Super-long-focus periscopic camera module

Abstract

The invention discloses an ultra-long-focus periscopic camera module. The ultra-long-focus periscopic camera module comprises a first prism, a first lens assembly, a second lens assembly, a second prism, a third prism and an imaging assembly, the first prism comprises a first incident surface, a first reflecting surface and a first emergent surface; the first lens assembly comprises at least one lens, and each lens is arranged on the object space side and / or the image space side of the first prism; the second lens assembly comprises at least one lens, and the second lens assembly moves in the direction of the second optical axis to perform focusing and also moves in the direction perpendicular to the second optical axis to realize an OIS anti-shake effect; the second prism comprises a second incident surface, a second reflecting surface, a third reflecting surface and a second emergent surface; the second incident surface is opposite to the emergent surface of the second lens assembly; and the third prism comprises a third incident plane, a fourth reflecting plane, a fifth reflecting plane and a third emergent plane, and the third incident plane and the second emergent plane are arranged in parallel. According to the invention, the miniaturization of the ultra-long focal periscopic camera module can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, in particular to a super long-focus periscope camera module. BACKGROUND

[0002] In recent years, the development of mobile phone cameras is constantly accelerating, and consumers' requirements for mobile phone photography are also increasing. Among them, the long-focus periscope camera module, as a functional module that can realize long-distance shooting and optical zoom, occupies a dominant position in the camera module of smartphones.

[0003] However, in order to shoot far and well, the long-focus camera must have high focal length, large sensor, and large aperture, which requires the volume of the long-focus lens module to increase continuously, causing the size, macro, and zoom ratio to pull each other, so that the performance and size cannot be compromised, and it is difficult to realize the miniaturization of the long-focus camera module. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide a super long-focus periscope camera module, which is provided with multiple prisms to fold the optical path and increase the optical path, thereby realizing the miniaturization of the module.

[0005] The present application provides a super long-focus periscope camera module, which comprises a first prism, a first lens assembly, a second lens assembly, a second prism, a third prism, and an imaging assembly; the first prism comprises a first incident surface, a first reflecting surface, and a first exit surface; light rays enter the first incident surface along the first optical axis direction, are reflected by the first reflecting surface, and then the optical axis direction changes to the second optical axis direction, and the light rays exit from the first exit surface; the first lens assembly comprises at least one lens, and each lens of the first lens assembly is arranged on the object side and / or the image side of the first prism; the second lens assembly comprises at least one lens, and the second lens assembly moves in the second optical axis direction to focus between infinity and macro; and the second lens assembly moves in a direction perpendicular to the second optical axis direction to achieve OIS anti-shake effect; the second prism comprises a second incident surface, a second reflecting surface, a third reflecting surface, and a second exit surface, and the second incident surface is arranged opposite to the light exit surface of the second lens assembly; when the light rays pass through the second prism, they enter the second incident surface along the second optical axis direction, and then are reflected at least once in turn by the second reflecting surface and the third reflecting surface, and then exit from the second exit surface; the third prism comprises a third incident surface, a fourth reflecting surface, a fifth reflecting surface, and a third exit surface, and the third incident surface is arranged parallel to the second exit surface; when the light rays pass through the third prism, they enter the third incident surface, and then are reflected at least once in turn by the fourth reflecting surface and the fifth reflecting surface, and then exit from the third exit surface to the imaging surface of the imaging assembly.

[0006] Optionally, the second exit surface of the second prism and the third incident surface of the third prism are fixedly bonded to each other or are spaced apart to form an air gap, a thickness CTa of the air gap satisfying: CTa>0.01mm.

[0007] Optionally, an angle between the first optical axis direction and the second optical axis direction is 90°.

[0008] Optionally, the second reflection surface and the second exit surface are different regions of the same plane.

[0009] Optionally, the third incident surface and the third exit surface are arranged in parallel to each other, and the fourth reflection surface and the fifth reflection surface are arranged in parallel to each other.

[0010] Optionally, a total height HZ1 of the super-tele camera module and a shoulder height HZ2 of the super-tele camera module satisfy: HZ1<0.4EFL, HZ2<0.3EFL, where EFL is an effective focal length of the super-tele camera module.

[0011] Optionally, an exit optical axis direction of light rays passing through the second prism is perpendicular to the second exit surface, and an exit optical axis direction of light rays passing through the third prism is perpendicular to the third exit surface.

[0012] Optionally, the second reflection surface is arranged to satisfy total reflection conditions when light rays are reflected thereon, and the third reflection surface, the fourth reflection surface, and the fifth reflection surface are coated with a reflection film for specular reflection.

[0013] Optionally, light rays undergo two reflections when passing through the second prism and the third prism, respectively, so that optical axis directions change in sequence as the second optical axis direction, the third optical axis direction, the fourth optical axis direction, the fifth optical axis direction, and the sixth optical axis direction; an angle θ1 between the second optical axis direction and the third optical axis direction satisfies 100°<θ1<140°; an angle θ2 between the third optical axis direction and the fourth optical axis direction satisfies 50°<θ2<70°; an angle θ3 between the fourth optical axis direction and the fifth optical axis direction satisfies 40°<θ3<80°; and an angle θ4 between the fifth optical axis direction and the sixth optical axis direction satisfies 40°<θ4<80°.

[0014] Optionally, an angle θ5 between the first optical axis direction and the imaging surface satisfies 140°<θ5<160°.

[0015] Optionally, the first prism is an isosceles right prism.

[0016] Optionally, the second incidence surface and the third reflection surface form an angle of 90°, and the second incidence surface and the second reflection surface form an angle greater than the angle between the third reflection surface and the second reflection surface.

[0017] Optionally, the third prism further comprises an auxiliary surface, which is arranged perpendicularly opposite to the fifth reflection surface.

[0018] Optionally, the first prism and the second prism are right-angled triangular prisms, and the third prism is a pentagonal prism, wherein the angle α between the third reflection surface of the second prism and the second exit surface satisfies 20°<α<40°.

[0019] Optionally, the angle β between the third incidence surface and the fourth reflection surface of the third prism satisfies 20°<β<40°; preferably, β=α.

[0020] Optionally, the total height HZ1 of the super-telephoto periscope camera module and the working F number F.No of the super-telephoto periscope camera module satisfy: 0.1<F.No / HZ1<0.4.

[0021] Optionally, the lens closest to the object side in the first lens assembly is a first lens, and the focal length f1 of the first lens satisfies: 2<f / f1<4, and f1>0, wherein f represents the system focal length of the super-telephoto periscope camera module.

[0022] Optionally, the lens closest to the object side in the first lens assembly is a first lens, and the refractive index n1 and the Abbe number V1 of the first lens satisfy: 1.55≤n1≤1.1.98; 45≤V1≤90.

[0023] Optionally, the distance HY1 from the second incidence surface of the second prism to the upper end point of the imaging surface satisfies: HY1<0.7*EFL, wherein EFL represents the effective focal length of the super-telephoto periscope camera module.

[0024] Optionally, the focusing stroke Saf of the second lens assembly moving along the second optical axis direction to complete the focusing work satisfies: 0.4DOF<Saf<0.9DOF, wherein DOF represents the depth of field of the super-telephoto periscope camera module.

