Patents by Inventor Masafumi Iwaki

Masafumi Iwaki 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).

  • Publication number: 20100148888
    Abstract: The filter includes a series arm piezoelectric thin film resonator placed in the series arm and a parallel arm piezoelectric thin film resonator placed in the parallel arm. Each of the series arm piezoelectric thin film resonator and the parallel arm piezoelectric thin film resonator includes a substrate (21), a lower electrode (22) placed on the substrate (21), a piezoelectric film (23) placed on the lower electrode (22) and a upper electrode (24) placed on the piezoelectric film (23). The ratio of the major axis length A to the minor axis length B of the resonant portion (29) in the series arm piezoelectric thin film resonator is larger than that in the parallel arm piezoelectric thin film resonator.
    Type: Application
    Filed: February 24, 2010
    Publication date: June 17, 2010
    Applicants: FUJITSU LIMITED, FUJITSU MEDIA DEVICES LIMITED
    Inventors: Motoaki HARA, Tokihiro NISHIHARA, Shinji TANIGUCHI, Takeshi SAKASHITA, Tsuyoshi YOKOYAMA, Masafumi IWAKI, Masanori UEDA, Yasuyuki SAITOU
  • Patent number: 7737806
    Abstract: A piezoelectric thin-film resonator includes: a lower electrode that is formed on a substrate; a piezoelectric film that is formed on the substrate and the lower electrode; an upper electrode that is formed on the piezoelectric film, with a portion of the piezoelectric film being interposed between the lower electrode and the upper electrode facing each other; and an additional film that is formed on the substrate on at least a part of the outer periphery of the lower electrode at the portion at which the lower electrode and the upper electrode face each other, with the additional film being laid along the lower electrode.
    Type: Grant
    Filed: May 16, 2008
    Date of Patent: June 15, 2010
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Shinji Taniguchi, Tokihiro Nishihara, Tsuyoshi Yokoyama, Masafumi Iwaki, Motoaki Hara, Go Endo, Yasuyuki Saitou, Masanori Ueda
  • Publication number: 20100141353
    Abstract: There is provided a piezoelectric thin film resonator that decreases only transverse mode waves selectively while maintaining resonance characteristics due to original thickness longitudinal vibration. The piezoelectric thin film resonator includes: a piezoelectric film (14); a first electrode (15a) formed on a first principal surface of the piezoelectric film (14); and a second electrode (13) formed on a second principal surface of the piezoelectric film (14) opposite to the first principal surface. The resonator has a resonance region (20) where the first electrode (15a) and the second electrode (13) are opposed to each other. An electrically discontinuous portion (18a) that is insulated from the first electrode (15a) is provided on the first principal surface of the piezoelectric film (14) in the resonance region (20), and the electrically discontinuous portion (18a) is surrounded by the first electrode (15a) on the first principal surface.
    Type: Application
    Filed: February 17, 2010
    Publication date: June 10, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Masafumi Iwaki, Tokihiro Nishihara, Masanori Ueda
  • Publication number: 20100117762
    Abstract: A resonator includes a substrate, a lower electrode, a piezoelectric film provided on the lower electrode, and an upper electrode provided on the piezoelectric film. The lower electrode includes a first film provided on the substrate, and a second film that is provided on the first film and has a specific gravity greater than that of the first film. The piezoelectric film is provided on the second film. The upper electrode includes a third film provided on the piezoelectric film, and a fourth film provided on the third film, the third film having a specific gravity greater than that of the fourth film. The third film is thicker than the second film.
    Type: Application
    Filed: August 25, 2009
    Publication date: May 13, 2010
    Applicants: FUJITSU LIMITED, FUJITSU MEDIA DEVICES LIMITED
    Inventors: Shinji Taniguchi, Tokihiro Nishihara, Masafumi Iwaki, Masanori Ueda, Go Endo, Tsuyoshi Yokoyama, Takeshi Sakashita, Motoaki Hara
  • Publication number: 20100110940
    Abstract: An acoustic wave filter having excellent steepness is provided without adding any exterior components or any new manufacturing steps. A plurality of filters (10-1) each having a first resonator (2a-1) placed in a serial arm and having a resonance frequency frs and an anti-resonance frequency fas, and a second resonator (4a-1) placed in a parallel arm and having a resonator frp and an anti-resonance frequency fap are provided on a same substrate, where the resonance frequency frs of the first resonator is higher than the resonance frequency frp of the second resonator; the anti-resonance frequency fas of the first resonator is higher than the anti-resonance frequency fap of the second resonator; and the filters (10-1) are connected in multiple stages. At least one of the filters (10-1) connected in multiple stages has a third resonator (6-1) having a resonance frequency frp and an anti-resonance frequency fap.
