Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1981-04-15
1984-03-13
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250342, G01J 142
Patent
active
044370024
ABSTRACT:
A pyroelectric infrared sensor for use in intrusion alarm systems, including a pyroelectric ceramic element provided with two pairs of electrodes, of which the front electrodes are so configured as to permit a simplified printing process for higher productivity and lower production costs. The front electrodes each have a first region overlapping with a part of one of the back electrodes and a second region overlapping with a part of the other of the back electrodes, and are arranged adjacent to each other and are electrically insulated from each other. The first regions and the second regions of the front electrodes have a ratio of areas of approximately 1:1. The pyroelectric element is attached to a holding member which is so designed that the back electrode areas of the element are free from physical contact with any thermally conductive solid material that may detract from the thermal responsiveness of the element. The element is accommodated in a protective can, wherein the distance between the element and the back surface of a supporting stem is maximized so as to minimize the thermally hazardous contamination via the back surface of the stem facing a thermal body and thus to stabilize the characteristic of the sensor.
REFERENCES:
patent: 3480777 (1969-11-01), Astheimer
patent: 3539803 (1970-11-01), Beerman
patent: 4214165 (1980-07-01), Asawa
patent: 4218620 (1980-08-01), Oettel
patent: 4284888 (1981-08-01), Appleby
patent: 4302674 (1981-11-01), Adachi et al.
patent: 4322124 (1982-03-01), Padgitt et al.
Akiyama Masanori
Edano Shigeki
Taniguchi Yoshiharu
Burt Pamela S.
Fields Carolyn E.
Nihon Ceramic Co., Ltd.
Shortley John L.
Smith Alfred E.
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