Mobile phone telescope
By designing a mobile phone telescope and using a clamp and telescopic optical system, the problem of difficulty in combining traditional telescopes with mobile phones is solved, achieving portable and clear long-distance shooting effects, while reducing system size and production costs.
Patent Information
- Application Number
- CN202423059442.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-12-11
AI Technical Summary
Traditional telescopes are large and heavy, making them difficult to effectively combine with mobile phones, affecting the clarity and portability of photographing distant scenes.
A mobile phone telescope is designed, including a housing, a clamp and a telescopic optical system. The clamp is used to clamp the mobile phone camera, and the telescopic optical system is used to take pictures. The optical system consists of multiple lenses and prisms, and the optical focal length and dispersion coefficient are reasonably distributed to reduce the system size. An elastic pressure pad is also provided to prevent wear.
The mobile phone can clearly capture distant scenes. The cooperation between the gripper and the optical system makes the system miniaturized, easy to carry, reduces production costs, and prevents camera wear.
Smart Images
Figure CN223401100U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical lenses, in particular to a mobile phone telescope. Background Art
[0002] As mobile phone camera functions continue to improve and the quality of photos is improving, many people enjoy using their phones to take photos while traveling. Due to the limitations of mobile phone size, conventional mobile phone imaging lenses have a relatively short focal length, making it difficult for mobile phones to directly capture high-resolution photos of distant scenes. Traditional telescopes are large and heavy, making them difficult to portability. This makes it difficult to directly take photos with a phone by placing it close to the telescope eyepiece. Therefore, it is necessary to design a telescope that can be used with mobile phones to address these issues. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a mobile phone telescope for assisting mobile phone shooting.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a mobile phone telescope, including a shell, a clamping claw and a telescopic optical system, the shell is provided with a light inlet hole and a shooting hole, the telescopic optical system is installed between the light inlet hole and the shooting hole, an elastic pressure pad is provided on the outside of the shooting hole, and the clamping claw is installed on the side of the shell where the shooting hole is provided.
[0005] Furthermore, the clamping jaw is rotatably connected to the shell.
[0006] Furthermore, the axial direction of the light inlet hole and the axial direction of the shooting hole are arranged at an angle.
[0007] Furthermore, the telescopic optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the object side to the image side; the first lens has positive focal power, the second lens has negative focal power, the third lens has negative focal power, the fourth lens has positive focal power, the fifth lens has positive focal power, the sixth lens has positive focal power, and the seventh lens has negative focal power.
[0008] Furthermore, it also includes an aperture, which is arranged between the second lens and the third lens.
[0009] Furthermore, a dove prism is provided between the second lens and the aperture, and a right-angle prism is provided between the aperture and the third lens; the second lens, the dove prism, the aperture, the right-angle prism and the third lens satisfy: 0.6 28 / TL<0.8,0.03 83 / TL<0.07, where A 28 is the sum of the air distance between the second lens and the aperture and the equivalent thickness of the Dove prism, TL is the overall length of the telescopic optical system, A 83 It is the sum of the air distance between the aperture and the third lens and the equivalent thickness of the right-angle prism.
[0010] Furthermore, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy:
[0011] f 1-2 >200;
[0012] 0 <f 3-7 <20;
[0013] 0.5 <f 3-5 / f 3-7 <2;
[0014] -6 <f 6-7 / f 3-7 <-2;
[0015] 1 <TL / f 1-2 <1.5;
[0016] where f 1-2 is the combined focal length of the first and second lenses, f 3-7 is the combined focal length of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, f 3-5 is the combined focal length of the third lens, the fourth lens and the fifth lens, f 6-7 is the combined focal length of the sixth lens and the seventh lens, and TL is the overall length of the telephoto optical system.
[0017] Furthermore, the first lens, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens satisfy:
[0018] |Nd1-Nd2|>0.15;
[0019] Nd3>1.7;
[0020] Nd4>1.7;
[0021] |Nd6-Nd7|>0.2;
[0022] Wherein, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, Nd6 is the refractive index of the sixth lens, and Nd7 is the refractive index of the seventh lens.
[0023] Furthermore, the first lens, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens satisfy:
[0024] |Vd1-Vd2|>20;
[0025] Vd3<50;
[0026] Vd4<50;
[0027] |Vd6-Vd7|>25;
[0028] Wherein, Vd1 is the chromatic aberration coefficient of the first lens, Vd2 is the chromatic aberration coefficient of the second lens, Vd3 is the chromatic aberration coefficient of the third lens, Vd4 is the chromatic aberration coefficient of the fourth lens, Vd6 is the chromatic aberration coefficient of the sixth lens, and Vd7 is the chromatic aberration coefficient of the seventh lens.
[0029] Furthermore, a neutral density filter is included, and the neutral density filter is arranged on the object side of the first lens.
[0030] The beneficial effects of the present invention are as follows: the clamping claws of the mobile phone telescope can clamp the mobile phone so that the mobile phone's camera is accurately aligned with the shooting hole, thereby using the telescopic optical system to enable the mobile phone to clearly capture distant scenes. The elastic pressure pad can prevent friction between the housing and the mobile phone, which may cause wear on the mobile phone camera. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 This is a schematic structural diagram of a mobile phone telescope according to the first embodiment of the present utility model;
[0032] Figure 2 This is a structural diagram of the telescopic optical system in the mobile phone telescope according to the first embodiment of the present utility model;
[0033] Figure 3 This is a schematic diagram of the surface numbering of the telescopic optical system in the mobile phone telescope according to the first embodiment of the present utility model;
[0034] Figure 4 This is an MTF curve diagram of an ideal lens with a focal length of 5mm set at the exit pupil position of the telescopic optical system in the mobile phone telescope according to the first embodiment of the present utility model;
[0035] Figure 5 This is a graph showing the MTF value of the telescopic optical system in the mobile phone telescope according to the first embodiment of the present utility model changing with the field of view at a specific spatial frequency;
[0036] Figure 6 This is the dispersion pattern of the telescopic optical system in the mobile phone telescope according to the first embodiment of the present invention in the afocal mode.
[0037] Description of labels:
[0038] 1. Housing; 11. Light inlet; 12. Shooting hole; 13. Elastic pressure pad;
[0039] 2. Gripper;
[0040] 31. First lens; 32. Second lens; 33. Third lens; 34. Fourth lens; 35. Fifth lens; 36. Sixth lens; 37. Seventh lens; 38. Aperture lens; 39. Dove prism; 310. Right-angle prism; 311. Neutral density filter. DETAILED DESCRIPTION
[0041] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.
[0042] Please refer to Figures 1 to 6 The mobile phone telescope includes a shell 1, a clamping jaw 2 and a telescopic optical system. The shell 1 is provided with a light inlet hole 11 and a shooting hole 12. The telescopic optical system is installed between the light inlet hole 11 and the shooting hole 12. An elastic pressure pad 13 is provided on the outside of the shooting hole 12. The clamping jaw 2 is installed on the side of the shell 1 where the shooting hole 12 is provided.
[0043] As can be seen from the above description, the beneficial effects of the present invention are as follows: the clamping claws 2 of the present mobile phone telescope can clamp the mobile phone, accurately aligning the mobile phone's camera with the shooting hole 12, thereby using the telescopic optical system to enable the mobile phone to clearly capture distant scenes. The elastic pressure pad 13 can prevent the housing 1 and the mobile phone from rubbing against each other, which may cause wear on the mobile phone's camera.
[0044] Furthermore, the clamping jaw 2 is rotatably connected to the housing 1 .
[0045] From the above description, it can be seen that when the telescopic optical system needs to be used, the user can rotate the clamp 2 to align the mobile phone camera with the shooting hole 12. When the telescopic optical system is not needed, the user can rotate the clamp 2 to offset the mobile phone camera from the shooting hole 12.
[0046] Furthermore, the axial direction of the light inlet 11 and the axial direction of the shooting hole 12 are arranged at an angle.
[0047] As can be seen from the above description, by changing the direction of the optical path, the overall length of the mobile phone telescope and the relative position of the housing 1 and the mobile phone can be effectively shortened, making it easier to use.
[0048] Furthermore, the telescopic optical system includes a first lens 31, a second lens 32, a third lens 33, a fourth lens 34, a fifth lens 35, a sixth lens 36 and a seventh lens 37 arranged in sequence from the object side to the image side; the first lens 31 has positive focal power, the second lens 32 has negative focal power, the third lens 33 has negative focal power, the fourth lens 34 has positive focal power, the fifth lens 35 has positive focal power, the sixth lens 36 has positive focal power, and the seventh lens 37 has negative focal power.
