Method for determining size of optical disc inserted into...

Details Method for determining size of optical disc inserted into... Method for determining size of optical disc inserted into...

2007-11-30

2010-02-23

Nguyen, Vincent Q (Department: 2831)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

C324S710000, C369S053230, C720S695000

Reexamination Certificate

active

07667451

ABSTRACT:
A method of determining a size of an optical disc inserted into an optical disc drive is disclosed. The method includes driving a turntable motor of the optical disc drive to rotate the optical disc at a predetermined rotation frequency for reading data stored on the optical disc, measuring a rotation frequency of the turntable motor, applying a kick-pulse voltage to the turntable motor of the optical disc drive for a predetermined period of time, measuring a change in the rotation frequency of the turntable motor after applying the kick-pulse voltage, comparing the change in the rotation frequency of the turntable motor to a threshold value, and determining that the optical disc is an 8 cm disc when the change in the rotation frequency of the turntable motor is above the threshold value.

REFERENCES:
patent: 2003/0099167 (2003-05-01), Lee
patent: 2004/0076098 (2004-04-01), Choi

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