Camera modules and electronic devices

Abstract

This application discloses a camera module and an electronic device, belonging to the field of camera technology. The camera module includes: a first prism, a lens body, a second prism, and an image plane. The lens body is disposed between the first prism and the second prism, and the second prism is disposed between the lens body and the image plane. The lens body includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially. The first lens is disposed near the first prism, and the fourth lens is disposed near the second prism. The first, second, and fourth lenses have positive optical power, and the third lens has negative optical power. The first lens is a spherical lens, and the second, third, and fourth lenses are aspherical lenses.

Description

Technical Field

[0001] This application belongs to the field of camera technology, specifically relating to a camera module and electronic device. Background Technology

[0002] With the widespread use of mobile phones and other electronic devices and people's increasing reliance on camera functions, the camera capabilities of electronic devices have become increasingly important. Telephoto lenses, as one of the most frequently used functions in photography, have become an indispensable feature of electronic devices. Currently, most high-end models are equipped with telephoto lenses, which come in various specifications, but most have a short equivalent focal length, generally 3 to 5 times the focal length of the main camera lens, and their resolution is relatively poor. Summary of the Invention

[0003] The purpose of this application is to provide a camera module and electronic device that can solve the problems of short equivalent focal length and poor resolution of telephoto lenses in existing electronic devices.

[0004] In a first aspect, embodiments of this application propose a camera module, including: a first prism, a lens body, a second prism, and an image plane, wherein the lens body is disposed between the first prism and the second prism, and the second prism is disposed between the lens body and the image plane; The lens body includes a first lens, a second lens, a third lens, and a fourth lens arranged in sequence. The first lens is located on the side closer to the first prism, and the fourth lens is located on the side closer to the second prism. The first lens, the second lens, and the fourth lens have positive optical power, the third lens has negative optical power, the first lens is a spherical lens, and the second lens, the third lens, and the fourth lens are aspherical lenses.

[0005] Secondly, embodiments of this application provide an electronic device, including: case; A camera module, wherein the camera module is the camera module according to the first aspect.

[0006] In an embodiment of this application, the camera module includes: a first prism, a lens body, a second prism, and an image plane. The lens body is disposed between the first prism and the second prism, and the second prism is disposed between the lens body and the image plane. The lens body includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially. The first lens is disposed on the side closer to the first prism, and the fourth lens is disposed on the side closer to the second prism. The first, second, and fourth lenses have positive optical power, the third lens has negative optical power, the first lens is a spherical lens, and the second, third, and fourth lenses are aspherical lenses. Thus, by employing a lens body composed of one spherical lens and three aspherical lenses, and by rationally setting the positive and negative optical powers of each lens, the equivalent focal length of the lens can be lengthened, and the system's resolution can be improved.

[0007] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0008] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a top view of a camera module according to an embodiment of this application; Figure 2 This is a schematic diagram of light reflection from a camera module according to an embodiment of this application; Figure 3 This is a cross-sectional view of a camera module according to an embodiment of this application; Figure 4 This is a defocus MTF diagram of a camera module according to an embodiment of this application. Detailed Implementation

[0009] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0010] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and do not limit the number of objects; for example, a first object can be one or more. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0011] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0012] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0013] The camera module provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0014] Please see Figure 1 , Figure 1 This is a schematic diagram of the camera module provided in an embodiment of this application. Figure 1 As shown, the camera module includes: The lens body 102 consists of a first prism 101, a lens body 102, a second prism 103, and an image plane 104. The lens body 102 is disposed between the first prism 101 and the second prism 103, and the second prism 103 is disposed between the lens body 102 and the image plane 104. The lens body 102 includes a first lens 1021, a second lens 1022, a third lens 1023 and a fourth lens 1024 arranged in sequence. The first lens 1021 is located on the side close to the first prism 101, and the fourth lens 1024 is located on the side close to the second prism 103. Among them, the first lens 1021, the second lens 1022 and the fourth lens 1024 have positive optical power, the third lens 1023 has negative optical power, the first lens 1021 is a spherical lens, and the second lens 1022, the third lens 1023 and the fourth lens 1024 are aspherical lenses.

