Patent ID: 8428294

Claim:
A slim speaker, comprising: a casing having an enlarged front opening and a rear end with a magnetic circuit mounted thereto; a voice coil being fitted over a central area of the magnetic circuit; a diaphragm being located between the enlarged front opening of the casing and the voice coil; and a damper being located behind the diaphragm to space from the latter; wherein the damper has an inner circumferential edge directly attached to the voice coil; wherein the diaphragm is characterized by having at least one V-shaped bent section provided at a middle portion thereof attached to a corresponding position on the damper; wherein one end of the diaphragm is attached to the enlarged front opening of the casing and another end of the diaphragm is directly attached to the voice coil, separately from and at a different position than the damper; and whereby the diaphragm has an effectively reduced overall height to largely reduce a volume of the slim speaker in a fully assembled state, and to stabilize a vibration of the voice coil for producing good resonance of sound; wherein the casing is a shallow dish-like member having a stepped peripheral wall to internally define a shoulder portion, the size reduced flat bottom being connected to the stepped peripheral wall; wherein the diaphragm is connected to the enlarged front opening of the casing via a yoke, and a bottom surface of the magnetic circuit is fitted in a central opening of the flat bottom of the casing so that the bottom surface of the magnetic circuit is flush with the flat bottom of the casing and, when the magnetic circuit is installed, the entire bottom surface of the slim speaker is flat from one stepped peripheral wall to the other stepped peripheral wall.