Optical lens group, lens module and electronic equipment

Abstract

The embodiment of the invention discloses an optical lens group, a lens module and electronic equipment, a front optical part is arranged on the front side of a rear prism, and light is guided to a light incident surface through the front optical part. Furthermore, the light can be refracted in sequence on the light emitting surface and the first reflecting surface in the rear prism, so that the folding of the first light path is realized, and the overall size of the optical lens group is reduced. On the other hand, the first reflecting surface is configured to be bent towards the light incident surface, so that the irradiation area is increased. The irradiation area of the light-emitting surface can be increased. And especially under the condition of weak ambient light, the definition of the image quality is effectively improved. In addition, the area of the light-sensitive surface is effectively increased. And meanwhile, by improving the propagation direction of a tail end light path, on the premise that the size is not increased, the use of a photosensitive element with a larger size is supported, and the image quality is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of optical technology, and more particularly to an optical lens assembly, a lens module, and an electronic device. Background Technology

[0002] With the continuous upgrading of electronic devices, consumers have increasingly higher demands for the camera functions of these devices. However, the improved performance of optical modules also leads to more complex internal structures and larger space requirements. Therefore, how to improve the performance of optical modules while reducing their space occupation has become a problem that needs to be solved. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide an optical lens assembly, a lens module, and an electronic device. By utilizing a first reflective surface that is curved toward the light-emitting surface, the illumination area is increased, thereby improving image quality. Simultaneously, the overall volume of the optical lens assembly can be reduced by utilizing multiple refractions in the rear prism.

[0004] According to a first aspect of the present invention, an optical lens assembly is provided, the optical lens assembly comprising: Front optical unit; and The rear prism has a light-emitting surface, a light-incident surface, and a first reflecting surface; The rear prism is configured such that light enters the rear prism from the light-incident surface and forms a first light path within the rear prism. In the first light path, the light is reflected by the light-exiting surface to the first reflecting surface, the first reflecting surface reflects the light back to the light-exiting surface, and the light exits from the light-exiting surface. The first reflecting surface is bent towards the light-exiting surface to increase the illumination area.

[0005] Furthermore, one side of the first reflective surface is disposed adjacent to the light-emitting surface, while the other side gradually moves away from the light-emitting surface.

[0006] Furthermore, one side of the light-incident surface is adjacent to the light-exiting surface, and the other side gradually moves away from the light-exiting surface and extends towards the first reflecting surface. The light-incident surface is curved towards the light-exiting surface to correct aberrations.

[0007] Furthermore, both the incident light surface and the exit light surface are bent toward opposite sides to correct aberrations.

[0008] Furthermore, the rear prism also has a second reflective surface, which is spaced apart from the first reflective surface; The light rays form a second light path within the rear prism. In the direction of light ray propagation, the second light path is located before the first light path. In the second light path, the second reflective surface reflects the light rays to the light-emitting surface or at least a portion of the light-emitting surface and at least a portion of the light-incident surface.

[0009] Furthermore, the rear prism has a first plane, the first plane having the light-incident surface and the light-exit surface, the light-incident surface being disposed corresponding to the second reflective surface, and the light-exit surface being disposed corresponding to the first reflective surface; In the second optical path, the second reflective surface reflects the light to the first plane, and in the first optical path, the first reflective surface receives the reflected light from the first plane.

[0010] Furthermore, the side of the second reflective surface away from the first reflective surface is adjacent to the light-incident surface, the side of the second reflective surface close to the first reflective surface gradually moves away from the light-incident surface, and the second reflective surface bends towards the light-incident surface.

[0011] Furthermore, the first reflective surface and the second reflective surface are arranged in a mirror-symmetric manner.

[0012] Furthermore, the rear prism has a groove located between the first reflective surface and the second reflective surface and facing away from the first plane. The groove is offset from the first optical path and the second optical path.

[0013] Furthermore, the rear prism is made of high-refractive-index, low-dispersion glass, and the first reflective surface is provided with a reflective layer.

[0014] Secondly, embodiments of the present invention also provide a lens module, the lens module comprising: The imaging unit has a photosensitive surface; and According to the optical lens assembly described in the first aspect above, the first reflecting surface reflects the light through the light-emitting surface to the photosensitive surface.

[0015] Thirdly, embodiments of the present invention also provide an electronic device, the electronic device comprising: According to the lens module described in the second aspect above.

