公开(公告)号：US20210183584A1

公开(公告)日：2021-06-17

申请号：US17116204

申请日：2020-12-09

Applicant: DENSO CORPORATION ,  TOKYO UNIVERSITY OF SCIENCE FOUNDATION

Inventor： Noriyuki Matsushita ,  Yoshihiro Kozawa ,  Kazuhiko Kanoh ,  Yumi Tanaka ,  Hirotoshi Otsuka ,  Yuki Kotaka

IPC: H01G7/02 ,  C01F17/34 ,  C01B25/32

Abstract: An electret includes an electret layer. The electret layer is formed by subjecting a composite film in which inorganic dielectric particles are dispersed and held in a base film to a polarization treatment. The inorganic dielectric particles are mainly composed of an inorganic dielectric material having a bandgap energy of 4 eV or more.

公开(公告)号：US11915883B2

公开(公告)日：2024-02-27

申请号：US17116204

申请日：2020-12-09

Applicant: DENSO CORPORATION ,  TOKYO UNIVERSITY OF SCIENCE FOUNDATION

Inventor： Noriyuki Matsushita ,  Yoshihiro Kozawa ,  Kazuhiko Kanoh ,  Yumi Tanaka ,  Hirotoshi Otsuka ,  Yuki Kotaka

IPC: H01G7/02 ,  C01F17/34 ,  C01B25/32

CPC classification number: H01G7/025 ,  C01B25/32 ,  C01F17/34 ,  C01P2002/34 ,  C01P2006/40

Abstract: An electret includes an electret layer. The electret layer is formed by subjecting a composite film in which inorganic dielectric particles are dispersed and held in a base film to a polarization treatment. The inorganic dielectric particles are mainly composed of an inorganic dielectric material having a bandgap energy of 4 eV or more.