Patents by Inventor Koji Sakai

Koji Sakai 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).

  • Battery pack
    Patent number: 8007937
    Abstract: A battery pack is provided.
    Type: Grant
    Filed: December 1, 2006
    Date of Patent: August 30, 2011
    Assignee: Sony Corporation
    Inventors: Kazuhito Hatta, Masato Sato, Tsuyoshi Sugiyama, Hiroyuki Yamada, Koji Sakai, Norio Mamada, Takeru Yamamoto, Kazuo Honda
  • METHOD OF RADIO COMMUNICATION, MOBILE TERMINAL, AND RADIO NETWORK CONTROL APPARATUS
    Publication number: 20110051696
    Abstract: A method of radio communication in a radio communication system including a plurality of mobile terminals and a base transceiver station. The method includes establishing radio communication between a first mobile terminal and the base transceiver station by using a first physical channel and a first dedicated channel, wherein a slot of the first physical channel is shared by time-division multiplexing by first and second control information, the first control information being for the first dedicated channel of the first mobile terminal, the second control information being for a second dedicated channel of a second mobile terminal, and switching the first physical channel to a second physical channel on the basis of a first communication quality of the established radio communication, wherein a slot of the second physical channel is dedicated to the first control information.
    Type: Application
    Filed: August 11, 2010
    Publication date: March 3, 2011
    Applicant: FUJITSU LIMITED
    Inventors: Yusuke Shinoda, Koji Sakai
  • Driving apparatus for a vehicle-mounted electric motor
    Publication number: 20110050136
    Abstract: An inverter circuit for a motor outputs three-phase AC currents, which are outputted from common connection points to stator coils, based on output voltage of a DC power source and a power supply capacitor by a switching operation of transistors. An inverter control circuit determines that a system main relay is turned off, upon receiving a main relay-off signal from an electronic control unit. The inverter control circuit turns on the low-side transistors, while turning off the high-side transistors. A discharge current flows from the positive electrode to the negative electrode of the power supply capacitor through the stator coil and the low-side transistors, so that electric charge stored in the power supply capacitor is discharged.
    Type: Application
    Filed: August 19, 2010
    Publication date: March 3, 2011
    Applicant: DENSO CORPORATION
    Inventors: Tomoyuki Sumi, Hiroshi Amano, Koji Sakai
  • ELECTRIC MOTOR DRIVE DEVICE, CONTROL METHOD OF ELECTRIC MOTOR DRIVE DEVICE, AND ELECTRICALLY DRIVEN DEVICE
    Publication number: 20110031922
    Abstract: An electric motor drive device has an inverter adjusting the voltage applied to an AC electric motor so as to drive the AC electric motor, a capacitor which is charged by a current supplied from a DC power supply supplying DC voltage between a neutral point at which a plurality of coils of the AC electric motor are connected and a positive rail or negative rail of an inverter and passing through the inverter, and a control circuit controlling the inverter so that the AC electric motor turns at a designated speed. Further, the control circuit selectively uses field weakening control and voltage boosting control for control of the inverter according to the conditions of the induced voltage generated at the AC electric motor, DC power supply, and voltage of the capacitor.
    Type: Application
    Filed: July 15, 2010
    Publication date: February 10, 2011
    Applicant: DENSO CORPORATION
    Inventors: Koji SAKAI, Akitomo Yamanaka
  • CONDITION CHANGING DEVICE
    Publication number: 20110019058
    Abstract: A condition change unit of the present invention changes operating conditions of a device. The condition change unit comprises a display section for displaying images, a touch panel provided on the display section, a detection section for detecting input operations to the touch panel, a change condition setting section for setting types of change conditions, based on form of the input operations detected by the detection section, an operation guide image display section for displaying guidance images, for setting specific parameters of the change conditions, on the display section, in accordance with the type of change condition that has been set, and a parameter change section for changing parameters of the change condition based on an input operation to a screen on which the operation guidance operation images are displayed that has been detected by the detection section.
    Type: Application
    Filed: July 16, 2010
    Publication date: January 27, 2011
    Inventors: Koji SAKAI, Izumi Sakuma, Osamu Nonaka
  • Method of detecting error of control information to be transmitted by downlink channel of radio communication and mobile terminal
    Patent number: 7804811
    Abstract: An error detection method for detecting an error of control information (parameters) of a physical channel and a mobile terminal are provided. In a receive side (mobile terminal), the size of each bit string generated in the transport channel HS-DSCH (High-Speed Downlink Shared Channel) processing (e.g. rate matching processing) in HSDPA (High-Speed Downlink Packet Access) is compared, so that an error of the control information, transmitted from the transmission side (base station) via the physical channel for control information HS-SCCH (High-Speed Shared Control Channel), is detected.
    Type: Grant
    Filed: June 29, 2005
    Date of Patent: September 28, 2010
    Assignee: Fujitsu Limited
    Inventors: Syuuichi Murata, Koji Sakai
  • Driving apparatus for three-phase AC synchronous motor
    Publication number: 20100231153
    Abstract: In a driving apparatus for a three-phase synchronous motor, in which a battery is connected between a neutral point of a stator coil and a negative-pole bus, a control circuit acquires three-phase AC currents. The control circuit checks whether a neutral-point electric current is contained in an electric current detected by an electric current detecting section. Based on the check result, the control circuit checks whether electric current values for three-phases containing the neutral-point electric current are set together or electric current values for three-phases excluding the neutral-point electric current are set together to acquire the three-phase AC currents for driving the motor.
