JPS54144892A - Drive circuit for light emitting semiconductor element - Google Patents

Drive circuit for light emitting semiconductor element

Info

Publication number
JPS54144892A
JPS54144892A JP5353978A JP5353978A JPS54144892A JP S54144892 A JPS54144892 A JP S54144892A JP 5353978 A JP5353978 A JP 5353978A JP 5353978 A JP5353978 A JP 5353978A JP S54144892 A JPS54144892 A JP S54144892A
Authority
JP
Japan
Prior art keywords
semiconductor element
light emitting
ambient temperature
emitting semiconductor
current
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
JP5353978A
Other languages
Japanese (ja)
Inventor
Kazuo Hisama
Masahiko Hirano
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP5353978A priority Critical patent/JPS54144892A/en
Publication of JPS54144892A publication Critical patent/JPS54144892A/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
    • H01S5/06804—Stabilisation of laser output parameters by monitoring an external parameter, e.g. temperature

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)
  • Led Devices (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To supply sufficient current to the light emitting semiconductor element at any ambient temperature and to drive the light emitting semiconductor element efficiently, by adding the control circuit of the current of the light emitting semiconductor element and the temperature detection circuit. CONSTITUTION:The ambient temperature is detected at the temperature detection circuit in which the thermister 11 and the resistor 12 are connected in series with the power supply terminal 10 and ground terminal. According to the detection output, a given current flows to the light emitting semiconductor element 1 when the ambient temperature is less than a given value, and when it is more than a given value, the current in the semiconductor element 1 is controlled with the control circuit 2 reducing the current of the semiconductor element with the increase in the ambient temperature. Thus, in any ambient temperature, efficient light emission can be made by flowing sufficient current to the semiconductor element 1 even any ambient temperature.
JP5353978A 1978-05-04 1978-05-04 Drive circuit for light emitting semiconductor element Pending JPS54144892A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5353978A JPS54144892A (en) 1978-05-04 1978-05-04 Drive circuit for light emitting semiconductor element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5353978A JPS54144892A (en) 1978-05-04 1978-05-04 Drive circuit for light emitting semiconductor element

Publications (1)

Publication Number Publication Date
JPS54144892A true JPS54144892A (en) 1979-11-12

Family

ID=12945602

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5353978A Pending JPS54144892A (en) 1978-05-04 1978-05-04 Drive circuit for light emitting semiconductor element

Country Status (1)

Country Link
JP (1) JPS54144892A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6185176U (en) * 1984-11-07 1986-06-04
JPH02212168A (en) * 1989-02-13 1990-08-23 Hitachi Ltd Optical recording head

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6185176U (en) * 1984-11-07 1986-06-04
JPH02212168A (en) * 1989-02-13 1990-08-23 Hitachi Ltd Optical recording head

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