Camera module and electronic equipment

Abstract

The invention discloses a camera module and electronic equipment, the camera module is provided with an optical system, and the optical system comprises a lens group; the first reflecting part has focal power, the first reflecting part comprises a first light incident surface, a first reflecting surface and a first light emergent surface, the first light incident surface is a convex surface, and the first light emergent surface is opposite to the object side surface of the lens group; the focal length of the first reflecting part is f1, the focal length of the optical system is ef1, and the relationship between the focal length f1 of the first reflecting part and the focal length ef1 of the optical system meets the condition that f1 / ef1 is greater than or equal to 2 and less than or equal to 5; and the photosensitive chip is arranged corresponding to the image side of the lens group and is used for receiving the light penetrating through the lens group.

Description

Technical Field

[0001] This application belongs to the field of shooting technology, and particularly relates to an imaging module and an electronic device. Background Art

[0002] With the popularization of electronic devices, the camera function has become increasingly important and has become an important factor for consumers when choosing a device. The basic configuration of current electronic devices on the market is a telephoto lens group. In order to obtain a clearer and farther shooting effect, the current telephoto lens group is developing towards longer focal lengths and dual telephoto lens groups, resulting in a relatively large volume of the optical system, which is not conducive to the thinning and lightening of electronic devices. Summary of the Invention

[0003] This application aims to provide an imaging module and an electronic device to solve the problem that the relatively large volume of the optical system is not conducive to the thinning and lightening of electronic devices.

[0004] To solve the above technical problems, this application is implemented as follows:

[0005] In a first aspect, an embodiment of this application provides an imaging module having an optical system, and the optical system includes:

[0006] A lens group;

[0007] A first reflector having a focal power, the first reflector including a first incident surface, a first reflection surface, and a first exit surface, the first incident surface being a convex surface, the first exit surface being opposite to the object side of the lens group; the focal length of the first reflector is f1, the focal length of the optical system is efl, and the relationship between the focal length f1 of the first reflector and the focal length efl of the optical system satisfies: 2 ≤ f1 / efl ≤ 5;

[0008] An image sensor chip disposed corresponding to the image side of the lens group for receiving the light passing through the lens group.

[0009] In a second aspect, an embodiment of this application provides an electronic device, including:

[0010] A housing;

[0011] An imaging module, which is the above-mentioned imaging module and is assembled in the housing.

[0012] In an embodiment of the present application, the first light incident surface can transmit light to the first reflection surface, the first reflection surface can reflect the light to the first light exit surface, and the first light exit surface can transmit the light to the lens group, which can increase the optical path of the camera module. Moreover, the first light incident surface is a convex surface, so that the first reflection member has a focal power, which can shorten the focal length of the camera module. In this way, under the action of the first reflection member with a focal power, the length of the lens group and the overall length of the camera module can be reduced, and thus the volume of the camera module can be reduced, which is beneficial to realizing the thinning design of the electronic device.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0015] Figure 1 is a top view of a camera module according to an embodiment of the present invention;

[0016] Figure 2 is a top view of the corresponding camera module in Embodiment 1;

[0017] Figure 3 is a schematic diagram of axial chromatic aberration in Embodiment 1;

[0018] Figure 4 is a schematic diagram of defocus MTF in Embodiment 1;

[0019] Figure 5 is a top view of the corresponding camera module in Embodiment 2;

[0020] Figure 6 is a schematic diagram of axial chromatic aberration in Embodiment 2;

[0021] Figure 7 is a schematic diagram of defocus MTF in Embodiment 2;

[0022] Figure 8 is a top view of the corresponding camera module in Embodiment 3;

[0023] Figure 9 is a schematic diagram of axial chromatic aberration in Embodiment 3;

[0024] Figure 10 is a schematic diagram of defocus MTF in Embodiment 3;

[0025] Figure 11 is a top view of the corresponding camera module in Embodiment 4;

[0026] Figure 12 It is a schematic diagram of the axial chromatic aberration in Embodiment 4;

[0027] Figure 13 It is a schematic diagram of the defocus MTF in Embodiment 4;

[0028] Figure 14 It is a top view of the corresponding camera module in Embodiment 5.

[0029] Reference numerals:

[0030] 1, lens group; 11, first lens; 12, second lens; 13, third lens; 14, fourth lens; 15, fifth lens; 21, first group; 22, second group; 3, first reflector; 31, first light incident surface; 32, first reflecting surface; 33, first light exit surface; 4, photosensitive chip; 5, filter; 6, second reflector; 61, second light incident surface; 62, second reflecting surface; 63, second light exit surface. Detailed implementation manners

[0031] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

[0032] The terms "first" and "second" in the description and claims of this application may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects. The character " / " generally indicates an "or" relationship between the related objects before and after.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] The following will describe a camera module and an electronic device according to embodiments of the present invention in conjunction with Figure 1 - Figure 14 Describe a camera module and an electronic device according to embodiments of the present invention.

