JP6744067B2 - Speaker and manufacturing method thereof - Google Patents

Description

The present invention relates to a speaker, which is a type of acoustic device, and a method for manufacturing the speaker, and more specifically, a top plate of a magnetic circuit can be easily joined to the bottom rear surface of the speaker frame, and the outer diameter of the joined portion of the speaker frame is smaller than the outer diameter of the top plate. And a method of easily coupling a top plate of a magnetic circuit to a frame of a speaker in a speaker manufacturing process.

As is well known, the speaker includes a frame, a diaphragm provided on the front surface of the frame, a magnetic circuit provided on the back side of the frame, and the like.

As the magnetic circuit, there are inner magnet type and outer magnet type magnetic circuits. The magnetic circuit is composed of components such as a top plate, a bottom yoke, and a magnet arranged between them. A top plate of a magnetic circuit is connected to the frame.

There are several methods for connecting the frame and the top plate, which is a component of the magnetic circuit. As one of them, there is a method of projecting a dowel from the top plate and using the projecting dowel to connect the dowel of the top plate to a frame made of an iron plate or a resin by spin, split caulking or the like (Patent Document 1). FIG. 2, Patent Document 2).

Also, although it is limited to a resin frame, at the time of insert molding, a method of assembling the magnetic circuit plate into the frame at the same time (Patent Document 3), or providing a protruding shape such as a hook on the outer periphery of the plate to draw the frame hook There is also a method of rotating and connecting the plates.

Further, a method has also been proposed in which a claw for caulking is provided on the outer side (corner portion) of the outer periphery of the thin top plate and the resin frame is caulked (Patent Document 4).

JP-A-60-54597 Japanese Examined Japanese Patent Sho 56-49520 Japanese Patent Publication 61-38679 Patent No. 5494901

In the method of sticking out the dowel on the top plate and connecting the top plate to the frame through the dowel, the shape of the connecting portion of the frame could be connected with a size smaller than the top plate, but in the case of other conventional technology, The frame connecting part is larger than the plate. Therefore, when the frame is made of resin, the amount of material is larger than that of the connecting method using the dowels formed on the top plate, and the material cost is correspondingly high and the cost is high. Also, the larger the frame, the larger the damper.

Recently, weight reduction such as reducing the thickness of the plate is progressing. Thinning the top plate makes it impossible to provide a dowel for caulking, and these solutions are desired.

As shown in FIG. 13, caulking claws 11 project from the outer periphery of the top plate 10, and as shown in FIG. 14, the claws 11 are inserted into the mounting holes 21 of the frame 20 and the claws 11 are caulked. In the method of connecting the plate 10 to the frame 20 (Patent Document 4), even if the top plate 10 can be made thin, the claw 11 is provided at the outer position of the outer periphery thereof, so It is not possible to make the connecting part on the bottom of the frame smaller.

That is, when the claws 11 for crimping are provided on the outer periphery of the top plate 10, the outer diameter of the bottom portion of the frame 20 connected to the top plate 10 is always larger on the frame side.

Specifically, when the outer circumference of the top plate is, for example, 80 mm, the size of each corner is 113.1 mm, and this length is used to provide a claw for caulking on the outer circumference.

Therefore, on the side of the frame that receives the crimping nail, depending on the wall thickness of the frame, for example, in the case of 3 mm, each nail dimension 113.1-(5.5+5.5)=102.1 mm, the nail is inserted. When the hole has a thickness of 2 mm for the top plate, a hole of 2.2 mm×3 mm is required, and therefore 102.1 mm+4.4 mm=106.5 mm.

From the above, the minimum diameter required for the bottom of the frame is 106.5 mm + the thickness of the bottom of the frame is 3 mm x 2 = 112.5 mm, the bottom of the frame is large, and a resin frame requires a large amount of resin, resulting in high cost. Further, if the frame diameter is large, the outer diameter of the damper fixed to the frame is also increased accordingly, so that there is a problem that the amount of material is increased and the cost is increased as a whole.

The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a speaker in which the outer diameter of the connecting portion between the top plate and the frame can be made smaller than that of the top plate, and a manufacturing method thereof. ..

