Patent ID: 9338543
Filing Date: 2016-05-10
CPC Classification: H04R

Claim Text:
1. An earphone device comprising: a housing defining a cavity and a plurality of vent holes acoustically coupled to the cavity; a speaker diaphragm received in the cavity and configured to produce sound; and a sealing cap configured to hermetically close the housing and having at least one opening defined therethrough; wherein the sealing cap and the housing cooperate to define an air chamber acoustically coupled to both the vent holes and the opening, the vent holes are configured to transfer the sound produced by the speaker diaphragm into the air chamber, the air chamber serves as an acoustic resonator to resonate and amplify sound waves of certain frequencies, the opening is configured to allow the sound transfer from the air chamber to outside of the air chamber, and resonant frequencies are regulated by regulating shape and size of the air chamber and/or shape, size and amount of the opening.