Optical-mechanical roller with ratchet
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United States of America Patent
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Aug 6, 2002
Issued Date -
N/A
app pub date -
Dec 1, 2000
filing date -
Oct 14, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A pointing device, such as a mouse, track ball or joystick, having a roller. The roller itself has either a plurality of slits or reflective strips for optical detection. A photoemitter and photodetector are positioned to detect rotation of the roller. Thus, the present invention eliminates the need for coupling to a separate optical encoder. The roller can be depressed to cause the actuation of a microswitch. In a preferred embodiment, the photoemitter and photodetector are aligned along a vertical axis, such that the position information is not affected by the vertical depressing of the roller.
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