Marking system with pen-up/pen-down tracking

Details Marking system with pen-up/pen-down tracking Marking system with pen-up/pen-down tracking

1993-11-05

1995-07-18

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

345179, G08C 2100

Patent

active

054343704

ABSTRACT:
A system and method for detecting movement of an object along an axis normal to a planar surface is described. The invention is applied to a graphic data-acquisition system in which a digitized record is produced according to the X, Y and Z location of a writing implement relative to a writing surface. An expanse of electromagnetic radiation is generated in a zone closely adjacent to the writing surface. An electromagnetic-interactive structure is associated with the writing implement at a location where it will interact with the expanse when the pen is in a write mode. The configuration of the radiation-interactive structure and its positioning relative to the expanse allows the production of an analog data stream which may be correlated to relative distance between the tip of the pen and the writing surface. After fine analog data is digitized, a processing routine is used to determine reliably and accurately when the pen has moved to the non-write mode. The processor is configured to perform the desired discriminatory function with minimal occurrences of false positives relating to pen tilting, writing velocity and board irregularity.

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Optical Devices: Lasers; National Aeronautics and Space Administration.
Polyvision; manufactured by Polytronix, Inc.
Pinpointing Coordinates with Laser Beam Scanning; Position feedback opens up applications from the classroom to the surgical suite; by Gerald F. Marshall, Jagmohan S. Gadhok and John L. Junkins.
Electronic Blackboard Technology; Manufactured by Digital Scanning Systems.

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