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).

  • Piezoelectric thin-film resonator and filter using the same
    Patent number: 7567023
    Abstract: 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 so as to have a portion that overlaps the lower electrode across the piezoelectric film. At least a part of an outer end of the piezoelectric film is further in than an outer end of an opposing region in which the upper and lower electrodes overlap each other across the piezoelectric film.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: July 28, 2009
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Masafumi Iwaki, Jun Tsutsumi, Tokihiro Nishihara, Tsuyoshi Yokoyama, Takeshi Sakashita, Shinji Taniguchi, Masanori Ueda, Go Endo
  • Filter having multiple piezoelectric thin-film resonators
    Patent number: 7545077
    Abstract: A filter includes multiple piezoelectric thin-film resonators each having a substrate, a lower electrode formed on the substrate, a piezoelectric film formed on the lower electrode, and an upper electrode provided on the piezoelectric film so that the upper electrode and the lower electrode face each other across the piezoelectric film. The multiple piezoelectric thin-film resonators include a first resonator in which at least a part of an outer curved portion of the piezoelectric film of the first resonator is located further out than an outer curved portion of a region in which the upper electrode and the lower electrode face each other across the piezoelectric film.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: June 9, 2009
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Shinji Taniguchi, Tsuyoshi Yokoyama, Motoaki Hara, Takeshi Sakashita, Jun Tsutsumi, Masafumi Iwaki, Tokihiro Nishihara, Masanori Ueda, Hisanori Ehara
  • TRANSFER DEVICE AND IMAGE FORMING APPARATUS
    Publication number: 20090129831
    Abstract: A neutralizing mechanism is provided on at least one conveying path proximal member installed on a conveying path of a sheet material in a vicinity of a transfer position, and is grounded by using a conducting material. The neutralizing mechanism includes a neutralizing circuit that includes a resistor and a ground switch electrically connected in parallel to each other. The ground switch is turned off at least at a time of applying the transfer bias to prevent a leakage of a transfer current, and turned on for a predetermined time at a time other than the time of applying the transfer bias to earth and remove a static electricity from the conveying path proximal member.
    Type: Application
    Filed: November 7, 2008
    Publication date: May 21, 2009
    Inventors: Takeshi SAKASHITA, Yuuji Meguro, Takeru Muramatsu, Mitsutoshi Kichise, Takuya Etoh
  • Resonator, filter and fabrication of resonator
    Patent number: 7498717
    Abstract: A resonator includes a piezoelectric thin-film provided on a main surface of a substrate, a first electrode film provided on a first surface of the piezoelectric thin-film, a second electrode film provided on a second surface of the piezoelectric thin-film, a frequency adjustment film provided on one of the first and second electrode films, the frequency adjustment film comprising a film laminate including a first adjustment film provided on said one of the first and second electrode films, and a second adjustment film provided on the first adjustment film. The first adjustment film is used for ?f adjustment, and the second adjustment film is used for correcting frequency deviations generated in the filter manufacturing process. Thus, it is possible to accurately control the center frequency of the filter in which the multiple resonators are connected.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: March 3, 2009
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Tsuyoshi Yokoyama, Tokihiro Nishihara, Takeshi Sakashita, Shinji Taniguchi, Masafumi Iwaki, Masanori Ueda, Tsutomu Miyashita
  • Duplexer with filters including film bulk acoustic resonators
    Patent number: 7498899
    Abstract: A duplexer includes: first and second filters including film bulk acoustic resonators (FBARs) arranged in a ladder form; first and second integrated-passive devices (IPDs) provided between a common terminal and the first and second filters; and a substrate on which the first and second filters and the first and second IPDs are mounted. The substrate includes conductive patterns that realize inductances connected between the first and second filters and ground. The first and second IPDs includes inductors connected to the first and second filters.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: March 3, 2009
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Masafumi Iwaki, Tokihiro Nishihara, Jun Tsutsumi, Shinji Taniguchi, Takeshi Sakashita, Tsuyoshi Yokoyama, Masanori Ueda, Tsutomu Miyashita
  • OPTICAL SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20090028203
    Abstract: A method for manufacturing a semiconductor device having a compound semiconductor layer that is provided on a substrate and includes a cladding layer of a first conductivity type, an activation layer, a cladding layer of a second conductivity type that is the opposite of the first conductivity type, includes the steps of: forming a diffusion source layer on the compound semiconductor layer; forming a first diffusion region in the compound semiconductor layer by carrying out a first heat treatment, so that the first diffusion region includes a light emitting facet for emitting light from the activation layer; removing the diffusion source layer; forming a first SiN film having a refractive index of 1.9 or higher on the compound semiconductor layer; and turning the first diffusion region into the second diffusion region by carrying out a second heat treatment.
