Magnetic shielding device and magnetic shielding method of earphone circuit board

Abstract

The invention discloses a magnetic shielding device and a magnetic shielding method of an earphone circuit board and relates to the technical field of an active earphone. The magnetic shielding device of the earphone circuit board comprises a shielding cover which is arranged between a horn of the earphone and the circuit board. An opening end of the shielding cover is combined on the circuit board. The shielding cover is made of permeability magnetic materials. The magnetic shielding method of the earphone circuit board includes the steps: S1, providing the shielding cover which is made of permeability magnetic materials; S2, combing the opening end of the shield cover with the circuit board of the earphone. A magnetic line of force which is produced by the circuit board in the magnetic field passes the shielding cover and returns to the other end of the magnetic field so interference on an earphone horn is reduced. The magnetic shielding device and the method of an earphone circuit board solve the technical problem that the magnetic field which is produced by the circuit board in the inner portion of the earphone in the prior art produces interference on the horn. The magnetic shielding device of the earphone circuit board is simple in structure, reduces interference of an inductance element which is arranged on the circuit board in the inner portion of the earphone on the horn in a space where the earphone is limited, reduces noise of the horn and improves tone quality and quality of the earphone.

Description

technical field [0001] The invention relates to the technical field of active earphones, in particular to a circuit board magnetic shielding device and method for active earphones. Background technique [0002] Earphones are personal audio equipment, which can be divided into active earphones and passive earphones based on the sound source. Active earphones mainly include relatively arranged circuit boards and speakers. As we all know, if the speaker of the earphone is disturbed, noise will be generated, which seriously affects the sound quality of the earphone. [0003] At present, those skilled in the art have adopted a variety of shielding methods for the interference of earphones, but most of them are aimed at the electrostatic interference or electromagnetic radiation problems generated by electronic products connected to the earphones, and are all adopted for the interference outside the earphones. These measures have almost no effect on the interference of the magnet...

AI Technical Summary

Problems solved by technology

Those skilled in the art have never discovered the problem that the internal circuit of the earphone will interfere with the speaker. figure 1 Let me explain the interference principle of the earphone internal circuit to the speaker: there are many inductive elements 3 on the earphone circuit board 2, and these inductive elements 3 will generate low-frequency changing magnetic fields. The magnetic force line 4 will be coupled to the speaker 1, thereby causing interference to the speaker 1, and the sound from the speaker 1 will be noisy, which will affect the sound quality of the earphone and reduce the quality of the earphone

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