Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2009-03-04
2011-11-22
Feild, Joseph (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112120, C369S044230, C369S112030, C369S044420
Reexamination Certificate
active
08064317
ABSTRACT:
An optical pickup apparatus is provided with: an astigmatic element for introducing astigmatism to a reflected light from a recording medium; and an optical element for varying advancing directions of luminous fluxes within four different luminous flux regions with one another, out of the reflected light, so as to scatter the luminous fluxes within the four luminous flux regions with one another. When an intersecting point of two mutually crossing straight lines respectively parallel to a first direction by the astigmatic element and a second direction vertical to the first convergence direction is aligned to an optical axis of the reflected light, the two luminous flux regions are placed in a direction where a set of vertical angles created by the two straight lines forms a line, and the remaining two luminous flux regions are placed in a direction where the other set of vertical angles forms a line.
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Explanation of Circumstances filed in the corresponding Japanese Application No. 2008-054147, filed Jun. 3, 2010, pp. 1-11, Japan.
Japanese Office Action for corresponding JP Application No. 2008-054147, dated Jul. 6, 2010, pp. 1-7 Japan.
Ditthavong Mori & Steiner, P.C.
Feild Joseph
Gupta Parul
Sanyo Electric Co,. Ltd.
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