Long-focus telephoto lens

Abstract

The utility model provides a long-focal-length telephoto lens. The long-focal-length telephoto lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged along an optical axis from an object side to an image surface, the first object side surface of the first lens is a convex surface, and the first image side surface of the first lens is a convex surface; the second object side surface of the second lens is a convex surface, the second image side surface of the second lens is a convex surface, the third object side surface of the third lens is a concave surface, and the third image side surface of the third lens is a concave surface; the fourth object side surface of the fourth lens is a convex surface, and the fourth image side surface of the fourth lens is a convex surface; and the fifth object side surface of the fifth lens is a concave surface, and the fifth image side surface of the fifth lens is a concave surface. The long-focal-length telephoto lens provided by the utility model is simple in structure and reasonable in design, the five lenses are combined, so that light rays are refracted through the plurality of lenses, the light rays are transmitted to the image chip on the image side surface, an image with high imaging quality is realized, the total length of the lens is shortened, and the use feeling of the lens is improved.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging equipment technology, and more specifically to a long focal length telescope lens. Background Technology

[0002] An optical lens captures an object to form an optical image, then converts and transmits it to a receiver to display the image, achieving high-quality image capture at both near and far distances.

[0003] Optical lenses can be divided into short focal length lenses, medium focal length lenses, and telephoto lenses. Different focal lengths are suitable for capturing images at different distances. Relatively speaking, the larger the focal length, the longer the lens barrel becomes, and its size and weight also increase. However, when using a telephoto lens, it requires a lot of arm strength from the photographer. If the arm shakes during shooting, the camera will shake accordingly, which will affect the shooting effect. And miniaturized cameras cannot meet the needs of high imaging at long distances. Therefore, a lens with high imaging quality and reduced length and weight is needed. Utility Model Content

[0004] The purpose of this invention is to solve the aforementioned problems in the existing technology.

[0005] To achieve the above objectives, this utility model can be implemented through the following technical solution: a long focal length telescope lens, comprising: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis from the object side to the image plane; wherein...

[0006] The first lens has a convex object side and a convex image side.

[0007] The second lens has a convex object side and a convex image side.

[0008] The third lens has a concave side surface for the third object and a concave side surface for the third image.

[0009] The fourth lens has a convex side surface for its fourth object and a convex side surface for its fourth image.

[0010] The fifth lens has a concave side surface for its fifth object and a concave side surface for its fifth image.

[0011] The first, second, and fifth lenses are all positive lenses, while the third and fourth lenses are both negative lenses.

[0012] In this embodiment of the invention, the radius of curvature of the first object side is 35-40 mm, the radius of curvature of the first image side is -200 to -205 mm, the radius of curvature of the second object side is 30-35 mm, the radius of curvature of the second image side is -105 to -110 mm, the radius of curvature of the third object side is -105 to -110 mm, the radius of curvature of the third image side is 75-80 mm, the radius of curvature of the fourth object side is 90-95 mm, the radius of curvature of the fourth image side is -60 to -65 mm, the radius of curvature of the fifth object side is 90-95 mm, and the radius of curvature of the fifth image side is -60 to -65 mm.

[0013] In this embodiment of the invention, the radius of curvature of the first object side is 37.96 mm, the radius of curvature of the first image side is -202.8 mm, the radius of curvature of the second object side is 34.82 mm, the radius of curvature of the second image side is -106.3 mm, the radius of curvature of the third object side is -105.62 mm, the radius of curvature of the third image side is 78.3 mm, the radius of curvature of the fourth object side is 94.2 mm, the radius of curvature of the fourth image side is -64.8 mm, the radius of curvature of the fifth object side is 94.1 mm, and the radius of curvature of the fifth image side is -64.86 mm.

[0014] In this embodiment of the invention, the image side of the second lens is bonded to the object side of the third lens.

[0015] In this embodiment of the invention, the image side of the fourth lens is bonded to the object side of the fifth lens.

[0016] In this embodiment of the invention, the refractive index of the third and fifth lenses is 1.7 to 2.0.

[0017] In this embodiment of the invention, the refractive indices of the first lens, the second lens, and the fifth lens are 1.5 to 1.7.

[0018] In this embodiment of the invention, both the third and fifth lenses are high-refractive-index lenses.

[0019] In this embodiment of the invention, the fifth image side of the fifth lens is close to the image plane.

[0020] In this embodiment of the invention, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all made of glass.

