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:
Apr. 21, 2020
Filed:
Apr. 23, 2019
Koichi Kawasaki, Kanagawa, JP;
Koichi Kawasaki, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes an image bearer, a charger, and a power source to apply to the charger a charging bias obtained by superimposing an AC voltage on a DC voltage. The power source includes a peak detection circuit to detect positive and negative peak values of a voltage of an AC component of the charging bias; and control circuitry to compare an absolute value of the positive peak value with an absolute value of the negative peak value, correct the AC voltage to cause the absolute value of the negative peak value to coincide with the absolute value of the positive peak value when the absolute value of the positive peak value is smaller, and to cause the absolute value of the positive peak value to coincide with the absolute value of the negative peak value when the absolute value of the negative peak value is smaller.