alternatively, for example, all the surfaces of the first light splitting member 210 are off-axis non-rotationally symmetric free-form surfaces. That is, the first incident surface 211, the first exit surface 212, and the first reflecting surface 213 are off-axis non-rotationally symmetric free-form surfaces.

[0163] In this way, the aberration can be further corrected, and the design freedom can be improved.

[0164] The embodiments of the present application do not limit this, and reasonable settings can be made according to actual conditions.

[0165] Regarding the second light splitting member 220, with reference to FIG. 6, the second light splitting member 220 includes a second incident surface 221 and a second exit surface 222.

[0166] For example, the second light splitting member 220 can include a prism. For example, the prism can include any one of a three-prism, a four-prism, or a five-prism. That is, the second incident surface 221 and the second exit surface 222 can serve as any intersecting side surface of the prism.

[0167] Alternatively, for example, the second light splitting member 220 can be a combination of the second incident surface 221 and the second exit surface 222.

[0168] As shown in FIG. 6, the second incident surface 221 is arranged towards the first light splitting member 210, and the second exit surface 222 is arranged towards the third light splitting member 230.

[0169] For example, the second incident surface 221 is configured to transmit light from the first light splitting member 210 to the second exit surface 222, and the second exit surface 222 is configured to transmit at least part of the light from the second incident surface 221 to the third light splitting member 230.

[0170] That is, as shown in FIG. 7, the light rays emitted from the first light-turning piece 210 are incident to the second incident surface 221 of the second light-turning piece 220, and the light rays are transmitted to the second exit surface 222 after being transmitted through the second incident surface 221. Then the light rays are transmitted through the second exit surface 222.

[0171] Therefore, as shown in FIG. 7, the light rays emitted from the first light-turning piece 210 are transmitted through the second light-turning piece 220 and then transmitted to the third light-turning piece 230.

[0172] Here, it is illustrated that the second light-turning piece 220 can also include a reflecting surface, so that the light rays are emitted after being folded multiple times in the second light-turning piece 220. The embodiments of the present application do not limit this, and reasonable settings can be made according to actual conditions.

[0173] In the embodiments of the present application, the second light-turning piece 220 includes a free-form surface. For example, at least one of the surfaces of the second light-turning piece 220 is a free-form surface. That is, the second incident surface 221 or the second exit surface 222 is a free-form surface.

[0174] In this way, the free-form surface can balance the chromatic aberration and the field curvature of the optical lens 100.

[0175] For example, the second incident surface 221 is a free-form surface. Alternatively, the second exit surface 222 is a free-form surface.

[0176] Alternatively, for example, all the surfaces of the second light-turning piece 220 are free-form surfaces. That is, the second incident surface 221 and the second exit surface 222 are free-form surfaces.

[0177] In this way, the chromatic aberration and the field curvature of the optical lens 100 can be further balanced.

[0178] In some embodiments, at least one of the surfaces of the second light-turning piece 220 is an off-axis non-rotationally symmetric free-form surface. That is, the second incident surface 221 or the second exit surface 222 is an off-axis non-rotationally symmetric free-form surface.

[0179] In this way, the aberration can be corrected, and the design freedom can be improved.

[0180] For example, the second incident surface 221 is an off-axis non-rotationally symmetric free-form surface. Alternatively, the second exit surface 222 is an off-axis non-rotationally symmetric free-form surface.

[0181] Alternatively, for example, all the surfaces of the second light-turning piece 220 are off-axis non-rotationally symmetric free-form surfaces. That is, the second incident surface 221 and the second exit surface 222 are off-axis non-rotationally symmetric free-form surfaces.

[0182] In this way, the aberration can be further corrected, and the design freedom can be improved.

[0183] The embodiments of the present application do not limit this, and reasonable settings can be made according to actual conditions.

[0184] Regarding the third light folding piece 230, with continuous reference to FIG. 6, the third light folding piece 230 includes a third incident surface 231, a third exit surface 232, and a third reflection surface 233. The third incident surface 231, the third exit surface 232, and the third reflection surface 233 all intersect.

[0185] Illustratively, the third light folding piece 230 can include a prism. For example, the prism can include any one of a three-prism, a four-prism, or a five-prism, etc. That is, the third incident surface 231, the third exit surface 232, and the third reflection surface 233 can serve as any three intersecting sides of a prism.

