Optical disk device

Details Optical disk device Optical disk device

2006-10-24

2006-10-24

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S121000

Reexamination Certificate

active

07126904

ABSTRACT:
A first light ray with a wavelength λ1 emanating from the first emission light source passes through the transparent substrate and is condensed by the objective lens on a signal surface of a first optical disk with a substrate thickness t1,a second light ray with a wavelength λ2 (≠λ1) emanating from the second emission light source passes through the transparent substrate and is condensed by the objective lens on a signal surface of a second optical disk with a substrate thickness t2,a step structure of at least one step is formed along a circle or an ellipse on a surface of the transparent substrate, andand by the step of the step structure, a phase of the first light ray is shifted by 2πn1+Δ1 and a phase of the second light ray is shifted by 2πn2+Δ2.

REFERENCES:
patent: 6201780 (2001-03-01), Katayama
patent: 6717906 (2004-04-01), Shimano
patent: 2001/0000310 (2001-04-01), Yoo et al.
patent: 2002/0181366 (2002-12-01), Katayama
patent: 0 881 634 (1998-12-01), None
patent: 10-334504 (1998-12-01), None

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