Electric-mechanical-acoustic converter and method for producing the same

Patent 6570993 Issued on May 27, 2003. Estimated Expiration Date:

August 16, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Electromagnetic resonant vibrator
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Inventor

Fukuyama, Takanori

Assignee

Matsushita Electric Industrial Co., Ltd.

Application

No. 331902 filed on 08/16/1999

US Classes:

381/396, Electromagnetic (e.g., dyynamic)340/388.1, Diaphragm (e.g., horn or buzzer)381/412Magnetic circuit

Examiners

Primary: Le, Huyen

Attorney, Agent or Firm

Ratnerprestia

Foreign Patent References

9-261917 JP. 10/13/1997
9-267075 JP. 10/13/1997

International Class

H04R 025/00

Foreign Application Priority Data

1997-10-30 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 (14) supporting a movable portion (19) formed of the magnetic circuit portion (17) and a weight portion (13), and a frame (9) supporting a diaphragm (8) and the suspension (14), a space in an elastic deformation range of the suspension (14) being provided between the outer periphery of the movable portion (19) and the frame (9). 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 (19) is received by the frame (9), whereby the suspension (14) can be prevented from being permanently deformed.