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:
May. 14, 2019
Filed:
Oct. 26, 2017
Masahiko Ishikawa, Shizuoka, JP;
Hiroshi Gotou, Kanagawa, JP;
Takahiro Yoshida, Ibaraki, JP;
Yukio Otome, Ibaraki, JP;
Masahiko Ishikawa, Shizuoka, JP;
Hiroshi Gotou, Kanagawa, JP;
Takahiro Yoshida, Ibaraki, JP;
Yukio Otome, Ibaraki, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An ink discharge device is provided including an ink, an ink discharge head, and a circulator. The ink discharge head includes a nozzle, an individual liquid chamber communicated with the nozzle, a flow-in channel, and a flow-out channel. The circulator circulates the ink by letting the ink flow into the individual liquid chamber via the flow-in channel and flow out from the individual liquid chamber via the flow-out channel. A flow rate of the circulated ink is 0.10 to 1.50 times a maximum dischargeable rate of the ink discharge head. A dynamic surface tension A of the ink at 25° C. is 34.0 mN/m or less when measured by a maximum bubble pressure method at a surface lifetime of 15 msec, and the dynamic surface tension A and a static surface tension B of the ink at 25° C. satisfy the following relation:10.0(%)≤[()/()]×100≤19.0(%).