Prime lens

A fixed-focus lens and lens technology, applied in the field of fixed-focus lenses, can solve problems such as increased cost and increased volume of the optical system, and achieve the effects of overcoming large expansion coefficients and reducing production costs

Pending Publication Date: 2022-05-10
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

However, in the design process of a large aperture lens, more glass lenses need to be installed to compensate each other, resulting in an increase in the volume of the optical system and an increase in cost

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0051] figure 1 It is a diagram schematically showing the structure of a fixed-focus lens according to Embodiment 1 of the present invention.

[0052] In Embodiment 1, the aperture FNO=1.07, the total length of the lens is 21.80mm, and the field of view is 162.20°.

[0053] The following table 3 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0054]

[0055]

[0056] table 3

[0057] In this embodiment, the aspheric surface data are shown in Table 4 below, where K is the quadric surface constant of the surface, and A 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The aspheric coefficients of the fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order and sixteenth order respectively:

[0058]

[0059] Table 4

Embodiment approach 2

[0061] figure 2 It is a diagram schematically showing the structure of a fixed-focus lens according to Embodiment 2 of the present invention.

[0062] In Embodiment 2, the aperture FNO=1.07, the total length of the lens is 22.07mm, and the field of view is 147.88°.

[0063] The following table 5 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0064] Face number surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd S1 Aspherical 27.03 1.00 1.54 55.71 S2 Aspherical 2.85 3.22 S3 Aspherical -4.45 1.41 1.64 23.53 S4 Aspherical -4.13 0.20 S5 Aspherical -29.37 0.97 1.64 23.53 S6 Aspherical 24.81 0.47 STO sphere Infinity -0.24 S8 Aspherical 23.30 1.58 1.66 20.38 S9 Aspherical -29.58 0.10 S10 sphere 30.11 0.58 1.73...

Embodiment approach 3

[0071] image 3 is a schematic diagram showing the structure of a fixed-focus lens according to Embodiment 3 of the present invention.

[0072] In Embodiment 3, the aperture FNO=1.07, the total length of the lens is 21.99mm, and the field of view is 164.55°.

[0073] The following table 7 lists the relevant parameters of each lens of this embodiment, including surface type, radius of curvature, thickness, refractive index of material, Abbe number:

[0074] Face number surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd S1 Aspherical 8.57 1.00 1.54 55.71 S2 Aspherical 2.46 2.89 S3 Aspherical -4.58 1.74 1.64 23.53 S4 Aspherical -4.15 0.23 S5 Aspherical -26.97 2.00 1.64 23.53 S6 Aspherical 20.45 0.64 STO sphere Infinity -0.58 S8 Aspherical 22.84 1.34 1.66 20.38 S9 Aspherical -48.55 0.10 S10 sphere 30.85 0.89 1.73 28.31 ...

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Abstract

The prime 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, an eighth lens 8 and a ninth lens 9 which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens 1 is a negative-focal-power lens, the second lens 2 is a positive-focal-power lens, the third lens 3 is a negative-focal-power lens, the fourth lens 4 is a positive-focal-power lens, the fifth lens 5 is a negative-focal-power lens, the sixth lens 6 is a positive-focal-power lens, the seventh lens 7 is a positive-focal-power lens, and the eighth lens 8 is a negative-focal-power lens. The ninth lens 9 is a positive focal power lens, and the fifth lens 5 and the sixth lens 6 are glued to form a glued lens. The prime lens provided by the invention has the characteristics of large aperture and large field of view, can realize no virtual focus in a temperature range of-40 DEG C to 85 DEG C, is more miniaturized, adopts the plastic aspherical lens, and reduces the production cost.

Description

technical field [0001] The invention relates to the field of optical imaging, in particular to a fixed-focus lens. Background technique [0002] At present, the small-sized fixed-focus lens in the security lens market generally requires an aperture of 1.6 / 2.4. In the field of security, we are gradually pursuing large aperture and ultra-wide-angle lenses, so that they can show better imaging effects under low illumination. However, in the design process of a large aperture lens, more glass lenses need to be installed to compensate each other, resulting in an increase in the volume of the optical system and an increase in cost. Therefore, designing a fixed-focus lens with large aperture, super wide angle, small size and low cost has become a market development trend. Contents of the invention [0003] The object of the present invention is to solve the above problems, and to provide a large aperture, super wide-angle fixed-focus lens. [0004] To achieve the above object,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18G02B13/06
CPCG02B13/0045G02B13/06G02B13/006
Inventor 张圆武梦婷
Owner 舜宇光学(中山)有限公司
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