Pen control circuit

Details Pen control circuit Pen control circuit

1986-04-01

1987-04-21

Hartary, Joseph W.

Recorders

Markers and/or driving means therefor

Stylus feature

318687, G01D 1524

Patent

active

046600558

ABSTRACT:
A pen control circuit includes a current control circuit for controlling the magnitude of a driving force of a drive coil, a feedback circuit for supplying a feedback signal to the current control ciruit, a clipper for extracting the pen position detection signal only when the level of the pen is higher than a predetermined level with respect to a recording surface, and a selector for selecting first, an output from the clipper as a drive current setting value of the current control circuit during an initial pen-down period and second, the pen pressure setting signal as the drive current setting value after the output from the clipper is disabled. The pen control circuit also includes a current setting circuit for supplying a predetermined drive current setting value to the current control circuit in a pen-up mode and a limiter for limiting a current supplied to the drive coil in accordance with a pen position detection signal when the pen is moved upward to a predetermined position.

REFERENCES:
patent: 3864695 (1975-02-01), Nagashima
patent: 4527108 (1985-07-01), Enda
patent: 4567565 (1986-01-01), Haselby
"An Intelligent Plotter for High-Throughput, Unattended Operation": by Martin L. Stone, et al., Apr. 1985 Hewlett-Packard Journal, p. 25.
"Low-Mass, Low-Cost Pen-Lift Mechanism for High-Speed Plotting" by Tammy V. Herr, Apr. 1985 Hewlett-Packard Journal, pp. 29, 30.

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