A long-focus lens and an electronic device

Abstract

The application discloses a long-focus lens and an electronic device, and solves the technical problem that the volume of a long-focus lens increases with the increase of focal length in the prior art. The long-focus lens comprises an incidence unit, an imaging unit and a refractive prism group. The refractive prism group comprises a first prism and a second prism. The first prism is located at an exit opening of the incidence unit, and the imaging unit is located at an exit opening of the second prism. The first prism and the second prism are both provided with a reflecting surface, at least one of the first prism and the second prism is provided with two or more reflecting surfaces, and the reflecting surfaces are arranged at an angle. Light passes through the incidence unit, the reflecting surface in the first prism and the reflecting surface in the second prism in sequence and then enters the imaging unit. The long-focus lens disclosed by the application shortens the overall length of the lens by the reflection and refraction of light by the prism, so that the camera module can maintain a small volume under the condition of achieving the same focal length.

Description

Technical Field

[0001] This application belongs to the field of optical lens technology, specifically relating to a telephoto lens and an electronic device. Background Technology

[0002] With the increasing multifunctionality of various electronic products, camera functionality has become an essential feature in many devices, such as smartphones and tablets. Consequently, lens components have become a necessary part of these electronic devices. As users' demands for imaging capabilities in portable electronic devices continue to rise, mobile phone camera devices are developing towards higher resolution, wider field of view, lighter weight, and greater versatility. This requires the optical imaging system in the camera device to possess multiple characteristics, including large aperture, long focal length, wide field of view, compact structure, high image quality, and low distortion. However, because portable electronic devices are expected to have a small size, the size of the optical imaging system mounted on them is also limited. To capture images of distant objects, a longer focal length is needed, but a longer focal length means a longer optical path, leading to a larger lens size, which contradicts the size limitations of the optical imaging system in portable electronic devices. Utility Model Content

[0003] To address the aforementioned technical problems, this application discloses a telephoto lens and an electronic device.

[0004] The technical solution adopted to achieve the purpose of this application is as follows: In the first aspect of this application, this utility model discloses a telephoto lens, comprising: Incident unit; Imaging unit; and A refractive prism assembly includes a first prism and a second prism, which are arranged adjacent to each other. The first prism is located at the light outlet of the incident unit, and the imaging unit is located at the light outlet of the second prism. Both the first prism and the second prism are provided with reflective surfaces, and at least one of the first prism and the second prism is provided with two or more reflective surfaces. Each reflective surface is arranged at an angle. Light passes sequentially through the incident unit, the reflective surface in the first prism, and the reflective surface in the second prism before entering the imaging unit.

[0005] In some embodiments, the second prism includes two reflective surfaces, namely a first reflective surface and a second reflective surface, wherein the first reflective surface and the second reflective surface are set at an angle, and the angle between the first reflective surface and the second reflective surface is less than 45 degrees, and the light rays pass through the first reflective surface and the second reflective surface in sequence before being directed toward the imaging unit.

[0006] In some embodiments, the second prism has a triangular cross-sectional shape, the second reflective surface is perpendicular to the incident surface of the second prism, the second prism also includes a light-transmitting surface, the light-transmitting surface is coplanar with the first reflective surface, the light-transmitting surface is connected to the second reflective surface, the first reflective surface is connected to the incident surface of the second prism, the position of the imaging unit corresponds to the position of the light-transmitting surface, and the light passes through the first reflective surface, the second reflective surface and the light-transmitting surface in sequence before being directed toward the imaging unit.

[0007] In some embodiments, the angle between the first reflective surface and the second reflective surface is greater than 25 degrees, or the incident angle of the light on the first reflective surface is greater than 25 degrees.

[0008] In some embodiments, the first prism includes a third reflective surface and a fourth reflective surface, the incident surface and the exit surface of the first prism are coplanar, and the light rays pass sequentially through the incident surface of the first prism, the third reflective surface, the fourth reflective surface and the exit surface of the first prism before being incident on the incident surface of the second prism.

[0009] In some embodiments, the first prism further includes a fifth reflective surface, which is coplanar with the incident surface of the first prism and is located between the incident surface and the exit surface of the first prism. The light rays pass sequentially through the incident surface of the first prism, the third reflective surface, the fifth reflective surface, the fourth reflective surface and the exit surface of the first prism before being directed toward the incident surface of the second prism.

