Patent ID: 8379905

Claim:
A micro-speaker comprising: a frame; a case supported on the frame and cooperatively with the frame defining a chamber therebetween; a diaphragm received in the chamber and attached to the frame; a yoke received in the chamber; a magnet received in the chamber and attached on the top of the yoke; a pole plate received in the chamber and attached to the top of the magnet; a connecting plate received in the chamber and defining a central portion attached to the bottom of the diaphragm, and an oblique sidewall obliquely connecting to the central portion; a voice coil wrapped round the oblique sidewall of the connecting plate and surrounding the magnet and the pole plate; and wherein the oblique sidewall defines a first part obliquely connecting to the central portion, and a second part connecting with the first part and extending downwardly perpendicular to the central portion, the voice coil is wrapped round the second part of the oblique sidewall, and together with the second part moves up and down in a magnet gap formed between the magnet and the inner wall of the yoke when an electric current applied to the voice coil.