Device for optically scanning record carriers of different thick

Details Device for optically scanning record carriers of different thick Device for optically scanning record carriers of different thick

1997-03-06

1999-07-20

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369112, 369118, G11B 700

Patent

active

059264500

ABSTRACT:
An optical scanning device can scan two types of record carriers each having a transparent layer with a different thickness, in which a focused radiation beam scans an information layer of the record carrier through the transparent layer. When scanning a first type of record carrier the best focus of the radiation beam is positioned on the information layer and when scanning a second type of record carrier the paraxial focus of the radiation beam is positioned on the information layer. The lens system focusing the radiation beam comprises an opaque ring between a transparent central area and a transparent annular area.

REFERENCES:
patent: 4358200 (1982-11-01), Keemskerk et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5665957 (1997-09-01), Lee et al.
patent: 5708638 (1998-01-01), Braat et al.

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