Optical scanning device

Details Optical scanning device Optical scanning device

2007-02-27

2007-02-27

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112070, C359S489040

Reexamination Certificate

active

10528677

ABSTRACT:
An optical scanning device for scanning an optical record carrier comprising an information layer. Crosstalk cancellation is provided using a phase modulating element (40, 140) for generating a non-rotationally-symmetric phase profile in a subsidiary radiation beam. The phase profile varies with an azimuthal angle measured about the optical axis of the beam portion, the phase profile varying such that successively different phases are introduced in at least five locations which are each at successive azimuthal angles (φ1, φ2, φN) and each at a given radial distance from the optical axis, wherein the phase profile is such that the phases introduced, when taken in modulo 2π form, successively cycle through 0 to 2π at least twice, whereby the subsidiary beam spot is provided with an intensity distribution on the information layer which overlaps that of the side-lobe of the main beam spot.

REFERENCES:
patent: 4531216 (1985-07-01), Tyler
patent: 6115345 (2000-09-01), Kato et al.
patent: 6185168 (2001-02-01), Kato et al.
patent: 6373808 (2002-04-01), Jeong

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