Patents by Inventor Masayoshi Sakai

Masayoshi Sakai 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: 20190165607
    Abstract: A high frequency oscillator has a high frequency generation part, an oscillation part, a matching unit, rectification element parts and switch parts. The oscillation part oscillates high frequency power generated by the high frequency generation part. The matching unit is arranged between the high frequency generation part and the oscillation part, and has one or more capacitors and matching circuits having difference characteristics so as to perform matching between the high frequency generation part and the oscillation part. The rectification element parts and the matching circuits are arranged in one-to-one correspondence. The rectification element parts rectify high frequency power supplied from the high frequency generation part to the oscillation part. The switch part is connected to the corresponding rectification element part to switch the corresponding capacitor connected to the corresponding matching circuit through the corresponding rectification element part.
    Type: Application
    Filed: November 21, 2018
    Publication date: May 30, 2019
    Inventors: Masayoshi SUGINO, Takashi OHIRA, Naoki SAKAI, Satoshi KITABAYASHI, Shinji ABE
  • Patent number: 7443342
    Abstract: The invention provides a reception time determining apparatus which can measure reception time to a high accuracy, without expanding an occupied bandwidth, and a distance measuring apparatus which uses the reception time determining apparatus.
    Type: Grant
    Filed: July 13, 2006
    Date of Patent: October 28, 2008
    Assignee: The Nippon Signal Co., Ltd.
    Inventors: Toshihito Shirai, Takaharu Ishige, Masayoshi Sakai, Wakana Sannomiya
  • Patent number: 7245224
    Abstract: Projection device failure may be diagnosed by sensing improper operation of projection lamp ignitor circuitry. An ignitor failure indicator may be activated based on a sensed failure in the operation of the lamp ignitor circuitry to prevent incorrect projection lamp failure notification.
    Type: Grant
    Filed: October 28, 2004
    Date of Patent: July 17, 2007
    Assignee: Dell Products LP
    Inventors: Subramanian Jayaram, Satchidananda Mishra, Masayoshi Sakai
  • Patent number: 7197932
    Abstract: The present invention relates to a failure detecting system that enables the detection of a break in a rail and the like by a simple network configuration. Detecting units (20 and 50), relay units (30A, 30B, 60A through 60C) and terminal units (40 and 70) are arranged along rails (11, 11A and 11B). Using the rails (11, 11A and 11B) as transmission media, ultrasonic waves transmitted from the detecting units (20 and 50) are transmitted to the terminal units (40 and 70) by the relay units (30A, 30B, 60A through 60C), and when the terminal units (40 and 70) receive the ultrasonic waves, the ultrasonic waves are returned from the terminal units (40 and 70), relayed by the relay units (30A, 30B, 60A through 60C), and transmitted to the detecting units (20 and 50). Thus, it is judged whether there is a break in the rails (11, 11A and 11B), based on the ultrasonic wave reception state in the detecting units (20 and 50).
    Type: Grant
    Filed: September 4, 2000
    Date of Patent: April 3, 2007
    Assignee: The Nippon Signal Co, Ltd.
    Inventors: Masayoshi Sakai, Toshihito Shirai, Akira Morisada
  • Publication number: 20070002932
    Abstract: The invention provides a reception time determining apparatus which can measure reception time to a high accuracy, without expanding an occupied bandwidth, and a distance measuring apparatus which uses the reception time determining apparatus.
    Type: Application
    Filed: July 13, 2006
    Publication date: January 4, 2007
    Inventors: Toshihito Shirai, Takaharu Ishige, Masayoshi Sakai, Wakana Sannomiya
  • Publication number: 20060033633
    Abstract: Projection device failure may be diagnosed by sensing improper operation of projection lamp ignitor circuitry. An ignitor failure indicator may be activated based on a sensed failure in the operation of the lamp ignitor circuitry to prevent incorrect projection lamp failure notification.
