Patents by Inventor Tutomu Kawasaki

Tutomu Kawasaki 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 mounting a light emitting chip and an optical fiber on a photoelectric device
    Patent number: 4997243
    Abstract: In a photoelectric device, particularly, a photoelectric device for optical communication, an optical fiber is fixed at two fixing points so that the extremity of the optical fiber is disposed opposite to the light emitting surface of a laser diode chip and the optical fiber extends in a nonlinear shape, for example, in a moderate curve, between the two fixing points. Even though holding members fixedly holding the optical fiber at the two fixing points and a base member supporting the holding members are formed of a metal or metals having a coefficient of thermal expansion far greater than that of the optical fiber, and even if the distance between the two fixing points is varied due to the thermal expansion or contraction of the holding members and the base member, the optical fiber is obliged only to change the shape of extension.
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: March 5, 1991
    Assignees: Hitachi, Ltd., Hitachi Tobu Semiconductor, Ltd.
    Inventors: Kunio Aiki, Atsushi Sasayama, Tugio Nemoto, Makoto Haneda, Satoru Ishii, Haruo Kugimiya, Tutomu Kawasaki
  • Photoelectric device with leads
    Patent number: 4920262
    Abstract: In a photoelectric device, particularly, a photoelectric device for optical communication, an optical fiber is fixed at two fixing points so that the extremity of the optical fiber is disposed opposite to the light emitting surface of a laser diode chip and the optical fiber extends in a nonlinear shape, for example, in a moderate curve, between the two fixing points. Even though holding members fixedly holding the optical fiber at the two fixing points and a base member supporting the holding members are formed of a metal or metals having a coefficient of thermal expansion far greater than that of the optical fiber, and even if the distance between the two fixing points is varied due to the thermal expansion or contraction of the holding members and the base member, the optical fiber is obliged only to change the shape of extension.
    Type: Grant
    Filed: February 3, 1989
    Date of Patent: April 24, 1990
    Assignees: Hitachi, Ltd., Hitachi Tobu Semiconductor
    Inventors: Kunio Aiki, Atsushi Sasayama, Tugio Nemoto, Makoto Haneda, Satoru Ishii, Haruo Kugimiya, Tutomu Kawasaki
  • Photoelectric device with optical fiber and laser emitting chip
    Patent number: 4803361
    Abstract: In a photoelectric device, particularly, a photoelectric device for optical communication, an optical fiber is fixed at two fixing points so that the extremity of the optical fiber is disposed opposite to the light emitting surface of a laser diode chip and the optical fiber extends in a nonlinear shape, for example, in a moderate curve, between the two fixing points. Even though holding members fixedly holding the optical fiber at the two fixing points and a base member supporting the holding members are formed of a metal or metals having a coefficient of thermal expansion far greater than that of the optical fiber, and even if the distance between the two fixing points is varied due to the thermal expansion or contraction of the holding members and the base member, the optical fiber is obliged only to change the shape of extension.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: February 7, 1989
    Assignees: Hitachi, Ltd., Hitachi Tobu Semiconductor, Ltd.
    Inventors: Kunio Aiki, Atsushi Sasayama, Tugio Nemoto, Makoto Haneda, Satoru Ishii, Haruo Kugimiya, Tutomu Kawasaki