JPS6059545A - 光ヘッドの焦点ずれ検出装置 - Google Patents

光ヘッドの焦点ずれ検出装置

Info

Publication number
JPS6059545A
JPS6059545A JP16782183A JP16782183A JPS6059545A JP S6059545 A JPS6059545 A JP S6059545A JP 16782183 A JP16782183 A JP 16782183A JP 16782183 A JP16782183 A JP 16782183A JP S6059545 A JPS6059545 A JP S6059545A
Authority
JP
Japan
Prior art keywords
reflected light
light beam
reflected
photodetector
focus adjustment
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
JP16782183A
Other languages
English (en)
Japanese (ja)
Other versions
JPH0237609B2 (forum.php
Inventor
Shinsuke Shikama
信介 鹿間
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP16782183A priority Critical patent/JPS6059545A/ja
Publication of JPS6059545A publication Critical patent/JPS6059545A/ja
Publication of JPH0237609B2 publication Critical patent/JPH0237609B2/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

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP16782183A 1983-09-12 1983-09-12 光ヘッドの焦点ずれ検出装置 Granted JPS6059545A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16782183A JPS6059545A (ja) 1983-09-12 1983-09-12 光ヘッドの焦点ずれ検出装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16782183A JPS6059545A (ja) 1983-09-12 1983-09-12 光ヘッドの焦点ずれ検出装置

Publications (2)

Publication Number Publication Date
JPS6059545A true JPS6059545A (ja) 1985-04-05
JPH0237609B2 JPH0237609B2 (forum.php) 1990-08-27

Family

ID=15856715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16782183A Granted JPS6059545A (ja) 1983-09-12 1983-09-12 光ヘッドの焦点ずれ検出装置

Country Status (1)

Country Link
JP (1) JPS6059545A (forum.php)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62142725U (forum.php) * 1986-02-28 1987-09-09
EP0201917A3 (en) * 1985-05-15 1987-11-11 Kabushiki Kaisha Toshiba Optical system for an optical memory
US5253237A (en) * 1989-06-06 1993-10-12 Sharp Kabushiki Kaisha Optical head device
US5315574A (en) * 1988-10-28 1994-05-24 Matsushita Electric Industrial Co., Ltd. Optical head with polarized beam hologram

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5078341A (forum.php) * 1973-10-01 1975-06-26

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5078341A (forum.php) * 1973-10-01 1975-06-26

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0201917A3 (en) * 1985-05-15 1987-11-11 Kabushiki Kaisha Toshiba Optical system for an optical memory
JPS62142725U (forum.php) * 1986-02-28 1987-09-09
US5315574A (en) * 1988-10-28 1994-05-24 Matsushita Electric Industrial Co., Ltd. Optical head with polarized beam hologram
US5253237A (en) * 1989-06-06 1993-10-12 Sharp Kabushiki Kaisha Optical head device

Also Published As

Publication number Publication date
JPH0237609B2 (forum.php) 1990-08-27

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees