Read Sharp PN-L802B (serv.man3) Handy Guide online
PNL-802B
Principle of Touch Panel
11
1.
The CPU on the camera control PWB
instructs the camera units to emit IR LED
light at 90 degrees in shape. The LED on
the left camera emits light to the right side
and bottom, while the LED on the right
camera emits light on the left side and
bottom.
2.
When the LED light reaches the reflectors
at the right, left and bottom, it is reflected
at the same angle of incident. The line
sensor in the camera unit detects
reflected light in the range of 90 degrees.
When the screen is touched with a stylus
or finger, etc, the touched area is shielded
and no light is reflected from the area.
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