Illumination apparatus for a digitizer tablet with improved ligh

Details Illumination apparatus for a digitizer tablet with improved ligh Illumination apparatus for a digitizer tablet with improved ligh

1995-03-01

1998-04-07

Kuntz, Curtis

Telegraphy

Systems

Position coordinate determination for writing

178 19, 178 87, 345173, 345175, 345176, G08C 2100, G09G 302

Patent

active

057366861

ABSTRACT:
An illumination apparatus for a digitizer tablet includes a support structure and a solid sheet optical light guide supported by the support structure and having first and second opposing surfaces and a plurality of edges. Light sources are carried by the support structure and positioned to direct light into light-receiving edges of the light guide. Reflecting structure is disposed adjacent the first surface of the light guide. A predetermined pattern is disposed on the first surface of the light guide structured and arranged in accordance with distance from the light sources.

REFERENCES:
patent: 4943689 (1990-07-01), Siefer
patent: 4985809 (1991-01-01), Matsui et al.
patent: 5001306 (1991-03-01), Purcell
patent: 5028744 (1991-07-01), Purcell
patent: 5134549 (1992-07-01), Yokoyama
patent: 5153386 (1992-10-01), Seifer et al.
patent: 5359155 (1994-10-01), Helser
patent: 5565657 (1996-10-01), Merz

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