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Wide-angle optical system for passive-type infrared sensor

A wide-angle optical system and infrared sensor technology, applied in the field of infrared sensors, can solve the problem of small azimuth angle of the detector, and achieve the effects of easy overall structure, narrow viewing angle and low cost

Pending Publication Date: 2018-02-09
MIKOLTA OPTICAL TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a passive infrared sensor wide-angle optical system to solve the problem of small detector azimuth angle

Method used

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  • Wide-angle optical system for passive-type infrared sensor
  • Wide-angle optical system for passive-type infrared sensor
  • Wide-angle optical system for passive-type infrared sensor

Examples

Experimental program
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Embodiment 1

[0043] The light distribution technology of a passive infrared sensor wide-angle optical system described in the present invention, the structural schematic diagram of its embodiment 1 is as follows Figure 4 As shown, in this embodiment, the lens body is two separate lens bodies.

[0044] 110 among the figure is an infrared sensor module, which is preferably an infrared thermopile sensor module in this embodiment, which includes a sensor chip 111 and an infrared filter 112. 120 is a wide-angle negative lens, which is an aspheric concave lens, and is used to increase The viewing angle of the sensor, which includes a convex surface 122 opposite to the spherical lens array 130, and a concave surface 121 opposite to the infrared filter 112. 130 is a spherical lens array, and its inner surface 131 is divided into a plurality of small grids with the same area, each small The grids are respectively provided with a small converging convex lens, forming a lens array arranged on a sphe...

Embodiment 2

[0053] In this embodiment, the lens body is two separate lens bodies.

[0054] According to the light distribution technology of a passive infrared sensor wide-angle optical system according to the present invention, the wide-angle negative lens used to expand the viewing angle may be a defocused Fresnel wide-angle lens.

[0055] The light distribution technology of a kind of passive infrared sensor wide-angle optical system described in the present invention, the sectional view of its embodiment 2 is as follows Figure 11 As shown, 210 in the figure is an infrared sensor module. In this embodiment, it is preferably an infrared thermopile sensor module, which includes a sensor chip 211 and an infrared filter 212. 220 is a defocused Fresnel wide-angle lens, which is used for To increase the viewing angle of the sensor, it includes a convex surface 222 opposite to the ball lens array 230 and a jagged defocused Fresnel surface 221 opposite to the infrared sensor module. The defo...

Embodiment 3

[0060] In this embodiment, the lens body is two separate lens bodies.

[0061] According to the light distribution technology of a passive infrared sensor wide-angle optical system according to the present invention, the spherical lens array may be a serrated Fresnel condenser lens array.

[0062] The light distribution technology of a kind of passive infrared sensor wide-angle optical system described in the present invention, the sectional view of its embodiment 3 is as follows Figure 13 As shown, 310 in the figure is an infrared sensor module, which is preferably an infrared thermopile sensor module in this embodiment, which includes a sensor chip 311 and an infrared filter 312. 320 is a wide-angle negative lens, which is used to increase the viewing angle of the sensor , which includes a convex surface 322 opposite to the ball lens array 330 and a concave surface 321 opposite to the infrared sensor module 310 . It is consistent with the wide-angle negative lens 320 in Em...

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Abstract

The invention belongs to the technical field of infrared sensors, and discloses a wide-angle optical system for a passive-type infrared sensor. The system comprises an infrared sensor module group anda wide-angle lens group. The wide-angle lens group comprises a focusing lens array which is formed on the lens body and is used for gathering the infrared thermal radiation at each azimuth in a wideangle range; and a wide-angle concave surface or a wide-angle defocusing Fresnel surface which is formed on the lens body. The light gathered by the focusing lens array is refracted by the wide-angleconcave surface or the wide-angle defocusing Fresnel surface, and the view angle is reduced. After the reduction of the view angle, the gathered infrared thermal radiation is received by the infraredsensor module group. Through the setting of the focusing lens array which plays a role in focusing, the system achieves the gathering of the infrared thermal radiation at each azimuth in the wide angle range, and the gathered light is further refracted, and then the view angle is reduced. The light is received by the infrared sensor, thereby enabling the wide-angle detection function of the wholesystem. The overall structure of the system is easy to implement, and the system is small in size and is low in cost.

Description

technical field [0001] The invention belongs to the technical field of infrared sensors and relates to a wide-angle optical system of a passive infrared sensor. Background technique [0002] Passive infrared sensors have the advantages of small size, stable performance and sensitive response, and are widely used in fire prevention, anti-theft, monitoring, non-contact temperature measurement, human detection, infrared radar, artificial intelligence, moving objects, microwave ovens, air conditioners and other fields. Its core components are mainly composed of optical system, infrared thermopile sensor module (or pyroelectric sensor and other infrared sensors), signal processing and control circuit. The sensor itself does not emit any energy but only passively receives and detects infrared thermal radiation from the environment. [0003] The passive infrared sensor detects the change of infrared heat radiation in a certain three-dimensional guard space through the focusing eff...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/06G02B13/14
CPCG02B13/0015G02B13/008G02B13/06G02B13/14
Inventor 郎欢标
Owner MIKOLTA OPTICAL TECH CO
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