JPH0237759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker diaphragm and a method for manufacturing the same, and more particularly to a speaker diaphragm for medium or high-pitched sounds and a method for manufacturing the same.

Conventional speaker diaphragms have been manufactured by punching or foaming a flat plate of foam, such as styrofoam, into a disk shape, and then attaching surface plates to both sides of the disk.

Although this method is easy, it has the disadvantage that the vertical rigidity of the speaker diaphragm is not high. Also,
The method for manufacturing a speaker diaphragm using a honeycomb core is the same as above, but in this case, the speaker diaphragm has high rigidity in the vertical direction, but the surface plate is bonded while maintaining the uniform shape of the cells of the honeycomb core. In addition, it is difficult to do so, and the adhesion area is extremely small.Furthermore, if the surface plate is thin, the surface plate may cause resonance depending on the cell dimensions of the honeycomb core.

The present invention has been made in view of the above, and an object of the present invention is to provide a speaker diaphragm that eliminates the above drawbacks, has high rigidity in the vertical direction, and can be easily manufactured, and a method for manufacturing the same. It is.

The present invention will be explained below with reference to Examples.

FIG. 1a is a cross-sectional view showing a first embodiment of the speaker diaphragm of the present invention. 1 is a planar member, for example, made of a thin aluminum plate,
It is spirally wound to form a coil with a predetermined interval between opposing surfaces, and its tip is fixed to the surface of the wound flat plate member 1. On the other hand, a flat plate-shaped foam body 2 having a thickness approximately equal to the predetermined interval is inserted into a space formed between the surfaces of the wound flat plate member 1, and the foam body 2 and the flat plate member 1 are The contact surfaces of the two are fixed to each other with an adhesive or the like to form a core A, and the core A itself forms a speaker diaphragm.

The speaker diaphragm of this embodiment configured as described above has high rigidity in the vertical direction due to the presence of the flat plate member 1.

Next, a second embodiment of the present invention will be described.

In the first embodiment described above, a surface plate 3 or 4 is provided on one surface of the core A shown in FIG.
Either the two surfaces of the core A are adhered to form a speaker diaphragm, or the surface plates 3 and 4 are separately adhered to both surfaces of the core A to form a speaker diaphragm.

In addition, in the first embodiment, the case where the core A was constructed by adhesively filling the foam 2 between the opposing surfaces of the flat plate member 1 wound in a spiral manner was explained as an example. A trapezoidal cross-sectional foam 5 having a height equal to the length between opposite surfaces of the spirally wound flat plate member 1 is inserted between the spirally wound flat plate members as shown in FIG. The core B may be formed by bonding the body 5 and the flat plate member 1. In this case, since there is a space between the five volumes of foam, the surface plates 3 and 4 are individually adhered to both surfaces of the core material B to form a speaker diaphragm without omitting the surface plate. In this case, the speaker diaphragm is a speaker diaphragm similar to a speaker diaphragm using a conventional honeycomb core, and is lightweight due to the empty portion.

Although the flat plate member 1 is an aluminum plate in the first and second embodiments, other thin metal plates such as titanium plates or paper strips may be used.

Next, a method for manufacturing a speaker diaphragm according to the present invention will be explained.

FIG. 3 is a diagram for explaining an embodiment of the method for manufacturing a speaker diaphragm according to the first embodiment of the present invention.

As shown in the cross-sectional view in FIG. 3a, the foam 8 is adhered to a thin flat plate member 7, and the flat plate member 7 to which the foam 8 is adhered is placed in a spiral shape with the flat plate member 7 side facing outside. Wind it as shown in Figure b. This winding is
The contact surfaces of the foam 8 and the flat plate member 7 are bonded together with an adhesive or the like, thereby forming a cylindrical core material C as shown in FIG. 3c. The core material C shown in Fig. 3c is shaped into a short cross-sectional shape as shown in Fig. 3d.
As shown in Figure e, a core D is formed by cutting into rings, and this core D itself is used as a speaker diaphragm. Further, to explain the method of manufacturing the speaker diaphragm according to the second embodiment of the present invention, the surface plate 3 or 4 is bonded to one surface of the core D to form a diaphragm, or the third As shown in FIG. f, surface plates 3 and 4 are individually adhered to both surfaces of the core D to form a speaker diaphragm.

In addition, when cutting the core material C into rounds to obtain the core D, the core D' has a cross section that is a combination of a square and a triangle, or the cross section is a square and a trapezoid, as shown in Figure 3 g or h. Integrated core
It is also possible to cut the core D' or D'' into a predetermined cross-sectional shape so that the core D' or D'' itself becomes a speaker diaphragm, or glue a surface plate to either surface, or As shown in f, surface plates are adhered to both surfaces to form a speaker diaphragm.

Next, a modification of the manufacturing method of the present invention will be explained.

It is also possible to produce the foam in the same manner as described above by using a foam whose density is different for each predetermined range as the foam 8 in FIG. 3a and winding it as shown in FIG. 3b.

In this case, the low-density portion of the foam 8 contracts, making it easier to wind into a coil, and the density of the foam in the wound coil-shaped core material C can be made uniform.

Next, as shown in FIG. 4, a trapezoidal foam 9 is adhered to the flat plate member 7, and the foam 9 is wound into a coil shape as shown in FIG. 3b, thereby producing the same as described above. In this case, the trapezoidal shape formed by the foam 9 is selected and bonded so that when the foam is wound into a coil, a space is created between the foams 9.

Note that the flat plate member 7 in the explanation of the manufacturing method described above may be an aluminum plate, a titanium plate, or paper.

Further, instead of the foams 2, 5, 8, and 9 described above, other flexible materials that are normally used for the diaphragm of soft dome speakers may be used.

As explained above, the speaker diaphragm of the present invention has higher rigidity in the vertical direction than the conventional speaker diaphragm that uses a foam core, and also has a higher rigidity in the vertical direction than the conventional speaker diaphragm that uses a honeycomb core. Compared to the above, the adhesive area with the top plate is increased, making the bonding easier, and there is almost no resonance in the top plate.

Further, according to the method for manufacturing a speaker diaphragm of the present invention, the above-described speaker diaphragm of the present invention can be easily manufactured.

[Brief explanation of drawings]

FIG. 1a is a cross-sectional view of a first embodiment of the speaker diaphragm of the present invention, and FIG. 1b is a side view of a second embodiment. FIG. 2 is a cross-sectional view showing a modification of the embodiment of the speaker diaphragm of the present invention. FIGS. 3a to 3h are explanatory diagrams illustrating an embodiment of the method for manufacturing a speaker diaphragm according to the present invention. FIG. 4 is an explanatory diagram illustrating a modification of the embodiment of the method for manufacturing a speaker diaphragm according to the present invention. 1, 7... Flat plate member, 2, 5, 8, 9... Foam, A, B, D, D', D''... Core.

Claims (1)

[Scope of Claims] 1. A flat plate member that is spirally wound and formed in a coil shape with a space between opposing surfaces, and a flat plate member that is filled and inserted into the space between the wound flat plate members. A speaker diaphragm comprising: a foam bonded to a foam; 2. A flat plate member that is spirally wound and formed into a coil shape with a space between opposing surfaces, and a foam that is inserted into the space between the wound flat plate members and adhered to the flat plate member. What is claimed is: 1. A speaker diaphragm comprising: a core consisting of a core; and a surface plate adhered to at least one of opposing surfaces of the core. 3. A speaker diaphragm characterized in that a foam is bonded to one surface of a flat plate member, the contact surface is bonded and wound to form a coiled body, and the coiled body is sliced into a predetermined cross-sectional shape. manufacturing method. 4 Adhere a foam to one surface of a flat plate member, and wind it while adhering the contact surface to form a coiled body.The coiled body is sliced into a predetermined cross-sectional shape to form a core. 1. A method of manufacturing a speaker diaphragm, the method comprising: adhering a surface plate to at least one of the surfaces of the speaker diaphragm.