Patents by Inventor Masahiro Murakawa

Masahiro Murakawa 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).

  • Retarder and optical head device installing the same
    Publication number: 20030123371
    Abstract: An adhesive is coated on at least one surface of a thin film of organic material having birefringent properties and a phase-difference producing function, and a fixing substrate having transmitting or reflecting properties is bonded to the thin film of organic material by the adhesive, wherein materials satisfying relations of E1<E2 and E3<E2 where E1 is the linear expansion coefficient of the thin film of organic material, E2 is the linear expansion coefficient of the adhesive and E3 is the linear expansion coefficient of the fixing substrate, and the glass transition temperature of the thin film of organic material being 150° or more, are selected.
    Type: Application
    Filed: November 19, 2002
    Publication date: July 3, 2003
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Takehiko Nishiyama, Naomitsu Umemura, Hiromasa Sato, Masahiro Murakawa, Yoshiharu Ooi, Yuzuru Tanabe
  • Phase shifter and optical head device mounted with the same
    Patent number: 6580674
    Abstract: An adhesive is coated on at least one surface of a thin film of organic material having birefringent properties and a phase-difference producing function, and a fixing substrate having transmitting or reflecting properties is bonded to the thin film of organic material by the adhesive, wherein materials satisfying relations of E1<E2 and E3<E2 where E1 is the linear expansion coefficient of the thin film of organic material, E2 is the linear expansion coefficient of the adhesive and E3 is the linear expansion coefficient of the fixing substrate, and the glass transition temperature of the thin film of organic material being 150° or more, are selected.
    Type: Grant
    Filed: May 22, 2001
    Date of Patent: June 17, 2003
    Assignee: Asahi Glass Company, Limited
    Inventors: Takehiko Nishiyama, Naomitsu Umemura, Hiromasa Sato, Masahiro Murakawa, Yoshiharu Ooi, Yuzuru Tanabe
  • Capacitance position sensor and position controller equipped with the sensor
    Publication number: 20030080756
    Abstract: A capacitance position sensor comprises a pair of opposed tabular electrodes, an LC oscillator circuit having a toroidal core winding and whose oscillating frequency varies with change in capacitance between the pair of electrodes, and an arithmetic processing unit for calculating an absolute value of a distance between the electrodes from the oscillating frequency of the oscillator circuit. A position controller comprises a stationary member formed with one electrode of the pair of electrodes of the position sensor, a movable member on which the other electrode of the pair of electrodes is formed, and moving means for moving the movable member relative to the stationary member.
    Type: Application
    Filed: October 25, 2002
    Publication date: May 1, 2003
    Applicant: National Inst. of Advanced Ind. Science and Tech.
    Inventors: Yuji Kasai, Hirokazu Nosato, Masahiro Murakawa, Taro Itatani, Tetsuya Higuchi
  • Optical axis adjustment method, and storage medium recorded with a program that executes said adjustment method
    Publication number: 20020101581
    Abstract: A method is provided for adjusting the optical axis of a light transmission path that includes a plurality of optical components. The method uses an apparatus to sequentially adjust the optical axis of one or more of the optical components, using a probabilistic search technique to obtain an optimum evaluation value with respect to light transmitted through the light transmission path.
    Type: Application
    Filed: December 29, 2000
    Publication date: August 1, 2002
    Inventors: Masahiro Murakawa, Tetsuya Higuchi