Patents by Inventor Nozomu Hachisuka

Nozomu Hachisuka 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: 9372243
    Abstract: The magnetic sensor of the invention comprises a base portion, a sensor chip positioned on the base portion, a wiring portion adapted to electrically connect a terminal of the sensor chip to a connecting lead, a resin having a low elastic modulus for coating at least the sensor chip, and a resin having a high elastic modulus for coating at least the low elastic-modulus resin and the wiring portion, wherein the sensor chip includes a magneto-resistive effect device, and the low elastic-modulus resin has an elastic modulus ranging from 10 kPa to 80 MPa while the high elastic-modulus resin has an elastic modulus of 1 GPa or more, and enables the sensor chip to perform well in a good state although having a structure of sealing up the sensor chip with the resin member.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: June 21, 2016
    Assignee: TDK CORPORATION
    Inventors: Yoshimitsu Wada, Nozomu Hachisuka, Yoshihiro Kudo, Jun Ono, Nobutaka Nishio
  • Publication number: 20150054498
    Abstract: The magnetic sensor of the invention comprises a base portion, a sensor chip positioned on the base portion, a wiring portion adapted to electrically connect a terminal of the sensor chip to a connecting lead, a resin having a low elastic modulus for coating at least the sensor chip, and a resin having a high elastic modulus for coating at least the low elastic-modulus resin and the wiring portion, wherein the sensor chip includes a magneto-resistive effect device, and the low elastic-modulus resin has an elastic modulus ranging from 10 kPa to 80 MPa while the high elastic-modulus resin has an elastic modulus of 1 GPa or more, and enables the sensor chip to perform well in a good state although having a structure of sealing up the sensor chip with the resin member.
    Type: Application
    Filed: July 18, 2014
    Publication date: February 26, 2015
    Inventors: Yoshimitsu WADA, Nozomu HACHISUKA, Yoshihiro KUDO, Jun ONO, Nobutaka NISHIO
  • Patent number: 8154826
    Abstract: Provided is a thin-film magnetic head in which the magnetic spacing can be appropriately controlled by dynamically and accordingly, by adjusting the pressure working between the thin-film magnetic head and the magnetic recording medium according to the change of conditions such as the change over time. The thin-film magnetic head comprises at least one cavity for adjusting a pressure working between the thin-film magnetic head and the magnetic recording medium, provided in a surface of the head opposed to the magnetic recording medium, and a volume of the at least one cavity being variable. When the magnetic recording medium passes through near the cavity, the cavity generates a (negative) pressure that attracts the head and the medium toward each other. The amount of the negative pressure depends on the volume of the cavity; thus, a magnetic spacing dMS can be controlled dynamically and accordingly by adjusting the volume.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: April 10, 2012
    Assignee: TDK Corporation
    Inventor: Nozomu Hachisuka
  • Patent number: 8130473
    Abstract: A multi-channel thin-film magnetic head includes a substrate, a plurality of MR read head elements, a plurality of first resistive elements, and a second resistive element. Each MR read head element includes a lower magnetic shield layer, an upper magnetic shield layer, and an MR layer arranged between the lower magnetic shield layer and the upper magnetic shield layer. Each first resistive element has a first resistance value. One ends of the first resistive elements are connected to the lower magnetic shield layers or the upper magnetic shield layers of the MR read head elements, respectively. The second resistive element has a second resistance value that is higher than the first resistance value. One end of the second resistive element is commonly connected to the other ends of the plurality of first resistive elements. The other end of the second resistive element is grounded.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: March 6, 2012
    Assignee: TDK Corporation
    Inventor: Nozomu Hachisuka
  • Patent number: 8085496
    Abstract: Provided is a thin-film magnetic head for reading data from a magnetic recording medium and/or writing data to a magnetic recording medium, in which the magnetic spacing can be controlled appropriately by stably adjusting the pressure working between the thin-film magnetic head and the magnetic recording medium according to the change of conditions such as the change over time. This thin-film magnetic head comprises at least one through hole reaching a surface opposed to the magnetic recording medium of the thin-film magnetic head, for adjusting a pressure working between the thin-film magnetic head and the magnetic recording medium. Preferably, the head further comprises at least one flow-amount control means for controlling the flow amount of gas that flows via the at least one through hole.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: December 27, 2011
    Assignee: TDK Corporation
    Inventors: Nozomu Hachisuka, Naoki Ohta
  • Patent number: 8081398
    Abstract: Provided is a thin-film magnetic head, in which the magnetic spacing can be controlled appropriately, regardless of the presence of the variation in height of the medium-opposed surface of the closure. The thin-film magnetic head includes: at least one head element formed on or above an element-formation surface of a substrate, for reading data from a magnetic recording medium and/or writing data to a magnetic recording medium; an overcoat layer formed on the element-formation surface so as to cover the at least one head element; and at least one closure adhered to at least a portion of an upper surface of the overcoat layer. Here, at least one of the at least one closure includes at least one element for adjusting the height of a medium-opposed surface of the closure. The element is preferably a heating element provided within the closure.
