Keizo Ishiwatari

Title: Keizo Ishiwatari: Innovator in Magnetic Technology and Speaker Design

Introduction

Keizo Ishiwatari is a notable inventor based in Kobe, Japan. He has made significant contributions to the fields of magnetic technology and audio equipment design. With a total of 4 patents to his name, Ishiwatari's work has had a lasting impact on the industry.

Latest Patents

One of Ishiwatari's latest inventions is a magnetic erasing head designed for erasing magnetic recording media, such as magnetic tape. This innovative device features a head surface that makes sliding contact with the tape surface. The head surface incorporates both a permanent magnet material and a high permeability material. The permanent magnet material is strategically magnetized to create alternating polarities, with a field strength that gradually decreases from the inlet side to the exit side of the head surface. This design ensures that the magnetic tape erased by the head does not induce secondary harmonic distortion due to the mutual cancellation of residual magnetism.

Another significant patent is for a method of making a metal-coated foil speaker diaphragm. This speaker diaphragm is created by forming a boron layer on one face of a dome-shaped metal foil using a physical vapor deposition method. The resulting diaphragm is lightweight, has a high modulus, and provides appropriate internal mechanical resistance against vibration. This innovation leads to a speaker with high efficiency and excellent sound characteristics.

Career Highlights

Keizo Ishiwatari is associated with Matsushita Electric Industrial Co., Ltd., a company known for its advancements in electronics and technology. His work at this esteemed organization has allowed him to develop and refine his innovative ideas.

Collaborations

Ishiwatari has collaborated with notable coworkers, including Hidetsugu Kawabata and Hideaki Inoue. These partnerships have contributed to the successful development of his inventions and have fostered a collaborative environment for innovation.

Conclusion

Keizo Ishiwatari's contributions to magnetic technology and speaker design exemplify his innovative spirit and dedication to advancing technology. His patents reflect a commitment to improving audio quality and magnetic media applications.