JPH02146898A - Compressed vibrator - Google Patents

Abstract

PURPOSE:To produce lots of vibrators with uniform thickness and to improve the mechanical strength by inserting a pre-formed woven cloth into a specified injection mold pressing die, pressing a molten synthetic resin from a gate and solidifying the resin. CONSTITUTION:Male and female dies of injection mold metallic dies 3a, 3b, are provided separately with a heater, and in the case of the fitting of the male dies 3a, 3b, the outer circumferential part 6b is fitted closely and the central part 6a of the vibrator is provided with the same gap t' as a finished thickness (t) of the vibrator 1a. After a pre-formed woven cloth 2 is inserted to the metallic dies 3a, 3b, a molten synthetic resin is pressed from a gate 9, and the resin is solidified and formed. Thus, lots of vibrators with uniform thickness are produced and the pattern of the core textile is left onto the forming as it is, excellent design is attained and the value of the commodity is improved. Moreover, strong mechanical strength is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a vibrating body of a speaker in which a pre-shaped woven fabric is used as a core material and is molded and solidified with a synthetic resin.

<Conventional technology> Conventionally, this type of technology was seen in cone-shaped, dome-shaped, etc.-shaped vibrating bodies before the war, but it was possible to impregnate woven fabrics such as silk or cotton with phenolic resin, The material was then pressed and molded using heated male and female molds, cooled, and molded into the shape of the mold.

<Problem to be solved by the invention> However, in the diaphragm completed through the manufacturing process described above, the viscosity of the phenol resin is low, so the amount of impregnation into the core material such as silk or cotton cloth is small. It was not possible to obtain a large bulky diaphragm.

Therefore, as a diaphragm for a speaker that vibrates with high output and large amplitude, the outer shape is easily distorted and it is easy to break.

Also, the edges are hard, so it has a large amplitude and low f.

The diaphragm was also difficult to obtain.

In addition, since the elongation rate of the material was small, it was easy to tear due to the pressing force of the mold during manufacturing.

Means for Solving the Problems> The present invention is a completely new invention that eliminates the above-mentioned drawbacks.The structure of the present invention will be explained using FIGS. 1 to 5 corresponding to the embodiments. Injection mold press die (3a), (:Th), in which the outer peripheral part (1b) is tightly attached and the vibrating part (1a) is formed with the same gap (L゛) as the finished thickness (1), is placed in advance. Molded woven fabric (2)
After fitting into the pressing molds (3a) and (3b), molten synthetic resin is press-fitted through the sprue (9), solidified, and molded.

<Function> The injection male hot mold (3M), (3b) has the outer peripheral part (6b) tightly fitted with no gap, and the central vibrating part (6a
), the same gap (t') as the finished thickness (1) of the vibrating part of the product is maintained, so that the core material cloth 2) is clamped and fixed at the outer peripheral part (6b) of the close contact part. When the cloth (2) is pulled inward, the molten resin permeates into the cloth fiber structure.

<Example> Embodiments of the present invention will be described below based on the drawings.

1 to 5121 are diagrams showing embodiments of the present invention, and a cone-shaped vibrating body will be explained based on the embodiments shown in FIGS. 1 to 3.

(1) is a vibrating body, (1a) is a vibrating part, (1b) is an outer peripheral part, and (4) is a core fabric such as glass wool.

(3a) and (3b) are equipped with separate heating devices for the male and female injection molds. (9) is an injection port for sealing the molten resin. Male cod type (3a)
, (3b), the outer peripheral part (6b) is in close contact, and the part (6a) of the central vibrating part has a gap (1) that is the same as the finished thickness (1) of the vibrating part (1a) of the vibrating body (1). 1> is provided.

Injection heating male cod mold (3a), (3b)
Or a fabric (1a) woven from glass fiber or glass wool in the warp and/or weft between separate molds.
Press only the molds (3a) and (3b) to shape the outer shape in advance, or subsequently set it in the heated injection molds (3a) and (3b) and heat it to about 200°C or higher. Inject thermoplastic synthetic resin such as polyimide that is melted by the high temperature.

