Patents by Inventor Masakazu Hirata

Masakazu Hirata 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: 11225079
    Abstract: There are provided a head chip and so on capable of improving the print image quality while suppressing the manufacturing cost. The head chip according to an embodiment of the present disclosure includes an actuator plate having a plurality of ejection grooves, a nozzle plate having a plurality of nozzle holes, and a cover plate having a first through hole, a second through hole, and a wall part. The plurality of nozzle holes includes a plurality of first nozzle holes arranged so as to be shifted toward the first through hole, and a plurality of second nozzle holes arranged so as to be shifted toward the second through hole. In a first ejection groove communicated with the first nozzle hole, a first cross-sectional area of a part communicated with the first through hole is smaller than a second cross-sectional area of a part communicated with the second through hole.
    Type: Grant
    Filed: November 25, 2020
    Date of Patent: January 18, 2022
    Assignee: SII PRINTEK INC.
    Inventors: Masakazu Hirata, Kenji Suzuki, Masanori Tamura
  • Publication number: 20210162754
    Abstract: There are provided a head chip and so on capable of improving the print image quality. The head chip according to an embodiment of the present disclosure is provided with an actuator plate having a plurality of ejection grooves and a nozzle plate having a plurality of nozzle holes individually communicated with the plurality of ejection grooves. The plurality of ejection grooves is arranged side by side so as to at least partially overlap each other along a predetermined direction. Further, the nozzle holes adjacent to each other along the predetermined direction out of the plurality of nozzle holes are arranged so as to be shifted from each other along an extending direction of the ejection grooves in the nozzle plate.
    Type: Application
    Filed: November 24, 2020
    Publication date: June 3, 2021
    Inventors: Tomoki Ai, Yuki Yamamura, Masakazu Hirata, Kenji Suzuki
  • Publication number: 20210162756
    Abstract: There are provided a head chip and so on capable of improving the print image quality while suppressing the manufacturing cost. The head chip according to an embodiment of the present disclosure includes an actuator plate having a plurality of ejection grooves, a nozzle plate having a plurality of nozzle holes, and a cover plate having a first through hole, a second through hole, and a wall part. The plurality of nozzle holes includes a plurality of first nozzle holes arranged so as to be shifted toward the first through hole, and a plurality of second nozzle holes arranged so as to be shifted toward the second through hole. In a first ejection groove communicated with the first nozzle hole, a first cross-sectional area of a part communicated with the first through hole is smaller than a second cross-sectional area of a part communicated with the second through hole.
    Type: Application
    Filed: November 25, 2020
    Publication date: June 3, 2021
    Inventors: Masakazu HIRATA, Kenji SUZUKI, Masanori TAMURA
  • Publication number: 20210162757
    Abstract: There is provided a head chip and so on capable of achieving the reduction in power consumption and the improvement in print image quality while suppressing the manufacturing cost of the head chip. The head chip according to an embodiment of the present disclosure includes an actuator plate having a plurality of ejection grooves and a plurality of electrodes, a nozzle plate having a plurality of nozzle holes, and a cover plate having a wall part, a first through hole, and a second through hole. The plurality of nozzle holes includes a plurality of first nozzle holes arranged so as to be shifted toward the first through hole, and a plurality of second nozzle holes arranged so as to be shifted toward the second through hole. In a first ejection groove communicated with the first nozzle hole, a first cross-sectional area of a part communicated with the first through hole is smaller than a second cross-sectional area of a part communicated with the second through hole.
    Type: Application
    Filed: November 25, 2020
    Publication date: June 3, 2021
    Inventors: Masakazu HIRATA, Yuzuru KUBOTA, Yuki YAMAMURA, Tomoki AI
  • Patent number: 10814630
    Abstract: Provided herein are a jet hole plate, a liquid jet head, a liquid jet recording apparatus, and a method for manufacturing a jet hole plate that can achieve a long life. A jet hole plate according to an embodiment of the present disclosure is a jet hole plate for use in a liquid jet head. The jet hole plate includes a metal substrate having provided therein a plurality of jet holes. The metal substrate has a principal surface having outlets for the jet holes. The principal surface has a surface roughness (arithmetic mean roughness Ra) that is smaller in outlet edge regions of the jet holes than in surrounding regions around the outlet edge regions.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: October 27, 2020
    Assignee: SII PRINTEK INC.
    Inventors: Masakazu Hirata, Kenji Takano, Tomoki Sodetai
  • Patent number: 10710366
    Abstract: Provided herein are a jet hole plate, a liquid jet head, and a liquid jet recording apparatus that can achieve a long life. A jet hole plate according to an embodiment of the present disclosure is a jet hole plate for use in a liquid jet head. The jet hole plate includes a metal substrate provided with a plurality of jet holes. In the metal substrate, an average crystal grain size in outlet edges of the jet holes is smaller than that in surrounding regions around the outlet edges.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: July 14, 2020
    Assignee: SII Printek Inc.
