Patents by Inventor Tetsuya Sakamoto
Tetsuya Sakamoto 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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Publication number: 20110267378Abstract: A method for driving a plasma display panel is provided in which wasteful power consumption is reduced and light emission efficiency is improved when the number of cells to be lighted is relatively small. The method includes classifying a display ratio into plural group ranges, selecting a suitable display pulse waveform for each group range, detecting the display ratio of an object to be displayed in a real display, and plural types of display pulses having different waveforms are used differently in accordance with the result of the detection. The display ratio means a ratio of the number of cells to be lighted to the number of cells of the screen.Type: ApplicationFiled: July 5, 2011Publication date: November 3, 2011Applicants: HITACHI PLASMA DISPLAY LIMITED, HITACHI PLASMA PATENT LICENSING CO., LTD.Inventors: Naoki Itokawa, Yoshiho Seo, Yasunobu Hashimoto, Tetsuya Sakamoto, Tomokatsu Kishi
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Patent number: 8040295Abstract: In a PDP apparatus provided with a PDP having (X, Y, A) and various drivers, two adjacent Ys in a plurality of Ys are commonly connected by a wiring so as to form one set unit, in the vicinity of a connection portion of the PDP and the drivers. A two-stage reset and address operation control using a reset operation including an address disable operation is used for a control unit including a plurality of display lines (L) of the set units. In a plurality of Ls as objects of drive display, the reset and address operation of first Ls (Lo) corresponding to Ys on one side of set units and that of second Ls (Le) corresponding to Ys on the other side thereof are performed separately in former and latter periods, and then, sustain operations of the first and second Ls on both sides are performed simultaneously.Type: GrantFiled: February 7, 2007Date of Patent: October 18, 2011Assignee: Fujitsu Hitachi Plasma Display LimitedInventors: Akihiro Takagi, Tetsuya Sakamoto, Takashi Shiizaki
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Patent number: 7995007Abstract: A method for driving a plasma display panel is provided in which wasteful power consumption is reduced and light emission efficiency is improved when the number of cells to be lighted is relatively small. The method includes classifying a display ratio into plural group ranges, selecting a suitable display pulse waveform for each group range, detecting the display ratio of an object to be displayed in a real display, and plural types of display pulses having different waveforms are used differently in accordance with the result of the detection. The display ratio means a ratio of the number of cells to be lighted to the number of cells of the screen.Type: GrantFiled: April 9, 2008Date of Patent: August 9, 2011Assignees: Hatachi Plasma Patent Licensing Co., Ltd., Hitachi Plasma Display LimitedInventors: Naoki Itokawa, Yoshiho Seo, Yasunobu Hashimoto, Tetsuya Sakamoto, Tomokatsu Kishi
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Patent number: 7990341Abstract: A technique which enables improvement of luminance and reduction of consumption power in a sustain discharge driving of a four-electrode structure PDP, particularly, by devising driving method to Z electrodes. In this plasma display device, a sustain discharge by a method to apply a narrow pulse to the Z electrode and a method to apply a fixed potential to the Z electrode are switched according to a judgment of range of display load ratio in driving sustain discharge from a controller and driver to the PDP and used.Type: GrantFiled: July 26, 2005Date of Patent: August 2, 2011Assignee: Fujitsu Hitachi Plasma Display LimitedInventors: Naoki Itokawa, Tetsuya Sakamoto, Takayuki Kobayashi, Tomokatsu Kishi, Yasunobu Hashimoto
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Publication number: 20110157295Abstract: An exposure device of an aspect of the present invention includes an exposure unit that is provided between a body to be exposed and a component and that exposes the body to be exposed; and an electrical connection member that is electrically connected to a connecting portion disposed in the exposure unit and includes a first bent portion formed by bending the electrical connection member at an outer side of a clearance between the body to be exposed and the component and a second bent portion formed by bending the electrical connection member on an opposite side of the exposure unit with respect to the first bent portion.Type: ApplicationFiled: May 18, 2010Publication date: June 30, 2011Applicant: FUJI XEROX CO., LTD.Inventor: Tetsuya SAKAMOTO
