Appeal No. 94-3696
Application 07/995,230
piezoelectric effect material and connected with a common return
electrical node of said sensing apparatus;
electronic amplifier means, including a plurality
of high input impedance electronic amplifier circuits physically
disposed adjacent to said array of electrode elements with each
said amplifier circuit having respective input nodes connected
with one of said electrode elements and with said common return
electrical node for amplifying a piezoelectric effect electrical
charge signal received on said electrode element during sensed
tactile force physical deformations of said film of piezoelectric
effect material;
low voltage electrical charge generating means
temporarily connected with each said electrode element of said
array for pre-conditioning said piezoelectric effect material to
a substantially uniformed signal generation state prior to each
said tactile force physical deformation.
20. The method of tactile force sensing comprising the
steps of:
generating a spatial map related array of discrete
electrical signals each representing a force magnitude at a
predetermined planar location within an applied force field;
said signal generating step including capacitively
sensing local quantums of electrical charge displaced to surface
adjacent portions of a piezoelectric film by physical deformation
of said film from said applied force field;
each said signal generating step being preceded by
a temporary low voltage electrical signal induced output signal
range limiting physical preconditioning of said piezoelectric
film; and
amplifying each said discrete electrical signal of
said array in an amplifying location disposed adjacent said
3
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007