Patents by Inventor Hiroshi Owada

Hiroshi Owada 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: 10351114
    Abstract: In a master cylinder, a piston seal provided in a circumferential groove includes an annular base section, an inner circumferential lip section protruding from an inner circumferential side of the base section to come into sliding contact with an outer circumferential surfaced of a piston, an outer circumferential lip section protruding from an outer circumferential side of the base section to abut the circumferential groove, and an intermediate protrusion section protruding from a portion between the inner circumferential lip section and the outer circumferential lip section of the base section to a position further forward than the outer circumferential lip section. At least one inner circumferential side groove extending in an axial direction and opened at a front end side of the intermediate protrusion section is formed in a surface of the inner circumferential lip section side of the intermediate protrusion section.
    Type: Grant
    Filed: August 4, 2014
    Date of Patent: July 16, 2019
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Hiroshi Owada, Shinya Kasai
  • Publication number: 20190039590
    Abstract: Provided are a brake apparatus, a brake system, and a master cylinder that can accurately detect a movement amount of a piston while reducing manufacturing cost. A brake apparatus includes a master cylinder housing including a cylinder therein, a piston provided inside the cylinder and movable in a direction of an axial line of the cylinder, a magnet provided, inside the cylinder, partially in a circumferential direction of the piston, which is a direction around the axial line, and configured to be displaced according to a movement of the piston, a detection portion provided on the master cylinder housing and configured to detect a movement amount of the piston, and a rotation restriction mechanism provided inside the cylinder and configured to restrict a movement of the magnet in the circumferential direction.
    Type: Application
    Filed: February 3, 2017
    Publication date: February 7, 2019
    Inventors: Ryohei MARUO, Chiharu NAKAZAWA, Hiroshi OWADA, Naganori KOSHIMIZU
  • Publication number: 20180215361
    Abstract: Provided is a master cylinder unit including a communication path that causes a master cylinder and a stroke simulator to communicate with each other. The stroke simulator includes a bottomed tube-shaped simulator piston and a simulator cylinder in which a simulator piston slides. The simulator piston is such that a bottom portion of the simulator cylinder and an opening portion of the simulator piston face each other. The communication path is open over an outer circumferential portion and an inner circumferential portion of the opening portion of the simulator piston, is connected to the bottom portion of the simulator cylinder, and is provided such that the communication path extends upward in a vertical direction from the bottom portion of the simulator cylinder as approaching to a pressure chamber.
    Type: Application
    Filed: July 25, 2016
    Publication date: August 2, 2018
    Inventors: Naganori KOSHIMIZU, Hiroshi OWADA, Chiharu NAKAZAWA, Ryohei MARUO
  • Publication number: 20180201247
    Abstract: Provided is a master cylinder unit including a simulator pressure chamber which communicates with a pressure chamber of a master cylinder and moves a simulator piston by means of an introduced fluid pressure; a biasing chamber in which a biasing mechanism biasing the simulator piston against a fluid pressure introduced into the simulator pressure chamber is disposed; a first seal member which partitions a simulator supply chamber, the simulator supply chamber, and the simulator pressure chamber communicating with a master supply chamber; and a second seal member which partitions the simulator supply chamber and the biasing chamber and allows a brake fluid to flow from the simulator supply chamber to the biasing chamber when a pressure difference occurs between the simulator supply chamber and the biasing chamber.
    Type: Application
    Filed: July 25, 2016
    Publication date: July 19, 2018
    Inventors: Naganori KOSHIMIZU, Hiroshi OWADA, Toshiya OOSAWA, Ryohei MARUO
  • Patent number: 9896074
    Abstract: An input rod is operated by a brake pedal to introduce the air into a variable-pressure chamber through a control valve to propel a power piston, thereby advancing a primary piston to generate a brake fluid pressure in a master cylinder. A part of the reaction force from the fluid pressure is transmitted to the input rod through a reaction member. The primary piston is provided with an idle stroke in which no fluid pressure is generated, and the reaction force to be transmitted to a plunger is limited by a reaction force adjusting spring. In the region of the idle stroke, a fluid pressure is supplied to a wheel cylinder through a fluid pressure control unit to perform regenerative cooperative control, and a reaction force from a reaction spring is applied to the input rod.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: February 20, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Mitsuhiro Endo, Hiroshi Owada
  • Publication number: 20160200304
    Abstract: In a master cylinder, a piston seal provided in a circumferential groove includes an annular base section, an inner circumferential lip section protruding from an inner circumferential side of the base section to come into sliding contact with an outer circumferential surfaced of a piston, an outer circumferential lip section protruding from an outer circumferential side of the base section to abut the circumferential groove, and an intermediate protrusion section protruding from a portion between the inner circumferential lip section and the outer circumferential lip section of the base section to a position further forward than the outer circumferential lip section. At least one inner circumferential side groove extending in an axial direction and opened at a front end side of the intermediate protrusion section is formed in a surface of the inner circumferential lip section side of the intermediate protrusion section.
