Patents by Inventor Yoichi Yamamoto
Yoichi Yamamoto 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).
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Patent number: 7227524Abstract: An image processing apparatus, for processing an image signal representing pixel values of pixels so as to display an image including the pixels by an image display apparatus, includes a detection section for detecting a low frequency portion of the image signal, which corresponds to a first series of pixels having a first pixel value and a second series of pixels having a second pixel value different from the first pixel value, the second series of pixels following the first series of pixels; and a signal expansion section for expanding a prescribed portion of the low frequency portion of the image signal, the prescribed portion including at least one of the first series of pixels and the second series of pixels, such that the first pixel value is gradually changed to the second pixel value.Type: GrantFiled: May 29, 2003Date of Patent: June 5, 2007Assignee: Sharp Kabushiki KaishaInventors: Satoshi Ueno, Yasuhiro Yoshida, Hiroyuki Furukawa, Yoichi Yamamoto, Akira Yamaguchi
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Patent number: 7207619Abstract: Basically, a child seat tether anchor structures has a first end tether anchor, a second end tether anchor, an intermediate tether anchor, an anchoring tether, and a vehicle body mounting member with a height adjustment arrangement. In the illustrated embodiment, the vehicle child seat attachment structures are secured to both the vehicle body and the frame. Preferably, the vehicle child seat attachment structures are configured and arranged to move between a retracted position and an extended position. In the retracted position, the vehicle child seat attachment structures are covered by a carpet or other trim finishing material.Type: GrantFiled: March 26, 2004Date of Patent: April 24, 2007Assignee: Nissan Technical Center North America, Inc.Inventor: Yoichi Yamamoto
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Publication number: 20070030705Abstract: A simple and accurate dead time dispersion measurement method and a voltage source inverter control method that can prevent the occurrence of an unstable phenomenon are provided. The control method controls a voltage source inverter of a PWM system, which includes a power semiconductor device controlling a level of a voltage, a frequency and a phase. According to the control method, before operation, voltage error information for each polarity of respective phase currents of the inverter is stored. And during the operation, the voltage error information is read to compensate for a voltage instruction value or a pulse width of a PWM instruction signal, so that a voltage error can be corrected.Type: ApplicationFiled: July 30, 2004Publication date: February 8, 2007Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Yoichi Yamamoto, Masashiro Tanaka, Shigekazu Nakamura, Hiroshi Suetake
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Publication number: 20070018606Abstract: To provided a control method and a controller for an a.c. motor without using a speed sensor in which the speed estimated value or the magnetic flux estimated value of an all-dimensional magnetic flux speed observer can be made to correspond to that of an actual a.c. motor. A controller for an a.c.Type: ApplicationFiled: March 8, 2004Publication date: January 25, 2007Inventors: Hideaki Iura, Yoichi Yamamoto, Shigekazu Nakamura
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Patent number: 7147274Abstract: A windshield spacer basically has a mounting portion and a windshield supporting portion. The mounting portion has a fastening structure configured and arranged to be fixedly coupled to a vehicle body part. The windshield supporting portion is integrally formed with the mounting portion, and configured and arranged relative to the mounting portion to restrict a movement of a windshield in a direction substantially parallel to a main surface of the windshield and in a direction substantially perpendicular to the main surface of the windshield. The windshield spacer preferably further includes a molding retaining portion integrally formed with the mounting portion, and configured and arranged relative to the mounting portion to rigidly retain a windshield molding.Type: GrantFiled: September 3, 2004Date of Patent: December 12, 2006Assignee: Nissan Technical Center North AmericaInventor: Yoichi Yamamoto
