Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Reexamination Certificate
2008-01-29
2008-01-29
Liang, Regina (Department: 2629)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
C345S166000
Reexamination Certificate
active
07324086
ABSTRACT:
A data input device for use with a tracking surface having light-scattering properties. The device comprises a single laser configured to project a light beam onto the tracking surface. A portion of the light beam striking the tracking surface reflects back into a cavity of the laser and thereby alters at least one characteristic of the projected light beam. A detector associated with the laser detects the altered characteristic of the light beam projected by the laser. A controller responsive to the detector determines the relative distance between the device and the tracking surface as a function of the altered characteristic of the projected light beam detected by the detector. Another device comprises a laser projecting a light beam oriented substantially perpendicular to the tracking surface when the device is operating in a tracking mode.
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Liang Regina
Microsoft Corporation
Senniger Powers
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