Coherent light generators – Particular component circuitry – For driving or controlling laser
Reexamination Certificate
2008-05-06
2008-05-06
Harvey, Minsun Oh (Department: 2828)
Coherent light generators
Particular component circuitry
For driving or controlling laser
C327S514000
Reexamination Certificate
active
07369590
ABSTRACT:
A disclosed laser diode driving circuit causes a laser diode to emit light by varying a current value of a current source in accordance with a control signal input externally and supplying a current that is the same as or proportional to the current value to the laser diode. The driving circuit includes correction circuitry for generating a reference forward voltage as a reference for the laser diode in accordance with a predetermined driving current for driving the laser diode, generating a forward voltage for the laser diode in accordance with the predetermined driving current, and correcting a current supplied to the laser diode so that the forward voltage becomes the same as the reference forward voltage.
REFERENCES:
patent: 4813046 (1989-03-01), Shimada
patent: 5317578 (1994-05-01), Ogou
patent: 5517151 (1996-05-01), Kubota
patent: 5815025 (1998-09-01), Kubota
patent: 10-270784 (1998-10-01), None
Dickstein & Shapiro LLP
Harvey Minsun Oh
Nguyen Tuan N.
Ricoh & Company, Ltd.
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