[0036] As Figure 1 shown, in a camera module according to some embodiments of the present invention, the camera module has an optical system, and the optical system includes: a lens group 1; a first reflector 3, the first reflector 3 having a focal power, the first reflector 3 including a first light incident surface 31, a first reflection surface 32, and a first light exit surface 33, the first light incident surface 31 being a convex surface, the first light exit surface 33 being opposite to the object side surface of the lens group 1; the focal length of the first reflector 3 being f1, the focal length of the optical system being efl, and the relationship between the focal length f1 of the first reflector 3 and the focal length efl of the optical system satisfying: 2 ≤ f1 / efl ≤ 5; an image sensor chip 4, the image sensor chip 4 being disposed corresponding to the image side of the lens group 1 for receiving light passing through the lens group 1.

[0037] In an embodiment of the present application, the first light incident surface 31 can transmit light to the first reflection surface 32, the first reflection surface 32 can reflect light to the first light exit surface 33, and the first light exit surface 33 can transmit light to the lens group 1, which can increase the optical path of the camera module. Moreover, since the first light incident surface 31 is a convex surface, the first reflector 3 has a focal power, which can shorten the focal length of the camera module. In this way, under the action of the first reflector 3 having a focal power, the length of the lens group 1 and the overall length of the camera module can be reduced, and further the volume of the camera module can be reduced, which is beneficial to realizing the thin and light design of the electronic device.

[0038] In an embodiment of the present application, the camera module can be applied to an electronic device with a photographing function such as a mobile phone, a computer, a notebook, or a camera. The lens group 1 in the camera module is used to collect light, and the lens group 1 has opposite object side and image side. Among them, the side where the object to be photographed of the lens group 1 is located is the object side, that is, the object side is the light incident side of the lens group 1, and light enters the lens group 1 from the object side surface of the lens group 1; the side where the image of the object to be photographed of the lens group 1 is located is the image side, that is, the image side is the light exit side of the lens group 1, and light exits the lens group 1 from the image side surface of the lens group 1.

[0039] Specifically, the lens group 1 has a field of view (FOV) and a half field of view. With the lens group 1 as the vertex, the included angle formed by the two edges of the maximum range through which the image of the object to be photographed can pass through the lens group 1 is the field of view. The size of the field of view determines the viewing range of the lens group 1. The larger the field of view, the larger the viewing range. The half field of view (HFOV) refers to half of the field of view.

[0040] Specifically, the lens group 1 also has an aperture. The aperture is a device used to control the amount of light passing through the lens group 1 and entering the internal part of the electronic device. Usually inside the lens group 1, the size of the aperture is expressed by the F# value. The aperture number F# is the relative value (the reciprocal of the relative aperture) obtained by dividing the focal length of the lens group 1 by the light passing diameter of the lens group 1. The smaller the value of the aperture number F#, the more light enters in the same unit time, the smaller the depth of field, and the background content of the photo will be blurred, producing an effect similar to that of a telephoto lens group.

[0041] Specifically, the photosensitive chip 4 in the imaging module can be correspondingly arranged on the image side of the lens group 1, so that the photosensitive chip 4 can receive the light passing through the lens group 1 and realize photoelectric conversion imaging. The photosensitive chip 4 has an imaging surface. As a light receiver, the object-side light rays are refracted by the lens group 1 and imaged on the photosensitive chip 4. The photosensitive chip 4 can include one of complementary metal oxide semiconductor (CMOS) and charge coupled device (CCD).

[0042] Optionally, the imaging module further includes a filter 5. The filter 5 can be arranged between the image side of the lens group 1 and the photosensitive chip 4 to filter the stray light passing through the lens group 1 and improve the imaging effect of the photosensitive chip 4. Or, the filter 5 can also be arranged on the object side of the lens group 1 to filter the stray light entering the lens group 1 and improve the imaging effect of the photosensitive chip 4.

[0043] Specifically, the filter 5 can play a role in filtering infrared rays, so that the photosensitive chip 4 can more accurately capture and reproduce the image colors in the visible light range. The substrate of the filter 5 can be flat glass, and the surface of the flat glass can be coated with an AR antireflection film and an IR cut-off film respectively to filter near-infrared light rays to realize the filter 5 filtering infrared rays.

[0044] Specifically, the imaging module further includes a first reflector 3. The first reflector 3 has a refractive power. Among them, the refractive power refers to the reciprocal of the focal length of the lens. The refractive power of the first reflector 3 characterizes the refracting ability of the first light incident surface 31 on the incident parallel light beam. The first reflector 3 includes a first light incident surface 31, a first reflecting surface 32 and a first light exiting surface 33, asFigure 1 As shown, since the first light-emitting surface 33 faces the object side of the lens group 1, in this way, light can enter the first reflector 3 from the first light-incident surface 31, and then after being reflected by the first reflecting surface 32, it exits from the first light-emitting surface 33 and is transmitted to the object surface side of the lens group 1. Under the reflection of the first reflector 3, the optical path of the imaging module can be increased.

[0045] Specifically, the first light-incident surface 31 is a convex surface, so that the object side of the first reflector 3 is a convex surface. The first reflector 3 can have a positive optical power, which can shorten the focal length of the imaging module. Under the action of the first reflector 3 with a positive focal length, the size of the lens group 1 and the overall length of the imaging module can be reduced, thereby reducing the volume of the imaging module.

