JP2009100289A - Bonding structure of dust cap of speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance beauty by preventing an adhesive from being exposed while increasing adhesive strength with simple constitution. <P>SOLUTION: The bonding structure of the dust cap of this speaker includes a diaphragm, the dust cap covering a surface of the diaphragm, and an edge fixing a peripheral end of the diaphragm and a peripheral end of the dust cap. An adhesion portion for bonding and fixing the peripheral end of the dust cap is provided at an inner end of the edge. Further, a recess into which an adhesive is injected is formed on the surface of the adhesion portion which is opposed to the peripheral end of the dust cap. Then a first rib to enter the recess is formed at the peripheral edge of the dust cap. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a speaker, and more particularly to a dust cap joining structure in a speaker.

  In recent years, there has been known a speaker 100 in which the entire surface of a diaphragm 101 is covered with a dust cap 102 as shown in FIG. Since the present application relates to joining at the diaphragm 101, the dust cap 102, and the edge 104, other components such as a magnetic circuit and a damper that are generally included in a speaker as shown in FIG. Is omitted. FIG. 4 is an enlarged view showing an engaged state of the vibration plate 101, the dust cap 102 and the edge 104. As shown in FIG. 4, the edge 104 is formed in a substantially semicircular arc shape that is convex toward the front surface, and an outer end portion 105 thereof is fixed to the frame 103. The inner end 106 of the edge 104 is formed in a flat plate shape, and the peripheral end 107 of the diaphragm 101 is fixed to the back surface of the inner end 106. The peripheral end portion 108 of the dust cap 102 is bonded and fixed by an adhesive 109 applied to the inner end portion 106 of the edge 104 and the surface of the peripheral end portion 107 of the vibration plate 101. As a result, the entire surface of the diaphragm 101 is covered with the dust cap 102.

In addition to this, in order to increase the adhesive strength, for example, a method is also known in which a plurality of half-moon shaped recesses are formed in the middle of the slope of the diaphragm, and a dust cap is fixed after applying an adhesive in each recess (For example, refer to Patent Document 1).
JP 2006-157840 A

By the way, in the case of the fixing method disclosed in Patent Document 1, since it is necessary to apply an adhesive to a plurality of recesses at the time of manufacturing, the number of steps increases, leading to an increase in manufacturing cost. For this reason, even if it is a simple structure, raising the adhesive strength of a dust cap and a diaphragm is desired.
Further, as shown in FIG. 4, the peripheral end portion 108 of the dust cap 102 is bonded and fixed by the adhesive 109 applied to the inner end portion 106 of the edge 104 and the peripheral end portion 107 of the vibration plate 101. If it is, the adhesive 109 may protrude from the end portion and the appearance may be impaired.
Therefore, an object of the present invention is to increase the aesthetics by preventing the adhesive from being exposed while increasing the adhesive strength with a simple configuration.

The invention described in claim 1
A diaphragm,
A dust cap covering the surface of the diaphragm;
In a dust cap joining structure in a speaker having a peripheral end portion of the diaphragm and an edge for fixing the peripheral end portion of the dust cap,
The inner end portion of the edge is provided with an adhesive portion for bonding and fixing the peripheral end portion of the dust cap,
On the surface facing the peripheral end portion of the dust cap in the adhesive portion, a recess into which an adhesive is injected is formed,
A first rib that enters the concave portion is formed at a peripheral end portion of the dust cap.

The invention according to claim 2 is the dust cap joining structure according to claim 1,
At the peripheral end of the diaphragm, a fitting portion is formed to which the edge adhesive portion is fitted,
A second rib is formed on the inner side of the first rib in the dust cap so as to overlap the side surface of the fitting portion.

According to the present invention, the adhesive is injected into the concave portion of the adhesive portion at the edge, and the dust cap and the edge are bonded and fixed by the first rib of the dust cap entering the concave portion. Become. At this time, since the adhesive is in the concave portion, it can be prevented from being exposed from the end portion of the dust cap even after bonding, and the aesthetic appearance is enhanced.
Compared to the conventional method in which a plurality of half-moon-shaped recesses are formed in the middle of the slope of the diaphragm and an adhesive is applied in each recess, the first rib has an edge while having a simple configuration. It is possible to increase the strength after bonding.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of a dust cap joining structure in the speaker of the present embodiment, and FIG. 2 is an enlarged view showing the inside of a one-dot chain line portion of FIG. 1 is a simplified cross-sectional view illustrating only the components according to the main part of the present invention for the convenience of explaining the main part of the present invention. Although general components in the speaker as shown in FIG. 3 are provided, they are not the main part of the invention, and thus illustration and description thereof are omitted. As shown in FIGS. 1 and 2, the speaker 1 is fixed with a diaphragm 2, a dust cap 3 that covers the surface of the diaphragm 2, a peripheral end 21 of the diaphragm 2, and a peripheral end 31 of the dust cap 3. An edge 4 that supports the edge 4 and a frame 5 that supports the edge 4.

  The diaphragm 2 is formed in a substantially conical shape so as to be recessed downward in the figure, and a magnetic circuit (not shown) is attached to the center thereof. The peripheral end 21 of the diaphragm 2 includes a diaphragm base 22 extending horizontally, a first diaphragm rib 23 erected vertically from the tip of the diaphragm base 22 toward the front side, A second diaphragm rib 24 erected vertically from the base end of the diaphragm base 22 toward the front side is formed over the entire circumference. A groove 25 is formed on the surface of the peripheral end 21 of the diaphragm 2 by the diaphragm base 22, the first diaphragm rib 23, and the second diaphragm rib 24. The diaphragm base 22, the first diaphragm rib 23, the second diaphragm rib 24, and the groove 25 are the fitting portions according to the present invention.

