Patents by Inventor Yoshitaka Zaitsu
Yoshitaka Zaitsu 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: 8256302Abstract: A capacitive electro-mechanical transducer includes a cell, the cell including a first electrode and a second electrode that is disposed opposite the first electrode with a gap therebetween; and a pressure-adjusting unit for adjusting pressure in the gap.Type: GrantFiled: May 24, 2010Date of Patent: September 4, 2012Assignee: Canon Kabushiki KaishaInventors: Kazunari Fujii, Yoshitaka Zaitsu
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Patent number: 8244146Abstract: There is provided an image forming apparatus and method capable of reducing a measurement error in a measurement result of the surface potential of an electrostatic latent image formed on the surface of an image bearing member. The measurement error occurs under the influence of an electric field generated from a pre-exposed area. Consequently, miniaturization of an image forming apparatus and consistent print quality can be achieved. The image forming apparatus includes an image forming control section for determining an error correction value corresponding to the charge state of a latent image on the basis of relationships between charge states of the latent image and error correction values which have been prepared in advance, computing an error corrected potential measurement value using the error correction value and a potential measurement value, and controlling the image forming apparatus on the basis of the error corrected potential measurement value.Type: GrantFiled: June 23, 2011Date of Patent: August 14, 2012Assignee: Canon Kabushiki KaishaInventors: Yoshitaka Zaitsu, Takashi Ushijima, Kaoru Noguchi, Kazuhiko Kato, Toshiyuki Ogawa
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Patent number: 8136212Abstract: A structure fabricating method plastically deforms a target portion of a substrate, to thereby fabricate a structure having an inclined segment that is inclined relative to a principal surface of the substrate. The method includes forming a projection on the target portion to project from the principal surface of the substrate or from an opposing surface of the substrate on the side opposite to the principal surface, and applying a force to the projection to plastically deform the target portion such that the target portion is bent in a direction from one surface of the substrate on the side where the projection is formed, toward another surface on the side opposite to the one surface.Type: GrantFiled: April 2, 2008Date of Patent: March 20, 2012Assignee: Canon Kabushiki KaishaInventors: Yoshitaka Zaitsu, Chienliu Chang, Masao Majima
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Patent number: 8082651Abstract: A micro-structure fabrication method fabricates a micro-structure including an inclined part inclined to a principal plane of a substrate by plastically deforming a work piece having the substrate with the principal plane. The structure fabrication method includes the steps of providing in the work piece a projection configured to protrude from a first surface and away from the principal plane of the substrate, and bending the work piece toward a second surface opposite to the first surface. The bending is accomplished by applying a force on a block including an inclined pressure plane that is abutted on the projection for plastically deforming the work piece, in which in bending the work piece, the direction of a first force applied on the work piece intersects with the direction of a second force of the inclined pressure plane pushing the projection.Type: GrantFiled: July 15, 2008Date of Patent: December 27, 2011Assignee: Canon Kabushiki KaishaInventors: Yoshitaka Zaitsu, Chienliu Chang, Masao Majima
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Publication number: 20110254405Abstract: An electromechanical transducer includes a plurality cells that are electrically connected to form a unit. Each of the cells includes a first electrode and a second electrode provided with a gap being disposed therebetween. Dummy cells that are not electrically connected to the cells are provided around the outer periphery of the unit of the cells.Type: ApplicationFiled: December 14, 2009Publication date: October 20, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Yoshitaka Zaitsu, Takehiko Kawasaki
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Publication number: 20110255890Abstract: There is provided an image forming apparatus and method capable of reducing a measurement error in a measurement result of the surface potential of an electrostatic latent image formed on the surface of an image bearing member. The measurement error occurs under the influence of an electric field generated from a pre-exposed area. Consequently, miniaturization of an image forming apparatus and consistent print quality can be achieved. The image forming apparatus includes an image forming control section for determining an error correction value corresponding to the charge state of a latent image on the basis of relationships between charge states of the latent image and error correction values which have been prepared in advance, computing an error corrected potential measurement value using the error correction value and a potential measurement value, and controlling the image forming apparatus on the basis of the error corrected potential measurement value.Type: ApplicationFiled: June 23, 2011Publication date: October 20, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Yoshitaka Zaitsu, Takashi Ushijima, Kaoru Noguchi, Kazuhiko Kato, Toshiyuki Ogawa