[0186] Alternatively, illustratively, the third light folding piece 230 can be a combination of the third incident surface 231, the third exit surface 232, and the third reflection surface 233.

[0187] Illustratively, the third incident surface 231 is configured to transmit light from the second light folding piece 220 to the third exit surface 232, the third exit surface 232 is configured to reflect at least part of the light from the third incident surface 231 to the third reflection surface 233, the third reflection surface 233 is configured to reflect at least part of the light from the third exit surface 232 to the third exit surface 232, and the third exit surface 232 is further configured to transmit at least part of the light from the third incident surface 231.

[0188] That is, as shown in FIG. 7, the light emitted from the second light folding piece 220 is incident to the third incident surface 231 of the third light folding piece 230, and the light is transmitted to the third exit surface 232 of the third light folding piece 230 after being transmitted through the third incident surface 231. Then, the light is transmitted to the third reflection surface 233 of the third light folding piece 230 after being reflected by the third exit surface 232. Then, the light is transmitted to the third exit surface 232 after being reflected by the third reflection surface 233. Finally, the light is transmitted through the third exit surface 232.

[0189] That is, as shown in FIG. 7, the light emitted from the second light folding piece 220 is incident to the third incident surface 231 of the third light folding piece 230, and the light is transmitted to the third exit surface 232 of the third light folding piece 230 after being transmitted through the third incident surface 231. Then, the light is transmitted to the third reflection surface 233 of the third light folding piece 230 after being reflected by the third exit surface 232. Then, the light is transmitted to the third exit surface 232 after being reflected by the third reflection surface 233. Finally, the light is transmitted through the third exit surface 232.

[0190] It is illustrated that the third exit surface 232 and the third reflection surface 233 are both reflection surfaces, and the reflection surfaces are reflection surfaces that can be penetrated by light rays at a preset angle. For example, when the incident angle of the light rays is greater than or equal to the preset angle, the light rays can be totally reflected, that is, the light rays are reflected by the reflection surfaces. When the incident angle of the light rays is less than the preset angle, the light rays are transmitted from the reflection surfaces.

[0191] The light rays are transmitted to the third exit surface 232 from the third incident surface 231, the incident angle of the light rays at the third exit surface 232 is greater than or equal to the preset angle, and the light rays are totally reflected by the third exit surface 232. The light rays are reflected by the third reflection surface 233 from the third exit surface 232, the incident angle of the light rays at the third reflection surface 233 is greater than or equal to the preset angle, and the light rays are totally reflected by the third reflection surface 233. When the light rays are transmitted to the third exit surface 232 from the third reflection surface 233, the incident angle of the light rays at the third exit surface 232 is less than the preset angle, and the light rays are transmitted from the third exit surface 232.

[0192] Therefore, as shown in FIG. 7, the light rays are totally reflected at least twice in the third light folding member 230, the light rays are folded at least twice, the path of the light rays can be increased, and the size of the optical lens 100 can be reduced.

[0193] For example, as shown in FIG. 7, the image side of the optical lens 100 is further provided with a photosensitive element 20.

[0194] The photosensitive element 20 can include a detector or a sensor, for example.

[0195] As shown in FIG. 7, the photosensitive element 20 is arranged on the light exit side of the third light folding member 230. That is, the photosensitive element 20 is arranged on the outside of the third exit surface 232 of the third light folding member 230. The light rays emitted from the third light folding member 230 converge on the photosensitive element 20.

[0196] In the embodiment, the third light folding member 230 includes a free-form surface. For example, at least one of the surfaces of the third light folding member 230 is a free-form surface. That is, at least one of the third incident surface 231, the third exit surface 232 and the third reflection surface 233 is a free-form surface.

[0197] In this way, the chromatic aberration and the field curvature of the optical lens 100 can be balanced.

[0198] For example, the third incident surface 231 is a free-form surface. Alternatively, the third exit surface 232 is a free-form surface. Alternatively, the third reflection surface 233 is a free-form surface.

[0199] Alternatively, the third incident surface 231 and the third exit surface 232 are free curved surfaces.

[0200] Alternatively, the third incident surface 231 and the third exit surface 232 are free curved surfaces.

[0201] In this way, chromatic aberration and field curvature of the optical lens 100 can be further balanced.

