Miniaturized telephoto periscopic mobile phone camera

Abstract

The utility model discloses a miniaturized telephoto periscopic mobile phone camera. The miniaturized telephoto periscopic mobile phone camera sequentially comprises a first lens, a second lens, a third lens, a prism and an image surface from an object space to an image space, the first lens has positive focal power; the second lens has negative focal power; the third lens has positive focal power; the prism is provided with an incident plane, a first reflecting plane, a total reflection plane, a second reflecting plane and an emergent plane, the prism is placed at the rear end of the third lens, light rays enter the prism through the incident plane in the first optical axis direction through the third lens, enter the total reflection plane in the second optical axis direction after being reflected by the first reflecting plane, and enter the emergent plane after being totally reflected by the total reflection plane. And the light enters the second reflecting surface along the third optical axis direction, is reflected by the second reflecting surface, exits from the exit surface along the fourth optical axis direction, and exits to the image surface for imaging. According to the utility model, the long focus can be met, and the miniaturization of the mobile phone camera is realized.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging technology, and in particular to a miniaturized telephoto periscope mobile phone camera. Background Technology

[0002] With the development of mobile phone camera technology, the use scenarios of mobile phone cameras are gradually increasing, and telephoto lenses have become an indispensable part of mobile phone cameras, which can be used to meet consumers' needs for shooting from a greater distance.

[0003] However, due to space limitations in mobile phones and the need for long focal lengths, cameras require a significant amount of space, especially in foldable phones. Therefore, structural improvements are necessary to reduce the size of the camera while still meeting the requirements for long focal lengths, making it suitable for use in mobile phones, particularly foldable phones. Utility Model Content

[0004] In view of the above problems, the purpose of this utility model is to provide a miniaturized telephoto periscope mobile phone camera that can meet the requirements of telephoto and achieve miniaturization of mobile phone camera.

[0005] This utility model provides a miniaturized telephoto periscope mobile phone camera. The miniaturized telephoto periscope mobile phone camera includes, in order from object side to image side, a first lens, a second lens, a third lens, a prism, and an image plane. The first lens has positive optical power; the second lens has negative optical power; the third lens has positive optical power; the prism has an incident surface, a first reflecting surface, a total reflection surface, a second reflecting surface, and an exit surface. The prism is placed at the rear end of the third lens. Light passes through the third lens and enters the prism along the first optical axis through the incident surface. After being reflected by the first reflecting surface, it enters the prism along the second optical axis and then enters the total reflection surface. After being totally reflected by the total reflection surface, it enters the second reflecting surface along the third optical axis and then enters the image plane along the fourth optical axis.

[0006] Optionally, the angle between the first optical axis and the second optical axis is between 0° and 90°, the angle between the second optical axis and the third optical axis is between 90° and 180°, the angle between the third optical axis and the fourth optical axis is between 0° and 90°, the first optical axis and the fourth optical axis are parallel to each other, and the incident surface, the total reflection surface and the exit surface are common planes.

[0007] Optionally, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens, the spatial gap T1 between the first lens and the second lens, and the spatial gap T2 between the second lens and the third lens satisfy: CT1+CT2+CT3+T1+T2<2.9mm.

[0008] Optionally, the air gap T3 between the third lens and the prism satisfies: 0.35mm < T3 < 0.65mm.

[0009] Optionally, the effective focal length f of the miniaturized telephoto periscope mobile phone camera and the distance BFL from the image plane of the third lens to the image plane satisfy: 0.7 < f / BFL < 1.1.

[0010] Optionally, the effective focal length f of the miniaturized telephoto periscope mobile phone camera, the effective focal length f1 of the first lens, and the effective focal length f3 of the third lens satisfy: 2 < ((f / f1) + (f / f3)) < 5.

[0011] Optionally, the equivalent prism thickness CT5 of the prism before the folded optical path satisfies: 11mm < CT5 < 14mm.

[0012] Optionally, the thickness CT6 of the prism after folding the optical path satisfies: 3 mm < CT6 < 4 mm.

[0013] Optionally, the maximum effective diameter of the object side of the first lens DT11, the maximum effective diameter of the image side of the first lens DT12, the maximum effective diameter of the object side of the second lens DT21, and the maximum effective diameter of the image side of the second lens DT22 satisfy: 1 ​​< (DT11 + DT21) / (DT12 / DT22) < 1.5.

