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:
Dec. 11, 2001
Filed:
Jun. 23, 1998
Takashi Oota, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In an ink jet recording head having a structure wherein grooves are formed on a piezo-electric ceramic substrate by a cutting work and the resulting side walls of the grooves are driven to thereby jet each ink in the grooves, fine cracks appears in the surface layer portion of the side wall during the time of the cutting work, accordingly the strength of the side walls is reduced, a long time driving of the side walls develops the cracks to end in the destruction and so on, which causes a problem of the reliability to be overcome. The cracks occurred in the surface layer portion of the side walls,are penetrated by an oxide,for being mended. The piezo-electric ceramic substrate with the grooves is coated with a solution obtained by solving the constituent elements of the oxide into a solvent and is fired so that the side walls are reinforced.