Computer graphics processing and selective visual display system – Display peripheral interface input device
Patent
1993-01-06
1996-06-11
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
324253, G09G 500
Patent
active
055260225
ABSTRACT:
A sourceless orientation sensor having an azimuthal sensor which determines the azimuthal orientation relative to a planetary magnetic field, and a tilt sensor which determines the direction and magnitude of the displacement from vertical using the planetary gravitational field. The tilt sensor includes a transparent gas and a transparent viscous fluid in a spherical shell, a light emitting diode (LED) mounted at the top of the shell, and four photodetectors mounted at the bottom of the shell. As the tilt sensor is rotated the path of the light cone emanating from the LED and refracting at the gas/fluid interface is altered, thereby altering the intensity of light incident on the photodetectors. The magnitude of the light incident on the photodetectors is processed to provide the tilt angles. A thin transparent disk floats at the gas/fluid interface to damp surface waves caused by reorientation of the device. A time sequence of orientations of the sensor may be interpreted to provided a gesture sensing device.
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de Groot Marc
Donahue Michael J.
Drumm Donald E.
Perry Michael A.
Pesce Mark D.
Virtual I/O, Inc.
Weldon Ulysses
LandOfFree
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