    Type: Grant
    Filed: April 9, 2008
    Date of Patent: December 20, 2011
    Assignee: TDK Corporation
    Inventor: Nozomu Hachisuka
  • Patent number: 8035919
    Abstract: A multi-channel thin-film magnetic head includes a substrate, a plurality of thin-film magnetic head elements formed on the substrate, a closure fixed onto the plurality of thin-film magnetic head elements, a protection film laminated on a whole area of a TBS of the plurality of thin-film magnetic head elements and the closure, and many micro-grooves formed in a surface of the protection film.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: October 11, 2011
    Assignee: TDK Corporation
    Inventors: Seiji Yari, Yasufumi Uno, Yuji Ito, Hideaki Sato, Nozomu Hachisuka
  • Patent number: 8021712
    Abstract: The present invention relates to a wafer formed with an evaluation element and capable of improving productivity and a manufacturing method of an electronic component using the same. In a wafer according to the present invention, a plurality of elements connected to electrode films through lead-out conductive films are arranged and a chip area is defined for cutting out the plurality of elements in a given number. In the wafer, at least one evaluation element is formed in an area outside the chip area. The lead-out conductive films extend to the outside area and are connected to the evaluation elements. With this wafer, since the lead-out conductor is shared between the element and the evaluation element, the electrode film connected therewith can be shared, too.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: September 20, 2011
    Assignee: TDK Corporation
    Inventors: Osamu Nakazawa, Nozomu Hachisuka, Tetsuya Hiraki
  • Patent number: 8009386
    Abstract: A magnetic tape head has a base substrate, a magnetic head layer formed on the base substrate, and a closure piece formed on the magnetic head layer. The distance from a first plane comprising a point on the tape bearing surface of the base substrate to a third plane comprising a point on the tape bearing surface of the closure piece is equal to or greater than the distance from the first plane to a second plane comprising a point on the tape bearing surface of the magnetic head layer.
    Type: Grant
    Filed: November 26, 2007
    Date of Patent: August 30, 2011
    Assignee: TDK Corporation
    Inventor: Nozomu Hachisuka
  • Patent number: 7911743
    Abstract: Provided is a multichannel thin-film magnetic head having a plurality of read head elements neighboring with each other, each of which includes shield layers having a desired stable magnetic-domain structure. The head comprises at least one read head part comprising a plurality of read head elements aligned in the track width direction, wherein each of the plurality of read head elements comprises a lower shield layer and an upper shield layer, and the at least one read head part comprises: a lower shield part comprising a plurality of the lower shield layers aligned in the track width direction; and an upper shield part comprising a plurality of the upper shield layers aligned in the track width direction, and wherein dummy shield layers are provided respectively on both sides of at least the lower shield part.
