Yoshihisa Minamikawa

Title: Innovations of Yoshihisa Minamikawa

Introduction

Yoshihisa Minamikawa is a notable inventor based in Katsuta, Japan. He has made significant contributions to the field of electron and charged particle beam technology. With a total of 4 patents, his work has advanced the precision and accuracy of measuring apparatuses.

Latest Patents

One of his latest inventions is the Electron Beam Measuring Apparatus. This apparatus is designed to measure the size of patterns on the surface of a specimen. It comprises an electron gun, an electron lens for focusing the electron beam, a deflector for deflecting the beam, and a spot control means for forming a flat edge portion in the electron beam spot. The rotation coil allows the electron beam to be rotated so that the flat portion becomes perpendicular to the scanning direction, enabling high-accuracy measurements based on secondary electrons detected from the specimen surface.

Another significant invention is the Charged Particle Beam Apparatus. This apparatus focuses a beam of charged particles emitted from a source onto a target in a predetermined size and shape. It utilizes multiple aperture members, each combined with a deflecting unit that performs a two-dimensional scan in response to a supplied scan signal. The center axis of the aperture is determined based on the time-based variation in the quantity of charged particles trapped during the scan, allowing for precise adjustments to cancel out any deviations.

Career Highlights

Yoshihisa Minamikawa is currently employed at Hitachi, Ltd., where he continues to innovate in the field of particle beam technology. His work has been instrumental in enhancing the capabilities of measurement devices used in various applications.

Collaborations

He has collaborated with notable coworkers, including Yoshio Sakitani and Yoshimasa Shimura, contributing to the advancement of technology in their respective fields.

Conclusion

Yoshihisa Minamikawa's contributions to electron and charged particle beam technology have significantly impacted the precision of measurement devices. His innovative patents reflect his expertise and commitment to advancing technology in this field.