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Detailed Program
Paper Number : PI-I01
Time Frame : 10:45~11:05
Presentation Date : Thurseday, 27, November
Session Name : Piezoelectric Materials, Devices & Applications
Session Chair 1# : HongSoo Choi
Session Chair 2# : Isaku Kanno
Energy Harvesting Devices by Piezoelectric Ceramics
Toshio OGAWA
Shizuoka Institute of Science and Technology
Recently, energy harvesting for energy conversion between electrical energy and mechanical energy in piezoelectric ceramics has been focused on to obtain clean energy. It has various practical uses, such as a floor for electrical generation (electricity-generating floor) at ticket gates in the Tokyo terminal of Japan Railway East Company (JR-East) and LED light illumination for the Metropolitan Expressway generating electricity through the deformation of bridge piers passing through automobiles. We developed new piezoelectric energy harvesting devices utilizing the resonance vibration of piezoelectric ceramics [1]. By applying a piezo-buzzer, new devices such as a night-view footwear [2], a piezo-walker, and so forth could be developed. While an external force was added to a buzzer, a lead zirconate titanate (PZT) unimorph in the buzzer, the ceramic disk diameter, thickness, and capacitance of which were respectively 14 mm, 0.2 mm, and 10 nF, generated resonance vibration. As a result, alternating voltages of around 30 V and a frequency of 5 kHz were observed. When the generated voltages (Figure 1) were applied to a LED lamp, new devices such as a night-view footwear [Figure 2(a)], a piezo-walker [Figure 2(b)] and a display panel composed of a new type of electricity-generation floor were developed. It was confirmed that the piezo-buzzer for energy harvesting utilizing resonance vibration is an effective tool for obtaining clean energy.
Acknowledgements : This work was partially supported by Grant 2010 of B-nest at Shizuoka City, Japan, a Grant of Strategic Research Foundation Grant-aided Project for Private Universities 2010-2014 (No. S1001032) from the Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT), and Research Foundations 2012 and 2013 between Academy and Industry of Fukuroi City, Shizuoka, Japan.