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:
Dec. 28, 2004
Filed:
Apr. 22, 2002
Nozomi Toki, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
This invention has been made to provide a speaker system capable of miniaturization and presenting a good sound quality. A speaker is mounted on a printed circuit board arranged inside a telephone body enclosure . Acoustic waves of positive phase produced by vibration of a diaphragm of the speaker are output through front acoustic apertures and a front air chamber to the exterior from an enclosure acoustic aperture . On the other hand, the acoustic waves of opposite phase enter a rear air chamber through rear acoustic apertures , reach an enclosure internal space through an opposite-phase opening provided by cutting away a part of a rear sealing member , and transmit to a card slot , then being output to the exterior. The opposite-phase opening as an opening allows the acoustic waves to be output in a direction remotest from the card slot , so that the acoustic waves of opposite phase are output to the extension through the remotest path in the enclosure of the speaker resulting in reducing interference of the acoustic waves of positive phase and negative phase. This enables realization of a speaker system of small size but of a good sound quality.