JPS6227455B2 - - Google Patents

Info

Publication number
JPS6227455B2
JPS6227455B2 JP1021678A JP1021678A JPS6227455B2 JP S6227455 B2 JPS6227455 B2 JP S6227455B2 JP 1021678 A JP1021678 A JP 1021678A JP 1021678 A JP1021678 A JP 1021678A JP S6227455 B2 JPS6227455 B2 JP S6227455B2
Authority
JP
Japan
Prior art keywords
light
output
semiconductor laser
laser device
phase detector
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
Application number
JP1021678A
Other languages
English (en)
Japanese (ja)
Other versions
JPS54103306A (en
Inventor
Kazuo Okada
Mitsushige Kondo
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 JP1021678A priority Critical patent/JPS54103306A/ja
Priority to NL7812058A priority patent/NL186121C/xx
Priority to DE7979900037T priority patent/DE2862256D1/de
Priority to PCT/JP1978/000052 priority patent/WO1979000400A1/ja
Priority to EP79900037A priority patent/EP0007902B1/en
Publication of JPS54103306A publication Critical patent/JPS54103306A/ja
Publication of JPS6227455B2 publication Critical patent/JPS6227455B2/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
    • 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
    • G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
JP1021678A 1977-12-16 1978-01-31 Automatic focusing device Granted JPS54103306A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP1021678A JPS54103306A (en) 1978-01-31 1978-01-31 Automatic focusing device
NL7812058A NL186121C (nl) 1977-12-16 1978-12-12 Automatisch focusseerapparaat.
DE7979900037T DE2862256D1 (en) 1977-12-16 1978-12-13 Automatic focusing system
PCT/JP1978/000052 WO1979000400A1 (en) 1977-12-16 1978-12-13 Automatic focusing system
EP79900037A EP0007902B1 (en) 1977-12-16 1979-07-16 Automatic focusing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1021678A JPS54103306A (en) 1978-01-31 1978-01-31 Automatic focusing device

Publications (2)

Publication Number Publication Date
JPS54103306A JPS54103306A (en) 1979-08-14
JPS6227455B2 true JPS6227455B2 (enrdf_load_stackoverflow) 1987-06-15

Family

ID=11744063

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1021678A Granted JPS54103306A (en) 1977-12-16 1978-01-31 Automatic focusing device

Country Status (1)

Country Link
JP (1) JPS54103306A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63261539A (ja) * 1987-04-20 1988-10-28 Mitsubishi Electric Corp 焦点検出装置

Also Published As

Publication number Publication date
JPS54103306A (en) 1979-08-14

Similar Documents

Publication Publication Date Title
US4352981A (en) Photoelectric focus and tracking apparatus
US4363961A (en) Automatic focusing apparatus
JPS6218975B2 (enrdf_load_stackoverflow)
JPS6227455B2 (enrdf_load_stackoverflow)
JPS6243254B2 (enrdf_load_stackoverflow)
EP0007902A1 (en) Automatic focusing system
JPS58159248A (ja) 光デイスク装置のトラツキングサ−ボ方式
JPS5853033A (ja) 光学式記録情報再生装置
JPS6258049B2 (enrdf_load_stackoverflow)
KR960005480A (ko) 포커스에러 검출장치
JP2902283B2 (ja) 自動合焦装置
JPH0127489B2 (enrdf_load_stackoverflow)
KR890008765A (ko) 광학식 디스크 재생장치의 포커스 서치회로
JPS6232529B2 (enrdf_load_stackoverflow)
JPS63259845A (ja) 光ピツクアツプ装置
JPS5483849A (en) Automatic focusing device
JPH01150231A (ja) 光学的記録再生装置用ピックアップの光学系位置調整装置
JPH09297923A (ja) 光ディスク装置
JPH0695002A (ja) 光ピックアップ組付調整装置
JPS6152533B2 (enrdf_load_stackoverflow)
JPS6055890B2 (ja) 光学的情報記録再生装置
JPH02108247A (ja) 光ピックアップ装置
JPS60242522A (ja) 光学式情報再生装置
JPS6163931A (ja) 焦点調整装置
JPH0658287B2 (ja) 半導体レ−ザの戻り光雑音測定方法