[0202] In some embodiments, at least one of the surfaces of the third optical element 230 is an off-axis non-rotationally symmetric free curved surface. That is, at least one of the third incident surface 231, the third exit surface 232, and the third reflective surface 233 is an off-axis non-rotationally symmetric free curved surface.

[0203] In this way, aberration can be corrected, and the design freedom can be improved.

[0204] Alternatively, the third incident surface 231 and the third exit surface 232 are off-axis non-rotationally symmetric free curved surfaces. Alternatively, the third incident surface 231 and the third reflective surface 233 are off-axis non-rotationally symmetric free curved surfaces. Alternatively, the third exit surface 232 and the third reflective surface 233 are off-axis non-rotationally symmetric free curved surfaces.

[0205] Alternatively, the third incident surface 231 and the third exit surface 232 are off-axis non-rotationally symmetric free curved surfaces. Alternatively, the third incident surface 231 and the third reflective surface 233 are off-axis non-rotationally symmetric free curved surfaces. Alternatively, the third exit surface 232 and the third reflective surface 233 are off-axis non-rotationally symmetric free curved surfaces.

[0206] Alternatively, all the surfaces of the third optical element 230 are off-axis non-rotationally symmetric free curved surfaces. That is, the third incident surface 231, the third exit surface 232, and the third reflective surface 233 are off-axis non-rotationally symmetric free curved surfaces.

[0207] In this way, aberration can be further corrected, and the design freedom can be improved.

[0208] The present application does not limit this, and it can be reasonably set according to actual conditions.

[0209] In the present application, the lens 110 has optical power and can provide optical power for the optical path. At least part of the surfaces of the first optical element 210, the second optical element 220, and the third optical element 230 have optical power, which can provide optical power for the optical path, and the long-focus optical lens 100 is realized by the cooperation of the lens 110, the first optical element 210, the second optical element 220, and the third optical element 230.

[0210] In some embodiments, the refractive index n0 of the light rays in the lens 110, the refractive index n1 of the light rays in the first light folding member 210, the refractive index n2 of the light rays in the second light folding member 220, and the refractive index n3 of the light rays in the third light folding member 230 satisfy: n1 < n2 < n0 < n3.

[0211] In this way, chromatic aberration and field curvature can be balanced, the aperture of the optical lens 100 can be increased, and the size of the optical lens 100 can be reduced.

[0212] For example, the first light folding member 210, the second light folding member 220, and the third light folding member 230 are arranged at intervals.

[0213] That is, there is a gap between the first light folding member 210 and the second light folding member 220, and between the second light folding member 220 and the third light folding member 230.

[0214] Alternatively, for example, the first light folding member 210, the second light folding member 220, and the third light folding member 230 are arranged in abutment.

[0215] That is, the first exit surface 212 and the second entrance surface 221 are in abutment, and the second exit surface 222 and the third entrance surface 231 are in abutment. For example, an adhesive can be used for bonding.

[0216] For the convenience of understanding the optical lens 100 provided by the embodiments of the present application, simulation is performed, and the simulation results are described below.

[0217] Table 1 below shows the optical parameters of the optical lens 100 provided by the embodiments of the present application.

[0218] In Table 1, FOV is the field of view of the optical lens 100, F# is the aperture value of the optical lens 100, CRA is the chief ray angle of the optical lens 100, MTF is the modulation transfer function of the optical lens 100, the frequency of MTF is 125 lps / mm, and PIH is the half image height of the optical lens 100.

[0219] Table 1

[0220] FIG. 8A shows the modulation transfer function (MTF) curve of the optical lens 100 using the structure of the optical lens 100 shown in FIG. 6. The horizontal axis of FIG. 8A is spatial frequency, with units of line pairs per millimeter (lps / mm), and the vertical axis is the modulation transfer function. Each line in the figure represents the relationship between the modulation transfer function and the spatial frequency at different field angles.

[0221] As can be seen from the MTF curve of the optical lens 100 shown in FIG. 8A, the MTF coefficient is greater than 0.6, the imaging of the optical lens 100 is clear, and a better imaging effect can be achieved.

[0222] FIG. 8B shows a distortion grid diagram of the optical lens 100 shown in FIG. 6. The horizontal coordinate of FIG. 8B is the horizontal FOV, and the unit is millimeter (mm). The vertical coordinate is the vertical FOV, and the unit is millimeter (mm).