[0015] This application employs a novel optical solution and innovates in system architecture to achieve a compact ultra-telephoto lens. Specifically, a top view of the optical architecture of the camera module provided in this application embodiment is shown below. Figure 1 As shown, the cross-sectional view is as follows Figure 2 As shown, the camera module is an ultra-telephoto lens module, which consists of a first prism 101, a lens body 102, a second prism 103, and an image plane 104 arranged sequentially from the object side to the image side. The lens body 102 contains four lenses, which are a first lens 1021 with positive optical power, a second lens 1022 with positive optical power, a third lens 1023 with negative optical power, and a fourth lens 1024 with positive optical power, respectively, from the first prism 101 to the second prism 103. A certain gap can be left between the four lenses.

[0016] In this embodiment, the first prism 101 is used to deflect the light path. The lens body 102, as the main imaging component, combines the positive and negative optical powers of four lenses to converge light and form a high-quality intermediate image. Simultaneously, it corrects significant aberrations in ultra-telephoto scenes, such as chromatic aberration and spherical aberration, and works in conjunction with the front and rear prisms to complete the light path deflection and image conversion, ultimately achieving clear imaging of distant objects. Here, the lens body 102 can converge the light from distant objects into an inverted real image. The second prism 103 is used to convert the inverted image of the lens body 102 into an upright image through multiple reflections, ultimately transmitting the high-quality upright image to the image plane 104 to complete the imaging process. The image plane 104 refers to the imaging optical chip, used to carry the final clear image and complete the imaging process.

[0017] In this embodiment, the first lens 1021, the second lens 1022, and the fourth lens 1024, with positive optical power, converge light rays, while the third lens 1023, with negative optical power, diverges the incident light beam, similar to the effect of a concave lens. The first lens 1021 is spherical, providing basic positive optical power and initially converging light rays. The second lens 1022, the third lens 1023, and the fourth lens 1024 are aspherical. Through complex surface design, they sequentially correct the spherical aberration and coma generated by the first lens 1021, balancing the optical power, eliminating field curvature and chromatic aberration, and ultimately forming a high-quality intermediate image. In a compact structure, this embodiment uses a combination of a "spherical front end + aspherical correction group" to achieve a balance between ultra-long focal length and high image quality, while controlling cost and manufacturing difficulty.

[0018] This application uses spherical lenses to address front-end processing and cost issues, and aspherical lenses to address aberration correction and image quality issues. Together, they achieve the design goals of a super-telephoto lens: long focal length, high image quality, and compactness. Aspherical lenses are key to improving image quality, while spherical lenses are a basic choice that balances practicality and economy. This arrangement ensures that the lens body 102 can more efficiently correct spherical aberration, chromatic aberration, and other aberrations, thereby improving the overall system's resolving power.

[0019] Optionally, the refractive index of the first lens 1021 is greater than the refractive index of the second lens 1022; The refractive index of the second lens 1022 is less than or equal to the refractive index of the third lens 1023; The refractive index of the third lens 1023 is greater than or equal to the refractive index of the fourth lens 1024.

[0020] Wherein, refractive index n d The refractive index refers to the refractive index of a lens at the d-line (587.6nm, yellow light), reflecting the material's ability to deflect light. The higher the refractive index, the stronger the optical power of the lens at the same curvature, or the thinner and smaller the curvature can be made for the same optical power.

[0021] In some embodiments, the first lens 1021 may have a high refractive index to achieve a high optical power with a small curvature, reduce lens thickness and weight, avoid a decrease in lens barrel stability due to excessive weight of the front lens, and the first lens 1021 has a high Abbe number to reduce its own dispersion, and work with the subsequent negative lens to correct axial / magnification chromatic aberration, thereby achieving a low dispersion and easy correction image quality foundation.

