 |
On measurement
points (those at the intersection of longitudinal
and latitudinal electrodes), pressure-sensitive
and conductive ink films slightly touch each
other under no load.
 Resistance
is a few m
under this condition. |
 |
|
Force applied on both sides
of the sensor sheet depresses the pressure-sensitive
and conductive ink.
Resistance
decreases inversely proportional to applied
force. |
|
| * |
Analogue
resistance values are digitally converted
via analogue-to-digital (AD) converter
circuit (8 bit/256 steps (from zero
to 255)) |
|
|
| [Example of Sensor
Outputs] |
 |
|
| Measurement range
is changeable by changing compositions of
pressure-sensitive and conductive ink. |
|
| The
sensor sheet is comprised of two resin
film sheets. On each sheet, longitudinal
and latitudinal electrodes are placed
at even intervals. Special ink is formed
into a film over the electrode. Adhesive
is applied on portions other than sensing
portions to attach two sheets together
where intersecting points of longitudinal
and latitudinal electrodes form separate
force detection points (sensor cells).
Electrical resistance of sensor cells
under no load is almost infinite, while
it decreases inversely proportional
to applied force. Each electrode reads
changes in electric resistance values
at lighting speed. Analogue electric
resistance data are converted into digital
data in 256 steps, and are then exported
to the computer. Digitally converted
outputs are nearly proportional to applied
pressure. Thus, the sensor sheet permits
real time measurement of pressure distributions
through relative comparison with digitalized
data. You can alter components of the
special ink to change measurement range.
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