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:
Mar. 17, 1998
Filed:
Aug. 30, 1994
Yoshikazu Akiyama, Yokohama, JP;
Tomoyuki Yamaguchi, Chiba, JP;
Kakuji Murakami, Kawasaki, JP;
Yasuo Miyoshi, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An ink jet printing head includes a nozzle plate including nozzles, a plurality of ink cavities each containing ink, a plurality of actuators each made of a phase transition material, an oscillating plate having a top surface with which the ink in each ink cavity is brought into contact, and having a bottom surface bonded to each actuator, the oscillating plate pressing the ink in each ink cavity in association with the actuators to discharge ink drops from the nozzles at a sheet of paper so that an image is printed on the paper. In this ink jet printing head, the ink in each ink cavity is pressed by the oscillating plate in accordance with volumetric changes of the actuators, the volumetric changes being developed by applying an electric field to each actuator at a given electric field intensity, the given electric field intensity causing a transition of the phase transition material from an antiferroelectric phase into a ferroelectric phase to take place or causing a transition of the phase transition material from the ferroelectric phase into the antiferroelectric phase to take place.