JPS6476545A - Laser power control device - Google Patents

Laser power control device

Info

Publication number
JPS6476545A
JPS6476545A JP62235260A JP23526087A JPS6476545A JP S6476545 A JPS6476545 A JP S6476545A JP 62235260 A JP62235260 A JP 62235260A JP 23526087 A JP23526087 A JP 23526087A JP S6476545 A JPS6476545 A JP S6476545A
Authority
JP
Japan
Prior art keywords
recording
time
power control
semiconductor laser
holding circuit
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
JP62235260A
Other languages
Japanese (ja)
Inventor
Yoshihiko Honshiyouya
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 Mobile Communications Co Ltd
Original Assignee
Matsushita Communication 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 Communication Industrial Co Ltd filed Critical Matsushita Communication Industrial Co Ltd
Priority to JP62235260A priority Critical patent/JPS6476545A/en
Publication of JPS6476545A publication Critical patent/JPS6476545A/en
Pending legal-status Critical Current

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  • Optical Head (AREA)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To always obtain prescribed recording output even when the characteristic of a semiconductor laser changes by providing a level holding circuit, performing feedback control even at the time of recording, and holding recording current just before by the level holding circuit provided newly at the time of reproduction. CONSTITUTION:At the time of switching a mode from a recording state to a reproducing state, a recording current value just before is held by the level holding circuit 8. Next, when the mode is switched from the reproducing state to the recording state, a few quantity of change is generated in the semiconductor laser 13 during that time, and almost prescribed recording output can be obtained immediately after the switching. Thereby, it is possible to apply power control by the feedback control even in recording in a power control device with slow response. In such a way, it is possible to always obtain the prescribed recording output even when the characteristic of the semiconductor laser 13 changes due to the influence of return light from a medium, temperature change, or deterioration in the lapse of time, etc.
JP62235260A 1987-09-18 1987-09-18 Laser power control device Pending JPS6476545A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62235260A JPS6476545A (en) 1987-09-18 1987-09-18 Laser power control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62235260A JPS6476545A (en) 1987-09-18 1987-09-18 Laser power control device

Publications (1)

Publication Number Publication Date
JPS6476545A true JPS6476545A (en) 1989-03-22

Family

ID=16983449

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62235260A Pending JPS6476545A (en) 1987-09-18 1987-09-18 Laser power control device

Country Status (1)

Country Link
JP (1) JPS6476545A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02270143A (en) * 1989-04-12 1990-11-05 Hitachi Maxell Ltd Semiconductor laser oscillator driving device
JPH0513848A (en) * 1991-07-04 1993-01-22 Mitsubishi Electric Corp Light intensity control circuit of semiconductor light emitting element
US5567768A (en) * 1992-04-23 1996-10-22 Rohm And Haas Company Poly(vinyl alcohol) blends
US6369917B1 (en) * 1997-06-06 2002-04-09 Canon Kabushiki Kaisha Image forming apparatus with temperature control activated by mode switching
US6714503B1 (en) 1998-04-03 2004-03-30 Samsung Electronics Co., Ltd. Adaptive recording method and apparatus for high-density optical recording apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02270143A (en) * 1989-04-12 1990-11-05 Hitachi Maxell Ltd Semiconductor laser oscillator driving device
JPH0513848A (en) * 1991-07-04 1993-01-22 Mitsubishi Electric Corp Light intensity control circuit of semiconductor light emitting element
US5567768A (en) * 1992-04-23 1996-10-22 Rohm And Haas Company Poly(vinyl alcohol) blends
US5652305A (en) * 1992-04-23 1997-07-29 Rohm And Haas Company Polymer blends
US6369917B1 (en) * 1997-06-06 2002-04-09 Canon Kabushiki Kaisha Image forming apparatus with temperature control activated by mode switching
US6714503B1 (en) 1998-04-03 2004-03-30 Samsung Electronics Co., Ltd. Adaptive recording method and apparatus for high-density optical recording apparatus
US7212310B2 (en) 1998-04-03 2007-05-01 Samsung Electronics Co., Ltd. Adaptive recording method and apparatus for high-density optical recording apparatus

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