JPS6128279B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method of manufacturing a speaker diaphragm,
In particular, the present invention relates to a method of manufacturing a speaker diaphragm having a core body such as a honeycomb core.

In recent years, due to the large ratio between shear modulus and density, a so-called honeycomb core 11 having a hexagonal column shape as shown in FIG. A compact diaphragm 10 has been proposed.

In this case, to form the honeycomb core 11,
As shown in FIG. 2, one ribbon 20 is divided into sections 20a and 20b along one side of a hexagonal prism, and adhesive is applied to section 20a, for example. A plurality of such ribbons 20 are prepared and bonded together, and then bent along dotted lines 21 that serve as boundaries between sections to form a hexagonal shape between each ribbon.

Alternatively, adhesive may be applied to the sheet body in a so-called checkerboard pattern, a plurality of sheets may be stacked and bonded together, and then cut to a width necessary for the thickness of the diaphragm.

In any case, in this type of diaphragm, in order to increase the internal loss of the diaphragm, if it is necessary to impregnate the diaphragm with a control agent such as mortite or a polymer material, the bonded portion 20a ( It was not possible to carry out this kind of impregnation in FIG. 1a, b). Further, simply applying a damping agent to the sheet body does not provide a uniform thickness layer, which adversely affects the vibration of the diaphragm.

The present invention was made in an attempt to eliminate the above-mentioned drawbacks of the prior art, and provides a method for manufacturing a speaker diaphragm that can easily impregnate a core body or a sheet body with a uniform and appropriate amount of damping agent. The purpose is to provide.

To achieve this objective, according to the invention:
A continuous body consisting of a plurality of core bodies of the same shape,
In the manufacturing method of a speaker diaphragm, the speaker diaphragm includes a sheet-like body in which the continuous body is sandwiched between the top and bottom in the thickness direction, and the continuous body is formed in a step before manufacturing the continuous body, and the sheet-like body is As for the shaped body, a layer for impregnating the damping agent on the surface of one or both of each core body and the sheet-like body of the continuous body may be formed in advance before being combined with the continuous body. Make it.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 3 shows a sheet body 30 corresponding to, for example, the sheet body 13 of FIG. 1, and according to the present invention has three layers. That is, an impregnable second layer 32 of Japanese paper, cloth, etc. is prepared for a first layer made of a film of aluminum alloy material, beryllium alloy material, titanium alloy material, or the like.

By applying a damping agent to the impregnated layer 32, which is the second layer, it is possible to form layers of the control agent with the same thickness. It is desirable that the layer containing this damping agent has a thickness of about 30% of the thickness of, for example, the first layer of the sheet body.

The first layer 31 is
A third layer 33 similar to the above is laid. Incidentally, depending on the case, the damping agent may be impregnated later. In this case, a large number of small holes may be provided in the third layer 33, or the third layer 33 may be impregnated with the damping agent.
3 may be made into a mesh shape. Further, in some cases, the third layer 33 may not be provided.

According to this invention, the sheet body having such an impregnable layer is manufactured before being combined with the continuous body. Impregnation of the impregnable layer with the control agent may take place before or after combination with the continuous body.

Further, it is necessary to apply the above two-layer or three-layer structure to the honeycomb core 40 of the continuous body as shown in FIG. That is, a damping agent layer 42' is located on the inner surface of each surface 41 constituting the core body 40, and a surface 43 made of the same material as the surface 41 is provided on the further inner surface of the damping agent layer 42'. In this case as well, if necessary, holes may be provided in one or both of the surfaces 41 and 43, or a net-like structure may be formed, or a two-layer structure may be formed.

A continuous body having such a core body 40 is manufactured as follows. As shown in FIG. 5, a first layer 41 of a non-impregnable sheet made of a material such as metal, plastic or paper, and a second layer 42 of a similar impregnable sheet made of Japanese paper, cloth, etc. Prepare. A damping agent is then applied to this second layer 42 to form a layer 42' of damping agent of uniform thickness.
This layer 42' preferably has a thickness of about 30% of the thickness of, for example, the first layer of the sheet body.

The second layer 42 (or 42') thus formed
A third layer 43 similar to the first layer 41 is laid down. Note that the damping agent may be impregnated after forming the third layer 43. In this case, the third layer may be provided with a large number of small holes, or the third layer 33 may be formed into a mesh shape.

Here, the surface of the third layer 43 of the sheet body is further divided into rectangular shapes corresponding to the height h and width w of the core body,
Adhesive is applied to each part in a so-called checkerboard pattern. A plurality of such sheets are laminated and finally cut along a line 50. Each cut is unfolded and folded to form a honeycomb-like series having a layer impregnated with damping agent. In this case, the lamination may be performed in such a number that each cut piece constitutes one diaphragm, or the cut pieces may be further laminated to form one diaphragm.

In the above description, a diaphragm having a structure in which a continuous body consisting of a honeycomb core is sandwiched between sheet bodies in a sandwich-like configuration has been described, but the core of the continuous body does not have to be in the shape of a hexagonal column but may have any shape. Moreover, although the continuous body and the sheet body may be formed separately, one sheet body may be formed integrally with the continuous body.

FIG. 6 shows a diaphragm 60 in which the core body is shaped into an equilateral triangle in order to compensate for the drawbacks of the honeycomb core shape, and one of the sheet bodies is integrally molded with the continuous body. That is, each core body 61 has an equilateral triangular upper cross section, and the bottom portion 62 of the core body 61 defining a plane is formed integrally with the core body 61. The bottom portion 62 is not molded as a sheet, but defines a single plane, so this case is also referred to as a sheet-like body. If we take a longitudinal section of this core body 61, it is as shown in FIG.
b, 61c and the bottom sheet-like body 62 are continuous. The present invention can also be applied to such a diaphragm.

By configuring this invention as described above,
It is possible to provide a method for manufacturing a speaker diaphragm in which a continuous body or a sheet body including a core body can be easily impregnated with a uniform and appropriate amount of damping agent.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view a and a partially top view b of a diaphragm having a honeycomb core, Fig. 2 is an explanatory diagram of the method for manufacturing the diaphragm of Fig. 1, and Figs. 3 and 4 are A partially cutaway perspective view of an embodiment of the invention, FIG. 5 is an explanatory diagram of the manufacturing method according to the invention, and FIGS. 6 and 7 are
The figures are a partially cutaway perspective view and a partially sectional view, respectively, of other embodiments of the present invention. 10, 60... Vibration plate, 11, 61... Continuous body, 12, 13, 30, 62, 63... Sheet-like body, 32, 42... Impregnated layer, 50... Cutting line.

Claims (1)

[Claims] 1. A method for manufacturing a speaker diaphragm comprising a continuous body made of a plurality of core bodies of the same shape, and a sheet-like body disposed between the continuous bodies from above and below in the thickness direction. , one or both of each core body of the continuous body and the sheet-like body in the step before manufacturing the continuous body, and in the stage before combining the sheet-like body with the continuous body. A method of manufacturing a speaker diaphragm, comprising forming in advance a layer for impregnating a damping agent on the surface of the speaker diaphragm.