Horizontal 200-degree fisheye lens

Abstract

The utility model belongs to the technical field of optical systems, and discloses a horizontal 200-degree fisheye lens, which comprises a first glass lens, a second glass lens, a third glass lens, a fourth glass lens, a fifth glass lens, a sixth glass lens and a seventh glass lens which are sequentially arranged from an object space to an image space, the focal lengths of the glass lenses are positive, positive, negative, positive, negative, negative and negative; and a diaphragm is arranged between the fourth glass lens and the fifth glass lens. According to the fisheye lens provided by the utility model, a large angle can be realized through the cooperation of the plurality of lenses; through the limitation of parameters and the structure, the high pixel of the lens is realized, and the small-focal-length shooting can be realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to optical system technical field, concretely relates to a horizontal 200 degrees fisheye lens. BACKGROUND

[0002] At present, there are some new requirements for lenses in the field of automobiles, such as high definition and large angle, and new requirements for lenses in iteration after iteration, such as miniaturization and high pixels, and the total length is small, how to realize these requirements is a problem to be solved at present. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at solving the above technical problems at least to some extent.

[0004] The utility model adopts the technical scheme of:

[0005] A horizontal 200 degrees fisheye lens, including first glass lens, second glass lens, third glass lens, fourth glass lens, fifth glass lens, sixth glass lens and seventh glass lens arranged in sequence from object side to image side, the focal length of glass lens is positive, positive, negative, positive, negative, negative, negative in turn; the fourth glass lens and the fifth glass lens are provided with a diaphragm.

[0006] Preferably, the optical distortion of the fisheye lens is within-10%, and the TV distortion is less than 1%.

[0007] Preferably, the curvature radius of the first surface of the first glass lens is 11.85-12mm, and the curvature radius of the second surface is 6.32-6.47mm.

[0008] Preferably, the curvature radius of the first surface of the second glass lens is 10.6-10.75mm, and the curvature radius of the second surface is 1.95-2.1mm.

[0009] Preferably, the curvature radius of the first surface of the third glass lens is-11.54--11.69mm, and the curvature radius of the second surface is-6.01--6.16mm.

[0010] Preferably, the curvature radius of the first surface of the fourth glass lens is 6.58-6.73mm, and the curvature radius of the second surface is 1.55-1.7mm.

[0011] Preferably, the curvature radius of the first surface of the fifth glass lens is 4.12-4.27mm, and the curvature radius of the second surface is-2.5--2.65mm.

[0012] Preferably, the radius of curvature of the first surface of the sixth glass lens is 7.4-7.55mm.

[0013] Preferably, the radius of curvature of the first surface of the seventh glass lens is -1.86--2.01mm, and the radius of curvature of the second surface is -5.89--6.01mm.

[0014] The utility model discloses a beneficial effect is:

[0015] The utility model provides a horizontal 200 degrees' fish -eye lens, through the cooperation of a plurality of lenses, can realize big angle, through the limitation of parameter and structure, has realized this lens high pixel, still can realize the shooting of smaller focal length, has increased the experience of user. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the schematic diagram of the curvature radius of the horizontal 200 degrees' fish -eye lens of the utility model.

[0017] Figure 2 It is the schematic diagram of the curvature radius of the horizontal 200 degrees' fish -eye lens of the utility model.

[0018] Figure 3 It is the Mtf graph of the horizontal 200 degrees' fish -eye lens of the utility model.

[0019] Figure 4 It is the Mtf focusing curve graph of the horizontal 200 degrees' fish -eye lens of the utility model.

[0020] Figure 5 It is the dot matrix of the horizontal 200 degrees' fish -eye lens of the utility model.

[0021] Figure 6 It is the relative diagram of the horizontal 200 degrees' fish -eye lens of the utility model.

[0022] In the drawing: 1-first glass lens;2-second glass lens;3-third glass lens;4-fourth glass lens;5-fifth glass lens;6-sixth glass lens;7-seventh glass lens;8-diaphragm. DETAILED DESCRIPTION

[0023] The embodiments of the utility model are described in detail below, the example of the embodiment is shown in the drawing, wherein the same or similar reference signs show the same or similar elements or elements with the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the utility model, and cannot be understood as the limitation of the utility model. The components of the utility model embodiments described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on terms should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be the communication inside two elements.

[0025] The utility model will be further explained in connection with the drawings and specific embodiments.

[0026] As Figure 1 The utility model discloses a horizontal 200-degree fish-eye lens, which comprises first glass lens 1, second glass lens 2, third glass lens 3, fourth glass lens 4, fifth glass lens 5, sixth glass lens 6 and seventh glass lens 7 arranged in sequence from an object side to an image side, and the focal lengths of the glass lenses are positive, positive, negative, positive, negative, negative and negative in sequence; and a diaphragm 8 is arranged between the fourth glass lens 4 and the fifth glass lens 5.

[0027] The fourth glass lens 4 and the fifth glass lens 5 correct distortion and CRA to a certain extent. The first glass lens 1, the second glass lens 2, the third glass lens 3, the fourth glass lens 4, the fifth glass lens 5, the sixth glass lens 6 and the seventh glass lens 7 are combined in an even aspheric surface mode, so that spherical aberration, coma, astigmatism, field curvature and other aberrations can be effectively corrected, the resolving power of the lens is improved, the aberrations are reduced by matching the dispersion coefficients, the image quality is further improved by using a high-precision plastic lens barrel, and thus the ideal resolving power is achieved.