[0014] Optionally, the angle A between the incident surface of the prism and the first reflecting surface after the optical path is folded satisfies: 31° < A < 35°.

[0015] This utility model provides a miniaturized telephoto periscope mobile phone camera, which, from the object side to the image side, includes a first lens, a second lens, a third lens, a prism, and an image plane in sequence. The first lens has positive optical power; the second lens has negative optical power; and the third lens has positive optical power. The prism has an incident surface, a first reflecting surface, a total reflection surface, a second reflecting surface, and an exit surface. Light passes through the first lens, the second lens, and the third lens in sequence, and after being reflected multiple times by the prism, it forms an image on the image plane. This utility model utilizes only three lenses and one prism to form an L-shaped periscope structure, making full use of space for imaging. The fewer lenses used reduce the overall height, and the back focal length is folded inside the prism G5, shortening the lens's back focal length and reducing the camera's height. Through the reasonable allocation of the optical power, spacing, and refractive index of each lens, and the configuration of the prism G5, the mobile phone camera has the advantages of a large aperture, small size, and long focal length, making it suitable for foldable phones. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A front structural diagram of the lens folding optical path of a miniaturized telephoto periscope mobile phone camera according to an embodiment of this application is shown.

[0018] Figure 2 This diagram illustrates the structure of a miniaturized telephoto periscope mobile phone camera with a folded optical path according to an embodiment of this application.

[0019] Figure 3 A front structural diagram of the lens folding optical path of a miniaturized telephoto periscope mobile phone camera according to Embodiment 1 of this application is shown.

[0020] Figures 4 to 9 The MTF curve, relative illumination and Y field of view, field curvature diagram, distortion diagram, light fan diagram and vertical axis chromatic aberration diagram of the miniaturized telephoto periscope mobile phone camera of Example 1 are shown respectively. Detailed Implementation

[0021] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the preferred embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by this utility model to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit this utility model; some well-known parts may not be shown. In the various drawings, the same elements are represented by similar reference numerals. For clarity, the various parts in the drawings are not necessarily drawn strictly to scale.

[0022] It is important to understand that the terms "first," "second," "third," etc., are used merely to distinguish elements or circuits with similar properties, and do not indicate or imply relative importance or a specific order. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the listed elements but also other elements not expressly listed.

[0023] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shape of the sphere shown in the drawings is illustrated by way of example. That is, the shape of the sphere is not limited to that shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0024] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object plane of the lens, and the surface of each lens closest to the image plane is called the image plane of the lens.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] The features, principles and other aspects of this application are described in detail below.

[0027] like Figure 1 and Figure 2As shown, the miniaturized telephoto periscope mobile phone camera according to an exemplary embodiment of this application includes, in order from object to image, a first lens G1, a second lens P2, a third lens P3, a prism G5, and an image plane IMG. The first lens G1 has positive optical power; the second lens P2 has negative optical power; the third lens P3 has positive optical power; the prism G5 has an incident surface, a first reflecting surface, a total reflection surface, a second reflecting surface, and an exit surface. The prism G5 is placed at the rear end of the third lens P3. Light rays pass through the third lens P3 and enter the prism G5 along the first optical axis through the incident surface. After being reflected by the first reflecting surface, the light rays enter the total reflection surface along the second optical axis. After total reflection by the total reflection surface, the light rays enter the second reflecting surface along the third optical axis. After being reflected by the second reflecting surface, the light rays exit the exit surface along the fourth optical axis and are projected onto the image plane IMG for imaging. Therefore, this utility model can make full use of space for imaging using only an L-shaped periscope architecture formed by three lenses and one prism. The use of fewer lenses reduces the overall height, and the back focal length is folded inside the prism G5, shortening the back focal length of the lens and reducing the height of the camera. Through the reasonable allocation of the optical power, spacing and refractive index of each lens and the configuration of the prism G5, the mobile phone camera can have the advantages of large aperture, small size and long focal length. It can be used to realize a 125mm equivalent focal length high-definition telephoto lens, achieve a large F2.6 aperture and miniaturization, and can be adapted to foldable phones.

[0028] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application has an angle between the first optical axis and the second optical axis between 0° and 90°, an angle between the second optical axis and the third optical axis between 90° and 180°, an angle between the third optical axis and the fourth optical axis between 0° and 90°, the first optical axis and the fourth optical axis being parallel to each other, and the incident surface, the total reflection surface and the exit surface being a common plane.

