CN201854402U

CN201854402U - Low-frequency passive radiator

Info

Publication number: CN201854402U
Application number: CN2010202727554U
Authority: CN
Inventors: 董建兵
Original assignee: Beijing Edifier Technology Co Ltd
Current assignee: Beijing Edifier Technology Co Ltd
Priority date: 2010-07-28
Filing date: 2010-07-28
Publication date: 2011-06-01
Anticipated expiration: 2020-07-28

Abstract

The utility model provides a low-frequency passive radiator which comprises a counterweight and an integral vibration diaphragm, wherein the vibration diaphragm integrates a corrugated rim and a vibration plate (basin), the periphery of the vibration diaphragm is in an arc-shaped structure, the interior of the vibration diaphragm is in a plane or a basin-shaped structure, and the arc-shaped part is in a protruded shape, indent shape or other shapes. When the interior of the vibration diaphragm is a plane, the counterweight can be stuck on the upper surface or the lower surface of the plane. When the interior of the vibration diaphragm is in the indent basin shape, the basin-shaped structure can be coated with one layer of glue material so as to reach the counterweight effect. The corrugated rim structure at the periphery of the vibration diaphragm can be in a circular, oval or runway shape. The vibration diaphragm can be made of paper, cloth, foam, rubber or thermoplastic material. The low-frequency passive radiator has simple structure, is simple and convenient to install, easy to manufacture and has low cost, can improve the bass effect and is beneficial to the large-scale production and application.

Description

A kind of low frequency passive radiator

Technical field

The utility model relates to a kind of low frequency passive radiator, relates in particular to a kind of low frequency passive radiator that is applied on the airtight casing.

Background technology

For mini audio amplifier, because the restriction of volume, the loud speaker that uses can not be too big, the general loud speaker that all uses below 2 inches or 2 inches, cause its vibration effective area corresponding less, and the quality of vibrating diaphragm is also less relatively, thereby its low-frequency resonant frequency is higher, so just caused the shortage of mini audio amplifier bass.

At present, the main mode that addresses this problem is by phase-reversing tube or low frequency passive radiator.

Phase-reversing tube is exactly one section hollow pipe in fact, makes with the PVC material usually, also has plenty of metal tube or cardboard tube.Phase-reversing tube communicates with extraneous space by an outlet of audio amplifier front panel or postnotum, and that outlet is exactly a paraphase hole.Vibrating diaphragm in porpoise, except will be outside the radiative acoustic wave of the place ahead (the case), also can be, and paraphase hole can discharge the low-frequency sound wave that is radiated in the case again towards radiative acoustic wave in the case.Because the sound wave phase place of radiation is just in time opposite before and after the vibrating diaphragm, if directly release, total low frequency energy not only can not be strengthened, and can be cancelled weakening on the contrary.So must put upside down the sound wave phase place that is radiated in the case more once, promptly anti-turnback, so and the sound wave homophase of forward radiation.

It is internally-damped too small that but its shortcoming is audio amplifier, and the influence of paraphase hole or phase-reversing tube viscous damping is more serious, makes that its low frequency definition is relatively poor.Usually use passive radiator to replace phase-reversing tube in order to regulate than the tonequality of small box and to make it have better bass performance.

The low frequency passive radiator does not have magnetic circuit and voice coil loudspeaker voice coil, and the motion of vibrating diaphragm is leaned on the promotion of air-flow in the casing and carried out.As shown in Figure 1,3 is airtight casing, the 2nd, and active loudspeaker unit, the 1st, low frequency passive radiator.Because low frequency passive radiator 1 and active loudspeaker unit 2 are mounted in the casing 3 of sealing, like this, when the active speaker operation is sounded, the motion of its vibrating diaphragm, can cause air in the casing 3 to be compressed and expand, under the effect of air pressure change, passive vibrating diaphragm produces vibration, promote the air outside the casing 3, so just can sound.By the adjusting of different counterweights, the low frequency passive radiator can resonate on different frequency.

Nineteen thirty-five American Mancur Olson has been invented low frequency passive radiation audio amplifier, and U.S. JBL, Inc. is through improving the low frequency passive radiator of having released modified form again thereafter, and its structure as shown in Figure 2.It has conical diaphragm 13, counterweight 16 and dust cap 14.Support component be by ring 12 and decide that core props up that sheet 15 constitutes the dual-element system.Ring 12 plays sealing, support and support; Dust cap 14 can prevent dust again as its oscillating action of a part of vibrating diaphragm simultaneously.This structure has the bathtub construction framework 11 the same with common electrical dynamic formula loud speaker, and the volume that seems is excessive; And its complex structure, price are also quite expensive, are not suitable for using in mini audio amplifier.

More and more low frequency passive radiator structures that begin to use as shown in Figure 3 in mini audio amplifier.The 21st, ring; 22 is oscillating plate; 23 is counterweight.The edge of the edge of ring 21 and oscillating plate 22 is glued together, and forms an airtight space with casing 3.Usually with metallic plate or the bigger material of cardboard isodensity, volume is little but to increase the bass radiation intensity to counterweight, produces strong and powerful, mellow and full bass.By the adjusting of different counterweights, the low frequency passive radiator can resonate on different frequency

Though the low frequency passive radiator of this structure is widely used, because ring edge and oscillating plate edge need be bonded together, and this edge bonding mode difficulty is higher relatively, causes gas leak phenomenon easily, brings noise, influences bass effect; And in the course of processing of ring, need cut it, this is to a certain degree causing raw-material waste, has increased production process again simultaneously, is not the preferred plan that is fit to large-scale industrial production.