[0223] As can be seen from Table 1 and FIG. 8B, the distortion is less than 1%. The distortion of the optical lens 100 provided in the embodiments of the present application is well corrected, the imaging distortion is small, and the requirement of low distortion is met.

[0224] The optical lens 100 provided in the embodiments of the present application cooperates with three optical elements, the aperture can reach F2.1, the distortion can be effectively corrected, better optical performance can be achieved, and the requirements of large aperture, high reliability and small size are met. For example, the optical lens 100 provided in the embodiments of the present application can reduce the size by more than 4 mm, reduce the height by more than 3 mm, and increase the imaging size by about one time, for example, the imaging size is more than 10 mm.

[0225] The optical lens 100 provided in the embodiments of the present application includes, arranged in order from the object side to the image side, a lens 110 with positive refractive power, a first optical element 210 with a free-form surface, a second optical element 220 with a free-form surface, and a third optical element 230 with a free-form surface. After the light is output from the lens 110, the light is incident on the first optical element 210. The light is incident on the second optical element 220 after multiple reflections in the first optical element 210. After transmission through the second optical element 220, the light is transmitted to the third optical element 230, and is output after multiple reflections in the third optical element 230. The light is reflected multiple times when transmitted in the first optical element 210 and the third optical element 230, which can fold the optical path, reduce the size of the optical lens 100, and realize miniaturization of the optical lens 100. The optical lens 100 provided in the embodiments of the present application includes multiple free-form surfaces. The transmission of the light through the multiple free-form surfaces can increase the degree of freedom of aberration correction, and thus a larger light flux can be achieved while ensuring the imaging quality, and the imaging size of the optical lens 100 can be increased.

[0226] The embodiments of the present application also provide an optical lens, as shown in FIG. 9, which includes, arranged in order from the object side to the image side, a lens 110, a first optical element 210, and a third optical element 230.

[0227] The lens 110 has positive focal power, can converge light rays, and transmit the converged light rays to the first light folding member 210. The first light folding member 210 is configured to reflect the light rays from the lens 110 multiple times and transmit the reflected light rays to the third light folding member 230. The third light folding member 230 is configured to reflect the light rays from the second light folding member 220 multiple times and transmit the reflected light rays.

[0228] That is, as shown in FIG. 10, the light rays are incident on the lens 110, converged by the lens 110, and transmitted to the first light folding member 210. The light rays are then reflected multiple times in the first light folding member 210 and transmitted to the third light folding member 230. Finally, the light rays are reflected multiple times in the third light folding member 230 and transmitted.

[0229] The light rays are reflected multiple times when transmitted in the first light folding member 210 and the third light folding member 230, which can fold the optical path. Meanwhile, the first light folding member 210 and the third light folding member 230 are attached, which can reduce the size of the optical lens 100 and realize miniaturization of the optical lens 100. For example, the size of the optical lens 100 can be reduced by more than 7%.

[0230] The lens 110, the first light folding member 210, and the third light folding member 230 are the same as described above, and the related descriptions of the lens 110, the first light folding member 210, and the third light folding member 230 can be referred to.

[0231] The first light folding member 210 includes a free-form surface, and the third light folding member 230 includes a free-form surface.

[0232] For example, the first light folding member 210 includes a first incident surface 211, a first exit surface 212, and a first reflection surface 213.

[0233] As shown in FIG. 10, the first incident surface 211 is configured to transmit the light rays from the lens 110 to the first reflection surface 213, the first reflection surface 213 is configured to reflect at least part of the light rays from the first incident surface 211 to the first incident surface 211, the first incident surface 211 is further configured to reflect at least part of the light rays from the first reflection surface 213 to the first exit surface 212, and the first exit surface 212 is configured to transmit at least part of the light rays from the first incident surface 211 to the second light folding member 220.

[0234] For example, the third light folding member 230 includes a third incident surface 231, a third exit surface 232, and a third reflection surface 233.

[0235] As shown in FIG. 10, the third incident surface 231 is configured to transmit the light from the second light folding member 220 to the third exit surface 232, the third exit surface 232 is configured to reflect at least part of the light from the third incident surface 231 to the third reflection surface 233, the third reflection surface 233 is configured to reflect at least part of the light from the third exit surface 232 to the third exit surface 232, and the third exit surface 232 is further configured to transmit at least part of the light from the third incident surface 231.