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Patent number: 7142218Abstract: An image display device of the present invention is provided with a liquid crystal display panel for displaying an image in accordance with an input of a chrominance signal, a sensor for sensing light characteristics of external light, and a chrominance signal converter for converting a chrominance signal to be inputted into an image display section in accordance with an output of the sensor. The chrominance signal converter includes a target display color setting section for setting a color to display as an image agreeable with chromatic adaptation characteristics of human, according to the output of the sensor, and a color reproduction section for reproducing a target color set by the target display color setting section, by using three primary color with chromaticities suitable for the output of the sensor. The target display color setting section converts the chrominance signal into a chrominance signal of the target display color reproduced by the color reproduction section.Type: GrantFiled: May 7, 2001Date of Patent: November 28, 2006Assignee: Sharp Kabushiki KaishaInventors: Yasuhiro Yoshida, Yoichi Yamamoto
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Publication number: 20060138992Abstract: A problem to be solved by the present invention is to provide a motor controller capable of enhancing the safety of a crane, or the like, by accurately detecting a control deviant state within a short period of time by means of simple computation using the amount of control of a motor. According to the present invention, a voltage and a current of an AC motor are controlled by subjecting the voltage and current to coordinate transformation along two axes “d” and “q,” and detects occurrence of a control deviant state from “d” and “q” components of the voltage or current. A control deviant state is determined to have arisen when a value—which is computed on the basis of ?i=tan?1(Iq/Id) through use of an excitation current feedback value Id which is the “d” component of the electric current and the torque current feedback value Iq which is the q component—has attained a predetermined value or more.Type: ApplicationFiled: February 6, 2004Publication date: June 29, 2006Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventor: Yoichi Yamamoto
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Patent number: 7031240Abstract: A disc drive device optimally controls a speed for reading RTR-format data, such as video and audio, recorded on a DVD-format disc, thereby enabling real-time playback without interruption. In the disc drive device, information added to each sector is used for determining whether data is RTR-format data. When an error occurs at high-speed reading of RTR-format data and therefore the reading speed is changed to a low speed, the reading speed is so controlled as to be kept at the low speed for reading the following RTR-format data. Thus, for RTR-format data, overhead due to repetitive acceleration and deceleration processes can be avoided, and reading can be carried out without interfering with real-time playback. For normal data, reading can be carried out in a manner similar to that in the background art.Type: GrantFiled: April 22, 2004Date of Patent: April 18, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toru Suetomo, Masahiro Kawasaki, Masayuki Imada, Yoichi Yamamoto
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Publication number: 20060049669Abstract: A windshield spacer basically comprises a mounting portion and a windshield supporting portion. The mounting portion has a fastening structure configured and arranged to be fixedly coupled to a vehicle body part. The windshield supporting portion is integrally formed with the mounting portion, and configured and arranged relative to the mounting portion to restrict a movement of a windshield in a direction substantially parallel to a main surface of the windshield and in a direction substantially perpendicular to the main surface of the windshield. The windshield spacer preferably further includes a molding retaining portion integrally formed with the mounting portion, and configured and arranged relative to the mounting portion to rigidly retain a windshield molding.Type: ApplicationFiled: September 3, 2004Publication date: March 9, 2006Applicant: Nissan Technical Center North America, Inc.Inventor: Yoichi Yamamoto
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Publication number: 20060049795Abstract: It is the objective of the present invention to provide a sensorless vector control method and a control apparatus, for an alternating-current motor, that can smoothly restart an alternating-current motor in the free running state. According to the present invention, when a current that flows in an alternating-current motor (2) at a restart time 7 the alternating-current motor (2) continuously flows at a designated current level or higher for a designated period of time, it is determined that the rotational direction or the velocity of the alternating-current motor (2) is incorrectly estimated, and a direct current or a direct-current voltage is again applied to again estimate the rotational direction and the velocity.Type: ApplicationFiled: July 2, 2003Publication date: March 9, 2006Applicant: KABUSHIKI KAISHA YASKAWA DENKIInventors: Hideaki Iura, Kazuhiro Nonaka, Yuichi Terazono, Yoichi Yamamoto, Satoshi Sueshima, Katsushi Terazono, Mitsujiro Sawamura
