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. 01, 2014
Filed:
Mar. 10, 2010
Akihito Mitsui, Yokohama, JP;
Shinichi Yamada, Yokohama, JP;
Akihito Mitsui, Yokohama, JP;
Shinichi Yamada, Yokohama, JP;
Mitsubishi Pencil Company, Limited, Tokyo, JP;
Abstract
A speaker unit is realized which directly drives a vibration plate having a low density, light weight, yet sufficient rigidity with a digital audio signal, and can thereby transmit vibration of a voice coil thereof to a carbonaceous acoustic vibration plate without loss. The present invention provides a digital speaker unit including a speaker body () comprising a carbonaceous acoustic vibration plate (), a delta-sigma modulator () and a thermometer code conversion section () that convert a multi-value bit digital audio signal supplied from a digital sound source () to a digital signal with required bits, a plurality of voice coils () that cause to vibrate a plurality of the carbonaceous acoustic vibration plates () provided in accordance with the number of digital signal bits and a driver circuit () that individually drives each voice coil () based on the digital signal.