JPS57154658A - Optical type information reproducing device - Google Patents

Optical type information reproducing device

Info

Publication number
JPS57154658A
JPS57154658A JP56041465A JP4146581A JPS57154658A JP S57154658 A JPS57154658 A JP S57154658A JP 56041465 A JP56041465 A JP 56041465A JP 4146581 A JP4146581 A JP 4146581A JP S57154658 A JPS57154658 A JP S57154658A
Authority
JP
Japan
Prior art keywords
light flux
polarization beam
beam splitter
penetrated
reflected
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
JP56041465A
Other languages
Japanese (ja)
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 JP56041465A priority Critical patent/JPS57154658A/en
Publication of JPS57154658A publication Critical patent/JPS57154658A/en
Pending 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

Abstract

PURPOSE:To omit a half mirror in the entitled device by fetching a noise correcting signal from the light flux reflected when irradiated light flux is penetrated into a polarization beam splitter or the one penetrated when the irradiated light flux is reflected by the polarization beam splitter. CONSTITUTION:A part of the light radiated from a semiconductor laser 1 is condensed by a light spot 16 to read out data on a disk 17 and the reflected light flux is converted into an electric signal by a photo detector 21. Out of the light flux 4 incident upon a polarization beam splitter 11, the light flux 23 penetrated into the splitter is received by a photo detector 8 and amplified by an amplifier and its output 10 modulates the semiconductor laser 1. A closed loop system consisting of the semiconductor 1, a collimater lens 3, the polarization beam splitter 11, the photo detector 8, and the amplifier 9 is so constituted as to be a negative feedback system, reducing the noises of the semiconductor laser.
JP56041465A 1981-03-20 1981-03-20 Optical type information reproducing device Pending JPS57154658A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56041465A JPS57154658A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56041465A JPS57154658A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Publications (1)

Publication Number Publication Date
JPS57154658A true JPS57154658A (en) 1982-09-24

Family

ID=12609118

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56041465A Pending JPS57154658A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Country Status (1)

Country Link
JP (1) JPS57154658A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62124641A (en) * 1985-11-22 1987-06-05 Mitsubishi Electric Corp Optical magnetic 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62124641A (en) * 1985-11-22 1987-06-05 Mitsubishi Electric Corp Optical magnetic information recording and reproducing device

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