GB1428731A - Apparatus for reading records by optical means - Google Patents

Apparatus for reading records by optical means

Info

Publication number
GB1428731A
GB1428731A GB1445273A GB1445273A GB1428731A GB 1428731 A GB1428731 A GB 1428731A GB 1445273 A GB1445273 A GB 1445273A GB 1445273 A GB1445273 A GB 1445273A GB 1428731 A GB1428731 A GB 1428731A
Authority
GB
United Kingdom
Prior art keywords
detectors
information
focus
disc
track
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
GB1445273A
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 GB1428731A publication Critical patent/GB1428731A/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
    • G11B7/12—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
    • 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
    • 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
    • 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
    • G11B7/0916—Foucault or knife-edge methods
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/7605—Television signal recording on discs or drums

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
GB1445273A 1972-03-29 1973-03-26 Apparatus for reading records by optical means Expired GB1428731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NLAANVRAGE7204204,A NL171516C (nl) 1972-03-29 1972-03-29 Inrichting voor het langs optische weg uitlezen van een registratiedrager en plaatvormige registratiedrager bestemd om uitgelezen te worden met deze inrichting.

Publications (1)

Publication Number Publication Date
GB1428731A true GB1428731A (en) 1976-03-17

Family

ID=19815734

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1445273A Expired GB1428731A (en) 1972-03-29 1973-03-26 Apparatus for reading records by optical means

Country Status (14)

Country Link
JP (1) JPS5313122B2 (fr)
AT (1) AT328001B (fr)
BE (1) BE797398A (fr)
CA (1) CA1022676A (fr)
CH (1) CH562492A5 (fr)
DK (1) DK133212C (fr)
ES (1) ES413062A1 (fr)
FR (1) FR2178106B1 (fr)
GB (1) GB1428731A (fr)
IT (1) IT983615B (fr)
NL (1) NL171516C (fr)
NO (1) NO141389C (fr)
SE (1) SE388957B (fr)
ZA (1) ZA731525B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2280150B1 (fr) * 1974-07-26 1977-01-07 Thomson Brandt Dispositif de detection d'ecart de mise au point d'une tete de lecture optique par rapport a une surface de lecture
JPS5828656B2 (ja) * 1978-01-24 1983-06-17 松下電器産業株式会社 光透過型情報担体の読取り装置

Also Published As

Publication number Publication date
DK133212B (da) 1976-04-05
NL171516C (nl) 1983-04-05
AT328001B (de) 1976-02-25
DE2313741B2 (de) 1976-02-26
ZA731525B (en) 1974-10-30
FR2178106B1 (fr) 1978-09-08
AU5370873A (en) 1974-09-26
SE388957B (sv) 1976-10-18
IT983615B (it) 1974-11-11
ES413062A1 (es) 1976-06-16
JPS5313122B2 (fr) 1978-05-08
DK133212C (da) 1977-03-28
FR2178106A1 (fr) 1973-11-09
CH562492A5 (fr) 1975-05-30
NO141389B (no) 1979-11-19
NO141389C (no) 1980-02-27
JPS4910057A (fr) 1974-01-29
DE2313741A1 (de) 1973-10-11
BE797398A (fr) 1973-09-27
CA1022676A (fr) 1977-12-13
NL7204204A (fr) 1973-10-02
ATA263273A (de) 1975-05-15
NL171516B (nl) 1982-11-01

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee