Lens, camera module, and electronic device

Abstract

A lens (10), a camera module (100), and an electronic device. The lens (10) comprises a first lens group (11), a first prism (12), a second lens group (13), a second prism (14), a third lens group (15), and a third prism (16) which are sequentially arranged from the object side to the image side. The first lens group (11) has positive focal power; a first surface (122) of the first prism (12) is used for deflecting a light beam and then transmitting same to the second lens group (13); the second lens group (13) has negative focal power; the second prism (14) has at least two second surfaces, and each second surface is used for deflecting the light beam and then transmitting same to the third lens group (15); the third lens group (15) has negative focal power; the third prism (16) has at least three third surfaces, and each third surface is used for deflecting the light beam and then transmitting same outward; and the first surface (122) is parallel to a first direction (X-axis), the second surfaces and the third surfaces are all parallel to a second direction (Z-axis), and the first direction (X-axis) and the second direction (Z-axis) are perpendicular to each other.

Description

Lens, camera module and electronic device

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202411249186.4, filed on September 5, 2024, and entitled "Lens, camera module and electronic device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of optical technology, and in particular to a lens, a camera module and an electronic device. BACKGROUND

[0004] At present, the camera module has become one of the important components of electronic devices such as mobile phones and tablet computers. Users can easily obtain the images they want through the camera module of the electronic device to meet the needs of people to take photos and videos. Among them, how to design the camera module to improve the user experience has become an important topic in the industry.

[0005] The long-focus lens can effectively improve the long-focus photography experience of the user. The use of the long-focus lens can improve the clarity when shooting long-distance, or can also improve the night shooting experience. There is a problem of small telephoto ratio in the current long-focus lens, which makes the size of the lens too large, which is not conducive to application in electronic devices such as mobile phones and tablet computers with small thickness size. Therefore, how to improve the telephoto ratio of the lens has become a technical problem to be solved. SUMMARY

[0006] The present application provides a lens with a large telephoto ratio, which is conducive to miniaturization design, a camera module and an electronic device.

[0007] In a first aspect, the present application provides a lens, comprising a first lens group, a first prism, a second lens group, a second prism, a third lens group and a third prism arranged in order from an object side to an image side. The first lens group has positive optical power, and the first lens group is used to transmit the light beam converging on the object side to the first prism. The first prism has a first surface, and the first surface is used to transmit the light beam after being folded to the second lens group. The second lens group has negative optical power, and the second lens group is used to transmit the light beam after being diverged to the second prism. The second prism has at least two second surfaces, and the at least two second surfaces are used to transmit the light beam after being folded in order to the third lens group. The third lens group has negative optical power, and the third lens group is used to transmit the light beam after being diverged to the third prism. The third prism has at least three third surfaces, and the at least three third surfaces are used to transmit the light beam after being folded in order to be transmitted outward. Wherein, the first surface is parallel to the first direction, the second surface and the third surface are parallel to the second direction, and the first direction and the second direction are perpendicular to each other.

[0008] In the lens provided in the present application, by adopting the first lens group, the second lens group and the third lens group, and reasonably matching the positive and negative focal lengths of each lens group, a large telephoto ratio can be achieved. In addition, in combination with the first prism, the second prism and the third prism, the physical length of the lens can be effectively reduced, which is conducive to achieving a large telephoto ratio and miniaturization design of the lens.

[0009] In an example, the optical axis of the second lens group is parallel to the third direction. The third direction is perpendicular to the first direction and the second direction. That is, the first surface, the second surface and the third surface can deflect the light beam in the plane perpendicular to the third direction, which helps to reduce the length of the lens in the third direction, and also increases the telephoto ratio of the lens.

[0010] In an example, the optical axis of the third lens group is at an angle to the optical axis of the second lens group. This helps to reduce the length of the lens (i.e. the size in the third direction), and ensures that the second prism has a larger size to provide more reflection surfaces.

[0011] In an example, the optical axis of the first lens group is perpendicular to the optical axis of the second lens group and the optical axis of the third lens group. Alternatively, it can be understood that the lens can adopt a periscope type arrangement, so that the size of the lens can be reasonably utilized in all directions of the first direction, the second direction and the third direction, which helps to reduce the size of the lens in a single direction, and is conducive to achieving miniaturization design of the lens.

[0012] In an example, the second prism includes a first incident surface and a first exit surface. The first reflection surface is included in at least two second surfaces of the second prism, and the first reflection surface and the first exit surface are the same surface of the second prism.

[0013] In a specific arrangement, the angle θ1 between the first incident surface and the first exit surface satisfies: 40°≤θ1≤60°, so that the first reflection surface is a total reflection surface, that is, the light beam can be totally reflected when passing through the first reflection surface.

[0014] In a specific arrangement, the refractive index N1 of the second prism satisfies: so that the first reflection surface is a total reflection surface. In addition, by reasonably matching the angle between the first incident surface and the first exit surface and the refractive index of the second prism, the size of the second prism can also be reduced, which is conducive to achieving miniaturization and a high telephoto ratio of the lens.

[0015] In a specific arrangement, the second prism further includes a second reflecting surface in the at least two surfaces, and an included angle between the second reflecting surface and the first exit surface is θ2, where θ1=2*θ2, so that light reflected from the second reflecting surface can be perpendicular to the first exit surface to be transmitted, so as to improve the light beam quality and avoid adverse problems such as chromatic aberration.

[0016] In an example, the first incident surface is towards the second mirror group, the first exit surface is towards the third mirror group, and the light beam transmitted from the first incident surface is transmitted from the first exit surface after passing through the first reflecting surface and the second reflecting surface, so as to improve the light beam quality and avoid adverse problems such as chromatic aberration.

[0017] In a specific arrangement, the first incident surface is perpendicular to the optical axis of the second mirror group, so as to improve the light beam quality and avoid adverse problems such as chromatic aberration.

[0018] In a specific arrangement, the first exit surface is perpendicular to the optical axis of the third mirror group, so as to improve the light beam quality and avoid adverse problems such as chromatic aberration.

[0019] In an example, the third prism includes a second incident surface and a second exit surface. The third reflecting surface is included in the at least three third surfaces of the second prism, and the third reflecting surface and the second exit surface are the same surface of the third prism.

[0020] In a specific arrangement, an included angle θ3 between the second incident surface and the second exit surface satisfies 40°≤θ3≤60°, so that the third reflecting surface is a total reflecting surface, i.e., the light beam can be totally reflected when passing through the third reflecting surface.

