CN107820167B

CN107820167B - High pitch diaphragm of belt loudspeaker and tensioning device thereof

Info

Publication number: CN107820167B
Application number: CN201710951876.8A
Authority: CN
Inventors: 何永斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-10-13
Filing date: 2017-10-13
Publication date: 2020-09-01
Anticipated expiration: 2037-10-13
Also published as: CN107820167A

Abstract

The invention discloses a ribbon loudspeaker high pitch vibrating diaphragm and a tensioning device thereof, wherein the vibrating diaphragm is a ribbon vibrating diaphragm with a non-woven structure, the vibrating diaphragm comprises N groups of lead groups which are connected in parallel by a plurality of parallel fine leads and a bonding layer which bonds the N groups of lead groups into the ribbon vibrating diaphragm, and all the lead groups in the vibrating diaphragm are connected in series or in series-parallel through an external circuit, so that after current is connected, all the lead groups have synchronous acceleration in the width direction of a magnetic gap when the vibrating diaphragm vibrates. The invention relates to a high pitch diaphragm of a belt loudspeaker, which can lead the diaphragm to vibrate synchronously, and avoids the distortion problem caused by the deformation of the diaphragm due to the uneven stress of electromagnetic force in the width direction because of the uneven magnetic induction intensity in a magnetic gap. Meanwhile, the tensioning device provided by the invention also has the advantages of simple structure, large linear stroke and self-balancing tension.

Description

High pitch diaphragm of belt loudspeaker and tensioning device thereof

Technical Field

The invention relates to a belt type loudspeaker of one of electric loudspeakers in sound equipment, belongs to the technical field of electroacoustic, and particularly relates to a vibrating diaphragm structure in the belt type loudspeaker and a vibrating diaphragm tensioning device of the vibrating diaphragm structure.

Background

The famous semiconductor scientists Walter Schottky and Siemens Halske invented the ribbon tweeter in 1923, and the application is not wide at that time because a magnet with strong magnetism cannot be found, the impedance and the bearing power of a diaphragm are small, and the efficiency is low. Later, people utilized aluminum diaphragms and made magnetic circuits of materials with strong magnetism to match with vibration systems, so that good efficiency and sound quality were obtained, and the ribbon tweeters began to be gradually popularized in application of high-end speaker systems.

Conventional ribbon loudspeaker diaphragms have several forms:

pure aluminum vibrating diaphragm: as CN 98246922: the diaphragm is made of a single piece of aluminum foil, which has a very low impedance and requires a transformer for impedance transformation in connection with the power amplifier. The diaphragm is easily impacted or torn due to metal fatigue due to stress concentration; the diaphragm is also pressed into a wavy shape to reinforce the strength in the width direction, and the synchronous movement of the diaphragm in the width direction is initially ensured, but the aluminum band is often distorted and generates strong metal sound at a specific frequency due to various imbalance factors. In addition, the diaphragm keeps certain tension through the contraction of the wave-shaped embossing of the diaphragm, but because the rebound resilience of aluminum is poor, permanent deformation is easy to occur due to impact, and the positioning precision of an aluminum strip in a magnetic circuit is not high.

Compound vibrating diaphragm: for example, CN200420023548, the combination of conductive metal foil and organic film can significantly enhance the strength of the diaphragm and increase the internal damping thereof, but still requires an impedance matching transformer.

Composite printed diaphragms, as disclosed in CN201310300212, are manufactured by etching processes on aluminum foil with an organic thin film as a base material to have a specific impedance, and such diaphragms can be directly driven by a conventional power amplifier, and do not require a transformer for impedance matching. This kind of diaphragm performance has been comparatively comprehensive, and only for pure aluminium vibrating diaphragm, the composite bed has increased the quality of vibrating diaphragm, and efficiency slightly reduces, and the substrate of making this kind of vibrating diaphragm often stores up certain stress at the compound production process in addition, and the inhomogeneous also can lead to the diaphragm to warp of stress, and the planarization of sound membrane still has the improvement space, and the stress uniformity of diaphragm is especially important to the level and smooth of making large-scale aluminium strip high pitch such as the aluminium strip high pitch vibrating diaphragm that length reaches 1 meter.

The sound membrane has better self-damping, but the production difficulty is higher compared with the above type of vibration membranes, because a precise weaving machine is needed to ensure the dimensional precision and the uniformity of the sound membrane after weaving because of weaving fine woven wires, the operation difficulty is high, and the cost is higher.

