Patents by Inventor Tetsuya Mino

Tetsuya Mino 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: 20040080868
    Abstract: An electroplated magnetic thin film consisting of an electroplated film of Fe—Co alloy containing Fe by an amount of 52-86 wt % and having a highly packed fine crystal grain structure, a flat and glossy surface, a high saturation magnetic flux density not less than 2.1 T, a low coercive force of 5-10 Oe, and being particularly suitable as a pole portion of a thin film magnetic head is proposed. The electroplated magnetic thin film is deposited on a substrate by an electroplating process with a pulsatory current or direct current having a current density of 3-120 mA/cm while using an electroplating bath containing one or both of sulfate salt and hydrochloric salt serving as supply sources of Fe ions and Co ions, saccharin sodium serving as a stress relaxation agent by an amount not less than 1 g/l, boric acid as a pH buffer agent, ammonium chloride as an electrically conductivity salt, and sodium lauryl sulfate as a surfactant.
    Type: Application
    Filed: March 3, 2003
    Publication date: April 29, 2004
    Applicant: TDK Corporation
    Inventors: Atsushi Yamaguchi, Tetsuya Mino, Seiji Yari, Shigeru Ichihara
  • Patent number: 6678941
    Abstract: The invention is a method of manufacturing thin film magnetic heads usable for magnetic recording and reproducing drive devices such as magnetic disk drive devices. The method is characterized by forming a first magnetic film in a primary pattern which is larger than its definitive pattern and of which its edges are located within frames which are used in a frame-plating method for a second magnetic film. The second magnetic film is then formed by the frame-plating method and the first magnetic film is etched into its definitive pattern by using the second magnetic film as a mask.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: January 20, 2004
    Assignee: TDK Corporation
    Inventors: Koichi Terunuma, Tetsuya Mino, Katsuya Kanakubo, Noriyuki Ito
  • Patent number: 6654203
    Abstract: In a method of forming a track width defining layer including a magnetic pole portion, a base film is initially formed on a write gap layer. The base film includes a first layer made of a magnetic material having a saturation magnetic flux density of 1.8 T or more, and a second layer formed on the first layer and made of a magnetic material. The magnetic material forming the second layer is a material containing Fe or Ni as a main component and without containing Co. Then, a frame having an opening of a shape matching with the track width defining layer is formed on the second layer. Subsequently, the track width defining layer is formed within the opening by electroplating, using the base film as an electrode.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: November 25, 2003
    Assignee: TDK Corporation
    Inventors: Seiji Yari, Atsushi Yamaguchi, Tetsuya Mino, Kazuo Ishizaki, Jun-ichi Hokushin, Junichi Sato, Kazuya Maekawa
  • Patent number: 6604275
    Abstract: A method of manufacturing a thin-film magnetic head, includes the steps of: forming, on a lower auxiliary pole, a three-layer pole tip structure consisting of a lower pole tip element, a recording gap layer and an upper pole tip element; depositing a lower insulating layer on the three-layer pole tip structure; polishing the lower insulating layer by chemical-mechanical polishing so that a top surface of the lower insulating layer is leveled lower than a top of the three-layer pole tip structure over at least a region within which a coil conductor is formed; forming the coil conductor on the lower insulating layer; forming an upper insulating to cover the coil conductor; and forming an upper auxiliary pole so that a part of which contacts to the upper pole tip element.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: August 12, 2003
    Assignee: TDK Corporation
    Inventors: Tetsuya Mino, Yasufumi Uno, Koji Matsukuma, Koichi Terunuma, Masahiro Kondo
  • Patent number: 6586049
    Abstract: A method of patterning at least one object layer, includes a step of forming a mask on the object layer, and a step of selectively etching the object layer using the mask. The mask is made of a magnetic metallic compound with a basic metal of nickel or cobalt containing at least group 3B element and/or group 5B element.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: July 1, 2003
    Assignee: TDK Corporation
    Inventors: Yasufumi Uno, Toru Inoue, Tetsuya Mino, Koji Matsukuma
  • Patent number: 6532647
    Abstract: A manufacturing method of a composite type thin-film magnetic head with a reading head element and an inductive writing head element, includes a step of forming the reading head element and its lead conductor layers on a first insulation layer, a step of forming a second insulation layer to cover the reading head element and the lead conductor layers, a step of forming a second shield layer on the second insulation layer, a step of forming a third insulation layer, and a step of forming via holes and a back gap hole. The via holes and back gap hole forming step is executed by reactive ion etching (RIE) for simultaneously removing the second insulation layer and the third insulation layer located at the via holes and the third insulation layer located at the back gap hole.
    Type: Grant
    Filed: February 18, 2000
    Date of Patent: March 18, 2003
    Assignee: TDK Corporation
    Inventors: Kazuya Maekawa, Akio Iijima, Tetsuya Mino
  • Publication number: 20030003325
    Abstract: There is disclosed a soft magnetic thin film represented by a composition formula of Feal.Cobl.Ccl.Odl.
