Company Filing History:
Years Active: 1997
Title: Inventor Profile: Hidehito Yamada
Introduction
Hidehito Yamada is a notable inventor based in Takasaki, Japan. He has made significant contributions to the development of positioning devices for optical disc apparatuses. With a focus on enhancing the precision of optical systems, Yamada has secured his place in the innovative landscape of technology.
Latest Patents
Yamada holds a patent for a "Positioning Device for Optical Disc Apparatus." This innovative system features a focus error detecting part that identifies a focus error signal corresponding to the focal shift of a light spot on the information recording surface of an optical disc. The design includes a light spot moving part that operates in a direction substantially perpendicular to the optical disc surface. The invention also comprises a first and second digital arithmetic part that process the focus error signal to output control signals, ultimately driving the light spot moving part via a drive circuit. Importantly, the arithmetic operations within the digital circuits are conducted at different sampling periods, enhancing overall functionality and accuracy.
Career Highlights
Hidehito Yamada is associated with Hitachi, Ltd., a leading company in technology and innovation. His work there has allowed him to contribute effectively to the development of optical disc technology, showcasing his expertise and commitment to advancing the field.
Collaborations
Throughout his career, Yamada has collaborated with esteemed colleagues, including Atsushi Okuyama and Takashi Yoshida. These collaborations have further enriched his inventiveness and supported advancements in their shared field of optical technologies.
Conclusion
With a patent that showcases his ingenuity and technical skill, Hidehito Yamada stands out as a dedicated inventor in the optical technology sector. His contributions at Hitachi, Ltd., combined with his collaborative efforts with fellow professionals, make him an integral part of the innovation community in Japan.