Super-large aperture telephoto lens optical system
By designing an ultra-large aperture telephoto lens optical system with a 6-piece lens structure, the problem of complex and high cost in the existing technology is solved, and an ultra-large aperture lens with a simple structure, low cost and suitable for mass production is realized, with good image quality and adaptability.
Patent Information
- Application Number
- CN202421990687.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-08-15
AI Technical Summary
Most existing photography objectives use complex structures, which leads to high development and later costs, making it difficult to popularize, and the demand for F0.8 ultra-large aperture lenses in the civil market has increased.
An ultra-large aperture telephoto lens optical system is designed, and a six-piece lens structure is arranged in sequence from object to image, including a first positive lens, a second negative lens, a third positive lens, a fourth positive lens, a fifth positive lens and a sixth negative lens. By optimizing the refractive index and Abbe number of the lens, the correction of spherical aberration, intelligent difference, astigmatism, and chromatic aberration are achieved.
It realizes a super-large aperture lens with a simple structure, low cost and suitable for mass production. It can achieve good image quality with only 6 lenses, and is suitable for aperture ranges within F0.8.
Smart Images
Figure CN222866948U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of optical systems, and in particular relates to an optical system of a super-large aperture telephoto lens. Background Art
[0002] At present, most photographic lenses use the Cooke three-piece structure and its improved structure. Among these structures, most are small and medium aperture lenses, and a small number of F0.8 large aperture lens structures use more than 7 lenses or aspherical lenses, which leads to high development and post-production costs and are difficult to popularize. In order to meet the needs of night photography, the civilian market has an increasing demand for F0.8 ultra-large aperture lenses. As a result, this ultra-large aperture lens with a relatively simple structure, relatively low cost, and mass production has been developed. Utility Model Content
[0003] The utility model aims to solve the above technical problems at least to a certain extent. To this end, the utility model aims to provide a super-large aperture telephoto lens optical system.
[0004] The technical solution adopted by the utility model is:
[0005] A super-large aperture telephoto lens optical system comprises a first positive lens, a second negative lens, a third positive lens, a fourth positive lens, a fifth positive lens and a sixth negative lens which are arranged in sequence from the object side to the image side, wherein the refractive index ND of the first positive lens is 1.56-1.66, and the Abbe number VD is 58-65; the refractive index ND of the second negative lens is 1.7-1.83, and the Abbe number VD is 23-33; the refractive index ND of the third positive lens is 1.56-1.66, and the Abbe number VD is 58-65; the refractive index ND of the fourth positive lens is 1.56-1.66, and the Abbe number VD is 58-65; the refractive index ND of the fifth positive lens is 1.72-1.82, and the Abbe number VD is 46-52; the refractive index ND of the sixth negative lens is 1.8-1.86, and the Abbe number VD is 22-25.
[0006] Preferably, the radius of curvature of the first surface of the first positive lens is 29-33 mm, and the semi-clear aperture is 12-16 mm; the radius of curvature of the second surface of the first positive lens is 500-2000 mm, and the semi-clear aperture is 12-16 mm.
[0007] Preferably, the radius of curvature of the first surface of the second negative lens is -34 to -37 mm, and the semi-clear aperture is 12 to 16 mm; the radius of curvature of the second surface of the first positive lens is -200 to -250 mm, and the semi-clear aperture is 12 to 16 mm.
[0008] Preferably, the radius of curvature of the first surface of the third positive lens is 29.5 to 31.5 mm, and the semi-clear aperture is 11 to 13.5 mm; the radius of curvature of the second surface of the first positive lens is -210 to -250 mm, and the semi-clear aperture is 11 to 13.5 mm.
[0009] Preferably, the radius of curvature of the first surface of the fourth positive lens is 30-31 mm, and the semi-clear aperture is 10-12 mm; the radius of curvature of the second surface of the first positive lens is -100--110 mm, and the semi-clear aperture is 10-12 mm.
[0010] Preferably, the radius of curvature of the first surface of the fifth positive lens is 17-18 mm, and the semi-clear aperture is 7-9 mm; the radius of curvature of the second surface of the first positive lens is 100-110 mm, and the semi-clear aperture is 7-9 mm.
[0011] Preferably, the radius of curvature of the first surface of the sixth negative lens is -101 to -109 mm, and the semi-clear aperture is 6.5 to 8.5 mm; the radius of curvature of the second surface of the first positive lens is 11.8 to 12.9 mm, and the semi-clear aperture is 4 to 6 mm.
