Patents by Inventor Katsushi Seki

Katsushi Seki 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).

  • Publication number: 20130182425
    Abstract: A lamp according to the present invention includes: a line portion which blocks a part of light proceeding from a light emitting unit in a direction perpendicular to a tube axis direction; and a raised portion which blocks the light proceeding from the light emitting unit in the direction perpendicular to the tube axis direction that is not blocked by the line portion. The raised portion has an end portion having a linear shape in the tube axis direction, the end portion being an end portion of a section of the raised portion that blocks light.
    Type: Application
    Filed: October 19, 2011
    Publication date: July 18, 2013
    Applicant: PANASONIC CORPORATION
    Inventors: Katsushi Seki, Toshifumi Ogata, Makoto Morikawa, Shinichi Kitaoka, Kenji Maruyama
  • Publication number: 20100039018
    Abstract: A spontaneous break in a glass tube can be sufficiently suppressed in a hot cathode low pressure discharge lamp. A hot cathode low pressure discharge lamp (10) includes a glass tube (1) in which a filament (2) is arranged. The glass tube (1) has a cross section that is flat in configuration, and a flattening x and a thickness ratio T satisfy the below expression, where the flattening x is a ratio A/B between a major diameter A and a minor diameter B of the cross section of the glass tube, the thickness ratio T is a ratio t/A between a thickness t of the glass tube and the major diameter A of the cross section of the glass tube, a=?0.809, b=0.728, c=?3.46, d=?0.0689, e=0.926, and f=?2.12.
    Type: Application
    Filed: September 26, 2007
    Publication date: February 18, 2010
    Inventor: Katsushi Seki
  • Publication number: 20090236988
    Abstract: It is possible to obtain electrodes 15 and 16 for a discharge lamp which are compact and have a large packing capacity for electron emitting material if an electrode for a discharge lamp is structured to include a quadruple coil 50 which is made by performing a first winding of a filament 41 to make a single coil 44, performing a secondary winding of the single coil 44 to make a double coil 46, performing a tertiary winding of the double coil 46 to make a triple coil 48 and performing a quaternary winding of the triple coil 48, and, in the quadruple coil 50, at least a hollow space 47? surrounded by the tertiary winding is structured to be packed with electron emitting material.
    Type: Application
    Filed: June 18, 2007
    Publication date: September 24, 2009
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Shiro Iida, Tamotsu Andou, Tatsuya Taniwaki, Katsushi Seki
  • Patent number: 7049763
    Abstract: An electrodeless discharge lamp operating device including a light-transmitting discharge bulb 120, an induction coil including a core 103 and a coil 104, and a ballast circuit 140 for supplying a high-frequency power to the induction coil. The operating frequency of the ballast circuit 140 is in the range of 80 kHz to 500 kHz, and where the operating frequency of the ballast circuit 140 is f (kHz) and the power input to the discharge bulb 120 is P (W), the rare gas pressure p (Pa) in the discharge bulb 120 satisfies the relationship of the following expression: p ? A P - B f 2 - C [ Expression ? ? 1 ] (where A, B and C are constants having the following values: A=4.0×104, B=3.5×104 and C=6.2), and the power input P to the discharge bulb 120 is 7 W at minimum and 22 W at maximum.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: May 23, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Akira Hochi, Takeshi Arakawa, Kiyoshi Hashimotodani, Katsushi Seki, Yuuji Omata, Yoshihisa Hagiwara
  • Publication number: 20050206322
    Abstract: An electrodeless discharge lamp operating device including a light-transmitting discharge bulb 120, an induction coil including a core 103 and a coil 104, and a ballast circuit 140 for supplying a high-frequency power to the induction coil. The operating frequency of the ballast circuit 140 is in the range of 80 kHz to 500 kHz, and where the operating frequency of the ballast circuit 140 is f (kHz) and the power input to the discharge bulb 120 is P (W), the rare gas pressure p (Pa) in the discharge bulb 120 satisfies the relationship of the following expression: p ? A P - B f 2 - C [ Expression ? ? ? 1 ] (where A, B and C are constants having the following values: A=4.0×104, B=3.5×104 and C=6.2), and the power input P to the discharge bulb 120 is 7 W at minimum and 22 W at maximum.
