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. 15, 1991
Filed:
Jul. 13, 1989
Masatada Wachi, Hamamatsu, JP;
Yasuhiko Asahi, Hamamatsu, JP;
Yamaha Corporation, Hamamatsu, JP;
Abstract
The acoustic apparatus for generating a musical tone preferably adopts a speaker system utilizing a resonator constituted by a cavity and an acoustic mass for causing the cavity to acoustically communicate with an external region or a speaker system utilizing a back-loaded horn so that frequency characteristic is improved. In a musical instrument, including a resonator, like a guitar, all or part of a body is partitioned as the cavity, and acoustic mass such as a resonance port is disposed in the cavity as needed to set a desired resonance frequency. In a musical instrument having side plates or leg portions, the resonance port or the back-loaded horn is housed in the side plates or the leg portions.