[0012] The beneficial effects of the utility model are:
[0013] The utility model provides an ultra-large aperture telephoto lens optical system, which has a simple structure, low cost, and is suitable for mass production. It uses only 6 lenses to correct spherical aberration, coma, astigmatism, and chromatic aberration, so that the lens has good image quality within a large aperture of F0.8. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the optical system of the super-large aperture telephoto lens of the utility model.
[0015] Figure 2 It is a parameter diagram of the optical system of the super-large aperture telephoto lens of the utility model.
[0016] In the figure: 1-first positive lens; 2-second negative lens; 3-third positive lens; 4-fourth positive lens; 5-fifth positive lens; 6-sixth negative lens. DETAILED DESCRIPTION
[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention. The components of the embodiments of the present invention generally described and shown in the accompanying drawings herein can be arranged and designed in a variety of different configurations.
[0018] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.
[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0020] like Figure 1 and Figure 2 As shown, an ultra-large aperture telephoto lens optical system of the present embodiment is improved on the basis of the Cooke three-piece structure, and achieves ultra-large aperture, large field of view, and excellent imaging quality with the least number of lenses and the simplest structure; the optical system includes a first positive lens 1, a second negative lens 2, a third positive lens 3, a fourth positive lens 4, a fifth positive lens 5, and a sixth negative lens 6 which are arranged in sequence from the object side to the image side, and a light beam from the object side passes through the first positive lens 1, the second negative lens 2, the third positive lens 3, the fourth positive lens 4, the fifth positive lens 5, and the sixth negative lens 6 in sequence to reach the image side, and an image is formed on the image side.
[0021] The refractive index ND of the first positive lens 1 is 1.56-1.66, and the Abbe number VD is 58-65; the refractive index ND of the second negative lens 2 is 1.7-1.83, and the Abbe number VD is 23-33; the refractive index ND of the third positive lens 3 is 1.56-1.66, and the Abbe number VD is 58-65; the refractive index ND of the fourth positive lens 4 is 1.56-1.66, and the Abbe number VD is 58-65; the refractive index ND of the fifth positive lens 5 is 1.72-1.82, and the Abbe number VD is 46-52; the refractive index ND of the sixth negative lens 6 is 1.8-1.86, and the Abbe number VD is 22-25.
[0022] like Figure 2As shown, the first surface of the first positive lens 1 is R1, and the second surface is R2; the first surface of the second negative lens 2 is R3, and the second surface is R4; the first surface of the third positive lens 3 is R5, and the second surface is R6; the first surface of the fourth positive lens 4 is R7, and the second surface is R8; the first surface of the fifth positive lens 5 is R9, and the second surface is R10, the first surface of the sixth negative lens 6 is R11, and the second surface is R12; the thickness of the first positive lens 1 is D1, the air gap between the first positive lens 1 and the second negative lens 2 is D2, the thickness of the second negative lens 2 is D3, the air gap between the second negative lens 2 and the third positive lens 3 is D4, the thickness of the third positive lens 3 is D5, the air gap between the third positive lens 3 and the fourth positive lens 4 is D6, the thickness of the fourth positive lens 4 is D7, the air gap between the fourth positive lens 4 and the fifth positive lens 5 is D8, the thickness of the fifth positive lens 5 is D9, the air gap between the fifth positive lens 5 and the sixth negative lens 6 is D10, and the thickness of the sixth negative lens 6 is D11.
[0023] Specifically, the radius of curvature of the first surface of the first positive lens 1 is 29 to 33 mm, and the semi-clear aperture is 12 to 16 mm; the radius of curvature of the second surface of the first positive lens 1 is 500 to 2000 mm, and the semi-clear aperture is 12 to 16 mm. The radius of curvature of the first surface of the second negative lens 2 is -34 to -37 mm, and the semi-clear aperture is 12 to 16 mm; the radius of curvature of the second surface of the first positive lens 1 is -200 to -250 mm, and the semi-clear aperture is 12 to 16 mm. The radius of curvature of the first surface of the third positive lens 3 is 29.5 to 31.5 mm, and the semi-clear aperture is 11 to 13.5 mm; the radius of curvature of the second surface of the first positive lens 1 is -210 to -250 mm, and the semi-clear aperture is 11 to 13.5 mm. The radius of curvature of the first surface of the fourth positive lens 4 is 30 to 31 mm, and the semi-clear aperture is 10 to 12 mm; the radius of curvature of the second surface of the first positive lens 1 is -100 to -110 mm, and the semi-clear aperture is 10 to 12 mm. The radius of curvature of the first surface of the fifth positive lens 5 is 17 to 18 mm, and the semi-clear aperture is 7 to 9 mm; the radius of curvature of the second surface of the first positive lens 1 is 100 to 110 mm, and the semi-clear aperture is 7 to 9 mm. The radius of curvature of the first surface of the sixth negative lens 6 is -101 to -109 mm, and the semi-clear aperture is 6.5 to 8.5 mm; the radius of curvature of the second surface of the first positive lens 1 is 11.8 to 12.9 mm, and the semi-clear aperture is 4 to 6 mm.
