Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1983-02-02
1988-12-13
Goldberg, Elliot
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
346110R, 346136, G01D 902, G01G 1514
Patent
active
047914335
ABSTRACT:
In a line scan fiber optic cathode ray graphic recorder a continuous sheet of light sensitive paper is drawn perpendicularly before a regularly timed intensity modulated beam from the cathode ray tube. Due to gearing inaccuracies and anomalies, the velocity at which the paper is drawn past the beam varies cyclically resulting in a variation in the spacing between each recorded data line on the paper. For higher paper velocities, the recorded lines are closer together, and for lower paper velocities, the recorded lines are farther apart. The closer lines create a darker image band on the paper and the more distant lines create a lighter image band on the paper. The present invention includes paper velocity monitoring means which provides an input signal to a compensation circuit for inversely varying the intensity information of each pixel dot as a function of the paper velocity. That is for higher than average velocities, the image intensity is proportionately reduced and at lower than average velocities the image intensity is proportionately increased to create a more uniform appearance of the total recorded image on the paper.
REFERENCES:
patent: 4095235 (1978-06-01), Quarton
patent: 4335390 (1982-06-01), Axford
patent: 4412230 (1983-10-01), Goldberg
patent: 4442442 (1984-04-01), O'Dell
Goldberg Elliot
Gray Francis I.
Jones Allston L.
Preston Gerald E.
Tektronix Inc.
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