    Inventors: Masakazu Hirata, Kenji Takano, Emiko Osaka
  • Publication number: 20190143693
    Abstract: Provided herein is a method for manufacturing a jet hole plate that can improve ejection stability and head durability. A method for manufacturing a jet hole plate according to an embodiment of the present disclosure includes a punching step of pressing a first principal surface of a metal substrate with a punch to form an indentation in the first principal surface, and to form a raised portion in a second principal surface of the metal substrate at a position opposite to the indentation; a first polishing step of removing the raised portion by mechanical polishing to penetrate the metal substrate at the indentation to thereby form a jet hole; and a second polishing step of polishing at least one of the first principal surface and the second principal surface of the metal substrate by chemical polishing, electrolytic polishing, or chemical-mechanical polishing.
    Type: Application
    Filed: November 13, 2018
    Publication date: May 16, 2019
    Inventors: Emiko OSAKA, Masakazu HIRATA, Shutaro YAMAMOTO, Kenji TAKANO, Takashi HITOMI
  • Publication number: 20190143686
    Abstract: Provided herein are a jet hole plate, a liquid jet head, and a liquid jet recording apparatus that can achieve a long life. A jet hole plate according to an embodiment of the present disclosure is a jet hole plate for use in a liquid jet head. The jet hole plate includes a metal substrate provided with a plurality of jet holes. In the metal substrate, an average crystal grain size in outlet edges of the jet holes is smaller than that in surrounding regions around the outlet edges.
    Type: Application
    Filed: November 13, 2018
    Publication date: May 16, 2019
    Inventors: Masakazu HIRATA, Kenji TAKANO, Emiko OSAKA
  • Publication number: 20190143692
    Abstract: Provided herein are a jet hole plate, a liquid jet head, a liquid jet recording apparatus, and a method for manufacturing a jet hole plate that can achieve a long life. A jet hole plate according to an embodiment of the present disclosure is a jet hole plate for use in a liquid jet head. The jet hole plate includes a metal substrate having provided therein a plurality of jet holes. The metal substrate has a principal surface having outlets for the jet holes. The principal surface has a surface roughness (arithmetic mean roughness Ra) that is smaller in outlet edge regions of the jet holes than in surrounding regions around the outlet edge regions.
    Type: Application
    Filed: November 13, 2018
    Publication date: May 16, 2019
    Inventors: Masakazu HIRATA, Kenji TAKANO, Tomoki SODETAI
  • Patent number: 8982494
    Abstract: A head gimbal assembly has a suspension configured to extend along a surface of a recording medium and to bend and deform in a thickness direction of the recording medium. A slider is provided on a front end side of the suspension so as to confront the surface of the recording medium. A support section supports the slider such that the slider can pivot about two axes parallel to the surface of the recording medium and perpendicular to each other. An optical waveguide is connected to the slider and is configured to introduce a light flux into the slider. A near-field light generating element generates near-field light from the optical flux and causes the near-field light to record information on the recording medium. A positioning section is mounted between the support section and the slider for positioning the optical waveguide relative to the slider.
    Type: Grant
    Filed: July 10, 2009
    Date of Patent: March 17, 2015
    Assignee: Seiko Instruments Inc.
    Inventors: Masakazu Hirata, Manabu Oumi, Majung Park, Sachiko Tanabe
  • Patent number: 8945733
    Abstract: A magnetic recording medium in which information can be recorded using a heat-assisted magnetic recording method comprises a recording layer formed on a substrate. The recording layer has a plurality of magnetic recording bit regions and a plurality of high thermal conductors each extending inside a corresponding one of the bit regions. The high thermal conductors have a thermal conductivity higher than that of the recording layer and assist in dissipating heat energy imparted to the bit regions during the recording of information.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: February 3, 2015
    Assignee: Seiko Instruments Inc.
    Inventors: Yoshikazu Tanaka, Norio Chiba, Manabu Oumi, Masakazu Hirata, Yoko Shinohara, Sachiko Tanabe
  • Patent number: 8905805
    Abstract: A U-shaped groove and a V-shaped groove are formed onto a cladding disposed on a substrate, a core and a metal structure are formed inside the grooves, respectively, and then the substrate surface is planarized. Further, after a cladding is formed again, the substrate is cut and the cut surface is polished such that the metal structure inside the V-shaped groove has a predetermined thickness, thereby forming a scattering body.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: December 9, 2014
    Assignee: Seiko Instruments Inc.
