Yasuichi Mitsushima

Title: Yasuichi Mitsushima: Innovator in Microphone and Semiconductor Technologies

Introduction

Yasuichi Mitsushima is a notable inventor based in Hashima, Japan. He has made significant contributions to the fields of microphone technology and semiconductor devices. With a total of 3 patents to his name, Mitsushima's work showcases his innovative spirit and technical expertise.

Latest Patents

One of Mitsushima's latest patents is a microphone that identifies the direction along which acoustic waves propagate using a single diaphragm. This microphone is designed to have superior durability and includes a circular diaphragm supported at its center. When the diaphragm receives acoustic waves, various positions around the center vibrate with a phase that depends on the direction of the incoming sound. The design incorporates first and second electrodes to form a first capacitor, while third and fourth electrodes create a second capacitor. A controller applies a voltage to the second capacitors, maintaining constant capacitance in the first capacitors, which allows for the identification of the direction of the acoustic waves based on voltage differences.

Another significant patent involves a method of manufacturing semiconductor devices. This process includes forming an impurity precipitation region by introducing an impurity, such as oxygen, into a silicon substrate and thermally treating it. High selectivity anisotropic etching is then performed using the precipitation region as a micro mask. This technique results in a cone with a very sharp and slender needle shape, which can be utilized in various applications, including field emission devices and single electron transistors.

Career Highlights

Mitsushima has worked with prominent organizations, including Toyota Central R&D Labs and The University of Tokyo. His experience in these institutions has allowed him to collaborate on various innovative projects and further his research in technology.

Collaborations

Some of his notable coworkers include Hirofumi Funabashi and Keiichi Shimaoka. Their collaborative efforts have contributed to advancements in their respective fields.

Conclusion

Yasuichi Mitsushima's contributions to microphone and semiconductor technologies highlight his innovative capabilities and dedication to research. His patents reflect a commitment to enhancing the functionality and durability of electronic devices.