A miniature dual-drive broadband car sounder

Abstract

The invention relates to a miniature dual-drive broadband signal sounder of an automobile. The miniature dual-drive broadband signal sounder comprises two drivers. The two drivers share a bottom board and a plastic housing arranged on the bottom board, two cavities which are bilaterally symmetrical with each other are formed between the bottom board and the plastic housing, circuit boards, iron cores, coils, magnetic rings, membranes and mass slices are arranged in the cavities, the iron cores are arranged on the circuit boards, the coils are wound on the iron cores, the magnetic rings are arranged on the iron cores, the membranes are supported by the magnetic rings, the mass slices are arranged on the membranes, front cavities are formed between the plastic housing and the membranes, inner cavities are formed between the membranes and the iron cores, rear cavities are formed between the circuit boards and the bottom board, through holes are formed in the iron cores and the circuit boards, the inner cavities are communicated with the rear cavities via the through holes, and two sound production holes which are bilaterally symmetrical with each other are formed in the center of the upper wall of the plastic housing. The miniature dual-drive broadband signal sounder has the advantages that the miniature dual-drive broadband signal sounder is provided with the two drivers, the rear cavities are communicated with the inner cavities, accordingly, different frequencies can be generated by the signal sounder, the response frequency range of the signal sounder can be greatly broadened, the sound production efficiency of the signal sounder can be greatly improved, the transmitted sound volume of the signal sounder can be greatly increased, and the service range of the signal sounder can be extended.

Description

technical field

[0001] The invention relates to the technical field of sounders, in particular to a miniature double-drive broadband car sounder. Background technique

[0002] The car broadband sounder can be applied to the car instrument and the car backup alarm. see figure 1 , the traditional automotive broadband sounder includes a plastic case 1' with an unclosed bottom, epoxy resin 2' poured into the bottom of the plastic case, the upper part of the epoxy resin is concave, and a circuit board 3' is placed in the concave place, and an iron core 4 is set on the circuit board ', a coil 5' is wound on the iron core, and a magnetic ring 6' with a certain distance from the coil is arranged on the iron core, a vibrating diaphragm 7' is arranged on the magnetic ring, and a mass plate 8' is arranged on the vibrating diaphragm. The sounder with the above structure has small internal space, few available frequencies, and poor sense of hearing. In addition, due to the increasingly...

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