JPS5517818A - Procedure of focus initialization setting in optical recording unit and its equipment - Google Patents

Procedure of focus initialization setting in optical recording unit and its equipment

Info

Publication number
JPS5517818A
JPS5517818A JP8878378A JP8878378A JPS5517818A JP S5517818 A JPS5517818 A JP S5517818A JP 8878378 A JP8878378 A JP 8878378A JP 8878378 A JP8878378 A JP 8878378A JP S5517818 A JPS5517818 A JP S5517818A
Authority
JP
Japan
Prior art keywords
recording
small hole
laser
forcusing
power source
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
JP8878378A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6120930B2 (enrdf_load_stackoverflow
Inventor
Seio Watanabe
Satoru Komurasaki
Kazuo Hirasawa
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 JP8878378A priority Critical patent/JPS5517818A/ja
Publication of JPS5517818A publication Critical patent/JPS5517818A/ja
Publication of JPS6120930B2 publication Critical patent/JPS6120930B2/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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)
JP8878378A 1978-07-20 1978-07-20 Procedure of focus initialization setting in optical recording unit and its equipment Granted JPS5517818A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8878378A JPS5517818A (en) 1978-07-20 1978-07-20 Procedure of focus initialization setting in optical recording unit and its equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8878378A JPS5517818A (en) 1978-07-20 1978-07-20 Procedure of focus initialization setting in optical recording unit and its equipment

Publications (2)

Publication Number Publication Date
JPS5517818A true JPS5517818A (en) 1980-02-07
JPS6120930B2 JPS6120930B2 (enrdf_load_stackoverflow) 1986-05-24

Family

ID=13952437

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8878378A Granted JPS5517818A (en) 1978-07-20 1978-07-20 Procedure of focus initialization setting in optical recording unit and its equipment

Country Status (1)

Country Link
JP (1) JPS5517818A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57186238A (en) * 1981-03-10 1982-11-16 Sanyo Electric Co Ltd Focusing mechanism
JPS5815026A (ja) * 1981-07-16 1983-01-28 Mitsubishi Chem Ind Ltd 副生硫安の製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57186238A (en) * 1981-03-10 1982-11-16 Sanyo Electric Co Ltd Focusing mechanism
JPS5815026A (ja) * 1981-07-16 1983-01-28 Mitsubishi Chem Ind Ltd 副生硫安の製造方法

Also Published As

Publication number Publication date
JPS6120930B2 (enrdf_load_stackoverflow) 1986-05-24

Similar Documents

Publication Publication Date Title
JPS54143109A (en) Optical information device
JPS57162137A (en) Photomagnetic recording and reproducing system
JPS5280802A (en) Optical type information recording and reproduction apparatus
JPS5517818A (en) Procedure of focus initialization setting in optical recording unit and its equipment
JPS55122240A (en) Optical recording and reproducing device
JPS5424002A (en) Reproducer of optical information recording medium discs
JPS54133305A (en) Information recorder
JPS5641A (en) Processor for optical information
JPS558006A (en) Semi-conductor laser output stabilizing method and device therefore
JPS57200912A (en) Information recording system
JPS53110805A (en) Optical information recording/reproducing device
JPS53132308A (en) Focus controller of optical reproducer
JPS55101142A (en) Focus detection unit of optical reproducing device
JPS52134705A (en) Optical recorder/reproducer unit
JPS57172306A (en) Focus controller of optical recording system
JPS54102109A (en) Focusing method of optical recorder
JPS5231622A (en) Optical information reader
JPS53147507A (en) Focus position controller
JPS56148745A (en) Optical recorder and reproducer
JPS53129604A (en) Optical recorder-reproducer
JPS55153135A (en) Optical recording and reproducing device
JPS5644129A (en) Optical recording and reproducing device
JPS5577042A (en) Optical information recording and reproducing device
JPS54103307A (en) Optical recorder-reproducer
JPS5250703A (en) Optical reading device for recording materials