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Infrared confocal wide-angle lens

A wide-angle lens, infrared confocal technology, applied in the field of infrared confocal wide-angle lens, can solve the problems of peripheral vignetting, high production cost, and the finished product is not light enough, and achieves the effect of small temperature drift, good temperature performance and low production cost.

Active Publication Date: 2021-10-01
JIANGXI LIANCHUANG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current infrared confocal lenses used in vehicles and security systems generally have a large amount of infrared and visible defocus, and it is difficult to achieve high-definition requirements for daytime and night imaging at the same time. The cost is high, the temperature drift is large, the finished product is not light enough, and there are technical problems such as vignetting around

Method used

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  • Infrared confocal wide-angle lens
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  • Infrared confocal wide-angle lens

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0067] Please refer to the schematic structural diagram of the infrared confocal wide-angle lens provided by the embodiment of the present invention figure 1 , the infrared confocal wide-angle lens includes: first lens L1, second lens L2, stop ST, third lens L3, fourth lens L4, fifth lens L5, sixth lens from the object side to the imaging surface along the optical axis L6, and infrared filter G1.

[0068] The first lens L1 is a plastic aspheric lens with negative refractive power, the object side S1 is convex, and the image side S2 is concave;

[0069] The second lens L2 is a plastic aspheric lens with positive refractive power, the object side S3 is concave, and the image side S4 is convex;

[0070] The third lens L3 is a plastic aspheric lens with positive refractive power, and both the object side S5 and the image side S6 are convex;

[0071] The fourth lens L4 is a plastic aspheric lens with negative refractive power, and both the object side S7 and the image side S8 are...

no. 2 example

[0085] For the structural schematic diagram of the infrared confocal wide-angle lens provided by the embodiment of the present invention, please refer to Figure 5 , The structure of the infrared confocal wide-angle lens in this embodiment is roughly the same as that of the infrared confocal wide-angle lens in the first embodiment, the difference lies in the thickness of the lens, the pitch of the lens, the radius of curvature of the lens, and the like.

[0086] The relevant parameters of each lens in the infrared confocal wide-angle lens provided by the second embodiment of the present invention are shown in Table 3.

[0087] table 3

[0088]

[0089] The surface coefficients of each aspheric surface in the infrared confocal wide-angle lens provided by the second embodiment of the present invention are shown in Table 4.

[0090] Table 4

[0091]

[0092] In this example, please refer to Figure 6 , Figure 7 and Figure 8 , showing the visible light MTF curve, infr...

no. 3 example

[0096] Please refer to the schematic structural diagram of the infrared confocal wide-angle lens provided by the embodiment of the present invention Figure 9 , the infrared confocal wide-angle lens includes: first lens L1, second lens L2, stop ST, third lens L3, fourth lens L4, fifth lens L5, sixth lens from the object side to the imaging surface along the optical axis L6, and infrared filter G1.

[0097] The first lens L1 is a plastic aspheric lens with negative refractive power, the object side S1 is convex, and the image side S2 is concave;

[0098] The second lens L2 is a plastic aspheric lens with negative refractive power, the object side S3 is concave, and the image side S4 is convex;

[0099] The third lens L3 is a plastic aspheric lens with positive refractive power, and both the object side S5 and the image side S6 are convex;

[0100] The fourth lens L4 is a plastic aspheric lens with negative refractive power, and both the object side S7 and the image side S8 ar...

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Abstract

From an object side to an imaging surface along an optical axis, the lens comprises: a first lens with negative focal power, the object side surface of which is a convex surface and the image side surface of which is a concave surface; a second lens, wherein the object side surface is a concave surface, and the image side surface is a convex surface; a diaphragm; a third lens, wherein the object side surface and the image side surface are convex surfaces; a fourth lens, wherein the object side surface and the image side surface are concave surfaces; a fifth lens, whichhas positive focal power, wherein the object side surface and the image side surface are convex surfaces; a sixth lens, which has negative focal power, wherein the object side surface is a convex surface near the optical axis, and the image side surface is a concave surface near the optical axis. The infrared confocal wide-angle lens meets the conditional expressions that FOV is larger than or equal to 160 degrees and smaller than or equal to 180 degrees, and f / TTL is larger than 0.2 and smaller than 0.3, wherein FOV represents the maximum field angle of the infrared confocal wide-angle lens, f represents the effective focal length of the infrared confocal wide-angle lens, and TTL represents the distance from the object side face of the first lens to the imaging face on the optical axis.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to an infrared confocal wide-angle lens. Background technique [0002] Infrared confocal is currently the lens technical specification proposed by the vehicle and security industries, and it is the development trend of the future market. However, most of the current infrared confocal lenses used in vehicles and security systems generally have a large amount of infrared and visible defocus, and it is difficult to achieve high-definition requirements for daytime and night imaging at the same time. The cost is high, the temperature drift is large, the finished product is not light enough, and there are technical problems such as vignetting around. Contents of the invention [0003] The present application provides an infrared confocal wide-angle lens that is applicable to vehicle installation and can at least overcome at least one of the above-mentioned defects in the prior a...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/06G02B13/14G02B13/18
CPCG02B13/00G02B13/06G02B13/146G02B13/18G03B30/00
Inventor 陈伟建王俊晨曾吉勇
Owner JIANGXI LIANCHUANG ELECTRONICS CO LTD
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