Hiroaki Miyaji

Title: Hiroaki Miyaji: Innovator in Photomask Technology

Introduction

Hiroaki Miyaji is a prominent inventor based in Taito-ku, Japan. He has made significant contributions to the field of photomask technology, holding a total of 2 patents. His work focuses on enhancing the precision and efficiency of exposure apparatuses used in semiconductor manufacturing.

Latest Patents

Miyaji's latest patents include innovative designs for photomasks and exposure apparatuses. The first patent describes a photomask that features a body with a surface where a mask pattern is formed. This mask pattern is designed to be scanned and subjected to pattern transfer to a resist through a lens assembly. The design includes a first region for pattern transfer at the connecting portion of the lens assembly and a second region at the non-connecting portion. Notably, the mask pattern incorporates a corrected line width that is adjusted through calculations to achieve a target line width as intended. This adjustment involves a stepwise change in line width based on a random number, enhancing the accuracy of the pattern transfer process.

The second patent outlines an exposure apparatus that consists of a first light source generating exposure light, a diaphragm with multiple openings, and several projection optical systems. These systems project optical images onto an exposure target. Additionally, the apparatus includes a second light source and a correction stepper that limits the irradiation range of the exposure target. This innovative design aims to improve the precision of exposure processes in semiconductor manufacturing.

Career Highlights

Miyaji has built a successful career at Toppan Printing Co., Ltd., where he has been instrumental in advancing photomask technology. His expertise and innovative approach have positioned him as a key figure in the industry.

Collaborations

Miyaji has collaborated with notable coworkers, including Akihito Okumura and Yoshinori Motoda. Their combined efforts have contributed to the development of cutting-edge technologies in the field.

Conclusion

Hiroaki Miyaji's contributions to photomask technology and exposure apparatuses have significantly impacted the semiconductor industry. His innovative patents reflect his commitment to enhancing precision and efficiency in manufacturing processes.