Patents by Inventor Katsuyoshi Aihara

Katsuyoshi Aihara 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: 11226593
    Abstract: An analog electronic watch includes watch's internal time, and controls rotation of a group of indicators based on the watch's internal time. A terminal appliance stops the rotation of the group of indicators, generates an image of the indicators and the dial plate with an imaging unit, detects current display positions of the group of indicators in identification areas as part of the image of the indicators and the dial plate, generates current display time information based on the current display positions, and generates display time correction information based on a difference between the current display time information and the watch's internal time information. The analog electronic watch corrects the display positions of the group of indicators based on the display time correction information. There are provided an analog electronic watch system and an analog electronic watch that can reduce a time required for display time correction.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: January 18, 2022
    Assignee: CITIZEN WATCH CO., LTD.
    Inventors: Makoto Watanabe, Katsuyoshi Aihara, Daisuke Matsuoh, Daisuke Yamada, Ryutaro Uemura
  • Publication number: 20200379411
    Abstract: An analog electronic watch includes watch's internal time, and controls rotation of a group of indicators based on the watch's internal time. A terminal appliance stops the rotation of the group of indicators, generates an image of the indicators and the dial plate with an imaging unit, detects current display positions of the group of indicators in identification areas as part of the image of the indicators and the dial plate, generates current display time information based on the current display positions, and generates display time correction information based on a difference between the current display time information and the watch's internal time information. The analog electronic watch corrects the display positions of the group of indicators based on the display time correction information. There are provided an analog electronic watch system and an analog electronic watch that can reduce a time required for display time correction.
    Type: Application
    Filed: March 28, 2018
    Publication date: December 3, 2020
    Applicant: CITIZEN WATCH CO., LTD.
    Inventors: Makoto WATANABE, Katsuyoshi AIHARA, Daisuke MATSUOH, Daisuke YAMADA, Ryutaro UEMURA
  • Patent number: 6853219
    Abstract: Charging a storage cell requires the electromotive force exerted at a photogenerating cell in addition to the voltage equal to or higher than the forward on voltage developed at an backflow preventing diode. Therefore, the charging is inefficient. Moreover, the area of the backflow preventing diode must be large in consideration for a current supply from the photogenerating cell at a high intensity of illumination. A charging circuit, constructed using a differential amplifier, which has a power supply therefor separated from another power supply, is used as a direction-of-current detecting circuit that detects the direction of current from a voltage difference between two different power supplies. Consequently, a switch is logically turned on or off depending on whether charging or non-charging is under way. Thus, on voltage to be developed during charging is lowered. Moreover, the size or area of a transistor that acts as a logical circuit is made smaller than that of the backflow preventing diode.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: February 8, 2005
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Katsuyoshi Aihara, Takaaki Nozaki, Ryoji Iwakura
  • Publication number: 20040155697
    Abstract: Charging a storage cell requires the electromotive force exerted at a photogenerating cell in addition to the voltage equal to or higher than the forward on voltage developed at an backflow preventing diode. Therefore, the charging is inefficient. Moreover, the area of the backflow preventing diode must be large in consideration for a current supply from the photogenerating cell at a high intensity of illumination.
    Type: Application
    Filed: August 7, 2003
    Publication date: August 12, 2004
    Inventors: Katsuyoshi Aihara, Takaaki Nozaki, Ryoji Iwakura
  • Patent number: 6727769
    Abstract: A crystal oscillator circuit using CMOSFETs including an oscillator circuit that is constructed of a resonating section and an amplifying section having a CMOSFET, a reference current source circuit for generating a reference current which determines a bias current of the amplifying section, and a control signal generator circuit for controlling the reference current source circuit to make a bias current larger than that in the oscillation status when the oscillator circuit is in the non-oscillation status. As a result, the reference current source circuit constant-current biases the DC bias of the amplifying section without depending on the source voltage. Therefore, it can lower the driving source voltage of the oscillator circuit. Further, only the bias current of the amplifying section is increased during the oscillation starting period of the oscillator circuit, so that the oscillator circuit can provide a stable oscillation with low power, without variations in the source voltage.
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: April 27, 2004
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Katsuyoshi Aihara, Ryoji Iwakura, Takakazu Yano, Yukio Otaka, Shinichi Komine
  • Publication number: 20020180542
    Abstract: A crystal oscillator circuit using CMOSFETs including an oscillator circuit that is constructed of a resonating section and an amplifying section having a CMOSFET, a reference current source circuit for generating a reference current which determines a bias current of the amplifying section, and a control signal generator circuit for controlling the reference current source circuit to make a bias current larger than that in the oscillation status when the oscillator circuit is in the non-oscillation status. As a result, the reference current source circuit constant-current biases the DC bias of the amplifying section without depending on the source voltage. Therefore, it can lower the driving source voltage of the oscillator circuit. Further, only the bias current of the amplifying section is increased during the oscillation starting period of the oscillator circuit, so that the oscillator circuit can provide a stable oscillation with low power, without variations in the source voltage.
    Type: Application
    Filed: May 31, 2002
    Publication date: December 5, 2002
    Applicant: CITIZEN WATCH CO., LTD.
    Inventors: Katsuyoshi Aihara, Ryoji Iwakura, Takakazu Yano, Yukio Otaka, Shinichi Komine
  • Patent number: 5986311
    Abstract: A gate oxide film is formed on a thin-film SOI substrate or on a single crystalline silicon substrate and a gate is formed on the gate oxide film. The surfaces of a single crystalline silicon at diffusion layer regions on opposite sides of the gate are cleaned and an amorphous silicon film is formed thereon and on the side walls of the gate. Impurity ions are implanted in the amorphous silicon film, which is then converted into recrystallized silicon films by annealing. An interlayer insulator film is formed and another annealing is conducted. As a result, impurity ions in the recrystallized silicon films diffuse into the diffusion layer region of the single crystalline silicon and are activated to form a source and a drain.
    Type: Grant
    Filed: May 19, 1997
    Date of Patent: November 16, 1999
    Assignee: Citizen Watch Company, Ltd.
    Inventor: Katsuyoshi Aihara
  • Patent number: 5960268
    Abstract: A gate oxide film is formed on a thin-film SOI substrate or on a single crystalline silicon substrate and a gate is formed on the gate oxide film. The surfaces of a single crystalline silicon at diffusion layer regions on opposite sides of the gate are cleaned and an amorphous silicon film is formed thereon and on the side walls of the gate. Impurity ions are implanted in the amorphous silicon film, which is then converted into recrystallized silicon films by annealing. An interlayer insulator film is formed and another annealing is conducted. As a result, impurity ions in the recrystallized silicon films diffuse into the diffusion layer region of the single crystalline silicon and are activated to form a source and a drain.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: September 28, 1999
    Assignee: Citizen Watch Co., Ltd.
    Inventor: Katsuyoshi Aihara