    Type: Application
    Filed: August 4, 2014
    Publication date: July 14, 2016
    Inventors: Hiroshi OWADA, Shinya KASAI
  • Publication number: 20140238555
    Abstract: A high strength hot rolled steel sheet having a tensile strength of 780 MPa or more is produced by specifying the composition to contain C: more than 0.035% and 0.07% or less, Si: 0.3% or less, Mn: more than 0.35% and 0.7% or less, P: 0.03% or less, S: 0.03% or less, Al: 0.1% or less, N: 0.01% or less, Ti: 0.135% or more and 0.235% or less, and the remainder composed of Fe and incidental impurities, on a percent by mass basis, in such a way that C, S, N, and Ti satisfy ((Ti?(48/14)N?(48/32)S)/48)/(C/12)<1.0 (C, S, N, and Ti: content of the respective elements (percent by mass)) and specifying the microstructure in such a way that a matrix includes more than 95% of ferritic phase on an area fraction basis and fine Ti carbides having an average grain size of less than 10 nm are precipitated in the grains of the above-described ferritic phase.
    Type: Application
    Filed: November 1, 2012
    Publication date: August 28, 2014
    Inventors: Yoshimasa Funakawa, Tamako Ariga, Tetsuo Yamamoto, Hiroshi Uchomae, Hiroshi Owada
  • Publication number: 20120200147
    Abstract: An input rod is operated by a brake pedal to introduce the air into a variable-pressure chamber through a control valve to propel a power piston, thereby advancing a primary piston to generate a brake fluid pressure in a master cylinder. A part of the reaction force from the fluid pressure is transmitted to the input rod through a reaction member. The primary piston is provided with an idle stroke in which no fluid pressure is generated, and the reaction force to be transmitted to a plunger is limited by a reaction force adjusting spring. In the region of the idle stroke, a fluid pressure is supplied to a wheel cylinder through a fluid pressure control unit to perform regenerative cooperative control, and a reaction force from a reaction spring is applied to the input rod.
    Type: Application
    Filed: February 6, 2012
    Publication date: August 9, 2012
    Inventors: Mitsuhiro Endo, Hiroshi Owada
  • Publication number: 20060054695
    Abstract: By changing methods from the conventional method in which a plurality of bar codes are arranged in the space for use to the method of the invention in which a plurality of bar codes are used according to time, so that the conventional bar codes which are displayed in a fixed fashion are changed over to dynamic bar codes which are displayed dynamically, a dynamic bar code display apparatus for displaying bar codes which are difficult to be copied and which increases the volume of data of the bar codes, a dynamic bar code generation method and a storage medium which generates dynamic bar codes can be provided. The bar code display apparatus comprises a storage means in which bar code images are stored, a display means for displaying at least two or more bar codes continuously and a control means for controlling the display means.
    Type: Application
    Filed: May 30, 2002
    Publication date: March 16, 2006
    Inventor: Hiroshi Owada
  • Patent number: 6247009
    Abstract: Information indicating image data and the number of times (the number of votes) the image data was found upon search are managed in an image management unit in correspondence with each other in units of image data stored in an image storage unit. A search condition is input from a user interface, and image data matching the input search conditions are searched for. The numbers of votes for the obtained image data are acquired from the image management unit, and the obtained image data are sorted and displayed on a search result notifying unit on the basis of the acquired numbers of votes.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: June 12, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hirotaka Shiiyama, Hiroshi Owada
  • Patent number: 5578764
    Abstract: A Coriolis type mass flowmeter utilizing a measuring tube through which flows the fluid being examined and a pair of Coriolis signals generated thereby, wherein are provided a first and second A/D converter to convert the respective pair of Coriolis signals into respective digital signals; a first and second phase shifter for converting the respective digital signals to output signals each deviated from the respective digital signals by 90.degree.; a timing clock generator for supplying the first and second A/D converter with timing signals which are independent of vibrations of the Coriolis signals, and trigonometric calculating device for obtaining tan .PHI. using the following equation: tan .PHI.=(bc-ad)/(ac+bd), wherein a and c represent the outputs from the A/D converters, and b and d represent the outputs from the phase shifters, and tan .PHI.
