Patents Assigned to Tokyo Keiki Co., Ltd.
  • Patent number: 10772184
    Abstract: An ignition device ignites a mixture of air and fuel gas by plasma to generate an initial flame. The ignition device includes a spark plug having an inner conductor, a cylindrical outer conductor that holds the inner conductor inside, and a dielectric provided between the inner conductor and the outer conductor, and the spark plug configured to emit an electromagnetic wave to a plasma formation space between the inner conductor and the outer conductor to generate a plasma. The ignition device includes an electromagnetic wave power supply that generates the electromagnetic wave by inputting the electromagnetic wave power Ps to the spark plug and a power supply control unit that controls the electromagnetic wave power supply. The electromagnetic wave power supply is configured to generate high frequency power at a number of different frequencies.
    Type: Grant
    Filed: September 10, 2019
    Date of Patent: September 8, 2020
    Assignees: DENSO CORPORATION, PLASMA APPLICATIONS CO., LTD., TOKYO KEIKI INC.
    Inventors: Daisuke Tanaka, Fumiaki Aoki, Akimitsu Sugiura, Masashi Kando, Jan Husarik, Hiroshi Okajima
  • Patent number: 5334984
    Abstract: A direction finding method and system for locating the direction of a transmission source based on an electromagnetic wave which is transmitted from the transmission source and is received by an antenna means at a receiving end apparatus. The transmission source transmits an angle-modulated wave. Meanwhile, the receiving end apparatus receives the transmitted wave, converts into electrical signals a beat frequency signal which is caused by direct and reflected waves contained in the received wave, and time-averaging the electrical signals, thus minimizing a angle error due to a multipass interference.
    Type: Grant
    Filed: July 28, 1992
    Date of Patent: August 2, 1994
    Assignee: Tokyo Keiki Co., Ltd.
    Inventor: Noriyuki Akaba
  • Patent number: 5231997
    Abstract: A heating apparatus for hyperthermia utilizes electromagnetic waves for locally heating cancerous cells within a living body. Electromagnetic waves output from a single electromagnetic wave generating means are branched into a plurality of branched electromagnetic waves, which are respectively employed to conduct hyperthermia treatments for a plurality of patients. The whole of the hyperthermia system is controlled in a concentrated fashion from a single section by means of time-division multiplexing. It is therefore possible for a plurality of patients to be subjected to hyperthermia treatment at the same time and in parallel with each other, even when the conditions of these patients differ from one another. Further, it is advantageously possible to simplify the arrangement of the system as a whole and stabilize the control of the system.
    Type: Grant
    Filed: February 28, 1991
    Date of Patent: August 3, 1993
    Assignees: Tokyo Keiki Co., Ltd., Makoto Kikuchi, Shinsaku Mori, Yoshio Nikawa
    Inventors: Makoto Kikuchi, Shinsaku Mori, Yoshio Nikawa, Takashige Terakawa
  • Patent number: 5148814
    Abstract: A heating apparatus for hyperthermia utilizes electromagnetic waves for locally heating cancerous cells within a living body. When it is necessary for a plurality of patients to be subjected to hyperthermia treatment at the same time and in parallel with each other, the control of a plurality of electromagnetic wave outputs and the control of cooling of the surface of a heated region are effected by a centralized control which employs time-division multiplexing. Thus, it is advantageously possible to efficiently carry out a hyperthermia treatment which is fitting for the condition of each of a plurality of patients.
    Type: Grant
    Filed: January 4, 1991
    Date of Patent: September 22, 1992
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Makoto Kikuchi, Shinsaku Mori, Yoshio Nikawa, Takashige Terakawa
  • Patent number: 5109693
    Abstract: A pair of torquer magnets each comprising a cup-shaped yoke is provided with a disk-like permanent magnet and a pole piece. A through-hole provided through the center of the torquer magnet and a spool member made of a magnetic compensating metal is inserted into and fixed in the through-hole. The spool is shaped to have a central portion intermediate its end of a substantially smaller diameter.
    Type: Grant
    Filed: May 18, 1990
    Date of Patent: May 5, 1992
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Takeshi Hojo, Michio Fukano, Mitsuru Kato
  • Patent number: 5065162
    Abstract: The present invention pertains to a radiowave relay station in which image information or the like is transmitted by a helicopter from a first station to a second station. A direction finding device is provided which detects the direction of a transmitting source, i.e., a first station. The direction finding device calculates the vertical directional angle .phi. representing the direction of an incoming radiowave which is transmitted from the first station. This direction finding device allows the helicopter performing a relay function to fly rapidly to a contact point with the first station, i.e., in a vicinity of the first station. The direction finding device may also provide information to control an antenna driving portion for adjusting a receiving antenna located on the helicopter.
    Type: Grant
    Filed: June 6, 1990
    Date of Patent: November 12, 1991
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Noriyuki Akaba, Hiroshi Yagi, Yoji Miyoshi
  • Patent number: 5053582
    Abstract: A magnetic wave shield tape comprises a strip-shaped conductive member and a strip-shaped insulative member, the strip-shaped magnetic member being fixed to and overlapping the strip-shaped insulative member in the width direction.
    Type: Grant
    Filed: May 25, 1990
    Date of Patent: October 1, 1991
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Takashige Terakawa, Wataru Kusakabe, Yoshihisa Hiraoka, Toshihisa Sugiyama
  • Patent number: 5033478
    Abstract: A heating apparatus for hyperthermia utilizes electromagnetic waves for locally heating cancerous cells within a living body. When it is necessary for a plurality of patients to be subjected to hyperthermia treatment at the same time and in parallel with each other, the control of a plurality of electromagentic wave outputs and the control of cooling of the surface of a heated region are effected by a centralized control which employs time-division multiplexing. Thus, it is advantageously possible to efficiently carry out a hyperthermia treatment which is fitting for the condition of each of a plurality of patients.
    Type: Grant
    Filed: April 10, 1989
    Date of Patent: July 23, 1991
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Makoto Kikuchi, Shinsaku Mori, Yoshio Nikawa, Takashige Terakawa
  • Patent number: 5025810
    Abstract: A heating apparatus for hyperthermia utilizes electromagnetic waves for locally heating cancerous cells within a living body. Electromagnetic waves output from a single electromagnetic wave generating means are branched into a plurality of branched electromagnetic waves, which are respectively employed to conduct hyperthermia treatments for a plurality of patients. The whole of the hyperthermia system is controlled in a concentrated fashion from a single section by means of time-division multiplexing. It is therefore possible for a plurality of patients to be subjected to hyperthermia treatment at the same time and in parallel with each other, even when the conditions of these patients differ from one another. Further, it is advantageously possible to simplify the arrangement of the system as a whole and stabilize the control of the system.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: June 25, 1991
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Makoto Kikuchi, Shinsaku Mori, Yoshio Nikawa, Takashige Terakawa
  • Patent number: 5027130
    Abstract: A radome includes a radome member formed of a dielectric to protect an antenna element from outside space and a structural member formed of metal for supporting the antenna element at the center thereof and to which the radome member is joined at the periphery of the antenna element to support the radome member. When the radome member is formed of dielectric and the structural member is formed of metal, the junction therebetween serves as a kind of antenna and the radiation characteristic of the ordinary antenna element is disturbed. To solve this problem, a portion of the radome member through which an electric wave is transmitted is formed of material through which an electromagnetic wave having a frequency identical with that of the electric wave is transmitted and a junction formed between the radome member and the structural member has a structure for absorbing the electric wave.
    Type: Grant
    Filed: April 25, 1990
    Date of Patent: June 25, 1991
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Noriyuki Akaba, Satoshi Itoh
  • Patent number: 5026959
    Abstract: This invention relates to a microwave radiator for warming therapy inserted into a human body to cure focuses of the body such as tumors. It has a first and second high-frequency coaxial cable. The second high-frequency coaxial cable has an inner conductor and a plurality of ring conductors disposed at the outer periphery of the inner conductor via a dielectric. The second high-frequency coaxial cable is inserted into the focuses of the body, and warming therapy can be conducted using radiated electromagnetic waves.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: June 25, 1991
    Assignee: Tokyo Keiki Co. Ltd.
    Inventors: Koichi Ito, Motomu Matsunaga, Satoru Kurokawa, Koji Ueno
  • Patent number: 5017045
    Abstract: Directional control of a shield excavator is automatically carried out merely by inputting a direction of rotational moment to which the excavator is directed and a magnitude of the moment.
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: May 21, 1991
    Assignees: Sato Kogyo Co., Ltd., Ishikawajima Harima Jukogyo Kabushiki Kaisha, Tokyo Keiki Co., Ltd.
    Inventors: Yoshiharu Kiritani, Yutaka Onishi, Shigeyoshi Tagata, Koichi Umeno
  • Patent number: 5009103
    Abstract: An ultrasonic thickness measuring method and apparatus in which an ultrasonic pulse is transmitted from a probe to a material to be measured and resulting multiple reflection pulses from the material to be measured are detected to obtain a time interval between the reflection pulses for measuring the thickness of the material. This method and apparatus features, for example, comprises counting a time from transmission of the ultrasonic pulse to reception of a first reflection pulse from a bottom of the material to be measured; detecting a pulse received within a preset period of time after said first reflection pulse has been received and just before a time corresponding to the counted time has passed, as a second reflection pulse; and counting a time between the reception of the first reflection pulse and the reception of the second reflection pulse to measure the thickness of the material.
