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Glass and plastic mixed fixed-focus 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: 2019-09-06
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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  • Glass and plastic mixed fixed-focus lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Exemplarily, for the structure of the glass-plastic hybrid fixed-focus lens provided in Embodiment 1, please refer to figure 1 .

[0063] Specifically, the focal lengths of the second lens 20, the fourth lens 40, the fifth lens 50, the sixth lens 60 and the overall lens in the glass-plastic hybrid fixed-focus lens, and the focal length of the fixed-focus lens under the 1 / 2.7-inch target surface CMOS The field of view and FNO are shown in Table 1 below.

[0064] Table I

[0065]

[0066]

[0067] 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 60 and the imaging plate 70 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 cone of the best fitting cone Coefficient K, serial numbers 1 and 2 are the...

Embodiment 2

[0077] 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 hybrid fixed-focus lens in Example 2, see Figure 6 .

[0078] Specifically, the focal lengths of the second lens 20, the fourth lens 40, the fifth lens 50, the sixth lens 60 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.

[0079] Table four

[0080]

[0081]

[0082] 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 60 and the imaging plate 70 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), thickness D...

Embodiment 3

[0093] 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 .

[0094] Specifically, the focal lengths of the second lens 20, the fourth lens 40, the fifth lens 50, the sixth lens 60 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.

[0095] Table seven

[0096] f2 / f 4.7 f4 / f 2.5 f5 / f6 -1.0 Field of view 135.0 FNO 1.6

[0097] 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 60 and the imaging plate 70 are shown in Table 8 below. Specifically, Table 8 shows the lens data arranged in order from the object...

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Abstract

The invention discloses a glass and plastic mixed fixed-focus lens. The glass and plastic mixed fixed-focus lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and asixth lens, which are sequentially arranged from the object side to the image side, wherein the fourth lens is a glass spherical lens; the first lens, the second lens, the third lens, the fifth lens and the sixth lens are plastic aspheric lenses; the first lens is a convex-concave negative focal lens; the second lens is a convex-concave positive focal lens; the third lens is a convex-concave lens;the fourth lens is a double-convex positive focal lens; the fifth lens is a double-concave negative focal lens; the sixth lens is a double-convex positive focal lens; and the focal length ratio of the second lens, the fourth lens, the fifth lens and the sixth lens to the whole lens satisfies the following condition: a formula as shown in the specification. According to the technical scheme provided in the embodiment of the invention, the performance of the fixed-focus lens is not influenced 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): G02B13/18G02B1/04G02B1/00
CPCG02B13/0045G02B1/041G02B1/00
Inventor 张品光张磊何剑炜
Owner DONGGUAN YUTONG OPTICAL TECH
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