    Type: Grant
    Filed: July 5, 1995
    Date of Patent: November 26, 1996
    Assignee: Yokogawa Electric Corporation
    Inventors: Toyoaki Yokoi, Hiroshi Owada
  • Patent number: 5278443
    Abstract: A semiconductor device includes a diode having a Schottky barrier and a MOS transistor integrally formed in one and the same semiconductor substrate in which the diode and MOS transistor have their main electrode in common use. The diode has a first diode portion having a pn junction in a current-passing direction and a second diode portion having a combination of the Schottky barrier and another pn junction in the current passing direction.
    Type: Grant
    Filed: November 5, 1992
    Date of Patent: January 11, 1994
    Assignees: Hitachi, Ltd., Hitachi Haramachi Semiconductor, Ltd.
    Inventors: Mutsuhiro Mori, Yasumiti Yasuda, Naoki Sakurai, Hidetoshi Arakawa, Hiroshi Owada
  • Patent number: 5166760
    Abstract: A semiconductor device is provided wherein a first diode having a pn junction and a second diode having a combination of a Schottky barrier and a pn junction in a current-passing direction are provided side by side in a direction perpendicular to the current-passing direction. When a forward current with a current density J.sub.F is passed into the second diode, the relation ##EQU1## is established in a forward voltage V.sub.F range of 0.1 (V) to 0.3 (V), where k represents the Boltzmann constant (.apprxeq.1.38.times.10.sup.-23 J/K), T represents the absolute temperature, and q represents the quantity of electron charges (.apprxeq.1.6.times.10.sup.-19 C).
    Type: Grant
    Filed: February 11, 1992
    Date of Patent: November 24, 1992
    Assignees: Hitachi, Ltd., Hitachi Haramachi Semiconductor Ltd.
    Inventors: Mutsuhiro Mori, Yasumiti Yasuda, Naoki Sakurai, Hidetoshi Arakawa, Hiroshi Owada
  • Patent number: 5101244
    Abstract: A semiconductor device has a first diode having a pn junction and a second diode having a combination of a Schottky barrier and a pn junction in a current-passing direction provided side by side in a direction perpendicular to the current-passing direction. When a forward current with a current density J.sub.F is passed into the second diodes, the relation ##EQU1## is established in a forward voltage V.sub.F range of 0.1 (V) to 0.3 (V), where k represents the Boltzmann constant, T represents the absolute temperature, and q represents the quantity of electron charges.
    Type: Grant
    Filed: February 26, 1991
    Date of Patent: March 31, 1992
    Assignees: Hitachi, Ltd., Hitachi Haramachi Semiconductor Ltd.
    Inventors: Mutsuhiro Mori, Yasumiti Yasuda, Naoki Sakurai, Hidetoshi Arakawa, Hiroshi Owada
  • Patent number: 4825116
    Abstract: A transmitter- receiver of an ultrasonic distance measuring device comprising a cylindrical piezoelectric element made of a polymer in place of a piezoelectric vibrator of a ceramic material or the like which has heretofore been used. The cylindrical piezoelectric element is secured to a columnar supporter in such a manner as to define a chamber in cooperation with a recess which is provided in the peripheral surface of the supporter. The supporter is provided with a pressure equalizing bore which provides communication between the chamber and the outside. In addition, a conical reflector is provided so as to impart directivity to the ultasonic wave transmitted from the piezoelectric element.
    Type: Grant
    Filed: March 23, 1988
    Date of Patent: April 25, 1989
    Assignee: Yokogawa Electric Corporation
    Inventors: Ichizo Itoh, Hiroshi Owada, Toru Fujii