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:
Apr. 20, 2004
Filed:
Mar. 10, 2003
Takanori Fukuyama, Hisai, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention relates to an electric-mechanical-acoustic converter used mainly in a mobile telephone and the like, and its objective is to provide a high-quality product in which damage and degradation of performance caused by shock due to a drop are prevented. In order to achieve this objective, the present invention includes at least one suspension ( ) supporting a movable portion ( ) formed of the magnetic circuit portion ( ) and a weight portion ( ), and a frame ( ) supporting a diaphragm ( ) and the suspension ( ), a space in an elastic deformation range of the suspension ( ) being provided between the outer periphery of the movable portion ( ) and the frame ( ). Even in the case where a portable terminal apparatus is dropped, and the electric-mechanical-acoustic converter built therein is subjected to shock, the outer periphery of the movable portion ( ) is received by the frame ( ), whereby the suspension ( ) can be prevented from being permanently deformed.