Patents by Inventor Hajime Nakao

Hajime Nakao 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: 20210060940
    Abstract: A liquid ejecting apparatus includes a first head unit having a first head provided with a plurality of first nozzles and a second head unit having a second head provided with a plurality of second nozzles and a third head provided at a position different from the second head in a first direction and provided with a plurality of third nozzles. The second head and the third head are provided at different positions in a second direction intersecting with the first direction, and the first head unit and the second head unit are disposed such that a width at which the first head and the second head overlap in the first direction is smaller than a width at which the second head and the third head overlap in the first direction.
    Type: Application
    Filed: August 27, 2020
    Publication date: March 4, 2021
    Inventors: Hiroyuki HAGIWARA, Hajime NAKAO
  • Patent number: 10525707
    Abstract: A liquid ejecting head includes a flow path forming substrate, a vibration plate that is formed on one surface side of the flow path forming substrate, a plurality of piezoelectric elements that are provided on the vibration plate, a protective substrate that is bonded to the one surface side of the flow path forming substrate and has a flow path, a flow path member that is bonded to a side of the protective substrate opposite to the flow path forming substrate, a drive circuit that is mounted in a space formed so as to be surrounded by the flow path forming substrate, the protective substrate, and the flow path member, a filler that is filled between the drive circuit and the protective substrate, and a protective film that is formed on an inner wall, in which the protective film has an exposure hole exposing a surface of the filler.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: January 7, 2020
    Assignee: Seiko Epson Corporation
    Inventors: Masao Nakayama, Shunya Fukuda, Eiju Hirai, Shiro Yazaki, Hajime Nakao
  • Patent number: 10479078
    Abstract: A flow path forming substrate in which an individual flow path which communicates with a nozzle opening that discharges liquid is formed; and a communication plate in which a recess portion which configures at least a part of a common flow path that is common to and communicates with the plurality of individual flow paths is provided to be open on a side opposite to the flow path forming substrate, are provided, the recess portion includes a first recess portion, and a second recess portion which is deeper than the first recess portion, the communication plate includes a supply path which is provided to be open on a bottom surface of the first recess portion, communicates with the recess portion and the individual flow path, and becomes a throttle portion that throttles a flow path with respect to the individual flow path, and a communication path which communicates with the individual flow path and the nozzle opening, and in the individual flow path, a throttle portion which throttles the individual flow pat
    Type: Grant
    Filed: January 19, 2017
    Date of Patent: November 19, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Shunya Fukuda, Motoki Takabe, Eiju Hirai, Akira Miyagishi, Hajime Nakao
  • Publication number: 20190077152
    Abstract: A liquid ejecting head includes a flow path forming substrate, a vibration plate that is formed on one surface side of the flow path forming substrate, a first piezoelectric element that is provided on the vibration plate, a second piezoelectric element that is provided on the vibration plate, a protective substrate that is bonded to the one surface side of the flow path forming substrate, a flow path member that is adhered to a side of the protective substrate opposite to the flow path forming substrate via an adhesive, and a drive circuit that is mounted in a space formed so as to be surrounded by the flow path forming substrate, the protective substrate, and the flow path member, in which the flow path member is provided with a hole portion which is open to a region facing the space.
    Type: Application
    Filed: September 12, 2018
    Publication date: March 14, 2019
    Inventor: Hajime NAKAO
  • Publication number: 20190077149
    Abstract: A liquid ejecting head includes a flow path forming substrate, a vibration plate that is formed on one surface side of the flow path forming substrate, a plurality of piezoelectric elements that are provided on the vibration plate, a protective substrate that is bonded to the one surface side of the flow path forming substrate and has a flow path, a flow path member that is bonded to a side of the protective substrate opposite to the flow path forming substrate, a drive circuit that is mounted in a space formed so as to be surrounded by the flow path forming substrate, the protective substrate, and the flow path member, a filler that is filled between the drive circuit and the protective substrate, and a protective film that is formed on an inner wall, in which the protective film has an exposure hole exposing a surface of the filler.
