Patents by Inventor Takeshi Sakashita
Takeshi Sakashita 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: 20170170807Abstract: A piezoelectric thin film resonator includes: a substrate; a lower electrode and an upper electrode located on the substrate; a piezoelectric film, at least a part of the piezoelectric film being sandwiched between the upper electrode and the lower electrode, the piezoelectric film including a discontinuous portion in which the piezoelectric film discontinues in at least a part of a region surrounding a center region that includes a center of a resonance region where the upper electrode and the lower electrode face each other across the at least a part of the piezoelectric film.Type: ApplicationFiled: November 21, 2016Publication date: June 15, 2017Applicant: TAIYO YUDEN CO., LTD.Inventors: Tsuyoshi YOKOYAMA, Takeshi SAKASHITA, Shinji TANIGUCHI, Tokihiro NISHIHARA
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Publication number: 20170139353Abstract: An image forming apparatus includes a plurality of image bearers, a plurality of developing devices, a plurality of first transfer devices disposed opposite the plurality of image bearers, a second transfer device, a cleaning device to remove toner remaining on the intermediate transferor after a secondary transfer process, and a processor to control the plurality of developing devices to perform a refresh process to discharge toner from the plurality of developing devices to the plurality of image bearers. Among toner of the colors, toner having a first circularity first reaches the cleaning device and toner having a second circularity higher than the first circularity subsequently reaches the cleaning device in the refresh process.Type: ApplicationFiled: November 1, 2016Publication date: May 18, 2017Inventors: Takeshi Sakashita, Kenji Nakamura, Masanari Fujita, Yuuji Meguro, Takahiro Seki, Naoki Takai, Takuya Akiyama
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Publication number: 20170097589Abstract: An image forming apparatus includes an intermediate transfer body, a plurality of image bearers, a plurality of developing devices, a plurality of primary transfer devices, a secondary transfer device, and a cleaner. The plurality of image bearers is disposed side by side along the intermediate transfer body In a refreshing mode, the plurality of developing devices form toner images on the plurality of image bearers during a non-image-formation period and the cleaner cleans a surface of the intermediate transfer body. In the refreshing mode, a toner image formed on one image bearer of the plurality of image bearers, which differs from a most downstream image bearer of the plurality of image bearers in a direction of conveyance of the intermediate transfer body, reaches the cleaner first of the toner images formed on the plurality of image bearers.Type: ApplicationFiled: September 21, 2016Publication date: April 6, 2017Inventors: Takahiro SEKI, Masanari Fujita, Takeshi Sakashita, Takeshi Yamashita, Naoki Takai, Takuya Akiyama
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Patent number: 9595941Abstract: A filter includes: piezoelectric thin film resonators, each including a substrate, a piezoelectric film located on the substrate, a lower electrode and an upper electrode facing each other across at least a part of the piezoelectric film, and an insertion film inserted in the piezoelectric film, located in at least a part of an outer peripheral region within a resonance region, and not located in a center region of the resonance region, the resonance region being a region where the lower electrode and the upper electrode face each other across the piezoelectric film, wherein at least two piezoelectric thin film resonators out of the piezoelectric thin film resonators have different widths of the insertion films within the resonance regions.Type: GrantFiled: June 9, 2015Date of Patent: March 14, 2017Assignee: TAIYO YUDEN CO., LTD.Inventors: Tokihiro Nishihara, Tsuyoshi Yokoyama, Takeshi Sakashita, Shinji Taniguchi
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Publication number: 20170031310Abstract: A process unit includes a rotatable image bearer, an optical writing head to expose the image bearer within an maximum exposure range in an axial direction of the image bearer, a developer bearer, spacers disposed in axial end portions of the image bearer to determine a position of the optical writing head relative to the image bearer and slidingly contact the image bearer, a cleaner disposed downstream from the developer bearer in an image bearer rotation direction, and a remover to slidingly contact the axial end portion of the image bearer to remove a substance adhering thereto. In the axial direction, inner ends of the spacers are positioned inside a toner layer range of the developer bearer extending beyond a largest sheet width. The remover is disposed downstream from the cleaner and crossing a line extending from the inner end of the spacer perpendicularly to the axial direction.Type: ApplicationFiled: July 29, 2016Publication date: February 2, 2017Applicant: Ricoh Company, Ltd.Inventors: Mitsutoshi KICHISE, Takeshi YAMASHITA, Kazuki MATSUMOTO, Emi KITA, Naoki NAKATAKE, Takeshi SAKASHITA, Takuya AKIYAMA