[0021] In a specific arrangement, a refractive index N2 of the second prism satisfies so that the third reflecting surface is a total reflecting surface. In addition, by reasonably matching the included angle between the second incident surface and the second exit surface and the refractive index of the third prism, the size of the third prism can be reduced, which is beneficial to realize the miniaturization and higher telephoto ratio of the lens.

[0022] In an example, the third prism includes a second incident surface and a second exit surface, and an included angle between the second incident surface and the second exit surface is θ3, where θ1 and θ3 are equal, so as to effectively reduce the length of the lens.

[0023] In an example, the third prism further includes a fourth reflecting surface in the at least three third surfaces, and the fourth reflecting surface and the second incident surface are the same surface of the third prism.

[0024] In a specific arrangement, the third prism further includes a fifth reflecting surface in the at least three surfaces. An included angle between the fifth reflecting surface and the second exit surface is equal to an included angle between the fifth reflecting surface and the second incident surface, so that the fourth reflecting surface is a total reflecting surface, i.e., the light beam can be totally reflected when passing through the fourth reflecting surface.

[0025] In an example, the second incident surface is towards the third mirror group, and the light beams passing through the second incident surface are transmitted from the second exit surface after passing through the third reflecting surface, the fifth reflecting surface and the fourth reflecting surface respectively. That is, the light beams are transmitted after passing through the third prism for three times, which can effectively increase the propagation path of the light beams.

[0026] In an example, the second incident surface is perpendicular to the optical axis of the third mirror group.

[0027] In a specific arrangement, the first prism is a right-angle prism, so that the first prism has a good deflection effect on the light beams and has the advantages of small size, etc.

[0028] In an example, the lens further comprises a fourth prism, and the fourth prism is located on the image side of the third prism. The fourth prism is a right-angle prism or a Schmidt prism. By configuring the fourth prism, the propagation path of the light beams can be further increased, and the transmission direction of the light beams can be flexibly adjusted, which can improve the design flexibility of the lens.

[0029] In an example, the second mirror group is movable along the optical axis thereof, so that the lens has the function of focal length adjustment, which can improve the focusing effect of the lens at different focal lengths.

[0030] In a second aspect, the present application provides a camera module, comprising a photosensitive element and any of the lenses described above, and the photosensitive element is arranged on the image side of the lens. By equipping the lens described above, the camera module has a high telephoto ratio, and has the advantages of small size.

[0031] In a third aspect, the present application provides an electronic device, comprising a shell and the camera module described above, and the camera module is arranged in the shell. By equipping the camera module described above, the electronic device has good long-range shooting performance, and is conducive to realizing the lightweight, miniaturized design of the electronic device. BRIEF DESCRIPTION OF DRAWINGS

[0032] FIG. 1 is a schematic diagram of the back structure of a mobile phone according to an embodiment of the present application;

[0033] FIG. 2 is a schematic diagram of the partial cross-sectional structure of A-A in FIG. 1;

[0034] FIG. 3 is a schematic diagram of the structure of a lens according to an embodiment of the present application;

[0035] FIG. 4 is a schematic diagram of a lens according to an embodiment of the present application;

[0036] FIG. 5 is a schematic diagram of another lens according to an embodiment of the present application;

[0037] FIG. 6 is a schematic diagram of the structure of a lens according to an embodiment of the present application;

[0038] FIG. 7 is a structural schematic diagram of another view of a lens according to an embodiment of the present application;

[0039] FIG. 8 is a structural schematic diagram of a second prism in FIG. 7;

[0040] FIG. 9 is a structural schematic diagram of a third prism in FIG. 7;

[0041] FIG. 10 is a structural schematic diagram of another lens according to an embodiment of the present application;

[0042] FIG. 11 is a structural schematic diagram of another view of another lens according to an embodiment of the present application;

[0043] FIG. 12 is a MTF curve diagram of a lens according to an embodiment of the present application;

[0044] FIG. 13 is another MTF curve diagram of a lens according to an embodiment of the present application;

[0045] FIG. 14 is a structural schematic diagram of another lens according to an embodiment of the present application;

[0046] FIG. 15 is a structural schematic diagram of another lens according to an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be described in further detail below with reference to the drawings.

[0048] In order to facilitate understanding of the lens and camera module provided by the embodiments of the present application, the application scenarios thereof will be introduced first below.

[0049] The lens and camera module provided by the embodiments of the present application can be applied in electronic devices with shooting function requirements, such as cameras, mobile phones, tablet computers, notebook computers, wearable devices (such as smart watches) and the like. The following will take the mobile phone as an example for illustrative description. When the lens and camera module are applied in other types of electronic devices, the setting mode of the lens and camera module can be the same or similar to the mobile phone embodiment, and will not be described herein again.

[0050] A back view of a mobile phone is shown in FIG. 1, and a cross-sectional structural schematic diagram of A-A in FIG. 1 is shown in FIG. 2.

[0051] Specifically, please refer to FIG. 1 and FIG. 2. The mobile phone includes a shell 01, a display screen 02 and a camera module 100. The shell 01 can include a middle frame 011 and a back cover 012. The display screen 02 and the back cover 012 are respectively installed on opposite sides of the middle frame 011, and the back cover 012 and the middle frame 011 can enclose a space for accommodating the camera module 100. The light-in side (or object side) of the camera module 100 is arranged opposite the camera window 0121 provided on the back cover 012, so as to ensure that the camera module 100 can receive light emitted or reflected by the scene outside the shell 01.

[0052] The camera window 0121 is provided with a protective cover plate 0122 at the opening thereof, and the protective cover plate 0122 is usually made of glass, sapphire or other materials with good light transmission and good structural strength. The protective cover plate 0122 can ensure the sealing of the camera window 0121 and prevent dust and other impurities from the outside from entering the shell 01 to damage the camera module 100 and other devices in the shell 01.

[0053] The space enclosed by the display screen 02 and the middle frame 011 can be used to accommodate a circuit board 03, a processor (not shown in the figure) and other devices.

[0054] The camera module 100 includes a lens 10 and a photosensitive element 101. The lens 10 includes a plurality of lenses, so that the lens 10 can perform convergence, divergence or folding of the light beam. The photosensitive element 101 is located on the light-out side (or image side) of the lens 10, and the photosensitive surface of the photosensitive element 101 coincides with the focal plane of the lens 10. The photosensitive element 101, also known as an image sensor, is a kind of semiconductor chip for converting optical signals into electrical signals. The photosensitive surface of the photosensitive element 101 contains hundreds of thousands to millions of photodiodes, which will generate electric charges when exposed to light. The photosensitive element 101 can be a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS), and the specific type of the photosensitive element 101 is not limited in the present application.

