Patent ID: 8082898
Filing Date: 2011-12-27
Classification: F02B,F02M,Y02T

Abstract:
1. A resonator comprising: a neck portion; and a resonator main body comprising: wherein the resonator main body is configured to have both (i) a Helmholtz-resonator functional part whose resonance frequency is determined based on a total volumetric capacity of the resonator main body, substantially corresponding to a summed value of a volume of the main volume chamber and a volume of the sub-volume chamber, and (ii) a side-branch-resonator functional part whose resonance frequency is determined based on a summed length of a longitudinal length of the sub-volume chamber and a length of a hypothetical extension of the sub-volume chamber, which extension is obtained by hypothetically extending the sub-volume chamber into the main volume chamber in a longitudinal direction of the sub-volume chamber.