JPH11215593A - Structure of loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the structure of a loudspeaker where viscosity resistance of air that is substantial to a conventional double damper or a multiple damper is excluded and linearity of a vibration system, while driving is ensured even with high input and high amplitude. SOLUTION: This loudspeaker adopts a multiple damper where a vibration system 10 is supported by two dampers or more. One damper 11 of the multiple damper employs a damper material made of a woven cloth by twist knitting where each of warps 1 Mv and wefts 1 Mh consists of two twines or over, either of the warp and weft enters the twist of the other at a cross point 1 Mx of the warp and weft and they are knitted as a net. A thermosetting resin such as phenol resin is impregnated to the damper material, and a concentric waveform corrugation is integrally formed by a forming means, such as a thermal forming processing to form the twist webbing damper 1 M.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker having a multiple damper structure in which a vibration system is supported by two or more dampers.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a normal speaker.
The vibration system 10 including the voice coil 2 and the diaphragm 3 is supported by a single damper 1. In the figure, reference numeral 4 denotes an edge, 5 denotes a frame having a damper attachment portion 51, 6 denotes a magnetic circuit portion including a yoke Y, a magnet M, a top plate T, and the like. The voice coil 2 is disposed in a magnetic gap G. ing.

Recently, there has been a demand for a speaker capable of handling a large input, mainly a car speaker. Particularly, a bass speaker called a subwoofer has a strong tendency. In general, in order to cope with a large input and a large amplitude, the diaphragm 3 has to be made strong so as not to buckle at the time of the large amplitude, and the edge 4 provided on the outer peripheral portion of the diaphragm 3 also has a large amplitude. It must be strong enough to withstand the tensile forces that occur.

Further, the voice coil 2 has a structure in which the diameter of the coil wire is increased in order to withstand a large input and the diameter of the voice coil is enlarged to withstand a large input. In order to secure a stroke of the coil, the length of the voice coil bobbin 21 around which the coil is wound is increased to cope with a large amplitude.

Therefore, the diaphragm and the voice coil are much heavier than those used in a normal full-range speaker or the like, and the damper supporting the diaphragm and the voice coil is much more than a normal one. A large supporting force and toughness to withstand heat during large amplitude are required.

Generally, a loudspeaker damper is prepared by impregnating a thermosetting resin solution such as phenol resin diluted to a predetermined concentration with a solvent into a woven cloth or the like obtained by plain weaving fibers by dipping or the like. The solvent is volatilized to prepare a damper base fabric in which the resin is in an uncured state, and the base fabric is hot-pressed.

In order to support the above-described diaphragm and voice coil for large input and large amplitude, which must be much heavier than diaphragms and voice coils used for ordinary speakers, a single damper is required. In general, a method of lowering the compliance, that is, increasing the spring property of the damper, and supporting the vibration system with a so-called hard damper is common.

Therefore, in order to obtain a hard damper as described above, a method of impregnating a woven fabric with a large amount of phenol resin or the like to increase the damper hardness after hot pressing is generally used. When hot-press molding is performed on the impregnated damper base fabric, the gap between the fibers constituting the base fabric, that is, the resin exudes to the weave of the base fabric, and after molding, the gap between the fibers almost disappears, and the damper having poor air permeability is poor. Becomes

If such a damper having poor air permeability has an amplitude, it causes a distortion in the characteristics of the speaker due to the influence of the amplitude, and there is a defect of deteriorating the sound quality. Therefore, in order to cope with such a defect, the texture of the woven fabric is reduced. Even if a rough damper base fabric is made, the spacing of the weaves is unevenly distributed during hot pressing,
Generally, a misalignment damper is produced, and in such a damper, the compliance distribution becomes non-uniform and the damper does not form.

In order to solve the above-mentioned disadvantages, we have proposed a knitting damper (Japanese Utility Model Publication No. 7-951).
5). This warp knitting damper consists of two or more sets of twisted warp and weft yarns, and at the intersection of the warp and weft yarns, one of the warp yarns or the weft yarns enters the "twist" of the other yarn in a mesh form. Using a knitted fabric called "knitting knitting" as a damper material, impregnating this damper material with a phenolic resin or other thermosetting resin, and integrating corrugation in a concentric manner by molding means such as thermoforming It is formed by molding.

