JPS57154657A - Optical type information reproducing device - Google Patents

Optical type information reproducing device

Info

Publication number
JPS57154657A
JPS57154657A JP56041462A JP4146281A JPS57154657A JP S57154657 A JPS57154657 A JP S57154657A JP 56041462 A JP56041462 A JP 56041462A JP 4146281 A JP4146281 A JP 4146281A JP S57154657 A JPS57154657 A JP S57154657A
Authority
JP
Japan
Prior art keywords
light
light flux
penetrated
semiconductor laser
photo detector
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
JP56041462A
Other languages
Japanese (ja)
Other versions
JPS618494B2 (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 JP56041462A priority Critical patent/JPS57154657A/en
Publication of JPS57154657A publication Critical patent/JPS57154657A/en
Publication of JPS618494B2 publication Critical patent/JPS618494B2/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
    • 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
    • H01S5/06837—Stabilising otherwise than by an applied electric field or current, e.g. by controlling the temperature

Abstract

PURPOSE:To use semiconductor laser without selection by inserting an aperture in order to adjust laser light condensed on a disk surface and light flux penetrated into a photo detector to obtain noise correcting signals so as to distribute the light in the same distribution range. 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. To reduce the noises of the light source, a noise correcting signal 10 is fed backed negatively to the semiconductor laser 1. An aperture 23 is installed in order to adjust the 2nd light flux penetrated into a photo detector 8 for obtaining the noise correcting signal 10 so as to distribute the light flux 24 in the same distribution range B' as that B of the 1st light flux 6 which is penetrated into a focusing lens 15.
JP56041462A 1981-03-20 1981-03-20 Optical type information reproducing device Granted JPS57154657A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56041462A JPS57154657A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56041462A JPS57154657A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Publications (2)

Publication Number Publication Date
JPS57154657A true JPS57154657A (en) 1982-09-24
JPS618494B2 JPS618494B2 (en) 1986-03-14

Family

ID=12609033

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56041462A Granted JPS57154657A (en) 1981-03-20 1981-03-20 Optical type information reproducing device

Country Status (1)

Country Link
JP (1) JPS57154657A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7349320B2 (en) 2004-02-17 2008-03-25 Matsushita Electric Industrial Co., Ltd. Apparatus for switching modes based on quantity of light received in first section of a photodetector section and first plus second section for controlling a laser diode output

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0319595U (en) * 1989-06-30 1991-02-26
JPH0453494U (en) * 1990-09-05 1992-05-07

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7349320B2 (en) 2004-02-17 2008-03-25 Matsushita Electric Industrial Co., Ltd. Apparatus for switching modes based on quantity of light received in first section of a photodetector section and first plus second section for controlling a laser diode output

Also Published As

Publication number Publication date
JPS618494B2 (en) 1986-03-14

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