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Infrared confocal lens and imaging equipment

An infrared confocal and lens technology, applied in the field of imaging lenses, can solve the problems of low cost, miniaturization market demand, large number of lenses, etc., and achieve excellent optical performance, small size, and the effect of correcting chromatic aberration

Active Publication Date: 2021-08-13
合肥联创光学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the surveillance lenses in the existing market are designed with all-glass lenses or a large number of lenses are used, which cannot well meet the market demand for low cost, miniaturization, and high resolution.

Method used

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  • Infrared confocal lens and imaging equipment
  • Infrared confocal lens and imaging equipment
  • Infrared confocal lens and imaging equipment

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0084] See figure 1 Representation shows the structure of the infrared coex lens 100 provided in the first embodiment of the present invention, the infrared CF lens 100, in order, in order: the first lens L1, the second lens L2, The aperture ST, the third lens L3, the fourth lens L4, and the filter G1.

[0085] The first lens L1 has a negative optical focus, and its object side surface S1 is a concave surface, and its image side S2 is a concave surface at the near-optical axis;

[0086] The second lens L2 has a positive optical focus, and the side surface S3 and the like side surface S4 are convex surfaces;

[0087] The third lens L3 has a positive optical focus, and its side surface S5 and the like side surface S6 are convex surfaces;

[0088] The fourth lens L4 has a negative optical power, and its object side surface S7 is a concave surface, and its image side surface S8 is a convex surface at the near-optical axis, and is a concave surface at the optical axis, i.e., the image ...

no. 2 example

[0100] See Figure 5 The schematic diagram of the structure of the infrared coex lens 200 provided in the second embodiment of the present invention, the structure of the infrared CF lens 200 in the second embodiment of the present invention is large to 100 infrared CF lenses in the first embodiment. The same, the difference is that the radius of curvature of each lens is different, and the relevant parameters of the specific individual lenses are shown in Table 3.

[0101] table 3

[0102]

[0103] The non-spherical parameters of the infrared CF lens 200 of the present embodiment are shown in Table 4.

[0104] Table 4

[0105]

[0106] In the present embodiment, the field of the infrared CF lens 200, in the MTF diagram of the visible optical band, and in the infrared band MTF map, respectively Image 6 , Figure 7 and Figure 8 Indicated.

[0107] Depend on Image 6 It can be seen that the field of the infrared coex lens 200 provided in this example does not exceed ± 0.06 mm in the ...

no. 3 example

[0110] See Figure 9 The schematic diagram of the structure of the infrared coex lens 300 provided in the third embodiment of the present invention, and the structure of the infrared CF lens 300 provided in the third embodiment of the present invention 100 is in the infrared CF lens 100 in the first embodiment. Againing the same, the difference is that the image side surface S8 of the fourth lens of the infrared CF lens 300 is a concave surface and is more easily processed. Further, the radius of curvature, thickness, and air interval of each lens are also different, and the specific parameters of the specific individual lenses are shown in Table 5.

[0111] table 5

[0112]

[0113] The non-spherical parameters of the infrared CF lens 300 of the present embodiment are shown in Table 6.

[0114] Table 6

[0115]

[0116] In the present embodiment, the field of infrared CF lens 300, the MTF diagram of the visible optical band and the infrared band MTF diagram, respectively, resp...

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Abstract

The invention discloses an infrared confocal lens and imaging equipment, and the infrared confocal lens sequentially comprises, from an object side to an imaging surface along an optical axis, a first lens with negative focal power, of which the object side surface is a concave surface, and the image side surface, nearby the optical axis, is a concave surface; a second lens with positive focal power, wherein the object side surface and the image side surface of the second lens are convex surfaces; a diaphragm; a third lens with positive focal power, wherein the object side surface and the image side surface of the third lens are convex surfaces; and a fourth lens with negative focal power, wherein the object side surface is a concave surface, and the image side surface is a concave surface or is a convex surface near the optical axis; wherein the second lens is a glass spherical lens, and the first lens, the third lens and the fourth lens are plastic aspherical lenses; the infrared confocal lens satisfies the following conditional expressions: Vd1 is greater than 50, Vd2 is greater than 50, Vd3 is greater than 50, and Vd4 is less than 30; wherein Vd1, Vd2, Vd3 and Vd4 represent Abbe numbers of the first lens, the second lens, the third lens and the fourth lens respectively. The infrared confocal lens has the advantages of low cost, miniaturization, good thermal stability and infrared confocal property.

Description

Technical field [0001] The present invention relates to the field of imaging lens, and more particularly to an infrared CF lens and an imaging device. Background technique [0002] With the continuous development of the Internet of Things technology and intelligent equipment, smart equipment is getting bigger and bigger to real-time monitoring while meeting everything. Real-time monitoring is a technique for real-time information transmission on the Internet of Things equipment. The application of this technology is very convenient for remote monitoring and management of Internet access. [0003] Infrared CF lenses, due to optical information in visible light and infrared bands, it is widely used in the Internet of Things equipment during the day at night. Considering that the equipment is in different environments indoor and outdoor, the high and low temperature also affects the focal plane, so the lens also needs conjunction at different temperatures. Most of the surveillance l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/14G02B13/18G02B1/00G02B1/04
CPCG02B1/00G02B1/041G02B13/004G02B13/008G02B13/14G02B13/18
Inventor 鲍宇旻曾吉勇
Owner 合肥联创光学有限公司