[0025] Optionally, the thickness DTP3 of the second prism satisfies: 0.1EFL<DTP3<0.3EFL, and the thickness DTP4 of the third prism satisfies: 0.1EFL<DTP4<0.3EFL, wherein EFL represents the effective focal length of the super-telephoto periscope camera module.

[0026] The application provides an ultra-long-focus periscope camera module, which comprises a first prism, a first lens assembly, a second lens assembly, a second prism, a third prism and an imaging assembly. The spatial requirement of the camera module is converted by folding the light path through the first prism, for example, the light path is folded by 90° to form an L-shaped light path, the original longitudinal spatial requirement of the camera module is converted into a transverse spatial requirement, which helps to reduce the overall height of the module. The light path is folded by multiple light path reflections through the second prism and the third prism, which can reduce the transverse spatial requirement and realize the miniaturization of the module. The second lens assembly moves along the second optical axis direction for focusing AF, which can realize excellent imaging quality in the near focus (for example, 20cm or 120cm) and infinity range, and can also move in the direction perpendicular to the second optical axis to realize OIS anti-shake effect. In addition, the lens grouping of the first lens assembly and the second lens assembly can make the stroke of AF&OIS be 50%-80% of the conventional focusing stroke, so as to meet the requirement of reducing the height and be beneficial to the miniaturization of the camera module. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 A front part structure schematic diagram of the folded light path of the ultra-long-focus periscope camera module according to an embodiment of the application is shown.

[0029] Figure 2 A rear part structure schematic diagram of the folded light path of the ultra-long-focus periscope camera module according to an embodiment of the application is shown.

[0030] Figure 3 A size schematic diagram of the folded light path of the ultra-long-focus periscope camera module according to an embodiment of the application is shown.

[0031] Figure 4 A front structure schematic diagram of the folded light path of the ultra-long-focus periscope camera module according to embodiment 1 of the application is shown.

[0032] Figures 5 to 10 A far focus state MTF curve diagram, an MTF defocus curve diagram, a light fan diagram, a field curvature and distortion diagram, a vertical axis chromatic aberration diagram and a relative luminance and actual chief ray image height diagram of the ultra-long-focus periscope camera module of embodiment 1 are respectively shown.

[0033] Figure 11A folding light path front structure schematic diagram of the super telephoto periscope camera module according to Embodiment 2 of the present application is shown.

[0034] Figures 12 to 16 A far focus state MTF curve diagram, an MTF defocus curve diagram, a light fan diagram, a field curvature and distortion diagram, and a relative luminance and actual chief ray image height diagram of the super telephoto periscope camera module of Embodiment 2 are shown respectively. DETAILED DESCRIPTION

[0035] The foregoing and other technical contents, features and effects of the present application will be apparent from the following detailed description of the preferred embodiments of the present application, with reference to the accompanying drawings. Through the description of the specific embodiments, the technical means and effects taken by the present application to achieve the intended purposes can be understood more deeply and specifically. However, the accompanying drawings are provided for reference and illustration only, and are not intended to limit the present application, and some known parts can not be shown. In each of the drawings, like elements are denoted by like reference numerals. For the sake of clarity, each part in the drawings is not necessarily drawn strictly to scale.

[0036] It should be understood that the terms "first", "second", "third", and "fourth" and the like are merely intended to distinguish similar elements or circuits from each other, and do not indicate or imply relative importance or a particular order. The terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to the listed elements, other elements not explicitly listed can also be included.

[0037] In the drawings, the thickness, size and shape of the lens have been slightly exaggerated for ease of illustration. Specifically, the shape of the sphere shown in the drawings is shown by way of example. That is, the shape of the sphere is not limited to the shape of the sphere shown in the drawings. The drawings are merely examples and are not drawn strictly to scale.

[0038] In this document, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface 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 object is called the object side surface of the lens, and the surface of each lens closest to the image surface is called the image side surface of the lens.

[0039] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0040] The features, principles and other aspects of the present application are described in detail below.

[0041] Figure 1 A schematic diagram of the folded optical path front portion structure of an ultra-telephoto periscope camera module according to an embodiment of this application is shown. Figure 2 A schematic diagram of the rear portion of the folded optical path of an ultra-telephoto periscope camera module according to an embodiment of this application is shown. Figure 3 A schematic diagram showing the dimensions of an ultra-telephoto periscope camera module after folding the optical path according to an embodiment of this application is provided.

[0042] According to an exemplary embodiment of the present application, the ultra-long telephoto periscope camera module includes a first prism 10. Figure 1 and Figure 2 Not shown, please refer to Figure 3 The system comprises a first lens assembly 20, a second lens assembly 30, a second prism 40, a third prism 50, and an imaging assembly; the first prism 10 includes a first incident surface, a first reflecting surface, and a first exiting surface; the light rays follow the first optical axis direction o1 ( Figure 1 and Figure 2 Not shown, please refer to Figure 3 The light ray enters from the first incident surface, is reflected by the first reflecting surface, and then the optical axis direction changes to the second optical axis direction o2. The light ray exits from the first exit surface. The first lens assembly 20 includes at least one lens, and each lens of the first lens assembly 20 is disposed on the object side and / or image side of the first prism 10; the second lens assembly 30 includes at least one lens, and the second lens assembly 30 is disposed on the second optical axis direction o2 ( Figure 1 and Figure 2 Not shown, please refer to Figure 3 The device moves to focus from infinity to macro, and also moves perpendicular to the second optical axis to achieve OIS image stabilization. The second prism 40 includes a second incident surface, a second reflecting surface, a third reflecting surface, and a second exiting surface. The second incident surface is disposed opposite to the light-emitting surface of the second lens assembly 30. When light passes through the second prism 40, it enters from the second incident surface along the second optical axis direction o2, and is reflected at least once by the second reflecting surface and the third reflecting surface in sequence, before exiting through the second exiting surface. The third prism 50 includes a third incident surface, a fourth reflecting surface, a fifth reflecting surface, and a third exiting surface. The third incident surface and the second exiting surface are arranged parallel to each other. When light passes through the third prism 50, it enters through the third incident surface and is reflected at least once by the fourth and fifth reflecting surfaces in sequence before exiting through the third exiting surface to the imaging surface IMG of the imaging component.

[0043] In an exemplary embodiment, according to the ultra-long telephoto periscope camera module of this application, the second exit surface of the second prism 40 and the third incident surface of the third prism 50 are glued and fixed together, or spaced apart to form an air gap, the thickness CTa of which satisfies: CTa > 0.01 mm. By controlling the size range of the thickness CTa of the air gap, optical performance can be guaranteed, direct collision between the second exit surface of the second prism 40 and the third incident surface of the third prism 50 can be avoided, and allowances can be made for processing and thermal expansion.

[0044] In an exemplary embodiment, the ultra-long telephoto periscope camera module according to this application has an angle of 90° between the first optical axis direction o1 and the second optical axis direction o2. Thus, by folding the optical path 90° through the first prism 10, an L-shaped optical path bend is formed, transforming the original vertical space requirement of the camera module into a horizontal space requirement, which helps to reduce the overall height of the module.

