Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2006-08-10
2008-10-28
Lee, John R (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C330S252000, C369S047250, C369S134000
Reexamination Certificate
active
07442913
ABSTRACT:
A photocurrent amplifier circuit is capable of selectively amplifying one or more of photocurrents which are respectively obtainable from plural receiving devices, and can be realized to have a small size. The photocurrent amplifier circuit includes: light receiving devices; amplifier devices associated with the light receiving devices; device selector switches which apply input voltages, which inactivate the amplifier devices, to the associated amplifier devices; and a differential amplifier circuit having an inverting input unit configured by the amplifier devices which are connected in parallel. The inputs of the amplifier devices and the output of the differential amplifier circuit are connected by gain resistances. The differential amplifier circuit amplifies, into voltage signals, photocurrents flowing from the light receiving devices which respectively associated with the gain resistances.
REFERENCES:
patent: 6480042 (2002-11-01), Kadowaki
patent: 7002881 (2006-02-01), Okuda et al.
patent: 2003/0231574 (2003-12-01), Okuda et al.
patent: 2004-22051 (2004-01-01), None
Fukuda Hideo
Miyamoto Shinichi
Lee John R
Matsushita Electric - Industrial Co., Ltd.
Wenderoth , Lind & Ponack, L.L.P.
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