[0055] In actual application, the external light beam can be transmitted to the photosensitive surface of the photosensitive element 101 after being converged, diverged or folded by the lens 10. The photosensitive element 101 converts the optical signal into an electrical signal and transmits it to the processor, which can perform operation processing on the electrical signal and store it. Alternatively, the processor can also transmit the electrical signal to the display screen 02 for display on the display screen 02. The specific processing method of the electrical signal is not limited in the present application.

[0056] The camera module 100 in the embodiments of the present application can be installed at the upper left corner, the upper middle or the upper right corner of the back of the mobile phone, which is not specifically limited here. In addition to being installed on the back of the mobile phone and used as a rear camera module, the camera module 100 can also be installed on the front of the mobile phone and used as a front camera module of the mobile phone.

[0057] In general, one or more camera modules 100 can be included in the mobile phone in actual application. Alternatively, one or more lenses 10 can be included in one camera module 100, and the photosensitive element 101 can be one or more. In addition, the camera module 100 or the lens 10 can be located on the back of the mobile phone or on the front of the mobile phone. In specific settings, the setting mode, number and position of the camera module 100 can be reasonably selected according to actual needs, and the present application does not limit this.

[0058] The long-focus lens has a longer focal length, which can effectively improve the clarity when shooting a long distance. Therefore, more and more mobile phones currently begin to be equipped with long-focus lenses to obtain better long-distance shooting performance.

[0059] The current long-focus lens has a small telephoto ratio, which makes the size of the lens 10 too large, which is not conducive to application in mobile phones, tablet computers and other space-constrained electronic devices.

[0060] Therefore, the embodiments of the present application provide a lens with a large telephoto ratio, which is conducive to miniaturization design.

[0061] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0062] As shown in FIG. 3, in an example provided in the present application, the camera module 100 includes a lens 10 and a photosensitive element 101. The lens 10 includes, in order from the object side to the image side, a first lens group 11, a first prism 12, a second lens group 13, a second prism 14, a third lens group 15, and a third prism 16. The first lens group 11 has positive optical power, and is configured to transmit the light beam from the object side to the first prism 12 after converging the light beam. The first prism 12 is configured to transmit the light beam to the second lens group 13 after folding the light beam. The second lens group 13 has negative optical power, and is configured to transmit the light beam to the second prism 14 after diverging the light beam. The second prism 14 is configured to transmit the light beam to the third lens group 15 after folding the light beam. The third lens group 15 has negative optical power, and is configured to transmit the light beam to the third prism 16 after diverging the light beam. The third prism 16 is configured to transmit the light beam to the photosensitive surface of the photosensitive element 101 after folding the light beam. Among them, the lens groups in the lens 10 are mainly used to converge, diverge and other processes on the light beam, so as to optimize the quality of the light beam. The prism is mainly used to fold the light beam, so as to change the propagation direction of the light beam. In addition, the light beam can also produce at least one reflection in the prism, so as to increase the propagation path of the light beam, which is beneficial to reduce the size of the lens 10. The photosensitive element 101 is used to convert the optical signal carrying image information into an electrical signal, so as to perform operation, storage, transmission and other processes on the image information.

[0063] In the examples provided in the present application, by adopting the first lens group 11, the second lens group 13 and the third lens group 15, and reasonably matching the positive and negative optical powers of each lens group, a larger telephoto ratio can be achieved. In addition, in combination with the first prism 12, the second prism 14 and the third prism 16, the physical length of the lens 10 can be effectively reduced, which is beneficial to realize the large telephoto ratio and miniaturization design of the lens 10.

[0064] In order to facilitate understanding, the following first explains and describes some technical terms of the lens 10.

[0065] Focal power, represented as the reciprocal of the image-side focal length (approximately recognized as the refractive index of air is 1), represents the ability of the lens 10 to fold light rays. The lens or lens group with positive focal power has a positive focal length, which has the effect of converging the light beam. The lens or lens group with negative focal power has the effect of diverging the light beam.

[0066] The positive lens is also called converging lens or convex lens, which has the effect of converging the light beam. The convex lens includes double convex, plano-convex and convex-concave, etc.

[0067] The negative lens is also called diverging lens or concave lens, which has the effect of diverging the light beam. The concave lens includes double concave, plano-concave, convex-concave, etc.

[0068] For example, as shown in FIG. 3, in the examples provided in the present application, the first lens group 11 includes one positive lens. In actual applications, the positive lens in the first lens group 11 can be any of the above-mentioned positive lenses. Alternatively, the first lens group 11 can also include multiple lenses, which can include positive lenses and negative lenses. That is, when the first lens group 11 includes multiple lenses, the multiple lenses can collectively form a lens group with positive focal power.

[0069] The second lens group 13 includes two negative lenses, namely negative lens 131 and negative lens 132. In actual applications, the negative lens in the second lens group 13 can be any of the above-mentioned negative lenses. Alternatively, the second lens group 13 can also include one or more lenses, which can include positive lenses and negative lenses. That is, when the second lens group 13 includes multiple lenses, the multiple lenses can collectively form a lens group with negative focal power.

[0070] The third lens group 15 includes two negative lenses, namely negative lens 151 and negative lens 152. In actual applications, the negative lens in the third lens group 15 can be any of the above-mentioned negative lenses. Alternatively, the third lens group 15 can also include one or more lenses, which can include positive lenses and negative lenses. That is, when the third lens group 15 includes multiple lenses, the multiple lenses can collectively form a lens group with negative focal power.

[0071] In summary, in actual applications, the number and type of lenses included in the first lens group 11, the second lens group 13 and the third lens group 14 can be reasonably set according to actual needs, so that the first lens group 11 has positive focal power, the second lens group 13 has negative focal power, and the third lens group 14 has negative focal power, which will not be described here.

[0072] Optical axis, refers to the symmetry axis of the optical system, such as the optical axis 110 of the first lens group 11, which is the axis passing through the centers of each lens in the first lens group 11.

[0073] Focal length, is a measure of the convergence or divergence of light in an optical system. Focal length is divided into image-side focal length and object-side focal length. The image-side focal length is the distance from the image-side principal plane to the image-side focal point, and similarly, the object-side focal length is the distance from the object-side principal plane to the object-side focal point. Unless otherwise specified, the focal length in the embodiments of the present application refers to the image-side focal length.

[0074] Image plane, located on the image side of all lens groups and prisms in the lens 10, and the position where light rays form an image after passing through each lens group and prism in the lens 10.

[0075] Total track length (TTL), refers to the optical path length from the surface closest to the object side of the lens 10 to the image plane.

[0076] Focusing, in particular, refers to adjusting the position of the lens group in the lens 10 to control the image distance, so that the image plane of the lens 10 falls on the photosensitive element 101, so that the imaging of the camera module 100 is the clearest.