[0016] The optical lens assembly, lens module, and electronic device of this invention have a front optical section disposed in front of the rear prism to guide light to the incident light surface. Furthermore, the light can be refracted sequentially at the light-emitting surface and the first reflecting surface in the rear prism, achieving folding of the first optical path and reducing the overall size of the optical lens assembly. On the other hand, the first reflecting surface is configured to bend towards the incident light surface to increase the illumination area. This improves the illumination area of ​​the light-emitting surface, effectively enhancing image clarity, especially in low ambient light conditions. In addition, the area of ​​the photosensitive surface is effectively increased. Simultaneously, by improving the propagation direction of the end optical path, a larger photosensitive element can be used without increasing the overall size, significantly improving image quality. Attached Figure Description

[0017] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which: Figure 1 This is a schematic diagram of the lens module provided in the first embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the rear prism and imaging unit provided in the second embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the rear prism and imaging unit provided in the third embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the rear prism and imaging unit provided in the fourth embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the rear prism and imaging unit provided in the fifth embodiment of the present invention; Figure 6 This is a schematic diagram of the lens module provided in the sixth embodiment of the present invention; Figure 7 This is a schematic diagram of the rear prism and imaging unit provided in the seventh embodiment of the present invention; Figure 8 This is a schematic diagram of the rear prism and imaging unit provided in the eighth embodiment of the present invention; Figure 9 This is a schematic diagram of the rear prism and imaging unit provided in the ninth embodiment of the present invention; Figure 10 This is a schematic diagram of the rear prism and imaging unit provided in the eleventh embodiment of the present invention; Figure 11 This is a simulation diagram of the modulation transfer function of the rear prism provided in the second embodiment of the present invention; Figure 12 This is a simulation diagram of the modulation transfer function of the rear prism provided in the third embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1- Rear prism; 11-Incident surface; 111-First region; 112-Second region; 12-Outceasing surface; 131-First reflecting surface; 132-Second reflecting surface; 14-First plane; 15-Groove; 2-Front-end optical unit; 3-Light; 31 - First optical path; 32 - Second optical path; 4-Imaging section; 41-Photosensitive surface; 5-Transmission line; 6-Connector. Detailed Implementation

[0019] The present invention is described below based on embodiments, but the invention is not limited to these embodiments. In the detailed description of the invention below, certain specific details are described in detail. Those skilled in the art will fully understand the invention even without these details. To avoid obscuring the essence of the invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0020] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0021] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0022] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Figure 1 This is a schematic diagram of the lens module provided in the first embodiment.

[0025] In some implementations, such as Figure 1 As shown, the lens module includes a housing, a rear prism 1, a front optics unit 2, an imaging unit 4, a transmission line 5, and a connector 6. Light 3 passes sequentially through the front optics unit 2 and the rear prism 1 to the imaging unit 4.

[0026] Figure 2 This is a schematic diagram of the structure of the rear prism 1 and the imaging unit 4 provided in the second embodiment. Figure 3 This is a schematic diagram of the structure of the rear prism 1 and the imaging unit 4 provided in the third embodiment. Figure 4This is a schematic diagram of the structure of the rear prism 1 and the imaging unit 4 provided in the fourth embodiment. Figure 5 This is a schematic diagram of the structure of the rear prism 1 and the imaging unit 4 provided in the fifth embodiment.

[0027] Further reference Figures 1-5 As shown, the rear prism 1 in the figure is a triangular prism, that is, it has three optical surfaces. Among them, the surface of the rear prism 1 in the first embodiment, the third embodiment, the fourth embodiment, and the fifth embodiment has at least one concave surface.

[0028] Figure 6 This is a schematic diagram of the lens module provided in the sixth embodiment.

[0029] In some implementations, such as Figure 6 As shown, the lens module includes a housing, a rear prism 1, a front optics unit 2, an imaging unit 4, a transmission line 5, and a connector 6. Light 3 passes sequentially through the front optics unit 2 and the rear prism 1 to the imaging unit 4.

[0030] Figure 7 This is a schematic diagram of the rear prism 1 and imaging unit 4 provided in the seventh embodiment. Figure 8 This is a schematic diagram of the rear prism 1 and imaging unit 4 provided in the eighth embodiment. Figure 9 This is a schematic diagram of the rear prism 1 and imaging unit 4 provided in the ninth embodiment. Figure 10 This is a schematic diagram of the rear prism 1 and imaging unit 4 provided in the eleventh embodiment.

[0031] Further reference Figures 6-11 As shown, the rear prism 1 in the figure is a quadrangular prism, that is, it has four optical surfaces. Among them, the surfaces of the sixth embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, and the eleventh embodiment have at least one concave surface.

[0032] In some implementations, such as Figure 1 , Figures 3-6 and Figures 8-11 As shown, the rear prism 1 has a light-emitting surface 12, a light-incident surface 11, and a first reflecting surface 131. In the direction of light ray 3 propagation, the rear prism 1 is located behind the front optical section 2.

[0033] The rear prism 1 is configured such that light 3 enters the rear prism 1 from the light-incident surface 11 and forms a first light path 31 within the rear prism 1. In the first light path 31, light 3 is reflected by the light-exiting surface 12 to the first reflecting surface 131, and the first reflecting surface 131 reflects light 3 again to the light-exiting surface 12 and exits from the light-exiting surface 12. In this embodiment, the first reflecting surface 131 is bent towards the light-exiting surface 12 to increase the illumination area. That is, the first reflecting surface 131 is configured as a concave surface recessed towards the center of the rear prism 1.

[0034] Optionally, the first reflecting surface 131 can be configured as a spherical, aspherical, or freeform surface. In this embodiment, the first reflecting surface 131 has negative refractive power. When light 3 is reflected by the first reflecting surface 131, the first reflecting surface 131 can diverge the reflected light 3, resulting in a larger illumination area and thus improving imaging performance. This is especially beneficial in low-light environments, improving image quality. Furthermore, the light 3 in the first optical path 31 is refracted at both the light-emitting surface 12 and the first reflecting surface 131, and exits from the rear prism 1 after passing through the light-emitting surface 12 for the second time. The multiple folds of the light 3 in the rear prism 1 reduce the overall size of the optical lens assembly and optimize the propagation path.

[0035] In other embodiments, the optical surfaces of the rear prism 1 in the second and seventh embodiments are both planar, that is, the first reflecting surface 131 is also planar. In this form, the width of the light ray 3 reflected from the first reflecting surface 131 to the light emitting surface 12 is a distance L1 (e.g., ...). Figure 2 (as shown) or distance L3 (as shown) Figure 7 (As shown). In contrast, in the third embodiment, the width of the light ray 3 reflected from the first reflecting surface 131 to the light emitting surface 12 is a distance L2 (as shown). Figure 3 As shown), this distance L2 is greater than the distance L1. In the seventh embodiment, the width of the light ray 3 reflected from the first reflecting surface 131 to the light emitting surface 12 is the distance L4 (as shown). Figure 7 As shown in the figure, the distance L4 is greater than the distance L3.

[0036] In summary, the optical lens assembly in this embodiment has a front optical section 2 positioned in front of the rear prism 1 to guide light 3 to the incident light surface 11. Furthermore, the light 3 can be refracted sequentially at the exiting light surface 12 and the first reflecting surface 131 in the rear prism 1, achieving a folding of the first optical path 31 and reducing the overall size of the optical lens assembly. On the other hand, the first reflecting surface 131 is configured to bend towards the incident light surface 11 to increase the illumination area. This improves the illumination area of ​​the exiting light surface 12. Especially in low ambient light conditions, this effectively improves image clarity. Simultaneously, by improving the propagation direction of the end optical path, a larger photosensitive element can be used without increasing the overall size, significantly improving image quality.

[0037] In some implementations, such as Figure 1 , Figures 3-6 and Figures 8-11As shown, one side of the first reflective surface 131 is adjacent to the light-emitting surface 12, and the other side gradually moves away from the light-emitting surface 12. Optionally, the light-incident surface 11 is planar, with one side connected to the light-emitting surface 12 and the other side connected to the side of the first reflective surface 131 away from the light-emitting surface 12. This allows the rear first optical path 31 to be folded in a smaller space, and makes the rear prism 1 smaller in size.

[0038] In some implementations, such as Figures 4-5 As shown, one side of the light-incident surface 11 is adjacent to the light-exiting surface 12, and the other side gradually moves away from the light-exiting surface 12 and extends towards the first reflecting surface 131. The light-incident surface 11 is curved toward the light-exiting surface 12 to correct aberrations. Optionally, the light-exiting surface 12 is planar.

