Location History:
- 167 Tokyo, JP (1996)
- Tokyo 165, JP (1999)
- Tokyo Metropolis, JP (2001)
- Nakano-ku, JP (2008)
- Nakano, JP (2006 - 2009)
- Nakano JP (2009)
- Nakano-ku, Tokyo, JP (2007 - 2010)
- Tokyo, JP (2004 - 2021)
Company Filing History:
3 out of 4 
3 out of 3 
2 out of 2 
Years Active: 1996-2021
Title: **Masakazu Ushijima: A Pioneer in Wireless Power Technology**
Introduction
Masakazu Ushijima, based in Tokyo, Japan, is a prolific inventor known for his contributions to wireless power transfer systems. With a total of 21 patents to his name, Ushijima has established himself as a significant figure in the realm of innovative technologies.
Latest Patents
One of Ushijima's notable recent patents involves a sophisticated wireless power transfer system. In this system, a resonant circuit is created on the secondary coil side. The phase information of a resonant current flowing within the resonant circuit is diligently detected. Based on this phase information, a driving frequency is determined, ensuring the current phase of a driving current flowing in the primary coil slightly lags behind the voltage phase, facilitating optimal driving of the primary coil. The Q value, which is defined by the leakage inductance of the secondary coil, the capacitance of a resonant capacitor, and the equivalent load resistance, is established to be greater than or equal to the value determined by the formula Q=2/k, where k represents the coupling coefficient.
Career Highlights
Throughout his career, Ushijima has been associated with several technology-driven companies, including Greatchip Technology Co., Ltd. His extensive experience and innovative mindset have led him to contribute to advancements in wireless power technology, pushing the boundaries of this crucial field.
Collaborations
Masakazu Ushijima has collaborated with prominent colleagues such as Koji Kawamoto and Hajime Yuasa. Their teamwork and shared vision have played a pivotal role in the development of groundbreaking technologies and have contributed to Ushijima's reputation as a leading inventor.
Conclusion
In summary, Masakazu Ushijima stands out as a key innovator in the wireless power transfer domain. His impressive portfolio of patents reflects his dedication to advancing technology, and his collaborative efforts with other skilled professionals underline the importance of teamwork in driving innovation. As the field of wireless power continues to evolve, Ushijima's contributions will undoubtedly inspire future generations of inventors.