    Inventors: Yoko Shinohara, Norio Chiba, Manabu Oumi, Masakazu Hirata, Sachiko Tanabe, Yoshikazu Tanaka
  • Patent number: 8842504
    Abstract: A near-field light head of the present invention includes: a slider disposed opposite to a surface of the magnetic recording medium; a recording element that includes a main magnetic pole generating the recording magnetic field and a subsidiary magnetic pole, the recording element being fixed to an apical surface of the slider so that the main magnetic pole and the subsidiary magnetic pole line up in a longitudinal direction of the slider in the state where the subsidiary magnetic pole is located at the apical surface of the slider; a near-field light generating element, fixed adjacently to the main magnetic pole in a state where another end side thereof is directed to the magnetic recording medium, that propagates the light flux introduced from one end side thereof toward the other end side to generate the near-field light, and radiates the near-field light from the other end side to the outside; and a light flux introducing device, fixed to the slider, that introduces the light flux from the one end side in
    Type: Grant
    Filed: July 10, 2008
    Date of Patent: September 23, 2014
    Assignee: Seiko Instruments Inc.
    Inventors: Masakazu Hirata, Manabu Oumi, Majung Park
  • Patent number: 8787127
    Abstract: A near-field light generating element has a core that propagates light flux from a light incident side to a light emission side while focusing the propagating light flux. A near-field light generating portion in the form of a metal film generates near-field light from the light flux. The core includes a first core, and a second core covering a side surface of the first core, and the core is formed in a polygonal shape when viewed from a Z direction. The metal film is placed on a side surface in the core, and is formed so that a width of an interface between the metal film and the core is narrower than a width of the side surface of the core.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: July 22, 2014
    Assignee: Seiko Instruments Inc.
    Inventors: Masakazu Hirata, Norio Chiba, Manabu Oumi, Yoko Shinohara, Sachiko Tanabe, Yoshikazu Tanaka
  • Patent number: 8755255
    Abstract: A method of manufacturing a near-field light generating element includes a first cladding forming process of forming a first cladding on a substrate, a near-field light generation portion forming process of forming a metal film base material on the first cladding, a core forming process of forming a core base material so as to cover the metal film base material, a single patterning process of collectively patterning the core base material and the metal film base material to form the core and the metal film, respectively, and a second cladding forming process of forming a second cladding so as to interpose the core between the second cladding and the first cladding.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: June 17, 2014
    Assignee: Seiko Instruments Inc.
    Inventors: Masakazu Hirata, Manabu Oumi
  • Patent number: 8599654
    Abstract: A head gimbal assembly has a flexure forming a part of a suspension configured to extend along a surface of a recording medium. A flexible substrate is provided on the flexure. A slider is mounted onto at least a part of the flexible substrate so as to oppose the surface of the recording medium, and is configured to generate near field light from an introduced light flux. A light supply portion is mounted on the flexure and is provided between the flexure and the slider. The flexible substrate has an end surface forming a mirror surface that faces an end surface of the light supply portion and is inclined with respect to an optical axis of the light supply portion. The light supply portion is optically coupled to the slider via the mirror surface of the flexible substrate.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: December 3, 2013
    Assignee: Seiko Instruments Inc.
    Inventors: Masakazu Hirata, Manabu Oumi, Norio Chiba, Sachiko Tanabe, Yoko Shinohara
  • Patent number: 8542559
    Abstract: An information recording and reproduction apparatus has a magnetic recording medium and a carriage that undergoes rotational movement about a pivot shaft and has a base portion and an arm portion extending from the base portion and along a surface of the medium. A light source that emits a light beam to heat the medium is mounted on the base portion and is disposed closer to the pivot shaft than the arm portion. The arm portion supports a slider confronting the surface of the medium and being configured to receive a light beam from the light source. The slider has an optical system which condenses the light beam and a spot light generating element which generates from the condensed light beam spot light that heats the medium for recording information on the medium while causing magnetization reversal by applying a recording magnetic field to the medium.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: September 24, 2013
    Assignee: Seiko Instruments Inc.
    Inventors: Masakazu Hirata, Manabu Oumi, Mizuaki Suzuki, Majung Park
  • Patent number: 8537646
    Abstract: An information recording and reproduction apparatus has a magnetic recording medium, a light source that outputs a light beam to heat the medium, and a near-field light head confronting a surface of the medium. An optical waveguide introduces a light beam from the light source into the head to generate near-field light. A control section supplies a current to a recording element of the head for generating a recording magnetic field in a direction of the medium. A photoelectric composite wiring line has the optical waveguide and electric wiring lines integral with the optical waveguide. The optical waveguide is arranged between the electric wiring lines. The optical waveguide and the electric wiring line branch off from a distal side of the photoelectric composite wiring line so that the optical waveguide is routed to a base end surface of the near-field light head in a state extending approximately linearly.
    Type: Grant
    Filed: May 19, 2009
    Date of Patent: September 17, 2013
    Assignee: Seiko Instruments Inc.
    Inventors: Masakazu Hirata, Manabu Oumi, Mizuaki Suzuki, Majung Park
  • Patent number: D784735
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: April 25, 2017
    Assignees: FUJI ELECTRIC CO., LTD., SEVEN-ELEVEN JAPAN CO., LTD.
    Inventor: Masakazu Hirata
  • Patent number: D860705
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: September 24, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Masakazu Hirata, Takayuki Tsutsui, Hiroyuki Toyoda