CA1047644A - Record carrier on which information is stored in an optically readable structure - Google Patents

Record carrier on which information is stored in an optically readable structure

Info

Publication number
CA1047644A
CA1047644A CA219,532A CA219532A CA1047644A CA 1047644 A CA1047644 A CA 1047644A CA 219532 A CA219532 A CA 219532A CA 1047644 A CA1047644 A CA 1047644A
Authority
CA
Canada
Prior art keywords
record carrier
areas
track
tracks
gratings
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
CA219,532A
Other languages
English (en)
French (fr)
Inventor
Hendrik De Lang
Gijsbertus Bouwhuis
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of CA1047644A publication Critical patent/CA1047644A/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
    • G11B7/004—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
    • G11B7/08—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
    • G11B7/0938—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 servo format, e.g. guide tracks, pilot signals
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
CA219,532A 1974-02-12 1975-02-06 Record carrier on which information is stored in an optically readable structure Expired CA1047644A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7401858A NL7401858A (nl) 1974-02-12 1974-02-12 Registratiedrager waarop informatie is aange- t in een optisch uitleesbare struktuur.

Publications (1)

Publication Number Publication Date
CA1047644A true CA1047644A (en) 1979-01-30

Family

ID=19820729

Family Applications (1)

Application Number Title Priority Date Filing Date
CA219,532A Expired CA1047644A (en) 1974-02-12 1975-02-06 Record carrier on which information is stored in an optically readable structure

Country Status (16)

Country Link
JP (1) JPS50119517A (es)
AT (1) AT338889B (es)
AU (1) AU497709B2 (es)
BE (1) BE825379A (es)
CA (1) CA1047644A (es)
CH (1) CH592350A5 (es)
DE (1) DE2503975A1 (es)
DK (1) DK138567B (es)
ES (2) ES434588A1 (es)
FR (1) FR2260911B1 (es)
GB (1) GB1501141A (es)
IT (1) IT1031581B (es)
NL (1) NL7401858A (es)
NO (1) NO750416L (es)
SE (1) SE410808B (es)
ZA (1) ZA75131B (es)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7510035A (nl) * 1975-08-26 1977-03-01 Philips Nv Registratiedrager met een optisch uitleesbare, langs sporen gerangschikte, informatiestruktuur en inrichting voor het uitlezen daarvan.
JPS5363002A (en) * 1976-11-18 1978-06-06 Sony Corp Signal recording system and disk type medium for recording signal
US4161752A (en) * 1977-06-28 1979-07-17 International Business Machines Corporation High density video disk having two pit depths
NL7803517A (nl) * 1978-04-03 1979-10-05 Philips Nv Registratiedrager met een optisch uitleesbare fase- struktuur en inrichting voor het uitlezen.
JPS57103132A (en) * 1980-12-16 1982-06-26 Matsushita Electric Ind Co Ltd Recording information carrier and its recorder and reproducer
NL8100098A (nl) * 1981-01-12 1982-08-02 Philips Nv Registratiedrager met optisch uitleesbare informatiestruktuur.
GB8309447D0 (en) * 1983-04-07 1983-05-11 Combined Tech Corp Plc Optical data storage
US4623784A (en) * 1984-12-20 1986-11-18 Drexler Technology Corporation Laser recording apparatus with off-center lens and error detection
DE68923833T2 (de) * 1988-06-20 1996-06-13 Mitsubishi Electric Corp Optischer Kopf mit Kippkorrekturservomechanismus.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314052A (en) * 1963-04-12 1967-04-11 Ibm Light modulation system
FR2014594B1 (es) * 1968-07-15 1974-02-22 Ibm
JPS5117405B2 (es) * 1972-05-15 1976-06-02

Also Published As

Publication number Publication date
DE2503975A1 (de) 1975-08-14
FR2260911A1 (es) 1975-09-05
DK138567C (es) 1979-03-05
SE7501407L (es) 1975-08-13
DK45475A (es) 1975-10-06
JPS50119517A (es) 1975-09-19
DK138567B (da) 1978-09-25
SE410808B (sv) 1979-11-05
AT338889B (de) 1977-09-26
ZA75131B (en) 1976-08-25
ES434588A1 (es) 1977-03-16
NL7401858A (nl) 1975-08-14
ATA98275A (de) 1977-01-15
AU497709B2 (en) 1979-01-04
GB1501141A (en) 1978-02-15
CH592350A5 (es) 1977-10-31
IT1031581B (it) 1979-05-10
FR2260911B1 (es) 1982-03-05
AU7802575A (en) 1976-08-12
BE825379A (fr) 1975-08-11
ES452770A1 (es) 1977-10-01
NO750416L (es) 1975-08-13

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