This inventor holds 2 USPTO granted patents. Top assignee: Nec Corporation. Active years: 1996-2009.
Location History:
- Tokyo, JP (1996)
- Minato-ku, JP (2009)
Company Filing History:
Years Active: 1996-2009
Title: Sunao Hamamura: Innovator in Piezoelectric Technology
Introduction
Sunao Hamamura is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of piezoelectric technology, holding 2 patents that showcase his innovative approach to engineering solutions.
Latest Patents
Hamamura's latest patents include a drive circuit for a piezoelectric pump and a cooling system that utilizes this drive circuit. The piezoelectric element of the pump is driven by an output signal from an amplifier, which takes input from a sine wave oscillator. This oscillator operates at the same frequency as the piezoelectric element, allowing for efficient energy transfer. The amplifier is powered by a high voltage obtained from a low-voltage power supply through a voltage-boosting converter. This setup enables the piezoelectric element to be driven by a low-frequency sine wave of high voltage. Additionally, the frequency and amplitude of the sine wave oscillation are adjusted by control circuits that respond to temperature sensors.
Another significant patent involves the control of switching devices in a synchronized-rectification system. This DC-DC converter features a switching pulse generator that creates multiple switching pulse signals for operating a primary switch and a synchronized-rectifying circuit. The generator produces pulse signals with varying widths based on different control voltages, which are derived from a voltage divider with a variable-impedance device. The timing of the synchronized-rectifying circuit is intentionally offset from that of the primary switch to optimize performance.
Career Highlights
Sunao Hamamura is currently employed at NEC Corporation, where he continues to develop innovative technologies. His work has had a significant impact on the efficiency and functionality of electronic devices.
Collaborations
Throughout his career, Hamamura has collaborated with talented individuals such as Yosuke Shinada and Mitsuru Yamamoto. These partnerships have fostered a creative environment that encourages the development of groundbreaking technologies.
Conclusion
Sunao Hamamura is a distinguished inventor whose work in piezoelectric technology has led to significant advancements in the field. His innovative patents and contributions to NEC Corporation highlight his commitment to engineering excellence.