JPS56128096

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DESCRIPTION JPS56128096
Description 1, title of the invention
Speaker diaphragm and method of manufacturing the same
3. Detailed Description of the Invention The present invention relates to a speaker diaphragm for
bonding surface materials to upper and lower edges of the core material, and a method of
manufacturing the same, using a tape-like member made of a lightweight and highly rigid
material such as aluminum foil. It is an object of the present invention to provide a speaker
vibration in which circumferential rigidity is improved, and a tape-like member and a surface
material are bonded at right angles, and a method of manufacturing the same. First, the
configuration of a speaker diaphragm of this type using a conventional tape-like member will be
described with reference to FIG. In FIG. 1, reference numeral 1 denotes a tape-like member made
of a lightweight and highly rigid material such as aluminum foil. This tape-like member 1 is
placed on the central axis of the surface material 2, 2 'between the surface materials 2, 2'. The
inner circumferential side and the outer circumferential side are alternately folded and radially
extended, and the upper edge and the lower edge of the tape-like member 1 are bonded at right
angles to the surface materials 2 and 2 '. EndPage: 1 However, in the above-mentioned
conventional speaker diaphragm, only by arranging the tape-like members 1 radially, there is a
drawback that the rigidity on the mechanical structure is relatively weak because reinforcement
is not continuous in the circumferential direction. there were. −! The strongest state as the
structure is the case where the tape-like member 1 is bonded at a right angle to the surface
material 2.2 ', but in the prior art example, the circumference is only slightly at the turning point
of the outer peripheral portion and the inner peripheral portion. Since the other parts are
arranged linearly in the radial direction only with connection in the direction, the holding force
for positioning the tape-like member 1 in the middle part at right angles to the surface materials
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2 and 2 'is the tape It is very unstable because it is only due to the tensile force of the bar-like
member 1, and in addition, it is generally difficult to position at right angles due to the twisting
of the tape itself. It was difficult to maintain the middle part at right angles to the facings 2, 2 '.
When the stroke from the outer periphery to the turning point of the inner periphery is small, it
is relatively easy to position the tape-like member 1 at right angles to the surface materials 2 and
2 ', but when the stroke is large, that is, large In the diaphragm for the aperture speaker, the
above-mentioned defect is an obstacle to the dog, and it was possible to exhibit the
characteristics of this type of speaker diaphragm characterized by light weight and high rigidity.
Therefore, the conventional diaphragm is limited to a speaker diaphragm with a relatively small
diameter such as that for tweeters. The present invention eliminates the above-mentioned
conventional drawbacks, and one embodiment of the present invention will be described below.
In FIG. 2, reference numeral 3 denotes a tape-like member made of a lightweight, high-rigidity
material such as aluminum foil, and the central axis of the surface materials 4, 4 'between the
surface materials 4, 4' The tape-shaped member 3 which is alternately folded back on the inner
peripheral side and the outer peripheral side which are in the center and which goes from the
outer peripheral part to the inner peripheral part and the tape-like member 3 which goes from
the inner peripheral part to the outer peripheral part The upper edge of this tape-like member 3
is connected to each other at six places in width, mutually connecting adjacent tape-like members
in the circumferential direction.
