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:
Jul. 08, 2003
Filed:
Mar. 11, 1999
Takeshi Nakamura, Uji, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A speaker device is capable of accurately generating sound even within a high audio region, without high sound pressure even when generating a large sound. The speaker device includes a sound-producing vibrator having a vibrating body which is, for instance, a semi-spherical piezoelectric ceramic. Electrodes are provided on both surfaces of the vibrating body. An input signal from an amplifier is input between the electrodes so that the vibrating body is vibrated and sound is produced. The resonant frequency of the sound-producing vibrator is set higher than about 20 kHz, which is the upper limit of the human audible range. Furthermore, the thickness of the vibrating body is increased and its mass is increased.