Patent ID: 8311264

Claim:
An ultra-thin speaker, comprising: a) a metal upper casing, having an external surface, an internal surface, and one or more sound holes formed at the middle of the metal upper casing; b) a vibrating membrane, positioned at the internal surface of the metal upper casing; c) a voice coil, positioned at the bottom of the vibrating membrane; d) a support frame, positioned at the bottom of the metal upper casing and the vibrating membrane, and having a first hollow hole formed at the middle of the support frame; e) a magnet, positioned in the first hollow hole; f) a yoke, positioned at the bottom of the support frame; and g) a metal lower casing, positioned corresponding to the metal upper casing, and having an external surface and an internal surface, and provided for covering the aforementioned components between the two corresponding internal surfaces, and forming a contact surface with the yoke; such that after the yoke conducts heat of a heat source to the metal lower casing, the heat is conducted to the metal upper casing through a connection and a contact between the upper and lower casings to increase a heat dissipating area; wherein the metal upper casing has an inverted U-shaped cross-section contour to form a protrusion at the middle of the metal upper casing, and a flange around the periphery of the upper metal casing; the metal lower casing has a U-shaped cross-section contour to form a recession at the middle of the metal lower casing and a contact surface around the periphery of the metal lower casing, and the contact surface is embedded into an internal surface of the protrusion of the metal upper casing; and the metal lower casing includes a recession having a second hollow hole, and a radial depression formed at an internal rim of the second hollow hole and a notch formed at an external rim of the second hollow hole.