[0045] In an exemplary embodiment, the ultra-telephoto periscope camera module according to this application has a second reflective surface and a second emitting surface that are different regions of the same plane, which can improve the system compactness and help to miniaturize the camera module.

[0046] In an exemplary embodiment, the ultra-long telephoto periscope camera module according to this application has a third incident surface and a third exiting surface arranged parallel to each other, and a fourth reflecting surface and a fifth reflecting surface arranged parallel to each other. This facilitates multiple reflections of light within the third prism 50 and ensures that the incident light rays entering the third prism 50 and the exiting light rays exiting the third prism 50 are parallel in direction, resulting only in lateral displacement. This improves system compactness and contributes to the miniaturization of the camera module.

[0047] In an exemplary embodiment, according to the ultra-long telephoto periscope camera module of this application, all lenses of the first lens assembly 20 are disposed on the object side of the first prism 10; or, all lenses of the first lens assembly 20 are disposed on the image side of the first prism 10, for example... Figure 1 The first lens assembly 20 includes a first lens G11 (preferably made of glass) and a second lens P12 (preferably made of plastic), and both the first lens G11 and the second lens P12 are disposed on the image side of the first prism 10. For example... Figure 2 The first lens assembly 20 includes a first lens G21 and a second lens P22, and both the first lens G21 and the second lens P22 are disposed on the image side of the first prism 10. For example... Figure 3The first lens assembly 20 in the first embodiment includes the first lens G31 and the second lens P32, and both the first lens G31 and the second lens P32 are arranged on the image side of the first prism 10; or at least one lens of the first lens assembly 20 is arranged on the object side of the first prism 10, and all the remaining lenses are arranged on the image side of the first prism 10, for example Figure 4 The first lens assembly 20 in the second embodiment includes the first lens G41, the second lens P42 and the third lens P43, the first lens G41 is arranged on the object side of the first prism 10, and both the second lens P42 and the third lens P43 are arranged on the image side of the first prism 10, for example Figure 11 The first lens assembly 20 in the third embodiment includes the first lens G51, the second lens P52 and the third lens P53, the first lens G51 is arranged on the object side of the first prism 10, and both the second lens P52 and the third lens P53 are arranged on the image side of the first prism 10.

[0048] In the exemplary embodiments, the super-long-focus periscope camera module according to the present application, the second lens assembly 30 includes at least one lens, and the present application does not limit the specific number of lenses, for example, the second lens assembly 30 can include three lenses, for example Figure 1 The second lens assembly 30 in the first embodiment includes the third lens P13, the fourth lens P14 and the fifth lens P15, for example Figure 2 The second lens assembly 30 in the second embodiment includes the third lens P23, the fourth lens P24 and the fifth lens P25, for example Figure 3 The second lens assembly 30 in the third embodiment includes the third lens P33, the fourth lens P34 and the fifth lens P35; the second lens assembly 30 can include two lenses, for example Figure 4 The second lens assembly 30 in the fourth embodiment includes the fourth lens P44 and the fifth lens P45, for example Figure 5 The second lens assembly 30 in the fifth embodiment includes the fourth lens P54 and the fifth lens P55; and the like.

[0049] Specifically, the light rays of the object side pass through the first prism 10, the first lens assembly 20, the second lens assembly 30, the second prism 40 and the third prism 50, and are imaged on the imaging surface IMG of the imaging assembly; the first lens assembly 20 can be fixedly arranged relative to the first prism 10; wherein if all the lenses of the first lens assembly 20 are arranged on the object side of the first prism 10, the light rays can pass through all the lenses of the first lens assembly 20 and the first prism 10 in sequence; or if all the lenses of the first lens assembly 20 are arranged on the image side of the first prism 10, the light rays can pass through the first prism 10 and all the lenses of the first lens assembly 20 in sequence; or if at least one lens of the first lens assembly 20 is arranged on the object side of the first prism 10 and the remaining all the lenses are arranged on the image side of the first prism 10, the light rays can pass through the at least one lens of the first lens assembly 20, the first prism 10 and the remaining all the lenses of the first lens assembly 20 in sequence; after the light rays pass through the first prism 10 and the first lens assembly 20, they pass through the second lens assembly 30, the second prism 40 and the third prism 50 in sequence and are imaged on the imaging surface IMG of the imaging assembly.

[0050] Wherein, the first prism 10 is used to fold the light path, which converts the space requirement of the camera module, for example, the light path is folded by 90° to form an L-shaped light path, which converts the original longitudinal space requirement of the camera module into a transverse space requirement, which helps to reduce the total height of the module; the second prism 40 and the third prism 50 are used to reflect the light path multiple times, for example, the light rays are reflected at least once on the second reflection surface and the third reflection surface of the second prism 40, and are also reflected at least once on the fourth reflection surface and the fifth reflection surface of the third prism 50, which realizes light path folding and reduces the transverse space requirement, realizing the miniaturization of the module.

[0051] Wherein, the second lens assembly 30 moves along the second optical axis direction o2 for focusing AF, which can achieve excellent imaging quality in the near focus (for example, 20cm or 120cm) and infinity range, and can also move along the direction perpendicular to the second optical axis to achieve OIS anti-shake effect; and the lens grouping arrangement of the first lens assembly 20 and the second lens assembly 30 can make the AF&OIS stroke be 50%-80% of the conventional focusing stroke, so as to meet the requirement of reducing height, which is beneficial to the miniaturization of the camera module.

[0052] Thus, the super-long focal periscope camera module of the embodiment of the application can fold the light path by the multiple prisms arranged to increase the optical path, realizing the miniaturization of the super-long focal periscope camera module.

[0053] In an example embodiment, the ultra-long focal periscope camera module according to the present application satisfies: HZ1 < 0.4EFL, HZ2 < 0.3EFL; wherein EFL is the effective focal length of the ultra-long focal periscope camera module; HZ1 is the total height of the module, i.e., the maximum dimension in the thickness direction of the device, and optionally, the total height of the module HZ1 can be approximately equal to the thickness of the first prism 10 in the first optical axis direction o1; HZ2 is the shoulder height of the module, i.e., the dimension in the thickness direction of the device at the second prism 40 and the third prism 50, and optionally, the shoulder height of the module HZ2 can be approximately equal to the distance from the third reflecting surface of the second prism 40 to the lower endpoint of the imaging surface IMG. Satisfying HZ1 < 0.4EFL, HZ2 < 0.3EFL, by controlling the size of the total height of the module HZ1 and the shoulder height of the module HZ2 of the ultra-long focal periscope camera module, the size of the camera module is advantageously controlled, and miniaturization of the camera module is achieved.

[0054] In an example embodiment, the ultra-long focal periscope camera module according to the present application satisfies: the exiting optical axis direction of the light when passing through the second prism 40 is perpendicular to the second exiting surface, and the exiting optical axis direction of the light when passing through the third prism 50 is perpendicular to the third exiting surface, which can avoid introducing large aberrations by the large incidence angle of the edge light, thereby improving the imaging quality.

