Title:
OPTICAL READING APPARATUS AND METHOD OF READING DATA
Document Type and Number:
WIPO Patent Application WO2004068177
Kind Code:
A3
Abstract:
This apparatus having an optical head (15-fig.1)) for reading data stored in an optical carrier (1) comprises: a light source constituted by a first laser (50) or master laser for illuminating said carrier, an optical mounting (58) for directing the reflected light from said carrier to a detection branch (65) in which a non-linear optical element (80) is placed. This non-linear optical element (80) improves the signal to noise ratio by its non-linear characteristic before detection by the usual detector (75). The invention can be used for DVD players and/or recorders.
Inventors:
ANDERSEN OLE KLEMBT (NL)
LIEDENBAUM COEN THEODORUS HUBE (NL)
HENDRIKS ROBERT FRANS MARIA (NL)
T HOOFT GERT WIM (NL)
LIEDENBAUM COEN THEODORUS HUBE (NL)
HENDRIKS ROBERT FRANS MARIA (NL)
T HOOFT GERT WIM (NL)
Application Number:
PCT/IB2004/000186
Publication Date:
September 16, 2004
Filing Date:
January 21, 2004
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
ANDERSEN OLE KLEMBT (NL)
LIEDENBAUM COEN THEODORUS HUBE (NL)
HENDRIKS ROBERT FRANS MARIA (NL)
T HOOFT GERT WIM (NL)
ANDERSEN OLE KLEMBT (NL)
LIEDENBAUM COEN THEODORUS HUBE (NL)
HENDRIKS ROBERT FRANS MARIA (NL)
T HOOFT GERT WIM (NL)
International Classes:
G11B7/005; G11B7/13; (IPC1-7): G11B7/005
Foreign References:
| US5889278A | 1999-03-30 | |||
| US6314122B1 | 2001-11-06 | |||
| US4562569A | 1985-12-31 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 018, no. 417 (P - 1781) 4 August 1994 (1994-08-04)
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 26 1 July 2002 (2002-07-01)
PATENT ABSTRACTS OF JAPAN vol. 014, no. 345 (P - 1083) 26 July 1990 (1990-07-26)
GEORGE PAN Z ET AL: "OPTICAL INJECTION INDUCED POLARIZATION BISTABILITY IN VERTICAL-CAVITY SURFACE-EMITTING LASERS", APPLIED PHYSICS LETTERS, AMERICAN INSTITUTE OF PHYSICS. NEW YORK, US, vol. 63, no. 22, 29 November 1993 (1993-11-29), pages 2999 - 3001, XP000414956, ISSN: 0003-6951
MORI Y ET AL: "HIGH SWITCHING-SPEED OPTICAL RS FLIP-FLOP CONSTRUCTED OF A TM-WAVE INJECTED SEMICONDUCTOR LASER", INTERNATIONAL ELECTRON DEVICES MEETING. LOS ANGELES, DEC. 7 - 10, 1986, NEW YORK, IEEE, US, 7 December 1986 (1986-12-07), pages 610 - 613, XP000042851
SAPIA A ET AL: "POLARIZATION SWITCHING IN SEMICONDUCTOR LASERS DRIVEN VIA INJECTIONFROM AN EXTERNAL RADIATION", APPLIED PHYSICS LETTERS, AMERICAN INSTITUTE OF PHYSICS. NEW YORK, US, vol. 50, no. 2, 12 January 1987 (1987-01-12), pages 57 - 59, XP000706839, ISSN: 0003-6951
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 26 1 July 2002 (2002-07-01)
PATENT ABSTRACTS OF JAPAN vol. 014, no. 345 (P - 1083) 26 July 1990 (1990-07-26)
GEORGE PAN Z ET AL: "OPTICAL INJECTION INDUCED POLARIZATION BISTABILITY IN VERTICAL-CAVITY SURFACE-EMITTING LASERS", APPLIED PHYSICS LETTERS, AMERICAN INSTITUTE OF PHYSICS. NEW YORK, US, vol. 63, no. 22, 29 November 1993 (1993-11-29), pages 2999 - 3001, XP000414956, ISSN: 0003-6951
MORI Y ET AL: "HIGH SWITCHING-SPEED OPTICAL RS FLIP-FLOP CONSTRUCTED OF A TM-WAVE INJECTED SEMICONDUCTOR LASER", INTERNATIONAL ELECTRON DEVICES MEETING. LOS ANGELES, DEC. 7 - 10, 1986, NEW YORK, IEEE, US, 7 December 1986 (1986-12-07), pages 610 - 613, XP000042851
SAPIA A ET AL: "POLARIZATION SWITCHING IN SEMICONDUCTOR LASERS DRIVEN VIA INJECTIONFROM AN EXTERNAL RADIATION", APPLIED PHYSICS LETTERS, AMERICAN INSTITUTE OF PHYSICS. NEW YORK, US, vol. 50, no. 2, 12 January 1987 (1987-01-12), pages 57 - 59, XP000706839, ISSN: 0003-6951
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