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:
Jun. 06, 2000
Filed:
Dec. 24, 1998
Atsuo Tokunaga, Hatano, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A power supplying apparatus for use in an electrophotographic apparatus. A switching device outputs an output current when a pulse of an input current is applied thereto, a switching control device controls a switching operation of the switching device by applying the pulse, and a transformer, a primary winding of which is connected with an output terminal of the switching device, generates a prescribed output voltage at its secondary winding by stepping-up an input voltage induced at the primary winding. The power supplying apparatus further includes a rectifying-smoothing device connected with the secondary part of the transformer, which rectifies and smooths an output current of the transformer, a parallel resistance member connected in parallel with the secondary winding of the transformer by the rectifying-smoothing device, and an output terminal with a first side connected with a higher potential terminal of the parallel resistance and a second side connected with a process device of the electrophotographic apparatus grounded. The switching control device controls the switching operation of the switching device in a first mode such that a prescribed amount of constant current flows through the output terminal and in a second mode such that no current flows through and a prescribed voltage is induced at the output terminal.