Patents by Inventor Junji Yuasa

Junji Yuasa 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).

  • Backlighted keyboard and method using patterned light guide
    Patent number: 7891829
    Abstract: A keyboard apparatus. The apparatus has a housing including a plurality of key pads, including at least twenty six key pads spatially disposed within the housing. Each of the key pads is depressible upon touch by a user. An optically transparent circuit board is coupled to a backside of each of the key pads. The apparatus has a light guide characterized by a planar optically transparent material having a surface region, a width, a length, and a backside region, and a thickness provided between the surface region and the backside region. The apparatus has a plurality of patterns disposed on the surface region and optically coupled respectively to each of the twenty six key members. In a specific embodiment, the apparatus has a light emitting diode provided within a center region of the surface region to emit electromagnetic radiation.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: February 22, 2011
    Assignee: Minebea Co., Ltd.
    Inventors: Toshisada Takeda, Satoshi Kawashima, Junji Yuasa, Yohei Ishii
  • BACKLIGHTED KEYBOARD AND METHOD USING PATTERNED LIGHT GUIDE
    Publication number: 20090067153
    Abstract: A keyboard apparatus. The apparatus has a housing including a plurality of key pads, including at least twenty six key pads spatially disposed within the housing. Each of the key pads is depressible upon touch by a user. An optically transparent circuit board is coupled to a backside of each of the key pads. The apparatus has a light guide characterized by a planar optically transparent material having a surface region, a width, a length, and a backside region, and a thickness provided between the surface region and the backside region. The apparatus has a plurality of patterns disposed on the surface region and optically coupled respectively to each of the twenty six key members. In a specific embodiment, the apparatus has a light emitting diode provided within a center region of the surface region to emit electromagnetic radiation.
    Type: Application
    Filed: April 18, 2008
    Publication date: March 12, 2009
    Applicant: Minebea Co., Ltd.
    Inventors: TOSHISADA TAKEDA, Satoshi Kawashima, Junji Yuasa, Yohei Ishii