FR2248569B1 - - Google Patents

Info

Publication number
FR2248569B1
FR2248569B1 FR7435270A FR7435270A FR2248569B1 FR 2248569 B1 FR2248569 B1 FR 2248569B1 FR 7435270 A FR7435270 A FR 7435270A FR 7435270 A FR7435270 A FR 7435270A FR 2248569 B1 FR2248569 B1 FR 2248569B1
Authority
FR
France
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
FR7435270A
Other versions
FR2248569A1 (fr
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
Publication of FR2248569A1 publication Critical patent/FR2248569A1/fr
Application granted granted Critical
Publication of FR2248569B1 publication Critical patent/FR2248569B1/fr
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
    • G11B7/12—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
    • G11B7/08—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
    • G11B7/0901—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 track following only
    • G11B7/0903—Multi-beam tracking systems

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
FR7435270A 1973-10-20 1974-10-21 Expired FR2248569B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7314464A NL7314464A (nl) 1973-10-20 1973-10-20 Inrichting voor het optisch aftasten van een informa- tiespoor op een roterende informatiedrager.

Publications (2)

Publication Number Publication Date
FR2248569A1 FR2248569A1 (fr) 1975-05-16
FR2248569B1 true FR2248569B1 (fr) 1979-08-24

Family

ID=19819855

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7435270A Expired FR2248569B1 (fr) 1973-10-20 1974-10-21

Country Status (15)

Country Link
JP (1) JPS5068731A (fr)
AT (1) AT339390B (fr)
BE (1) BE821269A (fr)
BR (1) BR7408645D0 (fr)
CA (1) CA1040741A (fr)
CH (1) CH574151A5 (fr)
DE (1) DE2448792A1 (fr)
DK (1) DK545474A (fr)
ES (1) ES431129A1 (fr)
FR (1) FR2248569B1 (fr)
GB (1) GB1475179A (fr)
IT (1) IT1024629B (fr)
NL (1) NL7314464A (fr)
NO (1) NO743762L (fr)
SE (1) SE7413069L (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5270990A (en) * 1986-08-15 1993-12-14 Canon Kabushiki Kaisha Tracking error signal detecting apparatus using an electron beam and apparatus for effecting recording/reproduction of information by the utilization of a plurality of electron beams

Also Published As

Publication number Publication date
DE2448792A1 (de) 1975-05-28
CA1040741A (fr) 1978-10-17
CH574151A5 (fr) 1976-03-31
JPS5068731A (fr) 1975-06-09
BR7408645D0 (pt) 1975-08-05
ES431129A1 (es) 1976-11-01
AU7442874A (en) 1976-04-29
NO743762L (fr) 1975-05-20
DK545474A (fr) 1975-06-30
ATA835874A (de) 1977-02-15
SE7413069L (fr) 1975-04-21
AT339390B (de) 1977-10-10
FR2248569A1 (fr) 1975-05-16
GB1475179A (en) 1977-06-01
NL7314464A (nl) 1975-04-22
BE821269A (fr) 1975-04-18
IT1024629B (it) 1978-07-20

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Legal Events

Date Code Title Description
ST Notification of lapse