[0010] In some embodiments, the first prism further includes a sixth reflective surface, which is disposed opposite to the fifth reflective surface. The light is reflected from the third reflective surface to the fifth reflective surface and then directed toward the sixth reflective surface. The light undergoes several reflections between the fifth and sixth reflective surfaces before being directed toward the fourth reflective surface and reflected back to the second prism. The light is reflected one more time on the fifth reflective surface than on the sixth reflective surface.

[0011] In some embodiments, the distance between the first prism and the second prism is greater than 0.001 mm.

[0012] In some embodiments, the incident unit includes an incident prism and a first lens. The incident prism includes an incident inclined plane, which is angled to the first lens so that light rays are reflected off the incident inclined plane and then enter the first lens perpendicularly.

[0013] The technical solution adopted to achieve the purpose of this application is as follows: In the second aspect of this application, this utility model also discloses an electronic device, which includes the telephoto lens described in the first aspect above.

[0014] As can be seen from the above technical solution, the telephoto lens disclosed in this application includes an incident unit, an imaging unit, and a refractive prism group. The refractive prism group includes a first prism and a second prism, which are arranged adjacent to each other. The first prism is located at the light exit port of the incident unit, and the imaging unit is located at the light exit port of the second prism. Both the first prism and the second prism are provided with reflective surfaces, and at least one of the first prism and the second prism is provided with two or more reflective surfaces. Each reflective surface is arranged at an angle, and light passes sequentially through the incident unit, the reflective surface in the first prism, and the reflective surface in the second prism before entering the imaging unit.

[0015] The telephoto lens disclosed in this application changes the propagation path of light by reflecting and refracting light through a prism, thereby shortening the overall length of the lens while achieving the same focal length. This allows the camera module to maintain a small size, meeting the size constraints of optical imaging systems in portable electronic devices. Attached Figure Description

[0016] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0017] Figure 1 This is a schematic diagram of the first telephoto lens disclosed in this application; Figure 2 for Figure 1 A schematic diagram of the second prism; Figure 3 This is a schematic diagram of the second type of telephoto lens disclosed in this application; Figure 4 for Figure 3 A schematic diagram of the first prism in the middle; Figure 5 This is a schematic diagram of the third type of telephoto lens disclosed in this application; Figure 6 for Figure 5 A schematic diagram of the first prism in the middle; Figure 7 This is a schematic diagram of the fourth type of telephoto lens disclosed in this application; Figure 8 for Figure 7 A schematic diagram of the first prism in the middle; Figure 9 This is a schematic diagram of the first planar simulation; Figure 10 This is a schematic diagram of the first simulated MTF test; Figure 11 This is a schematic diagram of the first simulated distortion test; Figure 12 This is a schematic diagram of the second planar simulation; Figure 13 This is a schematic diagram of the second simulated MTF test; Figure 14 This is a schematic diagram of the distortion test in the second simulation. Figure 15 This is a schematic diagram of the third planar simulation; Figure 16 This is a schematic diagram of the third simulated MTF test; Figure 17 This is a schematic diagram of the third simulation distortion test. Explanation of reference numerals in the attached figures: 100, Incident unit; 110, Incident prism; 120, First lens; 200, Refraction prism group; 210, First prism; 211, Third reflecting surface; 212, Fourth reflecting surface; 213, Fifth reflecting surface; 214, Sixth reflecting surface; 220, Second prism; 221, Second reflecting surface; 222, First reflecting surface; 223, Transmitting surface; 300, Imaging unit; 310, Second lens; 320, Imaging surface. Detailed Implementation

[0018] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] This utility model discloses a telephoto lens that can solve the technical problem of increased size of telephoto lenses due to increased focal length in the prior art.

