JPS6457771A - Semiconductor laser device - Google Patents

Semiconductor laser device

Info

Publication number
JPS6457771A
JPS6457771A JP21471087A JP21471087A JPS6457771A JP S6457771 A JPS6457771 A JP S6457771A JP 21471087 A JP21471087 A JP 21471087A JP 21471087 A JP21471087 A JP 21471087A JP S6457771 A JPS6457771 A JP S6457771A
Authority
JP
Japan
Prior art keywords
deterioration
voltage
abnormality
comparison reference
output
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
JP21471087A
Other languages
Japanese (ja)
Inventor
Yasuhiro Sakamoto
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP21471087A priority Critical patent/JPS6457771A/en
Publication of JPS6457771A publication Critical patent/JPS6457771A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To always grasp an operating state and to obtain information of maintenance whether it is normal deterioration or abnormality by comparing a monitoring output with one of a plurality of comparison reference values, and sequentially comparing it with other comparison reference value to detect the operating state. CONSTITUTION:It is applied to a semiconductor laser device having an APC circuit including a current limiter to detect a deterioration or an abnormality, for example, in two stages. A first comparison reference voltage V2 is set to a value lower than a monitoring voltage at normal time. When a laser diode 1 is deteriorated to reduce a monitoring voltage V0, the output of a comparator 24 is inverted. The deterioration or abnormality of first stage of the diode 1 is notified to an exterior. A second comparison reference voltage V3 is set to a value lower than the first voltage. When the deterioration of the diode 1 is advanced so that the voltage V0 is further reduced, the output of the comparator 30 is inverted. The deterioration or abnormality of second stage is notified.
JP21471087A 1987-08-28 1987-08-28 Semiconductor laser device Pending JPS6457771A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21471087A JPS6457771A (en) 1987-08-28 1987-08-28 Semiconductor laser device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21471087A JPS6457771A (en) 1987-08-28 1987-08-28 Semiconductor laser device

Publications (1)

Publication Number Publication Date
JPS6457771A true JPS6457771A (en) 1989-03-06

Family

ID=16660331

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21471087A Pending JPS6457771A (en) 1987-08-28 1987-08-28 Semiconductor laser device

Country Status (1)

Country Link
JP (1) JPS6457771A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0369029A (en) * 1989-08-09 1991-03-25 Hitachi Ltd Dust removing system for optical disk device
JPH03132931A (en) * 1989-10-18 1991-06-06 Hitachi Ltd Optical disk device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0369029A (en) * 1989-08-09 1991-03-25 Hitachi Ltd Dust removing system for optical disk device
JPH03132931A (en) * 1989-10-18 1991-06-06 Hitachi Ltd Optical disk device

Similar Documents

Publication Publication Date Title
JPS6459878A (en) Semiconductor laser protective circuit
KR100393121B1 (en) Discharge lamp operating device
US3890559A (en) Circuit for monitoring and controlling multiple power supplies
US6205039B1 (en) Device for supervising a high voltage converter station
DE68924322D1 (en) Circuit for electromagnetic rotation sensor.
JPS6457771A (en) Semiconductor laser device
JPS64817A (en) Logic circuit
JPS6414982A (en) Semiconductor laser device
JPS5537640A (en) Overvoltage preventive circuit of multi-power supply
JPS6459515A (en) Power failure sequence control circuit
SU1108418A2 (en) Device for protecting voltage stabilizer
SU1267388A2 (en) Bipolar stabilized power source
JPS6430430A (en) Power source circuit
SU1229916A1 (en) Stabilized power source
SU1614014A2 (en) Pulsed voltage stabilizer
SU477360A1 (en) Device to control the output voltage of power sources
SU1723566A1 (en) Supply source
SU1665475A1 (en) D c/d c voltage converter
SU1003346A1 (en) Electronic switch
SU1267529A1 (en) Device for overload protection of electric equipment
SU1184044A1 (en) Device for high-speed protection of load
SU1448221A1 (en) Device for measuring extreme temperatures
SU1471263A1 (en) Stabilized power supply of controlled electrode of gas-discharge device with protection
JPS6485576A (en) Power converting device
SU1557554A1 (en) Stabilized power supply source