The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 16, 2021
Filed:
Mar. 26, 2020
Panasonic Corporation, Osaka, JP;
Kyoto University, Kyoto, JP;
National University Corporation Yokohama National University, Kanagawa, JP;
Hidetoshi Hiraoka, Kyoto, JP;
Yoshinobu Tsujii, Kyoto, JP;
Keita Sakakibara, Kyoto, JP;
Ken Nakano, Kanagawa, JP;
Panasonic Corporation, Osaka, JP;
KYOTO UNIVERSITY, Kyoto, JP;
National University Corporation YOKOHAMA National University, Kanagawa, JP;
Abstract
An electroacoustic transducer includes: a diaphragm; a magnetic circuit having a magnetic gap; a frame that holds the diaphragm and the magnetic circuit; a voice coil having one end portion positioned within the magnetic gap and the other end portion coupled to the diaphragm; and a low friction material that is disposed in a sliding portion formed by the voice coil and the magnetic circuit, and includes polymer compounds swollen with liquid.