Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-03-15
1992-11-03
Anderson, Bruce C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250221, G01D 2104, G01D 904
Patent
active
051608375
ABSTRACT:
A light emitter array diagnostic apparatus for diagnosing whether individual light emitter elements in a light emitter array unit normally emit light or not includes a check data generator which supplied check data so as to cause sequential simultaneous emission of light from at least one light emitter element in each of a plurality of groups of the light emitter array unit divided into such groups, until all of the light emitter elements emit light. The light outputs from the individual light emitter elements are received and photoelectrically converted by photo detector units, and a diagnostic unit connected to the photo detector units and including an adder and/or a comparator diagnoses the state of luminescence of the individual light emitter elements.
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Hirane Hideo
Masuda Kazuhito
Tanno Kiyohiko
Anderson Bruce C.
Hitachi , Ltd.
Hitachi Cable Ltd.
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