[0022] The technical solution of this application will be described in detail below through specific embodiments: See Figure 1 , Figure 2 and Figure 3 In a first aspect embodiment of this application, a telephoto lens is disclosed, comprising an incident unit 100, an imaging unit 300, and a refractive prism group 200. The refractive prism group 200 includes a first prism 210 and a second prism 220, which are arranged adjacent to each other. The first prism 210 is located at the light exit port of the incident unit 100, and the imaging unit 300 is located at the light exit port of the second prism 220. Both the first prism 210 and the second prism 220 are provided with reflective surfaces, and at least one of the first prism 210 and the second prism 220 is provided with two or more reflective surfaces, each reflective surface being arranged at an angle. Light sequentially passes through the incident unit 100, the reflective surfaces in the first prism 210 and the second prism 220, and then enters the imaging unit 300.

[0023] The telephoto lens disclosed in this embodiment changes the propagation path of light by reflecting and refracting light through a prism, thereby shortening the overall length of the lens while achieving the same focal length. This allows the camera module to maintain a small size, meeting the size constraints of optical imaging systems in portable electronic devices.

[0024] This layout allows light to pass through each optical element in a more compact path during propagation. Compared to a single large prism design, the split prism structure allows for more flexible adjustment of the position and angle of each prism, thereby achieving a more complex and efficient optical path design within a limited space. This effectively shortens the length of the lens along the optical axis, further meeting the miniaturization requirements of portable electronic devices for optical imaging systems.

[0025] Of course, in some implementations, it is also possible to provide only one prism, and that prism has multiple angled reflective surfaces.

[0026] However, the separate design of the first prism 210 and the second prism 220 is easier to process and shape during manufacturing compared to a large, one-piece prism. The machining precision of the smaller prisms is easier to control, reducing scrap rates and improving production efficiency. Simultaneously, the smaller prisms are easier to handle and position during assembly, reducing assembly difficulty and cost. Furthermore, if a prism is damaged or needs replacement, only the individual prism needs to be replaced, without replacing the entire refractive prism assembly 200, further reducing maintenance costs.

[0027] In one embodiment, the incident unit 100 includes an incident prism 110 and a first lens 120. The incident prism 110 includes an incident ramp, which is angled to the first lens 120 so that light is reflected on the incident ramp and then enters the first lens 120 perpendicularly before being directed toward the first prism 110.

[0028] See Figure 1 and Figure 2 In one embodiment, the second prism 220 includes two reflective surfaces, namely a first reflective surface 222 and a second reflective surface 221. The first reflective surface 222 and the second reflective surface 221 are set at an angle, and the angle between the first reflective surface 222 and the second reflective surface 221 is less than 45 degrees. Light rays pass sequentially through the first reflective surface 222 and the second reflective surface 221 before being directed towards the imaging unit 300.

[0029] See Figure 2 The second prism 220 also includes a light-transmitting surface 223, which is coplanar with the first reflective surface 222. The cross-sectional shape of the second prism 220 is a right-angled triangle. One right-angled surface of the second prism 220 is the incident surface, and the other right-angled surface is the second reflective surface 221. The inclined surface of the second prism 220 is divided into two parts: the part corresponding to the imaging unit 300 is the light-transmitting surface 223, which is the exit surface of the second prism 220; the other part of the inclined surface of the second prism 220 is the first reflective surface 222. The light-transmitting surface 223 is connected to the second reflective surface 221, and the first reflective surface 222 is connected to the incident surface of the second prism 220.

[0030] When light enters the second prism 220 from the first prism 210, the light passes through the incident surface of the second prism 220, reaches the first reflective surface 222, is reflected to the second reflective surface 221, and then enters the imaging unit 300 from the light-transmitting surface 223.

[0031] The first reflective surface 222 and the light-transmitting surface 223 are arranged in parallel. This structural layout makes full use of the internal space of the second prism 220, enabling the entire optical system to achieve complex optical path control within a limited space. The parallel arrangement reduces the additional space occupied between optical elements, which helps to achieve the miniaturization and compact design of the telephoto lens, making it easy to integrate into various portable electronic devices and meet the requirements of device thinness and lightness. Since the light-transmitting surface 223 and the incident surface of the second prism 220 are inclined, the imaging unit 300 can be set diagonally above the second prism 220, thereby further realizing the compactness of the telephoto lens.

[0032] In one embodiment, the angle between the first reflective surface 222 and the second reflective surface 221 is greater than 25 degrees, or the incident angle of light on the first reflective surface 222 is greater than 25 degrees, and the angle between the first reflective surface 222 and the second reflective surface 221 is less than 45 degrees.

[0033] When the angle between the first reflective surface 222 and the second reflective surface 221 is greater than 25 degrees, or when the angle of incidence of light on the first reflective surface 222 is greater than 25 degrees, the change in the propagation direction of light during reflection is more significant. This larger angle change helps to better control the direction of light and reduce stray reflections and interference phenomena inside the second prism 220. However, when the angle between the first reflective surface 222 and the second reflective surface 221 is greater than 45 degrees, light may be reflected back to the first reflective surface 222 after being reflected by the second reflective surface 221, or it may directly strike the incident surface of the second prism 220.

[0034] See Figure 3 and Figure 4 In one embodiment, the first prism 210 includes a third reflective surface 211 and a fourth reflective surface 212. The incident surface and the exit surface of the first prism 210 are coplanar. The position of the first lens 120 corresponds to the incident surface of the first prism 210, and the second prism 220 corresponds to the exit surface of the first prism 210. Light rays pass sequentially through the incident surface of the first prism 210, the third reflective surface 211, the fourth reflective surface 212, and the exit surface of the first prism 210 before reaching the incident surface of the second prism 220.

[0035] In this embodiment, the cross-section of the first prism 210 can be an isosceles trapezoid (for a trapezoid, the shorter of the two parallel lines is generally called the upper base, and the longer one is called the lower base), and the cross-section of the second prism 220 can be a right triangle. The incident surface of the second prism 220 is in contact with the lower base of the first prism 210. One oblique side of the first prism 210 is set towards the first lens 120, and the other oblique side of the first prism 210 is set towards the second prism 220. The oblique side of the first prism 210 facing the first lens 120 is the third reflecting surface 211, and the oblique side of the first prism 210 facing the second prism 220 is the fourth reflecting surface 212.

[0036] This design provides more dimensions for adjusting the light propagation path, while also further reducing the lens's back focal length while maintaining a long focal length. By precisely designing the angle between the two reflective surfaces, the reflection direction and angle of light within the first prism 210 can be flexibly controlled, allowing light to enter the second prism 220 in the most suitable way. This flexible optical path control helps meet different imaging needs, such as adjusting the incident angle of light to adapt to a specific imaging system or optimizing the light distribution to improve image uniformity.

[0037] Light rays pass sequentially through the third reflective surface 211 and the fourth reflective surface 212 before entering the second prism 220. This optical path design, involving multiple reflections, can reduce aberrations and distortions to some extent. Each reflection corrects and adjusts the light rays to a certain degree, making the light rays more accurate and stable when entering the imaging unit 300. This helps improve the clarity and accuracy of the image, reduces blurring and distortion, and thus enhances the overall image quality.

[0038] Furthermore, since the exit surface of the second prism 220 in this embodiment is another right-angled surface perpendicular to its incident surface, the imaging unit 300 can be positioned below the second prism 220. By positioning the imaging unit 300 below the second prism 220, the space of the entire telephoto lens can be saved.

[0039] See Figure 5 and Figure 6 In one embodiment, the first prism 210 further includes a fifth reflective surface 213. The fifth reflective surface 213 is coplanar with the incident surface of the first prism 210, and is located between the incident surface and the exit surface of the first prism 210. Light rays sequentially pass through the third reflective surface 211, the fifth reflective surface 213, the fourth reflective surface 212, and the exit surface of the first prism 210 before entering the second prism 220.

[0040] In this embodiment, the cross-section of the first prism 210 is an isosceles trapezoid, and the cross-section of the second prism 220 is a right-angled triangle. The oblique side of the first prism 210 facing the first lens 120 is the third reflective surface 211, and the oblique side of the first prism 210 facing the second prism 220 is the fourth reflective surface 212. The first lens 120 and the second prism 220 are both located on one side of the lower base of the first prism 210, and the lower base of the first prism 210 is the fifth reflective surface 213.

[0041] The addition of a fifth reflective surface 213 further reduces the lens's back focal length. This complex yet ordered optical path design allows light to undergo multiple reflections and refractions within a limited space, thus achieving a telephoto imaging effect. A telephoto lens provides greater shooting distance and stronger magnification capabilities.