[0055] In an example embodiment, the ultra-long focal periscope camera module according to the present application is provided with the second reflecting surface that satisfies the total reflection condition when the light is reflected, and the third reflecting surface, the fourth reflecting surface, and the fifth reflecting surface are coated with a reflecting film for specular reflection.

[0056] In an example embodiment, as shown in Figure 3 the ultra-long focal periscope camera module according to the present application, when the light passes through the second prism 40, it is incident along the second optical axis direction o2 from the second incident surface, propagates to the second reflecting surface and is reflected, causing the light to turn along the third optical axis direction o3, and then propagates to the third reflecting surface and is reflected, causing the light to exit along the fourth optical axis direction o4 from the second exiting surface; when the light passes through the third prism 50, it is incident along the fourth optical axis direction o4 from the third incident surface, propagates to the fourth reflecting surface and is reflected, causing the light to turn along the fifth optical axis direction o5, and then propagates to the fifth reflecting surface and is reflected, causing the light to exit along the sixth optical axis direction o6 from the third exiting surface.

[0057] In an example embodiment, as shown in Figure 3As shown, according to the super-long-focus periscope camera module of the present application, the light rays undergo twice reflection when passing through the second prism 40 and the third prism 50, so that the light axis direction changes in turn are the second light axis direction o2, the third light axis direction o3, the fourth light axis direction o4, the fifth light axis direction o5 and the sixth light axis direction o6; the included angle θ1 between the second light axis direction o2 and the third light axis direction o3 satisfies 100°< θ1 < 140°; the included angle θ2 between the third light axis direction o3 and the fourth light axis direction o4 satisfies 50°< θ2 < 70°; the included angle θ3 between the fourth light axis direction o4 and the fifth light axis direction o5 satisfies 40°< θ3 < 80°; and the included angle θ4 between the fifth light axis direction o5 and the sixth light axis direction o6 satisfies 40°< θ4 < 80°. Through the above angle setting, the total reflection condition can be met when the second reflection surface reflects, and the mirror reflection of the third reflection surface, the fourth reflection surface and the fifth reflection surface can be used.

[0058] In an exemplary embodiment, as shown in Figure 3 As shown, according to the super-long-focus periscope camera module of the present application, the included angle θ5 between the first light axis direction o1 and the imaging surface IMG satisfies 140°< θ5 < 160°.

[0059] In an exemplary embodiment, according to the super-long-focus periscope camera module of the present application, the third reflection surface of the second prism 40 and the fifth reflection surface of the third prism 50 are arranged in parallel, so that the third reflection surface, the fourth reflection surface and the fifth reflection surface are arranged in parallel to each other, which can better control the light axis direction of the light rays in the third prism 50, for example Figure 3 In the above, the fifth light axis direction o5 can be parallel to the third light axis direction o3, and the sixth light axis direction o6 can be parallel to the fourth light axis direction o4.

[0060] In an exemplary embodiment, as shown in Figure 3 As shown, according to the super-long-focus periscope camera module of the present application, the first prism 10 is an isosceles right prism. The light path is turned by 90° through the first prism 10, forming an L-shaped light path turning, converting the original longitudinal space requirement of the camera module into a transverse space requirement, which helps to reduce the total height of the module.

[0061] In an exemplary embodiment, as shown in Figure 3 As shown, according to the super-long-focus periscope camera module of the present application, the included angle between the second incidence surface and the third reflection surface is 90°, and the included angle between the second incidence surface and the second reflection surface is greater than the included angle between the third reflection surface and the second reflection surface. When the light rays undergo multiple reflections in the second prism 40, they are folded back and extend forward horizontally, so that the second reflection surface and the second exit surface are different regions, and the light rays can exit the second prism 40 at the second exit surface; wherein the included angle between the second incidence surface and the third reflection surface is 90°, which also helps positioning and assembly.

[0062] In an example embodiment, as shown in FIG. 1, the super-telephoto periscope camera module according to the present application comprises a first prism 10, a second prism 40, a third prism 50, and a lens assembly 20. Figure 3 As shown in FIG. 1, the third prism 50 according to the present application further comprises an auxiliary surface, which is arranged perpendicularly to the fifth reflecting surface, which can help positioning and assembly, and the arrangement of the auxiliary surface can reduce the lateral length of the third prism 50, which is helpful for miniaturization of the camera module.

[0063] In an example embodiment, as shown in FIG. 1, the super-telephoto periscope camera module according to the present application comprises a first prism 10, a second prism 40, a third prism 50, and a lens assembly 20. Figure 3 As shown in FIG. 1, the first prism 10 and the second prism 40 are right-angled triangular prisms, and the third prism 50 is a pentagonal prism, wherein the second prism 40 is a small-angle right-angled triangular prism, and the included angle a between the third reflecting surface of the second prism 40 and the second exit surface satisfies 20°<a<40°. Preferably, the third prism 50 is a pentagonal prism, and the third prism 50 further comprises an auxiliary surface, which is arranged perpendicularly to the fifth reflecting surface, then the five sides of the pentagonal prism of the third prism 50 can be in turn the third incident surface, the fourth reflecting surface, the third exit surface, the auxiliary surface, and the fifth reflecting surface. Preferably, the second prism 40 and the third prism 50 can complementarily form a long rectangular prism with a missing corner, which can help positioning and assembly.

[0064] In an example embodiment, as shown in FIG. 1, the super-telephoto periscope camera module according to the present application comprises a first prism 10, a second prism 40, a third prism 50, and a lens assembly 20. Figure 3 As shown in FIG. 1, the included angle β between the third incident surface and the fourth reflecting surface of the third prism 50 satisfies 20°<β<40°. Preferably, β=a.

[0065] In an example embodiment, the super-telephoto periscope camera module according to the present application satisfies: 0.1<F.No / HZ1<0.4; wherein F.No is the working F number of the super-telephoto periscope camera module, and HZ1 is the total height of the super-telephoto periscope camera module. Satisfying 0.1<F.No / HZ1<0.4, by controlling the ratio range of the working F number F.No of the super-telephoto periscope camera module and the total height HZ1 of the super-telephoto periscope camera module, it can be ensured that the lens assembly can receive a sufficient amount of light, which ensures the imaging quality of the camera module.

[0066] In an example embodiment, the super-telephoto periscope camera module according to the present application satisfies: 2<f / f1<4, and f1>0; wherein f1 is the focal length of the first lens, and f is the system focal length of the super-telephoto periscope camera module. Satisfying 2<f / f1<4, and f1>0, by controlling the ratio range of the system focal length f of the super-telephoto periscope camera module and the focal length f1 of the first lens, then the first lens has a larger optical power, which can converge light, and is conducive to realizing the system focal length of the camera module.

[0067] In the example embodiment, according to the super-telephoto periscope camera module of the present application, the lens closest to the object side in the first lens assembly 20 is the first lens, which satisfies: 1.55≤n1≤1.1.98; 45≤V1≤90; wherein n1 is the refractive index of the first lens, and V1 is the Abbe number of the first lens. Satisfying 1.55≤n1≤1.1.98; 45≤V1≤90, by controlling the size range of the refractive index n1 and the Abbe number V1 of the first lens, the chromatic aberration of the first lens can be controlled, which is conducive to reducing the burden of correcting chromatic aberration of other lenses, and leaving a degree of freedom for correcting other aberrations.

