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:
Sep. 06, 2011
Filed:
Jan. 28, 2009
Rento Tanase, Iwata, JP;
Yasutaka Nakamura, Hamamatsu, JP;
Atsushi Yoshida, Hamamatsu, JP;
Masaru Matsushita, Hamamatsu, JP;
Kunio Hiyama, Hamamatsu, JP;
Rento Tanase, Iwata, JP;
Yasutaka Nakamura, Hamamatsu, JP;
Atsushi Yoshida, Hamamatsu, JP;
Masaru Matsushita, Hamamatsu, JP;
Kunio Hiyama, Hamamatsu, JP;
Yamaha Corporation, Shizuoka-ken, JP;
Abstract
A sound absorbing structure is constituted of a housing having a hollow portion and an opening and a vibration member composed of a board or diaphragm. The vibration member is a square-shaped material having elasticity composed of a synthetic resin and is bonded to the opening of the housing, thus forming an air layer closed inside the sound absorbing structure by the housing and the vibration member. In the sound absorbing structure, when the lateral/longitudinal dimensions of the air layer and characteristics of the vibration member (e.g. a Young's modulus, thickness, and Poisson's ratio) are set such that the fundamental frequency of a vibration occurring in a bending system falls within 5% and 65% of the resonance frequency of a spring-mass system, a vibration mode having a large amplitude occurs in a frequency band lower than the resonance frequency of the spring-mass system, this improving the sound absorption coefficient.