Patents by Inventor Shigeru Hirata

Shigeru 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: 7499253
    Abstract: A temperature protective circuit of the semiconductor integrated circuit unit of the present invention is configured such that the circuit includes a heat generation detecting section for detecting a monitored temperature and a limiting signal producing section for limiting continuously or stepwise the drive of a load (for example, the upper limit of drive current) according to the above-mentioned monitored temperature, after the above-mentioned monitored temperature exceeds a first threshold temperature, based on the detection results of the above-mentioned heat generation detecting section. With such a configuration, an abnormal heat generation of a subject of overheat monitoring can be previously limited to perform a more safely temperature protective operation.
    Type: Grant
    Filed: March 7, 2006
    Date of Patent: March 3, 2009
    Assignee: Rohm Co., Ltd.
    Inventors: Shigeru Hirata, Masanori Tsuchihashi, Kazuhiro Murakami
  • Publication number: 20080219649
    Abstract: A motor drive device of the present invention includes: an output circuit provided with a switch element connected to a motor; a PWM signal generating circuit for generating a PWM signal having a duty corresponding to a ratio between a power supply voltage applied to the motor and a predetermined control voltage; a control circuit for performing on/off control of the switch element according to the PWM signal; and a control voltage generating circuit for generating the control voltage such that the back electromotive voltage of the motor is maintained at a desired value.
    Type: Application
    Filed: March 5, 2008
    Publication date: September 11, 2008
    Applicant: Rohm Co., Ltd.
    Inventor: Shigeru Hirata
  • Patent number: 7390188
    Abstract: A resin molding apparatus includes a fixing member to which a top mold is attached, a movable member to which a bottom mold is attached, a push-up member provided below the movable member, a drive mechanism moving the push-up member in upward/downward direction, and a flexible joint provided between the movable member and the push-up member. The push-up force of the drive mechanism is transmitted from the push-up member via the flexible joint to the movable member. Thus, a crack does not occur at a connection portion between the push-up member and the movable member. Therefore, a gap is not created between the top mold and the bottom mold. As a result, an excellent molded product is formed.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: June 24, 2008
    Assignee: Towa Corporation
    Inventors: Toshinobu Banjo, Shigeru Hirata, Masanori Shirasawa
  • Publication number: 20080111614
    Abstract: A semiconductor device comprising an internal current generating section (1) for supplying an output current (i2) dependent on an input current (i1) into an IC, an external terminal (2) for connecting an external resistor (Rex) to the input end side of the internal current generating section (1), a current limiting element (3) connoted between the input end of the internal current generating section (1) and the external terminal (2), a first current limiting section (4) for pulling in the input current (i1) when one end voltage VA of the current limiting element (3) is higher than a first threshold voltage VB, and a second current limiting section (5) for pulling in the input current (i1) when the terminal voltage VC of the external terminal (2) is higher than a second threshold voltage. System down can be avoided by operating the internal circuit surely regardless of the state of the external terminal.
    Type: Application
    Filed: October 21, 2005
    Publication date: May 15, 2008
    Applicant: ROHM CO., LTD.
    Inventors: Masanori Tsuchihashi, Shigeru Hirata
  • Publication number: 20060240140
    Abstract: A resin molding apparatus includes a fixing member to which a top mold is attached, a movable member to which a bottom mold is attached, a push-up member provided below the movable member, a drive mechanism moving the push-up member in upward/downward direction, and a flexible joint provided between the movable member and the push-up member. The push-up force of the drive mechanism is transmitted from the push-up member via the flexible joint to the movable member. Thus, a crack does not occur at a connection portion between the push-up member and the movable member. Therefore, a gap is not created between the top mold and the bottom mold. As a result, an excellent molded product is formed.
    Type: Application
    Filed: March 24, 2006
    Publication date: October 26, 2006
    Inventors: Toshinobu Banjo, Shigeru Hirata, Masanori Shirasawa
  • Publication number: 20060198074
    Abstract: A temperature protective circuit of the semiconductor integrated circuit unit of the present invention is configured such that the circuit includes a heat generation detecting section for detecting a monitored temperature and a limiting signal producing section for limiting continuously or stepwise the drive of a load (for example, the upper limit of drive current) according to the above-mentioned monitored temperature, after the above-mentioned monitored temperature exceeds a first threshold temperature, based on the detection results of the above-mentioned heat generation detecting section. With such a configuration, an abnormal heat generation of a subject of overheat monitoring can be previously limited to perform a more safely temperature protective operation.
    Type: Application
    Filed: March 7, 2006
    Publication date: September 7, 2006
    Inventors: Shigeru Hirata, Masanori Tsuchihashi, Kazuhiro Murakami
  • Publication number: 20060001101
    Abstract: A semiconductor device has a supply pad to which a supply voltage is fed, a supply conductor that is electrically connected to the supply pad, an input/output pad via which a signal is fed in from outside or fed out to outside, an electrostatic protection device that is electrically connected to the input/output pad and that is electrically connected via the supply conductor to the supply pad, and an internal circuit that is electrically connected via a signal conductor to the input/output pad. The electrostatic protection device, the input/output pad, and the internal circuit are arranged in this order from edge to center of the semiconductor device.
