JPS57154660A - Optical type information reproducing device - Google Patents

Optical type information reproducing device

Info

Publication number
JPS57154660A
JPS57154660A JP56041468A JP4146881A JPS57154660A JP S57154660 A JPS57154660 A JP S57154660A JP 56041468 A JP56041468 A JP 56041468A JP 4146881 A JP4146881 A JP 4146881A JP S57154660 A JPS57154660 A JP S57154660A
Authority
JP
Japan
Prior art keywords
light flux
reflected
semiconductor laser
flux
divided
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
JP56041468A
Other languages
Japanese (ja)
Other versions
JPH0247015B2 (en
Inventor
Mitsushige Kondo
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 JP56041468A priority Critical patent/JPS57154660A/en
Publication of JPS57154660A publication Critical patent/JPS57154660A/en
Publication of JPH0247015B2 publication Critical patent/JPH0247015B2/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
    • 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
    • H01S5/06817—Noise reduction

Landscapes

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

Abstract

PURPOSE:To simplify the entitled optical system by using a half mirror penetrating reflected light flux into a photo detector and suppressing the back-talk noise of the light radiated from a semiconductor laser by the negative feedback of a signal which has detected a part of the radiated light. CONSTITUTION:Light radiated from a semiconductor laser 1 is made to parallel light flux 4, which is divided into parallel light flux 18 and irradiating light flux 4, which is divided into parallel light flux 18 and irradiating light flux 6 by a half mirror 17. The irradiating light flux 6 is reflected on a disk 11, the reflected light flux 7 is divided into reflected light flux 19 and 20 and a data signal is reproduced from the reflected lighr flux 19. In order to reduce back-talk noise which increases when the reflected light 20 is penetrated again into the semiconductor laser 1, the parallel light flux 18 is converted into an electric signal by a photo detector 21 and fed backed negatively to the semiconductor laser 1 through an amplifier 22.
JP56041468A 1981-03-20 1981-03-20 Optical type information reproducing device Granted JPS57154660A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56041468A JPS57154660A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56041468A JPS57154660A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Publications (2)

Publication Number Publication Date
JPS57154660A true JPS57154660A (en) 1982-09-24
JPH0247015B2 JPH0247015B2 (en) 1990-10-18

Family

ID=12609199

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56041468A Granted JPS57154660A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Country Status (1)

Country Link
JP (1) JPS57154660A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5276003A (en) * 1975-12-22 1977-06-25 Victor Co Of Japan Ltd Optical information recording system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5276003A (en) * 1975-12-22 1977-06-25 Victor Co Of Japan Ltd Optical information recording system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPH0247015B2 (en) 1990-10-18

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