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Patent number: 7911419Abstract: In a conventional method of driving a plasma display panel, for example, an auxiliary discharge is executed between an A electrode and a Y electrode to improve light-emission efficiency of a display discharge. However, since a phosphor layer is present between the A electrode and the Y electrode, the phosphor layer is exposed to a discharge, whereby there is a problem that its characteristic deteriorates. A method of driving a plasma display panel having a structure, in which at least three display electrodes X, Y, and Z used for a display discharge are provided to a display cell and no phosphor layer is formed between said display electrodes and a discharge space, the method comprising the steps of: varying a potential of at least one display electrode Z of said display electrodes during said display discharge; and making a potential of said at least one display electrode Z at a time of starting said display discharge different from that at a time of ending said display discharge.Type: GrantFiled: December 27, 2005Date of Patent: March 22, 2011Assignee: Fujitsu Hitachi Plasma Display LimitedInventors: Yasunobu Hashimoto, Tomokatsu Kishi, Tetsuya Sakamoto, Naoki Itokawa, Takayuki Kobayashi, Yoshimi Kawanami, Osamu Toyoda, Yasuhiko Kunii, Takahiro Takamori, Kunio Takayama
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Patent number: 7880689Abstract: There is provided a drive circuit of a display device using a capacitive load which includes a clamp circuit connected to a power source potential and clamping a potential of the capacitive load to the power source potential such that an electric power is supplied to the capacitive load in a temporally dispersed manner. For example, the clamp circuit includes a plurality of switches parallelly connected between the capacitive load and the power source potential, the plurality of switches being turned on at different times.Type: GrantFiled: July 15, 2005Date of Patent: February 1, 2011Assignee: Fujitsu Hitachi Plasma Display LimitedInventors: Tomokatsu Kishi, Tetsuya Sakamoto, Akihiro Takagi, Satoru Nishimura, Yoshikazu Kanazawa, Takayuki Kobayashi, Takashi Sasaki, Yasunobu Hashimoto
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Publication number: 20100296186Abstract: An optical component bowing device includes a bending moment generating structure. In a particular embodiment, the bending moment generating structure can have extension members that extend in a direction substantially orthogonal to a longitudinal direction of an optical component. The extension members can be positioned adjacent longitudinal end portions of the optical component. The bending moment generating structure can also have loading members that load the extension members in a direction that is parallel to a longitudinal direction of the optical component, whereby displacement of the extension members can generate a bending moment in a supported portion of the optical component that reflects or shapes a light beam. The bending moment generating structure can also include a reflective surface. Extension members on at least one end of the optical component can be T-shaped when seen in plan view in a direction orthogonal to the reflective surface.Type: ApplicationFiled: July 30, 2010Publication date: November 25, 2010Applicant: FUJI XEROX CO., LTD.Inventors: Tetsuya SAKAMOTO, Katsuyuki YANAGISAWA, Katsuhiko NAKAIE
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Publication number: 20100290811Abstract: An optical device includes an optical component that reflects or shapes a light beam. In a particular embodiment, the optical device can include a bending moment generating structure that generates a bending moment in a supported portion of the optical component. The optical device can also include an adjusting mechanism that adjusts the bowing amount of the optical component by adjusting the bending moment of the bending moment generating structure.Type: ApplicationFiled: July 30, 2010Publication date: November 18, 2010Applicant: FUJI XEROX CO., LTD.Inventors: Tetsuya SAKAMOTO, Katsuyuki YANAGISAWA, Katsuhiko NAKAIE
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Publication number: 20100271351Abstract: A plasma display device includes a plasma display panel and a driver unit driving the plasma display panel. The plasma display panel includes a first plate on which a sustain electrode and a scan electrode, a dielectric layer, an address electrode extending in a direction intersecting with the sustain electrode, and a protective layer are sequentially stacked and a second plate disposed to face the first plate via a discharge space. On the second plate, a barrier rib extending in the direction intersecting with the sustain electrode is formed. One edge part of the address electrode lies on the barrier rib and the other edge part of the address electrode lies on the discharge space. During an address period, the driver unit applies a scan pulse operating as an anode to the scan electrode and applies an address pulse operating as a cathode to the address electrode. This makes it possible to prevent erroneous discharge.Type: ApplicationFiled: July 27, 2007Publication date: October 28, 2010Inventors: Akihiro Takagi, Tetsuya Sakamoto, Takashi Sasaki