[0049] As can be seen from the above description, the present telescopic optical system reduces the overall size and weight of the system by setting up a combination of lenses with different structures and rationally distributing the optical focal length of each lens while ensuring the magnification of the telescopic optical system. This is conducive to the miniaturization of the finished device and makes it easier to carry. At the same time, it can reduce production costs and is conducive to its popularization and use.
[0050] Furthermore, an aperture 38 is included, and the aperture 38 is provided between the second lens 32 and the third lens 33 .
[0051] As can be seen from the above description, the aperture 38 is used to control the size of the field of view.
[0052] Furthermore, a dove prism 39 is provided between the second lens 32 and the aperture 38, and a right-angle prism 310 is provided between the aperture 38 and the third lens 33; the second lens 32, the dove prism 39, the aperture 38, the right-angle prism 310 and the third lens 33 satisfy: 0.6 28 / TL<0.8,0.03 83 / TL<0.07, where A 28 is the sum of the air distance between the second lens 32 and the aperture 38 and the equivalent thickness of the Dove prism 39, TL is the overall length of the telescopic optical system, and A 83 It is the sum of the air distance between the aperture 38 and the third lens 33 and the equivalent thickness of the right-angle prism 310 .
[0053] As can be seen from the above description, dove prism 39 and right-angle prism 310 can redirect the optical path, facilitating the telescopic optical system's adaptation to the interior space of a finished device or reducing its overall length. Aperture stop 38 is positioned at a suitable ratio between second lens element 32 and third lens element 33 to ensure the magnification of the telescopic optical system.
[0054] Furthermore, the first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the fifth lens 35, the sixth lens 36 and the seventh lens 37 satisfy the following conditions:
[0055] f1-2 >200;
[0056] 0 <f 3-7 <20;
[0057] 0.5 <f 3-5 / f 3-7 <2;
[0058] -6 <f 6-7 / f 3-7 <-2;
[0059] 1 <TL / f 1-2 <1.5;
[0060] where f 1-2 is the combined focal length of the first lens 31 and the second lens 32, f 3-7 is the combined focal length of the third lens 33, the fourth lens 34, the fifth lens 35, the sixth lens 36 and the seventh lens 37, and f 3-5 is the combined focal length of the third lens 33, the fourth lens 34 and the fifth lens 35, f 6-7 is the combined focal length of the sixth lens element 36 and the seventh lens element 37 , and TL is the overall length of the telephoto optical system.
[0061] As can be seen from the above description, the system's magnification is maintained by controlling the focal lengths of the objective lens and eyepiece. The first lens 31 and the second lens 32 combine to form the objective lens, which collects object-side light and converges it within the optical system to form an intermediate image. The third lens 33, the fourth lens 34, and the fifth lens 35 combine to form the eyepiece. Their relatively short combined focal length allows for rapid convergence of the intermediate image within a relatively small space, facilitating system size reduction and miniaturization.
[0062] Furthermore, the first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the sixth lens 36 and the seventh lens 37 satisfy the following conditions:
[0063] |Nd1-Nd2|>0.15;
[0064] Nd3>1.7;
[0065] Nd4>1.7;
[0066] |Nd6-Nd7|>0.2;
[0067] Wherein, Nd1 is the refractive index of the first lens 31 , Nd2 is the refractive index of the second lens 32 , Nd3 is the refractive index of the third lens 33 , Nd4 is the refractive index of the fourth lens 34 , Nd6 is the refractive index of the sixth lens 36 , and Nd7 is the refractive index of the seventh lens 37 .
[0068] As can be seen from the above description, each lens is made of a material with a reasonable refractive index, especially the third lens 333 and the fourth lens 34 are both made of a high refractive index material, so as to converge the light of the intermediate image plane in a smaller space, which is conducive to miniaturization of the system.
[0069] Furthermore, the first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the sixth lens 36 and the seventh lens 37 satisfy the following conditions:
[0070] |Vd1-Vd2|>20;
[0071] Vd3<50;
[0072] Vd4<50;
[0073] |Vd6-Vd7|>25;
[0074] Wherein, Vd1 is the dispersion coefficient of the first lens 31 , Vd2 is the dispersion coefficient of the second lens 32 , Vd3 is the dispersion coefficient of the third lens 33 , Vd4 is the dispersion coefficient of the fourth lens 34 , Vd6 is the dispersion coefficient of the sixth lens 36 , and Vd7 is the dispersion coefficient of the seventh lens 37 .