[0039] Figure 3 and Figure 9 The second optical path 32 is shown with a thin dashed line, and the first optical path 31 is shown with a thick dashed line.

[0040] Specifically, such as Figure 3 As shown, in the propagation direction of light 3, the second optical path 32 is located in front of the first optical path 31. The rear prism 1 is a triangular prism. This triangular prism has three optical surfaces, namely, the light-incident surface 11, the light-exit surface 12, and the first reflecting surface 131. The light-incident surface 11 includes multiple regions, such as... Figure 4 As shown, the multiple regions include a first region 111 and a second region 112. The first region 111 is located near the light-emitting surface 12, and the second optical path 32 is located near the first reflecting surface 131. When the light-emitting surface 12 first refracts the light ray 3, and then allows the light ray 3 to pass through the light-emitting surface 12 for illumination, the consistency of the propagation path length of the light ray 3 in the first region 111 and the second region 112 can be improved. For example, the second optical path 32 of the light ray 3 incident from the first region 111 is shorter, while the first optical path 31 is longer. The first optical path 31 of the light ray 3 incident from the second region 112 is shorter, while the second optical path 32 is longer. That is, in this embodiment, the angles of the light-incident surface 11, the light-emitting surface 12, and the first reflecting surface 131 are configured so that the optical path lengths of the light rays 3 incident from multiple regions can be kept as consistent as possible, avoiding astigmatism in the optical lens assembly. Furthermore, the incident light surface 11 bends toward the center of the rear prism 1, which can further correct spherical aberration.

[0041] In some implementations, such as Figure 5As shown, both the incident surface 11 and the emitting surface 12 are curved toward opposite sides to correct aberrations. In this embodiment, the emitting surface 12 can cooperate with the first reflecting surface 131 to further increase the illumination area of ​​the emitting surface 12. The incident surface 11 and the emitting surface 12 can be equivalent to a concave lens, so that the emitting surface 12 can further correct spherical aberration.

[0042] In some implementations, such as Figures 8-10 As shown, the rear prism 1 also has a second reflecting surface 132, which is spaced apart from the first reflecting surface 131. The light ray 3 forms a second optical path 32 within the rear prism 1. In the propagation direction of the light ray 3, the second optical path 32 is located before the first optical path 31.

[0043] In the second optical path 32, such as Figure 9 As shown, light ray 3 propagates from the incident surface 11 to the second reflecting surface 132, and is then reflected by the second reflecting surface 132 to the exiting surface 12. Alternatively, the second reflecting surface 132 reflects light ray 3 to at least a portion of the exiting surface 12 and at least a portion of the incident surface 11. In the first optical path 31, the exiting surface 12, the incident surface 11, and the first reflecting surface 131 reflect light ray 3 to form the first optical path 31. In this embodiment, the second reflecting surface 132 increases the number of reflections of light ray 3 within the rear prism 1, which helps the rear prism 1 to further correct the aberrations of light ray 3.

[0044] In some implementations, such as Figures 8-10 As shown, the rear prism 1 has a first plane 14. The first plane 14 has an incident light surface 11 and an exit light surface 12, which are spaced apart. The incident light surface 11 is correspondingly arranged with the second reflecting surface 132, and the exit light surface 12 is correspondingly arranged with the first reflecting surface 131. Optionally, the second reflecting surface 132 is a plane.

[0045] Specifically, such as Figure 9As shown, the light-incident surface 11 in this embodiment includes multiple regions. These regions include a first region 111 and a second region 112. The first region 111 is located away from the light-exiting surface 12, and the second optical path 32 is located close to the light-exiting surface 12. Light rays 3 undergo total internal reflection sequentially through the second reflecting surface 132, the first plane 14, and the first reflecting surface 131 in the rear prism 1. Specifically, light rays 3 entering from the first region 111 are reflected at the light-incident surface 11, light rays 3 entering from the second region 112 are reflected at the light-exiting surface 12, and some light rays 3 entering from the region between the first region 111 and the second region 112 are reflected in the region of the first plane 14 located between the light-incident surface 11 and the light-exiting surface 12. This ensures that the propagation path lengths of light rays 3 in the first region 111 and the second region 112 remain consistent. For example, light rays 3 incident from the first region 111 have a shorter second optical path 32 and a longer first optical path 31. The light ray 3 incident from the second region 112 has a shorter first optical path 31 and a longer second optical path 32. That is, in this embodiment, the angles of the incident surface 11, the emitting surface 12, the first reflecting surface 131, and the second reflecting surface 132 are configured so that the optical path lengths of the light rays 3 incident from multiple regions remain consistent, avoiding astigmatism in the optical lens assembly. Furthermore, the refraction of the light ray 3 by the first reflecting surface 131 and the second reflecting surface 132 allows the incident surface 11 and the emitting surface 12 to be on the same plane.