[0021] Compared with the prior art, the advantages of this application are: simple structure, reasonable design, and use of five lenses to refract light through multiple lenses, so that the optics can be transmitted to the image chip on the side of the image to achieve a high-quality image, and shorten the overall length of the lens and improve the user experience of the lens. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the lens assembly in a telescope lens;

[0023] Figure 2 This is a schematic diagram of the lens assembly and light path refraction in a telescope lens.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. First lens; 11. First object side; 12. First image side; 2. Second lens; 21. Second object side; 22. Second object side; 3. Third lens; 31. Third object side; 32. Third object side; 4. Fourth lens; 41. Fourth object side; 42. Fourth object side; 5. Fifth lens; 51. Fifth object side; 52. Fifth object side; 6. Optical axis; 7. Image plane. Detailed Implementation

[0026] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings.

[0027] like Figure 1-2 As shown, a long focal length telescope lens includes: a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5 arranged sequentially along the optical axis 6 from the object side to the image plane 7; wherein...

[0028] The first lens 1 has a convex object side 11 and a convex image side 12;

[0029] The second lens 2 has a convex object side 21 and a convex image side 22.

[0030] The third lens 3 has a concave side surface 31 for the third object and a concave side surface 32 for the third image.

[0031] The fourth lens 4 has a convex fourth object side 41 and a convex fourth image side 42.

[0032] The fifth lens 5 has a fifth object side 51 that is concave and a fifth image side 52 that is concave.

[0033] The first lens 1, the second lens 2, and the fifth lens 5 are all positive lenses, while the third lens 3 and the fourth lens 4 are both negative lenses.

[0034] Specifically, the lens consists of five lenses arranged sequentially along the optical axis 6 from the object side to the image side. The first lens 1 is close to the object side, and the fifth lens 5 is close to the image side. The second lens 2, the third lens 3, and the fourth lens 4 are all positioned between the first lens 1 and the fifth lens 5. The first lens 1 is a positive lens to reduce the angle of light before transmitting it into the optical system. The second lens 2 is a positive lens cemented with the third lens 3, which is a high-refractive-index negative lens. Through the second lens 2 and the third lens 3, the angle of light is further reduced, and the chromatic aberration of the entire system is corrected. The fourth lens 4 is a high-refractive-index positive lens cemented with the fifth lens 5, which corrects spherical aberration and chromatic aberration of the system, and transmits the optics to the imaging chip. This enables shooting at long focal lengths with high image quality and high pixel count, while reducing the length and weight of the lens to meet the requirements of high imaging quality and reduced lens weight.

[0035] As a further embodiment provided by this utility model, the radius of curvature of the first object side 11 is 35-40 mm, the radius of curvature of the first image side 12 is -200 to -205 mm, the radius of curvature of the second object side 21 is 30-35 mm, the radius of curvature of the second image side 22 is -105 to -110 mm, the radius of curvature of the third object side 31 is -105 to -110 mm, the radius of curvature of the third image side 32 is 75-80 mm, the radius of curvature of the fourth object side 41 is 90-95 mm, the radius of curvature of the fourth image side 42 is -60 to -65 mm, the radius of curvature of the fifth object side 51 is 90-95 mm, and the radius of curvature of the fifth image side 52 is -60 to -65 mm. The above are the allowable deviations in the radius of curvature range of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5.

[0036] As a further embodiment provided by this utility model, the radius of curvature of the first object-side surface 11 is 37.96 mm, the radius of curvature of the first image-side surface 12 is -202.8 mm, the radius of curvature of the second object-side surface 21 is 34.82 mm, the radius of curvature of the second image-side surface 22 is -106.3 mm, the radius of curvature of the third object-side surface 31 is -105.62 mm, the radius of curvature of the third image-side surface 32 is 78.3 mm, the radius of curvature of the fourth object-side surface 41 is 94.2 mm, the radius of curvature of the fourth image-side surface 42 is -64.8 mm, the radius of curvature of the fifth object-side surface 51 is 94.1 mm, and the radius of curvature of the fifth image-side surface 52 is -64.86 mm. The radius of curvature is the distance between the vertex of the lens and the center of curvature, thus reflecting the degree of surface curvature of the lens. This lens consists of five groups of lenses, each of which is placed sequentially along the optical axis 6 at a suitable distance, thereby achieving high-quality images at long distances while reducing the length and weight of the lens.

