JPS61120352A - 焦点誤差検出装置 - Google Patents

焦点誤差検出装置

Info

Publication number
JPS61120352A
JPS61120352A JP59241176A JP24117684A JPS61120352A JP S61120352 A JPS61120352 A JP S61120352A JP 59241176 A JP59241176 A JP 59241176A JP 24117684 A JP24117684 A JP 24117684A JP S61120352 A JPS61120352 A JP S61120352A
Authority
JP
Japan
Prior art keywords
light
convex lens
optical element
recording medium
objective lens
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
JP59241176A
Other languages
English (en)
Japanese (ja)
Other versions
JPH043572B2 (OSRAM
Inventor
Toru Nakamura
徹 中村
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59241176A priority Critical patent/JPS61120352A/ja
Publication of JPS61120352A publication Critical patent/JPS61120352A/ja
Publication of JPH043572B2 publication Critical patent/JPH043572B2/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

  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
JP59241176A 1984-11-15 1984-11-15 焦点誤差検出装置 Granted JPS61120352A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59241176A JPS61120352A (ja) 1984-11-15 1984-11-15 焦点誤差検出装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59241176A JPS61120352A (ja) 1984-11-15 1984-11-15 焦点誤差検出装置

Publications (2)

Publication Number Publication Date
JPS61120352A true JPS61120352A (ja) 1986-06-07
JPH043572B2 JPH043572B2 (OSRAM) 1992-01-23

Family

ID=17070370

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59241176A Granted JPS61120352A (ja) 1984-11-15 1984-11-15 焦点誤差検出装置

Country Status (1)

Country Link
JP (1) JPS61120352A (OSRAM)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6316432A (ja) * 1986-07-08 1988-01-23 Matsushita Electric Ind Co Ltd 焦点誤差検出装置
US5315574A (en) * 1988-10-28 1994-05-24 Matsushita Electric Industrial Co., Ltd. Optical head with polarized beam hologram

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6316432A (ja) * 1986-07-08 1988-01-23 Matsushita Electric Ind Co Ltd 焦点誤差検出装置
US5315574A (en) * 1988-10-28 1994-05-24 Matsushita Electric Industrial Co., Ltd. Optical head with polarized beam hologram

Also Published As

Publication number Publication date
JPH043572B2 (OSRAM) 1992-01-23

Similar Documents

Publication Publication Date Title
US5189655A (en) Optical head for optical disk recording/reproducing apparatus including modified wollaston prism
EP0201917B1 (en) Optical system for an optical memory
US4654519A (en) Optical head
US5768031A (en) Objective lens
JPS61261837A (ja) 消去可能な光ヘツド
US5901132A (en) Pickup head having two laser light sources for separately reading an optical disk with two recording layers
JPS61120352A (ja) 焦点誤差検出装置
JPS61282809A (ja) 焦点誤差検出装置
JPH02173937A (ja) 光記録再生装置
JPH0546620B2 (OSRAM)
JPH0294121A (ja) 焦点誤差検出装置
JPS61280033A (ja) 焦点誤差検出装置
JP2699986B2 (ja) 光ヘッドの焦点誤差を検出するための装置
JPH011124A (ja) 光学ヘッド
JPH051532B2 (OSRAM)
JP2643287B2 (ja) 光検出器
JPS62264444A (ja) 光学式記録再生装置
JPS63229629A (ja) 光学ヘツド
JPS6316432A (ja) 焦点誤差検出装置
JPH02168469A (ja) 光磁気ディスク用光学ヘッド
JPS63302428A (ja) 光学ヘッド
JPH01106340A (ja) 光学ヘッド
JPS60205839A (ja) 光学ヘツド
JPS63124236A (ja) 光学式記録再生装置
JPH02158923A (ja) 光ピックアップ装置