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:
Oct. 16, 2018
Filed:
May. 23, 2016
Applicant:
Dai-ichi Seiko Co., Ltd., Kyoto-shi, Kyoto, JP;
Inventors:
Assignee:
DAI-ICHI SEIKO CO., LTD., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04R 1/32 (2006.01); H04R 17/00 (2006.01); H04R 7/04 (2006.01); H04R 7/06 (2006.01); H04R 3/00 (2006.01);
U.S. Cl.
CPC ...
H04R 17/00 (2013.01); H04R 1/323 (2013.01); H04R 7/04 (2013.01); H04R 7/06 (2013.01); H04R 3/00 (2013.01);
Abstract
To respond to an n-bit digital signal, a speaker () is provided that includes an sound pressure generator () including 2piezoelectric elements (, and) for an i-th bit, and a total of 2−1 stacked piezoelectric elements (, and). Due to divided vibration of the piezoelectric elements (, and), the speaker () has low directionality. Planar electrodes (, and), to which voltage is applied, are provided between the piezoelectric elements (, and). By this means, all the piezoelectric elements can be driven using similar voltages, and high sound quality can be obtained without a problem of unit-to-unit differences between voltage sources.