Eiji Masui

Title: Eiji Masui: Innovator in Acoustic Resonators

Introduction

Eiji Masui is a prominent inventor based in Ube, Japan, recognized for his contributions to the field of piezoelectric devices. With a total of two patents, he has significantly impacted the technology surrounding acoustic resonators and their applications in various innovative products.

Latest Patents

Masui's latest work includes two notable patents:

1. **Aluminum Nitride Thin Film, Composite Film Containing the Same and Piezoelectric Thin Film Resonator Using the Same**

This invention features a piezoelectric thin film resonator that includes a substrate and a specialized piezoelectric layered structure. The structure consists of a lower electrode, a piezoelectric aluminum nitride thin film with c-axis orientation, and an upper electrode, all formed on the substrate. The lower electrode is made from a metal thin film, which incorporates a layer with ruthenium as a major component, achieving a full-width half maximum (FWHM) of a rocking curve of the (0002) diffraction peak of 3.0° or less. The piezoelectric aluminum nitride thin film demonstrates a significant level of performance with an FWHM of the (0002) diffraction peak of 2.0° or less.

2. **Filter Using Film Bulk Acoustic Resonator and Transmission/Reception Switch**

This invention presents a series of elements that combine film bulk acoustic resonators and grounded shunt elements. These elements are interconnected between transmission and reception ports with an antenna port, thus forming an effective transmission band filter and reception band filter. Additionally, a film bulk acoustic resonator for adjustment is included to ensure optimal performance across frequency pass bands. The overall design enables a duplexer that is compact, cost-effective, and possesses excellent power handling capabilities.

Career Highlights

Eiji Masui works at Ube Industries, Inc., where he has contributed significantly to various research and development projects. His focus on piezoelectric materials and resonators underscores his commitment to advancing modern technology in this field.

Collaborations

Throughout his career, Masui has collaborated with other talented professionals, including Keigo Nagao and Tetsuo Yamada. Their combined expertise enhances the innovative potential of the projects at Ube Industries.

Conclusion

Eiji Masui is a noteworthy inventor whose work on piezoelectric thin film resonators and related technologies is paving the way for future innovations in the field. With his ongoing contributions, he continues to inspire and lead advancements in acoustic resonators, benefiting various technological applications globally.