[0029] In one exemplary embodiment, according to the miniaturized telephoto periscope mobile phone camera of this application, the prism G5 is a trapezoidal prism, the incident surface, the total reflection surface and the exit surface of the prism G5 are located on the same base of the trapezoidal prism, and the first reflection surface and the second reflection surface of the prism G5 are located on the two waists of the trapezoidal prism.

[0030] In an exemplary embodiment, according to the miniaturized telephoto periscope mobile phone camera of this application, the first lens G1 can be spherical or aspherical, and the material can be glass or plastic. In an exemplary embodiment, according to the miniaturized telephoto periscope mobile phone camera of this application, the second lens P2 and the third lens P3 can be aspherical, and the material can be plastic. In one exemplary embodiment, the second lens P2 is a biconcave lens, and / or the third lens P3 is a biconvex lens. In an exemplary embodiment, according to the miniaturized telephoto periscope mobile phone camera of this application, the prism G5 can be made of glass-plastic composite or plastic.

[0031] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application has one or more of the first reflective surface, the total reflection surface, and the second reflective surface coated with a reflective film. The reflective film can be a metal film or a dielectric film, which can ensure that light can be completely reflected and reduce the risk of light being refracted out of the prism G5.

[0032] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application satisfies CT1+CT2+CT3+T1+T2<9mm; wherein, the center thickness of the first lens G1 is CT1, the center thickness of the second lens P2 is CT2, the center thickness of the third lens P3 is CT3, the spatial gap between the first lens G1 and the second lens P2 is T1, and the spatial gap between the second lens P2 and the third lens P3 is T2. Satisfying CT1+CT2+CT3+T1+T2<3.3mm, by controlling the center thicknesses CT1-CT3 of the first lens G1 to the third lens P3 and the air gaps T1-T2 between the lenses, miniaturization of the mobile phone camera is facilitated.

[0033] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application satisfies 0.35mm < T4 < 0.65mm; wherein, the air gap between the third lens P3 and the prism G5 is T4. Satisfying 0.35mm < T4 < 0.65mm, by controlling the air gap T4 between the third lens P3 and the prism G5, is beneficial to achieving miniaturization of the mobile phone camera.

[0034] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application satisfies 0.7 < f / BFL < 1.1; wherein, the effective focal length of the miniaturized telephoto periscope mobile phone camera is f, and the distance from the image plane of the third lens P3 to the image plane IMG is BFL. Satisfying 0.7 < f / BFL < 1.1 means that by controlling the effective focal length f of the miniaturized telephoto periscope mobile phone camera and the distance BFL from the image plane of the third lens P3 to the image plane IMG, if the value of f / BFL is less than the lower limit, astigmatism, distortion, etc., may occur; if the value of f / BFL is greater than the upper limit, it may lead to insufficient lens resolution, affecting image quality; and a suitable value of f / BFL can be used to achieve excellent image quality from object distances from 30cm to infinity.

[0035] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application satisfies 2 < ((f / f1) + (f / f3)) < 5; wherein, the effective focal length of the miniaturized telephoto periscope mobile phone camera is f, the effective focal length of the first lens G1 is f1, and the effective focal length of the third lens P3 is f3. By satisfying 2 < ((f / f1) + (f / f3)) < 5, and by controlling the effective focal length f of the miniaturized telephoto periscope mobile phone camera, the effective focal length f1 of the first lens G1, and the effective focal length f3 of the third lens P3, suitable focal lengths and depths of field can be obtained, avoiding astigmatism, distortion, and chromatic aberration, and enabling excellent imaging quality from object distances from 30cm to infinity.

[0036] In an exemplary implementation, reference may be made to Figure 1 According to this application, the miniaturized telephoto periscope mobile phone camera satisfies 11mm < CT5 < 14mm; wherein, the equivalent prism thickness CT5 of the prism G5 before folding the optical path satisfies 11mm < CT5 < 14mm. By controlling the equivalent prism thickness CT5 of the prism G5, the optical path length of light inside the prism G5 can be adjusted, allowing the light to be correctly focused on the image plane IMG, thereby improving image quality.

[0037] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application satisfies 3mm < CT6 < 4mm; wherein, the thickness of the prism G5 after folding the optical path is CT6. Satisfying 3mm < CT6 < 4mm, by controlling the thickness CT6 of the prism G5 after folding the optical path, is beneficial to achieving miniaturization of the mobile phone camera.

[0038] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application can meet the following requirements.

[0039] 1.55≤n1≤1.98, and 45≤V1≤90; where the refractive index of the first lens G1 is n1, and the dispersion coefficient of the first lens G1 is V1. By satisfying 1.55≤n1≤1.98 and 45≤V1≤90, the chromatic aberration of the first lens G1 can be controlled through its refractive index n1 and dispersion coefficient V1, reducing the burden of chromatic aberration correction on other lenses and leaving room for correction of other aberrations.

[0040] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application satisfies 1 < (DT11 + DT21) / (DT12 / DT22) < 1.5; wherein, the maximum effective object-side diameter of the first lens G1 is DT11, the maximum effective image-side diameter of the first lens G1 is DT12, the maximum effective object-side diameter of the second lens P2 is DT21, and the maximum effective image-side diameter of the second lens P2 is DT22. By satisfying 1 < (DT11 + DT21) / (DT12 / DT22) < 1.5, and by controlling the maximum effective object-side diameter DT11, the maximum effective image-side diameter DT12 of the first lens G1, the maximum effective object-side diameter DT21, and the maximum effective image-side diameter DT22 of the second lens P2, a balance between increasing light intake and reducing aberrations can be achieved, thereby improving image quality.

[0041] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application satisfies 31° < A < 35°; wherein, the angle between the incident surface of the prism after folding the optical path and the first reflecting surface is A. Satisfying 31° < A < 35°, by controlling the angle A between the incident surface of the prism after folding the optical path and the first reflecting surface, and thereby controlling the thickness CT6 of the prism G5 after folding the optical path, is beneficial to achieving miniaturization of the mobile phone camera.

[0042] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera of this application allows for adjusting the spacing between the first lens G1, the second lens P2, the third lens P3, and the prism G5 to form different object distances, achieving excellent imaging quality from 30cm to infinity. For example, when the lens's mechanical back focus satisfies the infinity object distance, the depth of field is 0.95m to infinity, suitable for shooting at infinity; when the lens's mechanical back focus satisfies the macro object distance, the depth of field is 0.35m to infinity, suitable for macro object distance shooting such as 30cm.

[0043] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera of this application can be fitted with a 1 / 2.8” chip on the image plane. The chip body height is only 2.8mm. Combined with the ultra-short lens body length of the mobile phone camera, miniaturization is achieved. Therefore, the miniaturized telephoto periscope mobile phone camera of this application can be extremely well adapted to foldable phones and is an important telephoto architecture for foldable phones.

[0044] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera of this application can be adapted to all chip sizes below 1 / 1.56” on the image plane, and 3x optical zoom can be achieved through the lens architecture of the miniaturized telephoto periscope mobile phone camera of this application.

[0045] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application can be fitted with a 1 / 2” chip on the image plane, so the height of the lens body can be less than 6.1mm and the shoulder height is less than 5.3mm, making full use of the space of the mobile phone back cover decorative parts and realizing miniaturization.

[0046] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application further includes an aperture stop STO, which is disposed between the first lens G1 and the second lens P2 to further improve overall performance. In other exemplary embodiments, the aperture stop STO may be disposed between other lenses.

[0047] In an exemplary embodiment, the miniaturized telephoto periscope mobile phone camera according to this application further includes a color filter IR for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the image plane IMG. In one exemplary embodiment, the color filter IR and / or the protective glass may be disposed between the image plane IMG and the prism G5.

[0048] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although three lenses are described as an example in the embodiments, the optical imaging lens is not limited to including three lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0049] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of a miniaturized telephoto periscope mobile phone camera applicable to the above-described embodiments.

[0050] Example 1

[0051] The following is for reference Figure 3 This application describes a miniaturized telephoto periscope mobile phone camera according to Embodiment 1 of this application. Figure 3 This diagram illustrates the front structure of the lens-folded optical path of a miniaturized telephoto periscope mobile phone camera according to Embodiment 1 of this application. Figure 3 As shown, this miniaturized telephoto periscope mobile phone camera, in order from the object side to the image side, includes a first lens G1, an aperture STO, a second lens P2, a third lens P3, a prism G5, a filter IR, and an image plane IMG. Furthermore, the first lens G1, the second lens P2, the third lens P3, the prism G5, and the filter IR each include an object-side plane facing the object side and allowing imaging light to pass through, and an image-side plane facing the image side and allowing imaging light to pass through.

