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. 13, 2021
Filed:
Jan. 08, 2020
Kyocera Document Solutions Inc., Osaka, JP;
Takuji Watanabe, Osaka, JP;
Norio Tomiie, Osaka, JP;
KYOCERA Document Solutions Inc., Osaka, JP;
Abstract
In an image forming apparatus, a bias controller varies one, while keeping the other fixed, of a charging alternating-current frequency, which is the frequency of the charging alternating-current voltage, and a developing alternating-current frequency, which is the frequency of the developing alternating-current voltage. Specifically, in a case where interference fringes appear in a developed image due to interference between the charging and developing alternating-current frequencies, when the recognizable minimum pitch of the interference fringes is A(mm), the width of the variation region of the other frequency is B(Hz), the rotation speed of an image carrying member is C(mm/sec), and the variation speed of the other frequency in the variation region is D(Hz/sec), the bias controller varies the other frequency at a variation speed Dthat fulfills |D|>B/(A/C).