    Type: Application
    Filed: March 4, 2010
    Publication date: September 16, 2010
    Applicant: DENSO CORPORATION
    Inventor: Koji Sakai
  • Communication device, communication system, communication method, communication program, and communication circuit
    Patent number: 7787391
    Abstract: In a client device (1) including OBject EXchange protocol (OBEX), a lower layer processing section (13) below an OBEX processing section (12) generates a pseudo response command for a request command, and notifies the pseudo response command to the OBEX layer processing section (12). This makes it possible for the client device (1) to communicate, via object exchange, with a server device having no transmitting function.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: August 31, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Koji Sakai, Hitoshi Naoe, Fumihiro Fukae, Shohei Osawa
  • Opening mechanism having a solid body, a movable body and a guide mechanism for sliding the movable body with respect to the solid body
    Patent number: 7773745
    Abstract: An opening mechanism has a guide mechanism which holds the movable body in such a manner as to be slidable in the predetermined direction with respect to the planar solid body. This structure allows the solid body, the movable body and the guide bodies to be made of planar materials such as a steel plate, thereby enabling the opening mechanism to have a thinner profile. In addition, these components can be produced by a comparatively simple process such as press working, making it possible to provide a less expensive opening mechanism. A thin electronic device using this opening mechanism is also provided.
    Type: Grant
    Filed: August 18, 2005
    Date of Patent: August 10, 2010
    Assignee: Panasonic Corporation
    Inventors: Takefumi Inoue, Koji Sakai
  • Demodulation circuit, IC, and communication device
    Patent number: 7668467
    Abstract: The demodulation circuit of the present invention is a demodulation circuit, connected with a plurality of light-receiving sections each for receiving an optical signal and converting the signal into a binary pulse signal, operable to select and demodulate a pulse signal out of pulse signals that are supplied from the light-receiving sections, respectively, the demodulation circuit including: a judgment and selection section for detecting timing with which High level and Low level of each of the pulse signals are switched and for selecting at least one pulse signal based on the timing; and a demodulation section for demodulating the pulse signal selected by the judgment and selection section. Consequently, the demodulation circuit easily selects and demodulates a signal whose jitter component is small out of a plurality of supplied signals.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: February 23, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hitoshi Naoe, Fumihiro Fukae, Koji Sakai, Shohei Ohsawa
  • Driving apparatus for multi-phase AC synchronous motor
    Publication number: 20100026220
    Abstract: An inverter control circuit controls transistors based on comparison of a voltage command wave with a carrier wave, when a magnitude of a voltage vector is equal to or less than a peak value of the carrier wave. The voltage command wave is a wave, which is offset to a maximum value side from a reference potential of the carrier wave so that a maximum value of the voltage command wave equals a peak value of the carrier wave. The inverter control circuit makes an on-period of the transistor on a positive bus side longer than that of the transistor on a negative bus side by using the command voltage. The amount of electricity charged in a capacitor is reduced in comparison with a case in which the voltage command wave is used. Thus, thermal loss of a stator coil and a diode on the positive bus side is reduced.
    Type: Application
    Filed: July 14, 2009
    Publication date: February 4, 2010
    Applicant: DENSO CORPORATION
    Inventor: Koji Sakai
  • Fluid pressure booster
    Patent number: 7607300
    Abstract: A fluid pressure booster includes: a control piston in which brake operation input acts in an advancing direction, and reaction based on fluid pressure of a booster fluid pressure generation chamber that generates fluid pressure for actuating a master piston acts in a retracting direction; a pressure increasing valve provided between the booster fluid pressure generation chamber and a fluid pressure generation source so as to open at the time of advance of the control piston and close at the time of retraction of the control piston; and a pressure reducing valve provided between a release chamber and the booster fluid pressure generation chamber so as to close at the time of the advance of the control piston and open at the time of the retraction of the control piston.
    Type: Grant
    Filed: March 27, 2006
    Date of Patent: October 27, 2009
    Assignee: Nissin Kogyo Co., Ltd.
    Inventors: Kazuhiro Tagata, Koji Sakai, Takaomi Shirase, Yasushi Aoki, Kenji Suzuki, Hiroshi Nakano
  • Adapter of a microphone for a digital camera
    Patent number: D617273
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: June 8, 2010
    Assignee: Olympus Imaging Corp.
    Inventor: Koji Sakai
  • Portion of a digital camera
    Patent number: D629438
    Type: Grant
    Filed: February 2, 2010
    Date of Patent: December 21, 2010
    Assignee: Olympus Imaging Corp.
    Inventor: Koji Sakai
  • Voice recording/reproducing device
    Patent number: D635120
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: March 29, 2011
    Assignee: Olympus Imaging Corp.
    Inventor: Koji Sakai
  • Voice recording/reproducing device
    Patent number: D635122
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: March 29, 2011
    Assignee: Olympus Imaging Corp.
    Inventor: Koji Sakai
  • Voice recording/reproducing device
    Patent number: D635545
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: April 5, 2011
    Assignee: Olympus Imaging Corp
    Inventor: Koji Sakai
  • Voice recording/reproducing device
    Patent number: D640228
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: June 21, 2011
    Assignee: Olympus Imaging Corp.
    Inventors: Koji Sakai, Yoshihiro Hayashi
  • Voice recording/reproducing device
    Patent number: D640229
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: June 21, 2011
    Assignee: Olympus Imaging Corp.
    Inventors: Koji Sakai, Yoshihiro Hayashi
  • Voice recording/reproducing device
    Patent number: D640230
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: June 21, 2011
    Assignee: Olympus Imaging Corp.
    Inventors: Koji Sakai, Yoshihiro Hayashi