Disc apparatus and a method for activating a focusing servo

Details Disc apparatus and a method for activating a focusing servo Disc apparatus and a method for activating a focusing servo

2005-09-06

2005-09-06

Drula, Brian F. (Department: 2652)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044270, C369S044250

Reexamination Certificate

active

06940788

ABSTRACT:
According to the method, the focusing servo is activated at the zero-crossing point of a focusing error signal FE immediately after the focusing error signal FE has exceeded the first threshold th1or has dropped below the second threshold th2.The absolute value of the first threshold th1and the second threshold th2is reduced each time a predetermined time t is elapsed until the focusing servo is activated.

REFERENCES:
patent: 5642340 (1997-06-01), Nomura
patent: 6243341 (2001-06-01), Hasimoto
patent: 6278672 (2001-08-01), Kobayashi
patent: 6545956 (2003-04-01), Shimamura et al.
patent: 6744705 (2004-06-01), Sumida et al.
patent: 3-156731 (1991-07-01), None
patent: 05-334688 (1993-12-01), None

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