[0011] Even if the weaving knitting damper has an extremely coarse weave (mesh) several tens of times that of a conventional damper, the intersection between the warp and weft yarns is substantially equal to the mechanically fixed shape. The force is very strong, and unlike the conventional damper made of woven fabric, the intersection of the warp and the weft does not peel off and the warp and the weft do not shift during molding.

Therefore, there is no molding unevenness in the molded damper, the distribution of compliance is uniform, and the rolling phenomenon does not easily occur, and the number of fibers used in a commonly used damper is reduced. The number of twists is large, and the yarn becomes thick, so that it is much more tough against the tensile force. Moreover, since the mesh has a very coarse mesh structure, the damper is much more noticeable than the conventional damper, so the air resistance at the time of amplitude can be significantly reduced, and the resulting distortion is suppressed to faithfully reproduce the audio signal. Can be played.

[0013] However, due to the structural characteristic that this stitched damper has a stitch that is much wider than the weave of the conventional damper, dust easily passes through the mesh. As shown, there is a problem that dust entering the back surface 8 of the damper 1 further enters the magnetic gap G and comes into contact with the outer peripheral portion of the voice coil 2 to generate abnormal noise when the voice coil moves in amplitude. There were problems to be solved.

On the other hand, a bass speaker called a subwoofer is required to have a larger output, and a single damper as shown in FIG. 3 (hereinafter referred to as a single damper).
Since there is a limit to the range that can be supported while maintaining the linearity of the diaphragm 3 and the voice coil 2, a multiple damper structure that supports the vibration system with two or more dampers, for example, the upper part of the voice coil bobbin 21 is vertically arranged in two stages. The double damper type that is supported is widely used.

In the case of such a multiple damper or double damper, the number of supporting points is increased, so that even if the diaphragm or the voice coil becomes heavy, it can be reliably supported. Can be dealt with without losing the linearity in. However, in this method, simply providing two or more conventional conventional dampers inevitably forms an air chamber between the dampers,
At the time of the amplitude, the movement of the vibration system components including the damper is more restricted than that of the single damper due to the influence of the viscous resistance of the air closed in the air chamber.

In order to cope with such a drawback, it is conceivable to take measures to reduce the impregnation amount of the damper base fabric with phenolic resin or the like or to increase the interval between the woven yarns in the damper base fabric. The compliance of the damper is weakened, that is, the spring property of the damper is weakened, resulting in a so-called soft damper or a non-uniform compliance distribution. If the diaphragm and the voice coil become heavy, they cannot be supported. Problems such as the bottom of the voice coil hitting the yoke of the magnetic circuit or the voice coil rolling at the time of amplitude occur, and it is difficult to obtain reliability.

[0017]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to eliminate the viscous resistance of air which a conventional double damper or multiple damper necessarily has, and furthermore, to provide a vibration system even at a large input and a large amplitude. It is an object of the present invention to provide a speaker structure capable of ensuring linearity during driving.

[0018]

According to a first aspect of the present invention, there is provided a loudspeaker structure comprising a multi-damper speaker having a vibration system supported by two or more dampers.
One of the multiple dampers has a warp and a weft composed of two or more twisted yarns. At the intersection of the warp and the weft, either the warp or the weft enters the “twist” of the other yarn. A knitted fabric formed by twisting and knitting in a net shape is used as a damper material, and this damper material is impregnated with a phenolic resin or other thermosetting resin, and corrugated corrugated concentrically by a molding means such as thermoforming. It is a damper knitting damper formed by integral molding.

According to a second aspect of the present invention, the damper closer to the diaphragm is a knitting damper.

According to the third aspect of the present invention, any one of the dampers other than the twisting knitting damper is formed by braiding a plurality of tinsel wires obtained by winding a copper foil around a core yarn into a flat net shape. It is a conductive damper in which a conductive material made of wire is mounted along a corrugation.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a loudspeaker structure according to the present invention will be described with reference to FIGS. 1 and 2. The same components as those described with reference to FIG. The description is omitted. In FIG. 1, the vibration system 1
2 shows a speaker of a double damper type in which 0 is supported by two dampers, and the upper part of the voice coil bobbin 21 is supported by an upper damper 11 and a lower damper 12 which are arranged in upper and lower two stages. A damper 1M is used, and a conductive damper 1F is used for the lower damper 12.

