Patents by Inventor Kazuo Takita

Kazuo Takita 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).

  • Lighting apparatus including circuit to detect an electrical characteristic of a component of a lamp mounted in the apparatus
    Patent number: 6184632
    Abstract: A lighting apparatus of the present invention includes a discharge lamp incorporating a detecting element having a predetermined electrical characteristic, a detector circuit to discriminate the electrical characteristic of the detecting element and a lighting circuit to light the discharge lamp according to the output from the detector circuit. According to the lighting apparatus of the present invention, it is possible to detect whether a discharge lamp mounted in the socket is an adapted lamp without necessity for lighting the discharge lamp.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: February 6, 2001
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Masahiko Kamata, Kazutoshi Mita, Kazuo Takita
  • Nitride layer for discharge lamps
    Patent number: 5668440
    Abstract: In a discharge lamp having a discharge medium sealed in a discharge tube assembly including electrodes for producing a discharge, a nitride layer is formed on a surface of an envelope tube of the discharge tube assembly. The nitride layer is formed by substituting an oxygen component of an oxide constituting the tube wall of the envelope tube with nitrogen, and exhibits a continuous and smooth reduction in nitride content in the direction of depth. This chemically stable nitride layer prevents a reaction between the discharge medium and the tube wall material, and removal or injection of the discharge medium. In addition, since the nitride layer also exhibits a continuous change in thermal expansion coefficient in the direction of depth, the thermal stress is reduced, and cracking, peeling, removal, and the like do not occur.
    Type: Grant
    Filed: May 17, 1995
    Date of Patent: September 16, 1997
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Shinji Inukai, Kazuo Takita, Makoto Nishizawa, Akira Itoh, Kazuyoshi Okamura, Kazuiki Uchida, Takayuki Aoki, Kazuhiko Yoshikawa, Akihiro Yonezawa, Hiroki Sasaki
  • Lamp having a glass envelope with fluorocarbon polymer layer
    Patent number: 5243251
    Abstract: This invention provides an improved layer coated on the outer surface of the envelope of high intensity discharge lamps, halogen lamps and so on. The overcoated layer is provided for preventing glass pieces of the envelope from scattering when the glass envelope is broken. Therefore the improved and strengthened layer comprises a fluorocarbon polymer containing metal oxide grains dispersed therein. The metal oxide grains are dispersed in the fluorocarbon polymer since the overcoated layer is heated at more than 200.degree. C. Further, for the purpose of strengthening the overcoated layer, the overcoated layer has an even density of the metal oxide grains in the fluorocarbon polymer. The even density of the metal oxide grains in the fluorocarbon polymer is obtained only by this invention of the coating method that includes a electrostatic coating step.
    Type: Grant
    Filed: October 14, 1992
    Date of Patent: September 7, 1993
    Assignee: Toshiba Lighting & Technology Corporation
    Inventors: Shinji Inukai, Satoshi Iwasawa, Kazuo Takita, Katsusuke Uchino