[0077] Internal focusing (IF) refers to the movement of an internal focusing lens group in the optical lens 10 to complete focusing when the optical lens 10 is focused. The total length (TTL) of the optical lens 10 remains unchanged during focusing.

[0078] In the examples provided in the present application, the second lens group 13 can move along its optical axis 130, thereby achieving the focusing effect described above. It can be understood that in specific settings, the second lens group 13 can be moved by a voice coil motor or other driving device. In specific settings, the focusing effect can be achieved according to the currently more commonly used structure and manner, which will not be repeated here.

[0079] Effective focal length (EFFL) refers to the length of the optical path between the convergence point of the lens and the principal plane. The principal plane refers to the intersection of the reverse extension line of the outgoing light and the incident light, and the plane is perpendicular to the optical axis.

[0080] Telephoto ratio refers to the ratio of effective focal length to total length, i.e. EFFL / TTL. The telephoto ratio is an important indicator for measuring the telephoto performance of an optical system. The larger the telephoto ratio, the stronger the telephoto capability of the lens 10, and the farther the object can be photographed.

[0081] For example, as shown in FIG. 4, in one example provided in the present application, the lens 10 includes two lenses G0 and G1. Among them, the lens G0 has positive refractive power, and the lens G1 has negative refractive power. In the figure, the dotted line represents the optical axis of the lens 10. The light beam S0 parallel to the optical axis converges through the lens G0 and transmits the light beam S1. The light beam S1 diverges through the lens G1 and transmits the light beam S2, and finally transmits to the image plane IMA.

[0082] In FIG. 4, TTL is the total length of the lens 10. In the above explanation of effective focal length, the light beam S0 can be considered as incident light, and the light beam S2 can be considered as outgoing light. The intersection of S2 and the optical axis is the convergence point of the lens. The reverse extension line of the light beam S2 is a virtual line, and the intersection of the reverse extension line and the plane perpendicular to the optical axis is the principal plane.

[0083] As shown in FIG. 5, in another example provided by the present application, the lens 10 includes three lenses G0, G1 and G2. Among them, the lens G0 has positive refractive power, the lens G1 has negative refractive power, and the lens G2 has negative refractive power. In the figure, the dotted line represents the optical axis of the lens 10. The light beam S0 parallel to the optical axis converges through the lens G0 and transmits the light beam S1. The light beam S1 diverges through the lens G1 and transmits the light beam S2, the light beam S2 diverges through the lens G2 and transmits the light beam S3, and finally transmits to the image plane IMA.

[0084] In FIG. 5, TTL is the total length of the lens 10. The dashed line is the reverse extension line of the light beam S3, and the intersection point of the reverse extension line to the light beam S0 represents the focusing position of the lens 10. Therefore, EFFL is the effective focal length of the lens 10.

[0085] By comparing FIG. 4 and FIG. 5, it can be seen that the telephoto ratio EFFL / TTL of the lens 10 in FIG. 5 is obviously larger than that of the lens 10 in FIG. 4.

[0086] As shown in FIG. 3, in the example provided by the present application, the lens 10 includes a first lens group 11, a second lens group 13 and a third lens group 15 arranged in order from the object side to the image side, and the first lens group 11 has positive refractive power, the second lens group 13 has negative refractive power, and the third lens group 15 has negative refractive power. So that the lens 10 has a large telephoto ratio, the telephoto capability of the lens 10 is strong, and can shoot farther objects.

[0087] In addition, in the example provided by the present application, by configuring the first prism 12, the second prism 14 and the third prism 16, it is also helpful to reduce the size of the lens 10 and the camera module 100, which is conducive to realizing the large telephoto ratio and small size design of the lens 10.

[0088] For ease of understanding, in the following examples, a spatial rectangular coordinate system will be introduced to exemplarily describe the spatial positions of the components in the lens 10.

[0089] As shown in FIG. 1, FIG. 2 and FIG. 3, the length direction of the mobile phone coincides with the Y axis (or the third direction), the width direction of the mobile phone coincides with the X axis (or the first direction), and the thickness direction of the mobile phone coincides with the Z axis (the second direction).

[0090] At present, in order to obtain a good use feeling, the thickness size of the mobile phone is usually small, so the space in the Z axis direction inside the mobile phone is relatively cramped.

[0091] In the examples provided in the present application, the optical axis 110 of the first lens group 11 is consistent with the Z axis, so that the external light beam can be effectively transmitted to the first lens group 11. In addition, by configuring the first prism 12, the light beam transmitted through the first lens group 11 can be bent by about 90°, so that the light beam propagates in the plane XOY perpendicular to the Z axis.

[0092] Specifically, please refer to FIG. 6 and FIG. 7. The first prism 12 has an incident surface 121, a reflecting surface 122 (or a first surface) and an exit surface 123. The optical axis 110 of the first lens group 11 is consistent with the Z axis, and the optical axis 130 of the second lens group 13 is consistent with the Y axis, that is, the optical axis 110 of the first lens group 11 and the optical axis 130 of the second lens group 13 are perpendicular to each other. The first prism 12 is a right-angle prism. The angle between the incident surface 121 and the exit surface 123 is 90°. In addition, in order to realize total reflection of the reflecting surface 122 and the light beam can be transmitted vertically to the exit surface 123, the angle between the reflecting surface 122 and the incident surface 121 and the exit surface 123 is 45°.

[0093] In addition, in order to ensure that the light beam transmitted through the first lens group 11 can be vertically incident into the first prism 12, the incident surface 121 is towards the first lens group 11, and the incident surface 121 is perpendicular to the optical axis 110 of the first lens group 11, so as to prevent adverse problems such as chromatic aberration. Correspondingly, in order to ensure that the light beam transmitted through the first prism 12 can be effectively transmitted to the second lens group 13, the exit surface 123 is perpendicular to the optical axis 130 of the second lens group 13, so as to prevent adverse problems such as chromatic aberration.

[0094] In summary, in the examples provided in the present application, by equipping the first prism 12, the light beam can be effectively transmitted from the first lens group 11 to the second lens group 13. In addition, the optical axis 110 of the first lens group 11 is consistent with the Z axis, so that the larger area of the back plate in the mobile phone can be effectively utilized, which helps to improve the light receiving area of the first lens group 11, thereby ensuring the light amount of the lens 10. In addition, the optical axis 130 of the second lens group 13 is perpendicular to the Z axis, so that the lens 10 can effectively utilize the length and width dimensions of the mobile phone, which helps to effectively configure the lens 10 in the mobile phone.

