JPH0219536B2 - - Google Patents

Info

Publication number
JPH0219536B2
JPH0219536B2 JP55141174A JP14117480A JPH0219536B2 JP H0219536 B2 JPH0219536 B2 JP H0219536B2 JP 55141174 A JP55141174 A JP 55141174A JP 14117480 A JP14117480 A JP 14117480A JP H0219536 B2 JPH0219536 B2 JP H0219536B2
Authority
JP
Japan
Prior art keywords
light
track
information
error signal
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.)
Expired - Lifetime
Application number
JP55141174A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5766533A (en
Inventor
Kenichi Ito
Tooru Musha
Kiichi Kato
Masaaki Yamamoto
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.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP55141174A priority Critical patent/JPS5766533A/ja
Priority to US06/309,402 priority patent/US4525825A/en
Publication of JPS5766533A publication Critical patent/JPS5766533A/ja
Publication of JPH0219536B2 publication Critical patent/JPH0219536B2/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

Landscapes

  • Optical Recording Or Reproduction (AREA)
JP55141174A 1980-10-09 1980-10-09 Optical information reader Granted JPS5766533A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP55141174A JPS5766533A (en) 1980-10-09 1980-10-09 Optical information reader
US06/309,402 US4525825A (en) 1980-10-09 1981-10-07 Method and apparatus for detecting focussing and tracking error signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55141174A JPS5766533A (en) 1980-10-09 1980-10-09 Optical information reader

Publications (2)

Publication Number Publication Date
JPS5766533A JPS5766533A (en) 1982-04-22
JPH0219536B2 true JPH0219536B2 (US06818201-20041116-C00086.png) 1990-05-02

Family

ID=15285858

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55141174A Granted JPS5766533A (en) 1980-10-09 1980-10-09 Optical information reader

Country Status (2)

Country Link
US (1) US4525825A (US06818201-20041116-C00086.png)
JP (1) JPS5766533A (US06818201-20041116-C00086.png)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59191144A (ja) * 1983-04-14 1984-10-30 Sony Corp 光ピツクアツプのトラツキングサ−ボ回路
JPH0782655B2 (ja) * 1983-04-28 1995-09-06 オリンパス光学工業株式会社 光ヘッド
FR2597643A1 (fr) * 1985-11-08 1987-10-23 Seiko Epson Corp Systeme de lecture de signal magneto-optique
US5270996A (en) * 1986-12-25 1993-12-14 Nec Corporation Optical head with diffraction grating producing five diffracted detection light beams
JP2508761B2 (ja) * 1987-10-20 1996-06-19 日本電気株式会社 光記憶再生装置
JP2747332B2 (ja) * 1989-07-05 1998-05-06 三菱電機株式会社 光ヘッド
JP2716569B2 (ja) * 1990-04-25 1998-02-18 パイオニア株式会社 光学式情報読取り装置
US5101393A (en) * 1990-07-25 1992-03-31 Hewlett-Packard Company Optical position error detection using complementary steep angle reflections/transmissions
US5216562A (en) * 1990-09-25 1993-06-01 International Business Machines Corporation Multi-beam optical recording system and method
US5677903A (en) * 1991-03-25 1997-10-14 U.S. Phillips Corporation Multi-layer information storage system with improved aberration correction
US7786049B2 (en) * 2003-04-10 2010-08-31 Halliburton Energy Services, Inc. Drilling fluids with improved shale inhibition and methods of drilling in subterranean formations
US7087554B2 (en) * 2003-04-10 2006-08-08 Halliburton Energy Services, Inc. Drilling fluids with improved shale inhibition and methods of drilling in subterranean formations

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5499602A (en) * 1978-01-24 1979-08-06 Matsushita Electric Ind Co Ltd Reader of light transmission type information carrier

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US953002A (en) * 1908-02-17 1910-03-22 Rees Hook Company Machine for manufacturing lacing-hooks.
NL7413162A (nl) * 1974-10-07 1976-04-09 Philips Nv Inrichting voor het uitlezen van een schijf- vormige registratiedrager.
FR2323160A1 (fr) * 1975-09-03 1977-04-01 Thomson Brandt Dispositif optique de projection et lecteur optique comportant un tel dispositif
FR2325987A1 (fr) * 1975-09-29 1977-04-22 Thomson Brandt Dispositif de lecture optique d'un enregistrement
NL7600843A (nl) * 1976-01-28 1977-08-01 Philips Nv Inrichting voor het uitlezen van een registratie- drager waarop informatie, bijvoorbeeld en/of ge- luidsinformatie, is aangebracht.
GB1532345A (en) * 1976-06-25 1978-11-15 Hitachi Ltd Information play-back apparatus
NL7708200A (nl) * 1976-07-28 1978-01-31 Hitachi Ltd Automatische scherpstellingsinrichting.
JPS567246A (en) * 1979-06-25 1981-01-24 Olympus Optical Co Ltd Method and unit for focus detection
JPS5661044A (en) * 1979-10-25 1981-05-26 Olympus Optical Co Ltd Optical information reader
NL7907216A (nl) * 1979-09-28 1981-03-31 Philips Nv Optisch fokusfout-detektiestelsel.
FR2470391A1 (fr) * 1979-11-21 1981-05-29 Thomson Csf Dispositif optique stigmatique d'emission-reception de rayonnements coherents et tete optique d'enregistrement-lecture comprenant un tel dispositif

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5499602A (en) * 1978-01-24 1979-08-06 Matsushita Electric Ind Co Ltd Reader of light transmission type information carrier

Also Published As

Publication number Publication date
JPS5766533A (en) 1982-04-22
US4525825A (en) 1985-06-25

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