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Publication number: 20060049622Abstract: A vehicle structure is provided that includes a structural support member, a vehicle body panel and a child seat tether anchor. The structural support member is configured and arranged to be coupled to a vehicle body. The vehicle body panel is fixedly attached to the structural support member. The child seat tether anchor is fixedly attached to the structural support member. The child seat tether anchor includes a body panel supporting portion supporting a lower surface of the vehicle body panel and a child seat connecting portion projecting through a cutout in the vehicle body panel. Preferably, the vehicle structure is manufactured by fixedly attaching the child seat tether anchor to the structural support member, then positioning the vehicle body panel on the child seat tether anchor, and then fixedly attaching the vehicle body panel to the structural support member.Type: ApplicationFiled: September 3, 2004Publication date: March 9, 2006Applicant: Nissan Technical Center North America, Inc.Inventor: Yoichi Yamamoto
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Publication number: 20050212321Abstract: Basically, a child seat tether anchor structures has a first end tether anchor, a second end tether anchor, an intermediate tether anchor, an anchoring tether, and a vehicle body mounting member with a height adjustment arrangement. In the illustrated embodiment, the vehicle child seat attachment structures are secured to both the vehicle body and the frame. Preferably, the vehicle child seat attachment structures are configured and arranged to move between a retracted position and an extended position. In the retracted position, the vehicle child seat attachment structures are covered by a carpet or other trim finishing material.Type: ApplicationFiled: March 26, 2004Publication date: September 29, 2005Applicant: Nissan Technical Center North America, Inc.Inventor: Yoichi Yamamoto
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Patent number: 6873584Abstract: A disk reproducing apparatus and a disk reproducing method which permit continuous reproduction of data of the RTR type without interruption and without affecting real time reproduction. A defective block list with defective blocks and alternative blocks registered linked to each other by the types of defective blocks has been acquired beforehand from a recording medium and when there arises need to read a defective block, its alternative block is read out and forwarded to a reproduction requester. Here, reading control means identifies the type of defective blocks registered on the defective block list and controls the reading according to the identification results.Type: GrantFiled: May 24, 2001Date of Patent: March 29, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masayuki Imada, Yoichi Yamamoto, Masahiro Kawasaki, Yoshinori Imanishi, Toru Suetomo
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Patent number: 6815924Abstract: A technique for controlling an AC motor. An electric power is output to the AC motor. The output current of an electric power converter is controlled based on a difference signal of an output current detection signal and a current command signal of the electric power converter. When the AC motor is in a free run condition, current control is conducted by forcing the current command signal to be zero so that a current in the AC motor is made zero. The amplitude and phase and angular velocity of a residual voltage of the AC motor are found based on a calculated output voltage command.Type: GrantFiled: March 19, 2002Date of Patent: November 9, 2004Assignee: Kabushiki Kaisha Yaskawa DenkiInventors: Hideaki Iura, Yoichi Yamamoto, Tomohiro Kawachi
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Publication number: 20040196761Abstract: Provided is a disc drive device that optimally controls a speed for reading RTR-format data, such as video and audio, recorded on a DVD-format disc, thereby enabling real-time playback without interruption. In the disc drive device, information added to each sector is used for determining whether data is RTR-format data. When an error occurs at high-speed reading of RTR-format data and therefore the reading speed is changed to a low speed, the reading speed is so controlled as to be kept at the low speed for reading the following RTR-format data. Thus, for RTR-format data, overhead due to repetitive acceleration and deceleration processes can be avoided, and reading can be carried out without interfering with real-time playback. For normal data, reading can be carried out in a manner similar to that in background art.Type: ApplicationFiled: April 22, 2004Publication date: October 7, 2004Inventors: Tohru Suetomo, Masahiro Kawasaki, Masayuki Imada, Yoichi Yamamoto
