Apparatus for determining pen acceleration

Details Apparatus for determining pen acceleration Apparatus for determining pen acceleration

G - Physics

06

K

354/60

G06K 9/62 (2006.01) G01P 15/125 (2006.01) G06K 9/00 (2006.01) G06K 9/24 (2006.01) G07C 9/00 (2006.01)

Patent

CA 1155959

APPARATUS FOR DETERMINING PEN ACCELERATION Abstract of the Disclosure An apparatus for determining pen acceleration for use in a signature vertification system. Capacitive transducer means are mounted in a pen, and change capacitance by an amount which is proportional to pen acceleration. A Blumlein bridge circuit is utilized to measure changes in the capacitance of the transducer means, and the output of the bridge is amplified and demodulated to result in a signal which is proportional to acceleration. PY/pr

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