Therefore, the existing vibrating diaphragm is uneven in magnetic induction intensity in the magnetic gap, the vibrating diaphragm caused by ampere force deforms, the distortion problem affects the use quality of the vibrating diaphragm, and meanwhile, whether the tension of the vibrating diaphragm per se uniformly and equally affects the stress condition of the vibrating diaphragm in the use process is judged.

Disclosure of Invention

The invention aims to provide a high-pitch diaphragm of a band loudspeaker, which can ensure that the diaphragm has the same acceleration in the width direction of a magnetic gap so as to ensure that the diaphragm vibrates synchronously, and the problem of distortion caused by deformation of the diaphragm due to nonuniform stress of electromagnetic force in the width direction due to nonuniform magnetic induction strength in the magnetic gap is solved.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a high-pitch diaphragm of a ribbon loudspeaker, which is positioned in the center of a magnetic gap of the loudspeaker, wherein the diaphragm is a ribbon diaphragm with a non-woven structure, and comprises N groups of parallel lead groups formed by a plurality of parallel fine leads and an adhesive layer for adhering the N groups of lead groups into the ribbon diaphragm.

In a preferred embodiment of the present invention, the adhesive layer is formed by coating an adhesive mixed into the fiber material outside the wire group.

In a preferred embodiment of the present invention, the fine wire has a cross section of any one of a circle, a square and a polygon.

As a preferred embodiment of the present invention, the wire groups are connected in series in the current direction, the diaphragm has uniform quality, and the number of the fine wires of each wire group is in direct proportion to the magnetic induction intensity of the position, so that after the current is applied, the diaphragm vibrates, and each wire group has synchronous acceleration in the width direction of the magnetic gap. Each lead group is formed by connecting X1, X2, and X3 … … Xn fine leads In parallel, and the currents flowing through each group are I1, I2, …, and In, respectively. According to

Obtaining:

is the average magnetic induction at the location of the conductor set. Δ Mn is the mass that the fine wire is responsible for driving (including the mass of the diaphragm in the drive region divided by the wire itself and the additional mass of air in the wire drive region).

From the above formula, it can be seen that the vibrating diaphragm can be synchronously vibrated in the width direction immediately by adjusting the number of each group of fine wires or the current magnitude of each group of fine wires (which can be realized by adjusting the current magnitude of each foot through an external current distribution circuit), adjusting Δ Mn (which can be realized by changing the density of the fine wires), or cooperatively adjusting.

Modifying the above formula (1) to obtain:

as a preferred scheme, each wire group is connected in series to make the current equal, and the quality of the diaphragm is controlled to be uniform, that is, Δ Mn is the same, so that the following is obtained:

preferably, the acceleration of each wire group in the width direction of the magnetic gap is controlled to be uniform according to the direct proportional relationship between the magnetic induction intensity in the magnetic gap and the number of wires in the wire group, so that the diaphragm vibrates synchronously in the magnetic gap according to the equation (3).

In order to avoid the impedance of the diaphragm in the magnetic gap from being too large due to too many wire groups, the number N of the wire groups is set to be even, and two wire groups symmetrically distributed in the magnetic gap from the center line of the width of the magnetic gap are formed, the wire groups in the two wire groups are connected in series, and the two wire groups are connected in parallel, so that the impedance can be reduced by half.

The invention also provides a tension device of the high pitch vibrating diaphragm of the belt loudspeaker, which comprises tension sheets adhered to two ends of the vibrating diaphragm through adhesives, pulleys on two sides of the tension sheets, fixed pulley supports and elastic connecting pieces, wherein the elastic connecting pieces are connected to two ends of the tension sheets by bypassing two ends of the pulleys.

Furthermore, the tensioning device also comprises a vibrating diaphragm guide wheel, and the vibrating diaphragm guide wheel is tightly attached to the vibrating diaphragm for fixing. The tensioning device can be steered through the vibrating diaphragm guide wheel, so that the overall length of the tensioning device is reduced, and the space required by the use of the tensioning device is reduced.

Further, the elastic connecting piece is a spring or an elastic line.

Furthermore, the elastic connecting piece is connected with the tension sheet hanging buckle or in a bonding way.

