Method and apparatus to control a drawing machine attached to a

Details Method and apparatus to control a drawing machine attached to a Method and apparatus to control a drawing machine attached to a

1980-06-20

1982-08-24

Robinson, Thomas A.

Telegraphy

Systems

Position coordinate determination for writing

33 1M, G06F 308, G06K 1520

Patent

active

043462600

ABSTRACT:
An improved method for controlling a drawing machine of the type that is connected to a computer by means of a digitizing device, and comprises a sensor plate and sensor. The method comprises the steps of horizontally projecting an image, from the drawing table surface, through the back side of a translucent sensor plate, and thereby reproducing said image conformably upon the front side thereof as a drawing field, which thereby comprises a screen upon which a digitizing sensor is operable to be employed. There is also taught an important device for controlling a drawing machine of the type that is connected to a computer by means of a sensor plate, containing therewithin a sensor field track, for sensing the position of an associated sensor. The improved device comprises a projector that is adapted to focus an image from a drawing table surface upon a drawing field surface of a sensor plate which is translucent, and contains the sensor field track. The device thereby forms a drawing field which is visible on the upper side of said sensor plate, to enable following thereof by the sensor.

REFERENCES:
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patent: 3651509 (1972-03-01), Ngo
patent: 3758717 (1973-09-01), Granzotti
patent: 3781846 (1973-12-01), Eichelberger et al.
patent: 3873769 (1975-03-01), Cotter
patent: 3917955 (1975-11-01), Inuiya
patent: 3973245 (1976-08-01), Belser
patent: 4110014 (1978-08-01), Yevick
patent: 4139803 (1979-02-01), Kurahaphi et al.
patent: 4177354 (1979-12-01), Mathews

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