[0046] In some implementations, such as Figure 9 As shown, the side of the second reflective surface 132 away from the first reflective surface 131 is adjacent to the light-incident surface 11. The side of the second reflective surface 132 closest to the first reflective surface 131 gradually moves away from the light-incident surface 11, and the second reflective surface 132 is bent towards the light-incident surface 11. In this embodiment, the first reflective surface 131 and the second reflective surface 132 are bent towards opposite sides, which can further increase the area of ​​the illumination region of the light-emitting surface 12.

[0047] Furthermore, the first reflecting surface 131 and the second reflecting surface 132 are arranged in a mirror-symmetrical manner. This helps those skilled in the art to design the optical path in the rear prism 1 and optimize the manufacturing process of the rear prism 1.

[0048] In some implementations, such as Figure 10 As shown, the rear prism 1 has a groove 15. The groove 15 is located between the first reflecting surface 131 and the second reflecting surface 132 and faces the side away from the first plane 14. The groove 15 is offset from the first optical path 31 and the second optical path 32.

[0049] Optionally, the inner wall surface of the groove 15 is a conical surface or a V-shaped surface. The bottom of the conical surface faces the center of the first plane 14. The V-shaped surface extends parallel to the first plane 14 and penetrates the rear prism 1. This reduces the weight of the rear prism 1 and decreases the ineffective area of ​​the rear prism 1.

[0050] Optionally, such as Figures 1-10 As shown, the rear prism 1 is made of high-refractive-index, low-dispersion glass, and reflective layers are evenly distributed on the first reflective surface 131 and the second reflective surface 132. The reflective layers can be mercury or metallic aluminum, etc. Taking metallic aluminum as an example, the metallic aluminum layer is formed on the first reflective surface 131 and the second reflective surface 132 by vacuum evaporation coating.

[0051] Optionally, such as Figures 1-10 As shown, when the light-incident surface 11, the light-exit surface 12, or the first plane 14 reflects the light ray 3, the light ray 3 satisfies the incident condition of total internal reflection. That is, the incident angle of the light ray 3 is greater than or equal to a predetermined value. In this embodiment, the rear prism 1 can be made of K9 glass (optical borosilicate glass), which has the characteristics of high light transmittance, low dispersion, and high refractive index. Its refractive index is 1.516, and its incident angle should be greater than or equal to 41.2° to achieve total internal reflection. In this form, the medium around the rear prism 1 is air. The table below shows the critical angles in air when the rear prism 1 is made of different materials. Those skilled in the art can adjust the structure of the rear prism 1 according to the material of the rear prism 1.

[0052] Optionally, the aforementioned rear prism 1 can also be a polyhedral structure such as a pentaprism. The number of its curved surfaces can also be increased to three or more, enabling it to simultaneously perform multiple functions such as optical path deflection, focusing, or aberration correction.

[0053] Optionally, by employing ultra-precision single-point diamond turning and plasma-assisted polishing, the surface accuracy of the rear prism 1 can be improved, achieving a surface accuracy of ±5nm for the optical surface.

[0054] Optionally, by utilizing a design framework based on physical inverse generation and AI joint optimization, reinforcement learning can be used to quickly converge to a mass-producible high-performance curved surface configuration, thereby optimizing the design process of the optical surface of the rear prism 1.

[0055] In an alternative implementation, the optical lens group in the above embodiments can be applied to a lens module. For example... Figure 1 and Figure 6 As shown, the lens module also includes an imaging unit 4. The imaging unit 4 has a photosensitive surface 41. The first reflecting surface 131 reflects the light ray 3 through the light-emitting surface 12 and onto the photosensitive surface 41.