The outer periphery of the core fiber (2) is pressed, and the vibrating part (1a) is pulled by the male and female presses (3a) and (3b), and is melted at about 200°C or higher under tension. The thermoplastic synthetic resin such as polyimide permeates into the fiber structure of the core material (2) and hardens to the same thickness (t') as the finished thickness in the gaps between the molds (3g>, (3b)). .

At this time, the pressing force of the molds (3a) and (3b) is applied according to Pascal's principle, and since each part of the resin (2) of the vibrating body (1) is pressurized, the pressure is constant, so it is uniform throughout. Pressure is applied to the vibrating body (1), and the state of resin adhesion becomes uniform on all parts of the vibrating body (1).

Since the gap (L') between the molds (3a) and (3b) corresponds to the finished thickness (1) of the vibrating body (1), even under strong pressure, the finished thickness (1) of the synthetic resin can be achieved.

The finished state of the vibrating body (1) exhibits a smooth surface, and the pattern (4) of the cloth fibers (2) appears on the surface, giving it an excellent aesthetic appearance.

In this way, the present invention provides a method for determining the type of core fiber (2), n, ai
There is a great deal of freedom in selecting the method of processing, type of resin, processing temperature, etc. as appropriate.

For example, as shown in Fig. 1(b), the shape of the core fabric (2) is made of a synthetic resin (5
When the core material is impregnated with a) to maintain its shape and the outer side is fused with a highly rigid synthetic resin (5b), the core material fiber (2), the synthetic resin (5a), and the synthetic resin 5a), ( 5b)
have good mutual fusion properties, and a uniform vibrating body (1) can be obtained. Moreover, breathability can be maintained while maintaining the shape of the fiber (2) as needed.

When this diaphragm was assembled into a speaker, the edge portion was made of the same material as the diaphragm of the present invention in order to maintain compliance, and since it was difficult to use the same material, synthetic rubber material was applied, for example, as shown in Fig. 3. The edge part (19) etc. are manufactured separately and attached to the outer periphery of the vibrating part (1), and the voice coil <
20), the damper (21), etc. are glued on to complete the vibration system.

The diaphragm of the speaker to which the present invention can be applied includes the above-mentioned cone-shaped diaphragm, as well as various shapes such as the dome shape shown in FIG. 4 or the flat plate shape (for example, Kamabolo shape) shown in FIG. A vibrating body is obtained.

Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structure of these embodiments. It can be implemented with appropriate modification within the scope of achieving the following effects.

<Effects of the Invention> As is already clear from the above description, the vibrating body of the present invention has a structure of an injection mold in which the vibrating part is spaced apart and the outer periphery is in close contact with each other, so that the vibrating body of the present invention has a uniform thickness. It is possible to produce a large amount of vibrating bodies, and the pattern of the core fabric remains on the finished product, giving it a beautiful design and increasing its commercial value.

When assembled into a speaker, when the edge portion is attached, the outer periphery is raised thinly, so it has various effects such as being mechanically strong.

[Brief explanation of the drawing]

The drawings are all diagrams of embodiments of the present invention, and are shown in FIG. 1(a).
) is a sectional view of a cone-shaped vibrating body, FIG. 1(b) is a partially enlarged sectional view of FIG. 1(a), and FIG. 2 is a sectional view of a pressing die.
FIG. 3 is a completed view, FIG. 4 is a sectional view of the dome-shaped vibrating body, and FIG. 5 is an external view of the flat plate (kamabolo-shaped) S moving body. In the figure, (1a) is the vibrating part, (1b) is the outer periphery, (2) is the woven fabric, (3a) and (31J) are the pressing mold, (9) is the sprue, (1) is the finished thickness, (1) is the gap. Figure 3 Figure 2 Figure 5

Claims (1)

[Claims] The outer peripheral part (1b) was formed in advance with injection mold pressing molds (3a) and (3b) in which the vibrating part (1a) was formed with a gap (t') the same as the finished thickness (t). The woven fabric (2) is pressed into the pressing molds (3a) and (3b).
A compressed vibrating body is formed by press-fitting a molten synthetic resin through a sprue (9) and solidifying it.