Pyroelectric-type IR receiving element and IR sensor using the s

Details Pyroelectric-type IR receiving element and IR sensor using the s Pyroelectric-type IR receiving element and IR sensor using the s

1997-04-14

2000-09-19

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250332, 2503384, 2503381, 2503382, 250349, 313388, 348165, 315359, G01J 502, H01L 3702

Patent

active

061216143

ABSTRACT:
A pyroelectric-type IR receiving element comprises a pyroelectric substrate which is fixed to a supporting body at its support ends and at least one rectangular patch formed in the substrate. The patch is formed on its opposite surfaces with first and second electrodes which are overlapped to each other. The substrate has a U-shaped slit composed of a pair of side slits and a base slit connecting the side slits. The U-shaped slit surrounds continuously three sides of the patch, so that the patch is supported by the substrate in a cantilever fashion at a cantilever end which is opposed to one of the support ends of the substrate. Since a thermal stress applied to the substrate when the substrate is exposed to a temperature change is absorbed by the U-shaped slit, a stress concentration to be considered is not developed in the patch. As a result, it is possible to reduce the occurrence of popcorn noise, while maintaining good IR sensitivity.

REFERENCES:
patent: 4942301 (1990-07-01), Voles
patent: 5270555 (1993-12-01), Ito et al.
patent: 5420420 (1995-05-01), Taylor et al.
patent: 5523564 (1996-06-01), Yamada et al.

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