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:
Oct. 20, 2015
Filed:
Feb. 14, 2013
Kohta Akiyama, Tokyo, JP;
Kohta Akiyama, Tokyo, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
An image forming apparatus includes: and a unit that electrically shuts off a pressure generating unit corresponding to a nozzle ejecting no droplet, from a drive waveform generating unit for a period of a time Tb satisfying a relation Tb≧T, and that applies, at a time after the shutoff, a voltage of a potential Vto the pressure generating unit, where a potential serving as a reference for the drive waveform is denoted as V, a minimum potential difference from the potential Vrequired to displace a pressure generating unit to vibrate a meniscus with ejecting no liquid droplet from a nozzle is denoted as ΔV, a time required for a potential to drop by the potential difference ΔVdue to self-discharge after a pressure generating unit is charged to a predetermined potential is denoted as T