JPS6247181A - Semiconductor laser driving circuit - Google Patents

Semiconductor laser driving circuit

Info

Publication number
JPS6247181A
JPS6247181A JP18665485A JP18665485A JPS6247181A JP S6247181 A JPS6247181 A JP S6247181A JP 18665485 A JP18665485 A JP 18665485A JP 18665485 A JP18665485 A JP 18665485A JP S6247181 A JPS6247181 A JP S6247181A
Authority
JP
Japan
Prior art keywords
laser
power source
semiconductor laser
voltage
unstable operation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP18665485A
Other languages
Japanese (ja)
Inventor
Toshihiro Takesue
Takashi Murahashi
Yoshiyuki Ichihara
Toshihiko Nakazawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP18665485A priority Critical patent/JPS6247181A/en
Publication of JPS6247181A publication Critical patent/JPS6247181A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation

Abstract

PURPOSE:To prevent a laser from damaging by slowly starting a current of a transistor circuit for driving a semiconductor laser or switch means for turning ON and OFF an FET circuit and the laser after turning ON a power source to gradually increase the power source voltage, thereby eliminating the unstable operation of the laser. CONSTITUTION:When a power source is connected with an IN terminal, a voltage output to an OUT terminal through a resistor R connected between the base and the collector of Tr and a capacitor C between the base and the ground of a slow starter 11 gradually increases to eventually become constant. Since this voltage is supplied to a semiconductor laser 1, a surge current does not flow. A switch 10 is turned ON and OFF by the output of an image information source 9. Since the power source voltage is directly supplied to other circuit components, an unstable operation period is extremely short. Accordingly, the unstable operation of the laser 1 is eliminated to prevent the laser 1 from damaging.
JP18665485A 1985-08-27 1985-08-27 Semiconductor laser driving circuit Pending JPS6247181A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18665485A JPS6247181A (en) 1985-08-27 1985-08-27 Semiconductor laser driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18665485A JPS6247181A (en) 1985-08-27 1985-08-27 Semiconductor laser driving circuit

Publications (1)

Publication Number Publication Date
JPS6247181A true JPS6247181A (en) 1987-02-28

Family

ID=16192351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18665485A Pending JPS6247181A (en) 1985-08-27 1985-08-27 Semiconductor laser driving circuit

Country Status (1)

Country Link
JP (1) JPS6247181A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0270470U (en) * 1988-11-15 1990-05-29
JPH06310792A (en) * 1993-04-22 1994-11-04 Nec Corp Optical amplifier
JP2009231398A (en) * 2008-03-20 2009-10-08 Brother Ind Ltd Light output device and image forming device equipped with the same
JP2010197841A (en) * 2009-02-26 2010-09-09 Brother Ind Ltd Image forming device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57202792A (en) * 1981-06-05 1982-12-11 Matsushita Electric Ind Co Ltd Laser power source

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57202792A (en) * 1981-06-05 1982-12-11 Matsushita Electric Ind Co Ltd Laser power source

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0270470U (en) * 1988-11-15 1990-05-29
JPH06310792A (en) * 1993-04-22 1994-11-04 Nec Corp Optical amplifier
JP2009231398A (en) * 2008-03-20 2009-10-08 Brother Ind Ltd Light output device and image forming device equipped with the same
US8063584B2 (en) 2008-03-20 2011-11-22 Brother Kogyo Kabushiki Kaisha Light output device and image forming apparatus including the same
JP2010197841A (en) * 2009-02-26 2010-09-09 Brother Ind Ltd Image forming device

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