[0236] In the embodiments of the present application, the first light folding member 210 and the third light folding member 230 are attached.

[0237] For example, the first exit surface 212 and the third incident surface 231 are attached by using an adhesive.

[0238] Here, it is explained that the shape of the first exit surface 212 is opposite to the shape of the third incident surface 231, that is, the first exit surface 212 and the third incident surface 231 are complementary. For example, the first exit surface 212 is a convex surface, and the third incident surface 231 is a concave surface. Alternatively, the first exit surface 212 is a concave surface, and the third incident surface 231 is a convex surface. In the embodiments of the present application, the shape of the first exit surface 212 and the shape of the third incident surface 231 are not limited, as long as the first exit surface 212 and the third incident surface 231 can be attached.

[0239] In the embodiments of the present application, the lens 110 has optical power, and can provide optical power for the optical path. At least part of the surfaces of the first light folding member 210 and the third light folding member 230 have optical power, and can provide optical power for the optical path. The long-focus optical lens 100 is realized by the cooperation of the lens 110, the first light folding member 210 and the third light folding member 230.

[0240] In some embodiments, the refractive index n0 of the light in the lens 110, the refractive index n1 of the light in the first light folding member 210, and the refractive index n3 of the light in the third light folding member 230 satisfy: n1 < n0 < n3.

[0241] In this way, the chromatic aberration and the field curvature can be balanced, the aperture of the optical lens 100 can be increased, and the size of the optical lens 100 can be reduced.

[0242] For the convenience of understanding the optical lens 100 provided in the embodiments of the present application, the optical lens 100 is simulated, and the simulation effect is described below.

[0243] Table 2 below shows the optical parameters of the optical lens 100 provided in the embodiments of the present application.

[0244] Wherein, FOV is the field of view of the optical lens 100; F# is the aperture value of the optical lens 100; CRA is the chief ray angle of the optical lens 100; MTF is the modulation transfer function of the optical lens 100; the frequency of MTF is 90 lps / mm; and PIH is the half image height of the optical lens 100.

[0245] Table 2

[0246] Fig. 11A is a curve diagram of the modulation transfer function (MTF) of the optical lens 100 with the structure shown in Fig. 9. The horizontal coordinate of Fig. 11A is spatial frequency, and the unit is line per millimeter (lps / mm), and the vertical coordinate is modulation transfer function. Each line in the figure represents the relationship between the modulation transfer function and the spatial frequency under different field angles.

[0247] As can be seen from the MTF curve of the optical lens 100 shown in Fig. 11A, the MTF coefficient is above 0.5, the imaging of the optical lens 100 is clear, and better imaging effect can be achieved.

[0248] Fig. 11B is a distortion grid diagram of the optical lens 100 with the structure shown in Fig. 9. The horizontal coordinate of Fig. 11B is horizontal FOV, and the unit is millimeter (mm), and the vertical coordinate is vertical FOV, and the unit is millimeter (mm).

[0249] As can be seen from Table 2 and Fig. 11B, the distortion is about equal to 0. The distortion of the optical lens 100 provided by the embodiment of the present application is effectively corrected, the imaging distortion is small, and the requirement of low distortion is met.

[0250] The optical lens 100 provided by the embodiment of the present application adopts two mutually adhered light folding members, the aperture can reach F2.22, the distortion can be effectively corrected, better optical performance can be achieved, and the requirements of large aperture, high reliability and small size are met.

[0251] The optical lens 100 provided in the embodiments of the present application comprises, in sequence from the object side to the image side, a lens 110 with positive refractive power, a first light folding member 210 with a free-form surface, and a third light folding member 230 with a free-form surface. After being output from the lens 110, the light rays enter the first light folding member 210, are reflected multiple times in the first light folding member 210, enter the third light folding member 230, and are output after being reflected multiple times in the third light folding member 230. The light rays are reflected multiple times when transmitting in the first light folding member 210 and the third light folding member 230, which can fold the optical path, reduce the size of the optical lens 100, and realize miniaturization of the optical lens 100. In addition, the first light folding member 210 and the third light folding member 230 can be attached to further reduce the size of the optical lens 100 and reduce the assembly difficulty. The optical lens 100 provided in the embodiments of the present application comprises multiple free-form surfaces, and the light rays transmit through the multiple free-form surfaces, which can increase the aberration correction degree of freedom, and thus can realize a larger light flux and increase the imaging size of the optical lens 100 while ensuring the imaging quality.

