JPH08163694A - Integral type loudspeaker diaphragm - Google Patents

Abstract

PURPOSE: To provide an integral type loudspeaker diaphragm easy in manufacture, generating no rolling and capable of performing broad-band reproduction that scarcely including its proper tone. CONSTITUTION: A coil bobbin part 22 is molded integrally with a cone part 21, and plural projecting reinforcing plates 23 are provided on the boundary part of the coil bobbin part 22 and the cone part 21 in a circumferential direction keeping a prescribed interval, and a groove 23a is provided on the ridge lines of those reinforcing palates 23, and the draw-out wire 7 of a voice coil wire is fixed by inserting into the partial groove 23a in the reinforcing plate 23, and also, a member 24 for balance to take balance between the weight of the draw-out wire 7 is fixed on the groove 23a of the reinforcing plate 23 at an opposite side position confronting with the reinforcing plate 23 in which the draw-out wire 7 is fixed by inserting into the groove. Therefore, since the mass balance of a vibration system can be taken, rolling phenomenon can be suppressed, and the broad-band reproduction with small proper tone can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integral speaker diaphragm formed by integrally molding a coil bobbin portion and a cone portion.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view showing a conventional cone speaker. In the figure, (1) is a cone having a truncated cone shape, and (2) is a cylinder inserted into and bonded to a central circular hole of the cone (1). -Shaped coil bobbin, (3) voice coil wire wound around the coil bobbin (2) and fixed with varnish, (4) is a frame, (5) supports the periphery of the cone (1) on the frame (4) Edge, (6) is a spider that supports the coil bobbin (2) on the frame (4),
(7) is a lead wire of the voice coil wire (3), (8) is a connecting terminal of the lead wire (7) provided on the frame (4), (9) is a top plate, (10) is a magnet, (11) ) Is a pole piece,
(12) is a dust cap.

By applying an input signal to the terminal (8),
A current corresponding to the input signal flows to the voice coil wire (3) via the lead wire (7), and this current causes the coil bobbin to be stored in the space between the top plate (9) and the pole piece (11). The driving force acts on (2), and the coil bobbin
The cone (1) bonded to (2) vibrates back and forth and is emitted into the air as sound pressure.

Further, in order to eliminate the vibration loss due to the adhesive layer between the cone (1) and the coil bobbin (2) and to obtain a speaker diaphragm having excellent sound pressure-frequency characteristics, the cone and the coil bobbin have a specific elastic modulus. A diaphragm having a structure in which a thermoplastic material having a large and moderate internal loss is integrated by an injection molding method has been conventionally used.

[0005]

In the conventional speaker diaphragm shown in FIG. 7, since the lead wire (7) of the voice coil wire (3) is taken out directly from the coil bobbin (2), it is connected from the take-out port. Voice coil wire (3) due to vibration of freely drawn lead wire (7) to terminal (8), vibration of coil bobbin (2) and heat generation of voice coil wire (3)
There was a risk that the sound would be separated from the coil bobbin (2) and the characteristics would be adversely affected. Furthermore, the peeling may cause the voice coil wire (3) and the coil bobbin (2) to rub against each other, resulting in burning. In addition, the weight of the lead wire (7) causes a mass imbalance in the radial direction of the vibration system, so that the voice coil wire (3) is pulled to one side when the coil bobbin (2) vibrates and the voice coil wire (3) contacts the pole piece (11). The rolling phenomenon occurs even if it is not touched or touched, and abnormal sounds are easily generated due to the rolling phenomenon.

Further, in a diaphragm having a structure in which a cone and a coil bobbin are made of a thermoplastic material integrated by an injection molding method, since the density is higher than that of a material such as paper, it is possible to reduce the thickness to secure a sound pressure level. Although it is possible, deformation was caused by uneven thickness, etc., and there was a limit to the reduction in thickness from the viewpoint of mechanical strength.

Further, when a thermoplastic resin produced by an injection molding method is used as a material, depending on an adhesive such as a varnish for fixing the voice coil wire or the lead wire and the voice coil bobbin portion,
Adhesiveness with it was poor, and the voice coil wire was softened by the heat generated by high input and peeled off from the voice coil bobbin portion, sometimes causing misalignment and burning.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain an integrated speaker diaphragm having a large durability and a wide reproduction band characteristic.

[0009]

An integrated speaker diaphragm according to the present invention has a coil bobbin portion and a cone portion at a boundary portion thereof.
A plurality of reinforcing plates having radial grooves are provided at predetermined intervals in the circumferential direction, and lead wires of the voice coil wire wound around the coil bobbin portion are provided in some of the grooves of the reinforcing plates. It is inserted and fixed. Further, a step for positioning the voice coil wire is provided at an end of the reinforcing plate on the coil bobbin side.