As shown in FIG. 2, the warp knitting damper 1M used as the upper damper 11 has a warp 1Mv and a weft 1M.
Mh is two or more sets of twisted yarns, and at the intersection 1Mx of the warp yarn and the weft yarn, one of the warp yarns and the weft yarns is woven into the “twist” of the other yarns in a net-like manner, and is referred to as “twisting”. Is a commercially available product called “CO-9800” under the trade name, and is obtained by twisting five 20-count polyaramid yarns by five.
This is a knitted cloth made by knitting books into one, and knitting 4.6 yarns per inch both vertically and horizontally.

The knitted fabric was dipped in a phenol resin solution set to a specific gravity of 0.950 to impregnate the phenol resin, the methanol solvent was volatilized to remove the resin tack, and then corrugation was integrally formed by hot-pressure molding. . In the example, a braided damper 1M having six corrugations provided concentrically between an outer diameter of 200 mm and an inner diameter of 80 mm was obtained.

The conductive damper 1F used as the lower damper 12 is a flat braided tinsel wire F obtained by combining any number of tinsel wires formed by winding a copper foil around a core yarn into a flat net shape.
Is attached to a normal type damper along the corrugation, and is manufactured by using a commercially available woven fabric made of polyaramid fiber (trade name “CO-1200”).
Is dipped in a phenol resin solution set to a specific gravity of 0.925 to impregnate the phenol resin, the methanol solvent is volatilized to remove the resin tack, and then cut to a predetermined width to obtain a damper base fabric.

The flat knitting tinsel wire F has a center yarn of 200 denier para-aramid fiber, and the center yarn has a width of 0.32 m.
m, 13 tin bronze wires formed by winding a single layer of a tin alloy copper foil having a thickness of 0.027 mm at 22 turns / cm, and a braid pitch of about 2
It is knitted in a flat mesh so as to have a finished width of about 8 mm at 7.45 mm / time. Two flat knitting yarns F are parallel to the center line of the damper base cloth, and have a pitch of 45 m.
Sew with m.

The damper base fabric to which the flat braided tinsel wire F is mounted is hot-pressed in the same manner as in the prior art with reference to the center line of the base fabric, and is formed on a concentric circle between an outer diameter of 175 mm and an inner diameter of 80 mm. Conductive damper 1F integrally molded into a shape having corrugations, unnecessary portions are removed by trimming, and flat braided tinsel wire F is mounted along the corrugations.
I got

As shown in FIG. 1, using the warp-knitting damper 1 M and the conductive damper 1 F configured as described above, the warp-knitting damper 1 M as the upper damper 11 closer to the diaphragm 3 and the lower damper 12 By arranging the conductive dampers 1F respectively, a double damper type subwoofer having a diameter of 300 mm was created. In the drawing, reference numeral 9 denotes a space between the upper damper and the lower damper.

Next, as a result of listening comparison between the subwoofer according to the embodiment configured as described above and a sub-woofer having a diameter of 300 mm of a double damper type using a conventional general damper, the sub-woofer according to the embodiment is shown. Is
It was confirmed that there was an effect of reducing distortion in low-frequency reproduction at the time of large output, which contributed to improvement of sound quality.

As described above, when the conductive damper 1F is used as the other damper together with the braided damper 1M, the limit amplitude of the braided damper 1M is set to be smaller than that of the conductive damper 1F. It has been found that the attached flat braided tinsel wire F can be prevented from breaking due to a load such as tension near the limit amplitude. The flat braided tinsel wire F in the conductive damper 1F is weak in tensile force, and the limit amplitude state, that is, the state in which corrugation has been extended with a large amplitude (commonly called a tension state) continues intermittently or continuously for a short time. The copper foil easily breaks and breaks.

Therefore, when using the conductive damper 1F, it is preferable to design the flat braided tinsel wire F so as not to be in a stretched state. However, in the case of a speaker for a large amplitude, the flat braided tinsel wire F often falls into a stretched state. Therefore, the use of the conductive damper 1F is often limited.
However, since the braided damper 1M is extremely tough against the tensile force, it is difficult to break even if the tension state of the limit amplitude continues for a long time, and the sound generated when the tension is stretched, so-called “stretch sound”. It has less advantages than conventional general dampers.

