JPS5911236B2 - Speaker diaphragm and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker diaphragm, which is a tape-shaped member made of a lightweight and highly rigid material such as aluminum foil, and a method for manufacturing the same, in which a surface material is bonded to each of the upper and lower edges of the core material. The present invention provides a vibrator for a speaker that has improved circumferential rigidity and in which a tape-like member and a surface material are bonded at right angles, and a method for manufacturing the same.

First, the structure of this type of speaker diaphragm using a conventional tape-shaped member will be explained with reference to FIG.

In FIG. 1, 1 is a tape-shaped member made of a lightweight and highly rigid material such as aluminum foil, and this tape-shaped member 1 is connected to surface materials 2 and 2.
In this system, the inner circumference side and the outer circumference side of the surface material 2, 2' are alternately folded back and stretched radially around the central axis, and the upper and lower edges of this tape-like member 1 are wrapped around the surface material 2, 2'. ′ is glued at right angles to .

However, in the conventional speaker diaphragm described above, the tape-like members 1 are only arranged radially, and there is no reinforcing connection in the circumferential direction, so the mechanical structure has a relatively weak rigidity. .

In addition, the strongest state as a structure is when the tape-like member 1 is glued at right angles to the surface materials 2, 2', but in the conventional example, the circumference is slightly glued only at the folding points of the outer and inner peripheries. There is only continuity in the direction, and the other parts are arranged linearly in the radial direction, so the tape-shaped member 1 in the middle part
Since the holding force that holds the tape perpendicular to the surface materials 2 and 2' is due only to the tensile force of the tape-like member 1, it is in a very unstable state.In addition, due to twisting of the tape itself, In general, it is difficult to maintain the tape-like member 1 at a right angle, and in particular, it is difficult to maintain the middle portion of the tape-like member 1 at a right angle to the surface materials 2, 2'.

If the stroke from the outer periphery to the turning point on the inner periphery is small, it is relatively easy to position the tape-like member 1 at right angles to the surface materials 2, 2', but if the stroke is large, i.e. The above-mentioned drawbacks have been a major hindrance in the diameter speaker diaphragm, and the characteristics of this type of speaker diaphragm, which is characterized by light weight and high rigidity, cannot be exhibited.

Therefore, the conventional diaphragm has been limited to a diaphragm for a relatively small diameter groove such as a tweeter.

The present invention eliminates the drawbacks of the prior art, and one embodiment of the present invention will be described below.

In Fig. 2, numeral 3 is a tape-like member made of a lightweight and highly rigid material such as aluminum foil. The tape-shaped member 3 is folded back alternately on the inner circumferential side and the outer circumferential side of the center, and the tape-shaped member 3 going from the outer circumferential part to the inner circumferential part and the tape-like member 3 going from the inner circumferential part to the outer circumferential part are folded at an arbitrary location 5. The tape-like members 3 are pasted together at six points in width, adjacent tape-like members in the circumferential direction are interconnected, and the upper and lower edges of the tape-like member 3 are adhered at right angles to the surface materials 4, 4'.

FIG. 3 shows an embodiment of the manufacturing method of the present invention.

Reference numeral 6 denotes a substrate, and a plurality of fixing pins 7 are installed in an annular manner on a small diameter inner circumferential circle centered on one point of the substrate 6, and a plurality of fixing pins 7 are similarly implanted on a large diameter outer circumferential circle of the substrate 6. A fixing pin 8 is installed in an annular shape.

The relationship between the fixing pin T and the fixing bin 8 is that the adjacent fixing pin 1
The fixing pin 8 is arranged on the center line between the two.

Further, between the fixed pin 7 and the fixed pin 8, there are a plurality of pairs of movable pins 9, 9-10, 1 on the circumference with different diameters.
0', 11, 11', 1 2, 1 2', 13tl
3', 14, and 14' are arranged.

l is the movable pin 1 4 . 14', and the movable pin can move in the direction in which this distance l becomes smaller.

The positional relationship of fixed pins placed on adjacent circumferences is as follows:
The relationship is such that a pair of fixing hinges on one circumference are located on the center line between two pairs of adjacent fixing pins on one circumference.

Note that the heights of the fixed pin and the movable pin are smaller than the width of the tape-like member 3.