[0022] The second lens 1022 has a lower refractive index and a higher Abbe number, and initially corrects aberrations with low dispersion. Specifically, it uses an aspherical surface to correct the spherical aberration of the first lens 1021, and at the same time forms an achromatic pair with the third lens 1023.

[0023] The third lens, 1023, has a high refractive index and a low Abbe number. It uses high dispersion as the main force for chromatic aberration correction, cancels the dispersion of the positive lens, and uses a large refractive index to balance optical power and correct field curvature.

[0024] The fourth lens, 1024, has a low refractive index and a high Abbe number. It uses low dispersion and aspherical end to correct residual aberrations, ensuring high image quality in the final intermediate image.

[0025] In this embodiment, the refractive indices of the first lens 1021 and the third lens 1023 may be greater than the refractive indices of the second lens 1022 and the fourth lens 1024.

[0026] Optionally, the refractive index of the first lens 1021 is greater than or equal to 1.7, and the Abbe number of the first lens 1021 is greater than or equal to 40. The refractive index of the second lens 1022 is less than or equal to 1.6, and the Abbe number of the second lens 1022 is greater than or equal to 50. The refractive index of the third lens 1023 is greater than or equal to 1.6, and the Abbe number of the third lens 1023 is less than or equal to 28. The refractive index of the fourth lens 1024 is less than or equal to 1.6, and the Abbe number of the fourth lens 1024 is greater than or equal to 50.

[0027] Among them, Abbe number v d Abbe number is a parameter that measures the dispersion ability of a material. The larger the Abbe number, the smaller the dispersion, and the smaller the Abbe number, the larger the dispersion.

[0028] In some embodiments, the first lens 1021 is a spherical lens with a refractive index n. d1 Abbe number v d1 Each satisfies: n d1 ≥1.7, v d1 With a refractive index ≥40, the high refractive index of the first lens 1021 allows it to provide sufficient positive power with a relatively gentle spherical curvature, reducing lens thickness and weight, and adapting to large apertures and processing feasibility. The high Abbe number of the first lens 1021 can reduce its own dispersion and work in conjunction with the subsequent negative lens to correct axial / magnification chromatic aberration, ensuring image quality. Together, the two elements enable the first lens 1021 to still efficiently serve the core function of the lens body 102—converging light and controlling chromatic aberration—despite the limitations of the spherical surface and the front end, providing the first line of defense for high-performance imaging of the super telephoto lens.

[0029] The second lens, 1022, is an aspherical lens with a refractive index n. d2 Abbe number v d2 Each satisfies: n d2 ≤1.6, v d2A refractive index of ≥50 means that a greater curvature is required to obtain sufficient optical power. In this way, the low refractive index of the second lens 1022 can suppress its own dispersion, avoid introducing additional chromatic aberration, and use aspherical surfaces to compensate for the optical power limitation of the low refractive index. Together with the negative lens of the third lens 1023, they form an achromatic pair. The low dispersion of the positive lens and the high dispersion of the negative lens cancel each other out, canceling the total axial chromatic aberration of the first two lenses and avoiding purple fringing on the image plane.

[0030] The third lens, 1023, is an aspherical lens with a refractive index n. d2 Abbe number v d2 Each satisfies: n d3 ≥1.6, v d3 With a refractive index ≤28, the high refractive index of the third lens 1023 can serve as an achromatic dispersion source, working in conjunction with the positive lens to correct chromatic aberration. Furthermore, a high refractive index means that for the same negative optical power, the radius of curvature can be larger, or for the same curvature, the negative optical power can be stronger. Therefore, its high refractive index can be used to achieve high negative optical power with low curvature, optimizing structural compactness. As the intermediate negative lens, the high refractive index of the third lens 1023 can provide sufficient divergence within a limited space, balancing the positive convergence of the first two lenses, avoiding an excessively long lens barrel, and simultaneously reducing lens thickness and weight.

