Thin type electrodynamic loudspeaker

Abstract

The invention relates to a thin type electrodynamic loudspeaker. The loudspeaker comprises a speaker frame, and a magnetic circuit structure, a positioning support chip and a voice cone which are installed in the speaker frame, wherein the speaker frame is provided with a wiring board. The loudspeaker is characterized in that the magnetic circuit structure comprises a U-shaped magnetic conducting yoke, a magnet, a magnetic pole core and a voice coil, wherein the U-shaped magnetic conducting yoke is arranged in the speaker frame, and the outer bottom surface of the U-shaped magnetic conducting yoke is tightly combined with the upper bottom surface of the speaker frame; the magnet and the magnetic pole core are installed in the U-shaped magnetic conducting yoke, the lower surface of the magnet is tightly combined with the inner surface at the bottom of the U-shaped magnetic conducting yoke, and the upper surface of the magnet is tightly combined with the magnetic pole core; the voice coil is wound around the magnet and the magnetic pole core, a space is reserved between the inner wall of the voice coil and the outer wall of the magnetic pole core, and a space is also reserved between the outer wall of the voice coil and the inner wall of the U-shaped magnetic conducting yoke. The invention has the advantages of artful structure, compactness and reasonableness, optimizes the thickness while not decreasing the magnetic flux and the BL value, and can not produce excessive heat energy, thereby ensuring the acoustic performance and the reliability of the loudspeaker.

Description

technical field [0001] The invention belongs to the field of electroacoustic technology, and relates to a loudspeaker, in particular to a thin electric loudspeaker. Background technique [0002] In the prior art, speakers used in LCD, PDP and other flat-panel video equipment generally adopt the structure of a funnel-shaped sound basin and a positioning support piece, and a center hole is opened in the center of the funnel-shaped sound basin, and the positioning of the center hole is also provided. The support piece is set under the sound cone, the voice coil runs through the center hole of the sound cone and the positioning support piece, the outer wall of the voice coil is closely combined with the sound cone and the inner wall of the center hole of the positioning support piece, thus forming the vibration system of the speaker; while the conventional The magnetic circuit structure of the general is that the magnet is placed in the center, and the magnet is surrounded by a ...

AI Technical Summary

Problems solved by technology

However, this open magnetic circuit structure without the magnetic yoke has the defects of uneven magnetic field distribution and too fast attenuation on both sides of the positive magnetic field. The speaker using this magnetic circuit structure has large distortion and serious magnetic flux leakage. Part of the coil enters the reverse magnetic field area, which increases the negative impedance effect of the voice coil, resulting in excessive voice coil current, and the voice coil is prone to heat, which affects the reliability of the speaker.

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