H. Hakamata

Third order longitudinal mode piezoelectric ceramic transformer and its application to high-voltage power inverter

S. Kawashima, A. Fukuoka, O. Ohnishi, 1994, 1994 Proceedings of IEEE Ultrasonics Symposium.

Development of color-LCD backlight inverters utilizing piezoelectric transformer

S. Kawashima, S. Tagami, H. Hakamata, 1995 .