The invention has the beneficial effects that: the vibrating diaphragm is an integral vibrating diaphragm formed by coating a bonding agent on a wire group, and is divided into N groups of wire groups connected in parallel by a plurality of parallel fine wires, so that the vibrating diaphragm synchronously vibrates by controlling the number of the fine wires of each wire group by utilizing the direct proportional relation between the magnetic induction intensity in a magnetic gap and the number of the wires in the wire groups in a serial connection state, and the vibrating diaphragm has the same acceleration in the width direction of the magnetic gap, thereby avoiding the phenomena of deformation and distortion of the vibrating diaphragm caused by uneven magnetic field. Meanwhile, the vibrating diaphragm can synchronously vibrate in the width direction by reasonably controlling the current of the wire group or adjusting the quality of each part of the vibrating diaphragm (namely controlling the density of the fine wires of the wire group to change the unit mass), thereby avoiding the phenomena of deformation and distortion of the vibrating diaphragm caused by nonuniform magnetic field. In addition, the tensioning device provided by the invention has the advantages of simple structure, large linear stroke and self-balancing tension, the tension of the vibrating diaphragm is fixed by the elastic connecting piece, and in the tensioning process, the stress at each part of the vibrating diaphragm can be automatically balanced due to the elastic deformation of the elastic connecting piece, so that the aim of uniform tensioning is efficiently achieved.

Drawings

Fig. 1 is a schematic cross-sectional structure view of a high pitch diaphragm of a ribbon speaker according to the present invention;

fig. 2 is a schematic structural view of a high pitch diaphragm of a band loudspeaker in the magnetic gap according to embodiment 1;

fig. 3 is a schematic structural view of a high pitch diaphragm of a band speaker in embodiment 2 in a magnetic gap;

fig. 4 is a schematic structural view of a tension device for a tweeter diaphragm of a band speaker according to embodiment 3;

fig. 5 is a schematic structural view of a tension device for a tweeter diaphragm of a band speaker according to embodiment 4;

the magnetic resonance imaging device comprises 1-fine wires, 2-bonding layers, 3-magnetic poles, 4-wire groups, 5-leads, 6-outgoing lines, 7-diaphragms, 8-pieces, 9-elastic connecting pieces, 10-pulleys, 11-pulley supports and 12-diaphragm guide wheels.

Detailed Description

Example 1

As shown in fig. 1 and fig. 2, the high pitch diaphragm of a ribbon speaker is positioned at the center of a magnetic gap of a speaker magnetic pole 3, the diaphragm 7 is a ribbon diaphragm with a non-woven structure, the diaphragm 7 includes N groups of wire groups 4 connected in parallel by a plurality of parallel fine wires 1 and an adhesive layer 2 adhering the N groups of wire groups 4 into the ribbon diaphragm, each wire group 4 in the diaphragm 7 is connected in series by a lead 5 through an external circuit, so that after current is supplied through the lead 6, each wire group 4 has a synchronous acceleration in the width direction of the magnetic gap when the diaphragm 7 vibrates. The lead groups 4 are connected in series, the quality of the vibrating diaphragm 7 is uniform, and the number of the fine leads 1 of each lead group 4 is in direct proportion to the magnetic induction intensity of the position.

In this example, the adhesive layer 2 is formed by coating an adhesive mixed into a fiber material outside the wire group 4.

In this example, the fine wire 1 has a circular cross section.

Example 2

As shown in fig. 3, the high pitch diaphragm of a ribbon speaker is positioned at the center of a magnetic gap of a magnetic pole 3 of the speaker, the diaphragm is a ribbon diaphragm with a non-woven structure, the diaphragm 7 includes N groups of wire groups 4 connected in parallel by a plurality of parallel fine wires 1 and an adhesive layer 2 adhering the N groups of wire groups 4 into the ribbon diaphragm, each wire group 4 in the diaphragm 7 is connected by an outgoing wire 6 of an external circuit, in order to avoid the diaphragm 7 in the magnetic gap from having too large impedance due to too many wire groups 4, the number of the groups of the wire groups 4 is set as an even number, and two groups of wire groups are formed, which are symmetrically distributed in the magnetic gap by a midline of the width of the magnetic gap, the wire groups 4 in the two groups of wire groups are connected in series by a lead 5, the two groups of wire groups are connected in parallel by the outgoing wire 6, so that after current is applied, each wire group 4 has synchronous acceleration in the width direction of the magnetic gap when, while the impedance can be reduced by half.