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Patent number: 9531342Abstract: A piezoelectric thin film resonator includes: a substrate; a piezoelectric film provided on the substrate; a lower electrode and an upper electrode that are opposed to each other to put at least a part of the piezoelectric film therebetween; and an insertion film that is inserted into the piezoelectric film in a resonance region where at least the part of the piezoelectric film is put between the lower electrode and the upper electrode, at least a part of the insertion film corresponding to an outer circumference region in the resonance region being thicker than a part of the insertion film corresponding to a central region in the resonance region.Type: GrantFiled: January 16, 2015Date of Patent: December 27, 2016Assignee: TAIYO YUDEN CO., LTD.Inventors: Shinji Taniguchi, Tokihiro Nishihara, Tsuyoshi Yokoyama, Takeshi Sakashita
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Patent number: 9496848Abstract: A piezoelectric thin-film resonator includes, a substrate, a piezoelectric film provided on the substrate, and a lower electrode and an upper electrode that face each other through the piezoelectric film. The piezoelectric film has an air space that is provided in at least part of an outer circumferential part of a resonance region in which the upper and lower electrodes face each other through the piezoelectric film and is not provided in a central part of the resonance region.Type: GrantFiled: October 29, 2014Date of Patent: November 15, 2016Assignee: TAIYO YUDEN CO., LTD.Inventors: Tsuyoshi Yokoyama, Tokihiro Nishihara, Takeshi Sakashita
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Patent number: 9444429Abstract: A piezoelectric thin-film resonator includes: a substrate; a piezoelectric film having a lower piezoelectric film provided on the substrate and an upper piezoelectric film provided on the lower piezoelectric film; lower and upper electrodes that face each other through at least a part of the piezoelectric film; an interposed film that is interposed between the lower piezoelectric film and the upper piezoelectric film and is located in an outer circumferential part of a resonance region in which the lower and upper electrodes face each other through the piezoelectric film, the interposed film not being provided in a central part of the resonance region; an upper surface of the lower piezoelectric film having a first roughness in a region in which the interposed film is not provided and a second roughness in another region in which the interposed film is provided, the first roughness being smaller than the second roughness.Type: GrantFiled: November 25, 2014Date of Patent: September 13, 2016Assignee: TAIYO YUDEN CO., LTD.Inventors: Takeshi Sakashita, Tokihiro Nishihara, Tsuyoshi Yokoyama
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Patent number: 9356573Abstract: A piezoelectric thin film resonator includes: a piezoelectric film provided on a substrate; a lower electrode and an upper electrode sandwiching at least a part of the piezoelectric film and facing with each other; and an inserted film that is inserted in the piezoelectric film, is provided in an outer circumference region of a resonance region and is not provided in a center region of the resonance region, wherein: an angle between an edge face of the lower electrode and a lower face of the lower electrode in the resonance region is an acute angle; and a width of the inserted film in the resonance region on a side for extracting the upper electrode from the resonance region is larger than another width of the inserted film in the resonance region on a side for extracting the lower electrode from the resonance region.Type: GrantFiled: October 21, 2014Date of Patent: May 31, 2016Assignee: TAIYO YUDEN CO., LTD.Inventors: Tsuyoshi Yokoyama, Tokihiro Nishihara, Takeshi Sakashita
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Publication number: 20160142038Abstract: A piezoelectric thin film resonator includes: a substrate; a piezoelectric film located on the substrate; a lower electrode and an upper electrode facing each other across at least a part of the piezoelectric film; and an insertion film inserted in the piezoelectric film, located in at least a part of an outer peripheral region within a resonance region where the lower electrode and the upper electrode face each other across the piezoelectric film, and not located in a center region of the resonance region, wherein a difference between a total film thickness of the piezoelectric film and the insertion film in a first region, in which the insertion film is inserted, within the resonance region and a film thickness of the piezoelectric film in a second region, in which the insertion film is not inserted, is less than a film thickness of the insertion film.Type: ApplicationFiled: August 12, 2015Publication date: May 19, 2016Applicant: TAIYO YUDEN CO., LTD.Inventors: Shinji TANIGUCHI, Tokihiro NISHIHARA, Tsuyoshi YOKOYAMA, Takeshi SAKASHITA
