Hirofumi Kawashima

Title: Hirofumi Kawashima: Innovator in Quartz Resonator Technology

Introduction

Hirofumi Kawashima is a prominent inventor based in Sendai, Japan. He has made significant contributions to the field of quartz resonator technology, holding a total of seven patents. His innovative approaches have led to advancements in frequency adjustment methods and resonator designs.

Latest Patents

Kawashima's latest patents include a method of adjusting the frequency of NS-GT cut quartz resonators. This method involves providing a coupling resonator with a first-order temperature coefficient and calculating the normalized frequency of the coupled vibrational modes. The goal is to set the first-order temperature coefficient to substantially zero. Another notable patent is for a torsional quartz crystal resonator, which features a specific cut type that improves frequency temperature behavior. This resonator is designed with precise thickness-to-width ratios and optimal angles to achieve desired performance characteristics.

Career Highlights

Throughout his career, Kawashima has worked with notable companies such as Seiko Electronic Components Ltd. and Seiko Electric Components Ltd. His experience in these organizations has allowed him to refine his expertise in quartz technology and contribute to various innovative projects.

Collaborations

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Conclusion

Hirofumi Kawashima's work in quartz resonator technology exemplifies the impact of innovation in engineering. His patents reflect a deep understanding of the complexities involved in frequency adjustment and resonator design. His contributions continue to influence the field and inspire future advancements.