    Type: Application
    Filed: September 11, 2018
    Publication date: March 14, 2019
    Inventors: Masao NAKAYAMA, Shunya FUKUDA, Eiju HIRAI, Shiro YAZAKI, Hajime NAKAO
  • Patent number: 10227541
    Abstract: A lubricating oil composition for transmissions is provided which improves fuel saving properties and has excellent metal fatigue life and heat resistance. The composition contains 50 to 97 percent by mass of (A) a mineral base oil having a 100° C. kinematic viscosity of 1.5 mm2/s or higher and 3.5 mm2/s or lower, a pour point a ?25° C. or lower, a viscosity index of 105 or greater, a % CP of 85 or greater, a % CN of 2 or greater and 20 or less and a % CA of 3 or less; 3 to 10 percent by mass of (B) a monoester-based base oil having a 100° C. kinematic viscosity of 2 mm2/s or higher and 10 mm2/s or lower; and 150 to 400 ppm by mass as phosphorus of (C) a specific sulfur-containing phosphite ester. The composition has a 100° C. kinematic viscosity of 2.5 mm2/s or higher and 4.0 mm2/s or lower.
    Type: Grant
    Filed: April 7, 2015
    Date of Patent: March 12, 2019
    Assignee: JX Nippon Oil & Energy Corporation
    Inventors: Kohei Masuda, Hitoshi Komatsubara, Hajime Nakao
  • Publication number: 20170217179
    Abstract: A flow path forming substrate in which an individual flow path which communicates with a nozzle opening that discharges liquid is formed; and a communication plate in which a recess portion which configures at least a part of a common flow path that is common to and communicates with the plurality of individual flow paths is provided to be open on a side opposite to the flow path forming substrate, are provided, the recess portion includes a first recess portion, and a second recess portion which is deeper than the first recess portion, the communication plate includes a supply path which is provided to be open on a bottom surface of the first recess portion, communicates with the recess portion and the individual flow path, and becomes a throttle portion that throttles a flow path with respect to the individual flow path, and a communication path which communicates with the individual flow path and the nozzle opening, and in the individual flow path, a throttle portion which throttles the individual flow pat
    Type: Application
    Filed: January 19, 2017
    Publication date: August 3, 2017
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Shunya FUKUDA, Motoki TAKABE, Eiju HIRAI, Akira MIYAGISHI, Hajime NAKAO
  • Patent number: 9701117
    Abstract: A liquid-jet head includes: a passage member including a plurality of individual passages and a manifold communicating commonly with the individual passages, the individual passages each having a pressure generating chamber communicating with a nozzle orifice that ejects liquid, the pressure generating chambers being formed on one surface side of the passage member on an opposite side from the nozzle orifices, the individual passages and the manifold communicating with each other through communicating paths, and each adjacent two of the individual passages communicating with each other through the corresponding communicating path; and reinforcement walls each provided between the communicating paths in a parallel direction of the individual passages, the reinforcement walls defining the communicating paths.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: July 11, 2017
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Hajime Nakao, Takaaki Koizumi
  • Publication number: 20170145337
    Abstract: A lubricating oil composition for transmissions is provided which improves fuel saving properties and has excellent metal fatigue life and heat resistance. The composition contains 50 to 97 percent by mass of (A) a mineral base oil having a 100° C. kinematic viscosity of 1.5 mm2/s or higher and 3.5 mm2/s or lower, a pour point a ?25° C. or lower, a viscosity index of 105 or greater, a % Cp of 85 or greater, a % CN of 2 or greater and 20 or less and a % CA of 3 or less; 3 to 10 percent by mass of (B) a monoester-hased base oil having a 100° C. kinematic viscosity of 2 mm2/s or higher and 10 mm2/s or lower; and 150 to 400 ppm by mass as phosphorus of (C) a specific sulfur-containing phosphite ester. The composition has a 100° C. kinematic viscosity of 2.5 mm2/s or higher and 4.0 mm2/s or lower.