[0042] The reduction in back focal length is a significant advantage of this design. In traditional telephoto lens designs, a long back focal length is often required to achieve a long focal length, leading to an increased overall lens size and hindering portability and integration. This design cleverly utilizes the fifth reflective surface 213 within the first prism 210 to alter the light propagation path, causing the light to enter the second prism 220 after multiple reflections. This effectively shortens the lens's back focal length while maintaining the long focal length. This is of great significance for the design of miniaturized and lightweight optical devices, such as mobile phone cameras and portable telescopes, enabling more compact devices that are easier to carry and use.

[0043] See Figure 7 and Figure 8 In one embodiment, the first prism 210 further includes a sixth reflective surface 214. The sixth reflective surface 214 is disposed opposite to the fifth reflective surface 213. Light is reflected from the third reflective surface 211 to the fifth reflective surface 213 and then to the sixth reflective surface 214. After being reflected several times between the fifth reflective surface 213 and the sixth reflective surface 214, the light is directed to the fourth reflective surface 212 and reflected to the second prism 220.

[0044] In this embodiment, the cross-section of the first prism 210 is an isosceles trapezoid, and the cross-section of the second prism 220 is a right-angled triangle. The oblique side of the first prism 210 facing the first lens 120 is the third reflective surface 211, and the oblique side of the first prism 210 facing the second prism 220 is the fourth reflective surface 212. The first lens 120 and the second prism 220 are both located on one side of the lower base of the first prism 210. The lower base of the first prism 210 is the fifth reflective surface 213, and the upper base of the first prism 210 is the sixth reflective surface 214.

[0045] In this process, the light is reflected one more time on the fifth reflective surface 213 than on the sixth reflective surface 214, thus ensuring that the light eventually enters the second prism 220 after being reflected by the fourth reflective surface 212.

[0046] When the angle between the third reflective surface 211 and the first lens 120 is 45 degrees, light rays hitting the third reflective surface 211 will directly strike the fourth reflective surface 212 and then enter the second prism 220. When the angle between the third reflective surface 211 and the first lens 120 is less than 45 degrees, light rays hitting the third reflective surface 211 will directly strike the fifth reflective surface 213, then be reflected back to the fourth reflective surface 212, and then enter the second prism 220. When the fourth reflective surface 212 is far from the third reflective surface 211, the light reflected from the fifth reflective surface 213 will be directed to the sixth reflective surface 214, and then to the fifth reflective surface 213 or the fourth reflective surface 212. When the angle between the third reflective surface 211 and the first lens 120 is greater than 45 degrees, the light that hits the third reflective surface 211 will be directed directly to the sixth reflective surface 214, and then to the fifth reflective surface 213 or the fourth reflective surface 212.

[0047] The addition of a sixth reflective surface 214 further reduces the lens's back focal length. This reduction in back focal length allows for a more compact optical system structure. The spatial arrangement between various optical elements is more rational, reducing unnecessary space waste. This not only benefits the overall device design but also facilitates the integration of the optical system with other electronic components (such as sensors and circuit boards), improving the device's integration and performance. For example, in smartphones, a compact optical lens can better integrate with the phone's camera module, freeing up more space for other functional modules while maintaining image quality.

[0048] Of course, setting the cross-section of the first prism 210 to a trapezoid and the cross-section of the second prism 220 to a right triangle is only one implementation method in this embodiment. In other implementation methods, it is also possible to set the cross-section of the first prism 210 to a right triangle and the cross-section of the second prism 220 to a trapezoid.

[0049] In one embodiment, the distance between the first prism 210 and the second prism 220 is greater than 0.001 mm.

[0050] When light is reflected more than twice inside the prism behind the lens, the optical path inside the prism becomes complex. If the distance between the second prism 220 and the third prism is too small, light is prone to multiple scattering and reflections at the tiny gaps between the prisms during reflection and refraction at different prism surfaces, forming stray light. This stray light interferes with the main optical path, reducing the contrast and sharpness of the image.

[0051] Maintaining a distance greater than 0.001 mm between the second prism 220 and the third prism provides sufficient space for light to propagate and reflect, reduces mutual interference between the prisms, effectively reduces stray light generation, and thus improves image quality.

[0052] In one embodiment, the imaging unit 300 includes a second lens 310 and an imaging surface 320. The imaging surface 310 corresponds to the position of the light-transmitting surface 223 on the second prism 220, and the imaging surface 320 is located on the side of the second lens 310 away from the second prism 220. The imaging surface 320 is arranged parallel to the second lens 310, and the second lens 310 is arranged at an angle to the first lens 120.

[0053] The second lens 310 is arranged parallel to the imaging surface 320, which ensures that the light rays emitted from the prism system are focused onto the imaging surface 320 in a relatively regular manner after passing through the second lens 310.

[0054] The second lens 310 is angled to the first lens 120, which simplifies the structural design of the optical system to some extent. This layout reduces the complex connections and adjustments between optical components, making the entire imaging unit 300 more compact. This compact structure not only reduces the size and weight of the device, making it easier to carry and install, but also improves the stability and reliability of the system.

[0055] In one embodiment, the second lens 310 is arranged perpendicularly to the first lens 120. This perpendicular arrangement allows for a more regular spatial arrangement of the two lenses, facilitating the overall layout and design of the optical system. Compared to other angled arrangements, this layout reduces the complex connections and adjustments between optical elements, resulting in a more compact overall structure.

[0056] See Figure 9 , Figure 12 and Figure 15 This application presents three simulations of the scheme disclosed in the above embodiments. The prism section is simplified in the simulations, transforming the prism with multiple reflections into a flat plate with equal optical path lengths (the more times light refracts within the prism, the longer the path length, and thus the longer the simplified plate; conversely, the shorter the path length). The data for each simulated prism in the three simulations are as follows:

[0057]

[0058]

[0059] See Figure 10 , Figure 13 and Figure 16In the figure, the horizontal axis represents spatial frequency, and the vertical axis represents MTF value. Different colored lines represent MTF values ​​for different fields of view. A higher spatial frequency results in a higher MTF, indicating better imaging clarity of the system. Observation shows that the MTF 125 lp / mm in all three simulations is greater than 50%, indicating that the solutions disclosed in each embodiment of this application can achieve clear imaging.

[0060] See Figure 11 , Figure 15 and Figure 17 In the figure, the horizontal axis represents the magnitude of distortion, and the vertical axis represents the image height / field of view. The smaller the distortion, the smaller the distortion of the system's image. Observation shows that the distortion in the three simulations is less than 2%, indicating that its distortion correction is good and meets the basic requirements.

[0061] The three simulations described above demonstrate that the telephoto lens disclosed in this application produces clear images with good distortion correction, thus meeting the normal usage requirements of telephoto lenses in various application scenarios.

[0062] Through the above embodiments, this application has the following beneficial effects or advantages: The telephoto lens disclosed in this application reflects light through the incident inclined surface of the incident prism 110, causing the light to enter the first lens 120 perpendicularly, thus changing the initial propagation direction of the light. The first and second inclined surfaces in the refractive prism group 200 further refract and reflect the light, replanning the propagation path of the light. This ingenious design of the light propagation path avoids the problem of increased lens size caused by traditional telephoto lenses relying solely on extending the optical path to achieve a long focal length. While ensuring a long focal length, the back focal length of the lens is greatly reduced, allowing the overall size of the telephoto lens to be reduced, better adapting to the strict space requirements of portable electronic devices, and providing possibilities for the miniaturization and thinning design of electronic devices.

[0063] By rationally designing the angular and positional relationships between the incident prism 110, the first lens 120, the refractive prism group 200, and the second lens 310, as well as the reflection and refraction processes of light within the prisms, aberrations can be effectively reduced and imaging quality improved. For example, during the multiple reflections and refractions of light, the propagation direction and angle of the light can be precisely controlled, allowing the light to be focused more accurately on the imaging surface 320, thereby obtaining a clear, high-quality image.

[0064] Based on the same inventive concept, a second aspect of this application discloses an electronic device that includes the telephoto lens disclosed in any of the first aspects of the above-described embodiments.