[0052] Please refer to the following as well. Figure 3According to Table 1, the first lens G1 has positive optical power, with its object surface G1R1 being convex and its image surface G1R2 being concave. The second lens P2 has negative optical power, with its object surface P2R1 being concave and its image surface P2R2 being concave. The third lens P3 has positive optical power, with its object surface P3R1 being convex and its image surface P3R2 being convex. The prism G5 has an object surface G5R1 and an image surface G5R2. The filter IR has an object surface IRR1 and an image surface IRR2. Light from the object passes sequentially through the first lens G1, the aperture STO, the second lens P2, the third lens P3, the prism G5, and the filter IR, and is finally imaged on the image plane IMG.

[0053] Table 1 shows the basic parameters of the miniaturized telephoto periscope mobile phone camera of Embodiment 1, where the units for radius of curvature, thickness, focal length and aperture are all millimeters (mm).

[0054] Table 1:

[0055]

[0056] In Embodiment 1, the object and image surfaces of the first lens G1 can both be standard surfaces, and the object and image surfaces of the second lens P2 and the third lens P3 can both be extended aspherical surfaces. The surface shape of each extended aspherical surface can be limited by, but is not limited to, the following aspherical formula:

[0057] (1)

[0058] Where x is the distance vector from the vertex of the extended aspherical surface at a height h along the optical axis; c is the paraxial curvature of the extended aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the extended aspherical surface. Table 2 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of the extended aspherical mirror surface that can be used in the object and image aspects of the second lens P2 and the third lens P3 in Embodiment 1.

[0059] Table 2:

[0060]

[0061] In this embodiment, by rationally allocating the optical power distribution, spacing, and refractive index of the first lens G1 to the third lens P3 in the table above, a telephoto lens with a long focal length, large aperture, and miniaturization can be achieved. Specifically, the miniaturized telephoto periscope mobile phone camera has a focal length of 11.25mm, an operating wavelength of 430-650nm, an aperture of 2.65, an imaging circle diameter of 6.8mm, a field of view of 31.5°, and a total optical length of 16.8mm. The relationship between the center thickness CT1 of the first lens G1, the center thickness CT2 of the second lens P2, the center thickness CT3 of the third lens P3, the spatial gap T1 between the first lens G1 and the second lens P2, and the spatial gap T2 between the second lens P2 and the third lens P3 is CT1 + CT2 + CT3 + T1 + T2 = 2.21 mm, satisfying CT1 + CT2 + CT3 + T1 + T2 < 2.9 mm. The air gap T4 between the third lens P3 and the prism G5 is T3 = 0.633 mm, satisfying 0.35 mm < T4 < 0.65 mm. The relationship between the effective focal length f of the miniaturized telephoto periscope mobile phone camera and the distance BFL from the image plane to the image plane of the third lens P3 can be f / BFL = 0.8, satisfying 0.7 < f / BFL < 1.1. The effective focal length of the miniaturized telephoto periscope mobile phone camera is f=11.25mm. The effective focal length of the first lens G1 is f1=5.4mm, and the effective focal length of the third lens P3 is f3=4.4mm. Therefore, ((f / f1)+(f / f3))=4.64, which satisfies: 2<((f / f1)+(f / f3))<5. The equivalent prism thickness CT5 of the prism before folding the optical path is CT5=12.59mm, which satisfies: 11mm<CT5<14mm. The thickness CT6 of the prism after folding the optical path satisfies: 3mm<CT6<4mm. The relationship between the maximum effective object-side diameter DT11 and the maximum effective image-side diameter DT12 of the first lens G1, and the maximum effective object-side diameter DT21 and the maximum effective image-side diameter DT22 of the second lens P2, is (DT11+DT21) / (DT12 / DT22)=1.11, satisfying: 1<(DT11+DT21) / (DT12 / DT22)<1.5. The total length L1 of the prism after folding the optical path satisfies: 11mm<L1<14mm. The angle A between the incident surface and the first reflecting surface of the prism after folding the optical path can be A=33°, satisfying: 31°<A<35°.

