Optical head device

Details Optical head device Optical head device

2011-07-26

2011-07-26

Dinh, Tan X (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112190, C369S013310

Reexamination Certificate

active

07986606

ABSTRACT:
An optical head device having a broadband phase plate of transforming at least three linearly polarized light beams having different wavelengths into circularly polarized light beams, is obtained.A broadband phase plate comprising two phase plates9A and9B laminated with e.g. an adhesive agent so that their optical axes are crossed, wherein provided that wavelengths of linearly polarized incident light beams are λ1, λ2and λ3(λ1<λ2<λ3), at least one or both of the two phase plates has such a phase difference characteristics that a ratioR(λ1)/R(λ3)and a ratioR(λ2)/R(λ3)between retardation values of the wavelengths are smaller than 1 andR(λ1)/R(λ3)is smaller thanR(λ2)/R(λ3), is integrated in the optical head device.

REFERENCES:
patent: 6565974 (2003-05-01), Uchiyama et al.
patent: 6580674 (2003-06-01), Nishiyama et al.
patent: 7050380 (2006-05-01), Hirai et al.
patent: 2002/0005925 (2002-01-01), Arakawa
patent: 10-68816 (1998-03-01), None
patent: 2001-004841 (2001-01-01), None
patent: 2001-101700 (2001-04-01), None
patent: 2002-156528 (2002-05-01), None
patent: 2003-098350 (2003-04-01), None
patent: 2003-329840 (2003-11-01), None
patent: 2004-158118 (2004-06-01), None

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