Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1984-11-02
1986-12-23
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250351, G01J 100
Patent
active
046314067
ABSTRACT:
An infrared ray detector comprises an infrared ray detecting member (25), a pair of opposing members (32, 33) each having a plurality of infrared ray transmitting portions (34, 35) and infrared ray non-transmitting portions (36, 37), a pair of vibrators (38, 39) and a driving signal supplying circuit (59, 60). The pair of opposing members (32, 33) are disposed in the area of incidence of infrared rays to the infrared ray detecting member (25), and are displaced periodically by the pair of vibrators (38, 39). The pair of vibrators (38, 39) are driven by a driving signal from the driving signal supplying circuit (59, 60), the amplitude of the driving signal being selected to be smaller than that of a driving signal used in a case where there are periodically repeated a state in which both of the infrared ray transmitting portions (34, 35) of the pair of opposing members (32, 33) are completely opened and a state in which those are completely blocked, subject to no change in an ambient temperature.
REFERENCES:
patent: 3925668 (1975-12-01), Anderson et al.
patent: 4233512 (1980-11-01), Rupert
patent: 4485305 (1984-11-01), Kuwano et al.
Howell Janice A.
Sanyo Electric Co,. Ltd.
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