Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2006-01-24
2006-01-24
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C347S246000, C372S029014
Reexamination Certificate
active
06989520
ABSTRACT:
There is provided an emission control apparatus with which it is capable of variably controlling the intensity of a light beam to be set, in a stable manner and at a low cost without increasing the circuit size. A semiconductor laser diode LD emits a light beam. A photo diode PD detects the intensity of the light beam emitted from the semiconductor laser diode LD. A driving circuit supplies driving current to the semiconductor laser diode LD. A switching section switches the driving current according to a video signal. An input terminal receives a pulse width modulation signal. A smoothing circuit smoothes the received pulse width modulation signal. A laser driver controls a value of the driving current according to smoothed voltage obtained by the smoothing circuit such that the detected intensity of the light beam is equal to a target intensity.
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Mochiduki Masataka
Tomioka Yasuhiro
Allen Stephone B.
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
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