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Patent number: 9344059Abstract: A piezoelectric thin film resonator includes: a substrate; a piezoelectric film located on the substrate; a lower electrode and an upper electrode facing each other across at least a part of the piezoelectric film; and an insertion film that is inserted into the piezoelectric film, is located in at least a part of an outer periphery region in a resonance region in which the lower electrode and the upper electrode face each other across the piezoelectric film, and is not located in a center region of the resonance region.Type: GrantFiled: January 9, 2014Date of Patent: May 17, 2016Assignee: TAIYO YUDEN CO., LTD.Inventors: Tokihiro Nishihara, Takeshi Sakashita
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Patent number: 9304474Abstract: An image forming apparatus is disclosed, including a movable image bearer bearing an image thereon which is transferred to a recording medium when the image comes into contact with the recording medium; and a twining prevention member which is arranged in the vicinity of the image bearer on the side downstream of a portion of the contact between the recording medium and the image bearer in a moving direction of the image bearer to prevent the recording medium from twining around the image bearer, wherein the twining prevention member includes, in the portion of the contact with the recording medium, a high friction resistance portion which regulates movement of the recording medium.Type: GrantFiled: February 27, 2015Date of Patent: April 5, 2016Assignee: RICOH COMPANY, LTD.Inventors: Takeshi Sakashita, Masanari Fujita, Yuuji Meguro, Naoki Takai, Daisuke Hasebe
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Publication number: 20160028371Abstract: A filter includes: piezoelectric thin film resonators, each including a substrate, a piezoelectric film located on the substrate, a lower electrode and an upper electrode facing each other across at least a part of the piezoelectric film, and an insertion film inserted in the piezoelectric film, located in at least a part of an outer peripheral region within a resonance region, and not located in a center region of the resonance region, the resonance region being a region where the lower electrode and the upper electrode face each other across the piezoelectric film, wherein at least two piezoelectric thin film resonators out of the piezoelectric thin film resonators have different widths of the insertion films within the resonance regions.Type: ApplicationFiled: June 9, 2015Publication date: January 28, 2016Applicant: TAIYO YUDEN CO., LTD.Inventors: Tokihiro NISHIHARA, Tsuyoshi YOKOYAMA, Takeshi SAKASHITA, Shinji TANIGUCHI
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Patent number: 9240769Abstract: A piezoelectric thin film resonator includes a substrate, a lower electrode provided on the substrate, a piezoelectric film provided on the lower electrode, and an upper electrode provided on the piezoelectric film. At least a portion of the upper electrode and that of the lower electrode oppose each other through the piezoelectric film, and at least a portion of the periphery of the upper electrode is reversely tapered.Type: GrantFiled: June 20, 2012Date of Patent: January 19, 2016Assignee: TAIYO YUDEN CO., LTD.Inventors: Takeshi Sakashita, Motoaki Hara, Masafumi Iwaki, Tsuyoshi Yokoyama, Shinji Taniguchi, Tokihiro Nishihara, Masanori Ueda
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Patent number: 9213270Abstract: An image forming apparatus includes: a rotatable transfer member rotatably driven while carrying a toner image thereon; a rotary transfer member to form a transfer nip for transferring the toner image to a recording medium; a housing rotatable about a first rotation center together with the rotary transfer member and switching between a closed state and an open state by the rotation about the first rotation center; a guide member to guide the recording medium conveyed through a conveyance path toward upstream in the direction of rotation of the rotatable transfer member than the transfer nip; a support frame to support the rotatable transfer member; a biasing member to bias the guide member; and a receiving part, disposed on the support frame, configured to contact the guide member biased by the biasing member and position the guide member in the closed state of the housing.Type: GrantFiled: August 28, 2012Date of Patent: December 15, 2015Assignee: RICOH COMPANY, LTD.Inventors: Tetsushi Sakuma, Takeshi Sakashita, Masanari Fujita, Mitsutoshi Kichise, Yuuji Meguro, Masato Tsuji
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Patent number: 9184725Abstract: An acoustic wave device includes: a substrate; a lower electrode formed on the substrate; at least two piezoelectric films formed on the lower electrode; an insulating film located between the at least two piezoelectric films; and an upper electrode formed on the at least two piezoelectric films, wherein an outer periphery of an uppermost piezoelectric film out of the at least two piezoelectric films in a region in which the lower electrode and the upper electrode face each other is positioned further in than an outer periphery of the upper electrode.Type: GrantFiled: July 24, 2012Date of Patent: November 10, 2015Assignee: TAIYO YUDEN CO., LTD.Inventors: Shinji Taniguchi, Tokihiro Nishihara, Masanori Ueda, Tsuyoshi Yokoyama, Takeshi Sakashita
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Patent number: 9164470Abstract: An image forming apparatus, includes: a main body; a cover configured to be provided so as to be capable of being opened and closed with respect to the main body; an attachment unit configured to be provided on the cover; a unit configured to be attached to the attachment unit; a positioning member configured to, on closing of the cover, position the unit with respect to a member attached to the main body or the main body; a guiding member configured to guide the unit to the positioning member; and a protrusion configured to be provided at the guiding member to protrude in an attaching direction of the unit.Type: GrantFiled: September 12, 2013Date of Patent: October 20, 2015Assignee: RICOH COMPANY, LIMITEDInventors: Takeshi Sakashita, Masanari Fujita, Mitsutoshi Kichise, Tetsushi Sakuma
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Publication number: 20150248099Abstract: An image forming apparatus is disclosed, including a movable image bearer bearing an image thereon which is transferred to a recording medium when the image comes into contact with the recording medium; and a twining prevention member which is arranged in the vicinity of the image bearer on the side downstream of a portion of the contact between the recording medium and the image bearer in a moving direction of the image bearer to prevent the recording medium from twining around the image bearer, wherein the twining prevention member includes, in the portion of the contact with the recording medium, a high friction resistance portion which regulates movement of the recording medium.Type: ApplicationFiled: February 27, 2015Publication date: September 3, 2015Inventors: Takeshi SAKASHITA, Masanari FUJITA, Yuuji MEGURO, Naoki TAKAI, Daisuke HASEBE
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Publication number: 20150207490Abstract: A piezoelectric thin film resonator includes: a substrate; a piezoelectric film provided on the substrate; a lower electrode and an upper electrode that are opposed to each other to put at least a part of the piezoelectric film therebetween; and an insertion film that is inserted into the piezoelectric film in a resonance region where at least the part of the piezoelectric film is put between the lower electrode and the upper electrode, at least a part of the insertion film corresponding to an outer circumference region in the resonance region being thicker than a part of the insertion film corresponding to a central region in the resonance region.Type: ApplicationFiled: January 16, 2015Publication date: July 23, 2015Applicant: TAIYO YUDEN CO., LTD.Inventors: Shinji TANIGUCHI, Tokihiro NISHIHARA, Tsuyoshi YOKOYAMA, Takeshi SAKASHITA
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Publication number: 20150171826Abstract: A piezoelectric thin-film resonator includes: a substrate; a piezoelectric film having a lower piezoelectric film provided on the substrate and an upper piezoelectric film provided on the lower piezoelectric film; lower and upper electrodes that face each other through at least a part of the piezoelectric film; an interposed film that is interposed between the lower piezoelectric film and the upper piezoelectric film and is located in an outer circumferential part of a resonance region in which the lower and upper electrodes face each other through the piezoelectric film, the interposed film not being provided in a central part of the resonance region; an upper surface of the lower piezoelectric film having a first roughness in a region in which the interposed film is not provided and a second roughness in another region in which the interposed film is provided, the first roughness being smaller than the second roughness.Type: ApplicationFiled: November 25, 2014Publication date: June 18, 2015Applicant: TAIYO YUDEN CO., LTD.Inventors: Takeshi SAKASHITA, Tokihiro NISHIHARA, Tsuyoshi YOKOYAMA