Patents by Inventor Kazuhisa Tohyama

Kazuhisa Tohyama 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: 7646678
    Abstract: Provided is a watch capable of performing digital display as well as analog display. The watch can offer digital display without posing disadvantages peculiar to a liquid crystal panel. On the other hand, the watch can reduce the restrictions in design and make the digital display larger and easier to see. The watch includes a light-shielding plate 22 on the rear side of the dial 24. In the light-shielding plate, light-transmitting holes 23 are made piercing from a front of the light-shielding plate to a rear thereof. Thin chip LEDs 17 are inserted in the light-transmitting holes, and mounted on a circuit board 16. The circuit board is placed on the rear side of the light-shielding plate. On the rear side of the circuit board, an analog movement 13 is provided, and an LED drive circuit 33 for driving the LEDs is placed. Thus, the LEDs 17 for digital display are placed on the rear side of the dial.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: January 12, 2010
    Assignee: Ricoh Elemex Corporation
    Inventors: Toshiyuki Imai, Hiroyuki Satou, Masahide Hasegawa, Kazuhisa Tohyama, Keiji Nakagawa, Kentarou Hayashi
  • Publication number: 20080101161
    Abstract: Provided is a watch capable of performing digital display as well as analog display. The watch can offer digital display without posing disadvantages peculiar to a liquid crystal panel. On the other hand, the watch can reduce the restrictions in design and make the digital display larger and easier to see. The watch includes a light-shielding plate 22 on the rear side of the dial 24. In the light-shielding plate, light-transmitting holes 23 are made piercing from a front of the light-shielding plate to a rear thereof. Thin chip LEDs 17 are inserted in the light-transmitting holes, and mounted on a circuit board 16. The circuit board is placed on the rear side of the light-shielding plate. On the rear side of the circuit board, an analog movement 13 is provided, and an LED drive circuit 33 for driving the LEDs is placed. Thus, the LEDs 17 for digital display are placed on the rear side of the dial.
    Type: Application
    Filed: September 20, 2005
    Publication date: May 1, 2008
    Inventors: Toshiyuki Imai, Hiroyuki Satou, Masahide Hasegawa, Kazuhisa Tohyama, Keiji Nakagawa, Kentarou Hayashi
  • Patent number: D569741
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: May 27, 2008
    Assignee: Ricoh Elemex Corporation
    Inventors: Hiroyuki Satou, Masahide Hasegawa, Kazuhisa Tohyama, Toshiyuki Imai, Keiji Nakagawa, Kentarou Hayashi