Hisashi Maehara

Title: The Innovative Journey of Hisashi Maehara

Introduction

Hisashi Maehara, an accomplished inventor based in Itano-gun, Japan, has made significant contributions to the field of magnetic materials through his innovative inventions. With a remarkable portfolio of 12 patents, he continues to push the boundaries of technology, particularly in the realm of rare earth magnets.

Latest Patents

Among Hisashi Maehara's latest patents are two notable innovations:

1. **Method of producing bonded magnet comprising SmFeN-based anisotropic magnetic powder**

This patent details a method for preparing a SmFeN-based anisotropic magnetic powder. The process involves dispersing the powder using either resin-coated metal or ceramic media, resulting in a fine powder with an average particle size of less than 2.5 μm. The powder exhibits a residual magnetization of at least 130 emu/g and maintains an oxygen content lower than 0.75% by mass.

2. **Rare earth magnet and production method thereof**

This invention introduces a Sm—Fe—N-based rare earth magnet that is highly resistant to demagnetization, especially at elevated temperatures. The method encompasses mixing SmFeN magnetic powder with a modifier, compression-molding the mixture in a magnetic field, followed by pressure sintering, and heat treatment. Key specifications include a magnetic powder size of 1.50 μm to 3.00 μm and a modifier with a zinc content between 6% and 30%.

Career Highlights

Hisashi Maehara has been instrumental in the advancements of magnetic technology while working for notable companies such as Nichia Corporation and Toyota Motor Corporation. His work has significantly influenced the development of high-performance magnets used in various applications.

Collaborations

Throughout his career, Maehara has collaborated with talented coworkers, including Masaaki Ito and Motoki Hiraoka. Their combined expertise has led to innovative breakthroughs in the field of rare earth magnets and magnetic powders.

Conclusion

Hisashi Maehara's dedication to innovation and invention has solidified his reputation as a leading inventor in the magnetic materials sector. With cutting-edge patents and a wealth of experience from prominent manufacturers, he continues to inspire future advancements in technology.