Patents by Inventor Yutaka Yamamoto

Yutaka 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).

  • Publication number: 20140233976
    Abstract: An image forming apparatus having: a power source applying alternating current voltage to the magnetizing coil; a demagnetizing coil switchable between a conductive state and a cutoff state, and when in the conductive state, cancelling out a portion of a magnetic flux produced by the magnetizing coil; a contact switch and a semiconductor switch electrically connected in parallel, and, in combination, bringing the demagnetizing coil into the conductive state or the cutoff state; and a control unit opening or closing the switches separately. The control unit: opens or closes the semiconductor switch in synchronization with a zero-crossing of the alternating current voltage at least when the contact switch is open; opens or closes the contact switch only when the semiconductor switch is closed; and opens the semiconductor switch when the demagnetizing coil brought into the conductive state by the contact switch needs to be maintained in the conductive state.
    Type: Application
    Filed: February 12, 2014
    Publication date: August 21, 2014
    Applicant: KONICA MINOLTA, INC.
    Inventors: Seiichi KIRIKUBO, Masahiro Kamiya, Takahiro Tsujimoto, Yutaka Yamamoto, Hidenori Mine, Nobuhiro Matsuo
  • Publication number: 20140219668
    Abstract: An image forming apparatus includes a timing roller for conveying paper in the image forming apparatus, a first motor receiving supply of electric power from a power source for driving the timing roller, a second motor receiving supply of electric power from the power source, a sensor for detecting whether a jam occurs at the conveyance roller, a drive relay for cutting off supply of electric power from the power source to the first and second motors, if occurrence of a jam is detected, and a control circuit for controlling an operating state of the second motor such that regenerative power produced at the first motor due to rotation of the conveyance roller is supplied to the second motor, if occurrence of a jam is detected.
    Type: Application
    Filed: January 31, 2014
    Publication date: August 7, 2014
    Applicant: KONICA MINOLTA, INC.
    Inventors: Hidenori Mine, Takahiro Tsujimoto, Masahiro Kamiya, Yutaka Yamamoto, Nobuhiro Matsuo, Seiichi Kirikubo
  • Publication number: 20140064768
    Abstract: An electromagnetic induction heating apparatus comprises: a resonance circuit that includes a inductor and a capacitor; a direct-current electric power supply; and a switching element performing ON and OFF switching of electric power supplied to the resonance circuit by the direct-current electric power supply; performs intermittent control of the electric power supply by controlling the ON and OFF switching at regular intervals, and by performing control to stop the electric power supply when not controlling the ON and OFF switching, wherein during the intermittent control, the switching control unit performs gradual control such that, upon beginning the control of the ON and OFF switching, the electric power supply gradually increases to reach a target value, and upon stopping the control of the ON and OFF switching, the electric power supply gradually decreases from the target value until stopping, such that the gradual decrease involves fewer steps than the gradual increase.
    Type: Application
    Filed: August 30, 2013
    Publication date: March 6, 2014
    Applicant: Konica Minolta, Inc.
    Inventors: Seiichi Kirikubo, Masaaki Goto, Yutaka Yamamoto, Takahiro Tsujimoto, Hiroyuki Watanabe, Hidenori Mine, Masato Ishii
  • Patent number: 8615179
    Abstract: While a recording sheet is passing through a fixing nip formed between a heating roller 41 having a heating layer and a pressing roller 42 pressed against the roller 41, a coil 43 is exited by high-frequency power from a power source and causes the layer to generate heat. An unfixed image on the recording sheet is fixed by the heat. The power source detects a zero cross timing of a rectified alternating current, detects an instantaneous value at a point a predetermined period after the zero cross timing, calculates an effective power of the alternating current based on the instantaneous value, and controls the output power to be a desired value determined based on the effective power and the surface temperature of the roller 41. Thus power input to the power source can be quickly detected and power output to the coil can be quickly and stably controlled.
