Optical scanning device

Details Optical scanning device Optical scanning device

2005-04-05

2005-04-05

Edun, Muhammad (Department: 2655)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112240, C369S044230

Reexamination Certificate

active

06876619

ABSTRACT:
An optical scanning device is adapted for scanning record carriers (13, 27) having transparent layers (14, 28) of different thicknesses through which a converging beam (12, 26) must pass. An objective lens (11) of the device is designed to form the converging beam (14) for scanning through a first transparent layer (14). When scanning through a second transparent layer (28), the objective lens is operated at different conjugate distances, resulting in a small field. The field is increased by introducing spherical aberration in the radiation beam (25) incident on the objective lens and compensating this spherical aberration in the objective lens.

REFERENCES:
patent: 5699341 (1997-12-01), Sugi et al.

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