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Description 1, title of the invention
Method of manufacturing speaker diaphragm
3. Detailed description of the invention The present invention comprises an edge part with high
internal loss and a cone part with high elastic modulus, and in particular an edge page with little
edge resonance. It provides a method. There are two main types of speaker diaphragms. One is a
free edge type in which the cone portion and the edge portion are made of different materials,
and the other is a fixed type in which the cone portion and the edge portion are made of the
same material. The former free-edge type diaphragm has good frequency characteristics, but has
a large number of manufacturing steps, making it difficult to manufacture continuously at high
speed, and has the disadvantage of high cost. On the other hand, the latter fixed type is low in
cost because it can be continuously manufactured at high speed, but the cone portion and the
edge portion are formed of the same material, so there is a drawback that the edge resonance
appears sharply. The present invention provides a manufacturing method capable of
continuously manufacturing a diaphragm with less edge resonance at high speed. An
embodiment of the present invention will be described below. FIG. 1 shows a papermaking
apparatus. Reference numeral 1 denotes a tank in which a material 2 for an edge portion is
accommodated. A circular net 3 formed of a cylindrical net is rotatably supported by the tank 1
and a circular net 6 formed of a cylindrical net is rotated by the tank 4. It is supported possible.
On the outer peripheral surface of the circular net 6, as shown in FIG. 2, a mask 8 of about 200
.mu. In FIG. 1, reference numeral 9 denotes a cotton cloth which is wound on a roll, and the
cotton cloth 9 is run in the direction of the arrow. In FIG. 1, the material 2 for the edge portion is
attached to the outer peripheral surface of the circular net 3 which rotates once, and the material
2 for the edge portion further adheres to the lower surface of the cotton cloth 9. A sheet of 2 is
formed. The material for cone portion 6 adheres to the hole 7 of the mask 8 on the outer
peripheral surface of the circular mesh 6 which rotates in the same manner, and the sheet
formed into a circular shape adheres onto the sheet for the edge portion. FIG. 3 (6) shows a sheet
formed by the above-described sheet forming apparatus. In FIG. 3 (5), 1o is a sheet made of the
material 2 for the edge part, 11 is a circular sheet made of the material 6 for the cone part, and
this circular sheet 11 is attached on the above long sheet 10). It is 1C; is a guideline made of the
same material as a circular sheet, ie, a material for a cone part, and is formed simultaneously
with the circular sheet 11; In FIG. 1, 20.21 is a couch roll for sucking water of the hk sheets 1o
and 11 respectively, 22 is a water suction device, 23 is a squeeze roll, and the sheets 10 and 11
are dewatered and further dried. It is dried by machine 24 and wound up.
As shown in FIG. 3 (C), the sheet manufactured by the paper-making apparatus has a shape in
which circular cone sheet 11 is arranged in four rows on an edge sheet 10 made of an edge
material. . This sheet is cut as shown in FIG. 3 (I3) by a slitter with a light detection device. When
the sheet shown in FIG. 3 (5) is fed, the sheet meanders, but in this embodiment, the light
detecting device detects the guideline 1d and the sheet is cut following the meandering of the
sheet. As shown in FIG. 3 (B), accurate cutting can be performed. FIG. 3 (q shows the heating
step. In FIG. 3 (q. 12.12 'is a heating plate, and the surface of the square plate 12.12 is coated
with Teflon 13.13'. Reference numerals 14 and 14 'denote heaters disposed at the central
portion of the heating plate 12' 12 ', and 16.1i denotes a water pipe disposed annularly on the
outer peripheral portion of the heating plates 12 and 12'. The temperature of the central portion
of the heating plate 12, 12 'is high and the temperature of the outer peripheral portion is low,
and the heating plate 12' 12 'is held and heated. The sheets 1o and 11 are mainly made of
thermoplastic resin fibers, and the sheets 1o and 11 are softened by heating with the heating
plate 12.12 '. The surface temperature of the heating plate -12, 121 'is relatively high at the
center compared to the outer periphery according to the thickness of 10.110, so that the sheet
10 ° 11 softens uniformly. It is. FIG. 3 (c) shows the molding process. In FIG. 3 (C), 16 is a lower
mold and 17 is a mold, and the upper mold 17 has a central upper mold 1de corresponding to a
cone portion and an outer periphery of the central die mold 1de. EndPage: 2 is configured from a
cylindrical outer peripheral upper mold 11 slidably held on the surface. A spring 18 biases the
outer peripheral upper die 1 downward. The spring 18 may be omitted. As shown in FIG. 3 (C),
the sheet 10.11 which has been heated and softened is supplied between the mold 17 and the
lower mold 16, and the sheets 10 and 11 are held. At this time, first, a portion corresponding to
the edge portion of the sheet) 10 is held by the outer peripheral upper mold 11 and the lower
mold 16 and then the sheets 10 and 11 are formed by the central upper mold 17 ′ and the
lower mold 16. It is pinched. The thus softened sea) 10.11 is cold pressed to be formed into a
cone shape as shown in FIG. 3 (6). In the forming step shown in FIG. 3 it is also possible to use
the upper mold in which the cone and the edge are integrated, but in this case, the cone of the
upper mold is first pressed at the time of pressing. While the sheet 10, 110 may be stretched as a
result of contact with the sheet 10.11, wrinkles may occur as a result.