Further, a balancing member that is in balance with the weight of the lead wire is fixed to a reinforcing plate at a position opposite to the reinforcing plate in which the lead wire is inserted and fixed in the groove. Further, the balancing member is a rod-shaped member that is inserted and fixed in the groove of the reinforcing plate on the opposite side. Furthermore, the above-mentioned balancing member is a rod-like member which is bridged and fixed to a plurality of reinforcing plates so as to be separated from the surface of the coil bobbin portion and parallel to this surface.

[0011]

In the integrated speaker diaphragm of the present invention, the lead wire of the voice coil wire is inserted and fixed in the groove of a part of the plurality of reinforcing plates provided at the boundary between the coil bobbin portion and the cone portion. The lead-out angle of the leader line is close to the angle of the substantially diaphragm shape, and the leader line can be easily routed, and the length of the leader line that is freely wired also becomes short, which makes it difficult to cut the leader line. In addition, the step of the end portion of the reinforcing plate on the coil bobbin portion side facilitates positioning of the voice coil wire when winding the voice coil wire around the coil bobbin portion, and prevents displacement of the voice coil wire at high input. .

Further, since a balance member such as a rod-like body that is balanced with the weight of the leader wire is fixed in the groove of the reinforcing plate at the opposite side opposite to the reinforcing plate in which the leader wire is inserted and fixed in the groove. , The mass imbalance due to the weight of the leader line is released, and it is possible to reproduce without eigen sound without rolling. Furthermore, since the rod-shaped body serving as the balancing member is bridged at a position apart from the surface of the coil bobbin portion of the reinforcing plate at the opposite side positions, the weight of the weight leader line can be balanced with a lighter rod-shaped body.

[0013]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show Embodiment 1 of the present invention, FIG. 1 is a front view, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is taken along line III-III of FIG. Partial sectional view, FIG. 4 shows I of FIG.
FIG. 5 is a partial cross-sectional view taken along line V-IV.

In the figure, (20) is a diaphragm integrally formed by injection molding or the like, (21) is a truncated cone portion of the diaphragm,
(22) is the cylindrical coil bobbin part, (3) is the coil bobbin part
A voice coil wire wound around (22) and fixed with varnish, (7) is a lead wire of the voice coil wire (3), and (23) is
At the boundary between the cone portion (21) and the coil bobbin portion (22), a plurality of projecting reinforcing plates integrally provided with them at predetermined intervals in the circumferential direction, (23a) are these reinforcing plates (23) The lead wire (7) is inserted and fixed in the groove (23a) of a part of the reinforcing plate (23) in the radial groove provided in the. (23b) is a voice coil wire connecting the lower end of the reinforcing plate (23) to the coil bobbin (22).
A step provided to extend to the winding start position of (3), (24)
Is a rod-shaped balance member made of a metal rod fixed in the groove (23a) of the reinforcing plate (23) at the opposite position facing the reinforcing plate (23) in which the lead wire (7) is inserted and fixed. Make up.

Next, the operation will be described. When an acoustic signal is applied to the voice coil wire (3) from the outside through the lead wire (7), the coil bobbin part (22) of the diaphragm (20) is driven back and forth and vibrates together with the cone part (21). It is emitted as a noise. At this time, since the connecting portion between the cone portion (21) and the coil bobbin portion (22) is reinforced by the reinforcing plate (23), the diaphragm (20) can be easily thinned. Further, the weight of the lead wire (7), which is inserted and fixed in the groove (23a) and is wired up to a connection terminal (not shown) provided on the frame (4), is at an axially symmetrical position of the cylindrical coil bobbin portion (22). Groove (23a) in reinforcing plate (23)
Balanced with the weight of the metal rod (24) fixed inside, the mass balance of the vibration system becomes uniform, rolling phenomenon from low frequency band to high frequency band is prevented, and wide band reproduction without eigen sound is possible. .

The lead wire (7) is fixed to the groove (23a) of the reinforcing plate (23) from its connecting portion with the voice coil wire (3), and the surface of the cone portion (21) is kept at the lead angle. Since it can be pulled out without being bent along with, the lead wire (7) is very unlikely to break even at high input. In addition, the step (23b) provided at the lower end of the reinforcing plate (23) allows the voice coil wire (3) to be positioned when wound around the coil bobbin portion (22), which enables accurate and easy winding work. it can. Furthermore, the voice coil wire (3) is prevented from being displaced or separated from the coil bobbin portion (22) due to vibration, heat generation, etc., and it is possible to prevent the displacement due to a particularly large signal input, which is resistant to high input and high quality. The speaker of is obtained.
In addition, in this Example 1, a metal rod (2
Although 4) is used, the corresponding reinforcing plate may be made larger to achieve balance.

