Telegraphy – Systems – Position coordinate determination for writing
Patent
1992-10-07
1993-09-28
Schreyer, Stafford
Telegraphy
Systems
Position coordinate determination for writing
G08C 2100
Patent
active
052488560
ABSTRACT:
An electromagnetic-field-responsive (preferably optical), code-based, graphic data-acquisition system for tracking the operational status of a mobile write-effective component (stylus, eraser, etc.) in relation to a defined writing-surface area. The preferred embodiment features an active optical structure which is disposed adjacent the writing-surface area for creating, by scanning, a defined zone of optical radiation, optically reactive, retroreflective code structure which is joined to the mobile component and which is capable of reacting (reflecting the same) to radiation within the zone when the code structure intersects the zone, a reaction monitoring structure for monitoring the reaction behavior of the code structure and for producing a related response, and interpretation structure which acquires that response and determines therefrom the desired operational-status-tracking information. Modification to this preferred structure are also illustrated and discussed.
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Microfield Graphics, Inc.
Schreyer Stafford
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