Radiant energy – Photocells; circuits and apparatus – Signal isolator
Patent
1979-09-12
1981-12-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Signal isolator
357 19, G02B 2700
Patent
active
043072976
ABSTRACT:
A photocoupler is disclosed comprising a pair of coplanar elements spaced from each other so as to define an opening therebetween, a light emitter secured to one of the elements and a light receiver disposed opposite the light emitter and secured to the other element. The light from the light emitter is transmitted to the receiver by an optical element, such as a lens, having a central projection which extends into the opening between the two elements and accurately positions the optical element with respect to the light emitter and receiver for optimum light transmission therebetween.
REFERENCES:
patent: 3628039 (1971-12-01), Ochs et al.
patent: 3845318 (1974-10-01), Thillays
patent: 4114177 (1978-09-01), King
patent: 4124860 (1978-11-01), Johnson
Groff Alain
Talpied Andre
Briody Thomas A.
Nelms David C.
Streeter William J.
Tamoshunas Algy
U.S. Philips Corporation
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