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Fixed-focus lens

A fixed-focus lens and lens technology, applied in the field of fixed-focus lenses, can solve the problems of large aberration, increased cost, and increased volume of the optical system, and achieves the effect of broadening the use environment

Pending Publication Date: 2019-11-12
舜宇光学(中山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the larger the aperture, the greater the aberration caused by the position of the large field of view. Therefore, in order to correct the aberration, it is necessary to set up more lenses to compensate each other, resulting in an increase in the volume of the optical system, and the cost also increases. Increase
And because increasing the aperture will be accompanied by the problem of small depth of focus, it is difficult to balance the performance of infrared and high and low temperature. Therefore, it is necessary to design a fixed camera with large aperture, small volume, low cost, confocal day and night, and stable high and low temperature performance. Focal lens becomes the market development trend

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] figure 1 It is a diagram schematically showing the structure of the fixed-focus lens optical system according to Embodiment 1 of the present invention. The parameters of the fixed-focus lens in Embodiment 1 are as follows: TTL=24.848mm; FNO=1.2; EFL=4.204.

[0068] The following table 2 lists the relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0069] Face number surface type radius of curvature thickness Refractive index Abbe number S1 sphere -78.366 0.568 1.589 61.247 S2 sphere 5.086 3.004 S3 Aspherical -4.265 2.501 1.5443 55.132 S4 Aspherical -4.964 0.113 S5 Aspherical 8.305 2.105 1.66 23.369 S6 Aspherical 10.512 2.766 S7 STO INF -0.340 S8 sphere 12.167 3.011 1.592 68.525 S9 sphere -5.517 0.606 1.846 23.787 S10 sphere -17.650 0.128 ...

Embodiment 2

[0078] Figure 8 It is a diagram schematically showing the structure of the fixed-focus lens optical system according to Embodiment 2 of the present invention. The parameters of the fixed-focus lens in Embodiment 2 are as follows: TTL=24.999mm; FNO=1.21; EFL=4.739.

[0079] The following table 4 lists the relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0080]

[0081]

[0082] Table 4

[0083] In combination with Table 1 and Table 4, in Embodiment 2, the focal length value f of the fourth lens L4 is: 8.512, the focal length value f of the fifth lens L5 is: -9.534. The focal length f of the seventh lens L7 is: 42.362, and the focal length fL8 of the eighth lens is: -34.777. | f L4 / f L5 |=0.893, |f L7 / f L8 |=1.218. The focal length value f of the second lens in embodiment 2 L2 is: 194.952, the focal length value of the third lens f L3 For: 41.071....

Embodiment 3

[0091] Figure 15 It is a diagram schematically showing the structure of the optical system of the fixed-focus lens according to Embodiment 3 of the present invention. The parameters of the fixed-focus lens in Embodiment 3 are as follows: TTL=24.992mm; FNO=1.15; EFL=4.215.

[0092] The following table 6 lists the relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0093] Face number surface type radius of curvature thickness Refractive index Abbe number S1 sphere 81.240 0.525 1.437 95.100 S2 sphere 5.081 3.430 S3 Aspherical -4.233 2.411 1.568 62.960 S4 Aspherical -5.124 0.100 S5 Aspherical 8.364 2.015 1.660 20.369 S6 Aspherical 9.480 2.908 S7 STO INF -0.379 S8 sphere 12.389 3.055 1.463 90.315 S9 sphere -5.667 0.526 1.846 23.787 S10 sphere -16.953...

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Abstract

The invention relates to a fixed-focus lens. The fixed-focus lens comprises a first lens (1), a second lens (2), a third lens (3), a diaphragm (S), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7) and an eighth lens (8), which are sequentially arranged along the optical axis from the object side to the image side; the fixed-focus lens is characterized in that the first lens (1), the fourth lens (4), the fifth lens (5) and the sixth lens (6) are glass lenses; the second lens (2) and the third lens (3) are glass lenses or plastic lenses; the seventh lens (7) and the eighth lens (8) are plastic lenses; and the fixed-focus lens at least comprise three lenses having negative focal power. The fixed-focus lens in the invention has the advantages of being large in diaphragm, small in volume, low in cost, confocal day and light and steady in high and low temperature performance.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a fixed-focus lens. Background technique [0002] With the rapid development of technology, the requirements for optical lenses are getting higher and higher. At present, the small-sized fixed-focus lens on the market basically has an aperture between 1.6 and 2.4, and a larger aperture can pass through more light under the same illuminance environment, thereby making the image surface brighter. It can also show better imaging effects under low illumination, so at present, fixed-focus lenses are increasingly pursuing large apertures. [0003] However, the larger the aperture, the greater the aberration caused by the position of the large field of view. Therefore, in order to correct the aberration, it is necessary to set up more lenses to compensate each other, resulting in an increase in the volume of the optical system, and the cost also increases. Increase. And becau...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/18G02B13/06
CPCG02B13/0045G02B13/18G02B13/006G02B13/06
Inventor 张巧鸽贺保丁蓝岚梁伟朝邹文镔
Owner 舜宇光学(中山)有限公司
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