Patents by Inventor Hideyuki Matsuura

Hideyuki Matsuura 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: 20030146797
    Abstract: An oscillator controller which optimizes key circuit parameters of an excitation circuit according to the operating condition of a discharge lamp. An excitation circuit energizes a discharge lamp to produce a light beam for pumping atoms, as part of a mechanism of atomic resonance detection. The operation of the excitation circuit is monitored by a start-up voltage monitor, which asserts a voltage monitoring signal when the excitation circuit's start-up voltage is reached. A light amount monitor receives a resonance detection signal from a light sensing device to check the amount of light before and after the discharge lamp lights up. The resultant light amount monitoring signal indicates this information. Based on the two monitoring signals, a bias voltage selector selects an appropriate bias voltage that varies circuit parameters of the excitation circuit.
    Type: Application
    Filed: December 10, 2002
    Publication date: August 7, 2003
    Inventors: Ken Atsumi, Hideyuki Matsuura, Yoshifumi Nakajima, Yoshito Koyama
  • Publication number: 20030146796
    Abstract: In an atomic oscillator of an optical pumping system, a slot line resonator, as a microwave resonator, is arranged in a portion where atoms are excited. The slot line resonator forms a microstrip line inputting microwaves so as to be orthogonal to a slot line with a dielectric substrate being sandwiched therebetween. A container in which the atoms are enclosed is mounted on the slot line resonator, and the slot line resonator and the container are covered with a metallic case having a pumping light passage hole and a photo element.
    Type: Application
    Filed: September 27, 2002
    Publication date: August 7, 2003
    Inventors: Hideyuki Matsuura, Ken Atsumi, Yoshito Koyama, Minoru Sakai
  • Patent number: 6570455
    Abstract: A rubidium atom oscillator is not influenced by a circumference noise or the like, and is excellent in the short-term stability and the phase noise characteristic. A crystal oscillator oscillates a fixed frequency as an atomic resonance frequency. A direct digital synthesizer inputs an output of the crystal oscillator as a system clock and also inputs tuned data corresponding to an error signal generated according to a resonance frequency so as to carry out a variable control of an output frequency. A frequency synthesizer synthesizes and multiplies an output of the direct digital synthesizer and applies a phase modulation with a low-frequency signal. An atomic resonator inputs an output of the frequency synthesizer and detects an error signal with respect to a resonance frequency of rubidium atoms. A tuned-data generating circuit inputs the error signal from the atomic resonator so as to generate the tuned data corresponding to the error signal.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: May 27, 2003
    Assignee: Fujitsu Limited
    Inventors: Ken Atsumi, Hideyuki Matsuura, Yoshifumi Nakajima, Yoshito Koyama
  • Publication number: 20020125959
    Abstract: A rubidium atom oscillator is not influenced by a circumference noise or the like, and is excellent in the short-term stability and the phase noise characteristic. A crystal oscillator oscillates a fixed frequency as an atomic resonance frequency. A direct digital synthesizer inputs an output of the crystal oscillator as a system clock and also inputs tuned data corresponding to an error signal generated according to a resonance frequency so as to carry out a variable control of an output frequency. A frequency synthesizer synthesizes and multiplies an output of the direct digital synthesizer and applies a phase modulation with a low-frequency signal. An atomic resonator inputs an output of the frequency synthesizer and detects an error signal with respect to a resonance frequency of rubidium atoms. A tuned-data generating circuit inputs the error signal from the atomic resonator so as to generate the tuned data corresponding to the error signal.
    Type: Application
    Filed: September 27, 2001
    Publication date: September 12, 2002
    Inventors: Ken Atsumi, Hideyuki Matsuura, Yoshifumi Nakajima, Yoshito Koyama
  • Publication number: 20010035795
    Abstract: A rubidium atom oscillator of a gas cell resonator type includes a cavity resonator having a gas cell in which rubidium gas is enclosed, and a dielectric material member that has thermal conductivity and closely contacts an inner wall of the cavity resonator parallel to an optical axis of an incident light emitted from a pumping source. The gas cell is inserted into the dielectric material member having the thermal conductivity along the optical axis.
    Type: Application
    Filed: March 27, 2001
    Publication date: November 1, 2001
    Inventors: Hideyuki Matsuura, Ken Atsumi, Makiko Sugawara, Yoshito Koyama, Koji Nakamuta
  • Patent number: 6300841
    Abstract: In an atomic oscillator, a high-frequency converting circuit converts the output of a standard oscillator into a high frequency signal such that the frequency of the high frequency signal multiplied by a low natural number equals an atomic resonant frequency signal. The high frequency signal is then multiplied by a low natural number in an active, low-natural-number multiplier circuit to convert the output frequency of the standard oscillator into a resonant frequency to be input to the atomic oscillator. The result is that, without using a passive, high-natural-number multiplier circuit, such as a varactor diode, which is expensive, it is possible to convert the output frequency of the standard oscillator into a resonant frequency signal of a rubidium atom, thus downsizing the circuits of the atomic oscillator and reducing the term and cost of manufacture.
    Type: Grant
    Filed: March 28, 2000
    Date of Patent: October 9, 2001
    Assignee: Fujitsu Limited
    Inventors: Ken Atsumi, Hideyuki Matsuura, Yoshifumi Nakajima, Yoshito Koyama, Koji Nakamuta, Minoru Sakai