The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 13, 1988
Filed:
Feb. 02, 1983
Samuel W Mallicoat, Portland, OR (US);
Tektronix, Inc., Beaverton, OR (US);
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.