Patents by Inventor Wataru Iwai

Wataru Iwai 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: 20210273553
    Abstract: A power converter apparatus is provided to include a switching circuit, and a filter circuit. The switching circuit generates an AC voltage by switching a DC voltage at a predetermined switching frequency, and the filter circuit converts the AC voltage from the switching circuit into the DC voltage by low-pass filtering the AC voltage. The filter circuit includes first and second bypass capacitors, and an inductor. The first bypass capacitor bypasses noise of a first frequency component of the AC voltage from the switching circuit, and the second bypass capacitor bypasses noise of a second frequency component of the AC voltage from the switching circuit, which is lower than the first frequency component. The inductor is inserted between the first and second bypass capacitors, and the inductance thereof is set so that a resonance frequency of the filter circuit is lower than multiple times the switching frequency by insertion of the inductor.
    Type: Application
    Filed: March 11, 2019
    Publication date: September 2, 2021
    Inventors: Noriyuki NOSAKA, Takeo NISHIKAWA, Wataru OKADA, Satoshi IWAI, Takanori ISHII, Gun ETO
  • Patent number: 6981943
    Abstract: Disclosed is a respiration leading system which can leads a living body to respire so that relaxation is effectively induced without any physiological load even if a respiration exercise feedback is not employed. This system comprises a control unit and a sense-stimulating unit. The control unit makes the sense-stimulating unit change the output energy for stimulating a sense of the living body so that the living body is induced to inhale and exhale as a physiological reaction. The energy change is done within the range of a respiration period x(sec) and a parameter y defined as 2 sec<x<12 sec and 0.85<y<1.45 (a region x?4 sec and y?1.3 is excluded). The parameter y is a ratio of exhaling time to inhaling time. The energy output in the first half period corresponding to either inhaling or exhaling and the energy output in the latter half corresponding to the other, induce the living body to respire.
    Type: Grant
    Filed: November 6, 2002
    Date of Patent: January 3, 2006
    Assignees: Matsushita Electric Works, Ltd., Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroki Noguchi, Manabu Inoue, Wataru Iwai, Hiromitsu Kobayashi, Katsushige Amano, Tadashi Yano, Yoshinori Tanabe
  • Patent number: 6720743
    Abstract: In a lighting system capable of varying luminance of the light emitting surface periodically used for adjusting rhythm of breathing of an observer when he wishes to fall asleep, a light source is controlled in a manner so that variation of the luminance “L” per a unit time in the vicinity at a time tMAX when the luminance “L” takes the largest value in one period becomes larger than the variation of the luminance “L” per the unit time in the vicinity at a time tMIN when the luminance “L” takes the smallest value.
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: April 13, 2004
    Assignees: Matsushita Electric Industrial Co., Ltd., Matsushita Electric Works, Ltd.
    Inventors: Tadashi Yano, Katsushige Amano, Yoshinori Tanabe, Hiroki Noguchi, Manabu Inoue, Wataru Iwai
  • Publication number: 20030171643
    Abstract: Disclosed is a respiration leading system which can leads a living body to respire so that relaxation is effectively induced without any physiological load even if a respiration exercise feedback is not employed. This system comprises a control unit and a sense-stimulating unit. The control unit makes the sense-stimulating unit change the output energy for stimulating a sense of the living body so that the living body is induced to inhale and exhale as a physiological reaction. The energy change is done within the range of a respiration period x(sec) and a parameter y defined as 2 sec<x<12 sec and 0.85<y<1.45 (a region x≦4 sec and y≧1.3 is excluded). The parameter y is a ratio of exhaling time to inhaling time. The energy output in the first half period corresponding to either inhaling or exhaling and the energy output in the latter half corresponding to the other, induce the living body to respire.
    Type: Application
    Filed: November 6, 2002
    Publication date: September 11, 2003
    Applicant: MATSUSHITA ELECTRIC WORKS, LTD.
    Inventors: Hiroki Noguchi, Manabu Inoue, Wataru Iwai, Hiromitsu Kobayashi, Katsushige Amano, Tadashi Yano, Yoshinori Tanabe
  • Publication number: 20030062856
    Abstract: In a lighting system capable of varying luminance of the light emitting surface periodically used for adjusting rhythm of breathing of an observer when he wishes to fall asleep, a light source is controlled in a manner so that variation of the luminance “L” per a unit time in the vicinity at a time tMAX when the luminance “L” takes the largest value in one period becomes larger than the variation of the luminance “L” per the unit time in the vicinity at a time tMIN when the luminance “L” takes the smallest value.
    Type: Application
    Filed: September 26, 2002
    Publication date: April 3, 2003
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tadashi Yano, Katsushige Amano, Yoshinori Tanabe, Hiroki Noguchi, Manabu Inoue, Wataru Iwai