[0252] The embodiments of the present application also provide a packaging structure of an optical lens, which can be used for packaging the optical lens 100. As shown in FIGS. 12A and 12B, the packaging structure 200 of the optical lens comprises a lens barrel 310 provided with a receiving cavity 311 and a guide rail 320 arranged inside the lens barrel 310. The side wall of the lens barrel 310 is provided with a limiting hole 312, the limiting hole 312 penetrates through the side wall of the lens barrel 310 and communicates with the receiving cavity 311.

[0253] For example, the receiving cavity 311 is used for placing the light folding member (one or more of the first light folding member 210, the second light folding member 220, and the third light folding member 230) of the optical lens 100.

[0254] The guide rail 320 is used for connecting the light folding member, so that the light folding member can move along the extension direction of the lens barrel 310.

[0255] The light folding member is connected with the lens barrel 310 through the guide rail 320, and can be fixed inside the lens barrel 310 through the guide rail 320.

[0256] For example, the limiting hole 312 is used for placing the lens 110 of the optical lens 100.

[0257] The limiting hole 312 is the light entering side (object side) of the optical lens 100.

[0258] The shape of the limiting hole 312 can be the same as that of the lens 110. The shape of the limiting hole 312 is not limited in the embodiments of the present application, and can be reasonably set according to the actual situation.

[0259] In some embodiments, the packaging structure 200 further comprises a light barrier 330.

[0260] As shown in FIG. 12A, the light barrier 330 is arranged outside the lens barrel 310.

[0261] The material of the light barrier 330 may, for example, comprise a light-shielding material to avoid interference with the incidence of light into the optical lens 100.

[0262] In some embodiments, the sidewall of the lens barrel 310 is further provided with a light exit hole 313, and the packaging structure 200 further comprises a filter 340.

[0263] As shown in FIG. 12A, the filter 340 is arranged in the light exit hole 313.

[0264] The filter 340 is used to filter out unnecessary wave bands in light, to prevent the photosensitive element 20 from generating false colors or moire, so as to improve the effective resolution and color restoration.

[0265] The embodiments of the present application further provide a packaging method of an optical lens, as shown in FIG. 13, the packaging method comprises:

[0266] S1, mounting the lens 110 into the limiting hole 312.

[0267] That is, the light entrance side of the optical lens 100, i.e., the object side, is determined.

[0268] S2, fixing the light folding member on the guide rail 320.

[0269] In some embodiments, the light folding member of the optical lens 100 comprises the first light folding member 210, the second light folding member 220 and the third light folding member 230.

[0270] For example, the first light folding member 210 and the third light folding member 230 can be first fixed on the guide rail 320 with a gap between them, and then the position of the second light folding member 220 is adjusted by active coupling according to the imaging quality, so as to make the imaging quality better, and finally the second light folding member 220 is fixed on the guide rail 320.

[0271] In other embodiments, the light folding member of the optical lens 100 comprises the first light folding member 210 and the third light folding member 230.

[0272] For example, the first exit surface 212 of the first light folding member 210 and the third entrance surface 231 of the third light folding member 230 can be first adhered, and then the first light folding member 210 and the third light folding member 230 are fixed on the guide rail 320.

[0273] It is illustrated that the light folding piece is placed in the lens barrel 310 through the guide rail 320 after being fixed.

[0274] S3, the light blocking piece 330 is arranged outside the lens barrel 310.

[0275] S4, the light filter 340 is arranged at the light outlet hole 313 of the lens barrel 310.

[0276] S5, the photosensitive element 20 is arranged at the side of the light filter 340 away from the light folding piece.

[0277] The packaging structure 200 of the optical lens provided by the embodiment of the application has simple structure, the light folding piece is fixed on the lens barrel 310 through the guide rail 320, is convenient to assemble, and has strong applicability.

