GB2334811A - Optical disc reader - Google Patents

Optical disc reader

Info

Publication number
GB2334811A
GB2334811A GB9911096A GB9911096A GB2334811A GB 2334811 A GB2334811 A GB 2334811A GB 9911096 A GB9911096 A GB 9911096A GB 9911096 A GB9911096 A GB 9911096A GB 2334811 A GB2334811 A GB 2334811A
Authority
GB
United Kingdom
Prior art keywords
optical disc
disc
disc reader
light
coherent
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.)
Withdrawn
Application number
GB9911096A
Other versions
GB9911096D0 (en
Inventor
Touraj Moghaddam
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.)
VERITY GROUP PLC
Original Assignee
VERITY GROUP PLC
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 VERITY GROUP PLC filed Critical VERITY GROUP PLC
Publication of GB9911096D0 publication Critical patent/GB9911096D0/en
Publication of GB2334811A publication Critical patent/GB2334811A/en
Withdrawn legal-status Critical Current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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

An optical disc reader of the kind comprising a laser arranged to direct a coherent light beam towards a disc (3) to be read, and means detecting light reflected from the disc, characterised by a second light source (1) which is non-coherent and which is arranged to illuminate the disc with light of a colour different from that of the laser beam.
GB9911096A 1996-11-15 1997-11-13 Optical disc reader Withdrawn GB2334811A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9623766.4A GB9623766D0 (en) 1996-11-15 1996-11-15 Optical disc reader
PCT/GB1997/003123 WO1998022943A1 (en) 1996-11-15 1997-11-13 Optical disc reader

Publications (2)

Publication Number Publication Date
GB9911096D0 GB9911096D0 (en) 1999-07-14
GB2334811A true GB2334811A (en) 1999-09-01

Family

ID=10802977

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9623766.4A Pending GB9623766D0 (en) 1996-11-15 1996-11-15 Optical disc reader
GB9911096A Withdrawn GB2334811A (en) 1996-11-15 1997-11-13 Optical disc reader

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9623766.4A Pending GB9623766D0 (en) 1996-11-15 1996-11-15 Optical disc reader

Country Status (3)

Country Link
AU (1) AU4957897A (en)
GB (2) GB9623766D0 (en)
WO (1) WO1998022943A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5584909A (en) * 1978-12-20 1980-06-26 Ricoh Co Ltd Information reading system by laser beam
EP0384358A2 (en) * 1989-02-20 1990-08-29 Omron Corporation Optical recording and playback system of dual light source type
DE4018275A1 (en) * 1989-06-07 1990-12-20 Hitachi Ltd DEVICE AND METHOD FOR MAGNETIC RECORDING AND OPTICAL PLAYBACK WITH HIGH DENSITY
US5485441A (en) * 1993-10-01 1996-01-16 Pioneer Electronic Corporation Method of optically reading information, optical pickup apparatus and optical reproducing apparatus
WO1997021214A1 (en) * 1995-12-04 1997-06-12 Yves Bernard Andre Device for optically reading digital data from a medium, particularly a laser disk reader device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5584909A (en) * 1978-12-20 1980-06-26 Ricoh Co Ltd Information reading system by laser beam
EP0384358A2 (en) * 1989-02-20 1990-08-29 Omron Corporation Optical recording and playback system of dual light source type
DE4018275A1 (en) * 1989-06-07 1990-12-20 Hitachi Ltd DEVICE AND METHOD FOR MAGNETIC RECORDING AND OPTICAL PLAYBACK WITH HIGH DENSITY
US5485441A (en) * 1993-10-01 1996-01-16 Pioneer Electronic Corporation Method of optically reading information, optical pickup apparatus and optical reproducing apparatus
WO1997021214A1 (en) * 1995-12-04 1997-06-12 Yves Bernard Andre Device for optically reading digital data from a medium, particularly a laser disk reader device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Vol. 4, No. 134 (P-028) & JP550084909 *

Also Published As

Publication number Publication date
GB9911096D0 (en) 1999-07-14
WO1998022943A1 (en) 1998-05-28
AU4957897A (en) 1998-06-10
GB9623766D0 (en) 1997-01-08

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)