[0031] The fourth lens, 1024, is an aspherical lens with a refractive index n. d2 Abbe number v d2 Each satisfies: n d4 ≤1.6, v d4 With a refractive index ≥50, the low dispersion of the fourth lens element (1024) ensures that it can converge light without introducing new chromatic aberrations, guaranteeing the color purity of the intermediate image and avoiding residual chromatic aberration. Even after correction by the first three elements, residual spherical aberration (such as slight separation of focus between the center and edges), distortion, or field curvature may remain. The aspherical design of the fourth lens element (slightly convex at the center and slightly flat at the edges) precisely adjusts the convergence of light, minimizing these residual aberrations and ensuring high sharpness of the intermediate image. Furthermore, the low refractive index optimizes assembly and cost; the requirements for the optical axis are lower than for high refractive index lenses, and the cost is lower than for special glass, meeting the cost-effectiveness requirements of commercial lenses.

[0032] Optionally, the first surface of the first lens 1021 protrudes toward the first prism 101, and the second surface of the first lens 1021 protrudes toward the second prism 103. The first surface is the side of the first lens 1021 facing the first prism 101, and the second surface is the side of the first lens 1021 facing the second prism 103.

[0033] like Figure 1 and Figure 2As shown, the surface of the first lens 1021 facing the first prism 101 (i.e., the left side in the figure) is convex, that is, convex to the object side. The surface of the first lens 1021 facing the second prism 103 (i.e., the right side in the figure) is convex, that is, convex to the image side. In other words, the first lens 1021 adopts a biconvex lens structure with two convex surfaces to achieve "basic positive optical power" and initially converge long-distance light. The first lens 1021 uses a high refractive index material, combined with the biconvex curved surface of the biconvex lens, to achieve a compact design of "small curvature and large optical power". Spherical lenses have inherent spherical aberration, but the biconvex structure of the biconvex lens can distribute spherical aberration more evenly than other positive lens shapes. In order to collect more light, the front lens of the super telephoto lens has a larger aperture. The biconvex surface of a biconvex lens allows light to enter the lens evenly, maintaining a large light-transmitting area and reducing vignetting. The first lens element, 1021, uses a high Abbe number material, and the biconvex lens structure further reduces the effects of chromatic aberration. The biconvex lens is the most common symmetrical structure in spherical lenses, with mature manufacturing processes, good mass production capabilities, and low cost. Its symmetrical structure has lower requirements for the optical axis, making it suitable as the front-end reference element of the lens body.

[0034] In summary, the first lens element 1021, with its symmetrical convex power distribution, can efficiently achieve the initial convergence of parallel light; its gentle curvature reduces processing difficulty and thickness; it controls initial spherical aberration and chromatic aberration; it is suitable for large-aperture requirements; it lays the groundwork for aberration correction of subsequent aspherical lenses; and finally, with the help of high refractive index and high Abbe number materials, it achieves the design goals of "long focal length, high image quality, and compactness" for super telephoto lenses.

[0035] Optionally, both surfaces of the second lens 1022 and the third lens 1023 protrude toward the first prism 101.

[0036] like Figure 1 and Figure 2 As shown, the second lens 1022 is thick in the middle and thin at the edges, with both sides convex towards the object side. That is, one side (the left side in the figure) is convex and the other side (the right side in the figure) is concave. In other words, the second lens 1022 adopts a "one side convex and one side concave" structure. The second lens 1022 achieves positive optical power with its convex and concave structure, and uses aspherical surfaces to correct spherical aberration and coma. Together with the third lens 1023, it forms an achromatic pair.

[0037] The third lens 1022 is thin in the middle and thick at the edges, with both sides convex towards the object side. That is, one side (the left side in the figure) is convex and the other side (the right side in the figure) is concave. In other words, the third lens 1023 also adopts a "one side convex and one side concave" structure. The third lens 1023 achieves negative optical power with its concave-convex structure, uses aspherical surfaces to balance optical power and correct field curvature, and serves as the main force for achromatic correction to offset the dispersion of the positive lens.

[0038] Optionally, both surfaces of the fourth lens 1024 protrude toward the direction of the second prism 103.

[0039] like Figure 1 and Figure 2 As shown, the fourth lens 1024 is thick in the middle and thin at the edges, with both sides convex towards the image side. That is, one side (the right side in the figure) is convex and the other side (the left side in the figure) is concave. In other words, the third lens 1023 adopts a "one side convex and one side concave" structure. The fourth lens 1024 achieves positive optical power with its concave-convex structure, inheriting aberrations that were not fully corrected by the previous lenses, such as residual spherical aberration and field curvature. At the same time, it actively suppresses new aberrations such as coma and distortion, ultimately allowing the aberrations of the entire system to cancel each other out, achieving clear imaging across the entire field of view from on-axis to off-axis and from the center to the edge.

[0040] Optionally, the absolute value of the ratio of the focal length of the second lens 1022 to the focal length of the first lens 1021 is greater than or equal to 1.7 and less than or equal to 2.3. The absolute value of the ratio of the focal length of the third lens 1023 to the focal length of the camera module is greater than or equal to 0.35 and less than or equal to 0.55. The absolute value of the ratio of the focal length of the fourth lens 1024 to the focal length of the camera module is greater than or equal to 2.2 and less than or equal to 3.5.

[0041] The focal length of the first lens 1021 is f1, the focal length of the second lens 1022 is f2, the focal length of the third lens 1023 is f3, and the focal length of the fourth lens 1024 is f4. The focal length of the camera module, which is also the system focal length, is f. In some embodiments, the focal lengths between the lenses can satisfy the following relationships: 1.7≤|f2 / f1|≤2.3, 0.35≤|f3 / f|≤0.55, 2.2≤|f4 / f|≤3.5.

[0042] In this way, by limiting the focal length ratio of the first lens 1021 and the second lens 1022 to a specific range, the primary aberration and optical power distribution can be balanced. The first lens 1021 dominates the basic convergence, while the second lens 1022 generates reverse complementary primary aberrations through moderately different optical powers, leaving sufficient room for aberration correction of subsequent lenses.

[0043] By limiting the focal length ratio of the third lens 1023 to the system within a suitable range, the aberrations of the front lens can be precisely offset and the field curvature can be adjusted. This can both offset the excessive convergence of the two front positive lenses through appropriate negative optical power, reducing the amplitude of spherical aberration and coma, and pull the refraction path of off-axis light rays back to the ideal image plane through the synergy of curvature and optical power, thus initially correcting the field curvature and making the off-axis focusing plane closer to flat.

[0044] By limiting the focal length ratio of the fourth lens (1024) to the system within a specific range, it is possible to ensure the correction of advanced aberrations and guarantee clarity across the entire field of view. Through high optical power and precise curvature, differential refraction compensation is applied to off-axis rays at different heights, making high-light refraction smoother and low-light refraction more compact, ensuring that the focal point of all rays falls precisely on the same flat image plane.

[0045] In this embodiment, by defining the relationship between the focal lengths of each lens, it is possible to ensure that the total focal length accurately matches the design target and that the lens body 102 can better correct aberrations and improve resolution.

[0046] Optionally, the first lens 1021 is a glass spherical lens, and the second lens 1022, the third lens 1023 and the fourth lens 1024 are plastic aspherical lenses.

[0047] In some embodiments, the first lens 1021 may be a glass spherical lens, which can effectively reduce chromatic aberration and has the advantages of mature processing, low cost, good stability and low assembly requirements, and undertakes the basic focusing and front-end reference tasks.

[0048] The second lens 1022, the third lens 1023, and the fourth lens 1024 can be made of plastic aspherical lenses. They utilize the aberration correction capability of aspherical surfaces to correct spherical aberrations and have the advantages of being lightweight, having good impact resistance, and having low processing costs, thus undertaking the main task of fine aberration correction.

[0049] Optionally, the second prism 103 is a Behan prism.