  The dust cap 3 is formed in a substantially arc shape in cross section so as to be recessed downward in the drawing within a range where the dust cap 3 is not touched. The peripheral end 31 of the dust cap 3 has a cap base 32 extending horizontally and a first cap rib (first rib) 33 erected vertically from the tip of the cap base 32 toward the back side. And the 2nd cap rib (2nd rib) 34 erected perpendicularly | vertically toward the back side from the base end part of the base part 32 for caps is formed over the perimeter. Here, the first cap rib 33 is located between the first diaphragm rib 23 and the second diaphragm rib 24, and the second cap rib 34 is the inner part of the second diaphragm rib 24. It is located so as to overlap the side surface 24a.

The edge 4 is formed in an annular shape so as to surround the diaphragm 2 and the dust cap 3. The outer end 41 of the edge 4 is fixed to the frame 5. The edge 4 has an arcuate portion 42 that is convex toward the front side, and an adhesive portion 43 that is formed at the inner end of the arcuate portion 42 and is bonded and fixed to the peripheral end of the dust cap 3. It is provided over.
When the bonding portion 43 is fitted in the groove 25 of the diaphragm 2, the surface 43a of the bonding portion 43 and the tip surface 24b of the second diaphragm rib 24 are flush with each other. It is formed in a rectangular shape. A concave portion 44 into which an adhesive is injected is formed at a position where the adhesive portion 43 is engaged with the first cap rib 33 on the surface (surface) facing the peripheral end portion of the dust cap 3 in the adhesive portion 43. The recess 44 is formed larger than the first cap rib 33.

Next, the operation of this embodiment will be described.
In assembling the speaker 1, when the diaphragm 2 is fixed to the edge 4, first, an adhesive is injected into the groove 25 of the diaphragm 2, and the adhesive portion 43 of the edge 4 is inserted into the groove 25. Mated. At this time, the adhesive protrudes from the points A and B in FIG.

  When the edge 4 and the diaphragm 2 are fixed, an adhesive is injected into the recess 44 and the adhesive is applied to the inner surface 24 a of the second diaphragm rib 24 or the outer surface 34 a of the second cap rib 34. Is applied. Thereafter, the diaphragm 2 is covered with the dust cap 3 so that the first cap rib 33 enters the recess 44 of the edge 4. Here, since the recessed part 44 is formed larger than the rib 33 for 1st caps, it will prevent that the adhesive agent in the recessed part 44 protrudes outside. Further, the adhesive protruding from the points A and B is also hidden by the edge 4 and the dust cap 3, and there is no influence on the appearance.

As described above, according to the joint structure of the dust cap 3 in the speaker 1 of the present embodiment, the adhesive is injected into the concave portion 44 of the bonding portion 43 at the edge 4, and the dust cap 3 is inserted into the concave portion 44. As the first cap rib 33 enters, the dust cap 3 and the edge 4 are bonded and fixed. At this time, since the adhesive is in the recess 44, the adhesive can be prevented from protruding from the end of the dust cap 3 even after bonding, and the aesthetic appearance is enhanced.
And even if it is a simple structure compared with the system which forms several half-moon shaped recessed parts in the middle of the slope of the diaphragm 2 like before, and apply | coats an adhesive agent in each recessed part, for 1st caps Since the rib 33 engages with the concave portion 44 of the edge 4, the strength after bonding can be increased.

And since the 2nd cap rib 34 has overlapped with the 2nd diaphragm rib 24, both contact surfaces can be made into an adhesive surface. That is, a sufficient bonding area can be secured without the need for adhesion for reinforcement in the middle of the slope of the diaphragm as in the prior art, and no reinforcement is required. And since sufficient adhesive area is ensured, adhesive strength is also stabilized.
Of course, the present invention is not limited to the above-described embodiment and can be modified as appropriate.

It is sectional drawing which shows schematic structure of the joining structure of the dust cap in the speaker which concerns on this embodiment. It is an enlarged view which shows the inside of the dashed-dotted line part of FIG. It is sectional drawing which shows schematic structure of the conventional speaker. It is an enlarged view which shows the engagement state of the diaphragm with which the speaker of FIG. 3 is equipped, a dust cap, and an edge.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker 2 Diaphragm 3 Dust cap 4 Edge 5 Frame 21 Peripheral edge 22 Diaphragm base (fitting part)
23 Rib for first diaphragm (fitting part)
24 Rib for second diaphragm (fitting part)
25 groove (fitting part)
31 peripheral end 32 cap base 33 first cap rib (first rib)
34 Rib for second cap (second rib)
41 Outer end portion 42 Arc-shaped portion 43 Bonding portion 44 Recessed portion

Claims (2)

A diaphragm,
A dust cap covering the surface of the diaphragm;
In a dust cap joining structure in a speaker having a peripheral end portion of the diaphragm and an edge for fixing the peripheral end portion of the dust cap,
The inner end portion of the edge is provided with an adhesive portion for bonding and fixing the peripheral end portion of the dust cap,
On the surface facing the peripheral end portion of the dust cap in the adhesive portion, a recess into which an adhesive is injected is formed,
A dust cap joining structure in a speaker, wherein a first rib that enters the recess is formed at a peripheral end of the dust cap. In the dust cap joining structure according to claim 1,
At the peripheral end of the diaphragm, a fitting portion is formed to which the edge adhesive portion is fitted,
2. A dust cap joining structure in a speaker, wherein a second rib is formed inside the first rib of the dust cap so as to overlap a side surface of the fitting portion.

Images