Unlock instant, AI-driven research and patent intelligence for your innovation.

Small-size long-focal-length infrared confocal optical lens

An infrared confocal and optical lens technology, applied in the field of optical lenses, can solve the problems of low resolution, affecting performance, and large size, and achieve the effects of good imaging quality, reduced sensitivity, and high resolution

Pending Publication Date: 2021-10-15
JIANGXI PHENIX OPTICS TECH CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the lenses currently used in security systems have the following defects: 1) The focal length is short, and it is difficult to realize long-distance monitoring; 2) The F number is greater than 2.0, the aperture is small, the resolution is low, and it is greatly affected by temperature, so it cannot be applied to complex environments; 3) There are problems such as serious purple fringing, poor imaging at the edge of the field of view, and poor day and night confocal effects. In order to improve performance, more lenses are usually used to improve image quality. Due to the complexity of the processing technology, it is difficult to guarantee the processing accuracy. As a result, the performance is affected, and the size is larger, the cost is higher, and it is easy to be limited by the installation space

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Small-size long-focal-length infrared confocal optical lens
  • Small-size long-focal-length infrared confocal optical lens
  • Small-size long-focal-length infrared confocal optical lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Lens parameter is as shown in table 1 in the present embodiment:

[0067] Table 1

[0068]

[0069]

[0070] The first lens L1, the second lens L2, the fourth lens L4 and the fifth lens L5 are aspheric lenses, and the parameters of each aspheric mirror surface satisfy Table 2:

[0071] Table 2

[0072] Face number k α 4

[0073] According to the above data, by figure 2 As shown, the lens satisfies the requirement of clear 2um*2um pixel imaging at the limit resolution of 200lp / mm. Depend on figure 2 , 3 As shown in and 4, the lens has an MTF defocus of 3 μm under the limit conditions of room temperature 20°C, low temperature -30°C, and high temperature 70°C, which basically has no effect on image quality. It has strong temperature adaptability and can work normally at different temperatures with stable performance. . Depend on Figure 5 , Image 6 As shown, under the visible light or 850nm near-infrared light environment, the out-of-focus amo...

Embodiment 2

[0075]

[0076]

[0077] The first lens L1, the second lens L2, the fourth lens L4 and the fifth lens L5 are aspheric lenses, and the parameters of each aspheric mirror surface satisfy Table 2:

[0078] Table 2

[0079] Face number k α 4

[0080] According to the above data, by Figure 7 As shown, the lens satisfies the requirement of clear 2um*2um pixel imaging at the limit resolution of 200lp / mm. Depend on Figure 7 , 8 As shown in and 9, the lens has an MTF defocus of 3 μm under the limit conditions of room temperature 20°C, low temperature -30°C, and high temperature 70°C, which basically has no effect on image quality. It has strong temperature adaptability and can work normally at different temperatures with stable performance. . Depend on Figure 10 , Figure 11 As shown, under the visible light or 850nm near-infrared light environment, the out-of-focus amount is less than 6 μm, and the imaging quality is excellent. The lens can image clearly a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a small-size long-focal-length infrared confocal optical lens, which comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 which are sequentially arranged along a light incidence direction. The first lens L1 is a convex-concave plastic aspheric lens with negative focal power; the second lens L2 is a concave-convex plastic aspheric lens with positive focal power; the third lens L3 is a biconvex glass spherical lens with positive focal power; the fourth lens L4 is a biconvex plastic aspheric lens with positive focal power; and the fifth lens L5 is a biconcave plastic aspheric lens with negative focal power, and the focal length f of the lens is greater than or equal to 5.8 mm and less than or equal to 6.2 mm. The lens can perform clear imaging under visible light and near-infrared light, does not defocus under different temperature changes, facilitates improvement of edge image quality, obtains high resolution and high imaging quality, is small in size and low in cost, and is suitable for complex environments and remote monitoring.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, and in particular relates to a small-volume long-focus infrared confocal optical lens. Background technique [0002] At present, the market competition is becoming increasingly fierce, and the miniaturization, multi-function, and strong environmental adaptability of the lens are the main development trends. Working around the clock in the security field is the basic requirement of the lens. At present, most of the lenses used in security systems have the following defects: 1) short focal length, it is difficult to realize long-distance monitoring; 2) the F number is greater than 2.0, the aperture is small, the resolution is low, and it is greatly affected by temperature, which cannot be applied to complex environments; 3) There are problems such as serious purple fringing, poor imaging at the edge of the field of view, and poor day and night confocal effects. In order to improve performanc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/14G02B13/18
CPCG02B13/0045G02B13/0055G02B13/008G02B13/14G02B13/18
Inventor 郭冲
Owner JIANGXI PHENIX OPTICS TECH CO LTD