[0046] Specifically, efl is a measure of the ability of the optical system of the imaging module to characterize the aggregation or divergence of light. It refers to the perpendicular distance from the optical center of the lens or lens group to the focal plane when an infinitely distant scene forms a clear image on the focal plane through the lens or lens group. From a practical perspective, it can be understood as the distance from the center of the lens group 1 to the imaging plane.

[0047] Specifically, the first light-incident surface 31 of the first reflector 3 is a convex surface. Considering the concept similar to "focal length" from an equivalent perspective, if the first reflector 3 is associated with an ideal imaging system, when a beam of parallel light is incident on the first light-incident surface 31 of the first reflector 3, the first light-incident surface 31 will cause the light to have a certain degree of convergence tendency. After that, the light is reflected by the first reflecting surface 32 and reflected or refracted by the first light-emitting surface 33 and other effects, so that the outgoing light approximately converges at a point (or the reverse extension line converges at a point). Then, the distance from the vertex of the first light-incident surface 31 to this approximate convergence point can be regarded as an equivalent focal length, and this equivalent focal length is the focal length f1 of the first reflector 3.

[0048] Specifically, controlling the relationship between the focal length f1 of the first reflector 3 and the focal length efl of the optical system to satisfy: 2 ≤ f1 / efl ≤ 5 is also convenient for ensuring the reliability of the focusing and zooming functions of the imaging module.

[0049] For example, f1 / efl can be 2, 2.8, 3, 3.5, 4 or 5, etc.

[0050] Optionally, the first reflecting surface 32 forms an acute angle with the optical axis of the lens group 1, and the orientation of the first light-emitting surface 33 is parallel to the optical axis of the lens group 1; wherein, the light enters from the first light-incident surface 31, is reflected by the first reflecting surface 32 and exits along a direction parallel to the optical axis of the lens group 1, which is convenient for ensuring the reliability of the light transmission along the optical path of the imaging module.

[0051] Specifically, the first reflector 3 can be a reflecting prism, such asFigure 1 As shown, light is incident on the first light incident surface 31 along the S1 direction, i.e., the vertical direction, and then after being reflected by the first reflecting surface 32, it exits from the first light exiting surface 33 along the S2 direction, i.e., the horizontal direction. The S1 direction and the S2 direction are arranged at an angle, and the S2 direction is consistent with the optical axis direction of the lens group 1.

[0052] Specifically, the first reflecting surface 32 can be a plane to facilitate controlling the light transmission path and ensuring the reflection effect of the first reflecting surface 32 on light.

[0053] In some embodiments, the first light exiting surface 33 can be a plane, and the first light exiting surface 33 can be perpendicular to the optical axis of the lens group 1. Or, the first light exiting surface 33 can be a concave surface, and the normal line of at least one point on the first light exiting surface 33 can be perpendicular to the optical axis of the lens group 1. The orientation of the first light exiting surface 33 is parallel to the optical axis of the lens group 1, which is convenient for ensuring that the light exiting from the first light exiting surface 33 can be directed towards the lens group 1 along the optical axis of the lens group 1. As Figure 1 and Figure 2 shown, the orientation of the first light exiting surface 33 is the horizontal direction and is parallel to the S2 direction.

[0054] In other embodiments, the first light exiting surface 33 can also be a convex surface, etc. In the embodiments of the present application, the shape of the first light exiting surface 33 is not specifically limited.

[0055] In some alternative embodiments, the focal length of the lens group 1 is f2, and the relationship between the focal length efl of the optical system and the focal length f2 of the lens group 1 satisfies: efl ≤ f2.

[0056] In the embodiments of the present application, by controlling the relationship between the focal length efl of the optical system and the focal length f2 of the lens group 1 to satisfy: efl ≤ f2, it is convenient to ensure the reliability of the imaging module to achieve the focusing and zooming functions.

[0057] Specifically, the focal length of the lens group 1 being f2 means that as a whole, the ability of the lens group to converge or diverge light is measured.

[0058] In some alternative embodiments, the lens group 1 includes a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14 arranged in sequence along its optical axis direction; the object side of the first lens 11 faces the first light exiting surface 33, and the image side of the fourth lens 14 is correspondingly arranged with the photosensitive chip 4; the first lens 11 has a positive optical power, and the object side of the first lens 11 is a convex surface; the second lens 12 has a negative optical power, and the image side of the second lens 12 is a concave surface; the third lens 13 has a positive optical power, and the object side of the third lens 13 is a convex surface; the fourth lens 14 has a negative optical power, and the image side of the fourth lens 14 is a concave surface.

[0059] In the embodiments of the present application, by adjusting the types of the lenses in the lens group 1, it is convenient to ensure the functional reliability of the camera module for focusing and zooming, and moreover, it is convenient to reduce the size of the lens group 1.

[0060] Specifically, the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 can be arranged in sequence along the optical axis direction of the lens group 1. The object side surface of the first lens 11 can face the first exit surface, and the image side surface of the fourth lens 14 is correspondingly arranged with the photosensitive chip 4. During the shooting process, after the light is reflected by the first reflector 3, it sequentially passes through the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and then is projected onto the photosensitive chip 4 for imaging.