The invention according to claim 1 is a speaker in which a top plate 1 of a magnetic circuit is connected to a frame 3 provided with a diaphragm on the front surface and a back surface of the frame bottom portion 3b ,
And the outer peripheral portion of the top plate 1, a substantially middle position between the outer peripheral portion of the central opening 1A, projected at intervals along the pin 2 for a plurality of caulking in the circumferential direction, the root of the pin 2 on one side of the formed hole 2a of the jig insertion for rotation prevention and the pin insertion hole 4 in the frame bottom 3 b of the pin 2 is inserted, the pin insertion hole 4 A tapered surface 4b is formed on one side 4a of the pin 2 that is inserted into the pin insertion hole 4, and the top of the collapsed pin 2 is caulked to the top of the top of the frame bottom 3b. The plate 1 is connected.
A loudspeaker according to a second aspect is the loudspeaker according to the first aspect, wherein a top plate rotation preventing collar 1b is formed when the pin 2 is crimped in a radial direction of an outer peripheral portion of the top plate 1.
The invention according to claim 3, the back of the frame bottom 3b, in the manufacturing method of the speaker top plate 1 of the magnetic circuit are connected, the outer peripheral portion of the top plate 1 having an opening 1A in the central opening A plurality of caulking pins 2 are cut and raised along the circumferential direction at an approximately intermediate position with respect to the outer peripheral portion of 1A. There is a hole 2a at the base of the pin 2 and the pin 2 at the frame bottom 3b. Corresponding to, a pin insertion hole 4 into which the pin 2 is inserted is formed, and a tapered surface 4b is formed on one side 4a of the pin insertion hole 4, and the pin 2 is inserted into the pin insertion hole 4 and The pin 2 is pushed down to the tapered surface 4b side, a jig is inserted into the hole 2a at the base of the pin 2 , or the rotation preventing collar 1b formed in the radial direction of the outer periphery of the top plate 1 is fixed by the jig. The speaker is manufactured by fixing and connecting the top plate 1 to the back surface of the frame bottom portion 3b by crimping the upper portion of the pin 2 in the rotation direction while preventing the top plate 1 from rotating.

According to the present invention of claims 1 to 3, the pin 2 for caulking is provided at the inner position of the top plate 1, that is, the outer periphery of the top plate 1 and the outer periphery of the opening 1A formed in the center of the top plate 1. Since it is provided at approximately the intermediate position, the bottom surface of the frame connected to it can be designed small, and when the frame 3 is made of resin, the material can be reduced and the outer diameter of the damper connected to the frame 3 can be reduced accordingly. Can be made smaller, and the cost can be reduced as a whole.
B) The radial space of the part where the top plate 1 is attached to the frame 3 needs only the width of the claws, and it is suitable when there is no change before and after caulking and there is no space in the radial direction. It is easy to design a speaker.
C. When crimping the upper part of the pin 2, the hole 2a left when the pin is cut and raised or the collar 1b protruding from the outer periphery of the top plate 1 is fixed with a jig to prevent the top plate 1 from rotating and to ensure You can crimp the top of the pin.
The speaker manufactured by using the top plate according to the present invention can be designed so that the shape connected to the damper seat due to the structure in which the flat portion on the bottom surface of the frame is received is orthogonal to the magnetic circuit, so that the vibration at the vibration of the diaphragm is suppressed. Can be reduced.

The schematic perspective view of the top plate which concerns on the principal part of 1st Example of this invention. FIG. 3 is a schematic perspective view of a part of the frame according to the main part of the first embodiment of the present invention. Explanatory drawing of the taper surface formed in the pin insertion hole part of the frame of this invention. The perspective view which shows the state which inserted the pin of the top plate into the pin insertion hole of the frame of this invention. Explanatory drawing of the state which pushed down the pin inserted in the pin insertion hole of the same frame. The perspective view of the top plate concerning a 2nd example of the present invention. The perspective view of the frame in the 2nd Example. The perspective view of the state which inserted the pin of the top plate into the pin insertion hole of the same frame. Explanatory drawing which looked at the same frame from the side. The perspective view which showed the whole frame and which looked at the state which attached the top plate to the frame bottom rear surface from the upper part. The perspective view which looked at the same frame from the bottom back side. The perspective view which looked at the speaker from the side in which the magnetic circuit containing the top plate was built in the frame bottom. The perspective view of the top plate of a prior art example is shown. The perspective view of the frame of a prior art example is shown.

FIG. 1 is a schematic perspective view of a top plate of a magnetic circuit used in the first embodiment of the present invention.

