Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2011-05-31
2011-05-31
Chow, Van N (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112100
Reexamination Certificate
active
07952977
ABSTRACT:
A diffracting portion is disposed in an optical path between a light source and an optical disc. The diffracting portion diffracts the reflected light from recording layers of the optical disc toward a light receiving portion. The diffracting portion includes a first diffraction region having a first diffraction efficiency and a second diffraction region having a second diffraction efficiency lower than the first diffraction efficiency. The first diffraction region includes a FES diffracting portion and first to fourth TES diffracting portions. The second diffraction region includes fifth and sixth TES diffracting portions. First-order diffraction lights from the non-light-collecting recording layer enter on the fifth and the sixth TES diffracting portions, and are diffracted toward the light receiving portion by the fifth and the sixth TES diffracting portions.
REFERENCES:
patent: 6654336 (2003-11-01), Kadowaki et al.
patent: 2006/0262695 (2006-11-01), Tsuchida et al.
patent: 2007/0025228 (2007-02-01), Matsubara et al.
patent: 2007/0053272 (2007-03-01), Watanabe et al.
patent: 1905023 (2007-01-01), None
patent: 2004-303296 (2004-10-01), None
patent: 2006-114151 (2006-04-01), None
patent: 2007-059031 (2007-03-01), None
Matsubara Kazunori
Murakami Shinzoh
Chow Van N
Morrison & Foerster / LLP
Sharp Kabushiki Kaisha
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