GB1501141A - Optically readable record carrier and apparatus for reading same - Google Patents

Optically readable record carrier and apparatus for reading same

Info

Publication number
GB1501141A
GB1501141A GB5302/75A GB530275A GB1501141A GB 1501141 A GB1501141 A GB 1501141A GB 5302/75 A GB5302/75 A GB 5302/75A GB 530275 A GB530275 A GB 530275A GB 1501141 A GB1501141 A GB 1501141A
Authority
GB
United Kingdom
Prior art keywords
grating
areas
track
tracks
type
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
GB5302/75A
Other languages
English (en)
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1501141A publication Critical patent/GB1501141A/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)
GB5302/75A 1974-02-12 1975-02-07 Optically readable record carrier and apparatus for reading same Expired GB1501141A (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
GB1501141A true GB1501141A (en) 1978-02-15

Family

ID=19820729

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5302/75A Expired GB1501141A (en) 1974-02-12 1975-02-07 Optically readable record carrier and apparatus for reading same

Country Status (16)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169123A (en) * 1984-12-20 1986-07-02 Drexler Tech Laser recording apparatus with off-centre lens
US5216649A (en) * 1988-06-20 1993-06-01 Mitsubishi Denki Kabushiki Kaisha Optical head with a tilt correction servo mechanism

Families Citing this family (7)

* 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

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 (ja) * 1968-07-15 1974-02-22 Ibm
JPS5117405B2 (ja) * 1972-05-15 1976-06-02

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2169123A (en) * 1984-12-20 1986-07-02 Drexler Tech Laser recording apparatus with off-centre lens
US5216649A (en) * 1988-06-20 1993-06-01 Mitsubishi Denki Kabushiki Kaisha Optical head with a tilt correction servo mechanism

Also Published As

Publication number Publication date
CA1047644A (en) 1979-01-30
JPS50119517A (ja) 1975-09-19
DK138567C (ja) 1979-03-05
AT338889B (de) 1977-09-26
SE7501407L (ja) 1975-08-13
SE410808B (sv) 1979-11-05
ZA75131B (en) 1976-08-25
BE825379A (fr) 1975-08-11
ES452770A1 (es) 1977-10-01
IT1031581B (it) 1979-05-10
DE2503975A1 (de) 1975-08-14
FR2260911B1 (ja) 1982-03-05
AU7802575A (en) 1976-08-12
CH592350A5 (ja) 1977-10-31
NO750416L (ja) 1975-08-13
NL7401858A (nl) 1975-08-14
FR2260911A1 (ja) 1975-09-05
ATA98275A (de) 1977-01-15
DK138567B (da) 1978-09-25
ES434588A1 (es) 1977-03-16
AU497709B2 (en) 1979-01-04
DK45475A (ja) 1975-10-06

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee