Patent ID: 8011472

Claim:
A sound absorbing structure comprising: a housing having a hollow portion and an opening; and a vibration member composed of a board or a diaphragm, wherein the opening of the housing is covered with the vibration member, wherein a peak frequency of sound absorption, which occurs when a fundamental frequency of an elastic vibration of the vibration member cooperates with a spring component of an air layer formed in the hollow portion of the housing, is lower than a resonance frequency of a spring-mass system based on a mass of the vibration member and the spring component of the air layer of the hollow portion of the housing, and wherein the fundamental frequency of the elastic vibration of the vibration member falls within a range between 5% and 65% of the resonance frequency of the spring-mass system based on the mass of the vibration member and the spring component of the air layer of the hollow portion of the housing.