Patents by Inventor Etsuo Saitou

Etsuo Saitou 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).

  • Patent number: 9000669
    Abstract: A magnetron includes an anode cylinder which has a cylindrical shape with both ends opened and which includes a plurality of vanes radially provided on an inner wall surface thereof, a pair of pole pieces positioned in openings of the both ends of the anode cylinder, and metal sleeves. The metal sleeves are positioned outside the pair of pole pieces and configured to air-tightly seal the anode cylinder. Each of the metal sleeves includes a cylinder part, a flange part continuous with the cylinder part, and a plurality of protrusions provided on a portion in which the cylinder part continues with the flange part.
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: April 7, 2015
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Nagisa Kuwahara, Etsuo Saitou, Takanori Handa, Takeshi Ishii
  • Patent number: 8723419
    Abstract: A magnetron includes: an anode cylinder including anode vanes provided at a predetermined interval on an inner peripheral surface thereof; a center lead including a first linear portion, a second linear portion disposed parallel to the first linear portion and disposed out of alignment with the first linear portion in a plane perpendicular to an axial direction of the anode cylinder, and a bent portion which connects the first linear portion to the second linear portion; and a cathode filament supported by the center lead within the anode cylinder and placed coaxially with the anode cylinder. The center lead is formed so as to become bent between the first linear portion and the second linear portion by the bent portion. A position of one anode vane closest to the bent portion is higher than a position of another anode vane with respect to the axial direction.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: May 13, 2014
    Assignee: Panasonic Corporation
    Inventors: Etsuo Saitou, Nagisa Kuwahara, Takanori Handa, Takeshi Ishii
  • Patent number: 8723420
    Abstract: A magnetron includes an anode cylinder; a cathode side tube hermetically coupled to a lower portion of the anode cylinder; and a shield cylinder. The shield cylinder includes a cylindrical part extending in substantially a vertical direction, a flange part which is connected to the cylindrical part and extends in substantially a horizontal direction over the entire periphery of the cylindrical part, and a folded part in which a portion of the flange part is folded toward the cathode side tube. The shield cylinder is electrically coupled to the cathode side tube at a lower end of the anode cylinder.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: May 13, 2014
    Assignee: Panasonic Corporation
    Inventors: Takeshi Ishii, Nagisa Kuwahara, Etsuo Saitou
  • Patent number: 8120258
    Abstract: The present invention provides a magnetron which can conduct more magnetic flux in the active space at the periphery of a cathode structure to thereby further improve the efficiency of a magnetic circuit. The magnetron of the present invention includes an anode cylinder on which inner wall a plurality of anode vanes are provided, a pole piece provided on an end side of the anode cylinder, a circular magnet provided on the vicinity of the pole piece, and a magnet ring provided between the anode cylinder and the circular magnet. An outer diameter of the magnet ring is smaller than or equal to the outer diameter of the circular magnet and larger than or equal to the outer diameter of the anode cylinder. The magnet ring has a portion on a surface of the pole piece side whose normal line is non-parallel to the central axis of the anode cylinder.
    Type: Grant
    Filed: February 19, 2009
    Date of Patent: February 21, 2012
    Assignee: Panasonic Corporation
    Inventors: Ayako Kumakura, Nagisa Kuwahara, Etsuo Saitou
  • Publication number: 20110298373
    Abstract: Performance degradation of a magnetron is prevented by preventing a cylinder part of a metal sleeve from sinking in a recess of a pole piece even when subjected to a high pressure in the case of handling or assembly.
    Type: Application
    Filed: December 24, 2009
    Publication date: December 8, 2011
    Applicant: PANASONIC CORPORATION
    Inventors: Nagisa Kuwahara, Etsuo Saitou, Takanori Handa, Takeshi Ishii
  • Publication number: 20110254442
    Abstract: A magnetron for holding deformation of a cathode side tube for alignment of a cathode filament and eliminating the need for alignment at the time of exterior assembly work of the magnetron is provided. The magnetron of the invention includes an anode cylinder; a cathode side tube hermetically coupled to a lower portion of the anode cylinder; and a shield cylinder having a cylindrical part extending in substantially a vertical direction, a flange part which is connected to the cylindrical part and extends in substantially a horizontal direction over the entire periphery of the cylindrical part, and a folded part in which a portion of the flange part is folded toward the cathode side tube, the shield cylinder being electrically coupled to the cathode side tube at a lower end of the anode cylinder.
