| 摘要 |
PURPOSE: A slim type speaker is provided to prevent the output reduction of a speaker by installing a lower vibration plate under an upper vibration plate. CONSTITUTION: A bowl type frame(20) is upwardly extended along the edge of a bottom surface(21). A lower yoke(30) includes a plate member(31) combined with the bottom surface of the frame and a protrusion unit(32) which is protruded from the center to the upper side of the plate member. A ring shaped magnet(40) is laminated on the upper side of the lower yoke. A coil is wound around a bobbin unit(60). A magnetic gap is formed between an upper yoke and the lower yoke. The edge of an upper vibration plate(70) is connected to the frame through a first edge. A lower vibration plate(80) is combined with the lower side of the upper vibration plate. The lower vibration plate is inclined from the edge to the upper side thereof and is close to the bottom surface of the frame. The edge of the lower vibration plate is connected to the frame through a second edge. |
