Ultra-thin planar magnetic film full-frequency speaker

1. An ultra-thin planar magnetic film full-frequency speaker, characterized in that, it comprises: a vibration system, a magnetic system, a frame, and an acoustic foam; wherein the vibration system and the magnetic system are received and fixed in the interior of the frame;

the vibration system comprises a vibration film and a planar voice coil, the vibration film forming a contiguous inward recess structure in the middle thereof, the planar voice coil being extended around a bar shaped aperture, and the planar voice coil being adhered and fixed to the vibration film; and

the magnetic system comprises a U-shaped soft iron and a bar-shaped magnet, the bar-shaped magnet being disposed above the U-shaped soft iron and disposed beneath the bar-shaped aperture, the U-shaped soft iron being connected to the frame by means of injection molding, and the acoustic foam being adhered to a bottom face of the U-shaped soft iron.

2. The ultra-thin planar magnetic film full-frequency speaker according to claim 1 , wherein the vibration film comprises a vibration plate and an edge surrounding the vibration plate, the vibration film being fixed and connected to the edge by means of bonding or in-mold injection molding, and the vibration film being adhered and fixed to the frame by means of the edge.

3. The ultra-thin planar magnetic film full-frequency speaker according to claim 2 , wherein the vibration plate downwardly forms a contiguous square groove, and the vibration plate has a square wave form-shaped section.

4. The ultra-thin planar magnetic film full-frequency speaker according to claim 3 , wherein the vibration plate is made from an aluminum magnesium alloy or a plastic polymer material, and the vibration plate is additionally provided with a reinforcing rib.

5. The ultra-thin planar magnetic film full-frequency speaker according to claim 2 , wherein the edge is downwardly recessed to form an inner R-shaped structure, or upwardly protrudes to form an outer R-shaped structure, or upwardly protrudes twice to form a double-outer R-shaped structure, or consecutively upwardly protrudes to form a W-shaped structure; and the edge is made from a rubber material or a polyurethane material or a silk material, and the edge is additionally provided with a reinforcing rib.

6. The ultra-thin planar magnetic film full-frequency speaker according to claim 1 , wherein the planar voice coil comprises a conductive coil and a planar thin film, the conductive coil being printed on the planar thin film, and the bar-shaped aperture being provided in the planar thin film.

7. The ultra-thin planar magnetic film full-frequency speaker according to claim 6 , wherein the conductive coil comprises a linear coil portion and a bent coil portion, the linear coil portion being adhered and fixed to a contiguous square groove, and the bent coil portion being adhered to two sides of the vibration film.

8. The ultra-thin planar magnetic film full-frequency speaker according to claim 1 , wherein the bottom of the U-shaped soft iron is provided with a vent hole, the acoustic foam being adhered to the vent hole.

9. The ultra-thin planar magnetic film full-frequency speaker according to claim 1 , wherein the bar-shaped magnet is a rectangular neodymium magnet, and each bar-shaped magnet is formed of three small square magnets.

10. The ultra-thin planar magnetic film full-frequency speaker according to claim 1 , wherein the ultra-thin planar magnetic film full-frequency speaker has an integral thickness of not greater than 8 mm.