JPS573232A - Detecting method for track on optical disk - Google Patents

Detecting method for track on optical disk

Info

Publication number
JPS573232A
JPS573232A JP7637980A JP7637980A JPS573232A JP S573232 A JPS573232 A JP S573232A JP 7637980 A JP7637980 A JP 7637980A JP 7637980 A JP7637980 A JP 7637980A JP S573232 A JPS573232 A JP S573232A
Authority
JP
Japan
Prior art keywords
track
optical disk
speed
optical head
optical
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
JP7637980A
Other languages
Japanese (ja)
Inventor
Masafumi Yokota
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7637980A priority Critical patent/JPS573232A/en
Publication of JPS573232A publication Critical patent/JPS573232A/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
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head

Landscapes

  • Moving Of Head For Track Selection And Changing (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To perform accurate and high-speed track detection by moving an optical head in the redius direction of an optical disk at a prescribed speed and by obtaining a track detection signal by extracting a frequency component generated when the optical head crosses a track. CONSTITUTION:An optical head 11 is positioned at the outermost circumference of an optical disk 1 to focus reproducing beam light on the outermost circumferential track 2. The optical disk is rotated at a prescribed speed and the optical head 11 is moved in the radius direction of the optical disk 1 at a 1.5m/s speed, for example, so that the reproducing beam light starts scanning from the outermost circumference of the track 2. Its reflected light from the track 2 is detected by a photoelectric converter 21 and a frequency component when the optical head 11 crosses the track 2 is extracted through a preamplifier 22 and an LPF and inputted to a binary-coding circuit 24 to output a track detection signal. Consequently, accurate and high-speed track detection is achieved without being influenced by flaws dust, etc., on the optical disk 1.
JP7637980A 1980-06-06 1980-06-06 Detecting method for track on optical disk Pending JPS573232A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7637980A JPS573232A (en) 1980-06-06 1980-06-06 Detecting method for track on optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7637980A JPS573232A (en) 1980-06-06 1980-06-06 Detecting method for track on optical disk

Publications (1)

Publication Number Publication Date
JPS573232A true JPS573232A (en) 1982-01-08

Family

ID=13603698

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7637980A Pending JPS573232A (en) 1980-06-06 1980-06-06 Detecting method for track on optical disk

Country Status (1)

Country Link
JP (1) JPS573232A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999021180A1 (en) * 1997-10-20 1999-04-29 Fujitsu Limited Optical recording medium drive

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5224027A (en) * 1975-08-19 1977-02-23 Matsushita Electric Ind Co Ltd Record regenerator
JPS52152704A (en) * 1976-04-23 1977-12-19 Thomson Brandt Optical data disk reader

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5224027A (en) * 1975-08-19 1977-02-23 Matsushita Electric Ind Co Ltd Record regenerator
JPS52152704A (en) * 1976-04-23 1977-12-19 Thomson Brandt Optical data disk reader

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999021180A1 (en) * 1997-10-20 1999-04-29 Fujitsu Limited Optical recording medium drive
US6646961B1 (en) 1997-10-20 2003-11-11 Fujitsu Limited Optical recording medium driving apparatus

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