JPS567245A - Automatic focusing unit in optical information reproducing device - Google Patents

Automatic focusing unit in optical information reproducing device

Info

Publication number
JPS567245A
JPS567245A JP7968379A JP7968379A JPS567245A JP S567245 A JPS567245 A JP S567245A JP 7968379 A JP7968379 A JP 7968379A JP 7968379 A JP7968379 A JP 7968379A JP S567245 A JPS567245 A JP S567245A
Authority
JP
Japan
Prior art keywords
light flux
focus position
information
position slippage
disc
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
JP7968379A
Other languages
Japanese (ja)
Inventor
Fumio Akuwa
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan 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 Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP7968379A priority Critical patent/JPS567245A/en
Publication of JPS567245A publication Critical patent/JPS567245A/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
    • G11B7/09—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)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To perform automatic focusing without convergence of the focus position slippage detection laser light flux onto the information face of a video disc, by causing the light path distance from the convergence point of the focus position slippage detection laser light flux to the read lens main plane to differ from the corresponding light path distance of the information detection laser light flux. CONSTITUTION:Since distance l1 between lens main plane 6A and convergence point B for focus position slippage detection light flux 4b-1 is slightly longer than distance L1 between lens 6A and convergence point A for information detection light flux 4a-1, point C where focus position slippage detection light flux 4b-1 is converged by reading lens 6 is slipped to the front side of video disc 7. That is, light flux 4b-1 is not converged onto information face 7a of video disc 7, and the spot of this light flux on disc information face 7a becomes comparatively large diameter, and the recording signal on the disc is not disturbance to the focus position slippage control signal without reading of the tracking signal and the information signal.
JP7968379A 1979-06-26 1979-06-26 Automatic focusing unit in optical information reproducing device Pending JPS567245A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7968379A JPS567245A (en) 1979-06-26 1979-06-26 Automatic focusing unit in optical information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7968379A JPS567245A (en) 1979-06-26 1979-06-26 Automatic focusing unit in optical information reproducing device

Publications (1)

Publication Number Publication Date
JPS567245A true JPS567245A (en) 1981-01-24

Family

ID=13696993

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7968379A Pending JPS567245A (en) 1979-06-26 1979-06-26 Automatic focusing unit in optical information reproducing device

Country Status (1)

Country Link
JP (1) JPS567245A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59196672A (en) * 1983-04-22 1984-11-08 Sony Corp High speed phenomenon recording device
JPS59196673A (en) * 1983-04-22 1984-11-08 Sony Corp High speed phenomenon recording device
US4816665A (en) * 1987-08-06 1989-03-28 Maxtor Corporation Sensor array for focus detection

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59196672A (en) * 1983-04-22 1984-11-08 Sony Corp High speed phenomenon recording device
JPS59196673A (en) * 1983-04-22 1984-11-08 Sony Corp High speed phenomenon recording device
JPH0516233B2 (en) * 1983-04-22 1993-03-03 Sony Corp
US4816665A (en) * 1987-08-06 1989-03-28 Maxtor Corporation Sensor array for focus detection

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