Patents by Inventor Kohshi Nomura

Kohshi Nomura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electrostatic inkjet head having an accurate gap between an electrode and a diaphragm and manufacturing method thereof
    Patent number: 6341847
    Abstract: An electrostatic inkjet head has an accurately controlled, uniform gap between a diaphragm and an electrode. The gap between the electrode and the diaphragm is defined by a depth of a depression formed in the diaphragm substrate or the electrode substrate. The depression is formed by removing an oxidation layer which is formed by selectively oxidizing a portion of the diaphragm substrate or the electrode substrate. The depth of the depression is determined by a thickness of a portion of the oxidation layer, which portion extends from a surface of the diaphragm substrate or the electrode surface. Since the thickness of the oxidation layer is accurately controlled, the depth of the depression is also accurately controlled. Accordingly, a dimension of the gap between the diaphragm and the electrode is extremely accurate.
    Type: Grant
    Filed: September 22, 1999
    Date of Patent: January 29, 2002
    Assignee: Ricoh Company, Ltd.
    Inventors: Eiichi Ohta, Makoto Tanaka, Kohshi Nomura