[0061] Specifically, the object side surface of the first lens 11 is a convex surface, so that the first lens 11 is a convex lens, and the first lens 11 can have a positive optical power. The image side surface of the first lens 11 can be a plane or a concave surface, etc., and the embodiments of the present application do not make specific limitations on this.

[0062] Specifically, the image side surface of the second lens 12 is a concave surface, so that the second lens 12 is a concave lens, and the second lens 12 can have a negative optical power. The object side surface of the second lens 12 can be a plane or a convex surface, etc., and the embodiments of the present application do not make specific limitations on this.

[0063] Specifically, the object side surface of the third lens 13 is a convex surface, so that the third lens 13 is a convex lens, and the third lens 13 can have a positive optical power. The image side surface of the third lens 13 can be a plane or a concave surface, etc., and the embodiments of the present application do not make specific limitations on this.

[0064] Specifically, the image side surface of the fourth lens 14 is a concave surface, so that the fourth lens 14 is a concave lens, and the fourth lens 14 can have a negative optical power. The object side surface of the fourth lens 14 can be a plane or a convex surface, etc., and the embodiments of the present application do not make specific limitations on this.

[0065] Wherein, the surface of the lens facing the object side is the object side surface of the lens, that is, the object side surface of the lens is the light incident surface of the lens, and the light enters the lens from the object side surface of the lens; the surface of the lens facing the image side is the image side surface, that is, the image side surface of the lens is the light exit surface of the lens, and the light exits the lens from the image side surface of the lens. For example, as Figure 1 shown, the left side surface of the first lens 11 is the object side surface, and the right side surface is the image side surface.

[0066] In some embodiments, the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 can be combined to form the lens group 1. The lens group 1 can move along its optical axis direction to realize the focusing function of the camera module, so as to focus on objects at different distances.

[0067] In some other embodiments, the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 can be divided into two groups, and at least one of the two groups can move along the optical axis direction of the lens group 1 to achieve the focusing function of the imaging module.

[0068] Generally, the longer the focal length of the lens group 1, the more lens elements are required. Further, at least one fifth lens 15 is disposed between the third lens 13 and the fourth lens 14 so that the lens group 1 can include a greater number of lenses, enabling the imaging module to compensate for aberrations and other optical problems caused by changes in focal length when switching between different focal lengths.

[0069] Specifically, the number of the fifth lenses 15 can be one, two, three, four, etc., and the embodiments of the present application do not make specific limitations thereon.

[0070] Specifically, the object side surface of the fifth lens 15 can be a convex surface, so that the fifth lens 15 can be a convex lens and can have a positive optical power. In this case, the image side surface of the fifth lens 15 can be a flat surface or a concave surface. Alternatively, the image side surface of the fifth lens 15 can be a concave surface, so that the fifth lens 15 can be a concave lens and can have a negative optical power. In this case, the object side surface of the fifth lens 15 can be a flat surface or a convex surface, etc.

[0071] Further, when the number of the fifth lenses 15 is at least two, the types of the at least two fifth lenses 15 can be the same or different, and the embodiments of the present application do not make specific limitations thereon.

[0072] Specifically, the first lens 11, the second lens 12, and the third lens 13 can be three lenses sequentially disposed close to the first reflector 3, and the fourth lens 14 can be a single lens disposed close to the photosensitive chip 4. During shooting, after the light is reflected by the first reflector 3, it sequentially passes through the first lens 11, the second lens 12, the third lens 13, the fifth lens 15, and the fourth lens 14, and then is incident on the photosensitive chip 4.

[0073] In some alternative embodiments, a part of the lenses among the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 form a first group 21, and another part of the lenses form a second group 22; both the first group 21 and the second group 22 are disposed between the first reflector 3 and the photosensitive chip 4, and the first group 21 is disposed between the first reflector 3 and the second group 22; at least one of the first group 21 and the second group 22 can move along the optical axis direction of the lens group 1.

[0074] In the embodiments of the present application, the lens group 1 is composed of a first group 21 and a second group 22. At least one of the first group 21 and the second group 22 can move along the optical axis direction of the lens group 1, and the focusing and zooming functions of the imaging module can be realized.

[0075] In some embodiments, the second group 22 can be a fixed group, the first group 21 can be a movable group, the first group 21 is a focusing group, and the first group 21 can move along the optical axis direction of the lens group 1 to achieve focusing on objects at different distances.

[0076] In other embodiments, the first group 21 can be a fixed group, the second group 22 can be a movable group, the second group 22 is a focusing group, and the second group 22 can move along the optical axis direction of the lens group 1 to achieve focusing on objects at different distances.

[0077] In still other embodiments, both the first group 21 and the second group 22 are movable groups, and both the first group 21 and the second group 22 can move along the optical axis direction of the lens group 1 to achieve zooming and focusing functions.

[0078] Specifically, the refractive index of the lens is an important parameter directly affecting the volume, weight, aberration correction ability, and imaging quality of the lens group 1. A lens with a high refractive index can achieve the same optical power with a smaller curvature. However, the refractive index is inversely proportional to the dispersion, and a lens with a high refractive index is prone to chromatic aberration. Therefore, in some alternative embodiments of the present application, the refractive index Nd of the first lens 11 is adjusted to satisfy: Nd ≤ 1.7, so as to balance that the first lens 11 can achieve the same optical power with a smaller curvature and has a smaller dispersion value.

[0079] In still other embodiments, the Abbe number Vd1 of the first lens 11 is adjusted to satisfy: Vd1 > 50, and the Abbe number Vd2 of the second lens 12 is adjusted to satisfy: Vd2 < 40, so that the first lens 11 and the second lens 12 cooperate to balance the overall lens group 1, which can achieve the same optical power with a smaller curvature and has a smaller dispersion value.

[0080] Specifically, the Abbe number is an index used to represent the dispersion ability of a transparent medium. The greater the refractive index of the medium, the more serious the dispersion, and the smaller the Abbe number; conversely, the smaller the refractive index of the medium, the less serious the dispersion, and the greater the Abbe number.

[0081] In some alternative embodiments, both the convex surface and the concave surface are aspherical surfaces, and the shape of the aspherical surface satisfies the formula:

[0082]

[0083] Among them, the parameter c = 1 / r; r is the perpendicular distance from the target point on the aspherical surface to the optical axis of the lens group; z represents the sagitta of the target point along the optical axis direction of the lens group; k is the conic coefficient of the aspherical surface, and Ai represents the i-th order aspherical coefficient.

[0084] In the embodiment of the present application, by restricting the types of the convex surface and the concave surface, the resolution of the lens group 1 can be effectively guaranteed, and further the shooting quality of the camera module can be guaranteed.

[0085] Specifically, the optical surface in the camera module mainly refers to the surface of the lens group 1. The surface of the lens group 1 is usually coated with one or more optical thin films, such as anti-reflection layers (anti-reflection films) and other coatings, to reduce the reflection of light on the surface of the lens group 1, improve the transmittance, and thus improve the quality of the image. The coating can help cancel out most of the reflected light, reduce the generation of ghost images and glare, and make the images taken in the night or dark environment clearer.

[0086] In the optical design of the camera module, the sagitta of the optical axis is an important parameter. It refers to the height difference between a certain position on the lens surface and its vertex. Specifically, the sagitta refers to the perpendicular distance between a certain point on the lens surface and the plane where the point is located (usually the plane where the optical axis is located).

[0087] In some alternative embodiments of the present application, the camera module further includes a second reflector 6, the second reflector 6 is disposed between the lens group 1 and the photosensitive chip 4, and the second reflector 6 is used to convert the light passing through the lens group 1 to the photosensitive chip 4; the second reflector 6 includes a second light incident surface 61, a second reflection surface 62, and a second light exit surface 63, the second light incident surface 61 is disposed opposite to the image side of the lens group 1, and the second light exit surface 63 is disposed opposite to the photosensitive chip 4; the second light exit surface 63 intersects with the second light incident surface 61.

[0088] In the embodiment of the present application, under the reflection of the second reflector 6, the second light exit surface 63 can intersect with the second light incident surface 61, so that the second light exit surface 63 can be a large surface. Since the second light exit surface 63 is disposed opposite to the photosensitive chip 4, the target surface of the optical system of the camera module can be increased, thereby increasing the light input amount, improving the low-light performance, and enhancing the shooting quality and user experience of the camera module.

[0089] Specifically, the low-light performance usually refers to the ability to still capture clear images or perform specific tasks in a relatively dark environment. The target surface of the optical system refers to the effective area on the photosensitive chip 4 for receiving light and forming images.

[0090] Specifically, the camera module in the embodiment of the present application can achieve a larger optical system target surface, can be adapted to 1-inch 1 / 1.12-inch and other photosensitive chips 4, and the amount of light entering is greatly increased. By using this type of photosensitive chip 4, a single lens group 1 can replace a double-shot lens group 1, while improving the overall competitiveness of the 3X~10X focal length segment.

[0091] Specifically, under the reflection effect of the second reflective member 6 , the position of the photosensitive chip 4 can be arranged more flexibly, which helps to break through the limitation of the thickness of the electronic device.

[0092] In the embodiment of the present application, under the action of the first reflector 3 with optical focal length, the light aperture and length of the second emitting element can be designed to be smaller. Moreover, during the shooting process, the light passing through the lens group 1 passes through the second light incident surface 61, can be reflected by the second reflective surface 62, and then emitted from the second light emitting surface 63 to the photosensitive chip 4. In this way, under the reflection action of the second reflector 6, the optical path of the camera module can be further increased to further reduce the volume of the camera module.

[0093] In some embodiments, the second reflective element 6 is an isosceles right prism, the second light incident surface 61 is perpendicular to the second light emitting surface 63, and the second light incident surface 61 is perpendicular to the optical axis of the lens group 1; the light incident from the second light incident surface 61 is reflected by the second reflective surface 62 and then emitted from the second light emitting surface 63.

