CTX Virtual Technologies The VK200 KEYFOB Virtual Keyboard - Manual (Page 14)

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FUNCTION IS INCORRECT
If one or more of the above modules are blocked
by some cause, the projected keyboard image
may not be displayed correctly or, the location
and movement of the typist’s fingers may not be
recognized correctly. Use only a completely flat
surface.
4. IDENTIFYING PARTS AND
THEIR FUNCTIONS.
1. Projector: Uses a red laser to project the image of a
keyboard onto a flat surface in front of the typist.
2. Sensor: Picks up the infrared light reflected off the
typist’s fingers and triangulates the location of the
reflected light to determine which key was pressed.
This sensor provides a keyboard function.
3. IR Light Window: Uses an infrared laser to emit an
invisible plane of light a few millimeters above the
projection surface so that the infrared light can be
reflected off of the typist’s fingers to the sensor.