Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2005-02-15
2005-02-15
Pyo, Kevin (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C250S2140RC, C372S038020, C369S116000
Reexamination Certificate
active
06855919
ABSTRACT:
In a laser-driving device including a high-frequency current generating circuit generating a high-frequency current superimposed on a control current output from a light intensity control circuit for light intensity control, and supplied to a laser diode as a drive current, the high-frequency current generating circuit has a sourcing current source, a sinking current source, current switches connected between the current sources and a drive output terminal respectively, a gated oscillation circuit oscillating with a desired frequency, and switch drive circuits complementarily on/off controlling the current switches by using a drive switching signal obtained by removing a high-frequency component from an output signal of the oscillation circuit. The present invention, therefore, provides a high-frequency current generating circuit which can increase the amplitude of the high-frequency current superimposed on the control current of the laser diode and which generates less heat while suppressing power consumption.
REFERENCES:
patent: 4819242 (1989-04-01), Kaku et al.
patent: 5127015 (1992-06-01), Chikugawa et al.
patent: 5848044 (1998-12-01), Taguchi et al.
patent: 6011768 (2000-01-01), Taguchi
patent: 6111901 (2000-08-01), Taguchi et al.
patent: 58-7941 (1983-01-01), None
patent: 62-86882 (1987-04-01), None
patent: 62-236150 (1987-10-01), None
patent: 4-260382 (1992-09-01), None
patent: 6-84198 (1994-03-01), None
patent: 6-132591 (1994-05-01), None
patent: 6-274918 (1994-09-01), None
patent: 7-106673 (1995-04-01), None
patent: 7-327054 (1995-12-01), None
patent: 10-247329 (1998-09-01), None
Elantec High Performance Analog Integrated Circuits, pp. 1 to 9, “EL6200C Preliminary 450 MHZ HFM Oscillator”, Mar. 19, 1999.
Kabushiki Kaisha Toshiba
Pyo Kevin
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