[0094] In an embodiment of the present application, light passing through the lens group 1 can enter the second reflective element 6 from the second light incident surface 61, and can be emitted from the second light emitting surface 63 after being reflected once by the second reflective surface 62. The photosensitive chip 4 can be placed parallel to the optical axis direction of the lens group 1, so as to facilitate the increase of the optical system target surface of the photosensitive chip 4 and the reduction of the volume of the camera module.

[0095] Specifically, when the camera module is used in an electronic device, the optical axis direction of the lens group 1 can be consistent with the length direction of the electronic device, the second light incident surface 61 can be perpendicular to the width direction of the electronic device, and the second light exit surface 63 can be perpendicular to the thickness direction of the electronic device, so that the photosensitive chip 4 can be arranged perpendicular to the thickness direction of the electronic device, so that the optical system target surface of the photosensitive chip 4 is larger.

[0096] In other embodiments, the second reflective element 6 is a 30° right-angle prism, the second light incident surface 61 and the second reflective surface 62 are perpendicular, and the second light incident surface 61 is perpendicular to the optical axis of the lens group 1, and the second reflective surface 62 and the second light emitting surface 63 form an angle of 30°; the light incident from the second light incident surface 61 is first reflected by the second light emitting surface 63, and after second reflection by the second reflective surface 62, is emitted from the second light emitting surface 63.

[0097] In the embodiments of the present application, the light passing through the lens group 1 can enter the second reflector 6 from the second light incident surface 61, and after being reflected twice successively by the second light exit surface 63 and the second reflection surface 62, it can exit from the second light exit surface 63. The second light exit surface 63 can form an acute angle with the optical axis direction of the lens group 1, such that the photosensitive chip 4 can form an acute angle with the optical axis direction of the lens group 1, so that the optical system target surface of the photosensitive chip 4 is relatively large.

[0098] Some specific embodiments of the present application are illustrated by way of example as follows:

[0099] Embodiment 1:

[0100] As Figure 2 shown, the first reflector 3 is a prism with a focal power. The object side, i.e., the first light incident surface 31, is a convex surface, such that the first reflector 3 has a positive focal power. The image side, i.e., the first light exit surface 33, is a plane. The light enters the first light incident surface 31 along the S1 direction and exits the first light exit surface 33 along the S2 direction after being reflected by the first reflection surface 32. Among them, the relationship between the focal length f1 of the first reflector 3 and the focal length efl of the optical system satisfies: 2 ≤ f1 / efl ≤ 5; the relationship between the focal length efl of the optical system and the focal length f2 of the lens group 1 satisfies: efl ≤ f2.

[0101] The lens group 1 includes 5 aspherical lenses, which are, in sequence from the object side to the image side along the S2 direction, the first lens 11, the second lens 12, the third lens 13, the fifth lens 15, and the fourth lens 14. The first lens 11 has a positive focal power. The object side of the first lens 11 is a convex surface. The Abbe number Vd1 of the first lens 11 > 50. The second lens 12 has a negative focal power. The image side of the second lens 12 is a concave surface. The Abbe number Vd2 of the second lens 12 < 40. The third lens 13 has a positive focal power. The object side of the third lens 13 is a convex surface. The fifth lens 15 has a positive focal power. The fourth lens 14 has a negative focal power. The image side of the fourth lens 14 is a concave surface.

[0102] The second reflector 6 is an isosceles right prism. The second light incident surface 61 is perpendicular to the S2 direction, and the second light exit surface 63 is parallel to the S2 direction.

[0103] The basic specifications of the camera module in Embodiment 1 are as shown in Table 1-1 below:

[0104] efl F# f1 f2 Total length 31.5 mm 2.5 84.7 mm 60.7 mm 44.6 mm

[0105] Among them, efl is the system focal length of the camera module, F# is the system aperture of the camera module, f1 is the focal length of the first reflector, f2 is the focal length of the lens group, and the total length is the length of the camera module along the S2 direction.

[0106] In Example 1, the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens are as follows

[0107] Table 1-2:

[0108]

[0109] The coefficients of the aspheric higher-order terms of each lens surface in Example 1 are as shown in Table 1-3:

[0110]

[0111]

[0112] The axial chromatic aberration corresponding to Example 1 is as follows Figure 3 As shown, the defocus MTF (Modular Transfer Function) corresponding to Example 1 is as follows Figure 4 As shown, the MTF represents the reproduction ability of a lens group 1 for the contrast of the photographed object.

[0113] From Figure 3 The five solid curves in it are the color lights with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm respectively. It can be seen that the axial chromatic aberration of the lens group in this Example 1 is controlled within a very small range, and the chromatic aberration convergence is good. From Figure 4 It can be seen that at a spatial frequency of 100 lp / mm, the full-field MTF is greater than 0.5, indicating extremely high resolution.

[0114] Example 2:

[0115] The difference between Example 2 and Example 1 is that the second reflector 6 is a right-angle prism containing a 30-degree acute angle, and the light undergoes two reflections within the second reflector 6. The photosensitive element is parallel to the inclined surface of the right-angle prism. The top view of the system solution of Example 2 is as follows Figure 5 As shown.

