Patents by Inventor Tatsuo Otabe

Tatsuo Otabe 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).

  • High-pressure discharge lamp
    Patent number: 6448712
    Abstract: A high-pressure discharge lamp which includes a light-transmitting air-tight discharge container, an electrode formed of tungsten as a main component and fixedly sealed in the discharge container, and a discharge medium containing a halide of a light emitting metal and sealed in the discharge container. The surface of the electrode is defined as follows. That is, the average value of center line average roughness Ra of the surface, is set to 0.3 &mgr;m or less, or the average value of the center line average roughness Rz of the surface of the electrode, is set to 1.0 &mgr;m or less, or the average value of the surface area increasing rate of the surface of the electrode is set to 1.0% or less.
    Type: Grant
    Filed: January 11, 2001
    Date of Patent: September 10, 2002
    Assignee: Toshiba Lighting and Technology Corporation
    Inventors: Hisashi Honda, Seiji Ashida, Kiyoshi Saita, Ariyoshi Ishizaki, Akira Itoh, Shigehisa Kawatsuru, Tatsuo Otabe
  • High-pressure discharge lamp and illumination device
    Publication number: 20010008365
    Abstract: A high-pressure discharge lamp which includes a light-transmitting air-tight discharge container, an electrode formed of tungsten as a main component and fixedly sealed in the discharge container, and a discharge medium containing a halide of a light emitting metal and sealed in the discharge container. The surface of the electrode is defined as follows. That is, the average value of center line average roughness Ra of the surface, is set to 0.3 &mgr;m or less, or the average value of the center line average roughness Rz of the surface of the electrode, is set to 1.0 &mgr;m or less, or the average value of the surface area increasing rate of the surface of the electrode is set to 1.0% or less.
    Type: Application
    Filed: January 12, 2001
    Publication date: July 19, 2001
    Applicant: Toshiba Lighting and Technology Corporation
    Inventors: Hisashi Honda, Seiji Ashida, Kiyoshi Saita, Ariyoshi Ishizaki, Akira Itoh, Shigehisa Kawatsuru, Tatsuo Otabe
  • High-pressure discharge lamp including a limited amount of carbon remaining on an electrode surface
    Patent number: 6249086
    Abstract: A high-pressure discharge lamp which includes a light-transmitting air-tight discharge container, an electrode formed of tungsten as a main component and fixedly sealed in the discharge container, and a discharge medium containing a halide of a light emitting metal and sealed in the discharge container. The surface of the electrode is defined as follows. That is, the average value of center line average roughness Ra of the surface, is set to 0.3 &mgr;m or less, or the average value of the center line average roughness Rz of the surface of the electrode, is set to 1.0 &mgr;m or less, or the average value of the surface area increasing rate of the surface of the electrode is set to 1.0% or less.
    Type: Grant
    Filed: December 10, 1999
    Date of Patent: June 19, 2001
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Hisashi Honda, Seiji Ashida, Kiyoshi Saita, Ariyoshi Ishizaki, Akira Itoh, Shigehisa Kawatsuru, Tatsuo Otabe
  • High-voltage discharge lamp, high-voltage discharge lamp device, and lighting device
    Patent number: 6215254
    Abstract: The present invention provides a high-voltage discharge lamp having an internal volume of 0.05 cc or less that is small yet maintains a desirable lifetime and a high luminous efficiency, a high-voltage discharge lamp device using the lamp, and a lighting apparatus using the lamp. The high-voltage discharge lamp comprises a ceramic discharge vessel that has a spherical, bulging section and a pair of small diameter cylindrical sections. The spherical, bulging section surrounds a discharge space. The small diameter cylindrical sections are connected to the ends of the spherical, bulging section. Electrode-integrated power-supplying conductors are used. Each conductor comprises a seal part and a halide-resistant part. The halide-resistant part having a proximal end connected to the distal end of the seal part. The distal end of the halide-resistant part projects into the spherical, bulging section of the translucent ceramic discharge vessel forming an electrode.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: April 10, 2001
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Hisahi Honda, Seiji Ashida, Kiyoshi Saita, Tatsuo Otabe, Masuo Shibuya, Noriji Watanabe