As shown in FIG. 3, the tape-shaped member 3 is sequentially moved from the fixed pin 8 to the movable pin 1 4 . 1 4' gap l,
Movable pin 1 3. Opening space between 1 and 3', movable pin 12
, 12', a gap between movable pins ii, i'i',
Movable hinge 1 0. 1 0' gap, movable pin 9,
Hang it between the openings between 9', fold it back with the fixed pin 7, and attach the movable pins 9.9'-10.10' → 11, 11' + 12, 1 again.
Multiply between 2'→13, 13'-14.14' and 1 above
When the stroke is completed, each movable pin 9, 9',
1 0 , 1 0', 11, 11', 1 2 , 1
2', 13, 13', 1 4. 1 4' approaches.

Since the surface of the tape-like member 3 is coated with adhesive in advance and the movable pins are heated, the movable pins 9, 9', 10, 10', 11, 11', 12,
12', 1 3, 1 3', 1 4, 1 4'
The tape-shaped members sandwiched therebetween are bonded together.

This operation is repeated, and the tape-like member 3 is applied to the entire surface of the board 6.
is strung up.

Next, the surface material 4 coated with thermosetting adhesive on one side,
It is placed on the upper edge of the stretched tape-like member 3 and pressurized.
The surface material 4 is adhered to the upper edge of the tape-like member 3 by heating.

Next, the surface material 4 to which the tape-shaped member 3 has been adhered is removed, and in the same manner, a surface material 4' is adhered to the lower edge of the tape-shaped member 3 to complete the process.

Note that although the shape of the movable pin is shown as circular in FIG. 3, if the movable pin is made square and is brought into surface contact, the tape-like members will be surface-adhered as shown in FIG. It is something that

In the embodiment shown in FIG. 3, a plurality of pairs of movable pins are arranged on the same circumference, but one pair of movable pins is arranged on each circumference, and one pair of movable pins is arranged on each circumference, and one pair of movable pins is arranged on each circumference, and By making the movable pin movable and rotating the movable pin or the substrate 6 intermittently, it is also possible to sequentially bond tape-like members in each stroke using the same movable pin.

The present invention has the above configuration, and according to the present invention, the following effects can be obtained.

(1) Adjacent tape-like members disposed radially are bonded together and connected in the circumferential direction, resulting in increased rigidity.

(2) The tape-like members are continuous in the circumferential direction, and the tape-like members are adhered at right angles to the surface material, so the rigidity is increased.

(3) Since the tape-like member is adhered to the surface material at right angles, the peel strength between the surface material and the tape-like member is increased.

(4) Large diameter speaker diaphragms can also be manufactured.

(5) Compared to the conventional manufacturing method of rolling out unstretched honeycomb blocks, the number of steps is reduced and automation is possible.

[Brief Description of the Drawings] Fig. 1 is a partially cutaway perspective view of a conventional speaker diaphragm, and Fig. 2 is a partially cutaway perspective view of a speaker diaphragm according to an embodiment of the present invention. FIG. 3 is a top view of the apparatus for manufacturing a speaker diaphragm according to the present invention. 3゜゜゛′゛Tape-shaped member, 4. 4'--Surface material, 6--Substrate, 7, 8--Fixing pin, 9, 9', 10, 10', 11, 11', 12, 1
2', 1 3, 1 3', 1 4, 1 4'-
...Movable pin.

Claims (1)

[Scope of Claims] 1. A speaking force diaphragm in which a tape-shaped member such as aluminum foil is used as a core material and a surface material is bonded to the upper and lower edges of the core material, the center side and the outer periphery of the surface material A speaker diaphragm formed by adhering adjacent tape-like members at one or more places of tape-like members alternately folded back and radially shaped. 2. Tape-like members such as aluminum foil, the surface of which has been coated with adhesive in advance, are hung alternately on fixing pins fixed on a small-diameter inner circumference circle and a large-diameter outer circumference centering on one point on the board. At the same time, inserting an adjacent tape-like member between at least a pair of movable pins arranged between the fixed pin on the inner circumferential circle and the fixed pin on the outer circumferential circle, and bringing the movable pins closer together. After adhering the adjacent tape-like members and adhering a surface material to the upper edge of the tape-like member, the tape-like member is pulled out from the fixing pin, and another surface material is attached to the lower edge of the tape-like member. A method of manufacturing a speaker diaphragm characterized by adhesive bonding.