JP2002152887A - Diaphragm for speaker and speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a joining state between a voice coil bobbin and a diaphragm and to hardly deliver heat from the voice coil to the diaphragm. SOLUTION: A torus joining wall face 11a to circulate along a side face 2a of a voice coil bobbin 2 is formed to a diaphragm 1, and projections 14 projected in a direction of normal line o an inner circumferential face are formed to the inner circumferential face of the joining wall face 11a at an equal interval along the circumferential direction of the inner circumferential face. Then in the case of mounting the diaphragm 1 on the voice coil bobbin, the projections 14 provided to the joining wall face 11a of the voice coil bobbin 2 are pressed into contact with the outer side face of the voice coil bobbin 2 and then an adhesive 7 is applied to the joining parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker diaphragm which can be optimally joined to a voice coil bobbin, and a speaker using the speaker diaphragm.

[0002]

2. Description of the Related Art FIG. 7 shows a partial sectional side view of a conventional general speaker, and its structure will be schematically described.
A speaker diaphragm (hereinafter simply referred to as a diaphragm) 1
The appearance is formed so as to form a truncated cone, and an opening 10 is provided at the center in the radial direction (a portion corresponding to the upper surface of the truncated cone; the lower end side in FIG. 7). And
The voice coil bobbin 2 having a cylindrical shape is located in the opening 10, and the circular opening edge 11 forming the opening 10 and the side surface 2 a of the voice coil bobbin 2 are brought into contact with each other so as to be in contact with each other. Thereby, the motion of the voice coil bobbin 2 is transmitted to the diaphragm 1.

[0003] A radially outer edge 12 (upper end in FIG. 7) of the diaphragm 1 is supported by the frame 4 via the edge 3. Thereby, the diaphragm 1 is configured to be supported on the outer peripheral side.

[0004] Also, the side surface 2a of the voice coil bobbin 2
A damper 5 for applying elastic force to the voice coil bobbin 2 to regulate the position of the voice coil bobbin 2 is interposed between the voice coil bobbin 2 and the frame 4. Further, a cap 6 is provided on the inner surface side of the diaphragm 1 so as to cover the upper end surface of the voice coil bobbin 2.

[0005] In such a loudspeaker, the joint between the diaphragm 1 and the voice coil bobbin 2 is shown in FIGS. 8 and 9.
This will be described with reference to FIG. FIG. 8A is a partial plan view of the diaphragm 1, and FIG. 8B is an enlarged perspective view of a part Z2 surrounded by a broken line in FIG. . FIG. 9 is an enlarged view of a portion Z1 surrounded by a broken line in FIG.

[0006] As can be seen from FIG.
Has a simple circular planar shape. As shown in FIGS. 7 and 8B, the circular opening edge 11 is bent from the skirt 12a of the diaphragm 1 so as to be parallel to the central axis Y in FIG. Have been. Thus, the circular opening edge 11 faces the side surface 2 a of the voice coil bobbin 2.

When the diaphragm 1 is joined to the voice coil bobbin 2, the inner peripheral surface of the joint wall 11a is first brought into contact with the side surface 2a, and the diaphragm 1 is held. Thereafter, as shown in FIG. 9, the adhesive 7 is poured from the inside of the diaphragm 1 to the joint with the voice coil bobbin 2 and dried. As a result, the diaphragm 1 and the voice coil bobbin 2 are joined.

[0008] A part of the adhesive 7 is applied to the joint wall 1.
It passes through a gap generated between the side surface 2a of the voice coil bobbin 1 and the side surface 1a. Adhesive 7 passing through such a gap
Is received by the damper 7, and the adhesive 7 is accumulated in a portion between the diaphragm 1 and the damper 5, as shown in FIG. When the adhesive 7 is cured, the diaphragm 1 is sandwiched in the vertical direction of the side wall 2a (direction along the central axis Y), and adheres in a stronger state.

