Telegraphy – Systems – Position coordinate determination for writing
Patent
1989-07-20
1990-05-01
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
340700, 362 33, 362 84, G08C 2100
Patent
active
049220608
ABSTRACT:
A series of enhancements to a digitizing pad, information overlay and input selector, which are used as input devices for many computer-aided design programs, eliminating operator fatigue caused by conflicting lighting requirements, viewing levels and focusing distances required for the digitizing pad and computer screen. The use of fluorescent color for symbols on the information overlay, illuminated by black light, provides an information overlay which can be used in the same low light which is best for computer screen reading and which closely simulates the background and contrast of the computer screen. The active area of the input selector, called the window, is also outlined in fluorescent color to facilitate use in the low light environment. The information overlay is viewed through a mirror which can be adjusted to the same height as the computer screen. These enhancements create an information overlay which can be viewed in the same lighting environment at the same eye level, with the same contrast and the same focal length as the computer screen, but which may be operated without raising the hand or input selector off the desktop.
REFERENCES:
patent: 4414609 (1983-11-01), Shemitz
Charmasson Henri J. A.
Schreyer Stafford D.
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