SU1275791A1 - Dynamic loudspeaker - Google Patents

Abstract

The invention relates to electroacoustics and allows for an increase in the quality of sniffing by reducing the resonant frequency, nonlinear distortion and quality factor. The mobile system of the device consists of a diffuser 1, made with flared 2, located parallel to the opposite section of the diffuser 10, centering washer 3. Combining the center of the plane of attachment to the diffuser with the center of gravity of the moving system increases the moment of forces centering this system. The gap size i between the flanging 2 and the inner surface of the diffuser 10 is selected from the condition of obtaining the necessary acoustic impedance, providing a slight shunting effect of the gap. 1 il. ate with

Description

This invention relates to electro-acoustics, in particular to the design of wide-band diffuser dynamic loudspeakers. The aim of the invention is to improve the sound quality of a loudspeaker by reducing the resonant frequency, reducing the magnitude of the nonlinear distortion and Q-factor. The drawing shows the proposed loudspeaker. The loudspeaker contains a moving system consisting of diffuser 1 with flare 2, centering washer 3, voice coil 4, which is located in the gap of the magnetic circuit formed by the core 5 and the upper flange 6 and filled with magnetic fluid 7, the magnetic circuit also contains magHRT 8 placed between the upper 6 and 20 lower 9 flanges of the magnetic circuit. The movable system and the magnetic circuit are mounted on the diffuser 10, (the upper edge of which is articulated with the front wall of the housing 11. In addition, in order to reduce the dimensions, the loudspeaker can be equipped with an additional ring 12 placed coaxially with flanging but having a radius smaller than the inner radius flanging to the width b of the slit formed by the flanging and the inner surface of the diffuser holding coaxial with respect to it 13. Also flanking 2 can be used to reduce the dimensions of the loudspeaker Be directed in the direction opposite to the direction of emission of the loudspeaker.

 The center of the gluing plane of the centering washer coincides with the center of gravity of the movable body of the loudspeaker system. In this case, the best centering effect is achieved by increasing the moment of forces centering the moving system, the voice coil of which is located in the gap of the magnetic circuit filled with magnetic fluid.

The size of the slit is determined from the condition of obtaining the required acoustic impedance, which is determined from the ratio

0 4i (. + Ju) pB),

62

ab le; shu; not ti fy for ara dg mou: note fayuyut 40

d is the diameter of a circle in area, equal to the area of the slit; D is the diameter of the outer edge

diffuser; fg - resonant frequency

oscillatory system. we are formed by the acoustic mass of air in the gap and the acoustic elasticity of the air volume inside the speaker system.

Claims (1)

In order to obtain an effective de-phase-inverse acoustic system, the resonant frequency should be air visibility, air density, b, c, a - width, depth and slot length (peripheral), with a 1 (1), where D is the outer diameter of the diffuser, 2TTf, where f - frequency. The magnitude of the acoustic impedance Z., so that there is no significant puncturing action, must be less than 3 times the acoustic resistance of the radiation of the diffusion Z of the loudspeaker j which is a closed speaker system clearly 2TIP Z) H Vfftff 3. jcxKP. 4Т1с for an open system Р е S the effective surface area of the diffuser, с - the speed of sound. In the case of using the proposed loudspeaker design in a zoinversion system, in which the slot waiting for the diffuser and diffuser, plays the role of the mass inverter element, the slot dimensions are determined from the 4B + 3j 4d -, 52 ratio from the resonant frequency of the mobile system within ± 2/3 octaves . Otherwise, the reproduction of low frequencies is impaired. The correct choice of slot sizes ensures that the loudspeaker thunder in the low-frequency region will work efficiently, since due to the rejection of the suspension, the resonant frequency will be significantly reduced. The value of the quality factor is also reduced due to the fact that it is proportional to the resonant frequency. Decreasing the Q-factor entails an increase in the uniformity of the frequency response. Thus, the proposed loudspeaker design improves the quality of the loudspeaker, namely: reduces the resonance frequency, thereby expanding the range towards low frequencies while maintaining the dimensions of the loudspeaker; reduces the quality factor, which increases the uniformity of the frequency response; reduces harmonic distortion and improves voice coil alignment. DETAILED DESCRIPTION Dynamic loudspeaker, comprising a housing, a moving system consisting of a diffuser, a centering washer, a voice coil, a magnetic circuit filled with magnetic fluid in a gap, characterized in that, in order to increase the sound quality by reducing the resonant frequency, non-linear distortions and the quality factor, the diffuser is made with flared, located parallel to the opposite portion of the diffuser, with the value between the flanging and the inner surface of the diffusor rzhatel formed to satisfy the relation Tsey. aKdnqiOp where Z, the acoustic resistance of the gap between the flare and the inner surface of the diffuser, the acoustic resistance K.-diffusion of the diffuser radiation, and the center of the gluing plane of the centering washer to the diffuser are aligned with the center of gravity of the moving system.