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US 4,078,226 AGranted
Input apparatus for dynamic signature verification systems
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsErrol P. EerNisse, Cecil E. Land, Jay B. Snelling
Life of this patent
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Abstract
The disclosure relates to signature verification input apparatus comprising a writing instrument and platen containing piezoelectric transducers which generate signals in response to writing pressures.
Claims13
A writing instrument for producing at least two output signals each of which is representative of a different directional component of an individual's handwriting action for signature verification, comprising:
- a flexible shaft having a longitudinal axis for holding an inscribing tip to be applied by a writer using said instrument to a writing surface, a first piezoelectric element fixedly secured to and extending along a portion of said shaft for bending concomitant with flexing of said shaft and thereby generating a first electric output signal representative of a first handwriting directional component in response to flexure in said shaft in a first direction, a second piezoelectric element fixedly secured to and extending along a portion of said shaft at a location circumferentially spaced from said first element for bending concomitant with flexing of said shaft and thereby generating a second electric output signal representative of a second handwriting directional component in response to flexure in said shaft in a second direction;
- and means for discretely conducting said first and second generated electric output signals representative of said first and second handwriting directional components, devoid of summing, from said first and second piezoelectric elements to an output device.
Apparatus for producing output signals representative of three dimensions of handwriting forces comprising:
- a writing instrument for hand holding comprising a plurality of piezoelectric elements which, in response to forces in two degrees of freedom exerted on said instrument by its use during handwriting, produce two separate electrical output signals representative of said forces in two degrees of freedom, a platen supported by a plurality of spaced apart piezoelectric elements which produce an electrical output signal representative of handwriting pressure on said platen, and means for discretely conducting said electrical output signals to a signal processing device.
Dependencies are inferred from the claim text.