Patents by Inventor Shinji Yasukawa
Shinji Yasukawa 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: 7391399Abstract: The present invention provides a display device which can suppress the increase of a chip size while reducing the number of transistors of a decoder circuit compared to the prior art. Assuming m (m being an integer of 2 or more) as a lower-order bit in accordance with n-bit display data, a drive part includes a gray-scale voltage generating circuit which generates M pieces of gray-scale voltages where the gray scale number with respect to the gray-scale voltages is discontinuous, a decoder circuit which selects two neighboring gray-scale voltages out of M pieces of gray-scale voltages based on data of upper-order (n-m) bits in accordance with n-bit display data, and an output amplifying circuit which generates gray-scale voltages between two gray-scale voltages from two gray-scale voltages selected by the decoder circuit based on the data of lower-order m bits in accordance with n-bit display data and outputs the gray-scale voltages to the video lines.Type: GrantFiled: November 22, 2004Date of Patent: June 24, 2008Assignee: Hitachi Displays, Ltd.Inventors: Hidenori Kikuchi, Shinji Yasukawa, Hiroshi Watanabe
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Publication number: 20080138101Abstract: A color image forming apparatus includes, for each of liquid developers of plural colors, a photosensitive member, a developing roller, an agitating device that agitates a liquid developer having a viscosity characteristic dependent on a shearing force, and a developer supplying unit that supplies the liquid developer to the developing roller. In development, agitation start timing is varied depending on the color of the liquid developer.Type: ApplicationFiled: October 19, 2007Publication date: June 12, 2008Applicant: SEIKO EPSON CORPORATIONInventors: Shinji YASUKAWA, Nobuhiro MIYAKAWA, Ken IKUMA
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Patent number: 7356281Abstract: The present invention provides a toner having: a toner mother particle; a first external additive including a first inorganic fine particle having a primary particle size distribution of 200 to 750 nm and a work function approximately equivalent to that of the toner mother particle; a second external additive including a second inorganic fine particle having an mean particle size smaller than that of the first inorganic fine particle and a work function smaller than that of the toner particle, a stirring member of a developing device and/or an inner wall of the developing device; and 0.01% to 0.3% by weight of a metal soap having a work function approximately equivalent to that of the toner mother particle.Type: GrantFiled: March 21, 2005Date of Patent: April 8, 2008Assignee: Seiko Epson CorporationInventors: Nobuhiro Miyakawa, Shinji Yasukawa, Hiroyuki Murakami
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Publication number: 20080042158Abstract: A display device having a display element is configured such that the extending directions of electrodes are made different from each other among upper, lower, left and right pixels.Type: ApplicationFiled: October 2, 2007Publication date: February 21, 2008Inventors: Ryutaro Oke, Kazunori Ojima, Masaki Tsubokura, Masashi Baba, Yasuhiko Yamagishi, Masahiro Tanaka, Yuuichi Takenaka, Shinji Yasukawa, Kikuo Ono
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Publication number: 20080043193Abstract: A display device having a display element is configured such that the extending directions of electrodes are made different from each other among upper, lower, left and right pixels.Type: ApplicationFiled: October 2, 2007Publication date: February 21, 2008Inventors: Ryutaro Oke, Kazunori Ojima, Masaki Tsubokura, Masashi Baba, Yasuhiko Yamagishi, Masahiro Tanaka, Yuuichi Takenaka, Shinji Yasukawa, Kikuo Ono
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Publication number: 20080043415Abstract: A display device having a display element is configured such that the extending directions of electrodes are made different from each other among upper, lower, left and right pixels.Type: ApplicationFiled: October 2, 2007Publication date: February 21, 2008Inventors: Ryutaro Oke, Kazunori Ojima, Masaki Tsubokura, Masashi Baba, Yasuhiko Yamagishi, Masahiro Tanaka, Yuuichi Takenaka, Shinji Yasukawa, Kikuo Ono
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Publication number: 20080008953Abstract: A liquid developer includes a vegetable oil as a carrier liquid, a positively chargeable pigment and an antioxidant including a trialkyl phosphite represented by the chemical formula 1 and/or a diphenyl alkyl phosphite represented by the chemical formula 2: (CmH2m+1O)3PChemical formula 1 wherein m is 2 to 20, wherein n is 5 to 15.Type: ApplicationFiled: June 26, 2007Publication date: January 10, 2008Applicant: SEIKO EPSON CORPORATIONInventors: Nobuhiro MIYAKAWA, Shinji YASUKAWA
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Publication number: 20070063960Abstract: The present invention provides a technique which, in a display device, can easily realize the inversion of an image displayed on a display panel in the lateral direction as well as in the vertical direction without requiring an external switching part for changing over a start pulse, the changeover of a signal and the like.Type: ApplicationFiled: September 6, 2006Publication date: March 22, 2007Inventors: Haruhisa Iida, Mamoru Yamanaka, Yukihide Ode, Shinji Yasukawa
