Device for optically scanning a recording medium by focusing the

Details Device for optically scanning a recording medium by focusing the Device for optically scanning a recording medium by focusing the

1996-03-14

1998-01-13

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 58, G11B 700

Patent

active

057086389

ABSTRACT:
An optical scanning device can scan two types of record carriers each having a transparent layer with a different thickness, in which a 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 a scanning 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.

REFERENCES:
patent: 4023033 (1977-05-01), Bricot et al.
patent: 4724533 (1988-02-01), Ohara et al.
patent: 5446565 (1995-08-01), Komma et al.

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