[0062] Figure 4The MTF curve of the miniaturized telephoto periscope mobile phone camera of Embodiment 1 is shown. The MTF (Modulation Transfer Function) curve shows the transmission of image details (i.e. image contrast) at different spatial frequencies by the imaging system. At a spatial frequency of 250 lp / mm, the OTF modulus is greater than 0.2, indicating good resolution. Figure 5 The relative illumination and Y-field diagram of the miniaturized telephoto periscope mobile phone camera of Embodiment 1 are shown. The relative illumination is greater than 75%, and the image brightness is uniform. Figure 6 The field curvature diagram of the miniaturized telephoto periscope mobile phone camera of Example 1 is shown. The field curvature is less than ±0.10mm, indicating good correction. Figure 7 The distortion diagram of the miniaturized telephoto periscope mobile phone camera of Example 1 is shown. The distortion is less than 1.0%, and the correction is very good. Figure 8 The light field diagram of the miniaturized telephoto periscope mobile phone camera of Example 1 is shown, with a scale of ±20μm, and the imaging magnification error values ​​are all within an acceptable range. Figure 9 The diagram shows the chromatic aberration of the miniaturized telephoto periscope mobile phone camera of Example 1. In the example, at a maximum field of view of 10.300Deg, the focal deviation of different wavelengths of light formed on the imaging plane along a direction perpendicular to the optical axis is within 0.4μm, indicating good color reproduction. According to... Figures 4 to 9 As can be seen, the miniaturized telephoto periscope mobile phone camera given in Example 1 has excellent resolution, uniform image brightness, good calibration, small imaging error and good color reproduction, and can achieve good image quality.

[0063] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A miniaturized long-focus periscope camera, characterized in that, The sequence from the object side to the image side comprises a first lens, a second lens, a third lens, a prism and an image plane in sequence; the first lens has positive refractive power; the second lens has negative refractive power; the third lens has positive refractive power; the prism has an entrance surface, a first reflection surface, a total reflection surface, a second reflection surface and an exit surface; The prism is arranged at the rear end of the third lens, light rays pass through the entrance surface of the prism along a first optical axis direction after passing through the third lens, are reflected by the first reflection surface, are incident on the total reflection surface along a second optical axis direction, are totally reflected by the total reflection surface, are incident on the second reflection surface along a third optical axis direction, are reflected by the second reflection surface, and are emitted from the exit surface along a fourth optical axis direction to form an image on the image plane.

2. The compact tele periscope camera of claim 1, wherein, The included angle between the first optical axis and the second optical axis is between 0° and 90°, the included angle between the second optical axis and the third optical axis is between 90° and 180°, the included angle between the third optical axis and the fourth optical axis is between 0° and 90°, the first optical axis and the fourth optical axis are parallel to each other, and the entrance surface, the total reflection surface and the exit surface are common planes.

3. The compact tele periscope camera of claim 1, wherein, The center thickness CT1 of the first lens, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens, the spatial gap T1 between the first lens and the second lens, and the spatial gap T2 between the second lens and the third lens satisfy: CT1+CT2+CT3+T1+T2<2.9mm.

4. The compact tele periscope camera of claim 1, wherein, The air gap T4 between the third lens and the prism satisfies: 0.35mm<T4<0.65mm.

5. The compact tele periscope camera of claim 1, wherein, The effective focal length f of the miniaturized long-focus periscope camera, and the distance BFL from the image plane of the third lens to the image plane satisfy: 0.7<f / BFL<1.

1.

6. The compact tele periscope camera of claim 1, wherein, The effective focal length f of the miniaturized long-focus periscope camera, the effective focal length f1 of the first lens, and the effective focal length f3 of the third lens satisfy: 2<((f / f1)+(f / f3))<5.

7. The compact tele periscope camera of claim 1, wherein, The equivalent prism thickness CT5 of the prism before the folded light path satisfies: 11mm<CT5<14mm.

8. The compact tele periscope camera of claim 1, wherein, The thickness CT6 of the prism after the folded light path satisfies: 3mm<CT6<4mm.

9. The compact tele periscope camera of claim 1, wherein, The object side maximum effective diameter DT11 of the first lens, the image side maximum effective diameter DT12 of the first lens, the object side maximum effective diameter DT21 of the second lens, and the image side maximum effective diameter DT22 of the second lens satisfy: 1<(DT11+DT21) / (DT12 / DT22)<1.

5.

10. The compact tele periscope camera of claim 1, wherein, The angle A between the entrance surface and the first reflection surface of the prism after the folded light path satisfies: 31°<A<35°.

Images