[0278] The above is only a specific embodiment of the application, but the protection scope of the application is not limited to this, any change or replacement within the technical range disclosed by the application should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. An optical lens characterized in that, Comprising: a lens, a first light folding member, a second light folding member and a third light folding member arranged in sequence from an object side to an image side; the lens has positive refractive power; the first light folding member comprises a free-form surface; the first light folding member is configured to reflect light rays from the lens multiple times and transmit the reflected light rays to the second light folding member; the second light folding member comprises a free-form surface; the second light folding member is configured to transmit light rays from the first light folding member to the third light folding member; the third light folding member comprises a free-form surface; the third light folding member is configured to reflect light rays from the second light folding member multiple times and transmit the reflected light rays; wherein the light rays emitted from the lens are transmitted after sequentially passing through the free-form surface of the first light folding member, the free-form surface of the second light folding member and the free-form surface of the third light folding member.

2. The optical lens of claim 1, wherein, the first light folding member comprises a first incident surface, a first exit surface and a first reflection surface; the first incident surface is arranged towards the lens, and the first exit surface is arranged towards the second light folding member; the first incident surface, the first exit surface and the first reflection surface all intersect; at least one of the first incident surface, the first exit surface and the first reflection surface is a free-form surface; the first incident surface is configured to transmit light rays from the lens to the first reflection surface; the first reflection surface is configured to reflect at least part of the light rays from the first incident surface to the first incident surface; the first incident surface is further configured to reflect at least part of the light rays from the first reflection surface to the first exit surface; the first exit surface is configured to transmit at least part of the light rays from the first incident surface to the second light folding member.

3. The optical lens according to claim 1 or 2, characterized in that, the second light folding member comprises a second incident surface and a second exit surface; the second incident surface is arranged towards the first light folding member, and the second exit surface is arranged towards the third light folding member; the second incident surface or the second exit surface is a free-form surface; the second incident surface is configured to transmit light rays from the first light folding member to the second exit surface; the second exit surface is configured to transmit at least part of the light rays from the second incident surface to the third light folding member.

4. The optical lens according to any one of claims 1 to 3, characterized in that, the third light folding member comprises a third incident surface, a third exit surface and a third reflection surface; the third incident surface is arranged towards the second light folding member; the third incident surface, the third exit surface and the third reflection surface all intersect; at least one of the third incident surface, the third exit surface and the third reflection surface is a free-form surface; the third incident surface is configured to transmit light rays from the second light folding member to the third exit surface; the third exit surface is configured to reflect at least part of the light rays from the third incident surface to the third reflection surface; the third reflection surface is configured to reflect at least part of the light rays from the third exit surface to the third exit surface; the third exit surface is further configured to transmit at least part of the light rays from the third reflection surface.

5. The optical lens according to any one of claims 1-4, wherein: all surfaces of the first light folding member are free-form surfaces; and / or, ​ All surfaces of the second light folding member are free curved surfaces; and / or, All surfaces of the third light folding member are free curved surfaces.

6. The optical lens according to any one of claims 1-5, wherein, At least one of the surfaces of the first light folding member is an off-axis non-rotationally symmetric free curved surface; and / or, At least one of the surfaces of the second light folding member is an off-axis non-rotationally symmetric free curved surface; and / or, At least one of the surfaces of the third light folding member is an off-axis non-rotationally symmetric free curved surface.

7. The optical lens according to any one of claims 1 to 6, characterized in that, The refractive index n0 of the light ray in the lens, the refractive index n1 of the light ray in the first light folding member, the refractive index n2 of the light ray in the second light folding member, and the refractive index n3 of the light ray in the third light folding member satisfy: n1 < n2 < n0 < n3.

8. The optical lens of any of claims 1-7, wherein, The object side surface and the image side surface of the lens are aspheric surfaces.

9. The optical lens of any of claims 1-8, wherein, The object side surface and the image side surface of the lens are rotationally symmetric surfaces.

10. The optical lens according to any one of claims 1 to 9, characterized in that, The object side surface of the lens is a convex surface.

11. The optical lens of any of claims 1-10, wherein, The first light folding member comprises a first incident surface, a first exit surface, and a first reflection surface; the first incident surface is arranged towards the lens, and the first exit surface is arranged towards the second light folding member; the second light folding member comprises a second incident surface and a second exit surface; the second incident surface is arranged towards the first light folding member, and the second exit surface is arranged towards the third light folding member; the third light folding member comprises a third incident surface, a third exit surface, and a third reflection surface; the third incident surface is arranged towards the second light folding member; the first exit surface and the second incident surface are attached, and the second exit surface and the third incident surface are attached.

