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. 21, 1976
Filed:
Aug. 05, 1975
Herbert Schroter, Taunusstein, D;
Werner Dennhardt, Taunusstein, D;
Abstract
This invention relates to a process for automatically changing the illumination intensity of a light source in a copying apparatus in which the transparency of the original is measured with at least one light-sensitive measuring unit and in which, based on the measured transparency, a signal is passed on from this measuring unit for controlling the speed of a drive motor, comprising comparing the signal coming from the light-sensitive measuring unit and passed on for controlling the speed of the drive motor with a predetermined signal corresponding to the highest speed of the drive motor and, if the measured signal requires a higher speed than that of the predetermined signal, the difference of the two signals is formed and the illumination intensity is controlled in correspondence with this difference signal. The invention also relates to an apparatus for performing the process.