JPH0447896B2 - - Google Patents

Info

Publication number
JPH0447896B2
JPH0447896B2 JP59182613A JP18261384A JPH0447896B2 JP H0447896 B2 JPH0447896 B2 JP H0447896B2 JP 59182613 A JP59182613 A JP 59182613A JP 18261384 A JP18261384 A JP 18261384A JP H0447896 B2 JPH0447896 B2 JP H0447896B2
Authority
JP
Japan
Prior art keywords
parallel plate
laser beam
photodetector
optical
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.)
Expired - Lifetime
Application number
JP59182613A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6161240A (ja
Inventor
Yoshihiro Katase
Masayuki Inoe
Toshio Sugyama
Tadashi Okuda
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP18261384A priority Critical patent/JPS6161240A/ja
Publication of JPS6161240A publication Critical patent/JPS6161240A/ja
Publication of JPH0447896B2 publication Critical patent/JPH0447896B2/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)
JP18261384A 1984-09-03 1984-09-03 光学式信号再生装置 Granted JPS6161240A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18261384A JPS6161240A (ja) 1984-09-03 1984-09-03 光学式信号再生装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18261384A JPS6161240A (ja) 1984-09-03 1984-09-03 光学式信号再生装置

Publications (2)

Publication Number Publication Date
JPS6161240A JPS6161240A (ja) 1986-03-29
JPH0447896B2 true JPH0447896B2 (US07943777-20110517-C00090.png) 1992-08-05

Family

ID=16121348

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18261384A Granted JPS6161240A (ja) 1984-09-03 1984-09-03 光学式信号再生装置

Country Status (1)

Country Link
JP (1) JPS6161240A (US07943777-20110517-C00090.png)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61202339A (ja) * 1985-03-05 1986-09-08 Konishiroku Photo Ind Co Ltd 光ピツクアツプ
JPS61236035A (ja) * 1985-04-09 1986-10-21 Sony Corp 光学ヘツド

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4916823A (US07943777-20110517-C00090.png) * 1972-04-20 1974-02-14
JPS5439101A (en) * 1977-08-30 1979-03-26 Olympus Optical Co Ltd Automatic focusing method
JPS5657013A (en) * 1979-09-28 1981-05-19 Philips Nv Focus error detector
JPS57205833A (en) * 1981-06-12 1982-12-17 Sony Corp Optical reproducing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4916823A (US07943777-20110517-C00090.png) * 1972-04-20 1974-02-14
JPS5439101A (en) * 1977-08-30 1979-03-26 Olympus Optical Co Ltd Automatic focusing method
JPS5657013A (en) * 1979-09-28 1981-05-19 Philips Nv Focus error detector
JPS57205833A (en) * 1981-06-12 1982-12-17 Sony Corp Optical reproducing device

Also Published As

Publication number Publication date
JPS6161240A (ja) 1986-03-29

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term