    Type: Application
    Filed: July 28, 2008
    Publication date: January 29, 2009
    Applicant: EUDYNA DEVICES INC.
    Inventors: Takeshi SAKASHITA, Masanori SAITO
  • Piezoelectric thin-film resonator and filter
    Patent number: 7482738
    Abstract: A piezoelectric thin-film resonator includes a lower electrode formed on a substrate to define a rounded dome-shaped cavity between the lower electrode and the substrate, a piezoelectric film provided on the lower electrode, and an upper electrode provided on the piezoelectric film. A membrane region is an overlapping region of the lower electrode and the upper electrode interposing the piezoelectric film and a projected area of the cavity onto the substrate includes the membrane region.
    Type: Grant
    Filed: October 26, 2006
    Date of Patent: January 27, 2009
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Shinji Taniguchi, Tsuyoshi Yokoyama, Motoaki Hara, Takeshi Sakashita, Jun Tsutsumi, Masafumi Iwaki, Tokihiro Nishihara, Masanori Ueda
  • BELT UNIT AND IMAGE FORMING APPARATUS
    Publication number: 20090011882
    Abstract: At least one of a plurality of rollers supporting an endless belt includes a flange arranged on an end portion of the roller. The flange includes a cylindrical portion that is inserted into an opening portion of the roller at its end. Outer circumference of the cylindrical portion makes contact with inner circumference of the roller, and inner circumference of the flange makes contact with a rotation shaft of the roller. The inner edge of a surface where the flange is in contact with the rotation shaft is located on the inner side of the outer edge of a surface where the cylindrical portion is in contact with the roller in the longitudinal direction of the rotation shaft.
    Type: Application
    Filed: June 19, 2008
    Publication date: January 8, 2009
    Inventors: Mitsutoshi KICHISE, Tomofumi Inoue, Takeshi Sakashita, Takeru Muramatsu, Yuuji Meguro
  • TRANSFER BELT DEVICE, METHOD OF ASSEMBLING THE SAME, AND IMAGE FORMING APPARATUS
    Publication number: 20080317521
    Abstract: Rollers including a tension roller are arranged in parallel. A pair of supporting members supports both ends of the rollers. A transfer belt is supported by the rollers. A biasing member applies a tension to the transfer belt by biasing the tension roller in a predetermined direction. The tension roller is movably supported in a straight-line direction. The biasing member is arranged in an area surrounded by the supporting members and the transfer belt in a direction of traversing from one supporting member to other supporting member.
    Type: Application
    Filed: May 22, 2008
    Publication date: December 25, 2008
    Inventors: Tomofumi Inoue, Takeshi Sakashita, Mitsutoshi Kichise, Yuuji Meguro, Takeru Muramatsu
  • Piezoelectric thin-film resonator and filter and fabricating method
    Patent number: 7432631
    Abstract: A piezoelectric thin-film resonator includes a device substrate and a laminated body provided on the device substrate and composed of a lower electrode, an upper electrode and a piezoelectric film sandwiched between the lower and upper electrodes. The laminated body has a membrane portion in which the upper and lower electrodes overlap with each other through the piezoelectric film, and a gap has a dome shape being formed between the device substrate and the lower electrode and located below the membrane portion.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: October 7, 2008
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Shinji Taniguchi, Tokihiro Nishihara, Takeshi Sakashita, Tsuyoshi Yokoyama, Masafumi Iwaki, Masanori Ueda, Tsutomu Miyashita
  • Powder container and image forming apparatus
    Publication number: 20080193167
    Abstract: A powder conveying unit conveys powder input from a powder inlet of a powder containing chamber into the powder containing chamber. A powder detecting unit detects a full state of the powder conveyed by the powder conveying unit in the powder containing chamber. A sensor chamber is provided outside the powder containing chamber connected with each other. The powder detecting unit is provided in the sensor chamber, a bottom surface of the sensor chamber is at higher level than a bottom surface of the powder containing chamber, and the bottom surface of the sensor chamber is inclined downward toward the powder containing chamber.