[0075] As can be seen from the above description, the selection of materials with reasonable dispersion coefficients for each lens, especially the matching of high and low dispersion coefficients of the first lens 31 and the second lens 32, and the matching of high and low dispersion coefficients of the sixth lens 36 and the seventh lens 37, are beneficial to eliminating system chromatic aberration and ensuring imaging effects at large magnifications.
[0076] Furthermore, a neutral density filter 311 is included, and the neutral density filter 311 is arranged on the object side of the first lens 31 .
[0077] As can be seen from the above description, under strong light conditions, the neutral density filter 311 can attenuate the light entering the optical system to avoid overexposure when viewing the picture.
[0078] Please refer to Figures 1 to 6 , embodiment 1 of the present utility model is: a mobile phone telescope, comprising a shell 1, a clamping jaw 2 and a telescopic optical system, the shell 1 is provided with a light inlet 11 and a shooting hole 12, the telescopic optical system is installed between the light inlet 11 and the shooting hole 12, an elastic pressure pad 13 is provided on the outside of the shooting hole 12, and the clamping jaw 2 is installed on the side of the shell 1 where the shooting hole 12 is provided. Specifically, the light inlet 11 and the shooting hole 12 are both circular. The clamping jaw 2 is rotatably connected to the shell 1. The rotation axis of the clamping jaw 2 relative to the shell 1 is parallel to the axis of the shooting hole 12. An elastic gasket is provided on the inner side of the clamping jaw 2 to prevent the surface of the mobile phone from being scratched. The elastic pressure pad 13 is arranged around the shooting hole 12, and optionally, the elastic pressure pad 13 is made of rubber or silicone.
[0079] The telescopic optical system includes a first lens 31, a second lens 32, a third lens 33, a fourth lens 34, a fifth lens 35, a sixth lens 36 and a seventh lens 37, which are arranged in sequence from the object side to the image side; the first lens 31 has positive focal power, the second lens 32 has negative focal power, the third lens 33 has negative focal power, the fourth lens 34 has positive focal power, the fifth lens 35 has positive focal power, the sixth lens 36 has positive focal power, and the seventh lens 37 has negative focal power.
[0080] Specifically, the first lens 31 and the second lens 32 are combined to form an objective lens, and the third lens 33, the fourth lens 34, the fifth lens 35, the sixth lens 36, and the seventh lens 37 are combined to form an eyepiece. In this embodiment, the first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the fifth lens 35, the sixth lens 36, and the seventh lens 37 are all glass spherical lenses. The object-side and image-side surfaces of the first lens 31 are both convex; the object-side surface of the second lens 32 is concave, and the image-side surface of the second lens 32 is flat; the object-side surface of the third lens 33 is flat, and the image-side surface of the third lens 33 is concave; the object-side and image-side surfaces of the fourth lens 34 are both convex; the object-side surface of the fifth lens 35 is convex, and the image-side surface of the fifth lens 35 is concave; the object-side and image-side surfaces of the sixth lens 36 are both convex; and the object-side and image-side surfaces of the seventh lens 37 are both concave. The first lens 31 and the second lens 32 are cemented together, and the sixth lens 36 and the seventh lens 37 are cemented together.
[0081] The telescopic optical system further includes an aperture 38 , which is disposed between the second lens 32 and the third lens 33 .
[0082] The axial direction of the light inlet hole 11 is arranged at an angle to the axial direction of the shooting hole 12. In this embodiment, the axial direction of the light inlet hole 11 is perpendicular to the axial direction of the shooting hole 12.
[0083] A dove prism 39 is also disposed between the second lens 32 and the aperture 38, and a right-angle prism 310 is also disposed between the aperture 38 and the third lens 33. In this embodiment, both the dove prism 39 and the right-angle prism 310 are made of glass. The first lens 31 and the second lens 32 are coaxially arranged, and the third lens 33, the fourth lens 34, the fifth lens 35, the sixth lens 36, and the seventh lens 37 are coaxially arranged, with the axes of the third lens 33, the fourth lens 34, the fifth lens 35, the sixth lens 36, and the seventh lens 37 being perpendicular to the axes of the first lens 31 and the second lens 32. The dove prism 39 and the right-angle prism 310 can change the direction of the optical path, which helps to adapt the telescopic optical system to the internal space of a finished device or reduce the overall length of the finished device.
