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Two accelerometers, a pressure sensor, and a ball-point pen ink cartridge are combined in a pen housing to form a convenient signature verification pen.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
63% of the total text.
Page 1 of 1
Pen for Signature Verification by Acceleration and Pressure
Two accelerometers, a pressure sensor, and a ball-point pen ink cartridge
are combined in a pen housing to form a convenient signature verification pen.
In one technique for signature verification, a person writes his or her
signature with a pen that carries an accelerometer and a pressure sensor. The
acceleration and pressure signals are sampled and digitized, and the profile of
these samples is compared with the profile of a previously prepared valid
signature. There is a high correlation between the acceleration and pressure
profiles of valid signatures and there is a poor correlation between the profiles of
a valid signature and a forged signature.
A conventional ball point pen cartridge is mounted between two springs to
move axially when the writer presses the cartridge tip against a writing surface in
the natural motion to write a signature. The springs are arranged to permit the
cartridge to move to an initial position with a minimum pressure. As the user
applies varying writing pressure to the pen, the cartridge moves variably beyond
the initial position. The cartridge carries one plate of a capacitor, and the
housing carries the other plate of the capacitor.
The pen carries a flexible cable that is connected to a control device. The
control device includes an oscillator that is connected by the cable in series with
the acceleration measuring capacitor and with a current sensing circuit. As the