[0056] Optionally, in this embodiment, the imaging unit 4 is a photosensitive chip. The photosensitive chip can be a CMOS chip. The photosensitive surface 41 of the photosensitive chip faces the light-emitting surface 12 of the rear prism 1. Figure 1 As shown, the photosensitive chip is tilted to ensure that the photosensitive surface 41 is parallel to the light-emitting surface 12. Figure 6 As shown, the front optical unit 2 and the photosensitive chip are on the same side of the first plane 14. The distance between the light-emitting surface 12 and the photosensitive surface 41 can be 0.5 mm, so that the light rays 3 emitted from the light-emitting surface 12 reach the same distance from all points on the photosensitive chip.

[0057] In summary, the lens module in this embodiment has a front optical section 2 positioned in front of the rear prism 1 to guide light 3 to the incident light surface 11. Furthermore, the light 3 can be refracted sequentially at the exiting light surface 12 and the first reflecting surface 131 in the rear prism 1, achieving a folding of the first optical path 31 and reducing the overall size of the optical lens assembly. On the other hand, the first reflecting surface 131 is configured to bend towards the incident light surface 11 to increase the illumination area. This improves the illumination area of ​​the exiting light surface 12, effectively enhancing image clarity, especially in low ambient light conditions. Moreover, the area of ​​the photosensitive surface 41 is effectively increased, for example, from 1 inch to 1.35 inches. Simultaneously, by improving the propagation direction of the end optical path, a larger photosensitive element can be used without increasing the overall size, significantly improving image quality.

[0058] Specifically, in the second embodiment, the photosensitive surface 41 has dimensions of 12.8mm in length, 9.6mm in width, and 16mm in diagonal, corresponding to the size of a 1-inch mobile phone screen. In the third embodiment, the photosensitive surface 41 has dimensions of 17.3mm in length, 13mm in width, and 22mm in diagonal, corresponding to the size of a 1.35-inch mobile phone screen, increasing the area of ​​the photosensitive surface 41 by approximately 82%. The direct benefit of this is improved image quality. Similar to the significant leap from a standard-level main camera lens to a flagship or even professional-level lens, this greatly improves the user experience. Furthermore, as... Figure 1 As shown, the imaging unit 4 can be tilted within the housing cavity, that is, the imaging unit 4 is tilted relative to the extending direction of the housing cavity. This reduces the overall thickness of the housing. When other conditions (technology generation, lens quality, etc.) are equal, a larger sensor area is the physical basis for achieving a higher theoretical image quality limit, especially in terms of noise control, dynamic range, and depth of field control.

[0059] Optionally, such as Figure 1 and Figure 6As shown, the optical lens assembly also includes a transmission line 5 and a connector 6. The transmission line 5 passes through a clearance hole in the housing and connects between the imaging unit 4 and the connector 6. The connector 6 is used to transmit the image signal generated by the imaging unit 4 to the motherboard of the electronic device.

[0060] In some implementations, such as Figure 1 As shown, the lens module is a periscope lens module. The front optical unit 2 may include a front prism and multiple lens groups, each lens group including a concave lens and a convex lens. The lens groups can correct aberrations in advance. The optical lens group also includes a zoom unit, which can drive at least one lens group to move between the front prism and the rear prism 1 to adjust the focal length of the lens module.

[0061] In some implementations, such as Figure 6 As shown, the optical assembly also includes a zoom unit. The zoom unit is used to drive the front optical unit 2 closer to or further away from the first plane 14 to adjust the focal length of the lens module. The front optical unit 2 may also be provided with multiple lens groups.

[0062] Figure 11 This is a simulation diagram of the modulation transfer function of the rear prism 1 provided in the second embodiment. Figure 12 This is a simulation diagram of the modulation transfer function of the rear prism 1 provided in the third embodiment of the present invention. The horizontal axis represents spatial frequency, which describes the density of details in the image; a higher value indicates denser details, i.e., higher image resolution. The vertical axis represents the modulation transfer function value, i.e., the transfer efficiency of contrast or sharpness; a lower number indicates greater loss. Different colored lines represent incident light of different wavelengths.

[0063] like Figures 11-12 As shown, the modulation transfer function (MJF) of both the second and third embodiments decreases with increasing spatial frequency, but the third embodiment exhibits lower segment dispersion. At a spatial frequency of 100, the MJF value of the third embodiment (0.75) is greater than that of the second embodiment. Therefore, the third embodiment exhibits better optical performance than the second embodiment.

[0064] In an alternative implementation, the lens module in the above embodiments can be applied to an electronic device. This electronic device includes, but is not limited to, mobile phones, laptops, drones, smartwatches, or smart glasses.