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Patent number: 7135260Abstract: The invention provides an imaging system wherein toners of two or more colors are used to form toner images and the toner images are successively used to form a color image on a recording material. The imaging system can form an image with high transfer efficiency. An electrostatic latent image is formed on an image carrier. Using developing units for two or more colors, images are formed. Then, the images are successively transferred onto an intermediate transfer medium at a transfer voltage fed from a constant-voltage power supply. The developing units are located such that development occurs in descending toner work function order.Type: GrantFiled: January 5, 2004Date of Patent: November 14, 2006Assignee: Seiko Epson CorporationInventors: Nobuhiro Miyakawa, Shinji Yasukawa, Mikio Furumizu, Nobumasa Abe, Masanao Kunugi, Yoshiro Koga
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Patent number: 7106295Abstract: The present invention realizes proper driving circuits in a driving-circuit integral type liquid crystal display device which has an increased screen size. The liquid crystal display device includes a liquid crystal display panel and a driving circuit which supplies video signals to video signal lines formed on the liquid crystal display panel. The driving circuit is comprised of a first driving circuit which is formed in a step similar to a step for forming pixels provided to the liquid crystal display panel and a second driving circuit which is connected to the liquid crystal display panel after formation of the liquid crystal display panel. The first driving circuit is constituted of a switching circuit which is capable of distributing an output of the second driving circuit to a plurality of video signal lines.Type: GrantFiled: February 7, 2003Date of Patent: September 12, 2006Assignees: Hitachi, Ltd., Hitachi Device Engineering Co. Ltd.Inventors: Hiroshi Watanabe, Shinji Yasukawa, Hidetoshi Kida, Yoshihisa Ooishi
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Patent number: 7102609Abstract: The present invention realizes a liquid crystal display which mounts driving circuits of low power consumption on a substrate on which a display part is mounted. The driving circuits which supply gray scale voltages to pixels are mounted on a liquid crystal display panel. Display data is transferred between the driving circuits using wiring formed on the liquid crystal display panel, the display data is transferred in the inside of the driving circuits through inner data bus lines, and a data inversion calculation which inverts values of the display data is performed in the inside of the driving circuits for achieving the low power consumption.Type: GrantFiled: April 19, 2002Date of Patent: September 5, 2006Assignees: Hitachi, Ltd., Hitachi Device Engineering Co. Ltd.Inventors: Kazunari Saitou, Shigeru Itou, Yukihide Ode, Youzou Nakayasu, Shinji Yasukawa
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Publication number: 20060092121Abstract: The present invention realizes proper driving circuits in a driving-circuit integral type liquid crystal display device which has an increased screen size. The liquid crystal display device includes a liquid crystal display panel and a driving circuit which supplies video signals to video signal lines formed on the liquid crystal display panel. The driving circuit is comprised of a first driving circuit which is formed in a step similar to a step for forming pixels provided to the liquid crystal display panel and a second driving circuit which is connected to the liquid crystal display panel after formation of the liquid crystal display panel. The first driving circuit is constituted of a switching circuit which is capable of distributing an output of the second driving circuit to a plurality of video signal lines.Type: ApplicationFiled: December 22, 2005Publication date: May 4, 2006Inventors: Hiroshi Watanabe, Shinji Yasukawa, Hidetoshi Kida, Yoshihisa Ooishi
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Patent number: 7031646Abstract: An electrostatic latent image is formed on an image carrier. A first roller is opposed to the image carrier with a gap in between. A second roller is in contact with the first roller such that toner of a one-component type is supplied onto the image carrier by way of the first roller to develop the electrostatic latent image as a visible toner image. A single power source supplies a bias voltage in which an AC voltage is superposed on a DC bias voltage. The bias voltage is supplied to the first roller through a first path and to the second roller through a second path. A resistor is provided on the first path between the first roller and a branching point of the first path and the second path.Type: GrantFiled: September 30, 2004Date of Patent: April 18, 2006Assignee: Seiko Epson CorporationInventors: Shinji Yasukawa, Nobuhiro Miyakawa, Hiroshi Toyama, Takeshi Kobayashi, Shoji Hiruta
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Patent number: 7028377Abstract: A method of producing an ink jet recording head, which includes (1) fixing a passage unit in which a nozzle pate having a nozzle opening, a spacer forming a common ink chamber, and an elastic plate having a thick portion abutting against an end of a piezoelectric vibrating element are stacked, to an opening of a frame having an overhang portion which overhangs to a vicinity of the thick portion, (2) inserting a vibrating element unit into the frame, the vibrating element unit being configured by fixing piezoelectric vibrating elements operating in a longitudinal vibration mode to a fixing substrate, and (3) injecting an adhesive into a groove formed in a region opposing the fixing substrate of the frame.Type: GrantFiled: April 30, 2003Date of Patent: April 18, 2006Assignee: Seiko Epson CorporationInventors: Shinji Yasukawa, Minoru Usui, Takahiro Naka, Tsuyoshi Kitahara, Noriaki Okazawa, Hideaki Sonehara
