Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Reexamination Certificate
2005-04-11
2008-12-02
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
C250S208200
Reexamination Certificate
active
07460107
ABSTRACT:
A computer input device includes a light guide that illuminates a target area for imaging so as to permit tracking relative motion of a surface. The light guide also directs light to a window that is externally visible to a user of the device when the device rests upon a supporting surface. In one form, the light guide includes an entrance surface that receives light from a light source, together with two separated channels. The light guide directs a portion of the light incident upon the entrance surface through a first channel to the target area. The light guide further directs a portion of the incident light through a second channel so as to illuminate the window.
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Hjerpe Richard
Kumar Srilakshmi K
Merchant & Gould P.C.
Microsoft Corporation
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