Patents by Inventor Rokuro Sasaki

Rokuro Sasaki 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).

  • Proximity detecting apparatus
    Patent number: 4030037
    Abstract: A compact and low-cost apparatus for detecting the proximity of a human body and generating a corresponding electrical signal is disclosed which apparatus includes an oscillator and an operational amplifier. Under normal conditions, equal input voltages are applied to the input terminals of the operational amplifier, whereas the equilibrium of the input voltages is lost by the approach of a human body to the apparatus.The present invention relates to a proximity switch for detecting an approaching human body or other conductive object and generating a corresponding electrical signal.The conventional proximity switches are such that the oscillating conditions of an oscillator included in the proximity switch are changed by utilizing the electrostatic capacity produced between a human body or other conductive material and a detector means of the proximity switch as a result of the approach of the human body or conductive material.
    Type: Grant
    Filed: January 21, 1974
    Date of Patent: June 14, 1977
    Assignee: Hitachi, Ltd.
    Inventors: Minoru Tanaka, Shoichi Mitani, Takeo Yuminaka, Rokuro Sasaki, Hatuya Nakamura