12. The optical lens according to any one of claims 1-11, wherein, The first light folding member comprises a prism; and / or, The second light folding member comprises a prism; and / or, The third light folding member comprises a prism.

13. An optical lens, characterized in that, Comprise: The lens, the first light folding member, and the third light folding member are arranged in sequence from the object side to the image side; The lens has a positive focal power; The first light folding member comprises a free curved surface; the first light folding member is used for reflecting the light ray from the lens multiple times and transmitting the reflected light ray to the second light folding member; The third light folding member comprises a free curved surface; the third light folding member is used for reflecting the light ray from the first light folding member multiple times and transmitting the reflected light ray; The first light folding member and the third light folding member are attached; the light ray emitted from the lens is transmitted after sequentially passing through the free curved surface of the first light folding member and the free curved surface of the third light folding member.

14. The optical lens according to claim 13, wherein, The first light folding member comprises a first incident surface, a first exit surface, and a first reflection surface; the first incident surface is arranged towards the lens, and the first exit surface is arranged towards the second light folding member; the first incident surface, the first exit surface, and the first reflection surface all intersect; at least one of the first incident surface, the first exit surface, and the first reflection surface is a free curved surface; The first incident surface is used for transmitting the light ray from the lens to the first reflection surface; The first reflection surface is configured to reflect at least part of the light from the first incidence surface to the first incidence surface; The first incidence surface is further configured to reflect at least part of the light from the first reflection surface to the first exit surface; The first exit surface is configured to transmit at least part of the light from the first incidence surface to the second optical element; The third optical element comprises a third incidence surface, a third exit surface and a third reflection surface; the third incidence surface is arranged towards the second optical element; the third incidence surface, the third exit surface and the third reflection surface all intersect; at least one of the third incidence surface, the third exit surface and the third reflection surface is a free-form surface; The third incidence surface is configured to transmit the light from the second optical element to the third exit surface; The third exit surface is configured to reflect at least part of the light from the third incidence surface to the third reflection surface; The third reflection surface is configured to reflect at least part of the light from the third exit surface to the third exit surface; The third exit surface is further configured to transmit at least part of the light from the third reflection surface; The first exit surface and the third incidence surface are attached.

15. The optical lens according to claim 13 or 14, characterized in that, The refractive index n0 of the light in the lens, the refractive index n1 of the light in the first optical element and the refractive index n3 of the light in the third optical element satisfy: n1 < n0 < n3.

16. An image capture module, comprising: The package structure, the optical sensor and the optical lens as claimed in any one of claims 1-15; the optical sensor is arranged on the image side of the optical lens; the optical lens is arranged in the package structure; The package structure comprises a lens barrel and a guide rail; The lens barrel is provided with a receiving cavity; a limiting hole is formed in the sidewall of the lens barrel, the limiting hole penetrates through the sidewall of the lens barrel and is in communication with the receiving cavity; the receiving cavity is used for placing the optical element of the optical lens, and the limiting hole is used for placing the lens of the optical lens; The guide rail is arranged on the inner side of the lens barrel; the guide rail is used for connecting the optical element, so that the optical element can move along the extension direction of the lens barrel.

17. The camera module of claim 16, wherein, The package structure further comprises a light shielding sheet; the light shielding sheet is arranged on the outer side of the lens barrel.

18. The camera module of claim 16 or 17, wherein, The sidewall of the lens barrel is further provided with a light exit hole; the package structure further comprises a light filter; the light filter is arranged in the light exit hole.

19. An electronic device, comprising: The camera module as claimed in any one of claims 16-18 and a printed circuit board; the camera module and the printed circuit board are electrically connected.

20. A package structure, comprising: The camera module comprises: a lens barrel, the lens barrel is provided with a receiving cavity; a limiting hole is formed in the sidewall of the lens barrel, the limiting hole penetrates through the sidewall of the lens barrel and is in communication with the receiving cavity; the receiving cavity is used for placing the optical element of the optical lens, and the limiting hole is used for placing the lens of the optical lens; a guide rail, the guide rail is arranged on the inner side of the lens barrel; the guide rail is used for connecting the optical element, so that the optical element can move along the extension direction of the lens barrel.

Images