The lower edge is bonded to the surface material 4, 4 'at a right angle. FIG. 3 shows one
embodiment of the manufacturing method of the present invention. 6 denotes a substrate, and a
plurality of fixing pins 7 are annularly planted on a small diameter inner circumference circle
centered on one point of the substrate 6, and a plurality of fixing pins 7 are similarly provided on
the large circumference circle of the substrate 6. The fixing pin 8 is planted in a ring shape. The
relation between the fixing pin 7 and the fixing pin 8 is such that the fixing pin 8 is disposed on
the center line between the adjacent fixing pins 7. Further, between the fixed pin 7 and the fixed
pin 8, a plurality of pairs of movable pins 9, 10 ', 10'10', 11 '11', 12, 12 ', 13, respectively, on
circumferences having different diameters. 13 ', 14, 14' are arranged. ° C indicates the distance
between the movable pins 14.14 ', and the movable pin can move in the direction in which the
distance a decreases. The positional relationship of the fixing pins arranged on the adjacent
circumferences is a relation in which a pair of fixing pins on the other circumference is located
on the center line between two pairs of fixing pins adjacent on one circumference. It is. The
heights of the fixed pin and the movable pin are smaller than the width of the tape-like member
30. As also shown in FIG. 3, the tape-like member 3 is sequentially moved from the fixed pin 8 to
the space 2 between the movable pins 14.14 ', the space between the movable pins 13.13', the
movable pin 12'12 '. Between the movable pins 11.11 ', between the movable pins 10, 10',
between the movable pins 9, 9 ', folded back at the fixed pin 7, and again movable pin 9 , 9 '->
10, 10'-> 11, 11 '-> 12.12'-13, 13'-14, 14', and when the above one stroke is completed, each
movable pin 9, 9 is completed. ', 10.10', 11.11 ', 12.12', 13.13 ', 14, 14' are approached. Since
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the adhesive is previously applied to the surface of the tape-like member 30 and the movable pin
is heated, the movable pins 9 ', 10, 10', 11.11 ', 12, 12', The tape-like members held between 13
° 13 ', 14 and 14' are bonded. This operation is repeated, and the tape-like member 3 is
stretched over the entire surface of the substrate 6. Next, the surface material 4 having a
thermosetting adhesive applied on one side is disposed on the upper edge of the stretched tapelike member 3, and is pressed and heated to the upper edge of the tape-like member 3. Bond the
surface material 4. Next, the surface material 4 to which the tape-like member 3 is adhered is
removed, and similarly, the surface material 4 'is adhered to the lower edge of the tape-like
member 3 to complete it, which is EndPage: 2.
In FIG. 3, the shape of the movable pin is shown as a circle, but if this movable pin is square and
surface contact is made, the tape-like members are surface-bonded as shown in FIG. It is In the
embodiment shown in FIG. 3, a plurality of pairs of movable pins are arranged on the same
circumference, but a pair of movable pins is arranged on each circumference and in the direction
perpendicular to the substrate 6 It is possible to make it movable, and intermittently rotate the
movable pin or the substrate 6 (in this way, it is also possible to sequentially bond the tape-like
members in each stroke with the same movable pin. The present invention is configured as
described above, and according to the present invention, the following effects can be obtained.
(1) Adjacent tape-like members arranged radially are adhered to each other so that they can
extend in the circumferential direction, thereby increasing the rigidity. (2) Since the tape-like
members extend in the circumferential direction and the tape-like members are bonded at right
angles to the surface material, the rigidity increases. (3) Since the tape-like member is adhered at
a right angle to the surface material, the chest separation strength between the surface material
and the tape-like member is increased. (4) A speaker diaphragm with a large diameter can also be
manufactured. (5) As compared with the conventional manufacturing method of expanding the
unstretched · · · · · · · · · · · · ブ ロ ッ ク material block, as well as the number of processes is
reduced, automation becomes possible.
4. Brief description of the drawings. FIG. 1 is a partially cutaway perspective view of a
conventional speaker diaphragm, FIG. 2 is a partially cutaway perspective view of a speaker
diaphragm in one embodiment of the present invention, and FIG. It is a top view of the
manufacturing apparatus of the speaker diaphragm of this invention. 3 · · · · · · · Tape-like
member, 4, 4 · · · · · · · Surface material, 6 · · · · · · · · · · · · · · · · · · · fixed pin, 9, 9 ', 10, 10 ′, 11.11
′, 12, 12 ′, 13 ° 13 ′, 14, 14 ′... Name of agent Attorney Nakao et al. 1 person Fig. 1 2 "Fig.
2 Fig. 3 EndPage: 3
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