Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – By medium defect indicative control signal
Reexamination Certificate
2008-08-15
2011-11-15
Pardo, Thuy (Department: 2627)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
By medium defect indicative control signal
C369S047410, C369S053170, C369S053240
Reexamination Certificate
active
08059504
ABSTRACT:
An optical pickup apparatus capable of irradiating an optical recording medium having a plurality of recording layers on which a signal is recorded with laser light includes a light source emitting the laser light, a light-concentrating element concentrating the laser light emitted from the light source on the optical recording medium, a phase difference element having a region divided into at least two regions which the laser light reflected by the optical recording medium enters and producing a phase difference between first light and second light reflected by a non-target layer which is not a target of recording or reproduction of the signal out of the plurality of recording layers and entering the at least two regions such that the first and the second light weaken each other, and a photodetector receiving the laser light emitted from the phase difference element.
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Office Action issued Aug. 23, 2011, in Japanese Patent Application No. 2007-253423.
Tsuboi Taku
Ueda Eiichi
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Pardo Thuy
Sony NEC Optiarc Inc.
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