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Glass-plastic mixed prime lens

A fixed-focus lens and lens technology, applied in optics, instruments, optical components, etc., can solve the problems of many lenses, difficult aberration correction, and high cost

Pending Publication Date: 2019-08-30
DONGGUAN YUTONG OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, 4MP cameras widely used in the security field usually use a wide-angle security fixed-focus lens with a focal length of 2.8mm below FNO1.6. The lens has a large field of view and a large amount of light, which makes it difficult to correct aberrations. To ensure day and night confocality and high and low temperature without out of focus, usually at least 2 or more glass lenses are used, and more than 5 plastic aspheric lenses are used together, resulting in a large number of lenses in the fixed focus lens, which in turn increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Exemplarily, for the structure of the glass-plastic hybrid fixed-focus lens provided in Embodiment 1, please refer to figure 1 .

[0065] Specifically, the focal lengths of the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the overall lens in the glass-plastic hybrid fixed-focus lens, and the viewing angle of the fixed-focus lens on the 1 / 2.7-inch target surface CMOS The field angle and FNO are shown in Table 1 below.

[0066] Table I

[0067] f2 / f 3.5 f3 / f 1.7 f5 / f 1.2 f4 / f5 -0.9 Field of view 116.4 FNO 1.6

[0068] The structural parameters of the first lens 10 , the second lens 20 , the third lens 30 , the fourth lens 40 , the fifth lens 50 and the imaging plate 60 are shown in Table 2 below. Specifically, Table 2 shows the lens data arranged in order from the object side to the image side, including surface type, radius R (unit: mm), thickness D (unit: mm), refractive index N, and the co...

Embodiment 2

[0078] Figure 6 It is a structural schematic diagram of another glass-plastic hybrid fixed-focus lens provided by an embodiment of the present invention. For the structure of the glass-plastic mixed fixed-focus lens in the second embodiment, see Figure 6 .

[0079] Specifically, the focal lengths of the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the overall lens in the glass-plastic hybrid fixed-focus lens, and the viewing angle of the fixed-focus lens on the 1 / 2.7-inch target surface CMOS The field angle and FNO are shown in Table 4 below.

[0080] Table four

[0081]

[0082]

[0083] The structural parameters of the first lens 10 , the second lens 20 , the third lens 30 , the fourth lens 40 , the fifth lens 50 , the sixth lens and the imaging plate 60 are shown in Table 5 below. Specifically, Table 5 shows the lens data arranged in order from the object side to the image side, including the surface type, radius R (unit: mm), th...

Embodiment 3

[0094] Figure 11 It is a structural schematic diagram of another glass-plastic hybrid fixed-focus lens provided by an embodiment of the present invention. For the structure of the glass-plastic hybrid fixed-focus lens in Example 3, see Figure 11 .

[0095] Specifically, the focal lengths of the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, and the overall lens in the glass-plastic hybrid fixed-focus lens, and the viewing angle of the fixed-focus lens on the 1 / 2.7-inch target surface CMOS The field angle and FNO are shown in Table 7 below.

[0096] Table seven

[0097] f2 / f 5.0 f3 / f 2.0 f5 / f 30.7 f4 / f5 -1.0 Field of view 109.6 FNO 1.63

[0098] The structural parameters of the first lens 10 , the second lens 20 , the third lens 30 , the fourth lens 40 , the fifth lens 50 and the imaging plate 60 are shown in Table 8 below. Specifically, Table 8 shows the lens data arranged in order from the object s...

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Abstract

The invention discloses a glass-plastic mixed prime lens. The glass-plastic mixed prime lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, which are arranged inorder from an object side to an image side; wherein the third lens is a glass spherical lens, and the first lens, the second lens, the fourth lens and the fifth lens are all plastic aspherical lenses;the first lens is a convex-concave negative power lens, the second lens is a concave-convex positive power lens, the third lens is a biconvex positive power lens, the fourth lens is a convex-concaveor a biconcave negative power lens, and the fifth lens is a biconvex positive power lens; a ratio of focal lengths of the second lens, the third lens, the fourth lens and the fifth lens to the entirelens satisfies the following conditions: f2 / f is greater than 3 and less than 6; f3 / f is greater than 1.6 and less than 2; f5 / f is greater than 1 and less than 10; and f4 / f5 is greater than -1.1 and less than -0.65. By adopting the technical scheme provided by the embodiment of the invention, the performance of the prime lens is not affected while the cost is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of optical devices, in particular to a glass-plastic hybrid fixed-focus lens. Background technique [0002] With the improvement of people's safety awareness, there are higher-level requirements for security, and surveillance cameras are born. Compared with the zoom lens, the design and manufacture of the fixed-focus lens are simple, and the image of the moving object is clear and stable, and the picture is delicate, so that it occupies an important position in the security monitoring industry. [0003] At present, 4MP cameras widely used in the security field usually use a wide-angle security fixed-focus lens with a focal length of 2.8mm below FNO1.6. The lens has a large field of view and a large amount of light, which makes it difficult to correct aberrations. To ensure confocal day and night and no out-of-focus at high and low temperatures, it is usually necessary to use at least 2...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/18G02B1/00G02B1/04
CPCG02B13/0045G02B13/18G02B1/00G02B1/041
Inventor 张品光张磊何剑炜
Owner DONGGUAN YUTONG OPTICAL TECH
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