    Type: Application
    Filed: January 8, 2010
    Publication date: May 6, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Motoaki HARA, Tokihiro Nishihara, Shinji Taniguchi, Takeshi Sakashita, Tsuyoshi Yokoyama, Masafumi Iwaki, Masanori Ueda
  • Publication number: 20100096358
    Abstract: A ladder filter includes a series resonator having a first film laminate in which an upper electrode and a lower electrode face each other across a piezoelectric film, and a first film provided on the first film laminate, and a parallel resonator having a second film laminate having a structure similar to that of the first film laminate, a second film provided on the second film laminate, and another first film identical to the first film.
    Type: Application
    Filed: December 28, 2009
    Publication date: April 22, 2010
    Applicants: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Shinji TANIGUCHI, Tokihiro Nishihara, Tsuyoshi Yokoyama, Masafumi Iwaki, Go Endo, Yasuyuki Saitou, Hisanori Ehara, Masanori Ueda
  • Publication number: 20100060384
    Abstract: A filter has a plurality of piezoelectric thin film resonators formed by sandwiching a piezoelectric film with a lower electrode disposed on a substrate and an upper electrode. Each of the piezoelectric thin film resonators has an electrode region formed with the upper electrode and the lower electrode overlapping each other, whose outline includes a curve. Among the plural piezoelectric thin film resonators, the piezoelectric thin film resonators in the opposing electrode regions of the adjacent piezoelectric thin film resonators are shaped to have outlines complementary to each other. With the filter, influences caused by transverse mode undesired wave of the piezoelectric thin film resonators can be suppressed. Therefore, miniaturization can be achieved without sacrificing the mechanical strength of electrodes having hollow structures.
    Type: Application
    Filed: June 30, 2009
    Publication date: March 11, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Shinji TANIGUCHI, Tokihiro Nishihara, Tsuyoshi Yokoyama, Masafumi Iwaki, Motoaki Hara, Takeshi Sakashita, Masanori Ueda
  • Publication number: 20100060385
    Abstract: A piezoelectric thin film resonator includes a substrate, a lower electrode formed on the substrate, a piezoelectric film formed on the substrate and the lower electrode, and an upper electrode formed on the piezoelectric film and opposing the lower electrode, an upper electrode formed on the piezoelectric film. The upper electrode has a main portion and an extended portion connected to the main portion, the main portion opposing the lower electrode and an opening disposed between the substrate and the lower electrode, the extended portion having a portion which opposes the opening and the substrate.
    Type: Application
    Filed: March 4, 2009
    Publication date: March 11, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Shinji TANIGUCHI, Tokihiro Nishihara, Tsuyoshi Yokoyama, Masafumi Iwaki, Motoaki Hara, Masanori Ueda
  • Publication number: 20100033063
    Abstract: A piezoelectric thin film resonator includes a substrate, a lower electrode formed on the substrate, a piezoelectric film formed on the lower electrode, and an upper electrode formed on the piezoelectric film, the lower electrode and the upper electrode opposing each other through the piezoelectric film to form an opposing region, the opposing region including a space at a boundary of the opposing region. The space extends from an innerside to an outer side of the opposing region and is formed in or on the piezoelectric film.
    Type: Application
    Filed: August 4, 2009
    Publication date: February 11, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Tokihiro Nishihara, Motoaki Hara, Shinji Taniguchi, Takeshi Sakashita, Tsuyoshi Yokoyama, Masafumi Iwaki, Masanori Ueda
  • Publication number: 20100026414
    Abstract: A filter includes: a first filter unit includes: a series resonators connected in series to each other between a first input terminal and a first output terminal; a parallel resonators each having one end connected to one terminal of each of the series resonators; and a common inductance having one end connected to the other ends of the parallel resonators and the other end connected to a ground terminal, and a second filter unit includes: a series resonators connected in series to each other between a second input terminal and a second output terminal; a parallel resonators each having one end connected to one terminal of each of the series resonators; and a common inductance having one end connected to the other ends of the parallel resonators and the other end connected to the ground terminal.
