CN87202554U - Dynamic damping electric loudspeaker - Google Patents

Abstract

The utility model relates to a dynamic damping electric loudspeaker, which belongs to the technical field of design and manufacture of loudspeakers. The upper part and the lower part of a voice ring skeleton are respectively wound with a damping ring of with both ends are in short-circuits. When the loudspeaker works around the resonance point of a vibrating system, the damping ring cuts magnetic force lines to generate damping action, so as to improve the impedance frequency characteristic and the output acoustic pressure of the loudspeaker and reduce non-linear distortion.

Description

Dynamic damping electric loudspeaker

The utility model belongs to speaker design manufacturing technology field.

Dynamic speaker vibrational system shown in Figure 1, its electromechanical analogy circuit such as Fig. 2, it is equivalent to a series resonance circuit, and its resonance frequency is (m ₁Be carton quality, m ₂Be voice coil loudspeaker voice coil quality, C ₁Be neck ring compliance, C ₂Be the latch plate compliance):

$f_m\mathrm{=\; 1\; /\; 2\; \pi }\sqrt{\mathrm{(m}{}_1\mathrm{+\; m}{}_2)\frac{c_1{c}_2}{c_1{\mathrm{+\; <figure-callout\; id="2"\; label="c"\; filenames="87202554\_DRIMG1.png"\; state="\{\{state\}\}">c</figure-callout>}}_2}}$

The resonance frequency of general dynamic speaker is approximately the hundreds of hertz.Dynamic speaker is when its vibrational system generation resonance and when being near the resonance frequency, and strong variation all takes place in the frequency response of its impedance frequency characteristic and output acoustic pressure, and supervenes very big nonlinear distortion.

The purpose of this utility model is to improve the frequency response and the impedance operator of dynamic speaker and reduce nonlinear distortion.

The method of " dynamic antivibration " that adopts the utility model suppresses the equivalent Qm value of the resonance of dynamic speaker vibrational system with reduction series resonance circuit, thereby realizes goal of the invention.Specific practice is as follows: voice coil loudspeaker voice coil is in magnetic gap center, on speech coil framework, is positioned at voice coil loudspeaker voice coil top and below (for the noninductive voice coil loudspeaker voice coil of many magnetic gaps magnetic circuit, below reaching above can be the voice coil loudspeaker voice coil section outside) respectively around a damped ring, and makes its two terminal shortcircuit.This damped ring quality should be as far as possible little, and the distance of it and voice coil loudspeaker voice coil requires selected according to damping.Generally speaking, damped ring is in outside the magnetic field, and when voice coil loudspeaker voice coil vibrated, damped ring was inoperative.And near the vibrational system resonance point time, amplitude increases greatly, makes damped ring enter magnetic gap.Because damped ring has cut on the magnetic line of force, the damped ring and produced back electromotive force, and damped ring is short circuit, the effect in its short circuit current and magnetic field will hinder the vibration of voice coil loudspeaker voice coil, form damping action.Amplitude is big more, and vibration velocity is big more, damping action is strong more, thereby is referred to as dynamic antivibration.

Dynamic antivibration can improve the impedance frequency characteristic of dynamic speaker and the frequency response of output acoustic pressure, and reduces the distortion of dynamic speaker.Dynamic antivibration both can be used for the dynamic speaker of widely used various magnetic structures at present, also can be used for the electric formula loud speaker of the noninductive voice coil loudspeaker voice coil of many magnetic gaps magnetic circuit.Dynamic antivibration and electric power feedback have some similarity, but simpler, practical than electric power feedback method.The electric power feedback is applied in some case.The dynamic antivibration dynamic speaker is used for closed sound case (because the appearance of Cushions formula loud speaker, airtight sound case use more and morely), characteristic that can also improvement sound case.

The drawing explanation:

Fig. 1 is the vibrational system of dynamic speaker.Wherein: 1, neck ring, its compliance C ₁, the friction R ₁2, cone, its quality m ₁3, latch plate, its compliance C ₂, the friction R ₂4 voice coil loudspeaker voice coils, its quality m ₂

Fig. 2 is a cone loudspeaker electromechanical analogy circuit.

Fig. 3 is embodiment.Wherein: 5, magnetic conduction train wheel bridge.6, magnetic conductive core column.7, permanent magnet.8, magnetic conduction lower plate.9,13, dynamic antivibration circle.10, speech coil framework.11,12, noninductive voice coil loudspeaker voice coil two sections.

Embodiment.See Fig. 3, top and below in two magnetic gap magnetic circuits noninductive voice coil loudspeaker voice coil dynamic speaker voice coil loudspeaker voice coil sections (11) and (12), each around a damped ring (9) and (13), and makes damped ring two terminal shortcircuits with aluminium foil.

Claims (3)

1, a kind of dynamic speaker is characterized in that, is positioned at the above and below of voice coil loudspeaker voice coil on speech coil framework, respectively around a damped ring, and makes its two terminal shortcircuit.

2, loud speaker as claimed in claim 1 is characterized in that, the aluminium foil coiling of said damped ring.

3, loud speaker as claimed in claim 2 is characterized in that, it both can be the dynamic speaker of common magnetic path structure, also can be the dynamic speaker of the noninductive voice coil loudspeaker voice coil of many magnetic gaps magnetic circuit.

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