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Patent number: 6747927Abstract: Provided is a disc drive device that optimally controls a speed for reading RTR-format data, such as video and audio, recorded on a DVD-format disc, thereby enabling real-time playback without interruption. In the disc drive device, information added to each sector is used for determining whether data is RTR-format data. When an error occurs at high-speed reading of RTR-format data and therefore the reading speed is changed to a low speed, the reading speed is so controlled as to be kept at the low speed for reading the following RTR-format data. Thus, for RTR-format data, overhead due to repetitive acceleration and deceleration processes can be avoided, and reading can be carried out without interfering with real-time playback. For normal data, reading can be carried out in a manner similar to that in background art.Type: GrantFiled: May 30, 2002Date of Patent: June 8, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toru Suetomo, Masahiro Kawasaki, Masayuki Imada, Yoichi Yamamoto
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Patent number: 6728809Abstract: The present invention is built on a time out control apparatus to control the time out when a packet is transferred between terminal units connected to different buses. In the time out control apparatus, delay measuring means measures the delay time required for a response packet to be received after a request packet is sent to a terminal unit (control unit) connected via a bus. Delay information list generating means generates a delay information list in which the delay times measured by the delay measuring means are related to the individual identification information on the respective terminal units. Information output means reads out the delay time from the delay information list in accordance with a request from the terminal unit and outputs the delay time to the terminal unit. This sets the delay time on the time out register of the terminal unit.Type: GrantFiled: September 8, 2000Date of Patent: April 27, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Taisaku Suzuki, Yoichi Yamamoto, Mami Takahashi, Yasuo Hamamoto
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Publication number: 20040037233Abstract: The present invention is built on a time out control apparatus to control the time out when a packet is transferred between terminal units connected to different buses. In the time out control apparatus, delay measuring means measures the delay time required for a response packet to be received after a request packet is sent to a terminal unit (control unit) connected via a bus. Delay information list generating means generates a delay information list in which the delay times measured by the delay measuring means are related to the individual identification information on the respective terminal units. Information output means reads out the delay time from the delay information list in accordance with a request from the terminal unit and outputs the delay time to the terminal unit. This sets the delay time on the time out register of the terminal unit.Type: ApplicationFiled: August 8, 2003Publication date: February 26, 2004Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Taisaku Suzuki, Yoichi Yamamoto, Mami Takahashi, Yasuo Hamamoto
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Patent number: 6694312Abstract: In a database management system including a request reception server and a plurality of execution servers, each having a plug-in program module incorporated by a user, the request reception server analyzes a processing request from the user to determine whether or not the plurality of execution servers require currently unidentified input parameters when executing external functions in their plug-in modules, based on a definition information table created from descriptions of interface specifications for the plug-in program modules. When it is determined that the execution servers require such input parameters, an external function in the plug-in program module in the request reception server is executed to previously acquire the unidentified input parameters.Type: GrantFiled: February 6, 2001Date of Patent: February 17, 2004Assignee: Hitachi, Ltd.Inventors: Susumu Kobayashi, Yoichi Yamamoto, Masashi Tsuchida, Yukio Nakano, Norihiro Hara, Yoshito Kamegi
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Publication number: 20030231195Abstract: An image processing apparatus, for processing an image signal representing pixel values of pixels so as to display an image including the pixels by an image display apparatus, includes a detection section for detecting a low frequency portion of the image signal, which corresponds to a first series of pixels having a first pixel value and a second series of pixels having a second pixel value different from the first pixel value, the second series of pixels following the first series of pixels; and a signal expansion section for expanding a prescribed portion of the low frequency portion of the image signal, the prescribed portion including at least one of the first series of pixels and the second series of pixels, such that the first pixel value is gradually changed to the second pixel value.Type: ApplicationFiled: May 29, 2003Publication date: December 18, 2003Inventors: Satoshi Ueno, Yasuhiro Yoshida, Hiroyuki Furukawa, Yoichi Yamamoto, Akira Yamaguchi