Patents by Inventor Katsuaki Hiraoka

Katsuaki Hiraoka 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).

  • Life predicting method for solder joint, life predicting apparatus for solder joint and electronic device
    Patent number: 8965712
    Abstract: A life predicting method for a solder joint includes a step of referring to a temperature history of a measurement object having a solder joint, a step of examining at least one physical quantity selected from the group consisting of amplitude, a cycle number, a mean temperature, and a periodic length of a temperature variation with a cycle count method from the temperature history, a step of calculating a strain range by utilizing a previously prepared response surface from the physical quantity examined with the cycle count method, and a step of calculating a strain range increasing rate from a strain range with reference to a previously obtained damage index and a strain variation history of the strain range.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: February 24, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takahiro Omori, Kenji Hirohata, Tomoko Monda, Katsuaki Hiraoka, Minoru Mukai
  • LIFE PREDICTING METHOD FOR SOLDER JOINT, LIFE PREDICTING APPARATUS FOR SOLDER JOINT AND ELECTRONIC DEVICE
    Publication number: 20120072129
    Abstract: A life predicting method for a solder joint includes a step of referring to a temperature history of a measurement object having a solder joint, a step of examining at least one physical quantity selected from the group consisting of amplitude, a cycle number, a mean temperature, and a periodic length of a temperature variation with a cycle count method from the temperature history, a step of calculating a strain range by utilizing a previously prepared response surface from the physical quantity examined with the cycle count method, and a step of calculating a strain range increasing rate from a strain range with reference to a previously obtained damage index and a strain variation history of the strain range.
    Type: Application
    Filed: March 18, 2011
    Publication date: March 22, 2012
    Inventors: Takahiro OMORI, Kenji Hirohata, Tomoko Monda, Katsuaki Hiraoka, Minoru Mukai