[0068] In the example embodiment, according to the super-telephoto periscope camera module of the present application, it satisfies: HY1<0.7*EFL; wherein HY1 is the distance from the second incident surface of the second prism 40 to the upper end point of the imaging surface IMG, and EFL is the effective focal length of the super-telephoto periscope camera module. Satisfying HY1<0.7*EFL, by controlling the size range of the distance HY1 from the second incident surface of the second prism 40 to the upper end point of the imaging surface IMG, it is conducive to controlling the size of the camera module, and realizing the miniaturization of the camera module.

[0069] In the example embodiment, according to the super-telephoto periscope camera module of the present application, it satisfies: 0.4DOF<Saf<0.9DOF; wherein Saf is the focusing stroke of the second lens assembly 30 moving along the second optical axis direction o2 to complete the focusing work, and DOF is the depth of field of the super-telephoto periscope camera module. Satisfying 0.4DOF<Saf<0.9DOF, by controlling the size range of the focusing stroke Saf of the second lens assembly 30 moving along the second optical axis direction o2 to complete the focusing work, the focusing can be completed with a smaller focusing stroke, and the focusing speed is faster and the power consumption is smaller.

[0070] In the example embodiment, according to the super-telephoto periscope camera module of the present application, it satisfies: 0.1EFL<DTP3<0.3EFL, 0.1EFL<DTP4<0.3EFL; wherein DTP3 is the thickness of the second prism 40, i.e. the distance from the third reflecting surface to the bottom surface, DTP4 is the thickness of the third prism 50, i.e. the distance from the fifth reflecting surface to the fourth reflecting surface, and EFL is the effective focal length of the super-telephoto periscope camera module. Satisfying 0.1EFL<DTP3<0.3EFL, 0.1EFL<DTP4<0.3EFL, by controlling the size range of the thickness of the second prism 40 and the third prism 50, it is conducive to controlling the size of the camera module, and realizing the miniaturization of the camera module.

[0071] In the example embodiment, according to the super-telephoto periscope camera module of the present application, the materials of the lenses in the first lens assembly 20 and the second lens assembly 30 can be glass, plastic, or glass-plastic hybrid, etc.

[0072] In the example embodiment, the super-telephoto periscope camera module according to the present application further comprises a diaphragm. Preferably, the diaphragm can be arranged on the first incident surface of the first prism 10. However, the present application is not limited thereto, and the diaphragm can also be arranged on the object side surface of the lens closest to the object side of the first lens assembly 20, or between two adjacent lenses of the first lens assembly 20, etc.

[0073] In the example embodiment, the super-telephoto periscope camera module according to the present application further comprises an optical filter IR. Preferably, the optical filter IR can be arranged between the third incident surface of the third prism 50 and the imaging surface IMG of the imaging assembly.

[0074] In the example embodiment, the driving assembly can be integrally assembled with the imaging assembly or separately assembled.

[0075] In the example embodiment, the second incident surface, the second reflecting surface, the third reflecting surface and the second exit surface of the second prism 40, and the third incident surface, the fourth reflecting surface, the fifth reflecting surface and the third exit surface of the third prism 50 can all be inhibited from affecting stray light by means of ink coating, silk printing, etc., and the silk printing area is taken as the boundary according to a short side 0.7F and a long side 0.9F of the light spot.

[0076] In the example embodiment, the second prism 40 and the third prism 50 can be modified by cutting corners or rounding corners, and the corners cut or rounded can all be inhibited from affecting stray light by means of film coating, silk printing, etc., which helps to improve the reliability of the module and reduce stray light.

[0077] In the example embodiment, the automatic focusing (AF) driving of the second lens assembly 30 can adopt a voice coil motor (VCM), and the motion guide structure thereof can select a scheme of a suspension wire, a spring sheet, a ball or a guide rod, etc.

[0078] Based on the same inventive concept, the electronic device according to the example embodiment of the present application comprises the super-telephoto periscope camera module described above. The electronic device can be, but is not limited to, a smartphone, a tablet computer, a notebook computer, a gimbal shooting device, a monitoring lens, a vehicle-mounted monitoring device and other imaging devices. The implementation of the electronic device can refer to the embodiments of the super-telephoto periscope camera module, and the repeated parts will not be described herein.

[0079] However, those skilled in the art should understand that the number of lenses constituting the optical imaging lens can be changed without departing from the technical solutions claimed by the present application, so as to obtain the various results and advantages described in the present specification. For example, although five lenses are described as an example in the embodiments, the optical imaging lens is not limited to comprising five lenses. If necessary, the optical imaging lens can also comprise other numbers of lenses.

[0080] Specific embodiments of the super-tele periscope camera module applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0081] Example 1 The following refers to Figure 4 A super-tele periscope camera module according to Embodiment 1 of the present application is described. Figure 4 A folded optical path front structure schematic diagram of the super-tele periscope camera module according to Embodiment 1 of the present application is shown.

[0082] As Figure 4 shown, the super-tele periscope camera module includes a first prism 10, a first lens assembly 20, a second lens assembly 30, a second prism 40, a third prism 50, and an imaging assembly; the first prism 10 includes a first incident surface, a first reflecting surface, and a first exit surface; light rays are incident from the first incident surface along a first optical axis direction o1, are deflected by 90° after being reflected by the first reflecting surface, the optical axis direction is changed to a second optical axis direction o2, and are emitted from the first exit surface; the first lens assembly 20 includes at least one lens, and each lens of the first lens assembly 20 is arranged on the object side and / or the image side of the first prism 10; the second lens assembly 30 includes at least one lens, and the second lens assembly 30 moves in the second optical axis direction o2 to focus between infinity and macro; and the second lens assembly 30 also moves perpendicular to the second optical axis direction to achieve OIS anti-shake effect; the second prism 40 includes a second incident surface, a second reflecting surface, a third reflecting surface, and a second exit surface, the second incident surface is arranged opposite to the light exit surface of the second lens assembly 30, and the second reflecting surface and the second exit surface are different regions of the same plane; when the light rays pass through the second prism 40, the light rays are incident from the second incident surface along the second optical axis direction o2, and are emitted from the second exit surface after being reflected at least once in turn by the second reflecting surface and the third reflecting surface; the third prism 50 includes a third incident surface, a fourth reflecting surface, a fifth reflecting surface, and a third exit surface, the third incident surface is arranged parallel to the second exit surface, and is also arranged parallel to the third exit surface, and the fourth reflecting surface and the fifth reflecting surface are arranged parallel to each other; when the light rays pass through the third prism 50, the light rays are incident from the third incident surface, and are emitted from the third exit surface to the imaging surface IMG of the imaging assembly after being reflected at least once in turn by the fourth reflecting surface and the fifth reflecting surface. An aperture can be arranged on the first incident surface of the first prism 10. An infrared filter IR can be arranged between the third exit surface of the third prism 50 and the imaging surface IMG of the imaging assembly.

