Digitizer tablet with illuminable working surface

Details Digitizer tablet with illuminable working surface Digitizer tablet with illuminable working surface

1991-01-30

1992-10-06

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

178 19, 340712, 340716, 362 33, 362 97, G08C 2100

Patent

active

051533863

ABSTRACT:
A digitizer tablet is provided in which the working surface is illuminated by a light source which includes optical structure located over the grid or electrode array of the position determining structure of the digitizer to provide a surface-lit tablet, or beneath the grid or electrode array to provide a back-lit tablet. Preferably, a space is provided adjacent the working surface to reduce undesirable lighting effects. A fiber optics panel or an electroluminescent panel may be used as the optical structure placed above or beneath the grid to illuminate the working surface. The position determining structure and the optical structure may be integrated into a single unit to form a digitizer with an illuminated working surface, or the optical structure may be provided as a separate unit for use with a digitizer to provide an illuminated working surface for the digitizer.

REFERENCES:
patent: 4206314 (1980-06-01), Prugh et al.
patent: 4532395 (1985-07-01), Zukowski
patent: 4654762 (1987-03-01), Laverick
patent: 4672153 (1987-06-01), Kikuchi
patent: 4723836 (1988-02-01), Kono et al.
patent: 4730186 (1988-03-01), Koga et al.
patent: 4812831 (1989-03-01), Laier
patent: 4943689 (1990-07-01), Seifer et al.
patent: 5028744 (1991-07-01), Purcell et al.
ID: The Intelligent Digitizer Advertisements of Summagraphics Corporation.
Drawing of ID Translucent Tablet, Ref. SCG-380.
BYTE Magazine, Jan. 1989, pp. 162-174.

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