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JPS56147599

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DESCRIPTION JPS56147599
1--Specification 1, title of the invention
Method of manufacturing speaker diaphragm
3. Detailed Description of the Invention The present invention provides a method for
continuously making a speaker diaphragm in which the physical properties of the cone or dome
and the edge are different. Currently, there are two types of loudspeaker diaphragms. One type is
a free-edge type in which the cone part and the edge part are made separately, and then the cone
part and the edge part are bonded, and the other type is a single mesh paper mesh with a cone
part and an edge part. Is a fixed tie, which is made by changing the roughness of the The abovementioned free edge type has a large number of man-hours and costs, and it is characterized by
the disadvantage that the cone portion and the edge portion are separately formed and adhered.
On the other hand, in the case of the fast-stitch type, although the number of processes is low
and the cost is low, since the division can not be accurately performed, there is a drawback that
the product variation is large and it can be used only for general purpose speakers not
emphasizing sound quality. The present invention eliminates the above-mentioned conventional
drawbacks, EndPage: 13. Examples of the present invention will be described below. Example 1
High density polyethylene fibers and carbon fibers with a fiber length of 6 μm and a diameter of
10 μ are mixed at a weight ratio of 85:15 L, and the surface density is 1 oo 'ir' /; t, to form a 260
p thick composite sheet. As shown in FIG. 1A, this composite sheet 1 is fed to the lower part of a
cylindrical grindstone 2 having the same width as the edge portion of the diaphragm to be
produced, and this grindstone 2 is lowered to make the composite sheet 1 and while rotating at a
rotational speed of 100 Or · p−m, a ring-shaped groove 3 is formed on the upper surface of the
composite sheet 1 as shown in FIG. 1B. The ring-shaped groove portion is a portion to be an edge
portion, and the central portion surrounded by the groove 3 is a portion to be a cone portion. As
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shown in FIG. 1C, the composite sheet 1 in which the grooves 3 are formed as described above is
supplied L between the far infrared heaters 4 and 4 ', and the composite sheet 1 is heated at 180
° C. for 3 seconds. The density polyethylene fiber is melted and immediately cold-pressed with a
mold 6.6 'as shown in the first plan to form a cone-shaped diaphragm 6 as shown in FIG. 1E. In
this moving plate 6, the thickness of the cone portion 7 is thick and the thickness of the edge
portion 8 is thin, and the physical properties required for the cone portion and the edge portion
can be obtained. By continuously performing the above steps, a large number of diaphragms 6
can be formed on the long composite sheet 1. The outer peripheral part of the edge part 8 of the
said diaphragm 6 is cut | disconnected 1-a cone-shaped diaphragm is manufactured. [Example 2]
As shown in FIG. 2A, the first sheet 9 of surface density 40r /, 2 where high density polyethylene
fiber and acrylic fiber (fiber length 10 mm) are mixed at a weight ratio of 60:40. 2C, the
laminated sheet 11 shown in FIG. 2B is obtained by laminating the second sheet 1o having an
areal density of 6 o 7 / m 2 in which the high density polyethylene fiber and the carbon fiber are
mixed at a weight ratio of 8i: 15. As shown, a ring-shaped groove 3 is formed as shown in FIG. 2D
by feeding the lower part of the cylindrical grindstone 2 and lowering the grindstone 2 to contact
the laminated sheet 11 and rotating it. I'm sorry.
This laminated sheet 11 is described above in Example 5. 1) and after being heated in four
modes, cold pressing is performed to manufacture a cone-shaped diaphragm. FIG. 3 shows sound
pressure frequency characteristics of a speaker using c of a conventional free-edge type coneshaped diaphragm a and the diaphragms c and c of the above-mentioned first embodiment and
second embodiment, according to the manufacturing method of the present invention The
speaker using the manufactured diaphragm can obtain the same characteristics at half the cost
as compared with the conventional free-engagement type. Although the above embodiment is a
cone-shaped diaphragm, it is not limited to a cone, and may be a dome-shaped diaphragm, and
may be a diaphragm using a metal sheet. The physical properties of the edge portion and the
cone portion or the dome portion can be optimized optimally in a simple manufacturing process.
The U1 plate is obtained.
4. Brief description of the drawings The first is a diagram showing the manufacturing process of
the diaphragm for SPD-force in one embodiment of the present invention, the diagram showing
the manufacturing process of the embodiment of the present invention, FIG. 3 is a sound
pressure frequency characteristic diagram of a speaker using a diaphragm manufactured by the
manufacturing method of the present invention and a speaker using a conventional diaphragm. 1
· · · Composite sheet, 2 · · · · · · · · · · · · · · · Grooves, 4.4 '· · · · · Far infrared heater, 5 · · · Gold Type, 6
· · · · · · · · · · · · · · · · · · · · · cone portion, 8 · · · · · · · · · · · · · 10 · · · · · · · · · · · · · · · · · · · Laminated sheet.
Name of agent Attorney Nakao Toshio et al. 1 person EndPage: 2 Fig. 1 (E) Fig. 2 (C) (D) Fig. 3Singing Song EndPage: 3
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