Patents by Inventor Hisayuki Yazawa

Hisayuki Yazawa 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).

  • Publication number: 20100281980
    Abstract: A physical quantity sensor includes a support substrate, anchor portions fixed to a top surface of the support substrate, a movable portion positioned above the support substrate and supported by the anchor portions with support portions provided therebetween such that the movable portion is movable in a height direction, and detection portions for detecting a displacement of the movable portion. The support portions include beam portions provided between the movable portion and the anchor portions such that spring portions are provided between the beam portions and each of the movable portion and the anchor portions, the beam portions having a rigidity higher than a rigidity of the spring portions. The movable portion translates in the height direction owing to twisting of the spring portions and displacements in the height direction of distal ends of the beam portions, the movable portion being supported at the distal end.
    Type: Application
    Filed: July 22, 2010
    Publication date: November 11, 2010
    Inventors: Hisayuki Yazawa, Kiyoshi Sato, Katsuya Kikuiri, Toru Takahashi, Hisanobu Ohkawa
  • Patent number: 7692896
    Abstract: A perpendicular magnetic recording head includes a main pole layer and a return path layer that are exposed from a medium-facing surface of the recording head facing a recording medium and that face each other with a predetermined gap therebetween at the medium-facing surface. A coil layer applies a recording magnetic field to the main pole layer and the return path layer. The return path layer includes a gap adjusting layer and a main layer stacked in that order from a side facing the main pole layer. The gap adjusting layer is positioned so as to face the main pole layer and the recording medium, and is made of a magnetic material having a resistivity lower than resistivities of the main layer and the main pole layer.
    Type: Grant
    Filed: July 28, 2006
    Date of Patent: April 6, 2010
    Assignee: TDK Corporation
    Inventors: Hiroshi Kameda, Hisayuki Yazawa
  • Patent number: 7643246
    Abstract: A magnetic recording head and a method of manufacturing the magnetic recording head are provided. The perpendicular magnetic recording head includes a main magnetic pole layer and a return path layer that face each other with a gap therebetween in a lamination direction. A non-magnetic insulating layer is interposed between the main magnetic pole layer and the return path layer. At least one stepped portion is formed on a facing surface of at least one of the main magnetic pole layer and the return path layer.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: January 5, 2010
    Assignee: TDK Corporation
    Inventors: Hisayuki Yazawa, Toshinori Watanabe
  • Patent number: 7626784
    Abstract: A magnetic recording head is provided. The magnetic recording head comprises a main magnetic pole layer, a return path layer, and a coil layer. A facing surface faces a recording medium. A yoke layer is formed between the main magnetic pole layer and the return path layer. An extending front end portion is formed in the return path layer and the yoke layer is disposed inside the extending front end portion in a height direction. The main magnetic pole layer includes a front end and a rear end and the yoke layer is formed on the surface of the main magnetic pole layer to cover the base.
    Type: Grant
    Filed: September 21, 2006
    Date of Patent: December 1, 2009
    Assignee: TDK Corporation
    Inventor: Hisayuki Yazawa
  • Patent number: 7593185
    Abstract: An auxiliary yoke layer is provided on a main magnetic pole layer with a spacer layer provided therebetween. A rear end of the auxiliary yoke layer and a rear end of a return yoke layer are connected to each other. At all times except during recording, the presence of the spacer layer breaks the magnetic connection between the main magnetic pole layer and the auxiliary yoke layer. On the other hand, a recording magnetic field having a magnetic field strength significantly higher than that of a disturbance magnetic field reaches the main magnetic pole layer through the spacer layer. Thereby, the adverse effect of the disturbance magnetic field is suppressed and the recording property is appropriately maintained.