[0083] In the embodiment 1, at least one lens of the first lens assembly 20 is disposed on the object side of the first prism 10, and all the rest lenses are disposed on the image side of the first prism 10; specifically, the first lens assembly 20 includes a first lens G41, a second lens P42 and a third lens P43, the first lens G41 is disposed on the object side of the first prism 10, the second lens P42 and the third lens P43 are both disposed on the image side of the first prism 10, the first lens G41 is disposed opposite to the first incident surface of the first prism 10, and the second lens P42 is disposed opposite to the first exit surface of the first prism 10. In other embodiments, all the lenses of the first lens assembly 20 are disposed on the object side of the first prism 10, or all the lenses of the first lens assembly 20 are disposed on the image side of the first prism 10.

[0084] In the embodiment 1, the second lens assembly 30 includes at least one lens; the second lens assembly 30 moves in the second optical axis direction o2 to focus between infinity and macro; specifically, the second lens assembly 30 includes a fourth lens and a fifth lens, and the fifth lens is disposed opposite to the third incident surface of the third prism 50.

[0085] Please refer to the following Figure 4 and Table 1. The first lens G41, the second lens P42 and the third lens P43 of the first lens assembly 20 have positive refractive power. The object side surface of the first lens G41 is a standard surface, specifically a standard convex spherical surface, and the image side surface is a plane. The object side surface of the second lens P42 is a concave surface, and the image side surface is a concave surface. The object side surface of the third lens P43 is a convex surface, and the image side surface is a convex surface. The fourth lens P44 and the fifth lens P45 of the second lens assembly 30 have positive refractive power. The object side surface of the fourth lens P44 is a convex surface, and the image side surface is a concave surface. The object side surface of the fifth lens P45 is a convex surface, and the image side surface is a concave surface. The light from the object sequentially passes through the first lens G41, the diaphragm, the first prism 10, the second lens P42, the third lens P43, the fourth lens P44, the fifth lens P45, the second prism 40 and the third prism 50. When the light passes through the second prism 40, it is incident along the second optical axis direction o2 from the second incident surface, and then at least reflects once on the second reflection surface and the third reflection surface before being emitted from the second exit surface. When the light passes through the third prism 50, it is incident from the third incident surface, and then at least reflects once on the fourth reflection surface and the fifth reflection surface before being emitted from the third exit surface to the imaging surface IMG of the imaging assembly.

[0086] Table 1 shows the basic parameter table of the super telephoto periscope camera module of the embodiment 1, wherein the units of the curvature radius, the thickness and the focal length are all millimeters (mm).

[0087] Table 1:

[0088] Wherein, G1R1 represents the object side of the first lens G41, G2R2 represents the image side of the first lens G41; the stop corresponds to the first incident surface of the first prism 10; PrismR2 represents the first exit surface of the first prism 10; P2R1 represents the object side of the second lens P42, P2R2 represents the image side of the second lens P42; P3R1 represents the object side of the third lens P43, P3R2 represents the image side of the third lens P43; P4R1 represents the object side of the fourth lens P44, P4R2 represents the image side of the fourth lens P44; P5R1 represents the object side of the fifth lens P45, P5R2 represents the image side of the fifth lens P45; Prism2R1 represents the second incident surface of the second prism 40, Prism2R2 represents the third exit of the third prism 50. Wherein, the positive and negative of the radius of curvature is distinguished with the left and right of the center of the surface, and the object side is on the left and the image side is on the right, if the surface is on the left of the center, the radius of curvature is positive, if the surface is on the right of the center, the radius of curvature is negative.

[0089] Table 2 shows the positions of the fourth lens P44 and the fifth lens P45 of the second lens assembly 30 of the super-tele periscope camera module of embodiment 1 when focusing at object distance infinity and object distance 20cm, wherein H1 represents the distance between the image side of the third lens P43 and the image side of the fourth lens P44, H2 represents the distance between the image side of the fifth lens P45 and the second incident surface of the second prism 40, the units of H1 and H2 are millimeters (mm); Table 2:

[0090] In embodiment 1, the object side and the image side of any one of the second lens P42 to the fifth lens P45 can be both extended aspheres, and the surface type of each extended asphere can be defined by, but not limited to, the following aspherical formula: (1) Wherein, x is the distance from the vertex of the extended asphere when the extended asphere is at a position with a height of h along the optical axis direction, h is the height of the extended asphere; c is the paraxial curvature of the extended asphere, c = 1 / R (i.e., the paraxial curvature c is the inverse of the radius of curvature in Table 1); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the extended asphere.

[0091] Table 3 shows the conic coefficient k and the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 and A24 that can be used when the object side and the image side of the second lens P42 to the fifth lens P45 in embodiment 1 are extended aspheres.

[0092] Table 3:

[0093] In embodiment 1, the system focal length of the super-telephoto periscope camera module is 43.5 mm, the working waveband is 435~650 nm, the working F number F.No is 3.5, the imaging circle diameter is 8.192 mm, the field of view angle is 10.8°, and the total optical length is 52.6 mm. There is a relationship between the focal length f1 of the first lens G41 and the system focal length f of the super-telephoto periscope camera module, f / f1=43.5 / 12.3=3.537, which satisfies 2<f / f1<4. The refractive index n1 of the first lens G41 is 1.694 and the Abbe number V1 is 49.2, which satisfies 1.55≤n1≤1.1.98; 45≤V1≤90.

[0094] Figure 5 A far focus state MTF curve diagram of the super-telephoto periscope camera module of embodiment 1 is shown, and the MTF (Modulation Transfer Function) curve shows the transmission of image details (i.e. image contrast) of the imaging system to different spatial frequencies. The OTF modulus is greater than 0.2 at infinity and spatial frequency 250 lp / mm, and the resolving power is very good. Figure 6 A MTF defocus curve diagram of the super-telephoto periscope camera module of embodiment 1 is shown, and the MTF defocus curve diagram represents the MTF values at different positions from the focal plane at a fixed frequency, Figure 6 It can be seen that the MTF curve is concentrated, and the field curvature is less than 0.02 mm. Figure 7 A light fan diagram of the super-telephoto periscope camera module of embodiment 1 is shown, and the light fan diagram generally shows the cross section of the light beam at different positions, as well as the path and change in the optical system, which is a comprehensive evaluation diagram of various aberrations. The scale is ±0.01 um, i.e. the scale range in the horizontal and vertical directions is ±0.01 um, various aberrations are well corrected, and the overall aberration of the system is small. Figure 8 A field curvature and distortion diagram of the super-telephoto periscope camera module of embodiment 1 is shown, Figure 8 It can be seen that the field curvature is less than ±0.005 mm, and the distortion is less than 2.0%, which is well corrected. Figure 9 A vertical axis chromatic aberration diagram of the super-telephoto periscope camera module of embodiment 1 is shown, Figure 9 It can be seen that the vertical axis chromatic aberration is within ±0.5 um, and the color restoration degree is good. Figure 10 A relative luminance and actual chief ray image height diagram of the super-telephoto periscope camera module of embodiment 1 is shown, and the relative luminance is greater than 70%, and the picture brightness is uniform. According to Figures 5 to 10 It can be seen that the super-telephoto periscope camera module given in embodiment 1 can achieve good imaging quality.