    Type: Grant
    Filed: September 4, 2007
    Date of Patent: March 22, 2011
    Assignee: TDK Corporation
    Inventors: Nozomu Hachisuka, Yoshiyuki Mizoguchi, Hiroshi Yamazaki, Hideaki Sato
  • Patent number: 7898765
    Abstract: Provided is a thin-film magnetic head that can be adequately contacted with the magnetic recording medium, and thus, can perform read and write operations sufficiently and stably. This head comprises: at least one magnetic head element for reading and/or writing data, formed on/above an element formation surface of a substrate; an overcoat layer formed so as to cover the at least one magnetic head element; and a closure adhered on at least a portion of an upper surface of the overcoat layer, wherein a groove, extending in a track width direction, is provided on a medium-opposed surface: in an area on an end surface of the substrate, the area being on a boundary between the substrate and the overcoat layer; or in an area covering end surface portions of the substrate and the overcoat layer, the area thus overlapping the boundary between the substrate and the overcoat layer.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: March 1, 2011
    Assignee: TDK Corporation
    Inventor: Nozomu Hachisuka
  • Publication number: 20100237345
    Abstract: The present invention relates to a wafer formed with an evaluation element and capable of improving productivity and a manufacturing method of an electronic component using the same. In a wafer according to the present invention, a plurality of elements connected to electrode films through lead-out conductive films are arranged and a chip area is defined for cutting out the plurality of elements in a given number. In the wafer, at least one evaluation element is formed in an area outside the chip area. The lead-out conductive films extend to the outside area and are connected to the evaluation elements. With this wafer, since the lead-out conductor is shared between the element and the evaluation element, the electrode film connected therewith can be shared, too.
    Type: Application
    Filed: March 18, 2009
    Publication date: September 23, 2010
    Applicant: TDK CORPORATION
    Inventors: Osamu NAKAZAWA, Nozomu HACHISUKA, Tetsuya HIRAKI
  • Publication number: 20100196739
    Abstract: The present invention relates to a magnetic head which can be kept in stable contact with a magnetic tape and has improved production efficiency, a manufacturing method therefor, and a magnetic tape device. The magnetic head according to the present invention includes a substrate and two auxiliary members, having a tape bearing surface to be in sliding contact with a magnetic tape. Reproducing and recording elements in alignment with each other along a tape running direction are arranged in the substrate along a tape width direction. The two auxiliary members are joined to two ends, respectively, of the substrate, constituting the tape bearing surface together with the substrate. The substrate or the two auxiliary members are formed with slopes extending from join-faces between the substrate and the two auxiliary members to the tape bearing surface to make clearances for the magnetic tape.
    Type: Application
    Filed: February 5, 2009
    Publication date: August 5, 2010
    Applicant: TDK CORPORATION
    Inventors: Nozomu Hachisuka, Yoshiyuki Mizoguchi
  • Patent number: 7742260
    Abstract: A magnetic head assembly includes a magnetic head slider with an element-formed surface on which at least one MR read head element is formed, an ABS to be opposed in operation to a magnetic recording medium and a fixing surface that is the other side of the ABS, and a support for supporting the magnetic head slider. The fixing surface of the magnetic head slider is fixed to the support by at least cure-shrinkage resin material layer providing a contractive force when cured. The cure-shrinkage resin material layer has at least one strip-shaped pattern running along a track width direction.
    Type: Grant
    Filed: August 31, 2006
    Date of Patent: June 22, 2010
    Assignee: TDK Corporation
    Inventors: Naoki Ohta, Nozomu Hachisuka
  • Publication number: 20100149685
    Abstract: A multi-channel thin-film magnetic head includes a substrate, a plurality of thin-film magnetic head elements formed on the substrate, a closure fixed onto the plurality of thin-film magnetic head elements, a protection film laminated on a whole area of a TBS of the plurality of thin-film magnetic head elements and the closure, and many micro-grooves formed in a surface of the protection film.
    Type: Application
    Filed: December 15, 2008
    Publication date: June 17, 2010
    Applicant: TDK CORPORATION
    Inventors: Seiji YARI, Yasufumi UNO, Yuji ITO, Hideaki SATO, Nozomu HACHISUKA
  • Publication number: 20100110582
    Abstract: A multi-channel thin-film magnetic head includes a substrate, a plurality of MR read head elements, a plurality of first resistive elements, and a plurality of second resistive elements. Each MR read head element includes a lower magnetic shield layer, an upper magnetic shield layer, and an MR layer arranged between the lower magnetic shield layer and the upper magnetic shield layer. Each first resistive element has a first resistance value. One ends of the plurality of first resistive elements are connected to the lower magnetic shield layers or the upper magnetic shield layers of the plurality of MR read head elements, respectively. Each second resistive element has a second resistance value that is higher than the first resistance value. One ends of the plurality of second resistive elements are commonly connected to the other ends of the plurality of first resistive elements. The other ends of the plurality of second resistive elements are grounded.
