Patents by Inventor Hirotada Wachi

Hirotada Wachi 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).

  • Surface acoustic wave device
    Patent number: 7462973
    Abstract: A surface acoustic wave device includes a piezoelectric substrate, at least one interdigital transducer (IDT) provided on the piezoelectric substrate, and a shield electrode provided on the piezoelectric substrate. The IDT has a first pattern on an edge that faces the shield electrode. The shield electrode has a second pattern on an edge so as to be evenly spaced apart from the first pattern.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: December 9, 2008
    Assignee: Fujitsu Media Devices Limited
    Inventors: Hirotada Wachi, Toshifumi Tanaka, Tohru Takezaki, Satoshi Ichikawa, Tsuyoshi Oura, Koichi Wada, Satoshi Orito
  • Surface acoustic wave device
    Patent number: 7372347
    Abstract: A surface acoustic wave (SAW) device includes a piezoelectric substrate, a first and a second interdigital transducers (IDT) provided thereon. The second IDT has a side that is substantially aligned with a corresponding side of the first IDT, and another side of the second IDT is arranged so that the second IDT may adjust a leaked wave caused resulting from by a power-flow angle of the piezoelectric substrate.
    Type: Grant
    Filed: November 16, 2004
    Date of Patent: May 13, 2008
    Assignee: Fujitsu Media Devices Limited
    Inventors: Satoshi Orito, Tsuyoshi Oura, Toru Takezaki, Satoshi Ichikawa, Hirotada Wachi, Toshifumi Tanaka, Koichi Wada
  • Surface acoustic device
    Patent number: 7221074
    Abstract: A surface acoustic wave device includes a piezoelectric substrate, a first and a second interdigital transducers (IDTs) provided on the piezoelectric substrate. The first IDT includes multiple tracks having different frequency characteristics that are connected in parallel. The second IDT includes a normalized electrode pattern. The frequency characteristic of the multiple tracks is asymmetric to a center frequency of the SAW filter, substantially flat in a passband when those of the multiple tracks are overlapped, or complementary in the passband. Thus, it is possible to provide the surface acoustic wave device having a high damping property.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: May 22, 2007
    Assignee: Fujitsu Media Devices Limited
    Inventors: Satoshi Orito, Toru Takezaki, Satoshi Ichikawa, Hirotada Wachi, Tsuyoshi Oura, Toshifumi Tanaka, Koichi Wada
  • Filter using piezoelectric material
    Patent number: 7154360
    Abstract: A filter includes a piezoelectric substrate, and interdigital transducers (IDTs) that are formed on the piezoelectric substrate. At least one of the IDTs has a main electrode finger pattern that is weighted. The IDT having the main electrode finger pattern also has a sub electrode finger pattern that is connected in parallel to the main electrode finger pattern, and generates a surface acoustic wave that cancels a surface acoustic wave caused by leakage electric fields generated in the main electrode finger pattern.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: December 26, 2006
    Assignee: Fujitsu Media Devices Limited
    Inventors: Koichi Wada, Satoshi Ichikawa, Hirotada Wachi, Tohru Takezaki, Tsuyoshi Oura, Toshifumi Tanaka, Satoshi Orito
  • Surface acoustic wave device
    Publication number: 20050168302
    Abstract: A surface acoustic wave (SAW) device includes a piezoelectric substrate, a first and a second interdigital transducers (IDT) provided thereon. The second IDT has a side that is substantially aligned with a corresponding side of the first IDT, and another side of the second IDT is arranged so that the second IDT may adjust a leaked wave caused resulting from by a power-flow angle of the piezoelectric substrate.
    Type: Application
    Filed: November 16, 2004
    Publication date: August 4, 2005
    Inventors: Satoshi Orito, Tsuyoshi Oura, Toru Takezaki, Satoshi Ichikawa, Hirotada Wachi, Toshifumi Tanaka, Koichi Wada
  • Surface acoustic device
    Publication number: 20050121998
    Abstract: A surface acoustic wave device includes a piezoelectric substrate, a first and a second interdigital transducers (IDTs) provided on the piezoelectric substrate. The first IDT includes multiple tracks having different frequency characteristics that are connected in parallel. The second IDT includes a normalized electrode pattern. The frequency characteristic of the multiple tracks is asymmetric to a center frequency of the SAW filter, substantially flat in a passband when those of the multiple tracks are overlapped, or complementary in the passband. Thus, it is possible to provide the surface acoustic wave device having a high damping property.
    Type: Application
    Filed: November 17, 2004
    Publication date: June 9, 2005
    Inventors: Satoshi Orito, Toru Takezaki, Satoshi Ichikawa, Hirotada Wachi, Tsuyoshi Oura, Toshifumi Tanaka, Koichi Wada
  • Surface acoustic wave device
    Publication number: 20050093395
    Abstract: A surface acoustic wave device includes a piezoelectric substrate, at least one interdigital transducer (IDT) provided on the piezoelectric substrate, and a shield electrode provided on the piezoelectric substrate. The IDT has a first pattern on an edge that faces the shield electrode. The shield electrode has a second pattern on an edge so as to be evenly spaced apart from the first pattern.
    Type: Application
    Filed: October 1, 2004
    Publication date: May 5, 2005
    Inventors: Hirotada Wachi, Toshifumi Tanaka, Tohru Takezaki, Satoshi Ichikawa, Tsuyoshi Oura, Koichi Wada, Satoshi Orito
  • Filter using piezoelectric material
    Publication number: 20050093660
    Abstract: A filter includes a piezoelectric substrate, and interdigital transducers (IDTs) that are formed on the piezoelectric substrate. At least one of the IDTs has a main electrode finger pattern that is weighted. The IDT having the main electrode finger pattern also has a sub electrode finger pattern that is connected in parallel to the main electrode finger pattern, and generates a surface acoustic wave that cancels a surface acoustic wave caused by leakage electric fields generated in the main electrode finger pattern.
    Type: Application
    Filed: September 28, 2004
    Publication date: May 5, 2005
    Inventors: Koichi Wada, Satoshi Ichikawa, Hirotada Wachi, Tohru Takezaki, Tsuyoshi Oura, Toshifumi Tanaka, Satoshi Orito