Prism, lens module and electronic equipment

Abstract

The invention provides a prism, a lens module and an electronic device, the prism comprises a light incident section, the light incident section is provided with an incident surface, a first reflecting surface and a first connecting surface which are connected in sequence, and an included angle between the incident surface and the first reflecting surface is less than 45 degrees; the incident surface is configured to allow incident light to vertically pass through, and the first reflecting surface is configured to reflect the incident light into reflected light; the extension section is connected with the first connecting surface of the light incident section, and the extension section is configured to transmit reflected light; the light emitting section is arranged on the side, away from the light incident section, of the extension section, the light emitting section is provided with an emergent surface, a second reflecting surface and a second connecting surface which are connected in sequence, the second connecting surface of the light emitting section is connected with the extension section, the second reflecting surface is configured to reflect reflected light into emergent light, and the emergent surface is configured to allow the emergent light to penetrate out. The prism can improve the display quality while reducing the thickness of the lens.

Description

Technical Field

[0001] The present invention relates to the field of optical technologies, and in particular, to a prism, a lens module, and an electronic device. Background Art

[0002] In the field of lenses, the technology of telephoto lenses has rapidly emerged and become a key component of camera technology. In the optical path design of lenses, although the traditional front-mounted layout of prisms is popular, the vertical installation of image sensors increases the Z-axis height, which limits its application. To address this challenge, the industry has introduced innovative designs.

[0003] A certain smartphone adopts a new periscope solution, horizontally places the image sensor at the bottom, changes the prism shape from a triangular prism to a polygon, has an initial reflection angle less than 45°, and places it behind the lens, forming a rear-mounted layout of the prism, significantly reducing the lens height. Another mobile phone also adopts a similar design, but the image sensor is horizontally installed in an inverted manner. Both reduce the module thickness by reducing the initial reflection angle θ of the prism. However, both of these solutions highly rely on total internal reflection propagation and have multiple reflections (3 times or more), resulting in a complex optical path, posing higher requirements for prism coating and overall design, and being prone to ghosting problems.

[0004] Therefore, how to improve the display quality while reducing the lens thickness has become a difficult problem to be solved urgently. Summary of the Invention

[0005] Embodiments of the present application provide a prism, a lens module, and an electronic device, which can improve the display quality while reducing the lens thickness.

[0006] Embodiments of the present application provide a prism, including:

[0007] An incident light section, the incident light section has an incident surface, a first reflection surface, and a first connection surface connected in sequence, the incident surface is configured to allow incident light to pass through, the first reflection surface is configured to reflect the incident light into reflected light, and the incident angle of the incident light is less than 45°;

[0008] An extension section, the extension section is connected to the first connection surface of the incident light section, and the extension section is configured to transmit the reflected light;

[0009] An outgoing light section, the outgoing light section is arranged on a side of the extension section away from the incident light section, the outgoing light section has an exit surface, a second reflection surface, and a second connection surface connected in sequence, the second connection surface of the outgoing light section is connected to the extension section, the second reflection surface is configured to reflect the reflected light into outgoing light, and the exit surface is configured to allow the outgoing light to pass through.

[0010] In some embodiments, the extension segment has opposite first and second extension surfaces. The first extension surface is connected to the incident surface and the second reflection surface respectively. An obtuse angle is formed between the first extension surface and the incident surface. The second extension surface is connected to the first reflection surface and the exit surface respectively.

[0011] In some embodiments, the incident surface is parallel to the exit surface; the first reflection surface is parallel to the second reflection surface; the first extension surface is parallel to the second extension surface.

[0012] In some embodiments, the included angle between the incident surface and the first reflection surface is θ, the included angle between the incident surface and the first extension surface is 2θ + 90°, the included angle between the first extension surface and the second reflection surface is θ + 90°, the included angle between the second reflection surface and the exit surface is θ, the included angle between the exit surface and the second extension surface is 2θ + 90°, and the included angle between the first reflection surface and the second extension surface is θ + 90°, where θ is less than 45°.

[0013] In some embodiments, the prism further includes a first light-shielding layer disposed on the first extension surface; and / or, a second light-shielding layer disposed on the second extension surface.

[0014] In some embodiments, the light-incident segment, the extension segment, and the light-exit segment are integrally formed.

[0015] In some embodiments, the prism further includes a first convex lens connected to the light-incident segment, the first convex lens being disposed corresponding to the incident surface, and the first convex lens protruding toward the side away from the light-incident segment; and / or, a second convex lens connected to the light-exit segment, the second convex lens being disposed corresponding to the exit surface, and the second convex lens protruding toward the side away from the light-exit segment.

[0016] An embodiment of the present application further provides a lens module, including:

[0017] A first lens group;

[0018] A prism, the prism being the above-mentioned prism, the prism being on the light-exit side of the first lens group, and the incident surface of the prism being disposed opposite to the first lens group;

[0019] A second lens group disposed on the exit surface of the prism;

[0020] An image sensor on the light-exit side of the second lens group.

[0021] In some embodiments, the lens module further includes a motor, which is connected to the first lens group and configured to push the first lens group to move so as to adjust the distance between the first lens group and the prism.

[0022] An embodiment of the present application further provides an electronic device, including:

[0023] A lens module, which is the above-mentioned lens module;

[0024] An image processor, which is communicatively connected to the image sensor and is used to obtain image data from the image sensor and process the image data.

[0025] In the prism, lens module, and electronic device provided by the embodiments of the present application, the prism includes a light incident section, an extension section, and a light exit section, aiming to achieve efficient folding and compact layout of the light path, while improving the optical performance. The incident surface of the light incident section faces the light source directly, ensuring that the incident light enters perpendicularly and reducing the initial loss. The included angle between the incident surface and the first reflection surface is less than 45°. This design not only maintains the small-angle characteristic of the reflected light but also utilizes the advantages of low loss and good directivity when light propagates at a small angle in the medium. The extension section serves as a bridge connecting the light incident section and the light exit section, ensuring the "turn-back" propagation of light in the extension section. This design not only compresses the thickness of the prism but also increases the effective propagation path of light inside the prism, providing more operating space for subsequent reflection and exit. This prism design avoids the total reflection and ghost phenomena caused by multiple reflections in traditional prisms. Light directly propagates from the first reflection surface to the second reflection surface in the extension section, reducing unnecessary reflections and significantly reducing the generation of ghosts, thereby improving the purity and contrast of the image. Through the innovative structural layout and precise optical control, this prism achieves efficient folding and compact layout of the light path while optimizing the optical performance. This not only enables the prism to effectively reduce its own thickness but also significantly improves the display quality, bringing a clearer and more realistic visual experience to users. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is the first structural schematic diagram of the prism provided by the embodiment of the present application.

[0028] Figure 2 It is the second structural schematic diagram of the prism provided by the embodiment of the present application.

[0029] Figure 3 This is the third schematic structural diagram of the prism provided by the embodiment of the present application.

[0030] Figure 4 This is the first schematic structural diagram of the lens module provided by the embodiment of the present application.

[0031] Figure 5 This is the second schematic structural diagram of the lens module provided by the embodiment of the present application. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0033] The embodiment of the present application provides a prism, a lens module and an electronic device, which can improve the display quality while reducing the thickness of the lens. The following is an illustration in conjunction with the accompanying drawings.

[0034] Please refer to Figure 1 , Figure 1 This is the first schematic structural diagram of the prism provided by the embodiment of the present application.

[0035] The embodiment of the present application provides a prism 10. The prism 10 is an optical element that changes the propagation direction of light through reflection and refraction on different internal surfaces. The prism 10 in the present application not only realizes the efficient folding and compact layout of the optical path in the structural design, but also significantly optimizes the optical performance, especially showing significant advantages in reducing ghosting and improving the display quality.

[0036] The prism 10 includes a light incident section 11, an extension section 12 and a light exit section 13. The light incident section 11 has a sequentially connected incident surface 111, a first reflection surface 112 and a first connection surface, and the angle between the incident surface 111 and the first reflection surface 112 is less than 45°. The incident surface 111 is configured to allow incident light to pass through vertically, and the first reflection surface 112 is configured to reflect the incident light into reflected light.