    Type: Application
    Filed: October 30, 2008
    Publication date: May 6, 2010
    Applicant: TDK CORPORATION
    Inventor: Nozomu Hachisuka
  • Publication number: 20090310248
    Abstract: Provided is a thin-film magnetic head in which the magnetic spacing can be appropriately controlled by dynamically and accordingly, by adjusting the pressure working between the thin-film magnetic head and the magnetic recording medium according to the change of conditions such as the change over time. The thin-film magnetic head comprises at least one cavity for adjusting a pressure working between the thin-film magnetic head and the magnetic recording medium, provided in a surface of the head opposed to the magnetic recording medium, and a volume of the at least one cavity being variable. When the magnetic recording medium passes through near the cavity, the cavity generates a (negative) pressure that attracts the head and the medium toward each other. The amount of the negative pressure depends on the volume of the cavity; thus, a magnetic spacing dMS can be controlled dynamically and accordingly by adjusting the volume.
    Type: Application
    Filed: June 16, 2008
    Publication date: December 17, 2009
    Applicant: TDK CORPORATION
    Inventor: Nozomu HACHISUKA
  • Publication number: 20090257143
    Abstract: Provided is a thin-film magnetic head, in which the magnetic spacing can be controlled appropriately, regardless of the presence of the variation in height of the medium-opposed surface of the closure. The thin-film magnetic head comprises: at least one head element formed on or above an element-formation surface of a substrate, for reading data from a magnetic recording medium and/or writing data to a magnetic recording medium; an overcoat layer formed on the element-formation surface so as to cover the at least one head element; and at least one closure adhered to at least a portion of an upper surface of the overcoat layer. Here, at least one of the at least one closure comprises at least one height-adjusting means for adjusting the height of a medium-opposed surface of the closure. The height-adjusting means is preferably a heating means provided within the closure.
    Type: Application
    Filed: April 9, 2008
    Publication date: October 15, 2009
    Applicant: TDK CORPORATION
    Inventor: Nozomu HACHISUKA
  • Publication number: 20090237833
    Abstract: Provided is a magnetic tape apparatus using perpendicular magnetic recording, which has the function corresponding to an soft-magnetic under layer with sufficiently large thickness and enables the magnetic tape to maintain life sufficiently. This magnetic tape apparatus comprises: a tape head comprising at least one write head element for perpendicular magnetic recording; and a soft-magnetic capstan belt having a surface contact with the magnetic tape and pressing the magnetic tape to the tape head at least during recording, for controlling running speed of the magnetic tape by causing the magnetic tape to run together with the soft-magnetic capstan belt. Further it is preferable that at least two capstan-belt axes are further provided, and the soft-magnetic capstan belt is a loop running among the at least two capstan-belt axes.
    Type: Application
    Filed: March 19, 2008
    Publication date: September 24, 2009
    Applicant: TDK CORPORATION
    Inventors: Hideaki SATO, Naoki OHTA, Hiraku HIRABAYASHI, Nozomu HACHISUKA, Noriaki KASAHARA
  • Publication number: 20090185314
    Abstract: Provided is a thin-film magnetic head that can be adequately contacted with the magnetic recording medium, and thus, can perform read and write operations sufficiently and stably. This head comprises: at least one magnetic head element for reading and/or writing data, formed on/above an element formation surface of a substrate; an overcoat layer formed so as to cover the at least one magnetic head element; and a closure adhered on at least a portion of an upper surface of the overcoat layer, wherein a groove, extending in a track width direction, is provided on a medium-opposed surface: in an area on an end surface of the substrate, the area being on a boundary between the substrate and the overcoat layer; or in an area covering end surface portions of the substrate and the overcoat layer, the area thus overlapping the boundary between the substrate and the overcoat layer.
    Type: Application
    Filed: January 17, 2008
    Publication date: July 23, 2009
    Applicant: TDK CORPORATION
    Inventor: Nozomu HACHISUKA