Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-06-29
2010-06-22
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
C369S112170
Reexamination Certificate
active
07742382
ABSTRACT:
A laser converging apparatus is disclosed that comprises a polarizing hologram element having a first area defined by a numerical aperture corresponding to a thickness of a first protective layer of a first disk medium and a second area inside the first area, the second area defined by a numerical aperture corresponding to a thickness of a second protective layer (> the thickness of the first protective layer) of a second disk medium, the second area having a hologram pattern for transmitting first laser light linearly polarized in a first direction without diffracting the first laser light while diffracting and transmitting second laser light that is linearly polarized in a second direction crossing the first direction at right angles, the second laser light having the same wavelength as the first laser light; an objective lens having the numerical aperture corresponding to the thickness of the first protective layer, the objective lens converging the first laser light having passed through the first area including the second area onto an information surface on one side of the first protective layer, the objective lens converging the second laser light having passed through the second area onto an information surface on one side of the second protective layer; and a holder that holds the polarizing hologram element and the objective lens.
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Haruki Tokumaru, Fumihiko Yokow, Mitsuru Irie, “Zukai DVD Tokuhon” Textbook, p. 115, Ohmsha, Dec. 2003.
Japanese Office Action for Application No. 2005-194311 dated Mar. 16, 2010, 5 pages.
Chow Van N
Fish & Richardson P.C.
Sanyo Electric Co,. Ltd.
Sanyo Optec Design Co., Ltd.
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