Patents by Inventor Masayuki Togawa

Masayuki Togawa 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 manufacturing article having magnetic patterns
    Patent number: 5427675
    Abstract: An article comprising a substrate formed with predetermined patterns and magnetized magnetic substances arranged in the substrate in accordance with the predetermined patterns, and a method of manufacturing an article with magnetized magnetic substances arranged according to predetermined patterns, comprising the steps of arranging said magnetic substances in a substrate in accordance with the predetermined patterns and magnetizing the magnetic substances.
    Type: Grant
    Filed: March 18, 1993
    Date of Patent: June 27, 1995
    Assignee: Teijin Seiki Co., Ltd.
    Inventors: Kiyoshi Toyama, Masayuki Togawa
  • Magnetic medium comprising a substrate having pits and grooves of specific shapes and depths
    Patent number: 5350618
    Abstract: A magnetic medium comprising a substrate formed with a stepped pit and a magnetic substance buried in the stepped pit. A method of manufacturing a magnetic medium comprising the steps of forming a first groove in a substrate by photoetching, forming a second groove in the first groove or in a portion adjacent to the first groove by the photoetching, the second groove being different in depth from the first groove, and burying magnetic substances into the first and second grooves.
    Type: Grant
    Filed: February 26, 1992
    Date of Patent: September 27, 1994
    Assignee: Teijin Seiki Co., Ltd.
    Inventors: Masayuki Togawa, Kiyoshi Toyama
  • Magnetic medium and method of manufacturing the same
    Patent number: 5336586
    Abstract: A magnetic medium comprising a substrate formed with a stepped pit and a magnetic substance buried in the stepped pit.A method of manufacturing a magnetic medium comprising the steps of forming a first groove in a substrate by photoetching, forming a second groove in the first groove or in a portion adjacent to the first groove by the photoetching, the second groove being different in depth from the first groove, and burying magnetic substances into the first and second grooves.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: August 9, 1994
    Assignee: Teijin Seiki Co., Ltd.
    Inventors: Masayuki Togawa, Kiyoshi Toyama
  • Magneto-optic magnetic-field measuring apparatus for measuring a magnetic field intensity by measuring an angle of diffraction
    Patent number: 5281912
    Abstract: A magnetic-field measuring apparatus comprising a polarizing element for generating polarized light that transmits parallel to the lines of magnetic force of a first magnetic field, a Faraday effect element for generating a banded magnetic domain substantially perpendicular to the transmission direction of the polarized light generated by the polarizing element and for diffracting the polarized light by the banded magnetic domain, a magnetic-field generating unit for generating a second magnetic field having lines of magnetic force which cross at right angles with the transmission direction of the polarized light generated by the polarizing element and are parallel to the banded magnetic domain generated by the Faraday effect element, a position detecting unit for detecting a position at which diffracted light of other than zero-order diffracted by the Faraday effect element is received, and a magnetic-field-intensity detecting unit for detecting a magnetic field intensity of the first magnetic field on the b
    Type: Grant
    Filed: February 19, 1992
    Date of Patent: January 25, 1994
    Assignee: Teijin Seiki Co., Ltd.
    Inventor: Masayuki Togawa