Patents by Inventor Hideo Suyama

Hideo Suyama 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).

  • Patent number: 4691259
    Abstract: A magnetoresistance effect type magnetic head apparatus has a magnetoresistance effect sensing element, means for applying a bias magnetic field to the sensing element, a detecting circuit for obtaining a detecting signal, a low pass filter for deriving an unwanted signal component from the detecting signal, and means for applying a cancelling magnetic field to the sensing element so as to eliminate the unwanted signal component. An additional sensing element may also be provided to detect an external magnetic field, and a corresponding signal is generated which is applied to a first sensing element so as to cancel the effects of the external magnetic field.
    Type: Grant
    Filed: August 27, 1985
    Date of Patent: September 1, 1987
    Assignee: Sony Corporation
    Inventors: Shigeyoshi Imakoshi, Munekatsu Fukuyama, Hideo Suyama, Yutaka Souda
  • Patent number: 4679107
    Abstract: A magnetic head utilizing the magnetoresistance effect comprising a magnetoresistance effect element and a conductor for applying a bias magnetic field to the element by being supplied with a bias current. The conductor is further supplied with a decaying alternating current superimposed on the bias current in advance of the playback operation, so that the hysteresis effect of the magnetic circuit is cancelled and the invariable output characteristics of the magnetic head are obtained.
    Type: Grant
    Filed: August 23, 1984
    Date of Patent: July 7, 1987
    Assignee: Sony Corporation
    Inventors: Shigeyoshi Imakoshi, Yutaka Soda, Hideo Suyama, Yasuhiro Iida
  • Patent number: 4673998
    Abstract: A magnetic transducer head utilizing magnetoresistance effect having a circuit for applying a constant voltage to outer ends of at least one pair of magnetoresistance effect elements provided in series on a discontinuous portion other than a magnetic gap of a magnetic core forming a magnetic gap and a conductor arrangement for applying bias magnetic fields opposite in polarity to the magnetoresistance effect elements, respectively wherein an output is derived from a connected point between the pair of magnetoresistance effect elements.
    Type: Grant
    Filed: October 27, 1983
    Date of Patent: June 16, 1987
    Assignee: Sony Corporation
    Inventors: Yutaka Souda, Shigeyoshi Imakoshi, Hideo Suyama, Hiroyuki Uchida, Yasuhiro Iida, Tetsuo Sekiya
  • Patent number: 4673999
    Abstract: A multi channel magnetic transducer head comprises a magnetic substrate, and a plurality of thin film type magnetic transducer head elements arranged on the magnetic substrate, each magnetic transducer head element including a coil conductor disposed on the magnetic substrate and a thin film magnetic core to constitute a magnetic circuit in co-operation with the substrate, wherein a non-magnetic gap spacer layer with a predetermined thickness is formed at track width portion below front end of the thin film magnetic core on the magnetic core, a non-magnetic layer with thickness larger than that of the gap spacer layer is formed at track spacing portion, the thin film magnetic core has width covering at least the gap spacer layer of the track width portion, thereby good magnetic recording can be performed.
    Type: Grant
    Filed: August 23, 1984
    Date of Patent: June 16, 1987
    Assignee: Sony Corporation
    Inventors: Hideo Suyama, Shigeyoshi Imakoshi, Yutaka Soda, Takeyuki Fuse, Iwao Abe, Noboru Wakabayashi
  • Patent number: 4516179
    Abstract: A magnetic transducer head utilizing magnetoresistance effect is disclosed which includes a thin film magnetoresistance effect element held between, first and second substrates, at least one of the first and second substrates being formed of an electrically conductive material, and a biasing means for the magnetoresistance effect element to satisfy a potential relation V.sub.MR -V.sub.S .ltoreq.0.2 volt, wherein V.sub.MR is a potential of the magnetoresistance effect element, and V.sub.S is a potential of the conductive substrate.
    Type: Grant
    Filed: August 13, 1982
    Date of Patent: May 7, 1985
    Assignee: Sony Corporation
    Inventors: Shigeyoshi Imakoshi, Yutaka Soda, Hiroyuki Uchida, Junkichi Sugita, Hiroshi Takino, Tetsuo Sekiya, Hideo Suyama
  • Patent number: 4281223
    Abstract: An electro-acoustic transducer, such as a loudspeaker, a microphone, or the like, comprises a magnetic circuit having at least one air gap, a current conductor disposed in the air gap of the magnetic circuit to form a voice coil which is traversed by magnetic flux, and a vibratory structure mechanically coupled to the voice coil. The vibratory structure is comprised of a heat resistant film containing an epoxide-modified resin in which a heterocyclic compound containing a polyimide group is the main component. The voice coil is non-adhesively secured to the vibratory structure. For example, the voice coil is formed of a conductive substrate onto which the vibratory structure is coated and from which portions have been etched to form a generally spiral-shaped conductor. In one embodiment, the vibratory structure is a diaphragm; and in another embodiment, the vibratory structure is a bobbin having the voice coil wound thereon.
    Type: Grant
    Filed: August 14, 1979
    Date of Patent: July 28, 1981
    Assignee: Sony Corporation
    Inventors: Masana Ugaji, Hideo Suyama, Sadaaki Sakurai, Shigenori Yamaoka, Toshinaga Endo, Akinobu Kusuhara
  • Patent number: 4276452
    Abstract: In an electro-acoustic transducer having a magnetic circuit and a vibrative member disposed in an air gap formed in the magnetic circuit, the vibrative member having a frame with an opening, a membrane mounted on the frame, an acoustic transparent member mounted on the frame so as to define a space between the membrane and the acoustic transparent member, and an acoustic damping material disposed in the space.
    Type: Grant
    Filed: August 2, 1979
    Date of Patent: June 30, 1981
    Assignee: Sony Corporation
    Inventors: Hideo Suyama, Masana Ugaji
  • Patent number: 4273968
    Abstract: A flat type electro-acoustic transducer such as a ribbon type loudspeaker has a magnetic circuit comprising a pair of air gaps and a diaphragm having a spiral coil disposed in the air gaps. In this case, the magnetic flux in the air gaps is slantly across the diaphragm.
    Type: Grant
    Filed: May 17, 1979
    Date of Patent: June 16, 1981
    Assignee: Sony Corporation
    Inventor: Hideo Suyama