[0065] In summary, the electronic device in this embodiment has a front optical unit 2 disposed in front of the rear prism 1 to guide light 3 to the light-incident surface 11. Furthermore, the light 3 can be refracted sequentially at the light-out surface 12 and the first reflecting surface 131 in the rear prism 1, achieving folding of the first optical path 31 and reducing the overall size of the optical lens assembly. On the other hand, the first reflecting surface 131 is configured to bend towards the light-incident surface 11 to increase the illumination area. This improves the illumination area of ​​the light-out surface 12. Especially in low ambient light conditions, this effectively improves image clarity. In addition, the area of ​​the photosensitive surface 41 is effectively increased, for example, from 1 inch to 1.35 inches. Simultaneously, by improving the propagation direction of the end optical path, a larger photosensitive element can be used without increasing the overall size, significantly improving image quality.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical lens assembly, characterized in that, The optical lens assembly includes: Front optical unit (2); and The rear prism (1) has a light-emitting surface (12), a light-incident surface (11), and a first reflecting surface (131); The rear prism (1) is configured such that light (3) enters the rear prism (1) from the light-incident surface (11) and forms a first light path (31) within the rear prism (1). In the first light path (31), the light (3) is reflected by the light-exiting surface (12) to the first reflecting surface (131), and the first reflecting surface (131) reflects the light (3) to the light-exiting surface (12) and exits from the light-exiting surface (12). The first reflecting surface (131) bends toward the light-exiting surface (12) to increase the illumination area.

2. The optical lens assembly according to claim 1, characterized in that, One side of the first reflective surface (131) is adjacent to the light-emitting surface (12), and the other side gradually moves away from the light-emitting surface (12).

3. The optical lens assembly according to claim 1, characterized in that, One side of the light-incident surface (11) is adjacent to the light-outceasing surface (12), and the other side gradually moves away from the light-outceasing surface (12) and extends toward the first reflective surface (131). The light-incident surface (11) is bent toward the light-outceasing surface (12) to correct aberrations.

4. The optical lens assembly according to claim 3, characterized in that, The light-incident surface (11) and the light-exit surface (12) are both bent toward opposite sides to correct aberrations.

5. The optical lens assembly according to claim 1, characterized in that, The rear prism (1) also has a second reflective surface (132), which is spaced apart from the first reflective surface (131); The light ray (3) forms a second light path (32) in the rear prism (1). In the propagation direction of the light ray (3), the second light path (32) is located before the first light path (31). In the second light path (32), the second reflective surface (132) reflects the light ray (3) to the light-emitting surface (12) or at least part of the light-emitting surface (12) and at least part of the light-incident surface (11).

6. The optical lens assembly according to claim 5, characterized in that, The rear prism (1) has a first plane (14), the first plane (14) has the light-incident surface (11) and the light-exit surface (12), the light-incident surface (11) is correspondingly arranged with the second reflective surface (132), and the light-exit surface (12) is correspondingly arranged with the first reflective surface (131); In the second optical path (32), the second reflective surface (132) reflects the light ray (3) to the first plane (14), and in the first optical path (31), the first reflective surface (131) receives the reflected light ray (3) from the first plane (14).

7. The optical lens assembly according to claim 6, characterized in that, The side of the second reflective surface (132) away from the first reflective surface (131) is adjacent to the light-incident surface (11). The side of the second reflective surface (132) close to the first reflective surface (131) gradually moves away from the light-incident surface (11), and the second reflective surface (132) bends toward the light-incident surface (11).

8. The optical lens assembly according to claim 7, characterized in that, The first reflective surface and the second reflective surface are arranged in a mirror-symmetric manner.

9. The optical lens assembly according to claim 7, characterized in that, The rear prism (1) has a groove (15) located between the first reflective surface (131) and the second reflective surface (132) and facing away from the first plane (14). The groove (15) is offset from the first optical path (31) and the second optical path (32).

10. The optical lens assembly according to any one of claims 1-9, characterized in that, The rear prism (1) is made of high-refractive-index, low-dispersion glass, and the first reflective surface (131) is provided with a reflective layer.

11. A lens module, characterized in that, The lens module includes: The imaging unit (4) has a photosensitive surface (41); and According to any one of claims 1-10, the first reflecting surface (131) reflects the light (3) through the light-emitting surface (12) to the photosensitive surface (41).

12. An electronic device, characterized in that, The electronic device includes: The lens module as described in claim 11.

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