    Type: Application
    Filed: May 7, 2002
    Publication date: January 2, 2003
    Applicant: TDK CORPORATION
    Inventors: Tetsuya Mino, Seiji Yari, Atsushi Yamaguchi
  • Publication number: 20020186504
    Abstract: In a method of forming a track width defining layer including a magnetic pole portion, a base film is initially formed on a write gap layer. The base film includes a first layer made of a magnetic material having a saturation magnetic flux density of 1.8 T or more, and a second layer formed on the first layer and made of a magnetic material. The magnetic material forming the second layer is a material containing Fe or Ni as a main component and without containing Co. Then, a frame having an opening of a shape matching with the track width defining layer is formed on the second layer. Subsequently, the track width defining layer is formed within the opening by electroplating, using the base film as an electrode.
    Type: Application
    Filed: August 16, 2001
    Publication date: December 12, 2002
    Applicant: TDK CORPORATION
    Inventors: Seiji Yari, Atsushi Yamaguchi, Tetsuya Mino, Kazuo Ishizaki, Jun-ichi Hokushin, Junichi Sato, Kazuya Maekawa
  • Patent number: 6466415
    Abstract: The invention provides a thin film magnetic head including a first pole portion having depressed portion that is formed therein. The depressed portion descends, backward within the first pole portion, at a first inclination angle &thgr;1 from a first inclination starting point P1. Then, an insulating film is filled up in the depressed portion so that it can be located up to the upper side of the surface of the first pole and have an inclined surface in the side of a medium opposing surface. Additionally, a first magnetic film of a second pole portion can have a larger saturated magnetic flux density than a second magnetic film of the second pole portion, and can include an inclined portion with a second inclination angle &thgr;2 from a second inclination starting point P2.
    Type: Grant
    Filed: June 28, 2000
    Date of Patent: October 15, 2002
    Assignee: TDK Corporation
    Inventors: Koichi Terunuma, Tetsuya Mino, Katsuya Kanakubo, Noriyuki Ito
  • Publication number: 20020135934
    Abstract: A top pole layer in a write head includes, in a pole portion, a first layer having surfaces one of which is adjacent to a write gap layer, a second layer having surfaces one of which is adjacent to the other surface of the first layer, and a third layer having surfaces one of which is adjacent to the other surface of the second layer. The first to third layers have different saturation flux densities such that the closer the layer to the write gap layer, the higher saturation flux density.
    Type: Application
    Filed: August 31, 2001
    Publication date: September 26, 2002
    Applicant: TDK CORPORATION
    Inventors: Tetsuya Mino, Atsushi Yamaguchi, Seiji Yari
  • Publication number: 20020118487
    Abstract: A track width defining layer for defining a write track width of a thin-film magnetic head is made of a CoNiFe film formed through electroplating. The CoNiFe film contains 60 to 75 weight % cobalt, 10 to 20 weight % nickel, and 10 to 20 weight % iron, and has a crystal structure that is a mixture of a body-centered cubic structure phase and a face-centered cubic structure phase, in which Ib/If falls within the range of 0.3 to 0.7 inclusive where Ib represents the intensity of an X-ray diffracted from a (110)-plane of the body-centered cubic structure and If represents the intensity of an X-ray diffracted from a (111)-plane of the face-centered cubic structure. The pH of a plating bath for forming the CoNiFe film through electroplating is adjusted to 3.0 to 4.0 inclusive.
    Type: Application
    Filed: August 31, 2001
    Publication date: August 29, 2002
    Applicant: TDK CORPORATION
    Inventors: Atsushi Yamaguchi, Seiji Yari, Tetsuya Mino, Shuichi Okawa, Shigeru Ichihara
  • Patent number: 6329211
    Abstract: A first magnetic film to constitute a first yoke part and a first pole part is formed in a given pattern on a substrate, and a write gap film is formed on the part corresponding to the first pole portion of the first magnetic film. Then, a second magnetic film having a second pole portion and a second yoke part is formed on the write gap film by a photolithography so that the second pole portion can have a width of 1.5-2.5 &mgr;m. Thereafter, the sides of the second pole portion are etched by an ion beam etching method to narrow its width, and the write gap film is removed by using, as a mask, the second pole portion to expose the first magnetic film. Subsequently, the exposed first magnetic film is partially removed to form the first pole portion and thereby a thin film magnetic head having a pole portion with a track width of not more than 1 &mgr;m beyond the limit of the photolithography is produced.
    Type: Grant
    Filed: September 27, 1999
    Date of Patent: December 11, 2001
    Assignee: TDK Corporation
    Inventors: Koichi Terunuma, Tetsuya Mino, Katsuya Kanakubo, Osamu Matsuda
  • Publication number: 20010019035
    Abstract: A method of patterning at least one object layer, includes a step of forming a mask on the object layer, and a step of selectively etching the object layer using the mask. The mask is made of a magnetic metallic compound with a basic metal of nickel or cobalt containing at least group 3B element and/or group 5B element.
