JPH0240691A - Manufacture of resonance body - Google Patents

Abstract

PURPOSE:To obtain a vibration device which has large acoustic vibration generation area and reproduces a powerful low-frequency sound by bending and arranging a flexible tube on a foamed original liquid penetration preventive layer with elasticity on the top surface of a foamed body, putting this constitution body in a foaming jig, and injecting and foaming foamed original liquid in the space formed above the constitution body. CONSTITUTION:The foaming jig 14 consists of a flat plate type top mold 14a and a dish type bottom mold 14b and a cut material 16 such as urethane foam is charged in the recessed part of the bottom mold 14b. At this time, an elastic urethane film 18 is laminated previously on the top surface of the cut material 16 to obtain a function for preventing the penetration of the foamed original liquid. Then a bellows type flexible tube 22 formed of polypropylene, vinyl chloride, etc., and a driver unit 30 are positioned and mounted on the film 18 and the tube 22 is bent over the entire surface of the film 18. Here, the overall length of the tube 22 is 1-5m and a speaker is incorporated in the unit 30. Then the top mold 14a is mounted and the urethane foam molding body 28 is charged in the upper space.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a resonant resonator used in an acoustic vibration device that simultaneously generates sound and vibration.

[Prior Art] A conventional acoustic vibration device is disclosed in Japanese Utility Model Application Publication No. 51-123793.

This device is in the form of a chair with a seat and a backrest made of cushioning material, and speakers are attached to the backs of the seat and backrest through rigid diaphragms, respectively.

A person sits on a seat and leans his or her back against the backrest. When an electrical signal containing music or the like is input to a speaker, this electrical signal is converted into acoustic vibrations. This acoustic vibration is transmitted to the human body via the diaphragm and the cushion material. A person sitting on the seat can experience music etc. not only through the ears but also directly as vibrations.

[Problems to be Solved by the Invention] The conventional acoustic vibration devices described above transmit the acoustic vibrations generated by the speaker to the human body through a diaphragm made of a rigid body. As a result, it was necessary to arrange a large number of diaphragms and to attach a speaker to each diaphragm. Furthermore, since the diaphragm is difficult to resonate at low frequencies, there is a problem in that the bass range lacks impact.

In order to solve the above problems, it is conceivable to bury a bent flexible tube in a cushion material and drive the resonance of the air column inside the long tube with a speaker.

However, when manufacturing a resonance resonator by sandwiching a bent flexible tube between cut foam materials, a gap is created between the tube and the foam, so when the tube vibrates, the foam It is hit and a noise is generated.

[Object of the Invention] In view of the above-mentioned problems, the present invention provides a method for manufacturing a resonant resonator that can realize an acoustic vibration device that can reproduce large and powerful bass sounds with a clear acoustic vibration generation surface and that does not generate noise. The purpose is to provide a method.

[Means for Solving the Problems] The method for manufacturing a resonant resonator of the present invention uses a foaming jig in which a flexible tube is bent and arranged on an elastic foaming solution permeation prevention layer on the upper surface of a foaming body. A resonant resonator with a structure in which the foam is closely attached to the outer circumferential surface of a flexible tube is obtained by preparing a foaming solution inside the foaming jig and injecting the foaming solution into the remaining upper space of the foaming jig and foaming it. It is.

In addition, after loading the foam having the foaming solution penetration prevention layer into the foaming jig, the flexible tube may be bent and placed on the penetration prevention layer, or the foaming solution penetration prevention layer of the foam may be preliminarily placed on the penetration prevention layer. A flexible tube may be bent and positioned and adhered thereon and then loaded into the foaming jig.

[Operation] The foaming stock solution injected into the foaming jig covers the outer peripheral surface of the flexible tube during foaming, and solidifies while in close contact with the outer peripheral surface of the flexible tube. The solidified top foam adheres to the bottom foam through the anti-penetration layer. Moreover, this permeation prevention layer prevents the foaming stock solution from permeating into the foam that has been previously loaded into the foaming jig, and prevents the formation of a hard layer that would otherwise occur if the foaming solution permeated.

In the resonant resonator manufactured as described above, since the foam is in close contact with the outer peripheral surface of the tube, the tube and the inner layer of the foam vibrate together without generating noise.

[Example] Hereinafter, the present invention will be explained in detail based on FIGS. 1 to 3.

The foaming jig 14 includes a flat upper mold 14a and a plate-shaped lower mold 14.
It consists of b. As shown in FIG. 1, a cut material 16 of urethane foam is loaded into the recess of the lower die 14b. An elastic urethane film 18 is laminated on the upper surface of the cut material 16 in advance. This film 18
can prevent penetration of the foaming stock solution.

Next, as shown in FIG. 2, the flexible tube 22 and the driver unit 30 are positioned and placed on the urethane film 18.

The flexible tube 22 is a bellows-shaped tube made of polypropylene, vinyl chloride resin, or the like, and its outer peripheral surface has been previously subjected to surface treatment to improve adhesion to the urethane foam that will be foam-molded later. . Examples of adhesive strength improvement treatments include primer coating treatment and surface treatment using plasma, corona, or the like. This flexible tube 22 is bent over almost the entire surface of the urethane film 18. Note that the appropriate total length of the tube 22 is 1 to 5 m. Both ends of this tube 22 are connected to two connecting pipes 31 and 32 that protrude from a sealed box-shaped driver unit 30, respectively. Thereby, the internal space of the flexible tube 22 communicates with the inside of the driver unit 30. The driver unit 30 has a built-in speaker.

Note that the flexible tube 22 is bent and positioned and glued on the urethane film 18 on the upper surface of the urethane foam cut material 16, and this cut material 16 is attached to the lower die 14b.
It can also be loaded inside. The same applies to the driver unit 30.

Next, as shown in FIG. 3, after the foaming jig 14 is closed by covering the lower mold 14b with the upper mold 14a, a urethane foaming stock solution is poured into the foaming jig 14 and foamed. As a result, the remaining space within the foaming jig 14 is filled with urethane foam. At this time, the foaming stock solution is transferred to the flexible tube 14.
Covers the outer circumferential surface of the material and solidifies in close contact with it. The solidified urethane foam molded body 28 is adhered to the urethane foam cut material 16 via the urethane film 18. Moreover, the urethane film 18 prevents the foaming solution from permeating into the interior of the cut material 1B, and prevents the formation of a hard layer that would otherwise occur if the foaming solution permeates.

Through the above steps, a resonant resonator IO having a built-in driver unit 30 is manufactured.

FIG. 4 shows a plan view of this resonant resonator IO.

In this resonance resonator 10, the bent shape of the flexible tube 22 is held by the urethane foam molded body 28 that is in close contact with the outer peripheral surface of the flexible tube 22. Moreover, since this resonant resonator 1O has a built-in driver unit 30 connected to the flexible tube 22, it can be used as it is as an acoustic vibration device 34.

The driver unit 30 causes resonance of the bent flexible tube 22, and a large acoustic vibration generation area is obtained. Because it utilizes the resonance of long air columns, it is capable of highly efficient transmission of deep bass sounds. Furthermore, since the urethane foam molded body 28 is in close contact with the outer peripheral surface of the flexible tube 22, the tube 22 and the inner layer of the urethane foam molded body 2B vibrate together without generating noise. Further, due to the urethane film 18's effect of preventing penetration of the foaming solution, a hard layer is not formed inside the urethane foam cut material 16, so the cushioning property when the human body touches it is good, and the feel is good.

Note that instead of laminating the urethane film 18 on the upper surface of the urethane foam cut material 1G, a high-density urethane foam layer formed on the surface during the production of the urethane foam can be used as a layer to prevent permeation of the foaming solution. In this case, simply by cutting the manufactured urethane foam with skin, a urethane foam cut material having an elastic foaming solution permeation prevention layer can be obtained, and manufacturing costs can be reduced. By omitting the surface treatment of the flexible tube 22 and adjusting and setting the composition of the foaming stock solution, the flexible tube 22 is made by the elasticity of the urethane foam molded body 28.
It may also be possible to achieve close contact with. Injection and foaming may be performed with both ends of the flexible tube 22 taken out from the foaming jig 14 to produce a resonant resonator IO, and the driver unit 30 may be externally attached to this to form the acoustic vibration device 34.

[Effects of the Invention] According to the method for manufacturing a resonant resonator according to the present invention, a resonant resonator having a structure in which a foam is formed integrally with a flexible tube arranged in a bent manner and the foam is closely attached to the outer peripheral surface of the tube is produced. Therefore, it is possible to realize an acoustic vibration device that has a large acoustic vibration generation area, can reproduce powerful bass sounds, and does not generate noise.

Furthermore, due to the action of the elastic foaming solution permeation prevention layer, a hard layer is not formed inside the foam that is loaded into the foaming jig first, so it provides good cushioning properties when it comes into contact with the human body. A resonant resonator with a good feel can be obtained.

[Brief explanation of the drawing]

Figure 1 shows a state in which a cut material of urethane foam with a urethane film laminated on the upper surface is loaded into a foaming jig in the step of the method for producing a resonant resonator according to an embodiment of the present invention. 2 is a plan view showing the flexible tube and driver unit positioned and placed on the urethane film in the foaming jig shown in the previous figure, and FIG. 3 is a cross-sectional view of the foaming jig shown in the previous figure. FIG. 4 is a cross-sectional view showing the completed state of foaming after the tool is closed. FIG. 4 is a plan view of the resonant resonator with a built-in driver unit taken out from the foaming jig shown in the previous figure. Explanation of symbols 10... Resonant resonator 14... Foaming jig 16... Urethane foam cut material 18...
... Urethane film 22 ... Flexible tube 28 ... Urethane foam molded body 30 ...
...Driver unit 34...Acoustic vibration device Fig. 1 Fig. 2

Claims (1)

[Claims] 1. A flexible tube is prepared in a foaming jig by bending it on the elastic foaming solution penetration prevention layer on the upper surface of the foam, and the foaming solution is poured into the remaining upper space in the foaming jig. A method for producing a resonant resonator, the method comprising forming a foam that adheres to the outer peripheral surface of a flexible tube by injecting and foaming.