[0095] As shown in FIG. 7, the light beam is transmitted to the second prism 14 after being diffused by the second lens group 13. The second prism 14 has a plurality of second surfaces for reflecting the light beam. The second surfaces can effectively increase the path of the light beam in the second prism 14, thereby helping to reduce the distance between the second lens group 13 and the third lens group 15. Alternatively, it can be understood that, when the second prism 14 is not configured, in order to ensure the diffusion effect or the telephoto ratio of the second lens group 13 on the light beam, the distance between the second lens group 13 and the third lens group 15 needs to be reasonably increased. However, after increasing the distance between the second lens group 13 and the third lens group 15, the size of the lens 10 will be obviously increased, which is not conducive to the miniaturization design of the lens 10.

[0096] In the examples provided in the present application, by configuring the second prism 14 between the second lens group 13 and the third lens group 15, and the second prism 14 has at least two second surfaces for reflection, the propagation path of the light beam in the second prism 14 can be effectively increased, which helps to reduce the distance between the second lens group 13 and the third lens group 15, and effectively balances the large telephoto ratio and miniaturization of the lens 10. In addition, the second prism 14 can also perform folding processing on the light beam, which can improve the flexibility of the position layout of the second lens group 13 and the third lens group 15, which also helps the miniaturization design of the lens 10.

[0097] Specifically, the second prism 14 includes a first incident surface 141, a reflection surface 142, a reflection surface 143, and a first exit surface 144. The first incident surface 141 is directed towards the second lens group 13, and the first incident surface 141 is perpendicular to the optical axis 130 of the second lens group 13, so that the light beam transmitted from the second lens group 13 can be effectively transmitted into the second prism 14 to prevent adverse problems such as chromatic aberration. The first exit surface 144 is directed towards the third lens group 15, and the first exit surface 144 is perpendicular to the optical axis 150 of the third lens group 15, so that the light beam transmitted from the second prism 14 can be effectively transmitted to the third lens group 15 to prevent adverse problems such as chromatic aberration.

[0098] The light beam enters the second prism 14 through the first incident surface 141, is reflected by the reflection surface 142, is reflected by the reflection surface 143, and is reflected by the first exit surface 144. The first exit surface 144 and the reflection surface 142 are the same surface of the second prism 14, and therefore, in order to enable the surface to simultaneously achieve good reflection and transmission functions, the surface needs to satisfy the total reflection condition.

[0099] For example, the included angle θ1 between the first incident surface 141 and the first exit surface 144 (the reflecting surface 142) satisfies: 40°≤θ1≤60°. It should be noted that the smaller the angle θ1, the smaller the size of the second prism 14 in the Y-axis direction. The larger the angle θ1, the larger the size of the second prism 14 in the Y-axis direction. Therefore, when the second prism 14 is arranged, the specific value of the included angle θ1 can be reasonably set according to the actual space requirement, which will not be repeated here.

[0100] In addition, in actual application, the turning ability of the second prism 14 to the light beam is also related to the refractive index of the second prism 14. In an example, the refractive index N1 of the second prism 14 can satisfy:

[0101] That is, in order to make the reflecting surface 142 a total reflecting surface, the angle θ1 and the refractive index of the second prism 14 can be reasonably set.

[0102] In an example, in order to ensure that the reflecting surface 143 can effectively reflect the light beam, in specific application, a reflecting film can be configured on the reflecting surface 143. The reflecting film 143 can be configured according to the type commonly used at present, which is not limited in the present application.

[0103] In addition, as shown in FIGS. 7 and 8, in order to ensure that the light beam can be perpendicular to the exit surface, the included angle θ2 between the reflecting surface and the reflecting surface satisfies θ1=2*θ2.

[0104] It should be noted that in the example provided in FIG. 7, the example is exemplarily explained by taking the second prism 14 including two reflecting surfaces as an example. In other examples, three or more reflecting surfaces can be configured in the second prism 14. Alternatively, it can be understood that the light beam can be reflected at least twice in the second prism 14, so as to increase the propagation path of the light beam in the second prism 14.

[0105] In some embodiments, the first incident surface 141, the reflecting surface 142, and the reflecting surface 143 of the second prism 14 can be connected two by two, in other words, the second prism 14 is formed into a triangular prism. In other embodiments, the second prism 14 is formed into a polygonal prism after the triangular prism is cut. As shown in FIG. 8, the reflecting surface 142 and the reflecting surface 143 are not directly connected, and the second prism 14 is cut at the connection of the reflecting surface 142 and the reflecting surface 143, which is beneficial to further reduce the occupied space of the second prism 14. In yet other embodiments, the second prism 14 is cut at the connection of the first incident surface 141 and the reflecting surface 142.

[0106] In addition, in the example provided in FIG. 7, the first incident surface 141, the reflection surface 142, the reflection surface 143 and the first exit surface 144 of the second prism 14 are all parallel to the second direction, which is consistent with the Z-axis. That is, the first incident surface 141, the reflection surface 142 and the reflection surface 143 are all perpendicular to the plane XOY, and thus the length dimension (Y-axis) and the width dimension (X-axis) of the mobile phone can be effectively utilized, and the thickness dimension (Z-axis) which is relatively cramped can be avoided.

[0107] In an example, the optical axis 130 of the second mirror group 13 and the optical axis 150 of the third mirror group 15 are arranged at an angle, which helps to reduce the length dimension of the lens 10 (i.e., the dimension in the Y-axis direction) and ensure that the second prism 14 has a larger size to provide more reflection surfaces.

[0108] Alternatively, it can be understood that if the optical axis 150 of the third mirror group 15 is parallel to the optical axis 130 of the second mirror group 13, the first incident surface 141 is perpendicular to the optical axis 130, and the first exit surface 144 is perpendicular to the optical axis 130, then the first incident surface 141 and the first exit surface 141 of the second prism 14 need to be parallel to each other, and the second prism 14 needs to be arranged between the second mirror group 13 and the third mirror group 15. Therefore, the distance between the second mirror group 13 and the third mirror group 15 needs to be large enough to leave sufficient space to install the second prism 14, which increases the length dimension of the lens 10. In addition, after the optical axis 150 of the third mirror group 15 is parallel to the optical axis 130 of the second mirror group 13, the structure of the second prism 14 is obviously restricted, which is not conducive to improving the flexibility of the second prism 14.

[0109] Therefore, in the example provided in the present application, after the optical axis 130 of the second mirror group 13 and the optical axis 150 of the third mirror group 15 are arranged at an angle, it helps to reduce the length dimension of the lens 10, and ensure that the second prism 14 has a larger size to provide more reflection surfaces, and the second prism 14 has better flexibility in structural arrangement.