[0095] Example 2 The following refers toFigure 11 This application describes an ultra-long telephoto periscope camera module according to Embodiment 2 of this application. Figure 11 A schematic diagram of the folded optical path front structure of an ultra-telephoto periscope camera module according to Embodiment 2 of this application is shown.

[0096] like Figure 11 As shown, the ultra-long telephoto periscope camera module includes a first prism 10, a first lens assembly 20, a second lens assembly 30, a second prism 40, a third prism 50, and an imaging component. The first prism 10 includes a first incident surface, a first reflecting surface, and a first exiting surface. Light rays enter from the first incident surface along the first optical axis direction o1, are reflected by the first reflecting surface, deflected by 90°, and the optical axis direction changes to the second optical axis direction o2 before exiting from the first exiting surface. The first lens assembly 20 includes at least one lens, and each lens of the first lens assembly 20 is disposed on the object side and / or image side of the first prism 10. The second lens assembly 30 includes at least one lens, and the second lens assembly 30 moves along the second optical axis direction o2 to focus between infinity and macro distances, and also moves perpendicular to the second optical axis direction to achieve OIS image stabilization. The second prism 40 includes a first incident surface, a first reflecting surface, and a first exiting surface. The second prism 40 comprises two incident surfaces, a second reflecting surface, a third reflecting surface, and a second exiting surface. The second incident surface is positioned opposite the light-emitting surface of the second lens assembly 30. The second reflecting surface and the second exiting surface are different regions of the same plane. When light passes through the second prism 40, it enters through the second incident surface along the second optical axis direction o2, and is reflected at least once by the second and third reflecting surfaces before exiting through the second exiting surface. The third prism 50 includes a third incident surface, a fourth reflecting surface, a fifth reflecting surface, and a third exiting surface. The third incident surface is parallel to the second exiting surface, and the fourth and fifth reflecting surfaces are also parallel to each other. When light passes through the third prism 50, it enters through the third incident surface, and is reflected at least once by the fourth and fifth reflecting surfaces before exiting through the third exiting surface to the imaging surface IMG of the imaging assembly. An aperture can be provided on the first incident surface of the first prism 10. An IR filter can be provided between the third exiting surface of the third prism 50 and the imaging surface IMG of the imaging assembly.

[0097] In the embodiment 2, at least one lens of the first lens assembly 20 is disposed on the object side of the first prism 10, and all the rest lenses are disposed on the image side of the first prism 10; specifically, the first lens assembly 20 includes a first lens G51, a second lens P52 and a third lens P53, the first lens G51 is disposed on the object side of the first prism 10, the second lens P52 and the third lens P53 are both disposed on the image side of the first prism 10, the first lens G51 is disposed opposite to the first incident surface of the first prism 10, and the second lens P52 is disposed opposite to the first exit surface of the first prism 10. In other embodiments, all the lenses of the first lens assembly 20 are disposed on the object side of the first prism 10, or all the lenses of the first lens assembly 20 are disposed on the image side of the first prism 10.

[0098] In the embodiment 2, the second lens assembly 30 includes at least one lens; the second lens assembly 30 moves in the second optical axis direction o2 to focus between infinity and macro; specifically, the second lens assembly 30 includes a fourth lens P54 and a fifth lens P55, and the fifth lens P55 is disposed opposite to the third incident surface of the third prism 50.

[0099] Please refer to the following Figure 11 and Table 4. The first lens G51, the second lens P52 and the third lens P53 of the first lens assembly 20 have positive refractive power. The object side surface of the first lens G51 is a standard surface, specifically a standard convex spherical surface, and the image side surface is a plane. The object side surface of the second lens P52 is a concave surface, and the image side surface is a concave surface. The object side surface of the third lens P53 is a convex surface, and the image side surface is a convex surface. The fourth lens P54 and the fifth lens P55 of the second lens assembly 30 have positive refractive power. The object side surface of the fourth lens P54 is a convex surface, and the image side surface is a concave surface. The object side surface of the fifth lens P55 is a convex surface, and the image side surface is a concave surface. The light from the object sequentially passes through the first lens G51, the diaphragm, the first prism 10, the second lens P52, the third lens P53, the fourth lens P54, the fifth lens P55, the second prism 40 and the third prism 50. When the light passes through the second prism 40, it is incident along the second optical axis direction o2 from the second incident surface, and then at least reflects once on the second reflection surface and the third reflection surface before being emitted from the second exit surface. When the light passes through the third prism 50, it is incident from the third incident surface, and then at least reflects once on the fourth reflection surface and the fifth reflection surface before being emitted from the third exit surface to the imaging surface IMG of the imaging assembly.

[0100] Table 4 shows the basic parameter table of the super telephoto periscope camera module of the embodiment 2, wherein the units of the curvature radius, the thickness and the focal length are millimeters (mm).

[0101] Table 4:

[0102] Wherein, G1R1 represents the object side surface of the first lens G51, G2R2 represents the image side surface of the first lens G51; the stop corresponds to the first incident surface of the first prism 10; PrismR2 represents the first exit surface of the first prism 10; P2R1 represents the object side surface of the second lens P52, P2R2 represents the image side surface of the second lens P52; P3R1 represents the object side surface of the third lens P53, P3R2 represents the image side surface of the third lens P53; P4R1 represents the object side surface of the fourth lens P54, P4R2 represents the image side surface of the fourth lens P54; P5R1 represents the object side surface of the fifth lens P55, P5R2 represents the image side surface of the fifth lens P55; Prism2R1 represents the second incident surface of the second prism 40, Prism2R2 represents the third exit of the third prism 50. Wherein, the positive and negative of the radius of curvature is distinguished with the left and right of the center of the surface, and the object side is on the left and the image side is on the right, if the surface is on the left of the center, the radius of curvature is positive, if the surface is on the right of the center, the radius of curvature is negative.

[0103] Table 5 shows the positions of the fourth lens P54 and the fifth lens P55 of the second lens assembly 30 of the super-tele periscope camera module of Example 2 when focusing at object distance infinity and object distance 120 cm, wherein H1 represents the distance between the image side surface of the third lens P53 and the image side surface of the fourth lens P54, H2 represents the distance between the image side surface of the fifth lens P55 and the second incident surface of the second prism 40, the units of H1 and H2 are both millimeters (mm); Table 5:

[0104] Table 6 shows the conic constant k and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 and A24 of the extended aspherical surface that can be used for the object side surface and the image side surface of the second lens P52 to the fifth lens P55 in Example 2. Wherein, the surface type of each extended aspherical surface can be defined by the formula (1) given in Example 1 above.

[0105] Table 6:

[0106] In embodiment 2, the system focal length of the super telephoto periscope camera module is 38.3 mm, the working waveband is 435-650 nm, the working F number F.No is 3.5, the imaging circle diameter is 7.2 mm, the field of view angle is 10.8°, and the total optical length is 48.1 mm. There is a relationship between the focal length f1 of the first lens G51 and the system focal length f of the super telephoto periscope camera module, f / f1=38.3 / 10.9=3.514, which satisfies 2<f / f1<4. The refractive index n1 of the first lens G51 is 1.694 and the Abbe number V1 is 49.2, which satisfies 1.55≤n1≤1.1.98; 45≤V1≤90.