In this example, the adhesive layer 2 is formed by coating an adhesive mixed into a fiber material on the outside of the wire group 4.

In this example, the fine wire 1 has a square cross section.

Example 3

As shown in fig. 4, the tension device for a high pitch diaphragm of a tape speaker comprises a tension sheet 8 bonded to two ends of a diaphragm 7 by an adhesive, pulleys 10 on two sides of the tension sheet 8, a fixed pulley support 11, and elastic connecting members 9, wherein the elastic connecting members 9 are connected to two ends of the tension sheet 8 by being wound around two ends of the pulleys 10.

In this example, the elastic connection 9 is an elastic thread.

In this example, the elastic threads are adhesively connected to the tension sheet 8.

The tensioning device has the advantages of simple structure, large linear stroke and tension self-balancing, the tension of the vibrating diaphragm 7 is fixed by the elastic connecting piece 9, and in the tensioning process, the stress of each part of the vibrating diaphragm 7 can be automatically balanced due to the elastic deformation of the elastic connecting piece 9, so that the purpose of uniform tensioning can be achieved efficiently.

Example 4

As shown in fig. 5, the tension device for a high pitch diaphragm of a tape speaker includes a tension sheet 8 bonded to two ends of a diaphragm 7 by an adhesive, pulleys 10 on two sides of the tension sheet 8, a fixed pulley bracket 11, and elastic connecting members 9, wherein the elastic connecting members 9 are connected to two ends of the tension sheet 8 by being wound around two ends of the pulleys 10.

In this example, the tensioning device further includes a diaphragm guide wheel 12, and the diaphragm guide wheel 12 is fixed to the diaphragm 7. Compared with the tensioning device in embodiment 3, the tensioning device can be steered by the diaphragm guide wheel 12 in this example, so that the overall length of the tensioning device is reduced and the space required for its use is reduced.

In this example, the elastic connection 9 is a spring.

In this example, the spring is in hooking connection with the tension piece 8.

The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The scope of the present invention is defined by the appended claims, and any equivalent modifications based on the technical teaching of the present invention are also within the scope of the present invention.

Claims

1. The utility model provides a ribbon loudspeaker high pitch vibrating diaphragm, is located the center department of speaker magnetic gap, its characterized in that, the vibrating diaphragm is the silk ribbon vibrating diaphragm of non-woven structure, the vibrating diaphragm includes N group by the parallelly connected wire group of many parallel fine wires and with N group wire group bonds into the bond line of ribbon vibrating diaphragm, makes after the access current, each wire group has synchronous acceleration in the magnetic gap width direction during the vibrating diaphragm vibration.

2. The ribbon loudspeaker diaphragm of claim 1 wherein the adhesive layer is formed by applying an adhesive mixed into a fabric over the wire set.

3. The ribbon loudspeaker high pitch diaphragm of claim 1, wherein the fine wire has a cross-section of any one of a circle, a square and a polygon.

4. The ribbon loudspeaker high pitch diaphragm of claim 1, wherein each wire set is connected in series with the current direction, and the diaphragm has a uniform mass, and the number of fine wires of each wire set is in direct proportion to the magnetic induction intensity at the location.

5. The ribbon loudspeaker high pitch diaphragm of claim 4 wherein N is an even number and the N sets of wires form two sets of wires symmetrically distributed in the magnetic gap from a centerline of the width of the magnetic gap, the sets of wires in the two sets of wires being connected in series with each other and the sets of wires being connected in parallel.

6. A tension device of ribbon loudspeaker high pitch diaphragm as claimed in any one of claims 1 to 5, wherein said tension device comprises a tension sheet bonded to both ends of the diaphragm by an adhesive, pulleys on both sides of the tension sheet and fixed pulley holders, and elastic connecting members connected to both ends of the tension sheet around both ends of the pulleys.

7. The tension device for a high pitch diaphragm of a tape speaker as claimed in claim 6, further comprising a diaphragm guide roller, wherein the diaphragm guide roller is fixed against the diaphragm.

8. The tension device for a ribbon loudspeaker diaphragm of claim 6 wherein the elastic connecting member is a spring or an elastic wire.

9. The tension device for a ribbon loudspeaker high pitch diaphragm of claim 6, wherein the elastic connecting member is connected with the tension sheet by hanging or bonding.