    Type: Grant
    Filed: January 31, 1989
    Date of Patent: April 23, 1991
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Izumi Sato, Koji Saito, Takashi Inoue
  • Patent number: 5008486
    Abstract: An improved electromagnetic wave shielding panel and wall structure includes a plate member of electrically nonconductive material and an electrically conductive foil applied to at least one surface thereof, with an electrically conductive net laid on the electrically conductive foil with its fringe portion extending beyond the edge of the plate member. The use of an electrically conductive net which extends beyond the edge of the plate member, facilitates electrical connection at the joint between adjacent panels and enhances electromagnetic shielding at both low and high impedance levels. Necessary electrical connections can be made simply by abutting the adjacent side surfaces of the panels against each other with their net fringe portions sandwiched therebetween.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: April 16, 1991
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Takashige Terakawa, Wataru Kusakabe
  • Patent number: 4965503
    Abstract: A positional information generating apparatus comprises a code disposed on a main track on which M-sequence codes form a cyclic code of different code words, and sensors disposed for attaining relative movement with reference to a direction of the main track. The code word is detected from the main track by the sensors for generating positional information. A sensor array for the main track in which a greater number of sensors than the number of elements of a code word are disposed over a span corresponding to a length of one code word in such a way that at least one sensor is located on each code element to define a code word to be read. A relative position detector is provided for detecting a relative positional relationship between the sensor array for the main track and the main track.
    Type: Grant
    Filed: March 23, 1989
    Date of Patent: October 23, 1990
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Tsuneo Watanabe, Kouzou Okada
  • Patent number: 4937795
    Abstract: An access alarming method and apparatus for activating an alarm in the event of the access of a working vehicle, such as a road roller, to an object, such as a worker, in the same working area as the vehicle. An ultrasonic wave transmitted by a transmitter on the object is received by a receiver on the vehicle. The received signal is processed and used to determine the relative position of the vehicle with respect to the object. An alarm is activated, and/or the vehicle is braked when it is judged that the object is within a hazard area determined in relation to the position and course of the vehicle.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: June 26, 1990
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Ryohei Motegi, Yoichi Hirokawa, Yukio Yoshida, Junichi Furuki, Tetsuya Ishii, Isao Takiguchi, Hiroshi Kono, Takehiko Suyama, Tomohiro Gocho, Satohiko Tanaka, Narimasa Yamabe, Yoshimitsu Hashimoto
  • Patent number: 4930358
    Abstract: The present invention relates to a method of and an apparatus for measuring flow velocity by using ultrasonic waves. Sound velocities of wedge portions constituting ultrasonic transducers provided at the upstream and the downstream sides of a piping, respectively, are measured, and the ultrasonic wave is oscillated from the upstream side to the downstream side and from the downstream side to the upstream side, respectively, and propagated in a fluid in the piping and respective times from the oscillating to receiving are measured. These measured values are substituted into a predetermined function and calculated, to thereby search the flow velocity of the fluid in the piping.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: June 5, 1990
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Ryohei Motegi, Shinichi Takeuchi, Toshio Sato
  • Patent number: 4924171
    Abstract: Between two units which are separately arranged, a power source signal is supplied from one of the two units to the other unit via electromagnetic induction coupling by using induction coils, and data signals are mutually transmitted and received between both of the units. A change in coupling distance between the induction coils provided for the two units is detected from a signal level of a reception signal from the unit which receives the power supply. When the reception signal level decreases, the signal level of the power supply signal is increased.
    Type: Grant
    Filed: October 7, 1988
    Date of Patent: May 8, 1990
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Fujio Baba, Kunihiko Takeuchi, Shinichi Horinouchi
  • Patent number: 4922752
    Abstract: A flatness integrating/recording apparatus of the present invention includes a car than can travel on a road surface, a device associated with the wheel of the car for calculating the travelled distance of the car, and an optical road surface irregularities measuring device provided on the car. The data obtained from these devices is processed by first and second signal processing portions so as to calculate the travelled distance and the irregularities of the road surface. The data output from the first and second signal processing portions is supplied to a display device and to a data storage portion. A set value inputting device for setting measuring conditions is provided in the tractor portion of the car. The output of the set value inputting device is supplied to the second signal processing portion.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: May 8, 1990
    Assignee: Tokyo Keiki Co., Ltd.
    Inventors: Masahiro Kitazume, Makoto Aoki, Hiroshi Nogi, Kazuya Homma, Shigemi Matsuzawa
  • Patent number: 4896964
    Abstract: A system for measuring irregularities of a road surface, wherein laser rays irradiated on the road surface are received and processed in a predetermined manner. This system includes a body frame mounted on the road surface, a movable frame movably supported by this body frame, and a laser ray transmitting-receiving section connected to this movable frame. The laser ray transmitting-receiving section is additionally provided thereon with a signal process circuit, by which received signals are processed in a predetermined manner, whereby the irregularities of the road surface are measured. Processing performed in the signal process circuit is controlled in timing in accordance with a moving speed of the laser ray transmitting-receiving section.
    Type: Grant
    Filed: October 1, 1987
    Date of Patent: January 30, 1990
    Assignee: Tokyo Keiki Co., Ltd.
    Inventor: Masahiro Kitazume