The top plate 1 having an opening 1A in the center has a ring shape, and in the state shown in the drawing, a plurality of caulking pins 2 preferably having a rectangular cross section are formed on the front surface (upper surface) 1a along the circumferential direction. Have been cut and raised at intervals. The cut-and-raised directions of these pins 2 are the same, and a hole 2a caused by the cut-and-raised pins is formed at the base of the cut-and-raised pins 2. Although the number of pins 2 is four in the figure, the number of pins 2 can be appropriately increased or decreased according to the size of the speaker. Further, the shape of the top plate 1 is shown as a circular shape, but the shape is not necessarily circular.

The present invention is characterized in that the positions of these pins 2 are not provided at the outer peripheral position of the top plate 1 as in the conventional example shown in FIG. In the state of FIG. 1, it is slightly on the outer peripheral side of the top plate 1 from the intermediate position a between the outer periphery of the top plate 1 and the outer periphery of the opening 1A, but it may be set at a substantially intermediate position.

FIG. 2 is a perspective view of the frame 3 to which the top plate 1 is connected. In FIG. 2, the shape of the frame 3 is drawn only up to the damper adhesion portion for convenience of description. Actually, as shown in FIGS. 10 to 12 which will be described later, there are cone paper edge partial adhesion shelves and flanges. The frame 3 having the opening 3a formed in the center has a frame bottom 3b to which the front side of the top plate 1 is connected on the back side, and a peripheral wall 3c which is inclined and protrudes forward in the outer peripheral part of the frame bottom 3b. The front end of the peripheral wall 3c is provided with a flange portion 3d that extends toward the front by expanding its diameter, and a damper bonding portion 3e formed on the outer periphery of the flange portion.

A pin insertion hole 4 for inserting the pin 2 is formed in the bottom portion 3b of the frame 3 corresponding to the shape and number of the pins. In this example, the pin insertion hole 4 is formed in a rectangular shape corresponding to the pin shape. Further, as shown in FIG. 3, on one side 4a of the pin insertion hole 4, that is, on the side where the pin 2 is collapsed, a tapered surface inclined from the rear surface 3b' of the frame bottom portion 3b to the frame bottom front surface side 3b''. 4b is formed. After the pin 2 is inserted into the pin insertion hole 4, the pin 2 is tilted toward the tapered surface 4b. The inclination angle α of the tapered surface 4b is set to 45 degrees or less.

The tapered surface 4b is formed because when the pin 2 is tilted down, the pin 2 is received and supported by the tapered surface 4b. The tapered surface 4b allows the plurality of pins 2 to be uniformly collapsed with the same bending without variation.

It is needless to say that the shape of the pin 2 and the pin insertion hole 4 into which the pin 2 is inserted in the above is a shape that allows the pin 2 to be inserted and to be tilted down toward the tapered surface 4b.

FIG. 4 is a perspective view showing a state in which the top plate 1 is incorporated from the bottom rear surface side of the frame 3 as viewed from the frame front surface side. When assembling, the pin 2 protruding from the top plate 1 may be inserted into the pin insertion hole 4 of the frame 3 from the rear side of the frame bottom. FIG. 4 shows a state before the inserted pin 2 is collapsed toward the tapered surface 4b.

FIG. 5 shows a state in which the pin 2 is pushed down. That is, each of the pins 2 inserted into the pin insertion hole 4 and protruding forward is pushed down from above by a jig (not shown) to be brought down to abut on the tapered surface 4b.

FIG. 6 shows a schematic perspective view of a top plate according to a second embodiment of the present invention.

Since the caulking work uses a jig (not shown) that rotates like the high spin method, it is necessary to prevent the top plate 1 from rotating at that time. In the above-described embodiment, the pin 2 is cut and raised, and the remaining hole 2a is used to prevent rotation during crimping. However, in this embodiment, the outer peripheral portion of the top plate 1 is protruded in the radial direction, when performing rotary crimping. It is characterized in that the collar 1b for preventing the rotation is provided in a protruding manner. The rotation-preventing collar 1b is provided outside the pin insertion hole 4, but is not limited to this position, and the number may be increased or decreased as appropriate.

In addition, a ring-shaped protrusion 1C protruding forward is formed on the outer peripheral portion of the opening 1A formed in the center of the top plate 1. This protrusion 1C is used for securing Tg and as a frame guide.