[0107] Figure 12 A telephoto state MTF curve diagram of the super telephoto periscope camera module of embodiment 2 is shown. The MTF (Modulation Transfer Function) curve shows the transmission of image details (i.e. image contrast) of the imaging system at different spatial frequencies. The OTF modulus is greater than 0.2 at infinity, spatial frequency 250 lp / mm, and the resolving power is very good. Figure 13 A MTF defocus curve diagram of the super telephoto periscope camera module of embodiment 2 is shown. The MTF defocus curve diagram represents the MTF values at different positions from the focal plane at a fixed frequency, Figure 13 It can be seen that the MTF curve is concentrated, and the field curvature is less than 0.02 mm. Figure 14 A light fan diagram of the super telephoto periscope camera module of embodiment 2 is shown. The light fan diagram generally shows the cross section of the light beam at different positions, as well as the path and change in the optical system, which is a comprehensive evaluation diagram of various aberrations. The scale is ±20 um, i.e. the scale range in the horizontal and vertical directions is ±20 um. Various aberrations are well corrected, and the overall aberration of the system is very small. Figure 15 A field curvature and distortion diagram of the super telephoto periscope camera module of embodiment 2 is shown, Figure 15 It can be seen that the field curvature is less than ±0.010 mm, and the distortion is less than 2.0%, which is well corrected. Figure 16 A relative luminance and actual chief ray image height diagram of the super telephoto periscope camera module of embodiment 2 is shown. The relative luminance is greater than 70%, and the picture brightness is uniform. According to Figures 12 to 16 It can be seen that the super telephoto periscope camera module given in embodiment 2 can achieve good imaging quality.

[0108] The above description is only the preferred embodiment of the present application and the explanation of the technical principles. It should be understood by those skilled in the art that the scope of the disclosure of the present application is not limited to the technical scheme composed of the specific combination of the above technical features, and should also cover other technical schemes formed by the combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical scheme formed by replacing the above features with the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. A super telephoto periscope camera module, characterized in that, It includes a first prism, a first lens assembly, a second lens assembly, a second prism, a third prism, and an imaging assembly; The first prism includes a first incident surface, a first reflecting surface, and a first exit surface; light rays enter from the first incident surface along the first optical axis, are reflected by the first reflecting surface, and then the optical axis changes to the second optical axis, and the light rays exit from the first exit surface; The first lens assembly includes at least one lens, and each lens of the first lens assembly is disposed on the object side and / or image side of the first prism. The second lens assembly includes at least one lens, and the second lens assembly moves in the direction of the second optical axis to focus from infinity to macro, and moves in the direction perpendicular to the second optical axis to achieve OIS image stabilization. The second prism includes a second incident surface, a second reflecting surface, a third reflecting surface, and a second exiting surface. The second incident surface is disposed opposite to the light-emitting surface of the second lens assembly. When light passes through the second prism, it enters through the second incident surface along the second optical axis and is reflected at least once by the second reflecting surface and the third reflecting surface before exiting through the second exiting surface. The third prism includes a third incident surface, a fourth reflecting surface, a fifth reflecting surface, and a third exiting surface. The third incident surface and the second exiting surface are arranged parallel to each other. When light passes through the third prism, it enters through the third incident surface and is reflected at least once by the fourth and fifth reflecting surfaces before exiting through the third exiting surface to the imaging surface of the imaging component.

2. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The second exit surface of the second prism and the third incident surface of the third prism are glued and fixed together, or are spaced apart to form an air gap, wherein the thickness CTa of the air gap satisfies: CTa>0.01mm.

3. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The angle between the first optical axis direction and the second optical axis direction is 90°.

4. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The third incident surface and the third exit surface are arranged parallel to each other, and the fourth reflecting surface and the fifth reflecting surface are arranged parallel to each other.

5. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The total height HZ1 and the shoulder height HZ2 of the ultra-telephoto periscope camera module satisfy: HZ1 < 0.4EFL, HZ2 < 0.3EFL, where EFL is the effective focal length of the ultra-telephoto periscope camera module.

6. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The direction of the outgoing optical axis of the light ray when it passes through the second prism is perpendicular to the second outgoing surface, and the direction of the outgoing optical axis of the light ray when it passes through the third prism is perpendicular to the third outgoing surface.

7. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The light is configured to satisfy the condition of total internal reflection when reflected by the second reflective surface, and the third, fourth, and fifth reflective surfaces are coated with reflective films for specular reflection.

8. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, When light passes through the second prism and the third prism, it undergoes two reflections, causing the optical axis direction to change sequentially to the second optical axis direction, the third optical axis direction, the fourth optical axis direction, the fifth optical axis direction, and the sixth optical axis direction. The included angle θ1 between the second optical axis direction and the third optical axis direction satisfies 100° < θ1 < 140°; the included angle θ2 between the third optical axis direction and the fourth optical axis direction satisfies 50° < θ2 < 70°; the included angle θ3 between the fourth optical axis direction and the fifth optical axis direction satisfies 40° < θ3 < 80°; the included angle θ4 between the fifth optical axis direction and the sixth optical axis direction satisfies 40° < θ4 < 80°.

9. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The included angle θ5 between the first optical axis direction and the imaging surface satisfies 140° < θ5 < 160°.

10. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The first prism and the second prism are right triangle prisms, and the third prism is a pentagonal prism. Among them, the included angle α between the third reflecting surface and the second exit surface of the second prism satisfies 20° < α < 40°.

11. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The included angle β between the third incident surface and the fourth reflecting surface of the third prism satisfies 20° < β < 40°.

12. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, For the total height HZ1 of the ultra-long focal length periscope camera module, the working F-number F.No of the ultra-long focal length periscope camera module satisfies: 0.1 < F.No / HZ1 < 0.

4.

13. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The lens closest to the object side in the first lens assembly is the first lens, and the focal length f1 of the first lens satisfies: 2 < f / f1 < 4, and f1 > 0, where f represents the system focal length of the ultra-long focal length periscope camera module.

14. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The lens closest to the object side in the first lens assembly is the first lens, and the refractive index n1 and Abbe number V1 of the first lens satisfy: 1.55 ≤ n1 ≤ 1.98; 45 ≤ V1 ≤ 90.

15. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The distance HY1 from the second incident surface of the second prism to the upper endpoint of the imaging surface satisfies: HY1 < 0.7*EFL, where EFL represents the effective focal length of the ultra-long focal length periscope camera module.

16. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The focusing stroke Saf for the second lens assembly to move along the second optical axis direction to complete the focusing work satisfies: 0.4DOF < Saf < 0.9DOF, where DOF represents the depth of field of the ultra-long focal length periscope camera module.

17. The ultra-long telephoto periscope camera module according to claim 1, characterized in that, The thickness DTP3 of the second prism satisfies: 0.1EFL < DTP3 < 0.3EFL, and the thickness DTP4 of the third prism satisfies: 0.1EFL < DTP4 < 0.3EFL, where EFL represents the effective focal length of the ultra-long focal length periscope camera module.

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