Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-09-20
2005-09-20
Miller, Brian E. (Department: 2652)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S053190, C369S044410
Reexamination Certificate
active
06947360
ABSTRACT:
A tilt detecting apparatus of an information-recording medium having a photo diode for detecting a light reflected from an information-recording medium and outputting a light amount signal according to the detected light amount; and a calculating unit for calculating a radial tilt amount by using the light amount signal, wherein the photodiode is divided into a plurality of cells which are identified as regions according to a light amount of the reflected light, based on which a tilt signal is detected. A portion of the reflected light diffracted at the information-recording medium is detected by using the 8-divided photo diode, the region having a large difference in a light amount by the tilt and the region having a small difference in a light amount by the tilt in view of the characteristic of the reflected light are detected. And then, after push-pull values of each region are computed to remove an influence of the radial shift by using the two push-pull values, a corresponding difference between the tilt amounts, thereby obtaining an accurate tilt direction and degree of the information-recording medium.
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Agustin Peter Vincent
Birch & Stewart Kolasch & Birch, LLP
LG Electronics Inc.
Miller Brian E.
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