CA1100233A - Scanning light beam of changing size - Google Patents

Scanning light beam of changing size

Info

Publication number
CA1100233A
CA1100233A CA291,841A CA291841A CA1100233A CA 1100233 A CA1100233 A CA 1100233A CA 291841 A CA291841 A CA 291841A CA 1100233 A CA1100233 A CA 1100233A
Authority
CA
Canada
Prior art keywords
light beam
record medium
tracks
size
scanning
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
CA291,841A
Other languages
English (en)
French (fr)
Inventor
Hiroshi Ohki
Takashi Otobe
Chiaki Kojima
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Application granted granted Critical
Publication of CA1100233A publication Critical patent/CA1100233A/en
Expired 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
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G11B19/24—Arrangements for providing constant relative speed between record carrier and head
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
CA291,841A 1976-11-30 1977-11-28 Scanning light beam of changing size Expired CA1100233A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP14456376A JPS5369006A (en) 1976-11-30 1976-11-30 Reproducer of disc form signal recording media
JP144563/76 1976-11-30

Publications (1)

Publication Number Publication Date
CA1100233A true CA1100233A (en) 1981-04-28

Family

ID=15365147

Family Applications (1)

Application Number Title Priority Date Filing Date
CA291,841A Expired CA1100233A (en) 1976-11-30 1977-11-28 Scanning light beam of changing size

Country Status (7)

Country Link
US (1) US4157568A (2)
JP (1) JPS5369006A (2)
AT (1) AT378091B (2)
AU (1) AU509203B2 (2)
CA (1) CA1100233A (2)
FR (1) FR2393393A1 (2)
GB (1) GB1551022A (2)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7902363A (nl) * 1979-03-27 1980-09-30 Philips Nv Registratiedrager met een optisch uitleesbare informa- tiestruktuur.
AU575453B2 (en) * 1979-09-26 1988-07-28 Discovision Associates Mastering machine
JPS626580Y2 (2) * 1979-11-17 1987-02-16
JPS57186216A (en) * 1981-05-12 1982-11-16 Victor Co Of Japan Ltd Information recording medium reproducer
JPS57208639A (en) * 1981-06-18 1982-12-21 Toshiba Corp Recording method of disk
US4419750A (en) * 1981-07-13 1983-12-06 Eastman Kodak Company Constant track width optical disk recording
CA1244941A (en) * 1984-03-24 1988-11-15 Yoshihiro Tsukamura Optical disk player
US4686662A (en) * 1984-07-16 1987-08-11 Storage Technology Partners Ii Subaperture coarse tracking optical system for optical data storage devices
US4623784A (en) * 1984-12-20 1986-11-18 Drexler Technology Corporation Laser recording apparatus with off-center lens and error detection
JPS61174026U (2) * 1985-04-16 1986-10-29
JP2531942B2 (ja) * 1986-04-14 1996-09-04 ティアツク株式会社 光学式デイスク記録装置
JP2810035B2 (ja) * 1986-08-22 1998-10-15 株式会社日立製作所 光学的記録再生方法
JPS63157331A (ja) * 1986-12-20 1988-06-30 Toshiba Corp 情報記憶再生装置
EP0289004B1 (en) * 1987-04-28 1994-03-23 Sharp Kabushiki Kaisha Recording and reproducing apparatus
WO1992014245A1 (fr) * 1991-02-05 1992-08-20 Sony Corporation Procede de reproduction de signaux dans un support d'enregistrement optique
JPH06259799A (ja) * 1993-03-04 1994-09-16 Nikon Corp 光ディスクの再生方法及び再生装置
KR100433605B1 (ko) * 1995-01-31 2004-11-12 소니 가부시끼 가이샤 광학적기록매체재생장치
WO2004049319A1 (en) * 2002-11-27 2004-06-10 Nokia Corporation Read/write device for optical memory and method therefore
US7679029B2 (en) * 2005-10-28 2010-03-16 Cymer, Inc. Systems and methods to shape laser light as a line beam for interaction with a substrate having surface variations
JP5679175B2 (ja) * 2010-03-24 2015-03-04 株式会社リコー 光走査装置及び画像形成装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3423524A (en) * 1965-01-05 1969-01-21 Minnesota Mining & Mfg Recording system
DE1562038B2 (de) * 1968-02-13 1971-05-13 Telefunken Patentverwertungsgesell schaft mbH, 790OUIm System zur aufzeichnung und abtastung von bildsignalen und der bildwechselfrequenz entsprechenden impulsen unter ver wendung eines plattenfoermigen aufzeichnungstraegers
NL172111C (nl) * 1973-07-02 1983-07-01 Philips Nv Registratiedrager waarop informatie is vastgelegd in een optische struktuur en inrichting voor het inschrijven van een dergelijke registratiedrager.
US4118734A (en) * 1974-02-14 1978-10-03 U.S. Philips Corporation Optical videodisc with variable width tracks
US4038679A (en) * 1974-02-14 1977-07-26 U.S. Philips Corporation Apparatus for reading an optically recorded record carrier provided with periodic surface undulations and for deriving a focussing control signal from such surface undulations
NL7402078A (nl) * 1974-02-15 1975-08-19 Philips Nv Inrichting voor het uitlezen van een schijfvormige registratiedrager.
JPS5223902A (en) * 1975-08-18 1977-02-23 Matsushita Electric Ind Co Ltd Optical playback device

Also Published As

Publication number Publication date
FR2393393A1 (fr) 1978-12-29
ATA858277A (de) 1984-10-15
AT378091B (de) 1985-06-10
GB1551022A (en) 1979-08-22
JPS5369006A (en) 1978-06-20
AU3101077A (en) 1979-06-07
US4157568A (en) 1979-06-05
AU509203B2 (en) 1980-04-24
FR2393393B1 (2) 1984-12-21

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Legal Events

Date Code Title Description
MKEX Expiry