    Type: Application
    Filed: December 11, 2000
    Publication date: September 6, 2001
    Applicant: TDK Corporation of Tokyo, Japan
    Inventors: Yasufumi Uno, Toru Inoue, Tetsuya Mino, Koji Matsukuma
  • Publication number: 20010000446
    Abstract: A thin-film magnetic head includes an ABS and a three-layer pole tip structure located between the ABS and a position at a predetermined height from the ABS. The structure consists of a first pole, a recording gap layer and a second pole. The recording gap layer is made of a material having a etching rate equal to or higher than that of a material for making the first and second poles.
    Type: Application
    Filed: December 13, 2000
    Publication date: April 26, 2001
    Applicant: TDK Corporation
    Inventor: Tetsuya Mino
  • Patent number: 6188544
    Abstract: A thin-film magnetic head includes an ABS and a three-layer pole tip structure located between the ABS and a position at a predetermined height from the ABS. The structure consists of a first pole, a recording gap layer and a second pole. The recording gap layer is made of a material having a etching rate equal to or higher than that of a material for making the first and second poles.
    Type: Grant
    Filed: September 9, 1998
    Date of Patent: February 13, 2001
    Assignee: TDK Corporation
    Inventor: Tetsuya Mino
  • Patent number: 6188543
    Abstract: A thin film magnetic head includes a recording gap layer, and lower and upper magnetic pole layers made of polycrystalline magnetic substances, deposited to sandwich the recording gap layer. An average particle size D of crystal substances at least in a region of the upper magnetic pole layer, near the recording gap layer with respect to a recording track width W is set to D≦W/20.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: February 13, 2001
    Assignee: TDK Corporation
    Inventors: Koichi Terunuma, Yasufumi Uno, Tetsuya Mino, Koji Matsukuma
  • Patent number: 6178065
    Abstract: A thin film magnetic head has a recording gap layer made of a nonmagnetic material, lower and upper magnetic pole layers made of a magnetic material, the lower and upper magnetic pole layers sandwiching the recording gap layer, and a magnetic material side layer deposited via a nonmagnetic material side layer on at least a part of a side surface of at least the upper magnetic pole layer.
    Type: Grant
    Filed: May 21, 1998
    Date of Patent: January 23, 2001
    Assignee: TDK Corporation
    Inventors: Koichi Terunuma, Yasufumi Uno, Tetsuya Mino, Koji Matsukuma
  • Patent number: 6169642
    Abstract: A thin-film magnetic head having an air bearing surface, includes a three-layer pole tip structure consisting of a lower pole tip element, a recording gap layer and an upper pole tip element, the structure having side surfaces, a rear surface and top surface, a lower auxiliary pole, a part of which contacts to the lower pole tip element, an upper auxiliary pole, a part of which contacts to the upper pole tip element, the upper auxiliary pole being magnetically connected at its rear portion with respect to the air bearing surface to the lower auxiliary pole so as to form a yoke together with the lower auxiliary pole, a lower insulating layer, surrounding the side surfaces and the rear surfaces of the three-layer pole tip structure, the lower insulating layer being located between the lower and upper auxiliary poles and having a top surface, a coil conductor formed on the top surface of the lower insulating layer, and an upper insulating layer covering the coil conductor, a part of the upper insulating layer be
    Type: Grant
    Filed: September 9, 1998
    Date of Patent: January 2, 2001
    Assignee: TDK Corporation
    Inventors: Tetsuya Mino, Yasufumi Uno, Koji Matsukuma, Koichi Terunuma, Masahiro Kondo
  • Patent number: 6151193
    Abstract: A first pole tip 212 at a write element 2 is provided projecting above a first yoke 211. A second pole tip 222 is adhered onto a gap film 23 that is adhered onto the first pole tip 212. The front end portion of a second yoke 221 is laminated on the second pole tip 222. At least either the first pole tip 212 or the second pole tip 222 is constituted of a material having a higher saturation magnetic flux density than that of permalloy. At least either the first yoke 211 or the second yoke 221 is constituted of a material having a higher resistivity than that of permalloy.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: November 21, 2000
    Assignee: TDK Corporation
    Inventors: Koichi Terunuma, Yasufumi Uno, Tetsuya Mino, Koji Matsukuma
  • Patent number: 6047462
    Abstract: A magnetoresistive (MR) conversion element and an inductive conversion element are provided as parts of a combined type thin film magnetic head. The MR element is formed by placing a magnetoresistive film in an insulation layer between a first magnetic shield film and a second magnetic shield film. The inductive conversion element is in part formed by laminating a gap film with a coil film supported by an insulating film on the second magnetic shield film. The width of the first magnetic film is then made smaller than the width of the second magnetic shield film to form a pole of the inductive conversion element. The inductive conversion element is further formed to include a first magnetic film separated from the second magnetic shield film by a non-magnetic film which has a thickness to insure magnetic coupling between the second magnetic shield film and the first magnetic film while minimizing fringing effects.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: April 11, 2000
    Assignee: TDK Corporation
    Inventors: Daisuke Miyauchi, Tetsuya Mino