[0116] The basic specifications of the camera module in Example 2 are as shown in Table 2-1 below:

[0117] efl F# f1 f2 Total length 31.5 mm 2.3 102 mm 47.49 mm 48.6 mm

[0118] Among them, efl is the system focal length of the camera module, F# is the system aperture of the camera module, f1 is the focal length of the first reflector, f2 is the focal length of the lens group, and the total length is the length of the camera module along the S2 direction.

[0119] In Example 2, the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens are as follows

[0120] Table 2-2:

[0121]

[0122]

[0123] Among them, the second light-emitting surface a1 is used as a reflecting surface, and the second light-emitting surface a2 is used as a light-emitting surface.

[0124] The aspheric high-order term coefficients of each lens surface in Embodiment 2 are shown in Table 2-3:

[0125]

[0126] The axial chromatic aberration corresponding to Embodiment 2 is as Figure 6 shown, and the defocus MTF corresponding to Embodiment 2 is as Figure 7 shown.

[0127] From Figure 6 Among them, the five solid curves are the color lights with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm. It can be seen that the axial chromatic aberration of the lens group in this Embodiment 2 is controlled within a very small range, and the chromatic aberration converges well. From Figure 7 it can be seen that at a spatial frequency of 100 lp / mm, the full-field MTF is greater than 0.5, having extremely high resolution.

[0128] Embodiment 3:

[0129] The difference between Embodiment 3 and Embodiment 1 is that: the lens group 1 is divided into two groups. The first group 21 near the object side is a fixed group, and the second group 22 near the image side is a focusing group. The focusing group moves along the S2 direction to achieve the focusing function. The first group 21 includes 3 lenses, and the second group 22 includes 2 lenses. The top view of the system scheme of Embodiment 3 is as Figure 8 shown.

[0130] The basic specifications of the camera module in Embodiment 3 are as follows in Table 3-1:

[0131] efl F# f1 f2 Total length 31.5 mm 2.4 136 mm 45.3 mm 44.6 mm

[0132] Among them, efl is the system focal length of the camera module, F# is the system aperture of the camera module, f1 is the focal length of the first reflecting member, f2 is the focal length of the lens group, and the total length is the length of the camera module along the S2 direction.

[0133] The surface type, curvature radius, thickness, refractive index, and Abbe number of each lens in Embodiment 3 are as

[0134] Table 3-2:

[0135]

[0136] The aspheric higher-order term coefficients of each lens surface in Embodiment 3 are shown in Table 3-3:

[0137]

[0138]

[0139] The axial chromatic aberration corresponding to Embodiment 3 is as Figure 9 shown, and the defocus MTF corresponding to Embodiment 3 is as Figure 10 shown.

[0140] From Figure 9 the five solid curves are the color lights with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm respectively. It can be seen that the axial chromatic aberration of the lens group in this Embodiment 2 is controlled within a very small range, and the chromatic aberration converges well. From Figure 10 it can be seen that at a spatial frequency of 100 lp / mm, the full-field MTF is greater than 0.5, having extremely high resolution.

[0141] Embodiment 4:

[0142] The difference between Embodiment 4 and Embodiment 1 is that: the lens group 1 is divided into two groups. The first group 21 near the object side is the focusing group, and the second group 22 near the image side is the fixed group. The focusing group moves along the S2 direction to achieve the focusing function. The first group 21 includes 3 lenses, and the second group 22 includes 2 lenses. The top view of the system scheme of Embodiment 3 is as Figure 11 shown.

[0143] The basic specifications of the camera module in Embodiment 4 are as follows in Table 3-1:

[0144] efl F# f1 f2 Total length 28.1 mm 2.39 130 mm 37.85 mm 44.2 mm

[0145] Among them, efl is the system focal length of the camera module, F# is the system aperture of the camera module, f1 is the focal length of the first reflector, f2 is the focal length of the lens group, and the total length is the length of the camera module along the S2 direction.

[0146] 0]The surface type, curvature radius, thickness, refractive index, and Abbe number of each lens in Embodiment 4 are as

[0147] Table 4-2:

[0148]

[0149]

[0150] The aspheric higher-order term coefficients of each lens surface in Embodiment 4 are shown in Table 4-3:

[0151]

[0152] The axial chromatic aberration corresponding to Example 4 is as Figure 12 shown, and the defocus MTF corresponding to Example 4 is as Figure 13 shown.

[0153] From Figure 12 Among them, the five solid lines are the color lights with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm. It can be seen that in this Example 2, the axial chromatic aberration of the lens group is controlled within a very small range, and the chromatic aberration convergence is good. From Figure 13 it can be seen that at a spatial frequency of 100 lp / mm, the full-field MTF is greater than 0.5, having extremely high resolution.

[0154] Example 5:

[0155] The difference between Example 5 and Example 1 is that: the lens group 1 is divided into two groups, both of which are movable groups and can move along the S2 direction to achieve zooming and focusing functions. The top view of the system solution of Example 5 is as Figure 14 shown.

[0156] The camera module described in the embodiments of the present application has at least the following advantages:

[0157] In the embodiments of the present application, the first light incident surface can transmit light to the first reflection surface, the first reflection surface can reflect light to the first light output surface, and the first light output surface can transmit light to the lens group, which can increase the optical path of the camera module. Moreover, the first light incident surface is a convex surface, so that the first reflection member has a optical power, which can shorten the focal length of the camera module. In this way, under the action of the first reflection member with optical power, the length of the lens group and the overall length of the camera module can be reduced, and further the volume of the camera module can be reduced, which is beneficial to realizing the thin and light design of the electronic device.