    Type: Grant
    Filed: February 2, 2010
    Date of Patent: December 24, 2013
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Atsushi Yamaguchi, Seiichi Kirikubo, Akihiro Hayashi, Yutaka Yamamoto, Naoto Sugaya
  • Patent number: 8611680
    Abstract: An FFT analysis is performed on the decoded image data of one frame, and a cutoff frequency based on the assumption that the original signal has first-order attenuation characteristics is obtained in both the horizontal and vertical directions. A sampled-data H? filter (digital filter), previously designed to have different parameters corresponding to different cutoff frequencies is selected. By using this filter, a filtering process is performed on the image data decoded both in the horizontal and vertical directions. Since the variety of the analog frequency characteristics of the original image is taken into account for every frame of the image, the information that seems to be noise in the original image is less likely to be removed, and mosquito noise and block noise associated with a coding/decoding process can be efficiently removed.
    Type: Grant
    Filed: November 11, 2008
    Date of Patent: December 17, 2013
    Assignee: Kyoto University
    Inventors: Yutaka Yamamoto, Masaaki Nagahara, Akira Kobayashi
  • Patent number: 8530202
    Abstract: A method for manufacturing a linear-chain beta-1,3-glucan is disclosed that comprises polymerizing glucose-1-phosphate serving as a substrate by contacting the glucose-1-phosphate with a beta-1,3-glucan phosphorylase derived from a species in the genus Ochromonas. A laminarioligosaccharide may be added to serve as a primer. A linear-chain beta-1,3-glucan having a degree of polymerization between about 30 to 70 is also disclosed.
    Type: Grant
    Filed: February 11, 2010
    Date of Patent: September 10, 2013
    Assignee: Mie University
    Inventors: Naoto Isono, Yutaka Yamamoto, Wataru Saburi
  • Patent number: 8488823
    Abstract: A hearing aid tailored to a hard-of-hearing person is designed using sampled-data control theory. The method is for designing an audio signal processing system for a hearing aid, wherein the system comprises an AD converter for converting an analog audio input signal (yc) inputted to the hearing aid into a digital audio input signal, a hearing aid digital filter (K(z)) for performing a signal processing on the digital audio input signal outputted from the AD converter, and a DA converter for converting a digital signal outputted from the hearing aid digital filter into an analog audio output signal to be outputted to the hard-of-hearing person.
    Type: Grant
    Filed: August 3, 2009
    Date of Patent: July 16, 2013
    Assignee: Kyoto University
    Inventors: Yutaka Yamamoto, Masaaki Nagahara
  • Publication number: 20130150993
    Abstract: A method for designing a control apparatus includes: determining first, second and third threshold values; setting a first weighting function for calculating a first controlled variable by being multiplied by a difference between a control target value and an output value of a storage battery, a second weighting function for calculating a second controlled variable by being multiplied by the output value of the storage battery, and a third weighting function for calculating a third controlled variable by being multiplied by an integrated value of the output value of the storage battery; and determining a transfer function of the control apparatus in accordance with an H-infinity control theory such that the first controlled variable, the second controlled variable and the third controlled variable are respectively smaller than the first, second and third threshold values.
    Type: Application
    Filed: May 28, 2012
    Publication date: June 13, 2013
    Inventors: Seiya Miyazaki, Takahiro Kudoh, Yutaka Yamamoto, Masaaki Nagahara
  • Publication number: 20120328213
    Abstract: Super-resolution processing is regarded as a kind of intersample interpolation process and performed by using a linear interpolation filter designed according to sampled-data control theory. In an error-system model used in the process of designing the filter, a pre-filter is disposed before a sampler and a post-filter is disposed after the zero-order hold in a signal restoration system. At least either one of the characteristic Q(s) of the pre-filter or the characteristic P(s) of the post-filter is designed to be a low-pass characteristic, whereby the gain of the characteristic K(z) of a digital filter within a middle-to-high frequency range is raised. Raising the gain makes jaggies more prominent. To reduce this effect, in an actual processing system, the image to be processed is passed through a low-pass filter to reduce high-frequency components before the linear interpolation is performed.
    Type: Application
    Filed: February 3, 2012
    Publication date: December 27, 2012
    Inventors: Yutaka YAMAMOTO, Kengo ZENITANI
  • Publication number: 20120275810
    Abstract: An induction heating device including a coil which inductively heats a workpiece of a fuser with an input voltage obtained from an alternating current voltage by rectification; a switching element coupled in series with the coil; a peak voltage detector which detects a peak value of the input voltage; an effective voltage detector which detects an effective value of the input voltage; a crest factor calculator which calculates an actual crest factor of the input voltage based on the peak value of the input voltage and the effective value of the input voltage; and a power controller which achieves control of power to the fuser by controlling the duty ratio of ON and OFF periods of the switching element.