    Type: Application
    Filed: December 17, 2009
    Publication date: October 20, 2011
    Applicant: PANASONIC CORPORATION
    Inventors: Takeshi Ishii, Nagisa Kuwahara, Etsuo Saitou
  • Publication number: 20110227480
    Abstract: To provide a magnetron capable of suppressing generation of a reactive current and noise thereby improving oscillation efficiency, and a device using microwaves which includes the magnetron. A magnetron of the present invention includes: an anode cylinder including a plurality of anode vanes provided at a predetermined interval on an inner peripheral surface thereof; a center lead including a first linear portion, a second linear portion which is disposed parallel to the first linear portion and which is disposed out of alignment with the first linear portion in a plane perpendicular to an axial direction of the anode cylinder, and a bent portion which connects the first linear portion to the second linear portion; and a cathode filament which is supported by the center lead within the anode cylinder and which is placed coaxially with the anode cylinder. The center lead is formed so as to become bent between the first linear portion and the second linear portion by the bent portion.
    Type: Application
    Filed: November 20, 2009
    Publication date: September 22, 2011
    Applicant: Panasonic Corporation
    Inventors: Etsuo Saitou, Nagisa Kuwahara, Takanori Handa, Takeshi Ishii
  • Patent number: 7919924
    Abstract: In each anode vane 10, there is provided the brazing material spreading prevention groove 13 that interconnects the strap ring inserting portions 11 and 12 in parallel to the direction of the central axis Ax. With such a configuration, it is possible to prevent the residual brazing material 3a from spreading to the front end part 10a of the anode vane 10 when each anode vane 10 is brazed on the inner peripheral surface of the anode cylinder 1. Therefore, non-uniformity in thickness of the anode vanes 10 caused by the residual brazing material 3a is suppressed, and electrostatic capacity between the anode vanes 10 adjacent to each other becomes substantially constant. Thus, it is possible to obtain stable resonant frequency. In addition, it becomes easy to perform adjustment for obtaining the stable resonant frequency in that non-uniformity in initial frequency of the time when the magnetron is completely assembled decreases.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: April 5, 2011
    Assignee: Panasonic Corporation
    Inventors: Etsuo Saitou, Nagisa Kuwahara, Takeshi Ishii
  • Patent number: 7687749
    Abstract: It is an object to provide a magnetron for a small-sized microwave oven which takes safety standards and a noise into consideration, in a magnetron 10 for a microwave oven, a pair of choke coils 16 and 17 are provided in a filter case 11, and a height H1 of the internal surface of the filter case 11 is set to be 35 to 45 mm, an outside diameter d3 of an air-core type inductance 25 is set to be 5.5 to 7.5 mm and a sectional area S of a high frequency absorbing member 27 is set to be 5 to 16 mm2. In the magnetron 10 for a microwave oven, an electrostatic capacity between capacitor terminals 15A and 15B and the filter case 11 is increased to be 500 to 700 pF.
    Type: Grant
    Filed: April 19, 2006
    Date of Patent: March 30, 2010
    Assignee: Panasonic Corporation
    Inventors: Hiroshi Ochiai, Etsuo Saitou, Yoshimasa Suzuki, Nagisa Kuwahara
  • Publication number: 20090218949
    Abstract: The present invention provides a magnetron which can conduct more magnetic flux in the active space at the periphery of a cathode structure to thereby further improve the efficiency of a magnetic circuit. The magnetron of the present invention includes an anode cylinder on which inner wall a plurality of anode vanes are provided, a pole piece provided on an end side of the anode cylinder, a circular magnet provided on the vicinity of the pole piece, and a magnet ring provided between the anode cylinder and the circular magnet. An outer diameter of the magnet ring is smaller than or equal to the outer diameter of the circular magnet and larger than or equal to the outer diameter of the anode cylinder. The magnet ring has a portion on a surface of the pole piece side whose normal line is non-parallel to the central axis of the anode cylinder.