[0009]

By the way, in the above-mentioned speaker, when the diaphragm 1 is joined to the voice coil bobbin 2, an uneven gap is formed at the joint between the joint wall surface 11a and the side surface 2a. In many cases, a contact portion and a non-contact portion exist between the two. This is the joint wall surface 11a
It is considered that this is because it is difficult to perfectly match with the circumferential shape of the side surface portion 2a. That is, if the voice coil bobbin 2 has a cylindrical shape, it is considered that this occurs because it is difficult to make the joining wall surface 11a a perfect circle that matches the cylindrical shape.

Further, when attaching the diaphragm 1 to the voice coil bobbin 2, a slight gap is required between the inner peripheral surface of the joint wall 11a of the diaphragm 1 and the side surface 2a of the voice coil 2. There is no particular problem in the presence of the contact portion and the non-contact portion between the joining wall surface 11a of the diaphragm 1 and the side surface portion 2a of the voice coil 2.

However, in the conventional loudspeaker having the above-described structure, the contact portion / non-contact portion between the joining wall surface 11a of the diaphragm 1 and the side surface portion 2a of the voice coil bobbin 2 exists without regularity. Therefore, some parts have a relatively large area and some parts have a very small area.

Therefore, the center of the diaphragm 1 and the center of the voice coil bobbin 2 may not be coincident with each other, that is, may be held in an eccentric state. When the adhesive 7 is poured in such a state, the passage of the adhesive 7 in the non-contact portion increases, and the passage of the adhesive 7 in the contact portion decreases. Therefore, the adhesive 7 along the side surface 2a of the voice coil bobbin 2
Is not uniform, and the diaphragm 1 may not be joined to the voice coil bobbin 2 in an appropriate state. This may adversely affect the performance as a speaker.

During operation of the speaker, heat is generated in a voice coil (not shown) mounted on the voice coil bobbin 2, and the heat is transmitted to the diaphragm 1 through the voice coil bobbin 2. It can be said that the larger the contact area between the joining wall surface 11a and the side surface portion 2a, the more easily this heat is transmitted to the diaphragm 1. Here, if a large amount of heat is transmitted to the diaphragm 1, thermal destruction may occur in the diaphragm 1 made of cone paper or the like. Therefore, it is necessary to prevent the heat of the voice coil from being transmitted to the diaphragm 2 as much as possible.

However, in the above-described speaker, the diaphragm 1
When the voice coil bobbin 2 and the voice coil bobbin 2 come into contact with each other in an eccentric state, a surface contact occurs, so that heat from the voice coil is easily transmitted to the diaphragm 1 side.

As described above, the bonding between the diaphragm 1 and the voice coil bobbin 2 can provide a stable bonding state without any bias while having some gaps, and also does not transmit the heat of the voice coil as much as possible. It is required to have a structure.

Accordingly, the present invention provides a speaker diaphragm which enables reliable bonding to a voice coil bobbin and is less likely to receive heat from a voice coil.
It is an object of the present invention to provide a high-performance speaker capable of performing a stable operation by using the speaker diaphragm.

[0017]

In order to achieve the above object, a speaker diaphragm of the present invention has a voice coil bobbin positioned in an opening, and an opening is formed in the speaker diaphragm joined to the voice coil bobbin. A plurality of projections whose front ends project toward the side surface of the voice coil bobbin are formed along the circumferential direction on the inner edge portion, and are joined to the voice coil bobbin via the projections.

By doing so, the diaphragm is joined to the voice coil bobbin via the projection and held. For this reason, it is possible to reduce the bonding area between the speaker diaphragm and the voice coil bobbin, and it is possible to minimize the transmission of heat generated in the voice coil to the speaker diaphragm.

Further, the speaker diaphragm and the voice coil bobbin are joined by firstly joining a projection formed on the inner edge of the speaker diaphragm to the side surface of the voice coil bobbin, and then attaching an adhesive to the joint. Is performed by pouring. In this case, by using the speaker diaphragm of the present invention, the gap at the joint between the speaker diaphragm and the voice coil bobbin becomes uniform. Thereby, a part of the poured adhesive flows out from the respective gaps in the lower direction of the diaphragm, and at this time, the adhesive is caused to flow uniformly over the entire circumference of the side surface of the voice coil bobbin. And the amount flowing out can be made appropriate. As a result, the joining state between the diaphragm and the voice coil bobbin can be made more reliable.