    Type: Application
    Filed: January 14, 2008
    Publication date: August 14, 2008
    Inventors: Tomofumi Inoue, Kohji Hatayama, Takeshi Sakashita, Mitsutoshi Kichise, Yuuji Meguro, Takeru Muramatsu
  • Image forming apparatus and powder housing unit
    Publication number: 20080187365
    Abstract: A powder housing unit includes a plate-shaped agitating unit that is horizontally arranged inside of a casing to accommodate a powder, a rotating shaft that causes the agitating unit to slide back and forth, and a powder conveying unit that conveys the powder in a horizontal direction during the sliding. The rotating shaft is supported by a shaft supporting unit in a rotatable manner such that a space is formed between the rotating shaft and the shaft supporting unit.
    Type: Application
    Filed: January 30, 2008
    Publication date: August 7, 2008
    Inventors: Takeshi Sakashita, Tomofumi Inoue, Takeru Muramatsu, Kohji Hatayama, Mitsutoshi Kichise, Yuuji Meguro
  • Transfer device, image forming apparatus, and waste toner container
    Publication number: 20080138133
    Abstract: A transfer device includes a cleaning device, a waste toner bottle, a connecting unit, and a regulating unit. The cleaning device removes waste toner remaining on an intermediate transfer belt. The waste toner bottle has an intake opening for collecting the waste toner therein. The connecting unit conveys the waste toner from the cleaning device to the waste toner bottle, and has a discharge opening that is configured to engage the intake opening to discharge the waste toner into the waste toner bottle through the intake opening. The regulating unit regulates the position of the waste toner bottle in a direction perpendicular to the moving direction of the waste toner bottle before the discharge opening comes in contact with the intake opening.
    Type: Application
    Filed: December 7, 2007
    Publication date: June 12, 2008
    Inventors: Kohji Hatayama, Tomofumi Inoue, Takeshi Sakashita, Mitsutoshi Kichise, Yuuji Meguro, Takeru Muramatsu
  • Piezoelectric thin-film resonator and filter having the same
    Patent number: 7368859
    Abstract: A piezoelectric thin-film resonator includes a lower electrode provided on a substrate, a piezoelectric thin film provided on the lower electrode, and an upper electrode provided on the piezoelectric thin film. A membrane region is defined by a region where the upper electrode and the lower electrode overlap each other to sandwich the piezoelectric thin film therebetween and has an elliptical shape, and the lower electrode is also provided at an outer side of the membrane region in a region in which neither an extraction electrode of the upper electrode nor an extraction electrode of the lower electrode is provided.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: May 6, 2008
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Tsuyoshi Yokoyama, Tokihiro Nishihara, Shinji Taniguchi, Takeshi Sakashita, Jun Tsutsumi, Masafumi Iwaki, Masanori Ueda
  • Piezoelectric thin-film resonator and filter using the same
    Patent number: 7345402
    Abstract: A piezoelectric thin-film resonator includes a film laminate formed on a device substrate, the film laminate including a lower electrode, a piezoelectric film provided on the device substrate and the lower electrode, and an upper electrode provided on the piezoelectric film. At least one of the upper and lower electrodes has an electrode leading portion that extends from an membrane in which the upper electrode overlaps with the lower electrode through the piezoelectric film and has a width narrower than that of the membrane.