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Publication number: 20100245525Abstract: The image forming apparatus includes: an image carrier; an exposure head provided along a longitudinal direction of the image carrier, and exposing the image carrier; a housing holding the exposure head; an opening portion formed in the housing, and opening toward a position through which the image carrier and the exposure head face each other; a receiving portion provided in the housing; and a cleaning member having one and different ends, and including: a cleaning portion provided on a one end side where the one end is located, and cleaning a light-emitting face of the exposure head by moving while keeping in contact with the light-emitting face; and a guiding portion coming in contact with the receiving portion and guiding the cleaning portion toward a space between the image carrier and the exposure head when the cleaning portion is inserted into an interior of the housing through the opening portion.Type: ApplicationFiled: August 14, 2009Publication date: September 30, 2010Inventors: Daiki Morimoto, Tetsuya Sakamoto
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Publication number: 20100238257Abstract: The exposure device is provided with: an exposure unit that has one end and a different end, that includes plural light-emitting elements arranged in a first direction along a direction of a rotational axis of a rotating image carrier, and that exposes the image carrier; a one-end-side holding portion that holds a one end part, on the one end side, of the exposure unit; a first reference part that is formed in the one-end-side holding portion, and that serves as a reference for aligning the exposure unit in the first direction by bringing the one end part of the exposure unit into contact with the first reference part; and an application portion that applies, to the one end part of the exposure unit, force with which the one end part of the exposure unit is pressed against the first reference part.Type: ApplicationFiled: August 14, 2009Publication date: September 23, 2010Inventor: Tetsuya Sakamoto
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Publication number: 20100232092Abstract: An image writing unit includes an image writing member writing images to an image holding member on a recording device body, a support mechanism including a supporting section allowing the writing member to be supported on a cover opened and closed for the device body, and a supported section on the member to be supported, the support mechanism supporting the writing member on the cover when the cover opens, and a positioning mechanism including a positioning section on the device body for positioning the writing member, and a positioned section on the member to be positioned, the positioning mechanism positioning the member for the holding member depending on a relationship between the positioning and positioned sections when the cover is closed. The supporting or supported section has a guide surface along a direction perpendicular to the open/close direction, and the other section allows the writing member to swing upon positioning the member.Type: ApplicationFiled: October 29, 2009Publication date: September 16, 2010Applicant: FUJI XEROX CO., LTD.Inventor: Tetsuya SAKAMOTO
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Patent number: 7791623Abstract: An optical component bowing device is configured to include a bending moment generating structure that generates a bending moment in a supported portion of an optical component that reflects or shapes a light beam.Type: GrantFiled: April 12, 2007Date of Patent: September 7, 2010Assignee: Fuji Xerox Co., Ltd.Inventors: Tetsuya Sakamoto, Katsuyuki Yanagisawa, Katsuhiko Nakaie
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Publication number: 20100220115Abstract: A plasma display device has a plasma display panel (PDP) and a driver unit driving the PDP. One field for displaying one screen of the PDP is made up of a plurality of subfields having a reset period and an address period. At least one of the plurality of subfields is a subfield for low luminance with number of times of sustain discharge being set to 0 (zero) and a voltage between a scan electrode and a sustain electrode during the address period being set smaller than a firing voltage between the scan electrode and the sustain electrode. The driver unit applies between the scan electrodes and the sustain electrodes a voltage smaller than the firing voltage between the scan electrodes and the sustain electrodes in a reset period of a subfield subsequent to the subfield for low luminance. As a result, luminance when reproducing black can be lowered.Type: ApplicationFiled: December 17, 2007Publication date: September 2, 2010Inventors: Tetsuya Sakamoto, Takashi Sasaki, Akihiro Takagi