According to another aspect of the present invention, in addition to the above-described invention, a joining wall surface facing the voice coil bobbin is provided on an inner edge forming the opening, and a projection is formed on the joining wall surface. It is to be formed. By doing so, the strength of the inner edge portion forming the opening can be improved, and thereby the strength of the speaker diaphragm can be improved. Further, since the joining wall surface has a predetermined width, the convenience can be improved when the projection is attached.

Further, in another invention, in addition to the above-mentioned inventions, the projections are further formed at a constant pitch in the circumferential direction on the inner edge forming the opening. Things. For this reason, the respective projections are in a uniform contact state with any part of the side surface of the voice coil bobbin, and the speaker diaphragm can be stably mounted on the voice coil bobbin without bias. Thereby, the bonding state between the speaker diaphragm and the voice coil bobbin can be improved.

According to another aspect of the present invention, in addition to the above-mentioned aspects, the projection of the speaker diaphragm is formed integrally. Therefore, in the production process of the speaker diaphragm, the projections can be formed at the same time, and the production of the speaker diaphragm having the projections is facilitated.

In another aspect of the present invention, in addition to the above-described aspects, the direction of projection of the projection is a normal direction of the inner peripheral surface of the joint wall surface. With this configuration, an appropriate contact force can be applied to any position on the side surface of the voice coil bobbin, and the attachment of the speaker diaphragm to the voice coil bobbin can be made more stable. it can.

According to another aspect of the present invention, there is provided a speaker having a voice coil bobbin on which a voice coil is mounted, and a speaker diaphragm for positioning the voice coil bobbin in the opening and bonding the voice coil bobbin in a state of being joined thereto. Any one of the speaker diaphragms of the above-described inventions is used.

By using such a speaker diaphragm for a speaker, it is possible to minimize the transfer of heat generated in the voice coil to the speaker diaphragm during the operation of the speaker. That is, since the speaker diaphragm is attached to the voice coil bobbin with the protrusion abutting on the side surface of the voice coil bobbin, the contact area with the voice coil bobbin can be minimized,
Thereby, transmission of heat generated in the voice coil can be suppressed to a small value.

Further, the speaker diaphragm can be stably mounted on the voice coil bobbin without bias.
Thereby, the bonding state between the speaker diaphragm and the voice coil bobbin can be improved.

In another aspect of the present invention, in addition to the above-described speaker, the bonding between the voice coil bobbin and the speaker diaphragm is performed with an adhesive in a state where the protrusion contacts the side surface of the voice coil bobbin. It was decided that. In this case, at the joint between the speaker diaphragm and the voice coil bobbin, a uniform gap is formed at a predetermined interval between the speaker diaphragm and the voice coil bobbin.

As a result, a part of the poured adhesive flows out from the respective gaps in the downward direction of the speaker diaphragm. At this time, the adhesive spreads over the entire periphery of the side surface of the voice coil bobbin. And make it flow out evenly. At the same time, the amount flowing out can be made appropriate. As a result, the bonding state between the speaker diaphragm and the voice coil bobbin can be made more reliable.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a speaker diaphragm and a speaker according to the present invention will be described with reference to FIGS. FIG. 1 is a side view for explaining the structure of the speaker of the present invention, and is a half sectional view. In this figure, since the basic configuration of the speaker is almost the same as that of FIG. 7 described as the related art, the same parts are denoted by the same reference numerals. FIG. 2 is a partial plan view of the diaphragm 1, and FIG. 3 is an enlarged view of a portion Z3 surrounded by a broken line in FIG.

