Coherent light generators – Particular component circuitry – Controlling current or voltage to laser
Reexamination Certificate
2006-10-17
2006-10-17
Rodriguez, Armando (Department: 2828)
Coherent light generators
Particular component circuitry
Controlling current or voltage to laser
C607S089000
Reexamination Certificate
active
07123636
ABSTRACT:
A laser beam irradiation device according to the present invention is so constructed that it may increase or decrease the excitation electric current flowing through its semiconductor laser diode to enable a user to selectively practice both non-thermal and photo-thermal laser treatments.CPU41is responsive to switching-on and -off of an output-power switching unit S2for sending a reference signal to an amplifier472via an I/O port44and a D/A converter471, so that the amplifier472may provide at its output terminals a reference voltage, with respect to which a control reference voltage for a desired laser output can be determined.Semiconductor laser diode35radiates the laser beam from its opposite sides, and a photo-diode473receives one of the opposite laser beams to provide a light-accepting voltage at its output terminals. The so acquired light-accepting voltage is directed to an amplifier474for amplification, thereby obtaining the monitor voltage.The reference voltage and the monitor voltage are applied to a differential amplifier475, and a differential voltage is amplified by an amplifier476. Thus a controlled working electric current is made to flow in semiconductor laser diode35so that it may be energized and oscillated at the set output level.
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patent: 5272716 (1993-12-01), Soltz et al.
patent: 6168589 (2001-01-01), Tobinick
patent: 6558653 (2003-05-01), Andersen et al.
Yamazaki Iwao
Yamazaki Kimiyo
Bacon & Thomas
Rodriguez Armando
Ya-Man Ltd.
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