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:
Oct. 19, 1982
Filed:
Jan. 21, 1981
Kenji Futaki, Kawasaki, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
According to an exposure control device for a photocopier of the present invention, a voltage corresponding to the voltage applied to an exposure lamp is produced by a dummy load circuit and a wave shaper. The light reflected by the manuscript is detected by a photodetector and is converted into a voltage. The output voltage of the wave shaper and the output voltage of the detector are added by an adding switch. The added output voltage and the reference voltage are input to an error amplifier and are compared. The output signal of the error amplifier is input to a trigger pulse generator. The trigger pulse generator supplies a trigger pulse to a thyristor connected to the exposure lamp for controlling the amount of light of the exposure lamp.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile