Patents by Inventor Hironori Shimatsu

Hironori Shimatsu 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).

  • Method of making piezoelectric vibrator
    Patent number: 4080696
    Abstract: A piezoelectric vibrator element is shaped by photo-etching techniques from a quartz crystal wafer. Film electrodes and masses for frequency adjustment are applied by first depositing a layer of chromium and then a layer of gold on the element by vacuum depositing or sputtering. The element is then kept in a high vacuum of at least 10.sup.-5 torr and at a high temperature of 300.degree. C to fix the depositions on the element and eliminate distortion. To adjust the frequency, a portion of the metal mass is removed by a laser beam, after which the element is kept in a high vacuum at high temperature to affix securely to the element any bits of metal that may have condensed during the removing step. .
    Type: Grant
    Filed: January 28, 1977
    Date of Patent: March 28, 1978
    Assignee: Kabushiki Kaisha Daini Seikosha
    Inventor: Hironori Shimatsu