    Type: Application
    Filed: October 28, 2004
    Publication date: February 16, 2006
    Inventors: Subramanian Jayaram, Satchidananda Mishra, Masayoshi Sakai
  • Publication number: 20060010979
    Abstract: The present invention relates to a failure detecting system that enables the detection of a break in a rail and the like by a simple network configuration. Detecting units (20 and 50), relay units (30A, 30B, 60A through 60C) and terminal units (40 and 70) are arranged along rails (11, 11A and 11B). Using the rails (11, 11A and 11B) as transmission media, ultrasonic waves transmitted from the detecting units (20 and 50) are transmitted to the terminal units (40 and 70) by the relay units (30A, 30B, 60A through 60C), and when the terminal units (40 and 70) receive the ultrasonic waves, the ultrasonic waves are returned from the terminal units (40 and 70), relayed by the relay units (30A, 30B, 60A through 60C), and transmitted to the detecting units (20 and 50). Thus, it is judged whether there is a break in the rails (11, 11A and 11B), based on the ultrasonic wave reception state in the detecting units (20 and 50).
    Type: Application
    Filed: April 30, 2002
    Publication date: January 19, 2006
    Applicant: The Nippon Signal Co., Ltd.
    Inventors: Masayoshi Sakai, Toshihito Shirai, Akira Morisada
  • Patent number: 6459656
    Abstract: The present invention relates to an information generating apparatus for transmitting and receiving elastic waves through a rail for a train. The information generating apparatus comprises elastic wave transmitting means for transmitting elastic waves to said rail, elastic wave receiving means for receiving elastic waves transmitted from said elastic wave transmitting means through said rail, and information generating means for generating information that is necessary for controlling/monitoring associated elements of a control system for performing control operations on said train, based on an elastic wave reception signal received by said elastic wave receiving means. The information generating means has detection means for detecting presence/absence of said train in said rail, based on a reception condition of an elastic wave received by said elastic wave receiving means and for generating information representing presence/absence of said train in said rail.
    Type: Grant
    Filed: July 31, 2001
    Date of Patent: October 1, 2002
    Assignee: The Nippon Signal Co., Ltd.
    Inventors: Koichi Futsuhara, Masayoshi Sakai, Toshihito Shirai, Akira Morisada, Hitoshi Nozawa, Katsuichi Inose
  • Patent number: 6434025
    Abstract: The invention relates to a power supply unit which can fail-safely monitor not only for an excessive power supply output but also for an abnormal drop in output level. At the time of start-up, with the start signal from a start circuit, an AC signal is supplied to a primary side of a transformer and based on an AC output from a secondary side of the transformer, an output for supplying to an external load is generated and this output is monitored with a monitoring circuit. If the output level is within a set upper and lower limit threshold value range the output is judged to be normal and a high level normal verification signal is generated from the monitoring circuit, and with the high level normal verification signal, an AC signal is supplied to the primary side of the transformer, and the output supply to the external load is continued.
    Type: Grant
    Filed: October 8, 1999
    Date of Patent: August 13, 2002
    Assignee: The Nippon Signal Co., Ltd.
    Inventors: Toshihito Shirai, Masayoshi Sakai, Koichi Futsuhara, Takayuki Yuasa
  • Patent number: 6392451
    Abstract: The invention relates to a threshold value operation circuit which can perform an analogue type threshold value operation, and which can generate an AC signal with a stabilized frequency and duty ratio which is not influenced by input signal level or characteristic changes of the circuit elements and the like. A switching device (SWa) is switched by a switching signal (Sg) from an external AC source, to modulate an input signal (Vi) which is the subject of a threshold value operation. A modulation signal (V1) thereof is level detected by a level detection circuit (10) having a previously set threshold value, and if within a range of a predetermined level, an AC output (Vo) is generated from the level detection circuit (10).
    Type: Grant
    Filed: May 1, 2000
    Date of Patent: May 21, 2002
    Assignee: The Nippon Signal Co., Ltd.
    Inventors: Masayoshi Sakai, Toshihito Shirai
  • Publication number: 20020027831
    Abstract: The present invention relates to an information generating apparatus for transmitting and receiving elastic waves through a transmission medium and for generating information which is necessary for controlling/monitoring associated elements of a control system.