[0158] In a second aspect, the embodiments of the present application also disclose an electronic device, which may include: a housing; and the above-mentioned camera module, and the camera module is assembled to the housing.

[0159] In the embodiments of the present application, the electronic device includes but is not limited to mobile phones, computers, smart watches, or cameras, etc.

[0160] Specifically, the housing is the outer shell of the electronic device and can be used to protect the camera module.

[0161] The electronic device described in the embodiments of the present application can achieve the same beneficial effects as the above-mentioned camera module, which will not be elaborated herein.

[0162] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0163] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An imaging module having an optical system, characterized in that, The optical system includes: a lens group (1); a first reflector (3), the first reflector (3) having a focal power, the first reflector (3) including a first incident light surface (31), a first reflecting surface (32), and a first outgoing light surface (33), the first incident light surface (31) being a convex surface, the first outgoing light surface (33) being opposite to the object side surface of the lens group (1); the focal length of the first reflector (3) is f1, the focal length of the optical system is efl, and the relationship between the focal length f1 of the first reflector (3) and the focal length efl of the optical system satisfies: 2 ≤ f1 / efl ≤ 5; a photosensitive chip (4), the photosensitive chip (4) being correspondingly arranged on the image side of the lens group (1) for receiving light passing through the lens group (1).

2. The camera module according to claim 1, wherein The first reflecting surface (32) forms an acute angle with the optical axis of the lens group (1), and the orientation of the first outgoing light surface (33) is parallel to the optical axis of the lens group (1); wherein, light enters from the first incident light surface (31), is reflected by the first reflecting surface (32), and then exits along a direction parallel to the optical axis of the lens group (1).

3. The camera module according to claim 1, wherein The focal length of the lens group (1) is f2, and the relationship between the focal length efl of the optical system and the focal length f2 of the lens group (1) satisfies: efl ≤ f2.

4. The camera module according to claim 1, wherein The lens group (1) includes a first lens (11), a second lens (12), a third lens (13), and a fourth lens (14) arranged in sequence along its optical axis; the object side surface of the first lens (11) is opposite to the first outgoing light surface (33), and the image side surface of the fourth lens (14) is correspondingly arranged with the photosensitive chip (4); the first lens (11) has a positive focal power, and the object side surface of the first lens (11) is a convex surface; the second lens (12) has a negative focal power, and the image side surface of the second lens (12) is a concave surface; the third lens (13) has a positive focal power, and the object side surface of the third lens (13) is a convex surface; the fourth lens (14) has a negative focal power, and the image side surface of the fourth lens (14) is a concave surface.

5. The imaging module according to claim 4, wherein, At least one fifth lens (15) is arranged between the third lens (13) and the fourth lens (14).

6. The imaging module according to claim 5, wherein, Some of the first lens (11), the second lens (12), the third lens (13), the fourth lens (14), and the fifth lens (15) form a first group (21), and the other part forms a second group (22); both the first group (21) and the second group (22) are arranged between the first reflector (3) and the photosensitive chip (4), and the first group (21) is arranged between the first reflector (3) and the second group (22); at least one of the first group (21) and the second group (22) can move along the optical axis direction of the lens group (1).

7. The imaging module according to any one of claims 1-6, characterized in that, The first outgoing light surface (33) is a plane or a concave surface.

8. The camera module according to claim 1, wherein The camera module further includes a second reflector (6), the second reflector (6) is disposed between the lens group (1) and the photosensitive chip (4), and the second reflector (6) is configured to convert the light passing through the lens group (1) to the photosensitive chip (4); The second reflector (6) includes a second light incident surface (61), a second reflection surface (62) and a second light exit surface (63), the second light incident surface (61) is disposed opposite to the image side of the lens group (1), and the second light exit surface (63) is disposed opposite to the photosensitive chip (4); The second light exit surface (63) intersects with the second light incident surface (61).

9. The imaging module according to claim 8, wherein The second reflector (6) is an isosceles right prism, the second light incident surface (61) is perpendicular to the second light exit surface (63), and the second light incident surface (61) is perpendicular to the optical axis of the lens group (1); The light incident from the second light incident surface (61) is reflected by the second reflection surface (62) and then exits from the second light exit surface (63).

10. The camera module according to claim 8, wherein The second reflector (6) is a right prism including 30°, the second light incident surface (61) is perpendicular to the second reflection surface (62), the second light incident surface (61) is perpendicular to the optical axis of the lens group (1), and an included angle between the second reflection surface (62) and the second light exit surface (63) is 30°; The light incident from the second light incident surface (61) is first reflected by the second light exit surface (63), and then second reflected by the second reflection surface (62), and then exits from the second light exit surface (63).

11. An electronic device, characterized in that, Comprising: A housing; A camera module, the camera module being the camera module according to any one of claims 1-10, and the camera module is assembled in the housing.

Images