[0110] In addition, in the example provided in the present application, the structure of the second prism 14 extends along the X-axis direction, which can reduce the space occupation of the second prism 14 in the Y-axis direction, which is also conducive to reducing the length dimension of the lens 10.

[0111] In a specific arrangement, the angle between the optical axis 130 of the second mirror group 13 and the optical axis 150 of the third mirror group 15 can be determined according to actual needs, which is not described herein.

[0112] As shown in FIG. 6 and FIG. 7, in an example provided by the present application, the lens 10 further comprises a third prism 16. The third prism 16 has at least three third surfaces for reflecting the light beam. The propagation path of the light beam in the third prism 16 can be effectively increased by the at least three third surfaces, which helps to reduce the distance between the third mirror group 15 and the photosensitive element 101, and effectively balances the large telephoto ratio and miniaturization of the lens 10. In addition, the third prism 16 can also perform a turning process on the light beam, which can improve the flexibility of the photosensitive element 101 in the layout.

[0113] Specifically, the third prism 16 comprises a second incident surface 161, a reflection surface 162, a reflection surface 163, a reflection surface 164 and a second exit surface 165. The second incident surface 161 faces the third mirror group 15, and the second incident surface 161 is perpendicular to the optical axis 150 of the third mirror group 15, so that the light beam transmitted from the third mirror group 15 can be effectively transmitted into the third prism 16 to prevent adverse problems such as chromatic aberration. The second exit surface 165 faces the photosensitive element 101, and the second exit surface 165 is parallel to the photosensitive surface of the photosensitive element 101, so that the light beam transmitted from the third prism 16 can be effectively transmitted to the photosensitive element 101 to prevent adverse problems such as chromatic aberration.

[0114] Wherein, the light beam enters the third prism 16 through the second incident surface 161, is reflected by the reflection surface 162, is reflected by the reflection surface 163, is reflected by the reflection surface 164, and is reflected by the exit surface 165. The second exit surface 165 and the reflection surface 162 are the same surface of the third prism 16, so in order to make this surface realize the functions of reflection and transmission at the same time, it is necessary to make this surface satisfy the total reflection condition.

[0115] For example, the included angle θ3 between the second incident surface 161 and the second exit surface 165 (reflection surface 162) satisfies: 40°≤θ3≤60°.

[0116] In addition, the second incident surface 161 and the reflection surface 164 are the same surface of the third prism 16, so in order to make this surface realize the functions of reflection and transmission at the same time, it is necessary to make this surface satisfy the total reflection condition.

[0117] For example, in an example provided by the present application, the cross section of the third prism 16 is an isosceles triangle, wherein the second incident surface 161 (reflection surface 164) and the second exit surface 165 (reflection surface 162) are two sides of the triangle, and the reflection surface 163 is the base of the triangle. The light beam reflected by the reflection surface 163 to the reflection surface 164 can produce total reflection.

[0118] In addition, in actual application, the turning ability of the third prism 16 to the light beam is also related to the refractive index of the third prism 16. In an example, the refractive index N2 of the third prism 16 can satisfy,

[0119] That is, in order to make the reflection surface 162 and the reflection surface 164 total reflection surfaces, the angle θ3 and the refractive index of the third prism 16 can be reasonably set.

[0120] In addition, in order to ensure that the reflection surface 163 can effectively reflect the light beam, in specific application, a reflection film can be configured on the reflection surface 163. The reflection film can be configured according to the types commonly used at present, which is not limited in the application.

[0121] In addition, as shown in FIG. 7 and FIG. 9, in specific setting, θ1 and θ3 can be equal or not equal.

[0122] When θ1 and θ3 are equal, the length of the lens 10 can be effectively reduced.

[0123] Specifically, as shown in FIG. 7, in specific setting, in order to ensure the quality of the light beam and prevent color difference and other problems, the first exit surface 144 and the second entrance surface 161 can be parallel to each other and perpendicular to the optical axis 150 of the third lens group 15. When θ1 and θ3 are equal, the first entrance surface 141 and the second exit surface 165 are parallel to each other and perpendicular to the Y axis. The Y axis direction is the length direction of the lens 10, so the length of the lens 10 can be effectively reduced.

[0124] It should be noted that in the example provided in FIG. 7, three reflection surfaces are included in the third prism 16 as an example for illustrative explanation. In other examples, four or more reflection surfaces can be configured in the third prism 16. Alternatively, it can be understood that the light beam can be reflected at least three times in the third prism 16 to increase the propagation path of the light beam in the third prism 16.

[0125] In addition, in the example provided in FIG. 7, the second entrance surface 161, the reflection surface 162, the reflection surface 163, the reflection surface 164 and the second exit surface 165 of the third prism 16 are parallel to the second direction, which is consistent with the Z axis. That is, the second entrance surface 161, the reflection surface 162, the reflection surface 163, the reflection surface 164 and the second exit surface 165 are perpendicular to the plane XOY, so the length (Y axis) and the width (X axis) of the mobile phone can be effectively utilized, and the thickness (Z axis) which is relatively cramped can be avoided.

[0126] In an example, the optical axis 150 of the third mirror group 15 and the light receiving surface of the light receiving element 101 are arranged at an angle, i.e., less than 90°, which helps to reduce the length of the lens 10 and ensure that the third prism 16 has a larger size to provide more reflection surfaces.

[0127] Alternatively, it can be understood that if the light receiving surface of the light receiving element 101 is perpendicular to the optical axis 150 of the third mirror group 15, the second incident surface and the second exit surface of the third prism 16 need to be parallel to each other, and the third prism 16 needs to be arranged between the third mirror group 15 and the light receiving element 101. Therefore, the distance between the third mirror group 15 and the light receiving element 101 needs to be large enough to provide sufficient space for installing the third prism 16, which increases the length of the lens 10. In addition, after the light receiving surface of the light receiving element 101 is perpendicular to the optical axis 150 of the third mirror group 15, the structure of the third prism 16 is obviously restricted, which is not conducive to improving the flexibility of the third prism 16.

[0128] Therefore, in the example provided in the present application, the optical axis 150 of the third mirror group 15 and the light receiving surface of the light receiving element 101 are arranged at an angle, which helps to reduce the length of the lens 10 and ensure that the third prism 16 has a larger size to provide more reflection surfaces, and the third prism 16 has better flexibility in structural arrangement.

[0129] In addition, in the example provided in the present application, the structure of the third prism 16 extends along the X-axis direction, which can reduce the space occupation of the third prism 16 in the Y-axis direction, which is also conducive to reducing the length of the lens 10.

