Yoko Ishitsuka

Title: Yoko Ishitsuka: Innovator in Synthetic Quartz Glass Technology

Introduction

Yoko Ishitsuka is a prominent inventor based in Joetsu, Japan. She has made significant contributions to the field of synthetic quartz glass technology, holding a total of 5 patents. Her work focuses on the development and manufacturing methods of large-size synthetic quartz glass substrates, which are essential in various high-tech applications.

Latest Patents

One of her latest patents is for a large-size synthetic quartz glass substrate, which features a diagonal length of at least 1,000 mm. This invention includes an evaluation method that partitions the effective range on the substrate surface into multiple overlapping evaluation regions, achieving a flatness of up to 3 µm in each region. This high flatness and minimal local gradient are crucial for preparing large-size photomasks. Another notable patent involves a method for producing synthetic quartz glass substrates, which includes arranging spacers and plate materials in contact with the substrate's outer peripheral surfaces and sandblasting the substrate's surface.

Career Highlights

Yoko has worked with notable companies such as Shin-Etsu Chemical Co., Ltd. and Shin-Etsu Chemical Corporation. Her experience in these organizations has allowed her to refine her expertise in synthetic quartz glass technology and contribute to innovative solutions in the industry.

Collaborations

Throughout her career, Yoko has collaborated with talented individuals, including Atsushi Watabe and Masaki Takeuchi. These partnerships have fostered a creative environment that has led to groundbreaking advancements in her field.

Conclusion

Yoko Ishitsuka is a trailblazer in the realm of synthetic quartz glass technology. Her innovative patents and collaborative efforts have significantly impacted the industry, showcasing her dedication to advancing technology.