Company Filing History:
Years Active: 1981-1986
Title: Sakichi Ashida: Innovator in Piezoelectric Technology
Introduction
Sakichi Ashida is a notable inventor based in Fuchu, Japan. He has made significant contributions to the field of piezoelectric technology, holding a total of 5 patents. His work focuses on developing innovative methods and apparatuses that enhance the functionality of surface acoustic wave (SAW) devices.
Latest Patents
One of Ashida's latest patents is an "Apparatus for and method of determining properties of saw substrates." This invention provides a non-destructive method for determining the properties of a SAW substrate. It involves the use of first and second interdigital transducers formed on a common piezoelectric substrate, with a blocking member to prevent acoustic wave signals from transferring between the transducers. The design includes spacers that support the SAW substrate above the common substrate, ensuring effective co-directional mode coupling during operation. An electric signal is applied to the first transducer, allowing the acoustic signal to propagate along the surface of the SAW substrate and be measured by the second transducer.
Another significant patent is the "Three electrode piezoelectric ceramic resonator." This invention consists of a piezoelectric ceramic plate polarized in the thickness direction, with two split electrodes on one surface and a full electrode on the opposite surface. When an operating voltage is applied to the split electrodes, the ceramic plate resonates in a thickness dilatational mode, creating a phase difference of 180 degrees.
Career Highlights
Sakichi Ashida is associated with Hitachi, Ltd., a leading company in technology and innovation. His work at Hitachi has allowed him to explore and develop advanced piezoelectric devices that have applications in various industries.
Collaborations
Throughout his career, Ashida has collaborated with notable colleagues, including Yukio Ito and Hiroshi Takeuchi. These collaborations have contributed to the advancement of piezoelectric technology and the development of innovative solutions.
Conclusion
Sakichi Ashida's contributions to piezoelectric technology through his patents and work at Hitachi, Ltd. highlight his role as an influential inventor. His innovative approaches continue to impact the field and inspire future advancements in technology.