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:
Dec. 10, 2013
Filed:
Feb. 22, 2012
Kaoru Satoh, Kanagawa, JP;
Sumiaki Aoki, Kanagawa, JP;
Kaoru Satoh, Kanagawa, JP;
Sumiaki Aoki, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming device includes a liquid discharge head including piezoelectric elements; a drive waveform generating unit that outputs a drive waveform; a selection unit that applies the drive waveform to the piezoelectric elements; a resonant frequency adjusting circuit that is connected in parallel with the piezoelectric elements; a switch unit that switches the resonant frequency adjusting circuit; and a switching control unit that causes the switch unit to switch in accordance with a first number of simultaneously driven piezoelectric elements. When the first number of the simultaneously driven piezoelectric elements is greater than a predetermined number, the switching control unit connects the resonant frequency adjusting circuit, so that a resonant frequency of a closed loop becomes lower than a resonant frequency of the closed loop when the first number of the simultaneously driven piezoelectric elements is less than the predetermined number.