Patents by Inventor Mitsuru Shibasaki

Mitsuru Shibasaki 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).

  • Motor driving apparatus, driving method thereof and mobile terminal
    Patent number: 7102312
    Abstract: A motor driving apparatus and a driving method thereof, and a mobile terminal in which a terminal voltage value of a terminal is detected at a terminal voltage detection unit, and is held in a holding circuit. A difference between the terminal voltage value detected this time and the terminal voltage value detected last time and held in the holding circuit is calculated in a difference circuit, and the calculated difference voltage value is compared with a reference voltage value determining a rated frequency in a comparator. A synchronizing reference voltage value of a reference voltage source is controlled by a control circuit on the basis of each comparison result in the comparators and a frequency of a synchronizing reference signal specified as a basic operation time unit at the time of synchronous driving is corrected so that a stable synchronous operation condition can be obtained before a rotor of a brushless motor steps out from a synchronous operation.
    Type: Grant
    Filed: April 22, 2003
    Date of Patent: September 5, 2006
    Assignee: Sony Corporation
    Inventors: Masahiro Suzuki, Masafumi Kikuchi, Akira Fujino, Mitsuru Shibasaki, Hitoshi Suzuki, Shun Kayama
  • Motor driving apparatus, motor driving method,and mobile terminal
    Publication number: 20060001389
    Abstract: A motor driving apparatus and a driving method thereof, and a mobile terminal in which a terminal voltage value of a terminal is detected at a terminal voltage detection unit, and is held in a holding circuit. A difference between the terminal voltage value detected this time and the terminal voltage value detected last time and held in the holding circuit is calculated in a difference circuit, and the calculated difference voltage value is compared with a reference voltage value determining a rated frequency in a comparator. A synchronizing reference voltage value of a reference voltage source is controlled by a control circuit on the basis of each comparison result in the comparators and a frequency of a synchronizing reference signal specified as a basic operation time unit at the time of synchronous driving is corrected so that a stable synchronous operation condition can be obtained before a rotor of a brushless motor steps out from a synchronous operation.
    Type: Application
    Filed: April 22, 2003
    Publication date: January 5, 2006
    Applicant: SONY CORPORATION
    Inventors: Masahiro Suzuki, Masafumi Kikuchi, Akira Fujino, Mitsuru Shibasaki, Hitoshi Suzuki, Shun Kayama
  • Semiconductor device having a hetero junction
    Patent number: 4062034
    Abstract: A semiconductor device comprising a silicon substrate with an oxygen doped polycrystalline or amorphous silicon layer formed on the substrate so as to form a hetero junction therewith. A transistor formed according to the invention has an emitter-base hetero junction and has a high current gain.
    Type: Grant
    Filed: April 23, 1976
    Date of Patent: December 6, 1977
    Assignee: Sony Corporation
    Inventors: Takeshi Matsushita, Hisao Hayashi, Mitsuru Shibasaki