JPS57200953A - Optical record carrier reader - Google Patents

Optical record carrier reader

Info

Publication number
JPS57200953A
JPS57200953A JP56083874A JP8387481A JPS57200953A JP S57200953 A JPS57200953 A JP S57200953A JP 56083874 A JP56083874 A JP 56083874A JP 8387481 A JP8387481 A JP 8387481A JP S57200953 A JPS57200953 A JP S57200953A
Authority
JP
Japan
Prior art keywords
light
photodetector
polarization direction
feedback
signal
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
JP56083874A
Other languages
Japanese (ja)
Other versions
JPS6226098B2 (en
Inventor
Yoshinori Higuchi
Ei Yamada
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56083874A priority Critical patent/JPS57200953A/en
Publication of JPS57200953A publication Critical patent/JPS57200953A/en
Publication of JPS6226098B2 publication Critical patent/JPS6226098B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • 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
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters

Landscapes

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

Abstract

PURPOSE:To obtain a stable semiconductor laser output by shifting the polarization direction of a beam of light from a light source from a polarization direction determined by a polarizing beam splitter, and then using light split by the beam splitter for feedback. CONSTITUTION:The polarization direction of a beam of light from a laser diode 11 is shifted slightly from a polarization direction determined by a polarizing beam splitter 12, and consequently the beam from the light source is split into a beam from a record carrier to a signal photodetector 15 and a beam to a feedback photodetector 13. The feedback photodetector 13 transduces the beam into an electric signal, which is amplified by an amplifier 17 and then compared with a reference signal 14; and an amplifier 18 amplifies the difference signal, thus forming a loop for making the quantity of output light of the laser diode 11 constant. Therefore, the beam emitted from the light source 11 is split into the beam to the feedback photodetector 13 and a beam to the signal photodetector 15 by only one polarizing beam splitter 12.
JP56083874A 1981-06-02 1981-06-02 Optical record carrier reader Granted JPS57200953A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56083874A JPS57200953A (en) 1981-06-02 1981-06-02 Optical record carrier reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56083874A JPS57200953A (en) 1981-06-02 1981-06-02 Optical record carrier reader

Publications (2)

Publication Number Publication Date
JPS57200953A true JPS57200953A (en) 1982-12-09
JPS6226098B2 JPS6226098B2 (en) 1987-06-06

Family

ID=13814797

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56083874A Granted JPS57200953A (en) 1981-06-02 1981-06-02 Optical record carrier reader

Country Status (1)

Country Link
JP (1) JPS57200953A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61187135A (en) * 1985-02-15 1986-08-20 Mitsubishi Electric Corp Optical device
JPS62140253A (en) * 1985-12-13 1987-06-23 Sharp Corp Optical information processor
JPS62113419U (en) * 1985-12-28 1987-07-18
JPS63200327A (en) * 1987-02-13 1988-08-18 Olympus Optical Co Ltd Optical pickup device
US5250796A (en) * 1991-09-09 1993-10-05 Kabushiki Kaisha Toshiba Noise reduction system for optical record and reproduction apparatus using auto-power controlled semiconductor laser device
JPH07262592A (en) * 1995-03-27 1995-10-13 Mitsubishi Electric Corp Magnetooptical information recording and reproducing device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS558005A (en) * 1978-06-30 1980-01-21 Hitachi Ltd Bonding pad substructure
JPS5644129A (en) * 1979-09-19 1981-04-23 Hitachi Ltd Optical recording and reproducing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS558005A (en) * 1978-06-30 1980-01-21 Hitachi Ltd Bonding pad substructure
JPS5644129A (en) * 1979-09-19 1981-04-23 Hitachi Ltd Optical recording and reproducing device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61187135A (en) * 1985-02-15 1986-08-20 Mitsubishi Electric Corp Optical device
JPS62140253A (en) * 1985-12-13 1987-06-23 Sharp Corp Optical information processor
JPS62113419U (en) * 1985-12-28 1987-07-18
JPS63200327A (en) * 1987-02-13 1988-08-18 Olympus Optical Co Ltd Optical pickup device
US5250796A (en) * 1991-09-09 1993-10-05 Kabushiki Kaisha Toshiba Noise reduction system for optical record and reproduction apparatus using auto-power controlled semiconductor laser device
JPH07262592A (en) * 1995-03-27 1995-10-13 Mitsubishi Electric Corp Magnetooptical information recording and reproducing device

Also Published As

Publication number Publication date
JPS6226098B2 (en) 1987-06-06

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