JPS6472334A - Optical pickup device - Google Patents

Optical pickup device

Info

Publication number
JPS6472334A
JPS6472334A JP62227999A JP22799987A JPS6472334A JP S6472334 A JPS6472334 A JP S6472334A JP 62227999 A JP62227999 A JP 62227999A JP 22799987 A JP22799987 A JP 22799987A JP S6472334 A JPS6472334 A JP S6472334A
Authority
JP
Japan
Prior art keywords
light
track signal
detecting
track
order light
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
JP62227999A
Other languages
Japanese (ja)
Inventor
Hiroshi Goto
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP62227999A priority Critical patent/JPS6472334A/en
Publication of JPS6472334A publication Critical patent/JPS6472334A/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
    • G11B7/0901—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 track following only
    • 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
    • G11B7/13—Optical detectors therefor
    • G11B7/131—Arrangement of detectors in a multiple array

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To execute an exact tracking control by detecting independently a 0th-order light, detecting an optical axis shift quantity which follows up a displacement of a moving optical system, and correcting a track signal. CONSTITUTION:The titled device is provided with a four-split photodetector 25 provided with each light receiving area 25A, 25B for detecting a track signal by receiving a + 1st order light and a - 1st order light in a reflected light from a track of an optical information recording medium 1, and two-split light receiving areas 25C, 25D for detecting an optical axis shift quantity for correcting an offset of a track signal by receiving a 0th-order light in the reflected light from the track. By using this photodetector 25, the optical axis shift quantity is detected from the 0th-order light 20 received by the light receiving areas 25C, 25D, a correction is applied to the track signal received and detected by the light receiving areas 25A, 25B, and the track signal which has cancelled an offset is obtained. In such a way, even if an offset is generated in the track signal, its influence can be eliminated, and an exact tracking control can be executed.
JP62227999A 1987-09-11 1987-09-11 Optical pickup device Pending JPS6472334A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62227999A JPS6472334A (en) 1987-09-11 1987-09-11 Optical pickup device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62227999A JPS6472334A (en) 1987-09-11 1987-09-11 Optical pickup device

Publications (1)

Publication Number Publication Date
JPS6472334A true JPS6472334A (en) 1989-03-17

Family

ID=16869592

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62227999A Pending JPS6472334A (en) 1987-09-11 1987-09-11 Optical pickup device

Country Status (1)

Country Link
JP (1) JPS6472334A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7072268B2 (en) 2002-07-05 2006-07-04 Kabushiki Kaisha Toshiba Optical pickup apparatus, optical disk apparatus, and tracking error signal detection method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7072268B2 (en) 2002-07-05 2006-07-04 Kabushiki Kaisha Toshiba Optical pickup apparatus, optical disk apparatus, and tracking error signal detection method

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