Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2011-06-28
2011-06-28
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
07969851
ABSTRACT:
A laser converging apparatus comprising: a nonpolarizing 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 diffracting laser light into zero order light and high-order diffracted light having the order of primary or higher; an objective lens having the numerical aperture corresponding to the thickness of the first protective layer, the objective lens converging the laser light having passed through a part of the first area other than the second area and the zero order light having passed through the second area onto an information surface on one side of the first protective layer, the objective lens converging the high-order diffracted 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 nonpolarizing hologram element and the objective lens.
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Chow Van N
Fish & Richardson P.C.
Sanyo Electric Co,. Ltd.
SANYO Optec Design Co., Ltd.
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