Location History:
- Tokyo, JA (1977)
- Tokyo, JP (1980 - 1987)
Company Filing History:
Years Active: 1977-1987
Title: Hirofumi Yanagi: Innovator in Crystal Oscillator Technology
Introduction
Hirofumi Yanagi is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of crystal oscillator technology, holding a total of five patents. His work has advanced the efficiency and functionality of piezoelectric vibrators and oscillators.
Latest Patents
One of Yanagi's latest patents is the overtone crystal oscillator. This invention includes a crystal vibrator, a CMOS circuit connected in parallel to the crystal vibrator, and two load capacitors connected to the input and output of the CMOS circuit, respectively. The capacitors have respective capacitances C.sub.g and C.sub.d determined to satisfy at least one of the following two conditions: the first condition is that an oscillation starting resistance R.sub.KN of a desired N-th overtone is sufficiently larger than an effective resistance R.sub.QN of the crystal vibrator of the N-th overtone. Another significant patent is the electrode configuration for thickness-shear mode piezoelectric vibrator. This invention features a driving electrode on the surface of the piezoelectric vibrator that has a narrow center portion and wide right and left portions on the Z axis. This design allows the piezoelectric vibrator to operate efficiently in the fundamental main vibration while being less effective in spurious vibrations.
Career Highlights
Throughout his career, Hirofumi Yanagi has worked with prominent companies such as Kabushiki Kaisha Seikosha and Seikosha Co., Ltd. His experience in these organizations has contributed to his expertise in the field of crystal oscillators and piezoelectric technology.
Collaborations
Yanagi has collaborated with notable coworkers, including Hitoshi Ikeno and Mitsuyuki Sugita. Their combined efforts have furthered advancements in their respective fields.
Conclusion
Hirofumi Yanagi's innovative work in crystal oscillator technology has made a lasting impact on the industry. His patents reflect a deep understanding of the complexities involved in piezoelectric vibrators and oscillators. His contributions continue to influence the development of efficient electronic components.
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