To provide a sound absorbing structure having a superior sound absorbing characteristic and an external appearance of the sound absorbing structure which does not cause flicker or the like, by disposal, for example, in the front of an air chamber, a plurality of ribs (2a) are disposed on one surface...http://www.google.com/patents/US5854453?utm_source=gb-gplus-sharePatent US5854453 - Sound absorbing body, sound absorbing plate, and sound absorbing unit