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Patent number: 7746295Abstract: There is provided a plasma display device capable of high luminous efficacy and stable driving for displaying images at various image display load factors. The plasma display device performs the sustain discharge for a light-emission display, and is configured to apply a sustain pulse voltage between a sustain electrode pair in a respective one of the plural discharge cells to generate a sustain discharge in a respective one of the following operating modes selected based upon use of the plasma display device: (a) generating a pre-discharge and then a main discharge; (b) generating a main discharge without a pre-discharge preceding the main discharge; and (c) switching between the mode (a) and the mode (b). The sustain voltage waveforms are used which compensate for an increase in voltage drop due to an increase in discharge current when the image display load factor is excessively increased.Type: GrantFiled: October 20, 2006Date of Patent: June 29, 2010Assignee: Hitachi, Ltd.Inventors: Kenichi Yamamoto, Keizo Suzuki, Masatoshi Shiiki, Kyoji Kariya, Tomokatsu Kishi, Tetsuya Sakamoto, Takashi Sasaki, Takayuki Shimizu
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Patent number: 7633497Abstract: An air purifier includes a main body defining an air passage therein to allow sucked air to pass therethrough prior to being discharged, and a first filter installed in the main body to be switched between a closed state and an open state. The first filter removes contaminants from the sucked air in the closed state, and allows the sucked air to pass through the air passage in the open state. The air purifier may include a main body to suck and discharge air, with a bypass passage formed in the main body so that the bypass passage is opened or closed by a door, and a first filter installed in the main body. The sucked air passes through the first filter prior to being discharged when the door is closed, and passes through the bypass passage prior to being discharged when the door is opened.Type: GrantFiled: November 10, 2004Date of Patent: December 15, 2009Assignee: Fujitsu Hitachi Plasma Display LimitedInventors: Tomoya Matsui, Shigetoshi Tomio, Akihiro Takagi, Tetsuya Sakamoto, Tomokatsu Kishi
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Patent number: 7570231Abstract: A method for driving a plasma display panel is provided in which wasteful power consumption is reduced and light emission efficiency is improved when the number of cells to be lighted is relatively small. The method includes classifying a display ratio into plural group ranges, selecting a suitable display pulse waveform for each group range, detecting the display ratio of an object to be displayed in a real display, and plural types of display pulses having different waveforms are used differently in accordance with the result of the detection. The display ratio means a ratio of the number of cells to be lighted to the number of cells of the screen.Type: GrantFiled: March 24, 2004Date of Patent: August 4, 2009Assignee: Hitachi, Ltd.Inventors: Naoki Itokawa, Yoshiho Seo, Yasunobu Hashimoto, Tetsuya Sakamoto, Tomokatsu Kishi
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Publication number: 20090167752Abstract: A technique capable of enhancing performance of a reset operation by a reset waveform using a step-wise rectangular wave and obtaining stable display characteristics in a subfield drive control of a PDP device is provided. In the PDP driving method, in the drive control of the subfield, a reset waveform including a rectangular wave raised in a plurality of steps in a step-wise manner is used in the reset operation, and the application timing of a partial waveform having one or more steps previous to a second step in the rectangular wave is shifted according to the number of sustains previous to the reset operation.Type: ApplicationFiled: August 9, 2006Publication date: July 2, 2009Inventors: Akihiro Takagi, Tetsuya Sakamoto
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Publication number: 20090153543Abstract: In a technique of a PDP having a four-electrode structure of (X, Y, Z, and A), the technique capable of preventing a delay of a discharge timing due to a voltage applied to the Z electrode is provided. In the four-electrode product structure of (X, Y, Z, and A) and a PDP in which rows are formed at both sides of a Y electrode, for a voltage waveform applied to each electrode (for example, X1, Zo, Y1, Ze, X2, Zo, and Y2) from the drive circuit side, a voltage (Vt) of the narrow width trigger pulse (65) of a positive polarity applied to the Z electrode is configured to be a voltage higher than the voltage (Vs) of the sustain pulses of X and Y (45, 46, 55, and 56).Type: ApplicationFiled: February 1, 2006Publication date: June 18, 2009Applicant: FUJITSU HITACHI PLASAMA DISPLAY LIMITEDInventors: Takashi Sasaki, Tetsuya Sakamoto, Naoki Itokawa, Takayuki Kobayashi