Diffraction element and optical head device equipped therewith

Details Diffraction element and optical head device equipped therewith Diffraction element and optical head device equipped therewith

2009-04-10

2011-10-18

Psitos, Aristotelis (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

08040778

ABSTRACT:
A grating portion has a plurality of convex portions provided on at least one principal plane of a transparent substrate having a first layer containing a first transparent material and a second layer containing a second transparent material, and extended in parallel to each other in a first direction as well as periodically arranged in a second direction orthogonal to the first direction. A filling portion fills a third layer containing a third transparent material at least between the plurality of convex portions. Assuming that the change rate of the refractive index with the change of temperature of the first transparent material is αA, the change rate of the refractive index with the change of temperature of the second transparent material is αB, and the change rate of the refractive index with the change of temperature of the third transparent material is αC, the relationship αA<αC<0 and |αC|>|αB| is satisfied.

REFERENCES:
patent: 6545808 (2003-04-01), Ehbets et al.
patent: 6891147 (2005-05-01), Goto et al.
patent: 7142363 (2006-11-01), Sato et al.
patent: 7379241 (2008-05-01), Smith
patent: 7755834 (2010-07-01), Koyanagi et al.
patent: 2005/0249447 (2005-11-01), Momoki et al.
patent: 2006/0033913 (2006-02-01), Sato et al.
patent: 2006/0057707 (2006-03-01), Cunningham et al.
patent: 2006/0152809 (2006-07-01), Smith
patent: 2008/0030632 (2008-02-01), Murata
patent: 2008/0316600 (2008-12-01), Koyanagi et al.
patent: 1 596 226 (2005-11-01), None
patent: 1 783 520 (2007-05-01), None
patent: 11044810 (A) (1999-02-01), None
patent: 11295524 (A) (1999-10-01), None
patent: 2004-341471 (2004-12-01), None
patent: 2004342295 (A) (2004-12-01), None
patent: 2006073042 (A) (2006-03-01), None
MAT (machine assisted translation) of JP 2004-341471.

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