JPH0237609B2 - - Google Patents

Info

Publication number
JPH0237609B2
JPH0237609B2 JP58167821A JP16782183A JPH0237609B2 JP H0237609 B2 JPH0237609 B2 JP H0237609B2 JP 58167821 A JP58167821 A JP 58167821A JP 16782183 A JP16782183 A JP 16782183A JP H0237609 B2 JPH0237609 B2 JP H0237609B2
Authority
JP
Japan
Prior art keywords
photodetector
detection device
light beam
focus shift
reflected 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.)
Expired - Lifetime
Application number
JP58167821A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6059545A (ja
Inventor
Shinsuke Shikama
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 JPS6059545A (ja) 1985-04-05
JPH0237609B2 true JPH0237609B2 (en]) 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 (en])

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4797868A (en) * 1985-05-15 1989-01-10 Kabushiki Kaisha Toshiba Optical system employing a laser beam for focusing, tracking and transferring information signals with respect to a magneto-optical memory
JPS62142725U (en]) * 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
KR940001999B1 (ko) * 1989-06-06 1994-03-12 샤프 가부시끼가이샤 광 픽업장치

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2445333A1 (de) * 1973-10-01 1975-04-10 Philips Nv Optoelektronisches system zur bestimmung einer abweichung zwischen der istlage und der sollage einer ebene in einem optischen abbildungssystem

Also Published As

Publication number Publication date
JPS6059545A (ja) 1985-04-05

Similar Documents

Publication Publication Date Title
US5313441A (en) Optical recording and reproducing apparatus having a pickup head including a main prism with reflecting surfaces for splitting the reflected beam
JPH0237609B2 (en])
JPH0734264B2 (ja) 光学式情報記録再生装置
JPS6322370B2 (en])
JPH07107742B2 (ja) 光デイスクヘツドのフオーカスずれ検出装置
US5426630A (en) Optical pickup system
JPS6012693B2 (ja) 光学的情報再生装置における自動焦点合せ装置
JPH0417125A (ja) 光記録再生装置
JPS6223376B2 (en])
JPH0214434A (ja) 焦点制御装置
JP3071013B2 (ja) 光ピックアップ装置
JP3439363B2 (ja) 光学ピックアップ装置
JPH02121130A (ja) 光ピックアップ装置及び光ディスク装置
JPS63257929A (ja) 光学式情報記録再生装置
JP2531904Y2 (ja) 焦点制御装置
JP3360382B2 (ja) 光ディスク用ピックアップと光ディスク装置
JP3740777B2 (ja) 受発光素子、光学ピックアップ装置及び光ディスク装置
JPS6412017B2 (en])
JPH058499B2 (en])
JPH1166609A (ja) 光ピックアップ装置及び製造方法
JPS6412016B2 (en])
JPH04265528A (ja) フォーカスエラー信号検出装置
JPH02173937A (ja) 光記録再生装置
JPH02158923A (ja) 光ピックアップ装置
JPS62137737A (ja) 光ヘツド装置

Legal Events

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