JPS57154659A - Optical type information reproducing device - Google Patents

Optical type information reproducing device

Info

Publication number
JPS57154659A
JPS57154659A JP56041466A JP4146681A JPS57154659A JP S57154659 A JPS57154659 A JP S57154659A JP 56041466 A JP56041466 A JP 56041466A JP 4146681 A JP4146681 A JP 4146681A JP S57154659 A JPS57154659 A JP S57154659A
Authority
JP
Japan
Prior art keywords
semiconductor laser
light
light flux
radiated
output
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
JP56041466A
Other languages
Japanese (ja)
Other versions
JPS618495B2 (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 JP56041466A priority Critical patent/JPS57154659A/en
Publication of JPS57154659A publication Critical patent/JPS57154659A/en
Publication of JPS618495B2 publication Critical patent/JPS618495B2/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

Abstract

PURPOSE:To omit a half mirror from the entitled device and reduce the output of a semiconductor laser by fetching a noise correcting signal from light flux other than the one penetrated into a condensing lens out of the light radiated from the semiconductor laser. 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. Light flux which is not condensed by a condensing lens out of elliptically radiated light flux is received by a photo detector 23, its output signal is amplified by an amplifier 9 and the amplified output is fed backed negatively to the semiconductor laser 1, reducing the light source noises of the semiconductor laser 1.
JP56041466A 1981-03-20 1981-03-20 Optical type information reproducing device Granted JPS57154659A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56041466A JPS57154659A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56041466A JPS57154659A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Publications (2)

Publication Number Publication Date
JPS57154659A true JPS57154659A (en) 1982-09-24
JPS618495B2 JPS618495B2 (en) 1986-03-14

Family

ID=12609143

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56041466A Granted JPS57154659A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Country Status (1)

Country Link
JP (1) JPS57154659A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195606A2 (en) * 1985-03-13 1986-09-24 Sharp Kabushiki Kaisha Optical head in an optical memory device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195606A2 (en) * 1985-03-13 1986-09-24 Sharp Kabushiki Kaisha Optical head in an optical memory device

Also Published As

Publication number Publication date
JPS618495B2 (en) 1986-03-14

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