In view of the above, in the state of the damper 1 at the time of the limit amplitude, the warp-knitting damper 1M is brought into a state in which it is stretched first,
By designing the conductive damper 1F to have a margin, the tensile force of the conductive damper 1F to the flat knitting wire F is reduced, so that the copper foil constituting the flat knitting yarn F is broken. This has the effect of significantly reducing the reliability and significantly improving the reliability, and has made it possible to further expand the range of use of the conductive damper 1F to applications for large-amplitude speakers.

If a conventional general damper is used in place of the braided damper 1M so as to be stretched at the limit amplitude, the damper is cut in a short time, and as a result, the flat braided tinsel wire F of the conductive damper 1F is cut. It has also been found that problems such as disconnection in a shorter time than the conventional conductive damper 1F occur.

In general, a double damper speaker has a structure in which an upper damper 11 covers a lower damper 12, as shown in FIG. 1, so whether the double damper structure is employed or not depends on the appearance of the speaker. Is unidentifiable. However, when the knitting damper 1M is used for the upper damper 11, the lower damper 12 can be easily seen through the mesh of the upper damper 11 as shown in FIG. Become.

Therefore, the lower damper 12 is also used in the inspection process.
Is advantageous in that it can be checked in the case of failure, and has the advantage that the probability of dust entering the magnetic gap G during assembly is significantly reduced as compared with the case where the knitting damper 1M is attached to the lower side. Since the double damper structure provides a visual effect that can be understood and understood at a glance for consumers, it also has advantages such as being effective in improving the commercial value.

Although the embodiment of the present invention has been described with respect to the double damper type speaker, it is needless to say that the present invention can be applied to a multiple damper in which the vibration system is supported by three or more dampers.

[0036]

According to the loudspeaker structure according to the present invention, the problem of the warp-knitting damper that dust easily enters the magnetic gap gap is solved, and the advantage of the warp-knitting damper is maximized. The disadvantage of the double damper type speaker can be eliminated. That is, since the knitting knitting damper is used as one of the upper and lower dampers 11 and 12 of the double damper and the normal damper is used as the other damper, dust enters the magnetic gap at least by a conventional general speaker. Quality level can be maintained.

In addition, since either the upper damper or the lower damper in the double damper is a knitting damper, the texture of any of the dampers has an extremely coarse mesh. Therefore, unlike the conventional double damper, there is no air chamber having poor air permeability in the space between the upper damper and the lower damper. Viscous drag is greatly reduced.

As a result, the movement of the vibration system components is greatly improved, and the audio signal can be faithfully reproduced. In addition, the structural characteristics of the braided knitting damper include no molding unevenness and a compliance distribution. Because of the advantages of being uniform and of being less likely to cause rolling phenomena, there is a problem with conventional loudspeakers equipped with a damper, namely, as the input increases and the amplitude increases, the linearity is maintained by the damper strut. This eliminates the disadvantage of being lost, and it is possible to maintain the linearity of the damper until a large input, and to obtain a high-performance speaker capable of handling even a larger input.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a speaker structure of the present invention.

FIG. 2 is a perspective view showing a braided damper and a conductive damper.

FIG. 3 is a cross-sectional view of a conventional general single damper type speaker.

[Explanation of symbols]

 Reference Signs List 1 damper 11 upper damper 12 lower damper 1F conductive damper 1M warp knitting damper 1Mv warp 1Mh weft 1Mx intersection 2 voice coil 21 voice coil bobbin 3 diaphragm 4 edge 5 frame 51 damper pasting portion 6 magnetic circuit section G magnetic gap 10 magnetic gap

Claims (3)

[Claims] 1. A multi-damper speaker in which a vibration system is supported by two or more dampers, wherein one of the multi-dampers has a warp and a weft composed of two or more twisted yarns, and a warp and a weft. At the intersection of the warp yarn or the weft yarn, the knitted fabric made by braiding, which is woven in a net-like state with the other yarn entering the "twist" of the other yarn, is used as a damper material. And a corrugated corrugation integrally formed by a molding means such as thermoforming. 2. The speaker structure according to claim 1, wherein the damper closer to the diaphragm is a knitting damper. 3. A damper other than the braided damper is configured to corrugate a conductive material made of a flat knitting wire formed by braiding a plurality of tinsel wires formed by winding a copper foil around a core yarn into a flat net shape. The speaker structure according to claim 1, wherein the speaker structure is a conductive damper mounted along the state.