[0050] In some embodiments, the second prism 103 may be a Behnken prism, which consists of two glass prisms separated by an air gap. It achieves 180° image rotation through total internal reflection and a roof structure. The Behnken prism folds the light beam that would otherwise require a long distance by reversing the optical path, shortening the overall physical length of the lens and achieving a balance between ultra-long focal length and portability.

[0051] like Figure 3 As shown, by setting a reflector 103 between the lens body 102 and the image plane 104, light can be reflected five times inside the reflector 103, which can help reduce the overall size of the lens and realize a small-volume super telephoto lens.

[0052] Optionally, the first prism 101 is a right-angle prism.

[0053] In some embodiments, the first prism 101 may be a right-angle prism, which can effectively deflect the light path and compress the physical length of the lens barrel. The right-angle prism is located between the object side and the lens body 102, and can deflect the light incident from the object side and transmit it to the lens body 102 with a suitable aperture and direction, ensuring that the lens body 102 can efficiently converge the light in the deflected light path and avoid beam obstruction or efficiency loss.

[0054] The practical application of the embodiments of this application is illustrated below with reference to some specific examples: In some embodiments, the designed lens body 102 has an even-order aspherical surface shape, satisfying the aspherical formula describing an aspherical surface as follows:

[0055] Among them, parameters c = 1 / R, which is the curvature corresponding to the radius; r It is the perpendicular distance from a point on the optical surface to the optical axis; z This represents the sag of the point along the optical axis; K Let be the quadratic surface coefficient of this surface. Ai Indicates the first i Aspherical coefficient of order.

[0056] In one specific embodiment, such as Figure 1 As shown, the super telephoto lens is arranged from the object side to the image side as follows: a right-angle prism 101, a lens body 102, a prism 103, and an image plane 104. The lens body 102 contains four lenses: a first lens 1021 with positive optical power, a second lens 1022 with positive optical power, a third lens 1023 with negative optical power, and a fourth lens 1024 with positive optical power.

[0057] Specifically, the first lens 1021 is a glass spherical lens, with a refractive index and Abbe number of n respectively. d1 =1.8, v d1 =43; The second lens 1022 is a plastic aspherical lens with a refractive index and Abbe number of n respectively. d2 =1.54, v d2 =55.9; The third lens 1023 is a plastic aspherical lens with a refractive index and Abbe number of n. d3 =1.61, v d3 =25.9; The third lens, 1024, is a plastic aspherical lens with a refractive index and Abbe number of n. d4 =1.54, v d4 =55.9.

[0058] The left surface of the first lens 1021 is convex to the object side, and the right surface is convex to the image side; both surfaces of the second lens 1022 and the third lens 1023 are convex to the object side; both surfaces of the fourth lens 1024 are convex to the image side.

[0059] The focal length of the first lens 1021 is f1, the focal length of the second lens 1022 is f2, the focal length of the third lens 1023 is f3, the focal length of the fourth lens 1024 is f4, the focal length of the system is f, and the following relationships are satisfied: |f2 / f1|=2.01, |f3 / f|=0.45, |f4 / f|=2.6.

[0060] For example, the basic specifications of each lens are shown in Table 1 below, where F# is the system aperture.

[0061] Table 1 Lens Focal Length

[0062] Table 2 below shows the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging system of this embodiment.

[0063] Table 2 Lens Parameters

[0064] Table 3 below shows the aspherical higher-order coefficients of each lens surface in this embodiment.

[0065] Table 3. Coefficients of higher-order terms of lens aspherical surfaces

[0066] The defocus map of the modulation transfer function (MTF) in this embodiment can be shown as follows: Figure 4 As shown in the diagram, the MTF defocus plot shows that at a spatial frequency of 100 lp / mm, the MTF across the entire field of view is greater than 0.6, indicating that this super telephoto lens has extremely high resolution.

[0067] In summary, this application proposes a telephoto optical lens from the perspective of optical system architecture, achieving ultra-telephoto specifications in a relatively small volume. The equivalent focal length of this embodiment is long, applicable to ultra-telephoto optical systems of 8X and above, enhancing the lens's telephoto capability and improving shooting effects. The lens adopts a glass + plastic lens structure, and by rationally combining lens materials, the system's resolving power is improved. A reflector prism is placed between the lens and the image plane, causing light to reflect five times inside the reflector prism, thus reducing the overall size of the lens.

