Patent ID: 7174148

Claim:
A receiver comprising: a housing having a front side, a rear side, and a plurality of sound holes extended through said front side; a rear yoke mounted inside said housing, said rear yoke having an annular base spaced from the rear side of said housing at a distance, and a tubular body forwardly extended from said annular base; an annular magnet disposed around the tubular body of said rear yoke and stopped at a front side of said annular base; a front yoke disposed around the tubular body of said rear yoke and stopped at a front side of the annular magnet; a vibration diaphragm mounted inside said housing and stretched in front of said rear yoke and said front yoke; a voice coil connected to a back side of said vibration diaphragm and suspended in an annular space between said front yoke and the tubular body of said rear yoke; and a first acoustic paper bonded to the annular base of said rear yoke to block said tubular body of said rear yoke; wherein said housing has at least one air hole in the rear side and a second acoustic paper blocking said at least one air hole; a first cushion is mounted inside the tubular body of said rear yoke, said first cushion being a tubular member having a periphery thereof disposed in contact with an inner diameter of the tubular body of said rear yoke; a second cushion mounted in an annular gap between said annular magnet and the tubular body of said rear yoke, said second cushion being an annular member having inner and outer diameters respectively disposed in contact with a periphery of the tubular body of said rear yoke and an inner diameter of said annular magnet and spaced from said front yoke at a distance.