    Type: Application
    Filed: July 1, 2005
    Publication date: January 5, 2006
    Inventor: Shigeru Hirata
  • Patent number: 6632298
    Abstract: The present invention aims at providing a sophisticated segregation reducing technique which a conventional technique cannot achieve by finding the relationship between the casting structure and the segregation of components at the time of solidification and the heat treatment conditions. That is, the present invention aims at providing material for shadow masks which exhibits excellent quality with respect to streaks. A material for a shadow mask of the present invention is formed of a casting slab for preparing the shadow mask which comprises an Ni—Fe alloy containing 30 to 45% of Ni. The casting slab has a cast structure comprising a columnar crystal and/or a chill crystal in an amount of 99% or more. In particular, it is preferred that the casting slab contains no equiaxed crystal.
    Type: Grant
    Filed: February 26, 2002
    Date of Patent: October 14, 2003
    Assignees: Toyo Kohan Co., Ltd., Nippon Yakin Kogyo Co., Ltd.
    Inventors: Syun-ichi Morita, Taizo Sato, Jun Agari, Tsutomu Omori, Tatsuya Itoh, Shigeru Hirata
  • Patent number: 6377008
    Abstract: In a motor driving device, the currents supplied from a driver (3) to three-phase coils (2) of a motor are made to flow through a resistor (R), and the voltage appearing across this resistor (R) is fed to the positive input terminal of a current limiting circuit (8). The differential signal between this voltage and a voltage (V) fed to the negative input terminal of the current limiting circuit (8) is fed as a voltage signal to an OR circuit (9). Also an FG signal produced by a logic circuit (5) to represent the rotational speed of the motor is fed, through a speed discriminator (6) and a filter (7), as a voltage signal to the OR circuit (9). The OR circuit (9) feeds a voltage signal having a high level to a PWM comparator (11), which produces a PWM signal and feeds it to the logic circuit (5). Thus, when the currents supplied to the three-phase coils (2) are about to exceed a limit, the currents are limited so as not to exceed the limit by the voltage signal output from the current limit circuit (8).
    Type: Grant
    Filed: July 12, 2000
    Date of Patent: April 23, 2002
    Assignee: Rohm Co., Ltd.
    Inventor: Shigeru Hirata
  • Patent number: 5763693
    Abstract: In a process for producing isopropyl alcohol by direct liquid phase hydration of propylene and water in the presence of a strong acid solid catalyst at a high temperature and a high pressure, the reaction is carried out at a temperature in a ranging between 100.degree. and 250.degree. C. and a pressure in a ranging between 60 and 200 atm in an excess of water. Then, a liquid phase of the reaction product is contacted with an extraction agent of a saturated hydrocarbon having 3 or 4 carbon atoms at a temperature in a ranging between the critical temperature of the extraction agent and the temperature higher than the critical temperature by 40.degree. C. under a pressure ranging between the critical pressure of the extraction agent and 200 atm at an S/F ratio ranging between 0.3 and 3 which is calculated from the equation of the amount of the extraction agent divided by the amount of the extract feed.
    Type: Grant
    Filed: February 21, 1996
    Date of Patent: June 9, 1998
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Shigeru Hirata, Shinji Ogawa
  • Patent number: 5714646
    Abstract: A process for producing isopropyl alcohol by hydrating directly propylene and water in the presence of a strong acid solid catalyst which includes feeding continuously propylene, water which is the same as or more than propylene in terms of mole, and a saturated hydrocarbon (propane, butane and the like) to a reactor in which the above solid catalyst is filled or suspended, and carrying out a hydration reaction in the conditions of 50.degree. to 200.degree. C. and 60 to 250 atm while maintaining the concentration of isopropyl alcohol contained in the reaction liquid at 6 to 30 weight %, and then drawing a vapor phase out of the reactor, liquefying a part of thereof by reducing the pressure or cooling to separate vapor components, and refining crude isopropyl alcohol contained in the liquid phase to obtain refined isopropyl alcohol.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: February 3, 1998
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Shigeru Hirata, Shinji Ogawa
  • Patent number: 4794363
    Abstract: In a thermostat type operating temperature setting apparatus, a slider is employed to preset the operating temperatures of electric appliances by sliding the slider along a long sliding path. The operating temperature setting apparatus includes a frame, a converter for converting temperature changes into pressure variations, a thermostat switching member for selectively changing bistable switching positions in response to the pressure variations, a rod for adjusting the operating temperature, a tension spring coupled between the adjusting rod and the switching member, for biasing the adjusting rod in a first direction, a slider, and a cam lever pivotably journaled to a fulcrum fixed on the frame and connected to the adjusting rod, for being slidably in touch with the slider. The setting apparatus further includes a conical compression spring mounted on the adjusting rod, for biasing the adjusting rod in a second direction opposite to the first direction.
    Type: Grant
    Filed: October 6, 1987
    Date of Patent: December 27, 1988
    Assignee: Kabushiki Kaisha Saginomiya Seisakusho
    Inventors: Shigeru Hirata, Hideyuki Yajima, Koichi Takahashi