CN109391886B

CN109391886B - Passive radiator

Info

Publication number: CN109391886B
Application number: CN201811302954.2A
Authority: CN
Inventors: 王远昌; 刘志雄
Original assignee: Shenzhen 3Nod Digital Technology Co Ltd
Current assignee: Shenzhen 3Nod Digital Technology Co Ltd
Priority date: 2018-11-02
Filing date: 2018-11-02
Publication date: 2024-04-02
Anticipated expiration: 2038-11-02
Also published as: CN109391886A

Abstract

The embodiment of the application belongs to the field of audio frequency and relates to a passive radiator applied to a loudspeaker. The passive radiator is arranged in the sound box and comprises a vibrating diaphragm and a motion system, wherein the motion system is of a symmetrical structure and is provided with a central axis and comprises a fixed bracket and a connecting element; the fixed bracket is fixed on the sound box and is provided with a hollow interior; the vibrating diaphragm is fixed on the connecting element; the connecting element drives the vibrating diaphragm to move in the hollow interior of the fixed support, and the gravity center position of the vibrating diaphragm coincides with the central axis of the motion system. According to the technical scheme, the distortion of sound pressure caused by the asymmetry of the air quantity discharged from the edge of the folded ring in the prior art can be improved.

Description

Passive radiator

Technical Field

The present application relates to the field of audio, and more particularly to passive radiators for use on speakers.

Background

Passive radiator, namely passive radiator, hollow cone, passive diaphragm, etc., which are described as things, the passive radiator is the same as the common bass unit in appearance; but its structure is quite different from the internal view. No leads are attached to the top, and the back side is free of conventional drive magnets. Namely, only the folding ring and the vibrating diaphragm can move by itself under the pushing of air without power supply driving.

Sound boxes using "passive radiators" typically comprise one electrically driven active speaker unit and one passive unit (passive radiator). The air in the sound box is compressed or relaxed along with the vibration of the active speaker unit when the sound box is arranged in a sealed sound box (the inside of the sound box is not directly communicated with the atmosphere), so that the passive radiator is driven to generate corresponding vibration by the movement of the air, and the passive radiator can generate sound without a power supply.

The working principle is that the loudspeaker box with the passive radiator can push more air in one-time operation, the passive radiator is generally larger than the loudspeaker in area, the loudspeaker box has better bass submergence, and the principle is that the passive radiator can enhance the bass of the loudspeaker box, so that the small box body can obtain better bass effect. In this regard, the passive radiator does not function little.

The passive radiator is driven by the active unit in the sound box to passively sound under the driving of air in the box. Passive radiators are typically used to tune the bass sound so that the designer can tune the overall tone of the cabinet. The attenuation frequency of a passive radiator is typically reduced by 18db per octave. Therefore, the loudspeaker can be designed to carry out resonance sounding at the submergence depth which is not reached by the bass unit of the loudspeaker, and meanwhile, no obvious 'gear break' appears between the sounding frequency of the bass unit and the sounding frequency of the passive radiator, so that a smooth audio curve is generated from high to low. The paper tray of the bass unit and the paper tray of the passive radiator may be moved simultaneously inward or outward (this is referred to as "in phase"), or a combination of opposite movements.

The folded ring is used as an indispensable part in the passive radiator, and not only supports and keeps the movement of the vibrating diaphragm, but also enables the vibrating diaphragm to vibrate freely along the axial direction. The shape of the folding ring is various, and the corrugated folding ring and the half ring type folding ring are commonly used at present. The curled edges of the folded ring have different volumes of air in the vertical amplitude direction, so that the sound radiated by the folded ring still comprises distortion terms even if the supporting force is linear.

As shown in fig. 1, the edge of the diaphragm 150 has a convex folder 151, and the diaphragm 150 is fixed to a case 152 thereof by the convex folder 151. It is assumed here that the diaphragm 150 is linearly vibrating, i.e., vibrating back and forth an equal distance (Xmm). The amount of air discharged is denoted by U1 when the diaphragm 150 is forward X mm, and by U2 when the diaphragm 150 is backward X mm. In this case, as shown in the drawing, the air amount U1 and the air amount U2 are different from each other due to the deformation of the convex folding ring 151. The asymmetry of the air volume discharged by the edge causes distortion of the sound pressure.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present application is to improve the problem of distortion of sound pressure caused by asymmetry of the air amount discharged from the edge of the folded ring in the prior art.

In order to solve the above technical problems, the passive radiator according to the embodiments of the present invention adopts the following technical solutions:

the utility model provides a passive radiator sets up in the audio amplifier, and it includes vibrating diaphragm and motion system, its characterized in that:

the motion system is of a symmetrical structure and is provided with a central axis, and comprises a fixed bracket and a connecting element;

the fixed bracket is fixed on the sound box and is provided with a hollow interior;

the vibrating diaphragm is fixed on the connecting element;

the connecting element drives the vibrating diaphragm to move in the hollow interior of the fixed support, and the gravity center position of the vibrating diaphragm coincides with the central axis of the motion system.