    Type: Application
    Filed: May 30, 2003
    Publication date: September 22, 2005
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD
    Inventors: Akira Hochi, Takeshi Arakawa, Kiyoshi Hashimotodani, Katsushi Seki, Yuuji Omata, Yoshihisa Hagiwara
  • Patent number: 6768254
    Abstract: A self-ballasted electrodeless discharge lamp includes a discharge vessel having a cavity, an induction coil that is inserted into the cavity, a ballast for supplying power to the induction coil, a case for covering the ballast, and a lamp base provided in the case. The discharge vessel is secured to the case via a holder. A part of the discharge vessel and a first portion of the holder are engaged with each other to constitute a combination structure. A second portion of the holder and a part of the case are engaged with each other to constitute a combination structure.
    Type: Grant
    Filed: April 26, 2002
    Date of Patent: July 27, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takeshi Arakawa, Mitsuharu Kawasaki, Kiyoshi Hashimotodani, Kenichiro Takahashi, Koji Miyazaki, Katsushi Seki, Toshiaki Kurachi, Kenji Itaya
  • Patent number: 6670759
    Abstract: An electrodeless discharge lamp includes an envelope filled with a luminescent material to be excited to emit light and a filling material that substantially does not discharge to emit light. The filling material stabilizes a discharge of the luminescent material.
    Type: Grant
    Filed: May 24, 2000
    Date of Patent: December 30, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Koichi Katase, Tsuyoshi Ichibakase, Katsushi Seki
  • Patent number: 6650068
    Abstract: The induction coil core used for an induction coil of a discharge lamp, the discharge lamp including: a bulb containing discharge gas inside; and the induction coil for generating an electromagnetic field with a frequency in a range of 50 kHz to 1 MHz inclusive in the bulb. The core is made of a Mn—Zn polycrystalline ferrite and has a Curie temperature of 270° C. or more.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: November 18, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Toshiaki Kurachi, Koji Miyazaki, Katsushi Seki, Mamoru Takeda
  • Patent number: 6522084
    Abstract: An electrodeless discharge lamp operating apparatus includes a transparent discharge vessel (1) in which a luminescent substance is enclosed; a coil (3) for generating an alternating electromagnetic field that discharges the luminescent substance; a power source (4) for supplying alternating current to the coil (3). The coil (3) comprises at least a magnetic material, and is disposed on an inner side than the outer side wall of the discharge vessel (1), and the luminescent substance comprises at least a rare gas, and does not comprise mercury.
    Type: Grant
    Filed: June 15, 2001
    Date of Patent: February 18, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Koji Miyazaki, Toshiaki Kurachi, Mamoru Takeda, Katsushi Seki, Young-Jae Cho
  • Publication number: 20020158567
    Abstract: A self-ballasted electrodeless discharge lamp includes a discharge vessel having a cavity, an induction coil that is inserted into the cavity, a ballast for supplying power to the induction coil, a case for covering the ballast, and a lamp base provided in the case. The discharge vessel is secured to the case via a holder. A part of the discharge vessel and a first portion of the holder are engaged with each other to constitute a combination structure. A second portion of the holder and a part of the case are engaged with each other to constitute a combination structure.
    Type: Application
    Filed: April 26, 2002
    Publication date: October 31, 2002
    Inventors: Takeshi Arakawa, Mitsuharu Kawasaki, Kiyoshi Hashimotodani, Kenichiro Takahashi, Koji Miyazaki, Katsushi Seki, Toshiaki Kurachi, Kenji Itaya
  • Publication number: 20020036472
    Abstract: The induction coil core used for an induction coil of a discharge lamp, the discharge lamp including: a bulb containing discharge gas inside; and the induction coil for generating an electromagnetic field with a frequency in a range of 50 kHz to 1 MHz inclusive in the bulb. The core is made of a Mn—Zn polycrystalline ferrite and has a Curie temperature of 270° C. or more.
    Type: Application
    Filed: March 2, 2001
    Publication date: March 28, 2002
    Inventors: Toshiaki Kurachi, Koji Miyazaki, Katsushi Seki, Mamoru Takeda
  • Patent number: 6362565
    Abstract: An electrodeless discharge lamp and an electrodeless discharge lamp apparatus which prevent the devitrification are provided, where the devitrification occurs due to the use of, as a luminescent substance, a metal halide, particularly a compound made up of a group IIIB metal and a halogen. The inventors recognize the cause of the devitrification as follows: atoms of the metal are dissociated from the luminescent substance and precipitate on the surface of the arc tube wall to melt it as the luminescent substance is excited and emits light. Based on this recognition, a substance is added to the interior of the arc tube to prevent the melting of the arc tube wall and extend the life of the lamp. More specifically, the added substance is another metal halide which contains a halogen, but the valence of the metal of the added metal halide is larger than that of the luminescent-substance metal halide.
    Type: Grant
    Filed: October 13, 1999
    Date of Patent: March 26, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Koichi Katase, Tsuyoshi Ichibakase, Katsushi Seki
  • Patent number: 6351087
    Abstract: A long life microwave electrodeless discharge lamp apparatus capable of preventing the generation of noise. The microwave electrodeless discharge lamp apparatus includes a magnetron having a magnetron tube and a yoke that surrounds the magnetron tube, a container housing at least the magnetron tube, a waveguide in which microwaves oscillated by the magnetron are propagated, an electrodeless discharge tube sealing luminescent materials excited by the microwaves to emit light, wherein a space surrounded by the yoke is communicated with the inside of the container, and wherein a fluid is sealed in the container. Thus, the magnetron tube is in a state in which it is immersed in the fluid.
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: February 26, 2002
    Assignee: Matsushita Electronics Corporation
    Inventors: Koichi Katase, Tsuyoshi Ichibakase, Katsushi Seki
  • Patent number: 5998934
    Abstract: A microwave-excited discharge lamp apparatus of the present invention has a translucent blow guide 6 arranged around a microwave-excited discharge lamp 4. Thereby, even when the microwave-excited discharge lamp 4 is reduced in size, the microwave-excited discharge lamp 4 can be cooled efficiently without complicating or increasing the size of the apparatus.
    Type: Grant
    Filed: May 4, 1998
    Date of Patent: December 7, 1999
    Assignee: Matsushita Electronics Corporation
    Inventors: Mutsumi Mimasu, Koichi Katase, Katsushi Seki
  • Patent number: D537545
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: February 27, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shiro Iida, Katsushi Seki, Noriyuki Uchida
  • Patent number: D537546
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: February 27, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shiro Iida, Katsushi Seki, Noriyuki Uchida
  • Patent number: D661416
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: June 5, 2012
    Assignee: Panasonic Corporation
    Inventors: Nobuyuki Mase, Yoshitaka Kurimoto, Katsushi Seki, Keisuke Imamura, Yosuke Fujimaki, Masashi Sakata, Nozomu Hashimoto, Masato Matsumoto
  • Patent number: D663449
    Type: Grant
    Filed: June 21, 2011
    Date of Patent: July 10, 2012
    Assignee: Panasonic Corporation
    Inventors: Akihito Wakamiya, Akio Kitada, Yoshinori Kakuno, Katsushi Seki
  • Patent number: D697253
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: January 7, 2014
    Assignee: Panasonic Corporation
    Inventors: Akihito Wakamiya, Akio Kitada, Yoshinori Kakuno, Katsushi Seki
  • Patent number: D702870
    Type: Grant
    Filed: June 21, 2011
    Date of Patent: April 15, 2014
    Assignee: Panasonic Corporation
    Inventors: Akihito Wakamiya, Akio Kitada, Yoshinori Kakuno, Katsushi Seki