    Type: Grant
    Filed: July 13, 2006
    Date of Patent: September 22, 2009
    Assignee: TDK Corporation
    Inventor: Hisayuki Yazawa
  • Patent number: 7506432
    Abstract: A lower shield layer is formed by being embedded in a first recess formed in an under layer. Accordingly, the distance between the lower shield layer and a slider can be reduced. Also, a second metal layer is formed from above a gap layer covering an electrode extracting layer over above the under layer hindwards therefrom. Accordingly, the second metal layer can be brought closer to the slider side than an upper shield layer. Consequently, the thermal dissipation effects of the thin-film magnetic head can be improved.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: March 24, 2009
    Assignee: TDK Corporation
    Inventors: Kiyoshi Sato, Hideki Gochou, Hisayuki Yazawa
  • Patent number: 7489473
    Abstract: A magnetic head includes a first magnetic layer in which a face, opposed to a recording medium, having a size equal to a track width in a track width direction; a second magnetic layer in which a face, opposed to the recording medium, having a size greater than the track width in the track width direction, the first and second magnetic layers being spaced from each other in an element thickness direction, the first and second magnetic layers being connected to each other at a region located in a height direction; and a coil layer, located far from the opposed faces, for applying recording magnetic fields to the first and second magnetic layers such that magnetic data is recorded on the recording medium with a perpendicular magnetic field concentrated on the first magnetic layer.
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: February 10, 2009
    Assignee: TDK Corporation
    Inventor: Hisayuki Yazawa
  • Patent number: 7486477
    Abstract: A soft magnetic film is formed of a CoFeNi alloy containing trace amounts of chlorine and sulfur as impurities. The stress of the soft magnetic film can be reduced effectively, specifically to 1,200 MPa or less, by adjusting the concentration ratio of chlorine to sulfur within the range from 1 to 60. In addition, variations in film stress can be reduced to provide higher yields of CoFeNi alloy films with low stresses.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: February 3, 2009
    Assignee: TDK Corporation
    Inventors: Hisayuki Yazawa, Shio Takahashi
  • Patent number: 7472470
    Abstract: A main magnetic pore layer is formed on an insulating layer flattened into a high-flatness surface, and a yoke layer having a large film thickness is formed under the main magnetic pole layer independently of the main magnetic pole. The main magnetic pole layer has a front end surface formed in a shape with a width size gradually increasing in a direction of track width as the front end surface departs farther away from an auxiliary magnetic pole layer. A perpendicular magnetic recording head can be provided which can suppress the occurrence of fringing in a recording pattern, and can form the main magnetic pole layer with high pattern accuracy, and can satisfactorily introduce a recording magnetic field to a fore end of the main magnetic pole layer.
    Type: Grant
    Filed: January 18, 2007
    Date of Patent: January 6, 2009
    Assignee: TDK Corporation
    Inventors: Toru Takahashi, Hisayuki Yazawa, Hideki Gochou, Kiyoshi Kobayashi, Minoru Yamada, Kiyoshi Sato, Toshinori Watanabe
  • Publication number: 20080297952
    Abstract: To provide a thin-film magnetic head which suppresses PE while securing magnetic recording capability by controlling a domain of a leading end part of a main magnetic pole layer. The first flare part has a first flare angle smaller than a second flare angle of the second flare part. The second flare angle is smaller than 90°. The auxiliary yoke layer has a flare angle not smaller than the first flare angle but not greater than the second flare angle. The length h from the medium-opposing surface of the pole straight part to the end on the deeper side in the height direction of the first flare part satisfies the following conditional expression: h×Bs<0.000008[m·T] where Bs is the saturated magnetic flux density of the main magnetic pole layer.