The present invention relates to a joint between a diaphragm 1 of a speaker and a voice coil bobbin 2. Diaphragm 1
Is formed into a truncated cone shape using, for example, cone paper having a predetermined thickness as a material. Therefore, the diaphragm 1 has a circular planar shape, but at the radial center of the circular shape,
An opening 10 is formed. The edge of the opening 10 is a circular opening edge 11, and an annular joining wall surface 11a present on the inner peripheral side of the circular opening edge 11 is substantially perpendicular to the radial direction of the circular opening edge 11. It is formed to perform.

As shown in FIG. 2, a plurality of projections 14 are provided at a predetermined pitch on the inner peripheral surface of the joining wall surface 11a over the entire circumference in the circumferential direction.
The peripheral projections 13 are formed by these. The projection 14 constituting the peripheral projection 13 has a triangular planar shape. The apex (hereinafter referred to as the tip) of the protrusion 14 protrudes toward the center of the diaphragm 1 (in the direction normal to the circular opening edge 11). Each of the three-dimensional shapes of the projections 14 has a triangular prism shape with a short dimension in the thickness direction, as can be seen from an enlarged perspective view in which a portion Z4 surrounded by a broken line in FIG.

The projection 14 (circular projection 13)
Is formed of a material whose tip is slightly bent along the side surface portion 2a of the voice coil bobbin 2 or whose tip is somewhat crushed and deformed (elastic deformation or the like). As such a material, the diaphragm 1 and the circumferential protrusion 13 may be formed integrally with the same material (cone paper or the like) as the diaphragm 1, and a material that is elastically deformed separately from the diaphragm 1 ( For example, a configuration may be used in which the peripheral projections 13 (projections 14) are attached to the diaphragm 1 or the like.

As described above, the diaphragm 1 is connected to the joining wall surface 11a.
Since the diaphragm 1 has a circumferential projection 13 as shown in FIG. 2, when the diaphragm 1 is held by the voice coil bobbin 2 (see FIG. 1), the tip of the projection 14 contacts the side surface 2a of the voice coil bobbin 2. It is in a state of contact. At this time, the tips of the projections 14 are slightly bent along the side surface portion 2a of the voice coil bobbin 2, or are brought into contact with the tips being slightly crushed and deformed (elastic deformation or the like).

After holding the diaphragm 1 on the voice coil bobbin 2 in this manner, the diaphragm 1
The adhesive 7 (see FIG. 3) is poured from the inside (upper side of FIG. 1). A part of the adhesive 7 that has been poured is
Through the triangular space 15 (see FIG. 4) formed between the two projections 14 and the side surface 2 a of the voice coil bobbin 2, it flows out to the lower side of the diaphragm 1. The adhesive 7 is applied to the side surface 2 a of the voice coil bobbin 2 and the damper 5.
And reach the connection. Figure 3 shows this situation.
It is.

As described above, when the adhesive 7 is poured into the joint between the diaphragm 1 and the voice coil bobbin 2, a part of the adhesive 7 passes through the space 15 formed at the joint between the voice coil bobbin 2 and the diaphragm 1. It also flows under the diaphragm 1. Thereby, the diaphragm 1 is also adhered to the voice coil bobbin 2 from below, so that the diaphragm 1 and the voice coil bobbin 2 can be more securely joined.

As described above, the connection between the diaphragm 1 and the voice coil bobbin 2 is performed. The joined state is such that the tip of each of the projections 14 provided on the diaphragm 1 side is in contact with the side surface portion 2a of the voice coil bobbin 2, so that the voice coil bobbin 2 of the diaphragm 1 Is only the tip of each projection 14. Therefore, the contact area of the diaphragm 1 with the voice coil bobbin 2 can be made extremely small.
This makes it difficult for the heat generated from the voice coil (not shown) to be transmitted to the diaphragm 1 and minimizes the amount of heat transmitted to the diaphragm 1.