It is to be noted that the holes 19 are formed in the central upper mold 17 'in FIG. 3 (to the last)
because the formed sheet is lifted together with the upper mold 17 when the upper mold 1 rises
after pressing. It is used for air venting to prevent it from being deformed. FIG. 4 shows a state in
which the formed diaphragm portion is cut from the sheet 10. The edge portion is formed only
from the sheet 10, while the cone portion has a laminated structure of the sheets 10 and 11. It is
The central flat portion of the cone portion in FIG. 4 is cut and removed to complete the speaker
diaphragm. As the material for the edge portion in the above embodiment, a mixed material of
high density polyethylene synthetic pulp (80% by weight) and aramid fiber 2 m long (20% by
weight) is used, and as the material for corn portion, high density polyethylene synthetic pulp
(86 Although polyethylene is used as the thermoplastic resin fiber in the above-described
embodiment, it is possible to use not only polyethylene but also polypropylene,
polymethylpentene or the like. Further, although aramid fibers and carbon fibers are used as the
reinforcing material in the above embodiment, glass fibers, acrylic fibers, wood pulp and the like
may be used as well. The present invention is configured as described above, and according to
the present invention, the following effects can be obtained. (1) In order to use a sheet in which a
circular sheet for cone is laminated on a sheet for an edge portion and this sheet is mainly made
of thermoplastic resin fibers, this sheet is continuously subjected to a heating step and a cold
pressing step The diaphragm can be manufactured at high speed and continuously by passing it
through. The upper mold used in cold pressing was held by using a mold divided into a central
part corresponding to the cone part and an outer peripheral part corresponding to the edge part,
and the part corresponding to the sheet edge part was held. After that, since the portion
corresponding to the cone portion is pinched, no wrinkle occurs on the sheet. (3) When the air
venting hole is formed in the central portion of the upper mold, the formed sheet does not lift up
in response to the rise of the upper mold after pressing, and the sheet is not deformed. (4) In the
case of using a heater provided at the central portion and a water pipe at the outer peripheral
portion as the heating plate used in the heating step, the softening of the cone portion and the
edge portion different in thickness can be made uniform. (6) In the paper-making process, when
a circular sheet for cone is paper-formed and laminated on an edge-like sheet and at the same
time a guideline is paper-formed, meandering of the sheet can be detected based on this
guideline, and cutting of the sheet can be performed accurately.
4. Brief description of the drawings. FIG. 1 is a schematic view of a paper-making apparatus, FIG.
2 is a cross-sectional view of the circular mesh of the apparatus, and FIG. 3 (ha) to (g) are
speakers in one embodiment of the present invention. FIG. 4 is a cross-sectional view of a
speaker diaphragm manufactured by the manufacturing method of the present invention.
EndPage: 31 o ·········································································································································· Top Mold, 17
′ ·········· Center upper mold, 17 ······· Outer peripheral upper mold, 18 ······ Spring, 19 ············· Name
of Agent Attorney Nakao and 1 other EndPage: 4