[0068] A camera module according to an embodiment of this application includes: a first prism, a lens body, a second prism, and an image plane. The lens body is disposed between the first prism and the second prism, and the second prism is disposed between the lens body and the image plane. The lens body includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially. The first lens is disposed on the side closer to the first prism, and the fourth lens is disposed on the side closer to the second prism. The first lens, the second lens, and the fourth lens have positive optical power, and the third lens has negative optical power. The first lens is a spherical lens, and the second, third, and fourth lenses are aspherical lenses. Thus, by employing a lens body composed of one spherical lens and three aspherical lenses, and by rationally setting the positive and negative optical powers of each lens, the equivalent focal length of the lens can be lengthened, and the system's resolution can be improved.

[0069] This application also provides an electronic device, including: a housing; and a camera module, wherein the camera module is the same as described in the foregoing embodiments. This electronic device can implement various embodiments of the aforementioned camera module and achieve the same technical effects; therefore, to avoid repetition, it will not be described again here.

[0070] Other components of the electronic device according to the embodiments of this application, such as communication modules and controllers, as well as their operation, are known to those skilled in the art and will not be described in detail here.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A camera module, characterized in that, Comprising: a first prism, a lens body, a second prism and an image plane, the lens body is arranged between the first prism and the second prism, the second prism is arranged between the lens body and the image plane; the lens body comprises a first lens, a second lens, a third lens and a fourth lens arranged in sequence, the first lens is arranged on a side close to the first prism, and the fourth lens is arranged on a side close to the second prism; wherein the first lens, the second lens and the fourth lens have positive refractive power, the third lens has negative refractive power, the first lens is a spherical lens, and the second lens, the third lens and the fourth lens are aspherical lenses.

2. The camera module of claim 1, wherein, The refractive index of the first lens is greater than the refractive index of the second lens; The refractive index of the second lens is less than or equal to the refractive index of the third lens; The refractive index of the third lens is greater than or equal to the refractive index of the fourth lens.

3. The camera module of claim 2, wherein, The refractive index of the first lens is greater than or equal to 1.7, and the Abbe number of the first lens is greater than or equal to 40; The refractive index of the second lens is less than or equal to 1.6, and the Abbe number of the second lens is greater than or equal to 50; The refractive index of the third lens is greater than or equal to 1.6, and the Abbe number of the third lens is less than or equal to 28; The refractive index of the fourth lens is less than or equal to 1.6, and the Abbe number of the fourth lens is greater than or equal to 50.

4. The camera module according to any one of claims 1 to 3, wherein, The first surface of the first lens is convex towards the first prism, the second surface of the first lens is convex towards the second prism, the first surface is a surface of the first lens facing the first prism, and the second surface is a surface of the first lens facing the second prism.

5. The camera module of any one of claims 1-3, wherein, Both surfaces of the second lens and the third lens are convex towards the first prism.

6. The camera module of any one of claims 1-3, wherein, Both surfaces of the fourth lens are convex towards the second prism.

7. The camera module of any one of claims 1-3, wherein, The absolute value of the ratio of the focal length of the second lens to the focal length of the first lens is greater than or equal to 1.7 and less than or equal to 2.3; The absolute value of the ratio of the focal length of the third lens to the focal length of the camera module is greater than or equal to 0.35 and less than or equal to 0.55; The absolute value of the ratio of the focal length of the fourth lens to the focal length of the camera module is greater than or equal to 2.2 and less than or equal to 3.

5.

8. The camera module of any one of claims 1-3, wherein, The second prism is a Porro prism.

9. The camera module of any one of claims 1-3, wherein, The first prism is a right-angle prism.

10. An electronic device, comprising: Comprising: a housing; a camera module, the camera module is according to any one of claims 1 to 9.

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