    Type: Application
    Filed: May 23, 2008
    Publication date: December 4, 2008
    Applicant: TDK CORPORATION
    Inventors: Hiroshi KAMEDA, Hisayuki YAZAWA
  • Publication number: 20080266720
    Abstract: A thin film magnetic head is disclosed having a non-magnetic layer that is formed of a NiPRe (nickel-phosphorus-rhenium) alloy, which makes it possible to optimize the composition ratios of elements Ni, P, and Re, to obtain the non-magnetic layer having a smooth surface, and to prevent concave portions from being formed in both side surfaces of the non-magnetic layer during a milling process, thereby improving recording characteristics. The composition ratio of a NiPRe alloy forming the non-magnetic layer is set within the range surrounded by boundary lines A to D in a ternary diagram, which makes it possible to form a non-magnetic layer having a smooth surface and uniformly form the magnetic layer on the non-magnetic layer. In addition, since the NiPRe alloy having the composition ratio has a low milling rate, it is possible to prevent concave portions from being formed in both side surfaces of the magnetic layer that is formed on or underneath the non-magnetic layer.
    Type: Application
    Filed: October 15, 2007
    Publication date: October 30, 2008
    Inventors: Hisayuki Yazawa, Mitsuo Kawasaki
  • Publication number: 20080266724
    Abstract: In a perpendicular magnetic recording head in which a magnetic pole part of a main magnetic pole layer exposed at a medium-opposing surface exhibits a trapezoidal form narrower at a leading edge than at a trailing edge on the return yoke layer side, a magnetic shield layer having a pair of side shield parts separated at the leading edge so as to oppose both side faces of the magnetic pole part and a bottom shield part magnetically connected to the pair of side shield parts and positioned below the leading edge of the magnetic pole part is provided on the leading edge side in the track width direction of the magnetic pole part of the main magnetic pole layer.
    Type: Application
    Filed: April 22, 2008
    Publication date: October 30, 2008
    Applicant: TDK CORPORATION
    Inventors: Hisayuki YAZAWA, Takahiro TAOKA, Hiroshi KAMEDA
  • Publication number: 20080266723
    Abstract: In a perpendicular magnetic recording head in which a magnetic pole part of a main magnetic pole layer exposed at a medium-opposing surface exhibits a trapezoidal form narrower on the leading edge side than on the trailing edge side, a pair of partial side shield layers made of a soft magnetic material are provided on both sides in the track width direction of the magnetic pole part of the main magnetic pole layer such as to be located more on the leading edge side of the magnetic pole part.
    Type: Application
    Filed: April 22, 2008
    Publication date: October 30, 2008
    Applicant: TDK CORPORATION
    Inventors: Hisayuki YAZAWA, Takahiro TAOKA, Hiroshi KAMEDA
  • Patent number: 7433153
    Abstract: The upper magnetic pole layer and/or lower magnetic pole layer comprises a soft magnetic film having a variable region in which the chemical composition of Fe changes in the direction of thickness in at least a part thereof, and the difference of the proportions of Fe between the regions most abundant in Fe and most deficient in Fe is 4% by mass or more in the variable region. The structure of the soft magnetic film permits the saturation magnetic flux density Bs to be improved while decreasing the coercive force Hc by forming fine crystal grains, thereby enabling a thin film magnetic head excellent in high density recording to be manufactured.
    Type: Grant
    Filed: September 5, 2002
    Date of Patent: October 7, 2008
    Assignee: TDK Corporation
    Inventors: Yoshihiro Kanada, Hisayuki Yazawa
  • Publication number: 20080239569
    Abstract: A perpendicular magnetic recording head includes a main magnetic pole layer and an auxiliary yoke layer that overlaps the main magnetic pole layer as viewed in a top view and is magnetically coupled to the main magnetic pole layer. The main magnetic pole layer includes a pole straight part exposed to an opposing surface opposite a recording medium, and a flared part that extends from the pole straight part in a height direction, the flared part broadening in a track width direction as the flared part extends in the height direction. The auxiliary yoke layer includes a flared part that extends from the recording medium-opposing surface, the flared part broadening in the track width direction as the flared part extends in the height direction. The flared part of the auxiliary yoke layer is disposed at a position located closer to the rear side in the height direction than the flared part of the main magnetic pole layer.