[0037] As a further embodiment provided by this utility model, the image side of the second lens 2 is bonded to the object side of the third lens 3, the image side of the fourth lens 4 is bonded to the object side of the fifth lens 5, the fourth lens 4 and the fifth lens 5 are bonded together, and the second lens 2 and the third lens 3 are bonded together. By combining lenses with different optical properties, various aberrations, spherical aberrations, and chromatic aberrations are reduced, providing a clearer image quality. This reduces the number of internal components of the lens, thereby reducing the length and weight of the lens.

[0038] As a further embodiment provided by this utility model, the refractive indices of the third lens 3 and the fifth lens 5 are 1.7 to 2.0, the refractive index of the third lens 3 is 2.0, and the refractive index of the fifth lens 5 is 1.8.

[0039] As a further embodiment provided by this utility model, the refractive indices of the first lens 1, the second lens 2, and the fifth lens 5 are 1.5 to 1.7, wherein the refractive index of the first lens 1 is 1.6, the refractive index of the second lens 2 is 1.5, and the refractive index of the fourth lens 4 is 1.6.

[0040] As a further embodiment provided by this utility model, both the third lens 3 and the fifth lens 5 are high refractive index lenses. The refractive index of the third lens 3 is 2.0, while the refractive index of the fifth lens 5 is 1.8. The high refractive index lens improves the refraction effect of light, and the edge thickness of the lens can be reduced compared to the original, thereby reducing the weight of the lens.

[0041] As a further embodiment provided by this utility model, the fifth image side 52 of the fifth lens 5 is close to the image plane 7, and the fifth image side 52 is concave, thereby improving the refraction effect of light.

[0042] As a further embodiment provided by this utility model, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are all made of glass, thereby giving the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 high hardness and thinness, and achieving a high refractive index to meet high photography requirements.

[0043] The above-described technical solution of this utility model addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The parts not covered in this application's technical solution are the same as or can be implemented using existing technologies, and will not be described in detail here.

[0044] The technical solutions in the above embodiments have clearly and completely described the content of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A long focal length telescope lens, characterized in that, include: The first lens, the second lens, the third lens, the fourth lens, and the fifth lens are arranged sequentially along the optical axis from the object side to the image plane; in The first lens has a convex object side and a convex image side. The second lens has a convex object side and a convex image side. The third lens has a concave side surface for the third object and a concave side surface for the third image. The fourth lens has a convex side surface for its fourth object and a convex side surface for its fourth image. The fifth lens has a concave side surface for its fifth object and a concave side surface for its fifth image. The first, second, and fifth lenses are all positive lenses, while the third and fourth lenses are both negative lenses.

2. The long focal length telescope lens according to claim 1, characterized in that, The radius of curvature of the first object side is 35-40 mm, the radius of curvature of the first image side is -200 to -205 mm, the radius of curvature of the second object side is 30-35 mm, the radius of curvature of the second image side is -105 to -110 mm, the radius of curvature of the third object side is -105 to -110 mm, the radius of curvature of the third image side is 75-80 mm, the radius of curvature of the fourth object side is 90-95 mm, the radius of curvature of the fourth image side is -60 to -65 mm, the radius of curvature of the fifth object side is 90-95 mm, and the radius of curvature of the fifth image side is -60 to -65 mm.

3. A long focal length telescope lens according to claim 2, characterized in that, The radius of curvature of the first object side is 37.96 mm, the radius of curvature of the first image side is -202.8 mm, the radius of curvature of the second object side is 34.82 mm, the radius of curvature of the second image side is -106.3 mm, the radius of curvature of the third object side is -105.62 mm, the radius of curvature of the third image side is 78.3 mm, the radius of curvature of the fourth object side is 94.2 mm, the radius of curvature of the fourth image side is -64.8 mm, the radius of curvature of the fifth object side is 94.1 mm, and the radius of curvature of the fifth image side is -64.86 mm.

4. A long focal length telescope lens according to claim 1, characterized in that, The image side of the second lens is bonded to the object side of the third lens.

5. A long focal length telescope lens according to claim 1, characterized in that, The image side of the fourth lens is bonded to the object side of the fifth lens.

6. A long focal length telescope lens according to claim 1, characterized in that, The refractive indices of the third and fifth lenses are 1.7 to 2.

0.

7. A long focal length telescope lens according to claim 1, characterized in that, The refractive indices of the first, second, and fourth lenses are 1.5 to 1.

7.

8. A long focal length telescope lens according to claim 1, characterized in that, Both the third and fifth lenses are high-refractive-index lenses.

9. A long focal length telescope lens according to claim 1, characterized in that, The fifth image side of the fifth lens is close to the image plane.

10. A long focal length telescope lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all made of glass.

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