Device for reading and/or writing information from/onto an...

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

Reexamination Certificate

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Details

C369S044340, C369S053280

Reexamination Certificate

active

07120094

ABSTRACT:
A device for reading and/or writing information from an optical carrier, the device comprising an imager for imaging a radiation beam into scanning spot to scan the carrier, and a detector for generating a read signal indicative of the intensity of the radiation reflected from the carrier. The device has an information transfer mode, wherein the scanning spot is moved in a first direction. The device has a displacement mode, wherein the scanning spot is moved in a second direction transverse to the first direction. The device includes a controller for controlling the imager in response to a measurement signal indicative of the degree of focusing of the radiation beam. The controller samples and holds the measurement signal in response to a sample signal causing the measurement signal to be sampled when the intensity is comparatively high thus reducing radial-to-vertical crosstalk.

REFERENCES:
patent: 4561082 (1985-12-01), Gerard et al.
patent: 4813031 (1989-03-01), Bierhoff
patent: 5228019 (1993-07-01), Yanagi
patent: 5245598 (1993-09-01), Burroughs
patent: 5636197 (1997-06-01), Tateishi
patent: 5856959 (1999-01-01), Yanagisawa
patent: 09320070 (1997-12-01), None

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