Scanning apparatus for fluorescent multi-layer storage

Details Scanning apparatus for fluorescent multi-layer storage Scanning apparatus for fluorescent multi-layer storage

2007-01-23

2007-01-23

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S118000, C369S112230, C369S094000

Reexamination Certificate

active

10526304

ABSTRACT:
The invention relates to a scanning apparatus for scanning information in an information carrier (16) comprising a plurality of layers for storing data on a material capable of generating an excited radiation when interacting with an exciting beam (13) produced by an exciting source (11). The scanning apparatus comprises an objective lens (15) for projecting the exciting beam in a layer of the carrier and collecting the excited radiation. The scanning apparatus also comprises a detector unit (19) for detecting the excited radiation collected on the objective lens. According to the invention, the exciting beam has a numerical aperture lower than the lens numerical aperture.

REFERENCES:
patent: 6009065 (1999-12-01), Glushko et al.
patent: 6992965 (2006-01-01), Glushko et al.
Kenneth Mason; Reduction of Optical Disk Noise by Collection of Scattered Light; Publication, Hampshire, GB; No. 321, 1991; p. 49.

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