[0037] The light incident section 11 serves as the initial part where light enters the prism 10. Its incident surface 111 is designed to face the light source directly, ensuring that the incident light can enter perpendicularly along the thickness direction and reducing the initial loss of light. The angle between the incident surface 111 and the first reflection surface 112 is carefully set to be less than 45°. This design not only ensures that both the incident angle and the reflection angle of the reflected light are less than 45°, but also cleverly utilizes the propagation characteristics of light in the medium, that is, at a smaller angle, light is more likely to maintain lower loss and higher directivity.

[0038] The extension section 12 is connected to the first connection surface of the light incident section 11 and is configured to transmit the reflected light. As a bridge connecting the light incident section 11 and the light exit section 13, the extension section 12 is designed to maximize the utilization of the internal space of the prism 10 and achieve an effective folding of the light path. When the reflected light propagates stably in the extension section 12, since both the incident angle and the reflection angle of the reflected light are less than 45°, the reflected light can be offset in the thickness direction towards the direction close to the incident surface 111 during propagation in the extension section 12. This "folding back" design not only effectively compresses the overall thickness of the prism 10, but also increases the effective propagation path length of light inside the prism 10, providing more operating space for subsequent reflection and exit.

[0039] The light exit section 13 is provided on the side of the extension section 12 away from the light incident section 11. The light exit section 13 has an exit surface 131, a second reflection surface 132, and a second connection surface connected in sequence. The second connection surface of the light exit section 13 is connected to the extension section 12. The second reflection surface 132 is configured to reflect the reflected light into the exit light, and the exit surface 131 is configured to allow the exit light to pass through. This light exit end can ensure that the light exits smoothly in the preset direction after two reflections.

[0040] In traditional prism designs, light is prone to light leakage during multiple (at least more than two) reflection processes, resulting in ghosting phenomena. In this embodiment, however, the light directly propagates from the first reflection surface 112 to the second reflection surface 132 during the propagation in the extension section 12, avoiding total reflection. This design effectively reduces unnecessary reflections of light inside the prism 10, thereby significantly reducing the generation of ghosts and enhancing the purity and contrast of the image. By precisely controlling the propagation path of light inside the prism 10, this embodiment ensures that the exit light has high directivity and consistency, which is crucial for improving the color accuracy, brightness uniformity, and viewing angle range of display devices. Especially in high-brightness and high-resolution display applications, this design can significantly enhance the user's visual experience.

[0041] Please refer to Figure 2 , Figure 2This is the second structural schematic diagram of the prism provided by the embodiment of the present application. The extension section 12 has opposite first extension surface 121 and second extension surface 122. Through carefully designed angles and connection methods, these two surfaces ensure the stable transmission of light within the extension section 12.

[0042] The first extension surface 121 is respectively connected to the incident surface 111 and the second reflection surface 132, and the second extension surface 122 is respectively connected to the first reflection surface 112 and the exit surface 131. In the prism 10, the incident surface 111 and the first extension surface 121 enclose and form a first accommodation space 14, and the exit surface 131 and the second extension surface 122 enclose and form a second accommodation space 15, effectively reducing the thickness.

[0043] In order to ensure the stable transmission of the reflected light within the extension section 12, an obtuse angle is formed between the first extension surface 121 and the incident surface 111, and it is ensured that all the reflected light is transmitted within the extension section 12 to the light exit section 13, which helps to improve the efficiency and reliability of the optical system. If light is lost or deviates from the predetermined path during transmission, it will lead to a decline in the performance of the optical system and even fail to meet the application requirements.

[0044] Furthermore, the transmission direction of the reflected light is approximately parallel to the first extension surface 121 or the second extension surface 122. When the transmission direction of the reflected light is approximately parallel to the extension surface, the transmission path of the light within the extension section 12 is more stable. In an optical system, it is often necessary to precisely control the direction and position of light to achieve specific functions. When the transmission direction of the reflected light is approximately parallel to the extension surface, it is easier to achieve precise control and adjustment of the light. This helps to improve the accuracy and stability of the optical system, thus meeting a wider range of application requirements.

[0045] The parallel or specific angular relationship between the incident surface 111, the exit surface 131, the first reflection surface 112, the second reflection surface 132, the first extension surface 121, and the second extension surface 122 is the key to achieving stable light transmission and precise control.

[0046] The incident surface 111 is parallel to the exit surface 131. The parallelism between the incident surface 111 and the exit surface 131 ensures that the overall transmission direction of light in the optical system remains consistent. This helps to reduce the deflection and loss of light during transmission, and improve the efficiency and stability of the optical system.

[0047] The first reflection surface 112 is parallel to the second reflection surface 132. The parallelism between the first reflection surface 112 and the second reflection surface 132 means that similar reflection behaviors will occur on these two reflection surfaces. This helps to maintain the directionality and intensity of light, ensuring that the light can be transmitted along the predetermined path.

[0048] The first extended surface 121 is parallel to the second extended surface 122. The parallelism between the first extended surface 121 and the second extended surface 122 further ensures the stable transmission of light within the extended section 12. The design of the parallel extended surfaces reduces the loss and deflection of light caused by minute undulations or defects on the extended surfaces, improving the performance of the optical system.

[0049] The angle between the incident surface 111 and the first reflecting surface 112 is θ, where θ is less than 45°. The angle between the incident surface 111 and the first extended surface 121 is 2θ + 90°. The angle between the first extended surface 121 and the second reflecting surface 132 is θ + 90°. The angle between the second reflecting surface 132 and the exit surface 131 is θ. The angle between the exit surface 131 and the second extended surface 122 is 2θ + 90°. The angle between the first reflecting surface 112 and the second extended surface 122 is θ + 90°. Among them, the above specific angular relationships are the basis for achieving precise light control. By precisely calculating these angles, it can be ensured that light is transmitted within the optical system along a predetermined path and at a predetermined angle, realizing specific optical functions.

[0050] The magnitude of the angle θ directly affects the reflection angle and direction of light on the reflecting surface. By adjusting the value of θ, the transmission path and angle of light can be precisely controlled to meet different application requirements.

[0051] The prism 10 can be symmetrically designed, which not only improves the processing accuracy and manufacturing efficiency of the prism 10, but also brings optical advantages to the lens module 100. The symmetric design of the prism 10 simplifies its internal structure, making the transmission path of light within the prism 10 more intuitive and controllable. This design reduces the reflection and scattering of light caused by complex interfaces within the prism 10, thereby reducing light energy loss and improving light utilization efficiency. In addition, the symmetric design helps to eliminate or reduce aberrations caused by the irregular shape of the prism 10, further improving the clarity and sharpness of imaging.

[0052] The prism 10 further includes a first light-shielding layer, which is disposed on the first extended surface 121. Its function is to absorb or block the light that is not expected to enter the optical system, namely stray light. These stray lights may come from reflections and scatterings within the prism 10 or interference from the external environment. If not controlled, they will have a negative impact on the performance of the optical system.

[0053] The first light-shielding layer can be a black ink layer. The black ink layer can effectively absorb most of the incident light, reducing reflection and scattering, thereby reducing the interference of stray light. In addition, the black ink layer also has good adhesion and weather resistance, ensuring a stable light-shielding effect during long-term use. The first light-shielding layer can also reduce the multiple reflections and scatterings of light within the prism 10, reducing energy loss and improving the efficiency of the optical system.

[0054] The prism 10 further includes a second light-shielding layer disposed on the second extension surface 122. As described above, the function of the second light-shielding layer is the same as that of the material and the effect of the first light-shielding layer, which will not be elaborated here.

[0055] The light incident section 11, the extension section 12, and the light exit section 13 are integrally formed, which improves the overall performance of the optical system. First, the integral formation ensures the precise alignment and tight connection of each part of the prism 10, reducing the light transmission problems caused by assembly errors. Second, the integral formation design simplifies the production and processing process of the prism 10, improving production efficiency and product quality. In addition, this design also enhances the mechanical strength and stability of the prism 10, enabling it to withstand greater external forces without deformation or damage.

[0056] Please refer to Figure 3 , Figure 3 , which is the third structural schematic diagram of the prism provided by the embodiment of the present application. In some cases, the prism 10 further includes a first convex lens 16. The first convex lens 16 is connected to the light incident section 11, and the first convex lens 16 is correspondingly arranged with the incident surface 111. The first convex lens 16 protrudes toward the side away from the light incident section 11 to ensure that the light is first focused by the first convex lens 16 before entering the prism 10. The first convex lens 16 protrudes toward the side away from the light incident section 11. Such a shape design enables the light to refract when passing through the convex lens, so as to be effectively focused or collimated. The focusing or collimating effect of the first convex lens 16 is for improving the energy density of the light when entering the prism 10, reducing light loss, and enhancing the light control ability of the optical system.

[0057] In some other cases, the incident surface 111 of the prism 10 is a curved surface. The incident surface 111 can protrude toward the side away from the light incident section 11, which can focus or collimate the light, having the same or similar effect as the above-mentioned first convex lens 16.

[0058] In some cases, the prism 10 further includes a second convex lens 17. The second convex lens 17 is connected to the light exit section 13, and the second convex lens 17 is correspondingly arranged with the exit surface 131. The second convex lens 17 protrudes toward the side away from the light exit section 13. Echoing the first convex lens 16, the second convex lens 17 is tightly connected to the light exit section 13 of the prism 10, and its position is precisely corresponding to the exit surface 131. The second convex lens 17 also protrudes toward the side away from the light exit section 13. Such a design enables the light to refract again through the convex lens before leaving the prism 10. This refraction effect not only helps the light to diverge or be further focused in a predetermined direction, but also can correct the aberration that may occur during the internal transmission of the light in the prism 10, thereby improving the imaging quality and light transmission efficiency of the optical system.

[0059] In some other cases, the exit surface 131 of the prism 10 is a curved surface. This exit surface 131 can bulge towards the side away from the light-emitting section 13, and can direct or further focus the light rays in a predetermined direction, having the same or similar effect as the above-mentioned second convex lens 17.

[0060] The prism 10 further includes a first reflective film disposed on the first reflective surface 112. The prism 10 further includes a second reflective film disposed on the second reflective surface 132. The main function of the first reflective film or the second reflective film is to enhance the reflection efficiency of light on the reflective surface and reduce the loss of light during reflection. By precisely controlling the thickness, material, and structure of the reflective film, a high reflectivity for light of a specific wavelength can be achieved, thereby optimizing the light transmission path of the optical system. The application of the first reflective film or the second reflective film not only improves the light control ability of the optical system but also makes it possible to achieve more complex optical functions.

[0061] The prism 10 further includes a first antireflection film disposed on the incident surface 111. The prism 10 further includes a second antireflection film disposed on the exit surface 131. The main function of the first antireflection film or the second antireflection film is to reduce the reflection loss of light at the interface and improve the transmission efficiency of light. By precisely matching the refractive index and thickness of the first antireflection film or the second antireflection film, the reflectivity of light of a specific wavelength at the interface can be minimized, thereby achieving a high transmittance.

[0062] By simultaneously providing the first reflective film, the second reflective film, the first antireflection film, and the second antireflection film in the prism 10, the combined advantages of both can be fully utilized. The first reflective film and the second reflective film are used to enhance the reflection efficiency of light on specific reflective surfaces, while the first antireflection film and the second antireflection film are used to reduce the reflection loss of light at the incident surface 111 and the exit surface 131. This combined design not only improves the light control ability of the optical system but also realizes the efficient transmission of light.

[0063] Please refer to Figure 4 , Figure 4 which is the first structural schematic diagram of the lens module provided by the embodiment of the present application. The embodiment of the present application further provides a lens module 100, which includes a first lens group 20, a prism 10, a second lens group 30, and an image sensor 40. The lens module 100 in this solution can be a periscope lens module.

[0064] The first lens group 20 is used to collect and focus light rays from the object to be photographed. The first lens group 20 may include one or more first lenses. The prism 10 is on the light-emitting side of the first lens group 20, and the incident surface 111 of the prism 10 is arranged opposite to the first lens group 20, ensuring that light rays can be efficiently and accurately transmitted from the first lens group 20 into the prism 10, reducing the loss of light energy.

[0065] The prism 10 is the above-mentioned prism 10, so the prism 10 in the embodiment of the present application also has all the technical effects in the above embodiment, which will not be elaborated here. The prism 10 is on the light-emitting side of the first lens group 20, and the incident surface 111 of the prism 10 is arranged opposite to the first lens group 20.

[0066] The second lens group 30 is arranged on the exit surface 131 of the prism 10. The second lens group 30 may include one or more second lenses. The second lens group 30 further finely focuses and optimizes the light rays adjusted by the prism 10 to ensure high definition of the image quality, thereby comprehensively improving the imaging quality.

[0067] The image sensor 40 is on the light-emitting side of the second lens group 30. The image sensor 40 is a key component for converting an optical image into an electrical signal. The high sensitivity and high resolution characteristics of the image sensor 40 enable the lens module 100 to capture delicate and real image information, meeting various high-precision imaging requirements.

[0068] Specifically, the extension section 12 has opposite first extension surface 121 and second extension surface 122. These two surfaces ensure the stable transmission of light rays within the extension section 12 through a carefully designed angle and connection method. The first extension surface 121 is respectively connected to the incident surface 111 and the second reflection surface 132, and the second extension surface 122 is respectively connected to the first reflection surface 112 and the exit surface 131. In the prism 10, the incident surface 111 and the first extension surface 121 enclose a first accommodation space 14, and the exit surface 131 and the second extension surface 122 enclose a second accommodation space 15, effectively reducing the thickness. The first lens group 20 may be arranged at the first accommodation space 14, and the second lens group 30 and the image sensor 40 may be arranged at the second accommodation space 15. It can be understood that the various structures in the lens module 100 are compactly arranged, reasonably reducing the thickness while maintaining the effect of light propagation.

[0069] The lens module 100 further includes a motor, which is connected to the first lens group 20. The motor is configured to push the first lens group 20 to move, so as to adjust the distance between the first lens group 20 and the prism 10. The motor can accurately push the first lens group 20 to move back and forth according to the shooting requirements, thereby dynamically adjusting the distance between the first lens group 20 and the prism 10. This adjustment mechanism is crucial for realizing advanced shooting functions such as autofocus and zoom. It enables the lens module 100 to quickly respond to changes in the shooting environment and ensures clear and sharp images at any distance.

[0070] Please refer to Figure 5 , Figure 5 FIG. 2 is a second schematic structural diagram of the lens module provided by the embodiment of the present application. The lens module 100 further includes a third lens group 50, which is disposed between the first lens group 20 and the prism 10. The distance between the first lens group 20 and the third lens group 50 can be adjusted by the motor, so that the motor moves a shorter distance to realize the macro function.

[0071] In the embodiment of the present application, the function of the motor of the lens module 100 for adjusting the focal length is described as follows.

[0072] In the prior art, when the lens module 100 is a telephoto lens, the focal length of the lens module 100 is above 10 mm. According to formula (1): 1 / μ + 1 / v = 1 / f. In formula (1), μ represents the distance from the object to the lens, usually called the object distance. v represents the distance from the image to the lens, usually called the image distance. f represents the focal length of the lens.

[0073] Assume that the focal length of the lens f = 13.5 mm. If the lens is also driven by a motor for zooming, the motor needs to move about 2100 um when driving the lens to focus from infinity to macro 10 cm (object distance). Currently, the motors with a large stroke are generally within 400 um, that is, currently, it is impossible to achieve 10 cm focusing only by moving the lens with the motor.

[0074] In the embodiment of the present application, the focal length of the first lens group 20 is f1, the focal length of the incident surface 111 of the prism 10 or the first convex lens 16 is f2, and the distance between the first lens group 20 and the prism 10 is d.

[0075] The combined focal length of the first lens group 20 and the prism 10 is formula (2): f1*f2 / (f1 + f2 - d). In formula (2), f1 represents the focal length of the first lens group 20, f2 represents the focal length of the incident surface 111 of the prism 10 or the first convex lens 16, and d represents the distance between the first lens group 20 and the prism 10.