    Type: Application
    Filed: April 26, 2012
    Publication date: November 1, 2012
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Atsushi YAMAGUCHI, Seiichi Kirikubo, Yutaka Yamamoto, Takahiro Tsujimoto, Hiroyuki Watanabe, Hidenori Mine, Masato Ishii
  • Publication number: 20120241442
    Abstract: An induction heating device comprises: a resonant circuit provided with a coil heating a workpiece inductively and a capacitor, the coil and the capacitor being coupled in parallel with each other; a switching element coupled in series with the resonant circuit; a power supply which applies to the resonant circuit, a direct-current input voltage whose instantaneous value can be changed with the lapse of time; and a power controller which controls power to the workpiece by turning the switching element ON at a certain time and changing an ON period of the switching element, and the power controller is characterized by turning the switching element ON with a delay of an integral multiple of a resonant period of the resonant circuit if a value of power to the workpiece is equal to or lower than a first threshold which is predetermined.
    Type: Application
    Filed: March 23, 2012
    Publication date: September 27, 2012
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Seiichi KIRIKUBO, Atsushi Yamaguchi, Yutaka Yamamoto, Takahiro Tsujimoto, Hiroyuki Watanabe, Hidenori Mine, Masato Ishii
  • Patent number: 8123600
    Abstract: A game apparatus causes a character object to perform a first hitting motion on the necessary condition that a to-be-hit object is present in a first area 104a which is set based on a position of the character object in a virtual game space, and causes the character object to perform a second hitting motion on the necessary condition that the to-be-hit object is present in a second area 104b, 104c, or 104d. Furthermore, the game apparatus adjusts a position of at least one of at least a part of the character object and the to-be-hit object, such that when the character object is caused to perform the second hitting motion, the character object and the to-be-hit object are in a predetermined positional relationship.
    Type: Grant
    Filed: May 6, 2005
    Date of Patent: February 28, 2012
    Assignee: Nintendo Co., Ltd.
    Inventors: Hiroyuki Takahashi, Shugo Takahashi, Yusuke Sugimoto, Yutaka Yamamoto, Toshiharu Izuno
  • Publication number: 20110319609
    Abstract: A method for manufacturing a linear-chain beta-1,3-glucan is disclosed that comprises polymerizing glucose-1-phosphate serving as a substrate by contacting the glucose-1-phosphate with a beta-1,3-glucan phosphorylase derived from a species in the genus Ochromonas. A laminarioligosaccharide may be added to serve as a primer. A linear-chain beta-1,3-glucan having a degree of polymerization between about 30 to 70 is also disclosed.
    Type: Application
    Filed: February 11, 2010
    Publication date: December 29, 2011
    Applicant: MIE UNIVERSITY
    Inventors: Naoto Isono, Yutaka Yamamoto, Wataru Saburi
  • Publication number: 20110271593
    Abstract: Disclosed is a vehicle passage control device capable of suppressing damage and breakage of an opening/closing bar thereof to the minimum, and suppressing damage and the like of a vehicle to the minimum even if the vehicle collides with the opening/closing bar. The vehicle passage control device is a vehicle passage control device in which an opening/closing bar 12 that regulates passage of a vehicle is provided, the vehicle passage control device being installed at a passage gate of an entrance or exit of a toll road or the like. The vehicle passage control device performs opening/closing control for the opening/closing bar 12 to rotationally move and upspring obliquely upward in front in a passing direction of the vehicle. An inclined angle ? at which the opening/closing bar 12 rotationally moves and upsprings obliquely upward remains within a range from approximately 25 degrees to approximately 55 degrees with respect to a road surface.
    Type: Application
    Filed: February 24, 2010
    Publication date: November 10, 2011
    Inventors: Shinichi Hayashida, Toshio Uchimaru, Yutaka Yamamoto
  • Publication number: 20110135130
    Abstract: A hearing aid tailored to a hard-of-hearing person is designed using sampled-data control theory. The method is for designing an audio signal processing system for a hearing aid, wherein the system comprises an AD converter for converting an analog audio input signal (yc) inputted to the hearing aid into a digital audio input signal, a hearing aid digital filter (K(z)) for performing a signal processing on the digital audio input signal outputted from the AD converter, and a DA converter for converting a digital signal outputted from the hearing aid digital filter into an analog audio output signal to be outputted to the hard-of-hearing person.