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Patent number: 7990159Abstract: A potential measurement apparatus for measuring a surface potential of an object of measurement detects a change in electric charge induced at a detection electrode due to electrostatic induction by changing a distance between the detection electrode and the object of measurement in accordance with a predetermined period, using a neutral distance as reference, as a signal representing a change in electric current.Type: GrantFiled: January 28, 2008Date of Patent: August 2, 2011Assignee: Canon Kabushiki KaishaInventors: Kazuhiko Kato, Toshiyuki Ogawa, Yoshitaka Zaitsu, Takashi Ushijima, Kaoru Noguchi, Atsushi Kandori, Futoshi Hirose
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Patent number: 7959843Abstract: In a method of fabricating a structure by plastically deforming a processing portion provided at a movable segment, a restraint segment configured to restrain movement of the movable segment is provided before an external force is applied to the processing portion. After processing of the processing portion is completed, the restraint segment is removed.Type: GrantFiled: June 18, 2009Date of Patent: June 14, 2011Assignee: Canon Kabushiki KaishaInventors: Yoshitaka Zaitsu, Chienliu Chang, Masao Majima, Hironobu Maeda
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Publication number: 20100300208Abstract: A capacitive electro-mechanical transducer includes a cell, the cell including a first electrode and a second electrode that is disposed opposite the first electrode with a gap therebetween; and a pressure-adjusting unit for adjusting pressure in the gap.Type: ApplicationFiled: May 24, 2010Publication date: December 2, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Kazunari Fujii, Yoshitaka Zaitsu
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Publication number: 20100259127Abstract: When the initial displacement greatly varies among cells in an element, there is a need to reduce a bias voltage to be applied between electrodes. This decreases the sensitivity. An electromechanical transducer of the present invention includes an element having a plurality of cells. Each of the cells includes a first electrode and a second electrode that are provided with a cavity being disposed therebetween. A groove is provided at a position at a predetermined distance from the cavity of the cell on the outermost periphery of the element.Type: ApplicationFiled: April 2, 2010Publication date: October 14, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Yoshitaka Zaitsu, Takehiko Kawasaki
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Patent number: 7741851Abstract: A potential measuring apparatus has a detection electrode on which an electric charge is induced according to a potential of a detection object, and a modulator for altering the generated quantity of the electric charge. The detection electrode has at least one depressed portion on a surface opposite to the detection object.Type: GrantFiled: May 12, 2008Date of Patent: June 22, 2010Assignee: Canon Kabushiki KaishaInventors: Takashi Ushijima, Yoshikatsu Ichimura, Atsushi Kandori, Yoshitaka Zaitsu
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Patent number: 7741850Abstract: An electric potential measuring apparatus including a substrate disposed facing a measurement object, a detecting electrode provided insulated from the substrate, and a capacity modulating unit for modulating a coupling capacity between the detecting electrode and the measurement object. In the electric potential measuring apparatus, a region with a dielectric constant less than a dielectric constant of the substrate is formed in the substrate to achieve an increase in resistivity of a portion of the substrate between detecting electrodes, or a decrease in a stray capacity between the detecting electrode and the substrate.Type: GrantFiled: March 21, 2006Date of Patent: June 22, 2010Assignee: Canon Kabushiki KaishaInventors: Yoshikatsu Ichimura, Yoshitaka Zaitsu, Takashi Ushijima, Atsushi Kandori
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Patent number: 7710129Abstract: A potential measurement apparatus is provided which can suitably maintain the oscillation state of an oscillator including a detection electrode and stably measure the potential of a measurement object. The potential measurement apparatus includes a bearing part, an elastic supporting part supported by the bearing part, an oscillator movably supported by the elastic supporting part, detection electrodes installed in the oscillator, a drive mechanism driving the oscillator and a signal detection unit. The signal detection unit is connected to the detection electrodes to detect electrical signals appearing in the detected electrodes. A stress detecting element for generating an electric signal according to the stress of the elastic suspension part 142 is provided.Type: GrantFiled: November 28, 2007Date of Patent: May 4, 2010Assignee: Canon Kabushiki KaishaInventors: Toshiyuki Ogawa, Yoshitaka Zaitsu, Takashi Ushijima, Atsushi Kandori, Kaoru Noguchi, Kazuhiko Kato, Futoshi Hirose
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Publication number: 20100019779Abstract: A potential measurement apparatus for measuring a surface potential of an object of measurement detects a change in electric charge induced at a detection electrode due to electrostatic induction by changing a distance between the detection electrode and the object of measurement in accordance with a predetermined period, using a neutral distance as reference, as a signal representing a change in electric current.Type: ApplicationFiled: January 28, 2008Publication date: January 28, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Kazuhiko Kato, Toshiyuki Ogawa, Yoshitaka Zaitsu, Takashi Ushijima, Kaoru Noguchi, Atsushi Kandori, Futoshi Hirose
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Patent number: 7639020Abstract: A potential sensor is provided in which the adhesion of toner particles to the potential sensor is reduced or prevented from occurring, reducing or preventing the occurrence of a situation that accurate detection cannot be performed. The potential sensor has a movable member, detecting electrodes formed on the movable member, a support which movably supports the movable member, a driving mechanism which drives the movable member, and a stationary member which supports the support. Between the movable member and the stationary member, a first gap is so formed as to make the movable member 101 movable. The first gap has a part that is not larger in width than the maximum size of toner particles when the movable member is not elastically deformed and is at a neutral position.Type: GrantFiled: October 25, 2007Date of Patent: December 29, 2009Assignee: Canon Kabushiki KaishaInventors: Takashi Ushijima, Kaoru Noguchi, Atsushi Kandori, Yoshitaka Zaitsu, Kazuhiko Kato, Toshiyuki Ogawa, Futoshi Hirose
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Publication number: 20090315217Abstract: In a method of fabricating a structure by plastically deforming a processing portion provided at a movable segment, a restraint segment configured to restrain movement of the movable segment is provided before an external force is applied to the processing portion. After processing of the processing portion is completed, the restraint segment is removed.Type: ApplicationFiled: June 18, 2009Publication date: December 24, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Yoshitaka Zaitsu, Chienliu Chang, Masao Majima, Hironobu Maeda
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Patent number: 7612569Abstract: Oscillating device including a movable member that is vibratable, a fixed section that is provided opposite to the movable member, a driving unit configured to drive the movable member, and at least two electrodes configured to generate a first signal corresponding to a drive state of the movable member. At least one electrode is provided on the movable member, and at least one electrode is provided on the fixed section. The driving unit can control the driving of the movable member on the basis of the first signal.Type: GrantFiled: February 1, 2007Date of Patent: November 3, 2009Assignee: Canon Kabushiki KaishaInventors: Takashi Ushijima, Yoshikatsu Ichimura, Atsushi Kandori, Yoshitaka Zaitsu
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Patent number: 7583086Abstract: A potential sensor including first and second detection electrodes opposed to an object of which a potential is to be measured, and a movable shutter so positioned between the detection electrodes and the potential-measured object with gaps thereto. The movable shutter can assume a first state and a second state. The first detection electrode is exposed to the potential-measured object wider when the movable shutter assumes the second state. The second detection electrode is exposed to the potential-measured object narrower when the movable shutter assumes the first state than when the movable shutter assumes the second state.Type: GrantFiled: July 5, 2007Date of Patent: September 1, 2009Assignee: Canon Kabushiki KaishaInventors: Susumu Yasuda, Takayuki Yagi, Takashi Ushijima, Yoshitaka Zaitsu, Yoshikatsu Ichimura
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Patent number: 7576546Abstract: An electric potential measuring device comprises a detection electrode of a conductive material disposed in opposition to an object and a movable structure comprised of a first solid material portion of a dielectric and a second solid material portion of another dielectric or a conductive material. A charge induced on the detection electrode by electric lines of force from the object is modulated by moving the movable structure with a drive mechanism, to measure an electric potential of the object. An image forming apparatus comprises the electric potential measuring device and an image forming means for performing a control of an image formation by using the electric potential measuring device.Type: GrantFiled: July 19, 2007Date of Patent: August 18, 2009Assignee: Canon Kabushiki KaishaInventors: Yoshikatsu Ichimura, Takayuki Yagi, Yoshitaka Zaitsu
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Patent number: 7554331Abstract: An electric potential measuring device has a detection electrode of a conductive material disposed in opposition to an object and a movable structure including a first solid material portion of a dielectric and a second solid material portion of another dielectric or a conductive material. A charge induced on the detection electrode by electric lines of force from the object is modulated by moving the movable structure with a drive mechanism, to measure an electric potential of the object. An image forming apparatus has the electric potential measuring device and an image forming unit for performing a control of an image formation by using the electric potential measuring device.Type: GrantFiled: March 28, 2007Date of Patent: June 30, 2009Assignee: Canon Kabushiki KaishaInventors: Yoshikatsu Ichimura, Takayuki Yagi, Yoshitaka Zaitsu