Further, the fixed support is provided with an annular side wall, the outer end face of the side wall is fixed on the sound box, and the fixed support further comprises a track groove, and the track groove is inwards recessed from the inner end face of the side wall of the fixed support.

Further, a buffer element is arranged in the track groove.

Further, the buffer element is composed of an elastic medium.

Further, the elastic medium material is graphene aerogel.

Further, the connecting element has a first boss that mates with the fixed bracket track slot.

Further, the connecting element is further provided with a second boss for fixing the vibrating diaphragm.

Further, the connecting element is further provided with a groove matched with the inner wall of the track groove of the fixed support, and the groove is arranged between the first boss and the second boss.

Further, the method comprises the following steps. The motion system can be in a symmetrical structure such as a round structure, a rectangular structure, a runway type structure and the like.

Further, the fixing support is provided with a step and is fixed on the sound box through the step.

Compared with the prior art, the embodiment of the application has the following main beneficial effects: because of this passive radiator of embodiment its includes vibrating diaphragm and moving system, and its moving system is symmetrical structure, has the axis, including fixed bolster and connecting element, can drive the reciprocating motion of vibrating diaphragm in operating system through connecting element to avoid the vibrating diaphragm to produce deformation, make the air quantity in the audio amplifier can not change, can effectively improve the asymmetric distortion that leads to the acoustic pressure of the air quantity of ring edge exhaust among the prior art.

Drawings

For a clearer description of the solution of the present application, a brief description will be given below of the drawings that are needed in the description of the embodiments, it being obvious that the drawings in the description below are some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a diagram illustrating a deformation of a diaphragm gimbal of a prior art passive radiator.

Fig. 2 is a front view and a cross-sectional view of a passive radiator according to an embodiment of the present invention.

Fig. 3 is an exploded view of a passive radiator according to an embodiment of the present invention.

Fig. 4 is a cross-sectional partial enlarged view of a passive radiator according to an embodiment of the present invention.

Fig. 5 is a motion trajectory diagram of a passive radiator according to an embodiment of the present invention.

Fig. 6 is a rigid linear comparison diagram of a passive radiator according to an embodiment of the present invention and a conventional passive radiator structure.

Reference numerals:

100-sound box main body, 200-loudspeaker and 300-passive radiator

1-fixed support, 2-buffer element, 3-vibrating diaphragm, 4-connecting piece.

11-fixed support steps, 12-fixed support track grooves and 13-fixed support inner walls

41-first boss of the connecting element, 42-recess of the connecting element, 43-second boss of the connecting element.

Description of the embodiments

In order to better understand the technical solutions of the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

The novel passive radiator sound box provided by the invention, as shown in fig. 2, comprises a sound box main body 100, a loudspeaker 200 and a passive radiator 300, wherein the loudspeaker 200 and the passive radiator 300 are arranged on a front panel of the sound box main body 100, the loudspeaker 200 is positioned above, and the passive radiator 300 is positioned below and symmetrically arranged along a central axis X-X of the front panel.

As shown in fig. 3, a passive radiator 300, which includes a diaphragm 3 and a moving system.

The motion system is of a symmetrical structure and is provided with a central axis, and comprises a fixed bracket 1 and a connecting element 4;

the fixed bracket 1 is fixed on the sound box main body 100 and is provided with a hollow interior;

the diaphragm 3 is fixed on the connecting element 4;

the connecting element 4 drives the vibrating diaphragm 3 to move in the hollow interior of the fixed support 1, and the gravity center position of the vibrating diaphragm 3 coincides with the central axis of the motion system.

The fixed support 1 is approximately annular, hollow inside and provided with a circular side wall, the outer end face of the side wall is provided with a step 11 (figure 4), the fixed support 1 is directly embedded into the sound box main body 100 through the step 11, other connecting pieces are not needed, and the assembly is easy. The end of the fixed bracket 1, which is far away from the step 11, is an inner end surface, and a track groove 12 is recessed inwards along the inner end surface.

In the embodiment of the invention, the fixing support 1 is a runway, namely, the edge is divided into four edge sections along the outer circumferential direction, and two sections of arcs and two straight lines form. In other embodiments of the present invention, the fixing bracket 1 may be mainly symmetrical along the axial direction, and may be rectangular, circular, etc. without being limited by the shape and the number of divided segments. Due to the symmetrical arrangement, the vibrating diaphragm is stressed uniformly when moving, and the change of the air quantity in the sound box is symmetrical, so that the distortion of bass is avoided.

As shown in fig. 4, wherein the passive radiator 300 further comprises a buffer element 2.

