Hisao Fujita

Title: Hisao Fujita: Innovator in Optical Technology

Introduction

Hisao Fujita is a prominent inventor based in Hachioji, Japan. He has made significant contributions to the field of optical technology, holding a total of 8 patents. His work primarily focuses on advancements in optical lenses and recording systems.

Latest Patents

Fujita's latest patents include an innovative objective lens and optical head designed for reproducing data from optical disks. The objective lens features a numerical aperture (NA) of 0.6 for DVDs with a thickness of 0.6 mm and an NA of 0.42 for CDs with a thickness of 1.2 mm. A slight stepped portion is formed at the boundary of NA 0.42 to establish a phase difference. The designed wavelength is 0.635 µm, with an optimum substrate thickness of approximately 0.8 mm. While reproducing DVDs, the wave front aberration is around 0.025λ, ensuring high-quality signal reproduction. Additionally, he has developed an image recording apparatus that utilizes a light beam recording system, which includes an optical image surface correction system to enhance the curvature of the field during scanning.

Career Highlights

Fujita has worked with notable companies such as Konishiroku Photo Industry Co., Ltd. and Hitachi, Ltd. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking innovations in optical technology.

Collaborations

Some of his notable coworkers include Tomoko Wakabayashi and Hiroyuki Yamazaki. Their collaboration has likely played a role in advancing the projects they have worked on together.

Conclusion

Hisao Fujita's contributions to optical technology through his patents and career achievements highlight his importance in the field. His innovative work continues to influence advancements in optical systems and data reproduction.