Example 2. 5 and 6 show Embodiment 2 of the present invention, FIG. 5 is a front view, and FIG. 6 is a sectional view taken along the line VI-VI of FIG. In the figure, (3) is a voice coil wire, (7) is a lead wire, (20) is a diaphragm, (21) is a cone portion, (22) is a coil bobbin portion, (23) is a plurality of reinforcing plates, (23).
a) is a groove, and the above is the same as that of the first embodiment. (twenty five)
Is between the surface of the coil bobbin (22) and the surface of the reinforcing plate (23) to which the lead wire (7) is inserted and fixed, and between the two adjacent reinforcing plates (23) at the opposite positions. An arc-shaped metal rod fixed to a bridge by inserting the ends into small holes provided on the side surface of the reinforcing plate (23) so as to be parallel to each other constitutes a rod-shaped balancing member.

With the above construction, the metal rod (25), which is a balancing member, is separated from the surface of the coil bobbin (22), so that the moment is large, and the weight is lighter than that of the first embodiment. . In addition, since the metal rod (25) is installed parallel to the surface of the coil bobbin portion (22), the mass balance can be widened in the lateral direction as compared with the first embodiment.

[0018]

As described above, according to the present invention, the lead wire of the voice coil wire is inserted and fixed in the grooves of some of the plurality of reinforcing plates provided at the boundary between the coil bobbin portion and the cone portion. As a result, the leader angle of the leader line is close to the angle of the diaphragm shape and can be easily routed, and the length of the leader line that can be freely wired is also shortened, preventing mechanical breakage of the leader line and making it durable. There is an effect that an integrated speaker diaphragm having excellent properties can be obtained at low cost.

Further, since the step for positioning the voice coil wire is provided at the end portion of the reinforcing plate on the coil bobbin portion side, when the voice coil wire is wound around the coil bobbin portion, the positioning of the voice coil wire is facilitated and the manufacturing cost is reduced. While being reduced, there is an effect that the positional displacement of the voice coil wire at the time of high input is prevented.

Further, since a balance member for balancing the weight of the leader line is fixed to the reinforcing plate at the opposite side opposite to the reinforcing plate inserted and fixed in the groove, the mass imbalance due to the weight of the leader line is fixed. The effect is to obtain a high-quality integrated speaker diaphragm capable of maximizing the original performance capable of wideband reproduction with less eigen sound without rolling.

Further, since the rod-shaped balancing member is fixed in the groove provided in the reinforcing plate, there is an effect that no special structure is required for mounting the balancing member and the cost can be reduced.

Furthermore, since the rod-shaped body as a balance member is bridged in a position apart from the surface of the coil bobbin portion of the reinforcing plates at the opposite side positions so as to be parallel to this surface, the rod-shaped body is drawn out with a lighter weight. The effect is to be able to balance the weight of the wire.

[Brief description of drawings]

1 to 4 show Embodiment 1 of the present invention, FIG. 1 is a front view, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG.
2 is a partial cross-sectional view taken along the line III-III of FIG.
It is a fragmentary sectional view seen from the V line.

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

3 is a partial cross-sectional view taken along the line III-III in FIG.

4 is a partial cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is a front view showing a second embodiment of the present invention.

FIG. 6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a sectional view showing a conventional cone speaker.

[Explanation of symbols]

3 voice coil wire, 7 lead wire, 20 diaphragm, 21 cone part, 22 coil bobbin part, 23 reinforcing plate, 23a groove, 23b step, 24, 25 metal rod (balancing member).

Claims (5)

[Claims] 1. An integrated speaker diaphragm in which a cylindrical coil bobbin portion and a frustoconical cone portion are integrally formed, and a radial groove is provided at a boundary portion between the coil bobbin portion and the cone portion. A plurality of reinforcing plates provided at predetermined intervals in the circumferential direction are provided, and in some of the grooves of these reinforcing plates,
An integrated speaker diaphragm in which a lead wire of a voice coil wire wound around the coil bobbin portion is inserted and fixed. 2. The integrated speaker diaphragm according to claim 1, wherein a step for positioning the voice coil wire is provided at an end of the reinforcing plate on the coil bobbin portion side. 3. A balance member, which balances the weight of the lead wire, is fixed to a reinforcing plate at a position opposite to the reinforcing plate in which the lead wire is inserted and fixed in the groove. The integrated speaker diaphragm described. 4. The integrated speaker diaphragm according to claim 3, wherein the balancing member is a rod-shaped member inserted and fixed in the groove of the reinforcing plate. 5. The integrated speaker diaphragm according to claim 3, wherein the balancing member is a rod-like member which is bridged and fixed to a plurality of reinforcing plates so as to be separated from the surface of the coil bobbin and parallel to the surface.