Focusing control method for label side of lightscribe discs

Details Focusing control method for label side of lightscribe discs Focusing control method for label side of lightscribe discs

2011-01-25

2011-01-25

Haley, Joseph (Department: 2627)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

Reexamination Certificate

active

07876347

ABSTRACT:
A focusing control method on a light-scribed disc firstly focuses a base voltage on a label side. Light summed signals are detected and recorded. The biggest light summed signal is determined, and subtracts the light summed signal of each spoke to form an error signal. The error signal is multiplied by a gain to form a gain signal. The base voltage adds the gain signal to form an upper referring voltage, and subtracts the gain signal to form a lower referring voltage. The label side is focused with the upper referring voltage and the lower referring voltage respectively. The light summed signals are detected and recorded, to determine the biggest light summed signal of each spoke. According to the corresponding voltage of the biggest light summed signals, a focusing control curve is approached to determine optimum parameters.

REFERENCES:
patent: 4374323 (1983-02-01), Winslow et al.
patent: 7084894 (2006-08-01), Van Brocklin et al.
patent: 7196715 (2007-03-01), Hanks
patent: 2007/0064085 (2007-03-01), Lipinski
patent: 2007/0188587 (2007-08-01), Kwasny et al.
patent: 2007/0247512 (2007-10-01), Hsu et al.

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