JPH0332141B2 - - Google Patents

Info

Publication number
JPH0332141B2
JPH0332141B2 JP58119389A JP11938983A JPH0332141B2 JP H0332141 B2 JPH0332141 B2 JP H0332141B2 JP 58119389 A JP58119389 A JP 58119389A JP 11938983 A JP11938983 A JP 11938983A JP H0332141 B2 JPH0332141 B2 JP H0332141B2
Authority
JP
Japan
Prior art keywords
light
photodetector
lens
objective lens
light beam
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.)
Expired - Lifetime
Application number
JP58119389A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6010425A (ja
Inventor
Hideo Ando
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
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 Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Priority to JP58119389A priority Critical patent/JPS6010425A/ja
Priority to US06/625,792 priority patent/US4654516A/en
Publication of JPS6010425A publication Critical patent/JPS6010425A/ja
Publication of JPH0332141B2 publication Critical patent/JPH0332141B2/ja
Granted 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • 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
    • G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in 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
    • G11B7/08—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
    • G11B7/0916—Foucault or knife-edge methods
    • 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
    • G11B7/0948—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 specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts
    • 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
    • G11B7/0909—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 by astigmatic methods

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
JP58119389A 1983-06-30 1983-06-30 光学ヘツド Granted JPS6010425A (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP58119389A JPS6010425A (ja) 1983-06-30 1983-06-30 光学ヘツド
US06/625,792 US4654516A (en) 1983-06-30 1984-06-28 Optical head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58119389A JPS6010425A (ja) 1983-06-30 1983-06-30 光学ヘツド

Publications (2)

Publication Number Publication Date
JPS6010425A JPS6010425A (ja) 1985-01-19
JPH0332141B2 true JPH0332141B2 (en, 2012) 1991-05-10

Family

ID=14760286

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58119389A Granted JPS6010425A (ja) 1983-06-30 1983-06-30 光学ヘツド

Country Status (2)

Country Link
US (1) US4654516A (en, 2012)
JP (1) JPS6010425A (en, 2012)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0695425B2 (ja) * 1987-04-15 1994-11-24 パイオニア株式会社 デイスク検出方式
US5253239A (en) * 1989-11-24 1993-10-12 Matsushita Electric Industrial Co., Ltd. Control apparatus for tracking a light beam on a track of an optical recording medium
TW351807B (en) * 1997-10-14 1999-02-01 Industrial Tech Institute Method and apparatus for testing focus and track of optical head of CD player testing on focus and track for optical head of CD player

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2325953A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Senseur optique de focalisation et dispositif de focalisation comportant un tel senseur
JPS559263A (en) * 1978-07-03 1980-01-23 Nec Corp System operation system
JPS56133704A (en) * 1980-03-24 1981-10-20 Matsushita Electric Ind Co Ltd Focus error detector
EP0070552B1 (en) * 1981-07-20 1990-06-27 Kabushiki Kaisha Toshiba Optical head

Also Published As

Publication number Publication date
US4654516A (en) 1987-03-31
JPS6010425A (ja) 1985-01-19

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