Coded data generation or conversion – Bodily actuated code generator – Including keyboard or keypad
Patent
1988-11-18
1990-01-09
Oberley, Alvin
Coded data generation or conversion
Bodily actuated code generator
Including keyboard or keypad
250221, 178170, 340712, G01V 904
Patent
active
048931209
ABSTRACT:
A touch panel system using modulated light beams to enable the system to detect when one or more of the light beams are blocked even in bright ambient light conditions. The system has a "touch sensitive" display surface with a defined perimeter. Surrounding the display surface are a multiplicity of light emitting elements and light receiving elements. These elements are located so that the light paths defined by selected pairs of light emitting and light receiving elements cross the display surface and define a grid of intersecting light paths. A scanning circuit sequentially enables selected pairs of the light emitting and light receiving elements, modulating the amplitude of the light emitted in accordance with a predetermined pattern. A filter generates a blocked path signal if the currently enabled light receiving element is not generating an output signal modulated in accordance with the predetermined pattern. Finally a computer is used to determine if an object is adjacent to the display surface and the location of the object, by determining if the filter is generating at least two blocked path signals corresponding to light paths which intersect each other within the perimeter of the display surface. A failure detection circuit for testing the LEDs and phototransistors, by checking for blocked LED/phototransistor pairs. When a blocked pair is found the phototransistor of the blocked pair is paired with an LED near the blocked LED and the block LED is paired with a photo-transistor near the blocked LED to determine if they have failed.
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Doering Roger W.
McManus Colin F.
Digital Electronics Corporation
Oberley Alvin
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