Hirofumi Yamada

Title: Hirofumi Yamada: Innovator in Electret Capacitor Microphone Technology

Introduction

Hirofumi Yamada is a notable inventor based in Sakai, Japan. He has made significant contributions to the field of audio technology, particularly with his innovative work on electret capacitor microphones. His expertise and inventions have garnered attention in the industry.

Latest Patents

Hirofumi Yamada holds a patent for an electret condenser microphone. This invention features an electro-acoustic transducer that includes an electret portion with a diaphragm acting as an electrode and a stationary electrode positioned in opposition to the diaphragm. Additionally, the design incorporates a FET that performs impedance conversion on the output from the transducer, subsequently outputting the converted signal on a designated line. The microphone also includes a capacitor and a varistor arranged in parallel between the signal line and ground, along with a resistor in series within the signal line. This innovative design enhances the performance and reliability of the microphone.

Career Highlights

Hirofumi Yamada is associated with Hosiden Corporation, where he has been instrumental in advancing microphone technology. His work has contributed to the development of high-quality audio devices that are widely used in various applications.

Collaborations

Hirofumi Yamada collaborates with Shinichi Saeki, a fellow innovator in the field. Their partnership has led to advancements in audio technology and has fostered a creative environment for innovation.

Conclusion

Hirofumi Yamada's contributions to the field of electret capacitor microphones exemplify his dedication to innovation and technology. His patent and work at Hosiden Corporation highlight his role as a key figure in audio technology advancements.