Title:
OPTICAL SCANNING DEVICE
Document Type and Number:
WIPO Patent Application WO2002041303
Kind Code:
A3
Abstract:
The present invention provides a scanning device with the following features:the system is capable of writing data to record carriers of a first format because it is corrected for chromatic aberration resulting from fast wavelength variations during write operation; it has a diffractive element with a generally sawtooth-like pattern, such that it may for example be manufactured in a single-step replication process; the system has high efficiency for scanning first optical record carriers (e.g. DVDs) and acceptable efficiency for scanning second optical record carriers (e.g. CDs); and the lens provides limited spherochromatism and the system is thus able to cope with wavelength variations.
Inventors:
HENDRIKS BERNARDUS H W (NL)
WALS JEROEN (NL)
WALS JEROEN (NL)
Application Number:
PCT/EP2001/013045
Publication Date:
September 06, 2002
Filing Date:
November 08, 2001
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
HENDRIKS BERNARDUS H W (NL)
WALS JEROEN (NL)
HENDRIKS BERNARDUS H W (NL)
WALS JEROEN (NL)
International Classes:
G11B7/1374; G02B13/00; G11B7/135; G11B7/1353; G11B7/24079; G11B7/24085; G11B7/00; (IPC1-7): G11B7/135; G11B7/125
Domestic Patent References:
| WO1999057720A1 | 1999-11-11 |
Foreign References:
| EP1022731A2 | 2000-07-26 |
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