    Type: Application
    Filed: February 19, 2009
    Publication date: September 3, 2009
    Inventors: Ayako KUMAKURA, Nagisa Kuwahara, Etsuo Saitou
  • Publication number: 20090153055
    Abstract: In each anode vane 10, there is provided the brazing material spreading prevention groove 13 that interconnects the strap ring inserting portions 11 and 12 in parallel to the direction of the central axis Ax. With such a configuration, it is possible to prevent the residual brazing material 3a from spreading to the front end part 10a of the anode vane 10 when each anode vane 10 is brazed on the inner peripheral surface of the anode cylinder 1. Therefore, non-uniformity in thickness of the anode vanes 10 caused by the residual brazing material 3a is suppressed, and electrostatic capacity between the anode vanes 10 adjacent to each other becomes substantially constant. Thus, it is possible to obtain stable resonant frequency. In addition, it becomes easy to perform adjustment for obtaining the stable resonant frequency in that non-uniformity in initial frequency of the time when the magnetron is completely assembled decreases.
    Type: Application
    Filed: March 5, 2008
    Publication date: June 18, 2009
    Inventors: Etsuo SAITOU, Nagisa Kuwahara, Takeshi Ishii
  • Patent number: 7148627
    Abstract: A magnetron is configured so that an antenna lead 17 connected to a desired position of an anode segment 2 passes through a magnetic pole piece 7 and a metal cylinder 8 so as not to make contact therewith and is connected to the output portion of the magnetron, and so that the electrical length L1 of this antenna lead 17 between the opening end of a third harmonic restraint choke 15 and the connection portion of the anode segment 2 is 1/2 of the wavelength (?) of the third harmonic, thereby restraining the third harmonic and the side bands of the third harmonic.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: December 12, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takeshi Ishii, Etsuo Saitou, Masanori Yoshihara, Toshiyuki Tsukada, Hideki Ohguri
  • Publication number: 20060238129
    Abstract: It is an object to provide a magnetron for a small-sized microwave oven which takes safety standards and a noise into consideration, in a magnetron 10 for a microwave oven, a pair of choke coils 16 and 17 are provided in a filter case 11, and a height H1 of the internal surface of the filter case 11 is set to be 35 to 45 mm, an outside diameter d3 of an air-core type inductance 25 is set to be 5.5 to 7.5 mm and a sectional area S of a high frequency absorbing member 27 is set to be 5 to 16 mm2. In the magnetron 10 for a microwave oven, an electrostatic capacity between capacitor terminals 15A and 15B and the filter case 11 is increased to be 500 to 700 pF.
    Type: Application
    Filed: April 19, 2006
    Publication date: October 26, 2006
    Inventors: Hiroshi Ochiai, Etsuo Saitou, Yoshimasa Suzuki, Nagisa Kuwahara
  • Patent number: 7053556
    Abstract: In a magnetron 41, when a radius of a flat portion 45b of a pole piece 45 is Rp, a radius of the inner circumference of a large-diameter equalizing ring 51 is Rs2, Rp?Rs2, a radius of the outer circumference of a small-diameter equalizing ring is Rs1, a radius of a circle inscribed in a leading edge of an anode vane is Ra, and a minimum length between the pole pieces in the axial direction is Lg, the values of Ra, Rs1, Rs2, and Lg are set such that the following Expressions 1 and 2 are established: 1.85Ra?(Rs1+Rs2)/2?1.96Ra, and[Expression 1] 2.84Ra?Lg?3.0Ra.
    Type: Grant
    Filed: February 7, 2005
    Date of Patent: May 30, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masanori Yoshihara, Hiroshi Ochiai, Etsuo Saitou, Hideki Ohguri
  • Patent number: 6989634
    Abstract: A magnetron cathode assembly which realizes stopping of turn of an external terminal inserted into a stem insulator without increasing a manufacturing cost. A leading end of a base end axial portion of an external terminal has a non-circular section by providing a flat surface in at least one position on its peripheral surface, and a straight stop edge that fits to the flat surface thereby to carry out stopping of turn of the external terminal is provided for a terminal fitting hole of a sealing metal plate into which the leading end of this external terminal is fitted.
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: January 24, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Etsuo Saitou, Takeshi Ishii, Masanori Yoshihara, Hideki Ohguri, Toshiyuki Tsukada
  • Publication number: 20050174061
    Abstract: In a magnetron 41, when a radius of a flat portion 45b of a pole piece 45 is Rp, a radius of the inner circumference of a large-diameter equalizing ring 51 is Rs2, Rp?Rs2, a radius of the outer circumference of a small-diameter equalizing ring is Rs1, a radius of a circle inscribed in a leading edge of an anode vane is Ra, and a minimum length between the pole pieces in the axial direction is Lg, the values of Ra, Rs1, Rs2, and Lg are set such that the following Expressions 1 and 2 are established: 1.85Ra?(Rs1+Rs2)/2?1.96Ra,??[Expression 1] and 2.84Ra?Lg?3.0Ra.
    Type: Application
    Filed: February 7, 2005
    Publication date: August 11, 2005
    Inventors: Masanori Yoshihara, Hiroshi Ochiai, Etsuo Saitou, Hideki Ohguri
  • Publication number: 20050062427
    Abstract: A magnetron cathode assembly which realizes stopping of turn of an external terminal inserted into a stem insulator without increasing a manufacturing cost. A leading end of a base end axial portion of an external terminal has a non-circular section by providing a flat surface in at least one position on its peripheral surface, and a straight stop edge that fits to the flat surface thereby to carry out stopping of turn of the external terminal is provided for a terminal fitting hole of a sealing metal plate into which the leading end of this external terminal is fitted.
    Type: Application
    Filed: December 30, 2003
    Publication date: March 24, 2005
    Inventors: Etsuo Saitou, Takeshi Ishii, Masanori Yoshihara, Hideki Ohguri, Toshiyuki Tsukada
  • Patent number: 6844680
    Abstract: In such a case that a radial dimension of an outer circumference of a small-diameter strap ring of a magnetron is equal to “Rs1”, a radial dimension of an inner circumference of a large-diameter strap ring is equal to “Rs2”, a radius of a circumference which is inscribed to tip portions of anode vanes is equal to “Ra”, and a radius of a central flat portion of a magnetic piece, which is located in the vicinity of each of the anode vanes, is equal to “Rp”, the respective values of Ra, Rs1, Rs2, Rp are set in such a manner that the below-mentioned formulae (1) and (2) can be established: 1.85Ra?(Rs1+Rs2)/2?1.96Ra??(1) Rs1<Rp<Rs2??(2).
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: January 18, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masanori Yoshihara, Toshiyuki Tsukada, Hideki Ohguri, Etsuo Saitou, Takeshi Isii
  • Publication number: 20040021422
    Abstract: A magnetron in accordance with the present invention is configured so that an antenna lead 17 connected to a desired position of an anode segment 2 passes through a magnetic pole piece 7 and a metal cylinder 8 so as not to make contact therewith and is connected to the output portion of the magnetron, and so that the electrical length L1 of this antenna lead 17 between the opening end of a third harmonic restraint choke 15 and the connection portion of the anode segment 2 is 1/2 of the wavelength (&lgr;) of the third harmonic, thereby restraining the third harmonic and the side bands of the third harmonic.
    Type: Application
    Filed: June 23, 2003
    Publication date: February 5, 2004
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takeshi Ishii, Etsuo Saitou, Masanori Yoshihara, Toshiyuki Tsukada, Hideki Ohguri
  • Publication number: 20040012349
    Abstract: In such a case that a radial dimension of an outer circumference of a small-diameter strap ring of a magnetron is equal to “Rs1”, a radial dimension of an inner circumference of a large-diameter strap ring is equal to “Rs2”, a radius of a circumference which is inscribed to tip portions of anode vanes is equal to “Ra”, and a radius of a central flat portion of a magnetic piece, which is located in the vicinity of each of the anode vanes, is equal to “Rp”, the respective values of Ra, Rs1, Rs2, Rp are set in such a manner that the below-mentioned formulae (1) and (2) can be established:
    Type: Application
    Filed: July 16, 2003
    Publication date: January 22, 2004
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masanori Yoshihara, Toshiyuki Tsukada, Hideki Ohguri, Etsuo Saitou, Takeshi Isii