    Type: Application
    Filed: April 7, 2015
    Publication date: May 25, 2017
    Inventors: Kohei MASUDA, Hitoshi KOMATSUBARA, Hajime NAKAO
  • Patent number: 9540587
    Abstract: A lubricating oil composition for transmissions having improved fuel saving properties, excellent metal fatigue prevention properties, and heat resistance containing: a lubricating base oil containing (A) a mineral base oil having a 100° C. kinematic viscosity of 1.5 mm2/s or higher and 3.5 mm2/s or lower, a pour point of ?25° C. or lower, a viscosity index of 105 or greater, a % CP of 85 or greater, a % CN of 2 or greater and 20 or less and a % CA of 3 or less and (B) a monoester-based base oil having a 100° C. kinematic viscosity of 2 to 10 mm2/s; (C) a phosphorus acid ester; and (D) a boronated ashless dispersant, the ratio of the mass percent of boron to the mass percent of phosphorus in the composition (B/P) being from 0.07 to 0.42, and the composition having a 100° C. kinematic viscosity of 2.5 to 4.0 mm2/s is described.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: January 10, 2017
    Assignees: JX Nippon Oil & Enery Corporation, AISIN AW CO., LTD.
    Inventors: Hajime Nakao, Hitoshi Komatsubara, Kazunori Ishikawa, Katsuhito Yamada
  • Patent number: 9505227
    Abstract: A liquid ejecting apparatus includes a liquid ejecting head that includes a nozzle opening which ejects liquid and a valve unit that is connected to the liquid ejecting head and opens and closes a flow passage of the liquid, in which the valve unit includes a valve seat which is provided in the flow passage and a valve body which opens and closes the flow passage by coming into contact with or being separated from the valve seat, the valve seat includes a contacting member coming into contact with the valve body and a supporting member which supports the contacting member, the contacting member is assembled with the supporting member in a state in which the supporting member is subjected to a water repellent treatment more than the inner surface of the flow passage, and the valve body includes an elastic member coming into contact with the valve seat and a fixing member which fixes the elastic member.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: November 29, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Hajime Nakao, Nobuhiko Yamauchi
  • Patent number: 9469108
    Abstract: A liquid ejecting head which ejects a liquid from a nozzle of a nozzle plate by means of pressure change in a pressure chamber includes a first member made of ceramics and including the pressure chamber, a second member located between the first member and the nozzle plate, the second member being made of a metal and including a first flow path at a position upstream to the pressure chamber so as to regulate the amount of liquid which flows into the pressure chamber, and a ground wire that grounds the second member.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: October 18, 2016
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Hajime Nakao, Shunsuke Watanabe
  • Patent number: 9387674
    Abstract: A flow path unit includes a pressure chamber substrate in which a plurality of pressure chambers are arranged in a first direction; and a piezoelectric element that changes a volume of the pressure chamber, in which a plane shape of an active section of the piezoelectric element is contained such that a width on one side thereof in a second direction crossing the first direction is wider than that on the other side in the second direction. The side on which the width of the active section of the piezoelectric element is great and the side on which the width thereof is smaller in the second direction be alternately disposed each other so that the active sections adjacent to each other are arranged differently from each other in the first direction.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: July 12, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Hajime Nakao, Eiji Natori
  • Patent number: 9381747
    Abstract: A flow path component includes a first flow path member that includes a first flow path, a second flow path member that includes a second flow path which communicates with the first flow path, a covering layer that coats a wall surface of the first flow path, and an adhesion layer that adheres the first flow path member and the second flow path member with each other and covers at least a part of an end portion of the covering layer. Also, at least a part of the first flow path of the first flow path member is configured as a pressure chamber that applies pressure to a liquid which is supplied.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: July 5, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Hajime Nakao
  • Patent number: 9340747
    Abstract: The present invention provides a lubricating oil composition for transmissions which is improved in fuel saving properties and has excellent metal fatigue prevention properties and heat resistance. The lubricating oil composition comprises (A) a mineral base oil having a 100° C. kinematic viscosity of 1.5 mm2/s or higher and 3.5 mm2/s or lower, a pour point of ?25° C. or lower, a viscosity index of 110 or greater, a % CN of 2 or greater and 20 or less and a % CA of 3 or less, the lubricating oil composition having a 100° C. kinematic viscosity of 2.5 mm2/s or higher and 3.8 mm2/s or lower.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: May 17, 2016
    Assignee: JX Nippon Oil & Energy Corporation
    Inventors: Hajime Nakao, Hitoshi Komatsubara
  • Patent number: 9272294
    Abstract: The portions at the circumferential edges of a flow channel formation plate in which the corner portions of a dummy flow channel portion are formed are weaker than other portions, and thus when thermal stress has occurred due to temperature changes when the constituent elements of a flow channel unit are affixed to each other, cracks can be induced preferentially in the weak portion, rather than the other portions, starting from the ends of the corner portions. In particular, although similar corner portions are formed in a common liquid chamber, the intersection angle of the corner portions in the dummy flow channel portion is smaller than the intersection angle of the corner portions in the common liquid chamber, and thus it is easier for stress to concentrate in the corner portions of the dummy flow channel portion.
