Digitizer with illuminable working surface

Details Digitizer with illuminable working surface Digitizer with illuminable working surface

1990-01-11

1991-07-02

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

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

Patent

active

050287443

ABSTRACT:
Digitizer tablet and digitizer tablet structure having an illuminable working surface are disclosed. A space between a top translucent layer having the working surface and a source of light is provided so as to eliminate or minimize undesirable lighting effects at the working surface. In the preferred embodiments, the space is an air gap (e.g. 0.060-0.250 inch) immediately adjacent the top translucent layer. The air gap is formed by transparent optical fibers or solid glass or acrylic rods. Back-lighted, translucent, back-lightable (without light source) and surface lighted digitizer tablet embodiments are described.

REFERENCES:
patent: 4206314 (1980-06-01), Prugh et al.
patent: 4654762 (1987-03-01), Laverick
patent: 4672153 (1987-06-01), Kikuchi
ID: The Intelligent Digitizer Advertisement of Summagraphics Corporation.

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