Company Filing History:
Years Active: 1984
Title: Nobuhiko Nakagawa: Innovator in Piezoelectric Loudspeaker Technology
Introduction
Nobuhiko Nakagawa is a prominent inventor based in Ishikawa, Japan. He has made significant contributions to the field of audio technology, particularly in the development of piezoelectric loudspeakers. With a total of 2 patents to his name, Nakagawa's work has advanced the capabilities of sound generation.
Latest Patents
One of Nakagawa's latest patents is a piezoelectric loudspeaker that utilizes a thin plate of piezoelectric ceramics with a high dielectric constant. This innovative design involves fixing a piezoelectric transducer, which includes a thin plate of piezoelectric ceramic, onto a diaphragm stretched on a frame. This configuration allows the sound generator to achieve a resonance frequency set at the low frequency band side of the audio frequency region, while the cavity formed by the frame is tuned to the high frequency band side. The use of high dielectric constant piezoelectric ceramics enables the loudspeaker to be ultrathin and capable of covering the entire audio frequency range.
Another notable patent by Nakagawa is a piezoelectric loudspeaker featuring a bending mode piezoelectric diaphragm. This diaphragm is mounted on a diaphragm stretched across a frame, with its central portion supported by a stationary support provided at the frame. This design ensures that the central portion of the piezoelectric diaphragm remains free from vibrations, resulting in a higher sound pressure level and reduced acoustic distortion compared to conventional loudspeakers.
Career Highlights
Nobuhiko Nakagawa is currently associated with Murata Manufacturing Co., Ltd., a leading company in electronic components and devices. His work at Murata has allowed him to focus on innovative audio technologies that enhance sound quality and performance.
Collaborations
Throughout his career, Nakagawa has collaborated with notable colleagues, including Tsutomu Yoshii and Sasuga Kakehi. These collaborations have contributed to the advancement of audio technology and the development of new inventions.
Conclusion
Nobuhiko Nakagawa's contributions to the field of piezoelectric loudspeakers demonstrate his innovative spirit and commitment to advancing audio technology. His patents reflect a deep understanding of sound generation and the potential for future developments in this area.