JPS5641535A - Recording track detection circuit of optical disk - Google Patents

Recording track detection circuit of optical disk

Info

Publication number
JPS5641535A
JPS5641535A JP11495879A JP11495879A JPS5641535A JP S5641535 A JPS5641535 A JP S5641535A JP 11495879 A JP11495879 A JP 11495879A JP 11495879 A JP11495879 A JP 11495879A JP S5641535 A JPS5641535 A JP S5641535A
Authority
JP
Japan
Prior art keywords
optical disk
track
envelope
signal
detection circuit
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
JP11495879A
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 JP11495879A priority Critical patent/JPS5641535A/en
Publication of JPS5641535A publication Critical patent/JPS5641535A/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 The Head For Recording And Reproducing By Optical Means (AREA)
  • Moving Of Head For Track Selection And Changing (AREA)

Abstract

PURPOSE:To detect a track on the optical disk swiftly and exactly at all times, by detecting an envelope of frequency component of the recording information from the regenerative signal. CONSTITUTION:When the optical head is made to access in the radial direction on the optical disk, only the frequency component (FM signal component) of the recording information among the regenerative signals obtained from the photoelectric converter 1 is output from the band amplifier 3. When the envelope detector 4 detects the envelope of this output signal waveform and outputs it to the comparator 6, the comparator 6 compares it with the reference level L from the reference level generator 5, and outputs the result as a track detecting signal. As a result of the foregoing, a track can be detected swiftly and exactly at all times without being influenced by flaws, dust, etc. on the optical disk.
JP11495879A 1979-09-07 1979-09-07 Recording track detection circuit of optical disk Pending JPS5641535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11495879A JPS5641535A (en) 1979-09-07 1979-09-07 Recording track detection circuit of optical disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11495879A JPS5641535A (en) 1979-09-07 1979-09-07 Recording track detection circuit of optical disk

Publications (1)

Publication Number Publication Date
JPS5641535A true JPS5641535A (en) 1981-04-18

Family

ID=14650845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11495879A Pending JPS5641535A (en) 1979-09-07 1979-09-07 Recording track detection circuit of optical disk

Country Status (1)

Country Link
JP (1) JPS5641535A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176568A (en) * 1981-04-22 1982-10-29 Pioneer Electronic Corp Relative movement controller between pickup and recording track for information reader
JPS5813208A (en) * 1981-07-14 1983-01-25 Kayaba Ind Co Ltd Hydraulic control unit
JPS6133275U (en) * 1984-07-30 1986-02-28 パイオニア株式会社 track access device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176568A (en) * 1981-04-22 1982-10-29 Pioneer Electronic Corp Relative movement controller between pickup and recording track for information reader
JPS5813208A (en) * 1981-07-14 1983-01-25 Kayaba Ind Co Ltd Hydraulic control unit
JPS6361278B2 (en) * 1981-07-14 1988-11-28
JPS6133275U (en) * 1984-07-30 1986-02-28 パイオニア株式会社 track access device

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