JPS5638A - Scanning position detector for recording and reproducing unit - Google Patents

Scanning position detector for recording and reproducing unit

Info

Publication number
JPS5638A
JPS5638A JP7481479A JP7481479A JPS5638A JP S5638 A JPS5638 A JP S5638A JP 7481479 A JP7481479 A JP 7481479A JP 7481479 A JP7481479 A JP 7481479A JP S5638 A JPS5638 A JP S5638A
Authority
JP
Japan
Prior art keywords
recording
signal
disc
position detector
transformer
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
JP7481479A
Other languages
Japanese (ja)
Inventor
Hideo Okamura
Shunji Kanamaru
Akira Ichinose
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP7481479A priority Critical patent/JPS5638A/en
Publication of JPS5638A publication Critical patent/JPS5638A/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
    • G11B7/12—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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Moving Of Head For Track Selection And Changing (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To make stable the recording and reproducting of the information signal, by providing the position detector detecting the recording and reproducing position toward the radial direction of the disc, and controlling the light power and frequency characteristics of reproducing signal at recording with the output signal. CONSTITUTION:The magnetic substance plate 27 is constituted with the same material as the transformer 25 to give a slope corresponding to the diameter of the disc 15. This magnetic substance plate 27 is located to the part of the gap 25' of the transformer 25 and it is moved toward the arrow D together with the optical carrier 17, to obtain the signal I' corresponding to the location of the magnetic plate 27. That is, the signal I' corresponding to the carrier position of the optical carrier 17, that is, the recording or reproduced position of the disc 15, can be obtained. The position signal detected at the position detector 22 is input to the recording power control circuit 24 and the compensation circuit 21 via the amplifier 23. Thus, the information signal stable for external and internal circumferences of the disc 15 can be recorded or reproduced.
JP7481479A 1979-06-13 1979-06-13 Scanning position detector for recording and reproducing unit Pending JPS5638A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7481479A JPS5638A (en) 1979-06-13 1979-06-13 Scanning position detector for recording and reproducing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7481479A JPS5638A (en) 1979-06-13 1979-06-13 Scanning position detector for recording and reproducing unit

Publications (1)

Publication Number Publication Date
JPS5638A true JPS5638A (en) 1981-01-06

Family

ID=13558149

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7481479A Pending JPS5638A (en) 1979-06-13 1979-06-13 Scanning position detector for recording and reproducing unit

Country Status (1)

Country Link
JP (1) JPS5638A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60227689A (en) * 1985-04-05 1985-11-12 Nitto Electric Ind Co Ltd Production of acrylic ester by microorganism producing the same
JPS60227688A (en) * 1985-04-05 1985-11-12 Nitto Electric Ind Co Ltd Production of acrylic ester by microorganism producing the same
JPH01104187A (en) * 1987-10-19 1989-04-21 Shoichi Shimizu Enzymatic production of cyclic lactone

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60227689A (en) * 1985-04-05 1985-11-12 Nitto Electric Ind Co Ltd Production of acrylic ester by microorganism producing the same
JPS60227688A (en) * 1985-04-05 1985-11-12 Nitto Electric Ind Co Ltd Production of acrylic ester by microorganism producing the same
JPH01104187A (en) * 1987-10-19 1989-04-21 Shoichi Shimizu Enzymatic production of cyclic lactone

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