[0084] The second lens 32, the dove prism 39, the aperture 38, the right-angle prism 310 and the third lens 33 meet the following requirements: 0.6 28 / TL<0.8,0.03 83 / TL<0.07, where A 28 is the sum of the air distance between the second lens 32 and the aperture 38 and the equivalent thickness of the Dove prism 39, TL is the overall length of the telephoto optical system, and A 83 It is the sum of the air distance between the aperture 38 and the third lens 33 and the equivalent thickness of the right-angle prism 310.
[0085] The first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the fifth lens 35, the sixth lens 36 and the seventh lens 37 satisfy the following requirements:
[0086] f 1-2 >200;
[0087] 0 <f 3-7 <20;
[0088] 0.5 <f 3-5 / f 3-7 <2;
[0089] -6 <f 6-7 / f 3-7 <-2;
[0090] 1 <TL / f 1-2 <1.5;
[0091] where f 1-2 is the combined focal length of the first lens 31 and the second lens 32, f 3-7 is the combined focal length of the third lens 33, the fourth lens 34, the fifth lens 35, the sixth lens 36 and the seventh lens 37, and f 3-5 is the combined focal length of the third lens 33, the fourth lens 34 and the fifth lens 35, f 6-7 is the combined focal length of the sixth lens element 36 and the seventh lens element 37, and TL is the overall length of the telephoto optical system.
[0092] The first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the sixth lens 36 and the seventh lens 37 satisfy the following requirements:
[0093] |Nd1-Nd2|>0.15;
[0094] Nd3>1.7;
[0095] Nd4>1.7;
[0096] |Nd6-Nd7|>0.2;
[0097] Wherein, Nd1 is the refractive index of the first lens 31 , Nd2 is the refractive index of the second lens 32 , Nd3 is the refractive index of the third lens 33 , Nd4 is the refractive index of the fourth lens 34 , Nd6 is the refractive index of the sixth lens 36 , and Nd7 is the refractive index of the seventh lens 37 .
[0098] The first lens 31, the second lens 32, the third lens 33, the fourth lens 34, the sixth lens 36 and the seventh lens 37 satisfy the following requirements:
[0099] |Vd1-Vd2|>20;
[0100] Vd3<50;
[0101] Vd4<50;
[0102] |Vd6-Vd7|>25;
[0103] Wherein, Vd1 is the dispersion coefficient of the first lens 31 , Vd2 is the dispersion coefficient of the second lens 32 , Vd3 is the dispersion coefficient of the third lens 33 , Vd4 is the dispersion coefficient of the fourth lens 34 , Vd6 is the dispersion coefficient of the sixth lens 36 , and Vd7 is the dispersion coefficient of the seventh lens 37 .
[0104] The telescopic optical system further includes a neutral density filter 311 , which is disposed on the object side of the first lens 31 .
[0105] In this embodiment, the objective lens focal length of the telescopic optical system, that is, the combined focal length f of the first lens 31 and the second lens 32, is 1-2 =360mm; the eyepiece focal length of the telescopic optical system, that is, the combined focal length f of the third lens 33, the fourth lens 34, the fifth lens 35, the sixth lens 36 and the seventh lens 37 3-7 =15mm; in order to allow sufficient light to enter the system and still obtain high-definition images at high magnification, the telephoto optical system aperture FNO=12.5; the total length of the telephoto optical system TL=428.7mm, the magnification is 24X, and the field of view angle is 1.92°.
[0106] The specific parameters of each lens in the telescopic optical system of this embodiment are shown in Table 1 below ( Figure 3 Schematic diagram of surface numbering of the telescopic optical system according to the first embodiment of the present invention):
[0107] Table 1:
[0108]
[0109] Figure 4 、 Figure 5 and Figure 6 is an optical performance chart of the telescopic optical system in this embodiment, wherein Figure 4 The MTF curve of an ideal lens with a focal length of 5mm set at the exit pupil position can be used to evaluate the resolving power of the optical system. As can be seen from the curve in the figure, each MTF curve is close to the diffraction limit, indicating that the various aberrations of the system have been well corrected; Figure 5 This is a curve showing the MTF value of the telescopic optical system according to Example 1 of the present invention at a specific spatial frequency versus field of view. The MTF values of each field of view vary very little, indicating that the optical performance of each field of view of the system is very uniform, with little difference between the inner and outer fields. Figure 6 This is a dispersion pattern of the telescopic optical system in the afocal mode according to the first embodiment of the present invention. It can be seen from the figure that the dispersion spots of the light in each field of view are very small, and the RMS radius is much less than 3 arcmin, which further illustrates that a good imaging effect has been achieved through the telescopic optical system.
