Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2004-01-16
2010-06-08
Edun, Muhammad N. (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044250, C369S044350, C369S124010
Reexamination Certificate
active
07733747
ABSTRACT:
An information recording and/or reproducing apparatus using a removable disk-shaped optical recording medium (51) is provided which includes a storage unit (31) to store an axial-runout amount in a predetermined radial position on the disk-shaped optical recording medium (51) being rotated, a near-field light projector (7) provided to condense a light beam emitted from a light source (3) and which projects the condensed light beam as near-field light when located in a field near the information recording surface of the disk-shaped optical recording medium (51), a first controller (30) which multiplies an axial-runout amount read from the storage unit (31) by a predetermined gain to generate a control signal and controls the near-field light projector (7) to follow the axial-runout amount of the disk-shaped optical recording medium (51), and a second controller (40) to control the near-field light projector (7) on the basis of the linear characteristic of the return-light amount of the near-field light to keep a predetermined distance in the near field from the information recording surface.
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Edun Muhammad N.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sony Corporation
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