Patents by Inventor Hitoshi Asayama

Hitoshi Asayama 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 manufacturing discharge tube and discharge lamp
    Patent number: 6729925
    Abstract: In a method for manufacturing a discharge tube including a discharge part, a sealing part formed at an end of the discharge part, and an electrode provided in the discharge part, the method includes inserting an electrode body having the electrode into a portion to be the sealing part that is adjacent to a portion to be the discharge part of a transparent insulating tube serving as a material for the discharge tube, and then sealing the portion to be the sealing part by heating and softening with a combination of a laser beam and a gas burner, thus forming the sealing part. Heat sources are selected suitably according to each region in the portion to be the sealing part, whereby a high-quality discharge tube that is highly resistant to pressure can be manufactured at high production efficiency and low cost.
    Type: Grant
    Filed: December 20, 2001
    Date of Patent: May 4, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takeshi Meguro, Kazuhiko Senoo, Motomi Sakoda, Hitoshi Asayama
  • Method for manufacturing discharge tube and discharge lamp
    Publication number: 20020098767
    Abstract: In a method for manufacturing a discharge tube including a discharge part, a sealing part formed at an end of the discharge part, and an electrode provided in the discharge part, the method includes inserting an electrode body having the electrode into a portion to be the sealing part that is adjacent to a portion to be the discharge part of a transparent insulating tube serving as a material for the discharge tube, and then sealing the portion to be the sealing part by heating and softening with a combination of a laser beam and a gas burner, thus forming the sealing part. Heat sources are selected suitably according to each region in the portion to be the sealing part, whereby a high-quality discharge tube that is highly resistant to pressure can be manufactured at high production efficiency and low cost.
    Type: Application
    Filed: December 20, 2001
    Publication date: July 25, 2002
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takeshi Meguro, Kazuhiko Senoo, Motomi Sakoda, Hitoshi Asayama