Patents by Inventor Takanobu Fujisawa

Takanobu Fujisawa 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).

  • Method for apparatus for producing a nozzle plate of an ink-jet head printer
    Patent number: 6170934
    Abstract: In a nozzle plate production method and apparatus, a metallic sheet material is punched to form nozzle holes therein by using a press having punches. Each of the punches includes a tapered conical portion, a straight cylindrical portion, and a rounded interconnecting portion. The interconnecting portion smoothly interconnects the conical portion and the cylindrical portion. Nibs produced on a bottom surface of the sheet material at the nozzle holes by the nozzle hole punching are removed by use of a tape grinding machine. A top surface and the bottom surface of the sheet material are buffed to provide a predetermined level of surface roughness. Burrs produced on the top and bottom surfaces of the sheet material at the nozzle holes by the buffing are removed by ultrasonic cleaning.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: January 9, 2001
    Assignee: Fujitsu Limited
    Inventors: Takanobu Fujisawa, Yoshiaki Kawasaki, Tooru Tsukahara, Terukazu Kawarada, Masaharu Suzuki