[0024] More parameters of each lens are shown in Table 1.
[0025] Table 1 Lens parameters
[0026]
[0027] The design parameters of the super-large aperture telephoto lens optical system of this embodiment are: focal length 25mm, FNO: 0.8-8, diffuse spot diameter less than 5.5um, maximum imaging chip 1 / 1.8, relative light transmission greater than 81%, and uniform image quality. It has a wide spectral range of 400nm-1100nm, and has good imaging effects both during the day and at night; the maximum aperture of the system reaches F0.8.
[0028] The present utility model is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present utility model fall within the protection scope of the present utility model.
Claims
1. An ultra-large aperture telephoto lens optical system, characterized in that: The invention comprises a first positive lens (1), a second negative lens (2), a third positive lens (3), a fourth positive lens (4), a fifth positive lens (5) and a sixth negative lens (6) which are arranged in sequence from the object side to the image side. The refractive index ND of the first positive lens (1) is 1.56-1.66, and the Abbe number VD is 58-65; the refractive index ND of the second negative lens (2) is 1.7-1.83, and the Abbe number VD is 23-33; the refractive index ND of the third positive lens (3) is 1.56-1.66, and the Abbe number VD is 58-65; the refractive index ND of the fourth positive lens (4) is 1.56-1.66, and the Abbe number VD is 58-65; the refractive index ND of the fifth positive lens (5) is 1.72-1.82, and the Abbe number VD is 46-52; the refractive index ND of the sixth negative lens (6) is 1.8-1.86, and the Abbe number VD is 22-25.
2. The ultra-large aperture telephoto lens optical system according to claim 1, characterized in that: The first surface of the first positive lens (1) has a curvature radius of 29 to 33 mm, and a semi-clear aperture of 12 to 16 mm; the second surface of the first positive lens (1) has a curvature radius of 500 to 2000 mm, and a semi-clear aperture of 12 to 16 mm.
3. The ultra-large aperture telephoto lens optical system according to claim 1, characterized in that: The first surface of the second negative lens (2) has a curvature radius of -34 to -37 mm, and a semi-clear aperture of 12 to 16 mm; the second surface of the first positive lens (1) has a curvature radius of -200 to -250 mm, and a semi-clear aperture of 12 to 16 mm.
4. The ultra-large aperture telephoto lens optical system according to claim 1, characterized in that: The first surface of the third positive lens (3) has a curvature radius of 29.5 to 31.5 mm, and a semi-clear aperture of 11 to 13.5 mm; the second surface of the first positive lens (1) has a curvature radius of -210 to -250 mm, and a semi-clear aperture of 11 to 13.5 mm.
5. The ultra-large aperture telephoto lens optical system according to claim 1, characterized in that: The first surface of the fourth positive lens (4) has a curvature radius of 30 to 31 mm, and a semi-clear aperture of 10 to 12 mm; the second surface of the first positive lens (1) has a curvature radius of -100 to -110 mm, and a semi-clear aperture of 10 to 12mm.
6. The ultra-large aperture telephoto lens optical system according to claim 1, characterized in that: The first surface of the fifth positive lens (5) has a curvature radius of 17-18 mm and a semi-clear aperture of 7-9 mm; the second surface of the first positive lens (1) has a curvature radius of 100-110 mm and a semi-clear aperture of 7-9 mm.
7. The ultra-large aperture telephoto lens optical system according to claim 1, characterized in that: The first surface of the sixth negative lens (6) has a curvature radius of -101 to -109 mm, and a semi-clear aperture of 6.5 to 8.5 mm; the second surface of the first positive lens (1) has a curvature radius of 11.8 to 12.9 mm, and a semi-clear aperture of 4 to 6 mm.