The shape of the buffer element 2 is substantially the same as the shape of the track groove 12 of the fixing bracket 1, and is used for being embedded in the track groove 12 inside the fixing bracket 1, and the material of the buffer element 2 is an elastic material.

As a preferred scheme of the embodiment of the invention, the buffer element 2 is made of graphene aerogel, and the graphene aerogel is prepared by a method of supporting nanocellulose nanocrystallines (CNCs) and performing welding action on an external carbon source, and has high compression and super-elastic properties. The aerogel with low density and stable structure can be constructed through the nano supporting function of CNC, and the acting force between rGO is enhanced through the carbon welding function of CNC and a small molecular carbon source, so that a flexible wavy carbon layer structure with higher continuity and better shape memory performance is formed. Graphene aerogel has ultrahigh compressibility (99% and the limit of material compressibility is equivalent to complete compression), and has elasticity and fatigue resistance (the height is not obviously reduced after 10000 times of cyclic compression); in other embodiments of the present invention, the cushioning element 2 may be made of other elastic materials, which are not set in this embodiment.

Referring to fig. 3, the connecting element 4 is a ring-shaped structure similar to the fixing bracket 1, and referring to fig. 4, the cross section of the connecting element 4 is a concave structure, and includes a first boss 41, a groove 42 and a second boss 43, where the groove is disposed between the first boss 41 and the second boss 43. Wherein the first boss 41 is wider and thicker and the second boss 43 is narrower and thinner. The width of the boss 41 is substantially the same as the width of the rail groove 12 of the fixing bracket 1 for a sliding fit, enabling the first boss to be moved in said rail groove 12, and the inner wall 13 of the fixing bracket 1 is inserted into the recess 42 of the connecting element 4 for a sliding fit, ensuring that the connecting element 4 is moved along the rail groove in the rail groove 12 of the fixing bracket 1.

The vibrating diaphragm 3 is arranged in the hollow of the fixed support 1 and is far away from one side of the step 11, and the vibrating diaphragm 3 and the connecting element 4 are fixedly arranged. In the embodiment of the invention, the diaphragm 3 is fixedly arranged on the second boss 43 of the connecting element 4. The shape of the vibrating diaphragm of the passive radiator can be any symmetrical shape such as a circle, a rectangle, a runway and the like.

As shown in fig. 5, when the connecting element 4 vibrates along the moving direction of the track groove 12 of the fixed bracket 1 to the outside of the sound box main body 100, the connecting element 4 is driven to squeeze the buffer element 2, so that the vibrating diaphragm 3 keeps moving forward in the axial direction; when the diaphragm 3 vibrates along the moving horizontal direction of the fixed support rail groove 12 to the inside of the sound box main body 100, the connecting element 4 is driven to stretch the buffer element 2, so that the diaphragm 3 keeps moving backwards in the axial direction, and the passive radiator 300 drives the diaphragm to reciprocate, so that the air change of the sound box is linear, and the distortion of sound pressure caused by the asymmetry of the air quantity discharged from the edge of the folded ring in the prior art can be effectively improved, as shown in fig. 6.

It is apparent that the embodiments described above are only some embodiments of the present application, but not all embodiments, the preferred embodiments of the present application are given in the drawings, but not limiting the patent scope of the present application. This application may be embodied in many different forms, but rather, embodiments are provided in order to provide a more thorough understanding of the present disclosure. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing, or equivalents may be substituted for elements thereof. All equivalent structures made by the specification and the drawings of the application are directly or indirectly applied to other related technical fields, and are also within the protection scope of the application.

Claims

1. The utility model provides a passive radiator sets up in the audio amplifier, and it includes vibrating diaphragm and motion system, its characterized in that:

the vibrating diaphragm is fixed on the connecting element;

the connecting element drives the vibrating diaphragm to move in the hollow interior of the fixed support, and the gravity center position of the vibrating diaphragm coincides with the central axis of the motion system;

the fixed support is provided with an annular side wall, the outer end face of the side wall is fixed on the sound box, a track groove is recessed inwards at the inner end face of the side wall of the fixed support, and the connecting element is provided with a first boss which is in sliding fit with the track groove of the fixed support;

the track groove is provided with a buffer element.

2. The passive radiator of claim 1, wherein: the cushioning element is composed of an elastic medium.

3. A passive radiator as claimed in claim 2, characterized in that: the elastic medium material is graphene aerogel.

4. A passive radiator according to claim 3, characterized in that: the connecting element is also provided with a second boss for fixing the vibrating diaphragm.

5. The passive radiator of claim 4, wherein: the connecting element is also provided with a groove which is in sliding fit with the inner wall of the fixed support rail groove, and the groove is arranged between the first boss and the second boss.

6. The passive radiator of claim 1, wherein: the motion system is round, rectangular or runway type.

7. The passive radiator of claim 1, wherein: the outer end face of the fixed support is a step, and the fixed support is fixed on the sound box through the step.