    Type: Grant
    Filed: March 29, 2012
    Date of Patent: March 1, 2016
    Assignee: Seiko Epson Corporation
    Inventors: Nozomi Ogawa, Hajime Nakao, Isamu Togashi
  • Patent number: 9248649
    Abstract: Provided is a liquid ejecting head which ejects liquid from nozzle holes by changing a pressure in a liquid flow path in a pressure chamber. The liquid ejecting head includes a flow path member which is formed of ceramic, and in which the pressure chamber is formed; and a piezoelectric element which includes at least a first piezoelectric layer which is formed of ceramic. The first piezoelectric layer of the piezoelectric element is bonded to the flow path member, and the first piezoelectric layer faces the pressure chamber.
    Type: Grant
    Filed: March 27, 2014
    Date of Patent: February 2, 2016
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Hajime Nakao, Shunsuke Watanabe
  • Publication number: 20160023464
    Abstract: A liquid ejecting apparatus includes a liquid ejecting head that includes a nozzle opening which ejects liquid and a valve unit that is connected to the liquid ejecting head and opens and closes a flow passage of the liquid, in which the valve unit includes a valve seat which is provided in the flow passage and a valve body which opens and closes the flow passage by coming into contact with or being separated from the valve seat, the valve seat includes a contacting member coming into contact with the valve body and a supporting member which supports the contacting member, the contacting member is assembled with the supporting member in a state in which the supporting member is subjected to a water repellent treatment more than the inner surface of the flow passage, and the valve body includes an elastic member coming into contact with the valve seat and a fixing member which fixes the elastic member.
    Type: Application
    Filed: July 22, 2015
    Publication date: January 28, 2016
    Inventors: Hajime NAKAO, Nobuhiko YAMAUCHI
  • Patent number: 9242463
    Abstract: A liquid-jet head includes: a plurality of individual passages communicating with nozzle orifices that jet liquid; a manifold communicating with the plurality of individual passages, in which a surface of the manifold on the liquid-jetting face side is sealed with a sealing member; and a rib provided in the manifold on the sealing member side.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: January 26, 2016
    Assignee: SEIKO EPSON CORPORATION
    Inventors: Manabu Munakata, Hajime Nakao, Takaaki Koizumi, Masato Komazawa
  • Publication number: 20150376544
    Abstract: A lubricating oil composition for transmissions having improved fuel saving properties, excellent metal fatigue prevention properties, and heat resistance containing: a lubricating base oil containing (A) a mineral base oil having a 100° C. kinematic viscosity of 1.5 mm2/s or higher and 3.5 mm2/s or lower, a pour point of ?25° C. or lower, a viscosity index of 105 or greater, a % Cp of 85 or greater, a % CN of 2 or greater and 20 or less and a % CA of 3 or less and (B) a monoester-based base oil having a 100° C. kinematic viscosity of 2 to 10 mm2/s; (C) a phosphorus acid ester; and (D) a boronated ashless dispersant, the ratio of the mass percent of boron to the mass percent of phosphorus in the composition (B/P) being from 0.07 to 0.42, and the composition having a 100° C. kinematic viscosity of 2.5 to 4.0 mm2/s is described.
    Type: Application
    Filed: November 19, 2013
    Publication date: December 31, 2015
    Applicants: JX Nippon Oil & Energy Corporation, AISIN AW CO., LTD.
    Inventors: Hajime NAKAO, Hitoshi KOMATSUBARA, Kazunori ISHIKAWA, Katsuhito YAMADA