JPS56144590A - Driving device for semiconductor laser - Google Patents

Driving device for semiconductor laser

Info

Publication number
JPS56144590A
JPS56144590A JP4841680A JP4841680A JPS56144590A JP S56144590 A JPS56144590 A JP S56144590A JP 4841680 A JP4841680 A JP 4841680A JP 4841680 A JP4841680 A JP 4841680A JP S56144590 A JPS56144590 A JP S56144590A
Authority
JP
Japan
Prior art keywords
laser
power source
driving
constant current
delayed
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.)
Granted
Application number
JP4841680A
Other languages
Japanese (ja)
Other versions
JPS6243351B2 (en
Inventor
Keiichiro Horai
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4841680A priority Critical patent/JPS56144590A/en
Publication of JPS56144590A publication Critical patent/JPS56144590A/en
Publication of JPS6243351B2 publication Critical patent/JPS6243351B2/ja
Granted 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 damage to and deterioration in a recording and reproducing laser of optical information by a method wherein a constant current circuit in driving is delayed so as to start operation after the power source voltage is stabilized when the power is ON, while the driving thereof is halted simultaneously with the OFF of the power source. CONSTITUTION:This device supplies an output V1 from a constant voltage supply circuit 5 to drive a laser 4 with a constant current I3. When a switch 2 is ON, R2.C4>>R1.C1 is established. The rising of V2 and V3 is delayed from V1 and transistor (TR)Q4 is turned ON from off while a transistor Q9 is turned off from on so that a constant current starts flowing after V1 is stabilized sufficiently. On the other hand, when the switch turns OFF, the voltage of C4 switches ON the TRQ2, OFF the TRQ4 and ON the TRQ9 whereby the driving current is stopped before V1 is changed. This can prevents the generation of a spike current due to the transient characteristics of the power source making it easy to handle as a device for recording and reproducing optical information. Thus, damage to and deterioration in the laser are eliminated.
JP4841680A 1980-04-13 1980-04-13 Driving device for semiconductor laser Granted JPS56144590A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4841680A JPS56144590A (en) 1980-04-13 1980-04-13 Driving device for semiconductor laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4841680A JPS56144590A (en) 1980-04-13 1980-04-13 Driving device for semiconductor laser

Publications (2)

Publication Number Publication Date
JPS56144590A true JPS56144590A (en) 1981-11-10
JPS6243351B2 JPS6243351B2 (en) 1987-09-12

Family

ID=12802697

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4841680A Granted JPS56144590A (en) 1980-04-13 1980-04-13 Driving device for semiconductor laser

Country Status (1)

Country Link
JP (1) JPS56144590A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6242585A (en) * 1985-08-20 1987-02-24 Matsushita Electric Ind Co Ltd Semiconductor laser protecting circuit
US4745610A (en) * 1985-05-20 1988-05-17 Olympus Optical Co., Ltd. Semiconductor laser drive device with an abnormal voltage protection circuit
JPH0330130A (en) * 1989-06-28 1991-02-08 Sharp Corp Semiconductor laser drive circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745610A (en) * 1985-05-20 1988-05-17 Olympus Optical Co., Ltd. Semiconductor laser drive device with an abnormal voltage protection circuit
JPS6242585A (en) * 1985-08-20 1987-02-24 Matsushita Electric Ind Co Ltd Semiconductor laser protecting circuit
JPH0330130A (en) * 1989-06-28 1991-02-08 Sharp Corp Semiconductor laser drive circuit

Also Published As

Publication number Publication date
JPS6243351B2 (en) 1987-09-12

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