Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-06-07
1998-05-12
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214RC, H01J 4014
Patent
active
057509808
ABSTRACT:
A high-speed, high-resolution optical scanner system includes a flying spot scanner for scanning a beam across an object bearing information to be read and a high-bandwidth, high-sensitivity optical receiver including an avalanche photodiode for sensing the variation in light intensity of the beam reflected from the object being scanned; a power source for biasing the avalanche diode proximate its reverse breakdown voltage to produce high current gain in response to incident light; and a charge collector circuit responsive to the avalanche photodiode for producing a voltage proportional to the light incident on the avalanche photodiode.
REFERENCES:
patent: 4019048 (1977-04-01), Maione et al.
patent: 4626676 (1986-12-01), Gerardin
Rysin Alex A.
Swithers David Jonathan
Computer Identics, Inc.
Pyo Kevin
Westin Edward P.
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