[0130] In a specific arrangement, the angle between the optical axis 150 of the third mirror group 15 and the light receiving surface of the light receiving element 101 can be determined according to actual needs, which is not described here.

[0131] Alternatively, it can be understood that in the example provided in the present application, the reflection surface 122 of the first prism 12 is parallel to the first direction (X-axis), and the reflection surface of the second prism 14 and the reflection surface of the third prism 16 are parallel to the second direction (Z-axis). Therefore, the X-axis, Y-axis and Z-axis directions in space can be effectively utilized.

[0132] In addition, in some examples, more prisms can be provided in the lens 10.

[0133] For example, as shown in FIGS. 10 and 11, in another example provided in the present application, the lens 10 further includes a fourth prism 17, which is located on the image side of the third prism 16. The fourth prism 17 is used to fold the light beam transmitted from the third prism 16 and transmit it to the light receiving surface of the light receiving element 101.

[0134] The type of the fourth prism 17 can be various in specific settings.

[0135] For example, as shown in FIG. 10 and FIG. 11, in an example provided by the present application, the fourth prism 17 is specifically a Schmidt prism. By configuring the fourth prism 17, the height dimension of the tail (image side) of the camera module 100 can be reduced. The height dimension is consistent with the Z axis.

[0136] Specifically, the fourth prism 17 includes an incident surface 171, a reflection surface 172, a reflection surface 173, and an exit surface 174. The incident surface 171 is towards the second exit surface 165 of the third prism 16, and the second exit surface 165 is parallel to the incident surface 171, so that the light beam transmitted from the third prism 16 can be effectively transmitted into the fourth prism 17, preventing adverse problems such as chromatic aberration. The exit surface 174 is towards the photosensitive element 101, and the exit surface 174 is parallel to the photosensitive surface of the photosensitive element 101, so that the light beam transmitted from the fourth prism 17 can be effectively transmitted to the photosensitive element 101, preventing adverse problems such as chromatic aberration.

[0137] The light beam enters the fourth prism 17 through the incident surface 171, is reflected by the reflection surface 172, is reflected by the reflection surface 173, and is reflected by the exit surface 174. The exit surface 174 and the reflection surface 172 are the same surface of the fourth prism 17, so that the surface can realize the functions of reflection and transmission at the same time, and the surface needs to satisfy the total reflection condition.

[0138] For example, the included angle θ4 between the incident surface 171 and the exit surface 174 (reflection surface 172) satisfies: 45° < θ4. It should be noted that the smaller the angle θ4, the smaller the size of the fourth prism 17 in the Z axis direction. The larger the angle θ4, the larger the size of the fourth prism 17 in the Z axis direction. Therefore, when the fourth prism 17 is set, the specific value of the included angle θ4 can be reasonably set according to the actual space requirement, which is not described here.

[0139] In addition, in actual application, the turning ability of the fourth prism 17 to the light beam is also related to the refractive index of the fourth prism 17. In an example, the refractive index N1 of the fourth prism 17 can satisfy:

[0140] That is, in order to make the reflection surface 172 a total reflection surface, the angle θ4 and the refractive index of the fourth prism 17 can be reasonably set.

[0141] In addition, in order to ensure that the reflecting surface 173 can effectively reflect the light beam, in a specific application, a reflecting film can be arranged on the reflecting surface 173. The reflecting film can be arranged according to a type commonly used at present, and the present application does not make any limitation in this regard.

[0142] It should be noted that, in the examples provided in the figures, the fourth prism 17 is exemplarily described by taking an example in which two reflecting surfaces are included in the fourth prism 17. In other examples, three or more reflecting surfaces can also be arranged in the fourth prism 17. Alternatively, it can be understood that the light beam can be reflected at least twice in the fourth prism 17, so as to increase the propagation path of the light beam in the fourth prism 17.

[0143] In addition, in the examples provided in FIGS. 10 and 11, the incident surface 171, the reflecting surface 172, the reflecting surface 173, and the exit surface 174 of the fourth prism 17 are all parallel to the first direction, which is consistent with the X-axis. That is, the incident surface 171, the reflecting surface 172, the reflecting surface 173, and the exit surface 174 are all perpendicular to the plane ZOY, and thus the thickness dimension (Z-axis) of the mobile phone can be effectively utilized.

[0144] Please refer to FIGS. 6 and 10. In FIG. 10, by arranging the fourth prism 17, the propagation direction of the light beam can be deflected, so that the light beam can be transmitted in the Z-axis direction after being folded, and thus the light sensing surface of the light sensing element 101 can be inclined to the Z-axis direction.

[0145] Alternatively, it can be understood that, in FIG. 6, the light sensing surface of the light sensing element 101 is parallel to the Z-axis direction, and thus the space in the Z-axis direction will restrict the area of the light sensing surface, which is not conducive to arranging a light sensing surface with a large area in the cramped Z-axis direction.

[0146] In the example provided in FIG. 10, the light sensing surface of the light sensing element 101 is inclined to the Z-axis direction, and thus it is helpful to increase the area of the light sensing surface by reasonably utilizing the relatively large X-axis and Y-axis spaces, while reducing the space occupied by the light sensing element 101 in the Z-axis direction, which is conducive to reducing the tail height of the camera module 100 and improving the light sensing performance of the camera module 100.

[0147] The modulation transfer function (MTF) is one of the evaluation quantities of the imaging quality of an optical system. The larger the MTF is, the better the imaging quality of the optical system is.

[0148] Therefore, the present application also provides an MTF curve of the lens 10 shown in FIG. 10.

[0149] In FIGS. 12 and 13, the abscissa represents the defocus amount, and the unit is mm, and the ordinate represents the modulation transfer function.

[0150] In FIG. 12, a schematic diagram of the MTF defocus curve of the lens at infinity and the central field of view at 125 lp / mm is shown, and different curves in FIG. 12 respectively represent the relationship between the modulation contrast and the defocus amount at different image height positions.

[0151] In FIG. 13, a schematic diagram of the MTF defocus curve of the lens at 1 m and the central field of view at 125 lp / mm is shown, and different curves in FIG. 13 respectively represent the relationship between the modulation contrast and the defocus amount at different image height positions.

[0152] As can be clearly seen from FIG. 12 and FIG. 13, the lens 10 provided in the embodiments has good imaging effect at both near focus and far focus.

[0153] Alternatively, as shown in FIG. 14 and FIG. 15, in another example provided in the present application, the fourth prism 17 is a right-angle prism. By configuring the right-angle prism, the length of the lens 10 can be effectively reduced. It should be noted that in FIG. 14 and FIG. 15, the fourth prism 17 is arranged in the opposite direction along the Z-axis, so that the photosensitive element 101 has good flexibility in position layout.