    Type: Application
    Filed: July 31, 2001
    Publication date: March 7, 2002
    Applicant: Nippon Signal Co., Ltd.
    Inventors: Koichi Futsuhara, Masayoshi Sakai, Toshihito Shirai, Akira Morisada, Hitoshi Nozawa, Katsuichi Inose
  • Publication number: 20020006045
    Abstract: The invention relates to a power supply unit which can fail-safely monitor not only for an excessive power supply output but also for an abnormal drop in output level. At the time of start-up, with the start signal from a start circuit, an AC signal is supplied to a primary side of a transformer and based on an AC output from a secondary side of the transformer, an output for supplying to an external load is generated and this output is monitored with a monitoring circuit. If the output level is within a set upper and lower limit threshold value range the output is judged to be normal and a high level normal verification signal is generated from the monitoring circuit, and with the high level normal verification signal, an AC signal is supplied to the primary side of the transformer, and the output supply to the external load is continued.
    Type: Application
    Filed: October 8, 1999
    Publication date: January 17, 2002
    Inventors: TOSHIHITO SHIRAI, MASAYOSHI SAKAI, KOICHI FUTSUHARA, TAKAYUKI YUASA
  • Patent number: 6334077
    Abstract: The present invention provides an operation apparatus for a press, of simple structure with lower cost.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: December 25, 2001
    Assignee: The Nippon Signal Co., Ltd.
    Inventors: Koichi Futsuhara, Masayoshi Sakai, Iwashige Takahashi, Yukio Hata
  • Patent number: 6292524
    Abstract: A counting apparatus having excellent fail-safe characteristics can be used in a rotation-stopped detection apparatus. As a first feature, timing of a high-frequency signal P2 is carried out by a counter 1 after completion of a counting of pulse signals P1. When the frequency of the timing output for the high-frequency signal is a predetermined value, a judgment signal, indicating that the counting is normal, is generated by a frequency discriminating circuit 30. As a second feature, a counter 100 is preset using a preset signal. Then, after verifying by an output from a self hold circuit 102 that the counter 100 has been reset, a counting output is generated from a self hold circuit 104. As a third feature, the counting apparatus is used as timer circuits 203, 300, 400, and the generation frequency of a rotation detection pulse signal IP based on a sensor signal, is obtained to thereby detect a rotation-stopped condition of a rotating body.
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: September 18, 2001
    Assignee: The Nippon Signal Co., Ltd.
    Inventors: Masayoshi Sakai, Koichi Futsuhara
  • Patent number: 6292432
    Abstract: The present invention relates to an information generating apparatus for transmitting and receiving elastic waves through a rail for a train. The information generating apparatus comprises elastic wave transmitting means for transmitting elastic waves to said rail, elastic wave receiving means for receiving elastic waves transmitted from said elastic wave transmitting means through said rail, and information generating means for generating information that is necessary for controlling/monitoring associated elements of a control system for performing control operations on said train, based on an elastic wave reception signal received by said elastic wave receiving means. The information generating means has judgment means for making a judgment on presence/absence of rupture in said rail, based on a reception condition of an elastic wave received by said elastic wave receiving means compared with a predetermined condition and for generating information representing presence/absence of rupture in said rail.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: September 18, 2001
    Assignee: The Nippon Signal Co., Ltd.
    Inventors: Koichi Futsuhara, Masayoshi Sakai, Toshihito Shirai, Akira Morisada, Hitoshi Nozawa, Katsuichi Inose
  • Publication number: 20010012563
    Abstract: A silver-plated laminated body which is highly durable and can easily be manufactured has an undercoat layer, a silver-plated layer, a lower topcoat layer, and an upper topcoat layer which are successively disposed in the order named on a base of plastics. The undercoat layer comprises a coating film which is mainly made of an alkyd resin that is free of a catalyst. The silver-plated layer is formed by a silver mirror reaction. The lower topcoat layer comprises a coating film which is mainly made of polyester polyol. The upper topcoat layer comprises a coating film which is mainly made of polyester polyol containing a di-isocyanate compound as a hardener. The lower topcoat layer contains a colorant.