    Type: Application
    Filed: July 30, 2009
    Publication date: February 4, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Masafumi IWAKI, Tokihiro NISHIHARA, Shinji TANIGUCHI, Takeshi SAKASHITA, Tsuyoshi YOKOYAMA, Motoaki HARA, Masanori UEDA
  • Publication number: 20100019866
    Abstract: An acoustic wave device includes a substrate and a plurality of piezoelectric thin film resonators formed over the substrate. Each of the plurality of the piezoelectric thin film resonators includes lower electrode provided on the substrate, a piezoelectric film provided on the lower electrode, and an upper electrode provided on the piezoelectric film and opposed to the lower electrode through the piezoelectric film. Each of the piezoelectric thin film resonators is partly supported by the substrate and extends above the substrate to form a cavity between the substrate and each lower electrodes. The cavity continuously extending under the plurality of the piezoelectric thin film resonators.
    Type: Application
    Filed: July 15, 2009
    Publication date: January 28, 2010
    Applicant: FUJITSU LIMITED
    Inventors: Motoaki HARA, Tokihiro Nishihara, Shinji Taniguchi, Takeshi Sakashita, Tsuyoshi Yokoyama, Masafumi Iwaki, Masanori Ueda
  • Patent number: 7579761
    Abstract: A piezoelectric thin-film resonator includes: a lower electrode that is formed on a substrate; a piezoelectric film that is formed on the lower electrode; and an upper electrode that is formed on the piezoelectric film. In the piezoelectric thin-film resonator, the upper electrode has a greater film thickness than the lower electrode.
    Type: Grant
    Filed: May 9, 2006
    Date of Patent: August 25, 2009
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Tokihiro Nishihara, Tsuyoshi Yokoyama, Shinji Taniguchi, Takeshi Sakashita, Jun Tsutsumi, Masafumi Iwaki, Masanori Ueda
  • Publication number: 20090206706
    Abstract: There is provided a piezoelectric thin-film resonator including a substrate, a lower electrode disposed on the substrate, a piezoelectric film disposed on the lower electrode, an upper electrode disposed on the piezoelectric film in such a manner that a portion of the upper electrode is opposed to the lower electrode, and a mass element disposed on the upper electrode in a portion of an edge of the region of the upper electrode in which the upper electrode and the lower electrode are opposed to each other.
    Type: Application
    Filed: February 10, 2009
    Publication date: August 20, 2009
    Applicant: FUJITSU LIMITED
    Inventors: Masafumi Iwaki, Tokihiro Nishihara, Masanori Ueda
  • Patent number: 7573354
    Abstract: A duplexer includes an antenna terminal, a first filter connected to the antenna terminal, and a second filter connected to the antenna terminal. At least one of the first filter and the second filter is a ladder type filter in which a parallel resonator and multiple series resonators are included, one or more first inductors are respectively connected in parallel with one or more series resonators out of the multiple series resonators, and one of the one or more first inductors is connected in parallel with one of the multiple series resonators that is arranged closest to the antenna terminal.
    Type: Grant
    Filed: August 8, 2006
    Date of Patent: August 11, 2009
    Assignees: Fujitsu Media Devices Limited, Fujitsu Limited
    Inventors: Tokihiro Nishihara, Shogo Inoue, Takashi Matsuda, Masanori Ueda, Masafumi Iwaki, Shinji Taniguchi, Go Endo
  • 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
  • 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
  • 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
  • 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
  • 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
  • Publication number: 20080284540
    Abstract: An antenna duplexer is provided, which can be built with a smaller size and lower height than ever without compromising out-of-band attenuation characteristic and isolation characteristic between a transmit terminal and a receive terminal. The antenna duplexer includes a transmit filter provided between an antenna terminal and the transmit terminal, and a receive filter provided between the antenna terminal and the receive terminal. The filters are enclosed by a package, in which a ground pattern for the receive filter is separated from other ground patterns.
    Type: Application
    Filed: April 21, 2008
    Publication date: November 20, 2008
    Applicants: FUJITSU LIMITED, FUJITSU MEDIA DEVICES LIMITED
    Inventors: Tokihiro NISHIHARA, Masafumi Iwaki, Shinji Taniguchi, Masanori Ueda, Go Endo, Koichi Hatano