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Patent number: 7027758Abstract: An image forming apparatus including a latent image carrier and a developing means for charging a toner into a negative polarity by triboelectric charging, wherein the work function of the toner is set to be larger than the work function of the surface of the latent image carrier. When the apparatus includes an intermediate transfer medium, the work function of the toner is set to be larger than the work function of the surface of the intermediate transfer medium. In another embodiment, the work function ?OPC of the surface of the latent image carrier, the work function ?t of the toner, and the work function ?TM of the surface of the intermediate transfer medium are set to satisfy a relationship ?t>?OPC>?TM. These relationships help to reduce fog, and improve transfer efficiency which reduces the consumption of the toner.Type: GrantFiled: October 21, 2004Date of Patent: April 11, 2006Assignee: Seiko Epson CorporationInventors: Nobuhiro Miyakawa, Shinji Yasukawa, Nobumasa Abe, Mikio Furumizu, Kaneo Yoda
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Patent number: 6994942Abstract: A non-magnetic single-component toner 8 of the present invention has toner mother particles 8a, and external additives 12 comprising: two hydrophobic silicas 13, 14 of which particle diameters are different from each other, i.e. a mean primary particle diameter of 7 nm to 12 nm and a mean primary particle diameter of 40 nm to 50 nm, and a hydrophobic rutile/anatase type titanium oxide 15 having a spindle shape of which major axial diameter is in a range from 0.02 nm to 0.10 nm and the ratio of the major axial diameter to the minor axial diameter is set to be 2 to 8, wherein the external additives 12 adhere to the toner mother particles 8a. By the hydrophobic silicas 13, 14 having work function smaller than the work function of the toner mother particles 8a, the negative charging property is imparted to the toner mother particles 8a and the fluidity is also insured.Type: GrantFiled: May 13, 2004Date of Patent: February 7, 2006Assignee: Seiko Epson CorporationInventors: Nobuhiro Miyakawa, Takuya Kadota, Hidehiro Takano, Shinji Yasukawa, Masanao Kunugi
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Publication number: 20050225708Abstract: A display device having a display element is configured such that the extending directions of electrodes are made different from each other among upper, lower, left and right pixels.Type: ApplicationFiled: April 5, 2005Publication date: October 13, 2005Inventors: Ryutaro Oke, Kazunori Ojima, Masaki Tsubokura, Masashi Baba, Yasuhiko Yamagishi, Masahiro Tanaka, Yuuichi Takenaka, Shinji Yasukawa, Kikuo Ono
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Publication number: 20050208404Abstract: The present invention provides a toner having: a toner mother particle; a first external additive including a first inorganic fine particle having a primary particle size distribution of 200 to 750 nm and a work function approximately equivalent to that of the toner mother particle; a second external additive including a second inorganic fine particle having an mean particle size smaller than that of the first inorganic fine particle and a work function smaller than that of the toner particle, a stirring member of a developing device and/or an inner wall of the developing device; and 0.01% to 0.3% by weight of a metal soap having a work function approximately equivalent to that of the toner mother particle.Type: ApplicationFiled: March 21, 2005Publication date: September 22, 2005Inventors: Nobuhiro Miyakawa, Shinji Yasukawa, Hiroyuki Murakami
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Publication number: 20050140630Abstract: The present invention provides a display device which can suppress the increase of a chip size while reducing the number of transistors of a decoder circuit compared to the prior art. Assuming m (m being an integer of 2 or more) as a lower-order bit in accordance with n-bit display data, a drive part includes a gray-scale voltage generating circuit which generates M pieces of gray-scale voltages where the gray scale number with respect to the gray-scale voltages is discontinuous, a decoder circuit which selects two neighboring gray-scale voltages out of M pieces of gray-scale voltages based on data of upper-order (n-m) bits in accordance with n-bit display data, and an output amplifying circuit which generates gray-scale voltages between two gray-scale voltages from two gray-scale voltages selected by the decoder circuit based on the data of lower-order m bits in accordance with n-bit display data and outputs the gray-scale voltages to the video lines.Type: ApplicationFiled: November 22, 2004Publication date: June 30, 2005Inventors: Hidenori Kikuchi, Shinji Yasukawa, Hiroshi Watanabe
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Patent number: 6907215Abstract: A carrier carries developer. A regulation member disposed at a lower portion of the carrier to control an amount of the developer carried by the carrier. A first container disposed below the carrier to contain the developer therein. A guiding path guides developer dropped by the regulation member from the carrier, to the first container.Type: GrantFiled: December 6, 2002Date of Patent: June 14, 2005Assignee: Seiko Epson CorporationInventors: Shinji Yasukawa, Tomoe Aruga, Nobumasa Abe, Yujiro Nomura, Masanao Kunugi