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:
Mar. 12, 2019
Filed:
Jan. 09, 2015
Pioneer Corporation, Kanagawa, JP;
Tohoku Pioneer Corporation, Yamagata, JP;
Kazuaki Watanabe, Yamagata, JP;
Junichi Sato, Yamagata, JP;
Susumu Miyata, Aichi, JP;
Makoto Tsuruta, Aichi, JP;
PIONEER CORPORATION, Tokyo, JP;
TOHOKU PIONEER CORPORATION, Yamagata, JP;
ANDEN CO., LTD., Aichi, JP;
Abstract
Provided is a speaker device in which reproduction sound pressure is increased, and heat resistance and water resistance are improved. The speaker device includes: a diaphragm formed of a film containing polyimide; and a frame for supporting the diaphragm. A cross-section passing the center of the diaphragm and parallel to a sound emission direction includes sequentially from an inner periphery to an outer periphery of the diaphragm along the sound emission direction: a first bent plate portion having a concave arc; a second bent plate portion having a convex arc; a third bent plate portion having a concave arc; and a fourth bent plate portion having a convex arc. An area of the first bent plate portion is larger than any of areas of the second, the third, the fourth bent plate portions.