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, 2020
Filed:
Mar. 06, 2019
Takashi Watanabe, Kanagawa, JP;
Taku Hatakeyama, Kanagawa, JP;
Kaoru Tadokoro, Kanagawa, JP;
Sho Oyamatsu, Tokyo, JP;
Tomohiro Inoue, Kanagawa, JP;
Hiroshi Gotou, Kanagawa, JP;
Mio Kumai, Tokyo, JP;
Takashi Watanabe, Kanagawa, JP;
Taku Hatakeyama, Kanagawa, JP;
Kaoru Tadokoro, Kanagawa, JP;
Sho Oyamatsu, Tokyo, JP;
Tomohiro Inoue, Kanagawa, JP;
Hiroshi Gotou, Kanagawa, JP;
Mio Kumai, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An ink set comprises black ink having a static surface tension A and yellow ink having a static surface tension B, wherein the static surface tension A is 28.7 mN/m or more and greater than the static surface tension B, wherein the ink set is used in an image forming device including an inkjet head including a nozzle plate including a first nozzle array and a second nozzle array disposed adjacent to the first nozzle array, the first nozzle array including multiple first nozzles configured to discharge the black ink and a second nozzle array including multiple second nozzles configured to discharge the yellow ink wherein each nozzle of the multiple first nozzles and the multiple second nozzles has a cylindrical portion having a length of 25 μm or longer along an axial direction with an opening on an ink discharging side of the nozzle plate.