[0076] The focal length of the first lens group 20 is 5 mm, the focal length of the incident surface 111 of the prism 10 or the first convex lens 16 is -7.3 mm, and the distance d is 0.4 mm. According to formula (2), the combined focal length is 13.52 mm.

[0077] After the motor moves the first lens group away from the prism 10 by 0.4 mm (400 um), d changes to 0.8 mm, and the combined focal length changes to 11.77 mm. At this time, the image sensor 40 is equivalent to a lens module 100 with a focal length of 11.73 mm and moves away from the lens module 100 by

[0078] 13.52 mm - 11.77 mm = 1.75 mm, that is, it can achieve focusing close to 9 cm.

[0079] It can be seen that only by moving the first lens group 20 by a small distance with the motor can long - focal - length focusing be achieved, which further reduces the reserved thickness of the lens module 100.

[0080] When the lens module 100 further includes a third lens group 50, the third lens group 50 needs to be added when calculating or measuring the focal length f2, that is, the combined focal length f2 is obtained from the combination of the incident surface 111 and the third lens group 50, or the combined focal length f2 is obtained from the combination of the first convex lens 16 and the third lens group 50; the third lens group 50 also needs to be added when calculating or measuring the distance d. Since the third lens group 50 is disposed between the first lens group 20 and the incident surface 111, the distance d is the distance between the first lens group 20 and the third lens group 50.

[0081] The embodiment of the present application further provides an electronic device. The electronic device can be a mobile phone, a tablet computer, a desktop computer, a laptop computer, an Ultra - mobile Personal Computer (UMPC), a handheld computer, a netbook, a Personal Digital Assistant (PDA), a wearable electronic device, etc., which have functions of taking pictures or videos. In this embodiment, the electronic device is taken as an example of a mobile phone for description.

[0082] The electronic device includes a housing and a display screen. The housing includes a rear cover and a frame fixedly connected. The rear cover and the frame can be an integral structure or a split structure. The display screen and the rear cover are respectively located on both sides of the frame, and jointly enclose the inner cavity of the electronic device.

[0083] The electronic device further includes a lens module 100 and an image processor. The lens module 100 is the above-mentioned lens module 100. Both the lens module 100 and the image processor are located in the inner cavity of the electronic device. The thickness direction of the image sensor 40 is parallel to the thickness direction of the electronic device. The image processor is communicatively connected to the image sensor 40 and is configured to obtain image data from the image sensor 40 and process the image data. The image processor transmits the processed image data to the display screen.

[0084] The lens module 100 is a rear camera of the electronic device, and the lens module 100 is located at the upper left corner of the back of the electronic device.

[0085] In some other embodiments, the lens module 100 is located at other positions of the electronic device. For example, the lens module 100 is located at the middle upper part or the upper right corner of the back of the electronic device. In some other embodiments, the lens module 100 can also be a front camera of the electronic device.

[0086] Exemplarily, the working principle of the lens module 100 is as follows: The light reflected by the photographed scene generates an optical image through the lens module 100 and projects it onto the photosensitive surface of the image sensor 40. The image sensor 40 is configured to transmit the image signal to the image processor.

[0087] In the prism 10, lens module 100 and electronic device provided by the embodiments of the present application, the prism 10 includes a light incident section 11, an extension section 12 and a light exit section 13, aiming to achieve efficient folding and compact layout of the light path, while improving the optical performance. The incident surface 111 of the light incident section 11 faces the light source directly, ensuring that the incident light enters perpendicularly and reducing the initial loss. The included angle between the incident surface 111 and the first reflection surface 112 is less than 45°. This design not only maintains the small-angle characteristic of the reflected light, but also utilizes the advantages of low loss and good directivity when light propagates at a small angle in the medium. The extension section 12 serves as a bridge to connect the light incident section 11 and the light exit section 13, ensuring the "turn-back" propagation of light in the extension section 12. This design not only compresses the thickness of the prism 10, but also increases the effective propagation path of light inside the prism 10, providing more operating space for subsequent reflection and exit. The design of this prism 10 avoids the total reflection and ghosting phenomena caused by multiple reflections in the traditional prism 10. The light directly propagates from the first reflection surface 112 to the second reflection surface 132 in the extension section 12, reducing unnecessary reflections and significantly reducing the generation of ghosts, improving the purity and contrast of the image. Through the innovative structural layout and precise optical control, the prism 10 realizes the efficient folding and compact layout of the light path, while optimizing the optical performance. This not only enables the prism 10 to effectively reduce its own thickness, but also significantly improves the display quality, bringing a clearer and more realistic visual experience to users.