[0154] Specifically, the fourth prism 17 includes an incident surface 175, a reflection surface 176 and an exit surface 177. The incident surface 175 is directed towards the second exit surface 165 of the third prism 16, and the second exit surface 165 is parallel to the incident surface 175, so that the light beam transmitted from the third prism 16 can be effectively transmitted into the fourth prism 17, preventing adverse problems such as chromatic aberration. The exit surface 177 is directed towards the photosensitive surface of the photosensitive element 101, and the exit surface 177 is parallel to the photosensitive surface of the photosensitive element 101, so that the light beam transmitted from the fourth prism 17 can be effectively transmitted into the photosensitive element 101, preventing adverse problems such as chromatic aberration.

[0155] The angle between the incident surface 175 and the exit surface 177 is 90°. In addition, in order to achieve total reflection of the reflection surface 176 and the light beam can be perpendicular to the exit surface 177, the angle between the reflection surface 176 and the incident surface 175 and the exit surface 177 is 45°.

[0156] In FIG. 14 and FIG. 15, by configuring the fourth prism 17, the propagation direction of the light beam can be deflected, so that the light beam can be transmitted along the Z-axis direction, and thus the size of the lens 10 in the Y-axis direction can be reduced.

[0157] In addition, the photosensitive surface of the photosensitive element can be perpendicular to the Z-axis direction, so that the space in the Z-axis direction does not restrict the area of the photosensitive surface, which is beneficial to configuring a larger area of the photosensitive surface in the cramped Z-axis direction and improving the photosensitive performance of the camera module.

[0158] It should be noted that in the above examples, the fourth prism 17 is a Schmidt prism and a right-angle prism as an example of illustrative description, in actual application, the fourth prism 17 can also be other types of prisms. Or, other prisms can also be configured on the image side of the fourth prism 17. Here is not described.

[0159] In addition, the parallel and vertical in the above refer to approximately parallel or approximately vertical, that is, size deviation is allowed. Correspondingly, the above description of angle or refractive index and other parameters is also an approximate value, and size deviation can exist in specific application.

[0160] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be referred to each other if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0161] In the present application, "a plurality of" refers to two or more. The "and / or" describes the relationship between 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, where A and B can be singular or plural.

[0162] It can be understood that various numbers involved in the embodiments of the present application are only distinguished for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic.

Claims

1. A lens characterized by comprising: The first mirror group, the first prism, the second mirror group, the second prism, the third mirror group and the third prism are arranged in sequence from the object side to the image side; The first mirror group has positive optical power, the second mirror group has negative optical power, and the third mirror group has negative optical power; The first prism has a first surface for reflecting a light beam passing through the first mirror group to the second mirror group; The second prism has at least two second surfaces for reflecting a light beam passing through the second mirror group to the third mirror group; The third prism has at least three third surfaces; The first surface is parallel to a first direction, the second surface and the third surface are parallel to a second direction, and the first direction and the second direction are perpendicular to each other.

2. The lens according to claim 1, characterized in that, An optical axis of the second mirror group is parallel to a third direction; The third direction is perpendicular to the first direction and the second direction.

3. The lens according to claim 1 or 2, characterized in that, An optical axis of the third mirror group forms an angle with the optical axis of the second mirror group.

4. The lens according to claim 3, characterized in that, An optical axis of the first mirror group is perpendicular to the optical axis of the second mirror group and the optical axis of the third mirror group.

5. The lens barrel according to any one of claims 1 to 4, characterized in that, The second prism includes a first incident surface and a first exit surface, the first incident surface faces the second mirror group, and the first exit surface faces the third mirror group; The at least two second surfaces of the second prism include a first reflection surface and a second reflection surface, a light beam passing through the first incident surface transmits through the first reflection surface and the second reflection surface and then transmits from the first exit surface; The first reflection surface and the first exit surface are the same surface of the second prism.

6. The lens of claim 5, wherein, An included angle θ1 between the first incident surface and the first exit surface satisfies 40°≤θ1≤60°.

7. The lens of claim 6, wherein, The refractive index N1 of the second prism satisfies, 8. The lens according to any one of claims 5 to 7, characterized in that, An included angle between the second reflection surface and the first exit surface is θ2, and θ1=2*θ2.

9. The lens according to any one of claims 5 to 8, characterized in that, The first incident surface is perpendicular to the optical axis of the second mirror group.

10. The lens according to any one of claims 5 to 9, characterized in that, The first exit surface is perpendicular to the optical axis of the third mirror group.

11. The lens barrel according to any one of claims 1 to 10, characterized in that, The third prism includes a second incident surface and a second exit surface, and the second incident surface faces the third mirror group; The at least three third surfaces of the third prism include a third reflection surface, a fourth reflection surface and a fifth reflection surface, a light beam passing through the second incident surface transmits through the third reflection surface, the fifth reflection surface and the fourth reflection surface and then transmits from the second exit surface; The third reflection surface and the second exit surface are the same surface of the third prism.

12. The lens according to claim 11, characterized in that, An included angle θ3 between the second incident surface and the second exit surface satisfies 40°≤θ3≤60°.

13. The lens of claim 12, wherein, The refractive index N2 of the third prism satisfies, 14. The lens barrel according to any one of claims 5 to 13, characterized by The third prism includes a second incident surface and a second exit surface, an included angle between the second incident surface and the second exit surface is θ3, and an included angle between the first incident surface and the first exit surface is θ1; θ1 and θ3 are equal.

15. The lens according to any one of claims 11 to 14, characterized in that The fourth reflection surface and the second incident surface are the same surface of the third prism.

16. The lens of claim 15, wherein, An included angle between the fifth reflection surface and the second incident surface is equal to an included angle between the fifth reflection surface and the second exit surface.

17. The lens according to any one of claims 11 to 16, characterized in that, The second incident surface is perpendicular to the optical axis of the third mirror group.

18. The lens barrel according to any one of claims 1 to 17, characterized in that, The first prism is a right-angle prism.

19. The lens barrel according to any one of claims 1 to 18, characterized by The lens further comprises a fourth prism, which is located on the image side of the third prism. The fourth prism is a right-angle prism or a Schmidt prism.

20. The lens barrel according to any one of claims 1 to 19, characterized by, The second lens group is movable along its optical axis.

21. An image capture module, comprising: A camera module comprising a light-receiving element and the lens according to any one of claims 1 to 20, the light-receiving element being disposed on the image side of the lens.

22. An electronic device, comprising: A camera module comprising a housing and the camera module according to claim 21, the camera module being disposed in the housing.

Images