Abstract: An ultra-thin loudspeaker structure comprises an upper drum paper, a lower drum paper, and a steel sheet. The lower drum paper defines an opening at a center thereof and is integrally formed with a surrounding raised paper section near a periphery thereof. The upper drum paper defines an opening, corresponding to the opening of the lower drum paper, at a center thereof. The upper drum paper is located within the surrounding raised paper section and adhered to the lower drum paper by its periphery. The steel sheet is provided with a sound-making member stacked by a plurality of ceramic material layer, and is sandwiched between the drum papers. Accordingly, the steel sheet can facilitate spreading sound of high and medium frequency whereas the drum papers can facilitate spreading sound of low frequency, to achieve a better reproduction of sound.

Abstract: An ultra-thin loudspeaker structure mainly includes an upper drum paper, a lower drum paper and a steel sheet. A winding semicircle-shaped protrusion is disposed in a position adjacent to an edge of the lower drum paper, and thus a frame-defining portion is formed. The lower drum paper is provided with an opening at the center. The upper drum paper has an area approximately equal to that of an inner edge of the frame-defining portion. The upper drum paper is provided with an opening at the center. The steel sheet is provided with a sound-making member stacked by a plurality of ceramic material layers. A lead wire is welded to the sound-making member. The steel sheet is sandwiched between the upper drum paper and the lower drum paper. The upper drum paper is embedded in the inner edge of the frame-defining portion of the lower drum paper, and thus a thin loudspeaker is formed. After the sound-making member receives an audio signal, a sound is guided out through the upper drum paper and the lower drum paper.