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:
Nov. 12, 1991
Filed:
Jun. 29, 1989
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A light amount control apparatus contains an exposure lamp, a photo sensor for receiving light from the lamp, an AC power source for applying an AC voltage to the lamp, a CPU for computing an electric power to be supplied to the exposure lamp in accordance with magnifications and optical densities of originals by using the data signal outputted from the photo sensor, a lamp regulator for control an electric power supplied to the exposure lamp by using a value computed by the CPU, and a zero-cross generator for causing the CPU to periodically perform the computation in synchronism with the AC voltage of AC power source applied to the lamp.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile