Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2008-09-05
2011-10-11
LeGasse, Jr., Francis M (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S214100, C330S308000
Reexamination Certificate
active
08035072
ABSTRACT:
An optical semiconductor device and an infrared data communication apparatus eliminating a direct current component and a low frequency component included in a light signal. The optical semiconductor device converts a light signal into an electric signal and amplifies the converted electric signal. The optical semiconductor device includes: a photodiode which converts a light signal into a current signal; another photodiode which converts a light signal into a current signal; a current amplifying circuit which includes an operational amplifier which amplifies an output current from the photodiode; and a current-voltage conversion circuit which converts an output current from the other photodiode into a voltage. An output terminal of the current amplifying circuit is connected to an input terminal of the current-voltage conversion circuit.
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English language Abstract JP 4-032307 A.
Japanese Office Action for the corresponding Japanese Patent Application No. 2007-263580, mailed May 24, 2011.
Fukuda Hideo
Yamaguchi Hiroshi
Greenblum & Bernstein P.L.C.
LeGasse, Jr. Francis M
Panasonic Corporation
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