Optimizing focus point for optical disc

Details Optimizing focus point for optical disc Optimizing focus point for optical disc

2006-06-09

2009-12-15

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

Reexamination Certificate

active

07633840

ABSTRACT:
An apparatus comprising a focus controller, a photo-diode sensor, a data circuit, a focus error creation circuit and a focus offset circuit. The focus controller may be configured to control a lens in relation to a laser beam and allow the laser beam to focus on a disc. The photo-diode sensor may be configured to generate one or more photo-diode signals in response to the laser beam. The data circuit may be configured to generate one or more disc status signals in response to the one or more photo-diode signals. The focus error creation circuit may generate a focus error signal. The focus error signal may provide a first value based on a focus point of the laser beam. The focus offset circuit may be configured to offset the first value of the focus error signal to a second value in response to the disc status signals to allow the focus controller to move the lens to a position which will increase the focus point of the laser beam on the disc.

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patent: 2003/0063534 (2003-04-01), Takeda
patent: 2004/0145978 (2004-07-01), Yamamoto
patent: 2005/0180276 (2005-08-01), Watanabe et al.
patent: 2006/0203631 (2006-09-01), Wu et al.

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