[0065] The electronic device disclosed in this embodiment uses the aforementioned telephoto lens. Because the overall length of the telephoto lens is relatively short, the electronic device has greater design flexibility in the thickness direction. Taking smartphones as an example, traditional telephoto lenses, due to their considerable length, often cause the back cover of the phone to protrude, affecting the overall aesthetics and grip. However, by using this telephoto lens, the phone can be designed to be thinner and lighter, with a simpler and more streamlined appearance, meeting current consumer aesthetic demands for lightweight and portable electronic products.

[0066] The telephoto lens of this invention can be applied to various electronic devices, such as smartphones and tablets. Due to its smaller size limitations, it adapts well to the development trend of portable electronic devices, providing users with a better photography experience. To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model have been clearly and completely described above with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0067] Therefore, the above detailed description of the embodiments of the present invention disclosed in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0068] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0069] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0070] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 mechanical connection or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0071] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0072] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0073] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A telephoto lens, characterized in that, include: Incident unit; Imaging unit; as well as A refractive prism assembly includes a first prism and a second prism, which are arranged adjacent to each other. The first prism is located at the light outlet of the incident unit, and the imaging unit is located at the light outlet of the second prism. Both the first prism and the second prism are provided with reflective surfaces, and at least one of the first prism and the second prism is provided with two or more reflective surfaces. Each reflective surface is arranged at an angle. Light passes sequentially through the incident unit, the reflective surface in the first prism, and the reflective surface in the second prism before entering the imaging unit.

2. The telephoto lens according to claim 1, characterized in that, The second prism includes two reflective surfaces, namely a first reflective surface and a second reflective surface. The first reflective surface and the second reflective surface are set at an angle, and the angle between the first reflective surface and the second reflective surface is less than 45 degrees. The light passes through the first reflective surface and the second reflective surface in sequence and then shines on the imaging unit.

3. The telephoto lens according to claim 2, characterized in that, The second prism has a triangular cross-sectional shape. The second reflective surface is perpendicular to the incident surface of the second prism. The second prism also includes a light-transmitting surface, which is coplanar with the first reflective surface and connected to the second reflective surface. The first reflective surface is connected to the incident surface of the second prism. The position of the imaging unit corresponds to the position of the light-transmitting surface. The light passes through the first reflective surface, the second reflective surface, and the light-transmitting surface in sequence before being directed toward the imaging unit.

4. The telephoto lens according to claim 3, characterized in that, The angle between the first reflective surface and the second reflective surface is greater than 25 degrees, or the incident angle of the light on the first reflective surface is greater than 25 degrees.

5. The telephoto lens according to claim 1, characterized in that, The first prism includes a third reflective surface and a fourth reflective surface. The incident surface and the exit surface of the first prism are coplanar. The light rays pass sequentially through the incident surface of the first prism, the third reflective surface, the fourth reflective surface and the exit surface of the first prism before hitting the incident surface of the second prism.

6. The telephoto lens according to claim 5, characterized in that, The first prism further includes a fifth reflective surface, which is coplanar with the incident surface of the first prism and is located between the incident surface and the exit surface of the first prism. The light passes sequentially through the incident surface of the first prism, the third reflective surface, the fifth reflective surface, the fourth reflective surface and the exit surface of the first prism before being directed toward the incident surface of the second prism.

7. The telephoto lens according to claim 6, characterized in that, The first prism further includes a sixth reflective surface, which is arranged opposite to the fifth reflective surface. The light is reflected from the third reflective surface to the fifth reflective surface and then shines on the sixth reflective surface. The light undergoes several reflections between the fifth and sixth reflective surfaces and then shines on the fourth reflective surface and is reflected back to the second prism. The light is reflected one more time on the fifth reflective surface than on the sixth reflective surface.

8. The telephoto lens according to any one of claims 1 to 7, characterized in that, The distance between the first prism and the second prism is greater than 0.001 mm.

9. The telephoto lens according to any one of claims 1 to 7, characterized in that, The incident unit includes an incident prism and a first lens. The incident prism includes an incident inclined surface, which is angled to the first lens so that light is reflected off the incident inclined surface and then enters the first lens perpendicularly.

10. An electronic device, characterized in that, Including the telephoto lens as described in any one of claims 1 to 9.

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