Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2005-10-04
2005-10-04
Neyzari, Ali (Department: 2655)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112080, C369S112260
Reexamination Certificate
active
06952390
ABSTRACT:
This invention is directed to an optical pickup apparatus, condensing optical system, and optical element which can at least reproduce and/or record information from/on a first optical information recording medium having a protective substrate thickness t1by using a light beam of a first wavelength λ1emitted from a first light source, and reproduce and/or record information from/on a second optical information recording medium having a protective substrate thickness t2(t2≧t1) by using a light beam of a second wavelength λ2(λ2>λ1) emitted from a second light source. The optical pickup apparatus of the invention includes a first phase modulator which gives a diffraction effect to only the light beam of the wavelength λ1on at least one optical surface, of a plurality of optical surfaces of a plurality of optical elements arranged on a common optical path through which the light beam of the first wavelength λ1and the light beam of the second wavelength λ2pass, and a second phase modulator which gives a diffraction effect to only the light beam of the wavelength λ2on at least one of the remaining optical surfaces. Each of the first phase modulator and second phase modulator has staircase-like discontinuous parts, each formed from a predetermined number of stepped portions, formed concentrically around an optical axis at the pitch defined by an optical path difference function.
REFERENCES:
patent: 6556534 (2003-04-01), Shimozono
patent: 6667943 (2003-12-01), Maruyama et al.
patent: 6807139 (2004-10-01), Sakamoto
patent: 2001-147367 (2001-05-01), None
patent: 2002-277732 (2002-09-01), None
Cohen & Pontani, Lieberman & Pavane
Konica Minolta Opto Inc.
Neyzari Ali
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