FIG. 7 shows a frame 3 to which the top plate 1 is connected. This frame 3 is similar to that of the first embodiment. FIG. 8 shows a state in which the top plate 1 is incorporated from the back side of the frame 3. FIG. 9 is a side view of the same.

FIG. 10 shows a perspective view of the entire frame in which a top plate is incorporated in the bottom rear surface of the frame. 3f is a window, 3g is a mounting part, and 3h is a terminal part. FIG. 11 is a perspective view seen from the bottom side. The pin 2 is collapsed toward the tapered surface 4b side, as shown in FIG.

In the first and second embodiments, in order to connect the top plate 1 to the bottom surface of the frame bottom, first, an adhesive is applied to the front surface of the top plate.

Next, the pin (2) of the top plate (1) is inserted into the pin insertion hole (4) of the frame bottom (3), and the front surface of the top plate (1) coated with the adhesive is brought into contact with the frame bottom rear surface. Let

Next, the protruding pin (2) may be tilted in the direction opposite to the clockwise direction toward the tapered surface (4b) by 45 degrees or more, and the pin (2) may be pressed from above and caulked.

The reason for crimping in the rotating direction is that the fitting strength is increased by making the vertical portion of the frame orthogonal to the top plate (1).

In FIG. 12, a magnetic circuit (1A) is configured by incorporating a bottom yoke (1d) and the like into the top plate (1), the magnetic circuit (1A) is attached to the bottom rear surface of the frame, and the front surface of the frame 3 is provided. A state in which the diaphragm 3A and the like are incorporated to complete the speaker S is shown. A known method may be used as a procedure for incorporating the diaphragm 3A and the like.

Although the pins 2 are crimped in the same direction in each of the above-described embodiments, the pins 2 may be crimped in two positions instead of all in the same direction. In this case, the tapered surface 4b may be formed on the side where the pin 2 is collapsed.

1 Top Plate 1A Opening 1a Front 1b Rotation Prevention Collar 1c Projection 2 Caulking Pin 2a Hole a Intermediate Position 3 Frame 3a Opening 3b Frame Bottom 3c Circumferential Wall 3d Flange 3e Projection 4 Pin Insertion Hole 4a One Side 4b Tapered surface

Claims (3)

In a speaker in which a frame (3) provided with a vibration plate on the front surface and a top plate (1) of a magnetic circuit are connected to the back surface of the frame bottom portion ( 3b) ,
And the outer peripheral portion of the top plate (1), a substantially middle position between the outer peripheral portion of the central opening (1A), projecting at intervals along the pin for a plurality of caulking (2) in the circumferential direction A jig insertion hole (2a) for preventing rotation is formed on one side of the root of the pin (2) , and the pin (2) is inserted into the frame bottom ( 3b ). Is formed with a pin insertion hole (4), and one side (4a) of the pin insertion hole (4) is a tapered surface (4b ) into which the pin (2) inserted into the pin insertion hole (4 ) is collapsed. ) Is formed, and the top of the pin (2) that has been collapsed is caulked in the rotational direction, and the top plate (1) is connected to the back surface of the frame bottom (3b) . The speaker according to claim 1, wherein a top plate rotation preventing collar ( 1b) is formed when the pin (2) is crimped in a radial direction of an outer peripheral portion of the top plate (1). The back of the frame bottom (3b), in the manufacturing method of the speaker top plate of the magnetic circuit (1) is connected, the opening in the central portion outer peripheral portion and the opening portion of the top plate having the (1A) (1) A plurality of caulking pins (2) are cut and raised along the circumferential direction at an approximately intermediate position with the outer peripheral portion of (1A) , and there are holes (2a) at the base of this pin (2) , frame bottom (3b) corresponds to the pin (2) is pin insertion hole which the pin (2) is inserted (4) is formed, taper on one side (4a) of the pin insertion hole (4) A surface ( 4b) is formed, the pin (2) is inserted into the pin insertion hole (4) , and the pin (2) is tilted toward the tapered surface ( 4b) side to form a hole (2a) at the base of the pin. ) to insert a jig, or the top plate (1) outer peripheral portion radially to form the anti-rotation collar of the (1b) and fixed by a jig, the while preventing the rotation of the top plate (1) A method for manufacturing a speaker, comprising caulking an upper part of a pin (2) in a rotational direction to connect the top plate (1) to a back surface of a bottom part ( 3b) of the frame (3) .

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