Summary of the invention

In order to overcome the deficiency of prior art on producing, and lifting bass effect, the utility model proposes a kind of low frequency passive radiator, comprise counterweight and an integral type vibrating diaphragm, described integral type vibrating diaphragm is integrated with ring and oscillating plate (basin): described vibrating diaphragm periphery is an arcuate structure, and inside is plane or bathtub construction.Arch section is generally projection, indent or other shapes, when vibrating diaphragm is inner when being the plane, described counterweight can stick on the top of described plane or below; When vibrating diaphragm inside is the basin shape of indent, can be coated with one deck colloidal material on bathtub construction to reach the effect of counterweight.The ring formula structure of described vibrating diaphragm periphery can be circle, ellipse or runway shape.Described vibrating diaphragm can be made with paper, cloth, foam (Foam), rubber or thermoplastic material.

The utility model is simple in structure, simple installation, makes easily, with low cost, and can reach best bass effect, is beneficial to large-scale industrial production and uses.

Other features and advantages of the utility model will be set forth in the following description, perhaps understand by implementing the utility model.The purpose of this utility model and other advantages can realize and obtain by specifically noted structure and method in the specification of being write, claims and accompanying drawing.

Introduce preferred embodiment below in conjunction with accompanying drawing, the device that the utility model proposes is described in detail.Should be noted that the purpose of accompanying drawing just is convenient to the explanation to the utility model specific embodiment, is not a kind of unnecessary narration or to the restriction of the utility model scope.

Description of drawings

Fig. 1 is mini loudspeaker box structure figure.

Fig. 2 is a kind of taper low frequency passive radiator structure figure used in the prior art.

Fig. 3 is another kind of low frequency passive radiator structure figure used in the prior art.

Fig. 4 (a) is the cutaway view of the low frequency passive radiator that the utility model adopted.

Fig. 4 (b) is the vertical view of the low frequency passive radiator that the utility model adopted.

Fig. 5 is the diaphragm structure figure that the utility model adopted.

Fig. 6 is an application structure figure of the present utility model.

Embodiment

Be depicted as the cutaway view of a kind of low frequency passive radiator that the utility model adopts as Fig. 4 (a), Fig. 4 (b) is a vertical view.Low frequency passive radiator of the present utility model is made up of vibrating diaphragm 31 and counterweight 32.Usually in the process of using, vibrating diaphragm 31 will be bonded together with casing 3, forms a confined space.

The periphery of vibrating diaphragm 31 is the ring structure, for example projection or indent, and from vertical view, it can be circular, ellipse or runway shape.The inside of vibrating diaphragm 31 can be plane or bathtub construction.Fig. 5 has listed several diaphragm structures, and (1), (2), (3) and (4) are the cutaway view of vibrating diaphragm, and (5) and (6) are the vertical view of vibrating diaphragm.Vibrating diaphragm 31 can be made with paper, cloth, foam (Foam), rubber or thermoplastic material.This material is a high damping material, is bonded together with counterweight, can absorb the metallic sound that forms owing to the counterweight vibration, to reach better bass effect.Need to prove, when adopting the basin shape diaphragm structure of (2) or (4), need usually to cooperate special closed box body structure to realize bass effect, as adopting the labyrinth type body structure.

Shown in Fig. 4 (a), in the present embodiment, the peripheral ring of vibrating diaphragm 31 partly adopts bulge-structure, and makes runway shape, the level and smooth planar structure of inner employing, and counterweight 32 is bonded in below the plane.The size of this bossing is relevant with the vibration displacement of radiator, through reasonably design, can improve the maximum linear displacement and the damping characteristic of radiator.

Vibrating diaphragm in this utility model plays the effect of ring and oscillating plate (basin) simultaneously, because vibrating diaphragm is as a whole, need not be as prior art with inside cutting, remainder as ring, and with gluing being integral in edge of its edge and an oscillating plate (basin), therefore can guarantee better air-tightness, simultaneously can reduce production process again, economical with materials reduces cost, the convenient installation, this has positive meaning for boosting productivity.Simultaneously, if adopt the structure shown in Fig. 4 (a), because counterweight mostly is the bigger metal material of density and makes, it is stronger to the radianting capacity of high-frequency signal, and vibrating diaphragm is a high damping material, and be bonded together with counterweight, can absorb the high-frequency signal that radiate because of counterweight, to reach better bass effect.At present, the low frequency passive radiator of this structure has been applied to facts have proved in the inventor's the industrial production that its bass effect also is greatly improved than prior art.

Usually, the low frequency passive radiator elements all is together to be sealed in the casing with the active loudspeaker unit.The number of the two can be set according to real needs.As shown in Figure 6, we in the present embodiment, what select for use is 1 low frequency passive radiator, 2 initiatively loudspeaker units are respectively put in its both sides.This system shows as in the actual sound quality evaluation: low frequency is clean, well arranged, the amount sense is pure.

The above only is a preferred implementation of the present utility model, but they are not the limitations of the utility model scope.Should be pointed out that for those skilled in the art under the prerequisite that does not break away from the utility model principle, some improvements and modifications of having done also should be considered as within the protection range of the present utility model.

Claims

1. a low frequency passive radiator comprises counterweight, it is characterized in that, also comprises an integral type vibrating diaphragm, and described vibrating diaphragm periphery is an arcuate structure, and inside is plane or bathtub construction.

2. device according to claim 1 is characterized in that, described counterweight can stick on the top of described planar structure or below.

3. device according to claim 1 is characterized in that, described counterweight can be gluey coating, and is coated on the described bathtub construction.

4. device according to claim 1 is characterized in that, the arcuate structure of described vibrating diaphragm periphery can be circle, ellipse or runway shape.

5. device according to claim 1 is characterized in that, described vibrating diaphragm can be made with paper, cloth, foam, rubber or thermoplastic material.