CTX Virtual Technologies The VK200 KEYFOB Virtual Keyboard - Manual (Page 12)

11
HOW THIS PRODUCT WORKS
This product emits infrared light from the lower end
of the product to detect objects such as fingers. When
an object passes through the area illuminated by
the infrared light source, any infrared light reflecting
off the object is detected by the sensor. Information
on the position and movement of the object is then
analyzed to perform the product’s role as a keyboard.
Sensitivity: difference in thickness, shape, and color of
the user’s fingers or operating environment result in
differences in the amount of reflected infrared light. If
the amount of reflected infrared light is appropriate,
the sensor will have no problem detecting objects
such as fingers. However, if the amount of reflected
infrared light becomes low because of the causes
mentioned above or some other cause, the keystroke
recognition rate may decrease or your keystrokes
may not be recognized at all. On the other hand, if
the amount of reflected infrared light is too high, the
keystroke recognition may become too sensitive or
a “hovering Effect” may occur where a keypress may
occur when you have not yet touched the projected
surface. See section “Adjusting the Sensitivity” for
corrective steps.