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:
Jun. 02, 1987
Filed:
Jul. 02, 1985
Seiichi Hyakutake, Shizuoka, JP;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JP;
Abstract
An electronic drum has a drum body, a drumhead, a support/tension mechanism, a closed space forming member, a vibrating plate, and a piezoelectric element. The closed space forming member forms a closed air space together with the drumhead lower surface. The vibrating plate is fitted to the closed space forming member so as to divide the closed air space into plural closed air spaces. One of the divided plural closed air spaces existing between the lower surface of the drumhead and the vibrating plate serves as a transmission space. When the drumhead is struck, the vibration of the struck drumhead is transmitted to the vibrating plate via the transmission space. By this transmission via air space, same vibration at the vibrating plate is obtained irrespective of the struck portion of the drumhead if struck by same striking force. The piezoelectric element converts a pressure produced based on a mechanical vibration of the vibrating plate to an electrical signal.