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:
Jan. 20, 2009
Filed:
Dec. 19, 2005
Takahiro Yamada, Hitachinaka, JP;
Shinya Kobayashi, Hitachinaka, JP;
Satoru Tobita, Hitachinaka, JP;
Katsuya Kawai, Hitachinaka, JP;
Hitoshi Kida, Hitachinaka, JP;
Takahiro Yamada, Hitachinaka, JP;
Shinya Kobayashi, Hitachinaka, JP;
Satoru Tobita, Hitachinaka, JP;
Katsuya Kawai, Hitachinaka, JP;
Hitoshi Kida, Hitachinaka, JP;
Ricoh Printing Systems, Ltd., Tokyo, JP;
Abstract
An ink jet recording head unit includes a plurality of nozzle elements, a plurality of piezoelectric elements and a driving unit. The plurality of piezoelectric elements is provided in one-to-one correspondence with the plurality of nozzle elements. Each piezoelectric element has a positive pole and a negative pole. Each piezoelectric element expands and contracts when a voltage potential difference between the positive pole and the negative pole is varied. The plurality of nozzle elements includes a first nozzle element and a second nozzle element adjacent to the first nozzle element. A first piezoelectric element and a second piezoelectric element correspond to the first nozzle element and the second nozzle element respectively. The driving unit controls the first piezoelectric element and the second piezoelectric element to expand and contract in a complementary manner.