Title:
LASER DIODE DRIVING CIRCUIT, ELECTRONIC CIRCUIT, METHOD FOR CONTROLLING LASER DIODE DRIVING CIRCUIT, AND DUTY CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2007/114119
Kind Code:
A1
Abstract:
A laser diode driving circuit comprises a duty control amplifier (23) that controls, in
accordance with a duty control signal, the duty ratio of a main signal to be used for
a laser control; and an AND gate (22) that outputs a duty control signal to the duty
control amplifier (23) and also outputs a duty control signal for controlling, in
accordance with a shutdown signal of the laser diode, the duty ratio of the main signal
in the duty control amplifier (23) such that it is equal to zero percent. This
eliminates a necessity of inputting the main signal, the duty ratio of which has
been controlled, to the logic circuit that would operate unstably. Thus, both
the output shutdown of the semiconductor laser and the control of the output duty
can be stably achieved.
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Inventors:
NAITO HIDETOSHI (JP)
Application Number:
PCT/JP2007/056427
Publication Date:
October 11, 2007
Filing Date:
March 27, 2007
Export Citation:
Assignee:
EUDYNA DEVICES INC (JP)
NAITO HIDETOSHI (JP)
NAITO HIDETOSHI (JP)
International Classes:
H01S5/042
Domestic Patent References:
| WO1998056089A1 | 1998-12-10 |
Foreign References:
| JPH05129689A | 1993-05-25 | |||
| JPH04155981A | 1992-05-28 | |||
| JPH07240557A | 1995-09-12 | |||
| JPH08279788A | 1996-10-22 | |||
| JPH09200153A | 1997-07-31 | |||
| JPH11121844A | 1999-04-30 | |||
| JP2003298524A | 2003-10-17 | |||
| JP2001244556A | 2001-09-07 | |||
| JP2001320122A | 2001-11-16 |
Attorney, Agent or Firm:
KATAYAMA, Shuhei (6-1 Kyobashi 1-chome, Chuo-ku, Tokyo 31, JP)
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