    Type: Grant
    Filed: January 6, 2006
    Date of Patent: March 18, 2008
    Assignees: Fujitsu-Media Devices Limited, Fujitsu Limited
    Inventors: Shinji Taniguchi, Tsuyoshi Yokoyama, Takeshi Sakashita, Jun Tsutsumi, Masafumi Iwaki, Tokihiro Nishihara, Masanori Ueda
  • POWER GUIDING DEVICE AND IMAGE FORMING APPARATUS HAVING POWER GUIDING DEVICE
    Publication number: 20080050158
    Abstract: A shutter is rotatably supported by a first powder guiding member. When the first powder guiding member and a second powder guiding member occupy powder guiding positions, the shutter takes an open position. At this moment, a rear end of an upper surface of an open/close plate of the shutter is positioned on an inner side of an upper opening of the second powder guiding member.
    Type: Application
    Filed: August 1, 2007
    Publication date: February 28, 2008
    Inventors: Kohji Hatayama, Tomofumi Inoue, Takeshi Sakashita, Yuuji Meguro, Takeru Muramatsu
  • IMAGE FORMING APPARATUS
    Publication number: 20080028967
    Abstract: An intermediate transfer unit includes a stand member that is integral with an intermediate-transfer-unit body of the intermediate transfer unit. The stand member stretches below the intermediate-transfer-unit body from a trailing edge to a leading edge of the intermediate-transfer-unit in an attachment direction of the intermediate transfer unit.
    Type: Application
    Filed: May 11, 2007
    Publication date: February 7, 2008
    Inventors: Takeshi SAKASHITA, Tomofumi Inoue, Yuuji Meguro, Takeru Muramatsu, Kohji Hatayama
  • Film bulk acoustic resonator and method of producing the same
    Patent number: 7323953
    Abstract: A film bulk acoustic resonator includes: a piezoelectric thin film that is formed on a principal surface of a substrate; and a lower electrode and an upper electrode that are arranged to sandwich the piezoelectric thin film. In this film bulk acoustic resonator, the piezoelectric thin film is made of aluminum nitride, and at least one of the lower electrode and the upper electrode contains a ruthenium or ruthenium-alloy layer.
    Type: Grant
    Filed: August 26, 2004
    Date of Patent: January 29, 2008
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Tsuyoshi Yokoyama, Takeshi Sakashita, Tokihiro Nishihara, Tsutomu Miyashita, Yoshio Satoh
  • TRANSFER DEVICE AND IMAGE FORMING APPARATUS
    Publication number: 20080003022
    Abstract: A transfer device transfers an image formed on each of image-carrier rotating members onto a transfer belt by applying a bias voltage to the image-carrier rotating members. A rotation axis of one of image-carrier rotating member located the most upstream is positioned closer to the transfer belt than those of the other image-carrier rotating members. Each of the bias-applying rotating members is displaced downstream of the corresponding image-carrier rotating member, and a line on which a rotation axis of the bias-applying rotating member and that of the corresponding image-carrier rotating member fall is orthogonal to a moving direction of the transfer belt.
    Type: Application
    Filed: June 12, 2007
    Publication date: January 3, 2008
    Inventors: Takeshi SAKASHITA, Kohji Hatayama, Tomofumi Inoue
  • Filter having multiple piezoelectric thin-film resonators
    Publication number: 20070279154
    Abstract: A filter includes multiple piezoelectric thin-film resonators each having a substrate, a lower electrode formed on the substrate, a piezoelectric film formed on the lower electrode, and an upper electrode provided on the piezoelectric film so that the upper electrode and the lower electrode face each other across the piezoelectric film. The multiple piezoelectric thin-film resonators include a first resonator in which at least a part of an outer curved portion of the piezoelectric film of the first resonator is located further out than an outer curved portion of a region in which the upper electrode and the lower electrode face each other across the piezoelectric film.
    Type: Application
    Filed: May 30, 2007
    Publication date: December 6, 2007
    Inventors: Shinji Taniguchi, Tsuyoshi Yokoyama, Motoaki Hara, Takeshi Sakashita, Jun Tsutsumi, Masafumi Iwaki, Tokihiro Nishihara, Masanori Ueda, Hisanori Ehara