    Type: Application
    Filed: February 27, 2008
    Publication date: October 2, 2008
    Inventors: Hisayuki Yazawa, Takahiro Taoka, Hiroshi Kameda
  • Publication number: 20080218908
    Abstract: A perpendicular magnetic recording head includes a main magnetic pole layer; and a return yoke layer laminated on the main magnetic pole layer with a magnetic gap layer formed of a nonmagnetic material disposed on an opposing surface opposite a recording medium. The return yoke layer includes a first throat part opposing the main magnetic pole layer at a side close to the recording medium-opposing surface with a first gap spacing corresponding to a film thickness of the magnetic gap layer; and a second throat part extending to a deeper side than the first throat part in a height direction and opposing the main magnetic pole layer with a second gap spacing greater than the first gap spacing. A throat height determining layer is provided on the main magnetic pole layer or the magnetic gap layer, the throat height determining layer defining a dimension of the first throat part of the return yoke layer in the height direction and formed of an inorganic nonmagnetic material.
    Type: Application
    Filed: February 26, 2008
    Publication date: September 11, 2008
    Inventors: Hisayuki Yazawa, Kiyoshi Kobayashi
  • Patent number: 7392577
    Abstract: A method of manufacturing a perpendicular magnetic head is disclosed, including perpendicular magnetic recording head includes forming a primary magnetic pole having a flat top surface, where a shield layer over the primary magnetic pole and at the sides of the primary magnetic pole is formed in a single piece. The distance in the direction perpendicular to the thickness direction between the side surfaces of the primary magnetic pole and the side shield layer is longer than the distance in the thickness direction between the top surface of the primary magnetic pole and the shield layer.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: July 1, 2008
    Assignee: TDK Corporation
    Inventors: Hisayuki Yazawa, Kiyoshi Kobayashi
  • Patent number: 7372671
    Abstract: A head beam is retained at a front portion of the pivoting arm so as to be rotatable, and is continuously urged by an urging member in the counterclockwise direction. The pivoting arm has a directing rod rotating around a supporting shaft. A slidable projection of the directing rod is slidably in contact with a beam rod, and a fixed supporting point is also slidably in contact with the directing rod. Accordingly, when the pivoting arm rotates, the operational reference line of the magnetic head is oriented along the tangential direction. Due to continuous urging force by the urging member, the direction of the magnetic head is continuously stabilized.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: May 13, 2008
    Assignee: TDK Corporation
    Inventor: Hisayuki Yazawa
  • Patent number: 7370406
    Abstract: A thin film magnetic head is described, the magnetic head having an insulating layer and a protrusion which has an upper portion and a base portion, and the upper portion has an extended portion. The insulating layer is present under the extending part. A method of manufacturing the magnetic head includes forming a first insulating layer around the lower core layer; simultaneously forming a coil layer by plating the lower core layer with a coil insulating underlayer interposed between the lower coil layer and a coil lead layer connected to the coil layer on the first insulating layer; forming a coil insulating layer of an inorganic material on the coil layer and the coil lead layer; and, simultaneously forming a first plating underlayer for forming an upper core layer by plating, a second plating underlayer on the first coil lead layer exposed through the plating-forming opening, and a current-carrying lead layer.
    Type: Grant
    Filed: June 2, 2004
    Date of Patent: May 13, 2008
    Assignee: TDK Corporation
    Inventor: Hisayuki Yazawa
  • Patent number: 7359148
    Abstract: It is an object to provide a thin film magnetic head capable of improving characteristics and properties required of a gap layer by, in particular, appropriately controlling the compositional ratio of a NiPRe alloy used as the gap layer. A NiPRe alloy which has excellent chemical agent resistance, which maintains excellently a non-magnetic state even when heated at a high temperature, and which can suppress the element diffusion at the interface to a magnetic pole layer can be formed through plating by controlling the compositional ratio of the NiPRe alloy used as a gap layer at within the range enclosed by boundary lines A to E in a ternary diagram.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: April 15, 2008
    Assignee: TDK Corporation
    Inventor: Hisayuki Yazawa