[0028] As Figure 2As shown, the first glass lens 1 has a first face with a radius of curvature R1 of 11.85-12 mm and a second face with a radius of curvature R2 of 6.32-6.47 mm. The second glass lens 2 has a first face with a radius of curvature R3 of 10.6-10.75 mm and a second face with a radius of curvature R4 of 1.95-2.1 mm. The third glass lens 3 has a first face with a radius of curvature R5 of -11.54--11.69 mm and a second face with a radius of curvature R6 of -6.01--6.16 mm. The fourth glass lens 4 has a first face with a radius of curvature R7 of 6.58-6.73 mm and a second face with a radius of curvature R8 of 1.55-1.7 mm. The fifth glass lens 5 has a first face with a radius of curvature R10 of 4.12-4.27 mm and a second face with a radius of curvature R11 of -2.5--2.65 mm. The sixth glass lens 6 has a first face with a radius of curvature R12 of 7.4-7.55 mm. The seventh glass lens 7 has a first face with a radius of curvature R13 of -1.86--2.01 mm and a second face with a radius of curvature R14 of -5.89--6.01 mm. The diaphragm is planar and has an infinite radius of curvature.

[0029] Further parameters of the lenses are shown in Table 1.

[0030] Table 1 Lens Parameters

[0031] Surface number Surface type Radius of curvature Thickness / distance Refractive index Dispersion coefficient S1 Standard surface 11.85～12.00 1.07～1.22 1.624～1.802 52.946～55.996 S2 Standard surface 6.32～6.47 1.04～1.19 S3 Standard surface 10.60～10.75 0.48～0.63 1.624～1.802 52.946～55.996 S4 Standard surface 1.95～2.10 2.47～2.62 S5 Standard surface -11.54～-11.69 1.60～1.75 1.8513～1.971 21.312～23.392 S6 Standard surface -6.01～-6.16 0.01～0.16 S7 Standard surface 6.58～6.73 0.48～0.63 1.524～1.593 59.946～62.996 S8 Standard surface 1.55～1.70 0.25～0.4 ST0 Standard surface Infinite 0.05～0.20 S10 Standard surface 4.12～4.27 3.07～3.23 1.629～1.759 50.508～51.568 S11 Standard surface -2.50～-2.65 0.02～0.17 S12 Standard surface 7.40～7.55 2.31～2.46 1.629～1.959 55.946～57.996 S13 Standard surface -1.86～-2.01 0.82～0.97 1.8946～2..996 17.746～19.996 S14 Standard surface -5.89～-6.01 0.03～0.18

[0032] The fisheye lens of the present embodiment is a fixed focus lens with a focal length of 1.0-1.2, an aperture of 2.0-2.2, and a total length of 16-18, while also ensuring high resolution; temperature compensation design is used to operate in an environment of -40°C to +80°C without defocus; positive and negative lens power are used to compensate for each other, not only ensuring the performance of the optical system, but also reducing the cost of part processing, simplifying the structure, reducing the weight, and being conducive to mass production, meeting market demand; while using low dispersion materials, the image quality of the picture can also be improved.

[0033] The fisheye lens of the present embodiment is best for imaging at a wavelength of 400-700 nm, while also being low distortion. The optical distortion is within -10%, and the TV distortion is less than 1%. The specific test results are shown in Table 2. Figures 4 to 6

[0034] The utility model is not limited to the above optional implementation, anyone can draw other various forms of products under the enlightenment of the utility model, but no matter make any change in its shape or structure, any technical scheme falling within the scope defined by the claims of the utility model falls within the protection scope of the utility model.​

Claims

1. A fisheye lens with a horizontal 200 degrees, characterized in that: The first glass lens (1), the second glass lens (2), the third glass lens (3), the fourth glass lens (4), the fifth glass lens (5), the sixth glass lens (6) and the seventh glass lens (7) are sequentially arranged from the object side to the image side, the focal lengths of the glass lenses are positive, positive, negative, positive, negative, negative and negative in turn, and a diaphragm (8) is arranged between the fourth glass lens (4) and the fifth glass lens (5).

2. The fisheye lens according to claim 1, characterized in that: The optical distortion of the fisheye lens is within -10%, and the TV distortion is less than 1%.

3. The fisheye lens of claim 1, wherein: The curvature radius of the first surface of the first glass lens (1) is 11.85-12 mm, and the curvature radius of the second surface is 6.32-6.47 mm.

4. The fisheye lens of claim 1, wherein: The curvature radius of the first surface of the second glass lens (2) is 10.6-10.75 mm, and the curvature radius of the second surface is 1.95-2.1 mm.

5. The fisheye lens of claim 1, wherein: The curvature radius of the first surface of the third glass lens (3) is -11.54--11.69 mm, and the curvature radius of the second surface is -6.01--6.16 mm.

6. The fisheye lens of claim 1, wherein: The curvature radius of the first surface of the fourth glass lens (4) is 6.58-6.73 mm, and the curvature radius of the second surface is 1.55-1.7 mm.

7. The fisheye lens of claim 1, wherein: The curvature radius of the first surface of the fifth glass lens (5) is 4.12-4.27 mm, and the curvature radius of the second surface is -2.5--2.65 mm.

8. The fisheye lens of claim 1, wherein: The curvature radius of the first surface of the sixth glass lens (6) is 7.4-7.55 mm.

9. The fisheye lens of claim 1, wherein: The curvature radius of the first surface of the seventh glass lens (7) is -1.86--2.01 mm, and the curvature radius of the second surface is -5.89--6.01 mm.

Images