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Structure for masks

A light shield and through-hole technology, applied in the field of light shield structure, can solve the problem of high output voltage of sensor circuit

Active Publication Date: 2015-04-08
EIZO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the output voltage of the sensor circuit is larger

Method used

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  • Structure for masks
  • Structure for masks
  • Structure for masks

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Experimental program
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no. 1 approach

[0043] The pyroelectric sensor having the structure including the light shield 110 according to the first embodiment will be described.

[0044] Figure 8 A shows the external view of the hood 110, Figure 8 B shows an example of the dimensions of the opening pattern 112 of the shade 110 .

[0045] The shade 110 includes: a sheet portion 111 for blocking infrared rays; an opening pattern 112 formed of a plurality of through holes formed in the sheet portion 111 ; and a mounting portion 113 . The light shield structure includes a sheet portion 111 and an opening pattern 112 .

[0046] For example, the shade 110 (perforated metal plate) is molded by pressing a metal plate.

[0047] On the detection surface of the pyroelectric sensor, the arrangement direction of the two pyroelectric elements of the pyroelectric sensor is defined as the x direction, and the direction perpendicular to the x direction on the detection surface is defined as the y direction. The opening pattern 1...

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Abstract

[Problem] To provide a structure for a mask for dual-type pyroelectric sensors capable of accurately detecting movement of a moving body in the direction of the array of two pyroelectric elements and in a direction perpendicular to the direction of the array. [Solution] The structure for a mask applied to a detection face of a dual-type pyroelectric sensor for improving detection sensitivity of moving bodies comprises a sheet portion obstructing infrared light and an aperture pattern made from through-holes formed in the sheet portion. Using the direction of disposition of the two pyroelectric elements of the pyroelectric sensor on the detection face as the x-direction and the direction perpendicular to the x-direction on the detection face as the y-direction, the aperture pattern is formed so that ratio of the infrared light irradiation range with respect to the two pyroelectric elements changes in accordance with movement of a moving body in the x-direction and y-direction respectively.

Description

technical field [0001] The present invention relates to a light shield structure covering a pyroelectric sensor. In particular, it relates to a structure of a light shield fitted on the detection surface of a dual type pyroelectric sensor in order to improve the detection sensitivity of a moving object. Background technique [0002] Patent Document 1 is known as a prior art for putting a light shield on a pyroelectric sensor. In Patent Document 1, the adjustment detection area is set by putting a hood on the lens of the pyroelectric sensor. [0003] The pyroelectric sensor utilizes the pyroelectric effect of an element called a pyroelectric body (hereinafter referred to as a "pyroelectric element") such as a ferroelectric ceramic. The pyroelectric effect refers to a phenomenon in which electric charges are induced on the surface of a pyroelectric body by a change in weak thermal energy such as infrared rays emitted by motion or the human body (hereinafter simply referred t...

Claims

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Application Information

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IPC IPC(8): G01J1/02G01J1/06G01V8/12G01V8/20
CPCG01J5/0831G01J5/34G01J1/0437G02B5/208G01J5/0025
Inventor 南沙知宫永修平村田敬宫泽势至
Owner EIZO
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