[0110] In summary, the clamping claws of the mobile phone telescope provided by the present invention can clamp the mobile phone, accurately aligning the phone's camera with the shooting hole, thereby enabling the phone to clearly capture distant scenes using the telescopic optical system. The elastic pressure pad can prevent friction between the housing and the phone, which may cause wear on the phone's camera. The telescopic optical system, by providing a combination of lenses with different structures and rationally distributing the optical power of each lens, reduces the overall size and weight of the system while ensuring the magnification of the telescopic optical system. This facilitates the miniaturization of the finished device, making it easier to carry, while also reducing manufacturing costs.
[0111] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.
Claims
1. Mobile phone telescope, characterized in that, It includes a shell, a clamp and a telescopic optical system. The shell is provided with a light inlet hole and a shooting hole. The telescopic optical system is installed between the light inlet hole and the shooting hole. An elastic pressure pad is provided on the outside of the shooting hole. The clamp is installed on the side of the shell where the shooting hole is provided.
2. The mobile phone telescope according to claim 1, characterized in that: The clamping claw is rotatably connected to the housing.
3. The mobile phone telescope according to claim 1, characterized in that: The axial direction of the light inlet hole is arranged at an angle to the axial direction of the shooting hole.
4. The mobile phone telescope according to claim 1, characterized in that: The telescopic optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side; the first lens has positive focal power, the second lens has negative focal power, the third lens has negative focal power, the fourth lens has positive focal power, the fifth lens has positive focal power, the sixth lens has positive focal power, and the seventh lens has negative focal power.
5. The mobile phone telescope according to claim 4, characterized in that: The optical system further includes an aperture, which is disposed between the second lens and the third lens.
6. The mobile phone telescope according to claim 5, characterized in that: A dove prism is further provided between the second lens and the aperture, and a right-angle prism is further provided between the aperture and the third lens; the second lens, the dove prism, the aperture, the right-angle prism and the third lens satisfy: 0.6 28 / TL<0.8,0.03 83 / TL<0.07, where A 28 is the sum of the air distance between the second lens and the aperture and the equivalent thickness of the Dove prism, TL is the overall length of the telescopic optical system, A 83 It is the sum of the air distance between the aperture and the third lens and the equivalent thickness of the right-angle prism. 7. The mobile phone telescope according to claim 4, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy the following requirements: f 1-2 >200； 0<f 3-7 <20； 0.5<f 3-5 / f 3-7 <2; -6<f 6-7 / f 3-7 <-2; 1<TL / f 1-2 <1.5; where f 1-2 is the combined focal length of the first and second lenses, f 3-7 is the combined focal length of the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, f 3-5 is the combined focal length of the third lens, the fourth lens and the fifth lens, f 6-7 is the combined focal length of the sixth lens and the seventh lens, and TL is the overall length of the telephoto optical system.
8. The mobile phone telescope according to claim 4, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens satisfy the following requirements: |Nd1-Nd2|>0.15; Nd3>1.7; Nd4>1.7; |Nd6-Nd7|>0.2; Wherein, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, Nd6 is the refractive index of the sixth lens, and Nd7 is the refractive index of the seventh lens.
9. The mobile phone telescope according to claim 4, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens satisfy the following requirements: |Vd1-Vd2|>20; Vd3<50; Vd4<50; |Vd6-Vd7|>25; Wherein, Vd1 is the chromatic aberration coefficient of the first lens, Vd2 is the chromatic aberration coefficient of the second lens, Vd3 is the chromatic aberration coefficient of the third lens, Vd4 is the chromatic aberration coefficient of the fourth lens, Vd6 is the chromatic aberration coefficient of the sixth lens, and Vd7 is the chromatic aberration coefficient of the seventh lens.
10. The mobile phone telescope according to claim 4, characterized in that: A neutral density filter is also included, and the neutral density filter is arranged on the object side of the first lens.