Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-01-30
2007-01-30
Patel, Gautman R. (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
Reexamination Certificate
active
10761441
ABSTRACT:
The present invention relates to an apparatus for reading from and/or writing to optical recording media, which has a tracking device, a four-quadrant detector, two summation points and a phase comparator for tracking in accordance with the differential phase detection method, and also various delay elements that can be set by a control device. The object of the present invention is to propose an apparatus of this type which exhibits the best possible compensation of the error in the track error signal and thus in the tracking signal, the said error being caused on account of the lens movement. To that end, the invention provides for analogue delay elements to be arranged upstream and digital delay elements to be arranged downstream of the summation points. The present invention is suitable for apparatuses for reading from and/or writing to optical recording media, such as CD, CDI, CD-ROM, DVD, CDR and others.
REFERENCES:
patent: 3659229 (1972-04-01), Milton
patent: 4785441 (1988-11-01), Tanaka et al.
patent: 6266305 (2001-07-01), Buchler
Büchler Christian
Lehr Steffen
Fried Harvey D.
Laks Joseph J.
Patel Gautman R.
Thomson Licensing
Verlangieri Patricia
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