JPS63183631A - フオ−カシングエラ−検出装置 - Google Patents

フオ−カシングエラ−検出装置

Info

Publication number
JPS63183631A
JPS63183631A JP62013611A JP1361187A JPS63183631A JP S63183631 A JPS63183631 A JP S63183631A JP 62013611 A JP62013611 A JP 62013611A JP 1361187 A JP1361187 A JP 1361187A JP S63183631 A JPS63183631 A JP S63183631A
Authority
JP
Japan
Prior art keywords
beam spot
objective lens
collimator lens
lens
focusing error
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.)
Granted
Application number
JP62013611A
Other languages
English (en)
Japanese (ja)
Other versions
JPH059850B2 (enrdf_load_stackoverflow
Inventor
Nobuo Ogata
伸夫 緒方
Yoshio Yoshida
吉田　圭男
Teruaki Inoue
井上　輝晃
Yukio Kurata
幸夫 倉田
Yasuo Nakada
泰男 中田
Hideo Sato
佐藤　秀朗
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP62013611A priority Critical patent/JPS63183631A/ja
Priority to EP87306575A priority patent/EP0255305B1/en
Priority to CA000542944A priority patent/CA1319194C/en
Priority to US07/078,773 priority patent/US4812638A/en
Publication of JPS63183631A publication Critical patent/JPS63183631A/ja
Publication of JPH059850B2 publication Critical patent/JPH059850B2/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
    • G11B7/08—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
    • 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
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • G11B7/13922—Means for controlling the beam wavefront, e.g. for correction of aberration passive
    • 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
    • G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP62013611A 1986-07-28 1987-01-23 フオ−カシングエラ−検出装置 Granted JPS63183631A (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP62013611A JPS63183631A (ja) 1987-01-23 1987-01-23 フオ−カシングエラ−検出装置
EP87306575A EP0255305B1 (en) 1986-07-28 1987-07-24 Focusing error detecting device and method of manufacturing the same
CA000542944A CA1319194C (en) 1986-07-28 1987-07-24 Focusing error detector and optical data detecting device incorporating the focusing error detector
US07/078,773 US4812638A (en) 1986-07-28 1987-07-28 Focusing error detector and optical data detecting device incorporating the focusing error detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62013611A JPS63183631A (ja) 1987-01-23 1987-01-23 フオ−カシングエラ−検出装置

Publications (2)

Publication Number Publication Date
JPS63183631A true JPS63183631A (ja) 1988-07-29
JPH059850B2 JPH059850B2 (enrdf_load_stackoverflow) 1993-02-08

Family

ID=11838020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62013611A Granted JPS63183631A (ja) 1986-07-28 1987-01-23 フオ−カシングエラ−検出装置

Country Status (1)

Country Link
JP (1) JPS63183631A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100551118B1 (ko) * 1998-12-30 2006-05-11 엘지전자 주식회사 광픽업장치

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100551118B1 (ko) * 1998-12-30 2006-05-11 엘지전자 주식회사 광픽업장치

Also Published As

Publication number Publication date
JPH059850B2 (enrdf_load_stackoverflow) 1993-02-08

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term