Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1997-10-29
2000-04-11
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
G01J 502
Patent
active
060490802
ABSTRACT:
A pyroelectric infrared sensor device with improved sensitivity and relative detection rate and reduced manufacturing cost. The infrared sensor device includes a substrate of rectangular shape. The substrate is made of a pyroelectric material, such as tetragonal-system lead titanate pyroelectric ceramics. A pair of comb-shaped electrode patterns each having a set of parallel conductive open-ended fingers are disposed on the top surface of the substrate such that the open-ended fingers of one electrode pattern are spatially interdigitated in relation to those of the other. The paired comb-shaped electrodes have at least three finger pairs whereas the interelectrode distance corresponding to the gap between neighboring fingers is greater than 100 micrometers. These comb-shaped electrodes satisfying the criteria render the pyroelectric material, upon application of a DC voltage between them, substantially horizontally polarizable at or near the top substrate surface which acts as the infrared light receiving plane. An opposite electrode is on the entire bottom surface of the substrate. This electrode has portions insulatively overlapping the comb-shaped electrodes with the pyroelectric material being sandwiched therebetween.
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German Office Action dated Dec. 21, 1998 and English-language translation.
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Patent Abstracts of Japan, vol. 18, No. 519 (P-1807), Sep. 29, 1994, JP 6-180252 A (Murata) Jun. 28, 1994.
Austrian Search Report dated Apr. 30, 1998.
Hannaher Constantine
Murata Manufacturing Co. Ltd.
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