    Type: Application
    Filed: August 3, 2009
    Publication date: June 9, 2011
    Applicant: KYOTO UNIVERSITY
    Inventors: Yutaka Yamamoto, Masaaki Nagajara
  • Publication number: 20110002552
    Abstract: An FFT analysis is performed to the image data of one frame which has been decoded, and a cutoff frequency on the assumption that the original signal has first-order attenuation characteristics is obtained each in the horizontal direction and in the vertical direction. A sampled-data H? filter (digital filter) which has been previously designed in such a manner as to have different parameters corresponding to different cutoff frequencies is selected. By using this filter, a filtering process is performed to the image data which has been decoded both in the horizontal direction and in the vertical direction. Since the variety of the analog frequency characteristics of the original image is taken into account for every frame of image, the information that seems to be a noise yet actually exists in the original image is less likely to be removed, and a mosquito noise and block noise associated with a coding/decoding process can be efficiently removed.
    Type: Application
    Filed: November 26, 2008
    Publication date: January 6, 2011
    Applicant: KYOTO UNIVERSITY
    Inventors: Yutaka Yamamoto, Masaaki Nagahara, Akira Kobayashi
  • Publication number: 20100196038
    Abstract: While a recording sheet is passing through a fixing nip formed between a heating roller 41 having a heating layer and a pressing roller 42 pressed against the roller 41, a coil 43 is exited by high-frequency power from a power source and causes the layer to generate heat. An unfixed image on the recording sheet is fixed by the heat. The power source detects a zero cross timing of a rectified alternating current, detects an instantaneous value at a point a predetermined period after the zero cross timing, calculates an effective power of the alternating current based on the instantaneous value, and controls the output power to be a desired value determined based on the effective power and the surface temperature of the roller 41. Thus power input to the power source can be quickly detected and power output to the coil can be quickly and stably controlled.
    Type: Application
    Filed: February 2, 2010
    Publication date: August 5, 2010
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Atsushi YAMAGUCHI, Seiichi Kirikubo, Akihiro Hayashi, Yutaka Yamamoto, Naoto Sugaya
  • Patent number: 7324024
    Abstract: A high frequency compensator configured to compensate high frequency component of a digital audio signal comprising a down sampler configured to perform ½ down-sampling for the digital audio signal. An up sampler is configured to perform double up-sampling for an output signal of the down-sampler. A digital low-pass filter is configured to filter an output signal of the up sampler, and to output the filtered digital audio signal.
    Type: Grant
    Filed: February 28, 2006
    Date of Patent: January 29, 2008
    Assignees: Sanyo Electric Co., Ltd.
    Inventors: Koji Fujiyama, Naoya Iwasaki, Yumi Hirasawa, Yutaka Yamamoto
  • Patent number: 7277259
    Abstract: A magnetic head actuator includes a head-holding substrate having a pair of movable arms for clamping a magnetic head, and piezoelectric elements fixed along the pair of movable arms to move the pair of movable arms in response to an applied voltage. The head-holding substrate comprises a fired glass-ceramic compact containing at least one of SiO2, B2O3, and Al2O3. The piezoelectric elements are formed on the head-holding substrate with a piezoelectric material by printing and low-temperature firing.
    Type: Grant
    Filed: February 6, 2004
    Date of Patent: October 2, 2007
    Assignee: Alps Electric Co., Ltd.
    Inventors: Yutaka Yamamoto, Jun-ichi Murakami, Hiroya Sawairi
  • Publication number: 20060267825
    Abstract: A high frequency compensator configured to compensate high frequency component of a digital audio signal comprising a down sampler configured to perform ½ down-sampling for the digital audio signal. An up sampler is configured to perform double up-sampling for an output signal of the down-sampler. A digital low-pass filter is configured to filter an output signal of the up sampler, and to output the filtered digital audio signal.
    Type: Application
    Filed: February 28, 2006
    Publication date: November 30, 2006
    Applicants: SANYO ELECTRIC CO., LTD.
    Inventors: Koji FUJIYAMA, Naoya IWASAKI, Yumi HIRASAWA, Yutaka YAMAMOTO