[0088] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0089] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0090] The prism, lens module, and electronic device provided by the embodiments of the present application have been introduced in detail above. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The descriptions of the above embodiments are only used to help understand the present application. At the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A prism, characterized in that, Comprising: An incident light section, the incident light section having a sequentially connected incident surface, a first reflecting surface, and a first connecting surface, the angle between the incident surface and the first reflecting surface being less than 45°; the incident surface being configured to allow incident light to pass through perpendicularly, the first reflecting surface being configured to reflect the incident light into reflected light; An extending section, the extending section being connected to the first connecting surface of the incident light section, the extending section being configured to transmit the reflected light; An outgoing light section, the outgoing light section being provided on a side of the extending section away from the incident light section, the outgoing light section having a sequentially connected outgoing surface, a second reflecting surface, and a second connecting surface, the second connecting surface of the outgoing light section being connected to the extending section, the second reflecting surface being configured to reflect the reflected light into outgoing light, the outgoing surface being configured to allow the outgoing light to pass through.

2. The prism according to claim 1, characterized in that, The extending section has opposite first and second extending surfaces, the first extending surface being connected to the incident surface and the second reflecting surface respectively, an obtuse angle being formed between the first extending surface and the incident surface, the second extending surface being connected to the first reflecting surface and the outgoing surface respectively.

3. The prism according to claim 2, wherein, The incident surface is parallel to the outgoing surface; the first reflecting surface is parallel to the second reflecting surface; the first extending surface is parallel to the second extending surface.

4. The prism according to claim 3, characterized in that, The angle between the incident surface and the first reflecting surface is θ, the angle between the incident surface and the first extending surface is 2θ + 90°, the angle between the first extending surface and the second reflecting surface is θ + 90°, the angle between the second reflecting surface and the outgoing surface is θ, the angle between the outgoing surface and the second extending surface is 2θ + 90°, the angle between the first reflecting surface and the second extending surface is θ + 90°, wherein, θ is less than 45°.

5. The prism according to claim 2, characterized in that, Further comprising a first light-shielding layer, the first light-shielding layer being provided on the first extending surface; and / or, further comprising a second light-shielding layer, the second light-shielding layer being provided on the second extending surface.

6. The prism according to any one of claims 1 to 5, characterized in that The incident light section, the extending section, and the outgoing light section are integrally formed.

7. The prism according to any one of claims 1 to 5, characterized in that, Further comprising a first convex lens, the first convex lens being connected to the incident light section, the first convex lens being correspondingly arranged with the incident surface, the first convex lens protruding towards a side away from the incident light section; and / or, further comprising a second convex lens, the second convex lens being connected to the outgoing light section, the second convex lens being correspondingly arranged with the outgoing surface, the second convex lens protruding towards a side away from the outgoing light section.

8. A lens module, characterized in that, Comprising: A first lens group; A prism, the prism being the prism according to any one of claims 1 to 7, the prism being on the light-emitting side of the first lens group, the incident surface of the prism being oppositely arranged with the first lens group; A second lens group, the second lens group being provided on the outgoing surface of the prism; An image sensor, the image sensor being on the light-emitting side of the second lens group.

9. The lens module according to claim 8, wherein Further comprising a motor, the motor being connected to the first lens group, the motor being configured to push the first lens group to move so as to adjust the distance between the first lens group and the prism.

10. An electronic device, characterized in that, Comprising: A lens module, the lens module being the lens module according to claim 8 or 9; An image processor, the image processor is communicatively connected to the image sensor, and the image processor is configured to obtain image data from the image sensor and process the image data.

Images