US 12,191,088 B2
Power generator having an electret for harvesting energy
Yoshihiro Kozawa, Kariya (JP); Noriyuki Matsushita, Kariya (JP); Kazuhiko Kano, Kariya (JP); Yumi Tanaka, Tokyo (JP); Hiroki Otsuka, Tokyo (JP); and Yusuke Edano, Tokyo (JP)
Assigned to DENSO CORPORATION, Kariya (JP); and TOKYO UNIVERSITY OF SCIENCE FOUNDATION, Tokyo (JP)
Filed by DENSO CORPORATION, Kariya (JP); and TOKYO UNIVERSITY OF SCIENCE FOUNDATION, Tokyo (JP)
Filed on Aug. 12, 2022, as Appl. No. 17/886,548.
Application 17/886,548 is a continuation of application No. PCT/JP2021/006745, filed on Feb. 24, 2021.
Claims priority of application No. 2020-032538 (JP), filed on Feb. 28, 2020.
Prior Publication US 2022/0384116 A1, Dec. 1, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H01G 7/02 (2006.01); H02N 1/08 (2006.01)
CPC H01G 7/025 (2013.01) [H02N 1/08 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A power generator comprising:
a power generating unit including:
an electret having a first charged surface and a second charged surface that are charged with opposite polarities;
a first electrode formed on the first charged surface; and
a second electrode formed on the second charged surface; and
at least one of a power storage unit or an output unit, the at least one of the power storage unit or the output unit being electrically connected to the power generating unit, wherein
the electret is formed by polarizing an electret material that includes an inorganic dielectric having a bandgap energy of 4 eV or more, and
at least one of the first electrode or the second electrode are partially disposed on the corresponding charged surface such that at least one of the first charged surface or the second charged surface has a portion as a current collecting surface that is exposed outward.