    Type: Application
    Filed: November 29, 2000
    Publication date: August 9, 2001
    Inventor: Masayoshi Sakai
  • Patent number: 6148055
    Abstract: A counting apparatus having excellent fail-safe characteristics can be used in a rotation-stopped detection apparatus. As a first feature, timing of a high-frequency signal P.sub.2 is carried out by a counter 1 after completion of a counting of pulse signals P.sub.1. When the frequency of the timing output for the high-frequency signal is a predetermined value, a judgment signal, indicating that the counting is normal, is generated by a frequency discriminating circuit 30. As a second feature, a counter 100 is preset using a preset signal. Then, after verifying by an output from a self hold circuit 102 that the counter 100 has been reset, a counting output is generated from a self hold circuit 104. As a third feature, the counting apparatus is used as timer circuits 203, 300, 400, and the generation frequency of a rotation detection pulse signal I.sub.P based on a sensor signal, is obtained to thereby detect a rotation-stopped condition of a rotating body.
    Type: Grant
    Filed: June 19, 1997
    Date of Patent: November 14, 2000
    Assignee: The Nippon Signal Co., Ltd.
    Inventors: Masayoshi Sakai, Koichi Futsuhara
  • Patent number: 6047634
    Abstract: The present invention relates to a fail-safe automatic sliding operation control apparatus for a press. The entrance and withdrawal behaviors of an operator's hand relative to danger zones (D, D.sub.N) on a bolster of the press are detected by an output generation configuration of two optical curtains. A signal for permitting a lowering operation of the slide is generated when the operator's hand is withdrawn from the danger zones (D, D.sub.N).
    Type: Grant
    Filed: July 17, 1998
    Date of Patent: April 11, 2000
    Assignee: The Nippon Signal Co., Ltd.
    Inventors: Koichi Futsuhara, Toshihito Shirai, Masayoshi Sakai
  • Patent number: 6034449
    Abstract: The invention relates to a load drive circuit wherein an emergency shutdown switch for forcible interruption and a normal shutdown switch for normal current control are disposed in series in a load power supply circuit. An emergency shutdown switch (SW.sub.A) and a normal shutdown switch (SW.sub.B) are disposed in series in a load power supply circuit. The normal shutdown switch (SW.sub.B) is periodically driven off for a short time by means of a control signal (X) from a normal shutdown switch control circuit (30), and the fact that this is off is monitored by an output signal (AC) from a monitoring circuit (40). If the output signal (AC) is not generated for an off-delay time or more of an off-delay circuit (21), then a control signal (Z) for an emergency shutdown switch control circuit (20) is stopped thereby forcibly switching off the emergency shutdown switch (SW.sub.A).
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: March 7, 2000
    Assignee: The Nippon Signal Co., Ltd.
    Inventors: Masayoshi Sakai, Koichi Futsuhara
  • Patent number: 6031790
    Abstract: The present invention relates to an information generating apparatus for transmitting and receiving elastic waves through a transmission medium and for generating information which is necessary for controlling/monitoring associated elements of a control system.Elastic waves are transmitted and received by using the movement path (2, 111, 112, 211, 211') of a mobile unit (1, 151, 213) as a transmission medium. Based on a change in the level of a received elastic wave or on reception conditions, such as propagation time, of elastic waves, information on the timing of starting a sounding operation in a railroad crossing, information on the presence/absence of a mobile unit on a movement path, information on the presence/absence of rupture in a movement path or information for automatically controlling a train is generated.
    Type: Grant
    Filed: October 1, 1998
    Date of Patent: February 29, 2000
    Assignee: The Nippon Signal Co. Ltd.
    Inventors: Koichi Futsuhara, Masayoshi Sakai, Toshihito Shirai, Akira Morisada, Hitoshi Nozawa, Katsuichi Inose