Further, the protrusions 14 are arranged so as to make one round around the inner circumference at equal intervals along the inner circumference of the joint wall surface 11a, and
The circumferential projection 13 is formed by being provided so as to protrude in the normal direction of the joining wall surface 11a. For this reason, the protrusion 1
The tip of each of the voice coil bobbins 2 comes into contact with the side surface 2a of the voice coil bobbin 2 with an equal force at any position in the circumferential direction of the side surface 2a of the voice coil bobbin 2. In addition, since each of the protrusions 14 abuts in a state in which the protrusions 14 are slightly bent or elastically deformed, the diaphragm 1 is held in a stable state without bias to the voice coil bobbin 2.

Then, when the adhesive 7 is poured in such a state, the adhesive 7 flows through the spaces 15 which are present at equal intervals and also flows out below the diaphragm 1. As a result, as described above, the adhesive 7 reaches the connection between the side surface 2 a of the voice coil bobbin 2 and the damper 5. For this reason, the diaphragm 1 is adhered to the voice coil bobbin 2 also on the back side of the diaphragm 1, and furthermore, the adhesion state is obtained uniformly over the entire periphery of the side surface 2 a of the voice coil bobbin 2. Bonding to the voice coil bobbin 2 can be ensured.

Each of the above embodiments is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. It is. For example, the joining wall 1 of the diaphragm 1
The protrusions 14 formed in 1a are not limited to those described in the above embodiment. For example, as shown in FIG.
The protrusion 14a may have a larger triangular shape. On the contrary, although not shown here, the protrusion 14a may have a finer triangular shape than the protrusion 14 described in the above embodiment. Good. Further, as shown in FIG. 5, the protrusions 14b may have a triangular shape with a gentle hypotenuse and a large pitch, and the shape of the protrusions may not be triangular, as shown in FIG. Alternatively, the protrusion 14c may have a semicircular shape, and various shapes are conceivable.

The point is that the diaphragm 1 is biased with respect to the voice coil bobbin 2 in a state where substantially equally spaced gaps are formed along the circumferential direction of the side surface portion 2a at the joint between the diaphragm 1 and the voice coil bobbin 2. What is necessary is just to be in the state which can be stably joined without it. At the same time, the shape of the diaphragm 1 and the voice coil bobbin 2 as long as the contact between the diaphragm 1 and the voice coil bobbin 2 is made as small as possible and the heat of the voice coil is made as difficult as possible is sufficient.

Therefore, the shape of the projection 14 formed on the joint wall surface 11a of the diaphragm 1 is variously modified as in the examples shown in FIGS. It is possible to change the stability of the bonding state, the thermal conductivity, and the like, and the amount of the adhesive 7 flowing into the lower side of the diaphragm 1 can be changed. The optimum shape may be selected according to the characteristics of the speaker.

Further, the peripheral projection 13 is formed in a ring shape separate from the diaphragm 1, and after attaching the ring-shaped peripheral projection 13 to the voice coil bobbin 2, the diaphragm 1 is joined to the peripheral projection 13. It may be configured. Further, in the above-described embodiment, the protrusions 14 are provided on the joining wall surface 11a of the diaphragm 1.
Is provided, but the diaphragm 1 has a joining wall surface 11a.
May be provided, and the protrusions 14 may be provided directly on the inner edge in a state where the protrusions are omitted. In addition, the inside edge part here is a concept including the case where the joining wall surface 11a exists.

[0043]

As described above, the diaphragm of the present invention is in a state where the diaphragm is joined to the voice coil bobbin via the projection and held. For this reason, it is possible to reduce the bonding area between the speaker diaphragm and the voice coil bobbin, and it is possible to minimize the transmission of heat generated in the voice coil to the speaker diaphragm.

Further, the speaker diaphragm and the voice coil bobbin are joined by firstly joining a projection formed on the inner edge of the speaker diaphragm to the side surface of the voice coil bobbin, and then attaching an adhesive to the joint. Is performed by pouring. In this case, by using the speaker diaphragm of the present invention, the gap at the joint between the speaker diaphragm and the voice coil bobbin becomes uniform. Thereby, a part of the poured adhesive flows out from the respective gaps in the lower direction of the diaphragm, and at this time, the adhesive is caused to flow uniformly over the entire circumference of the side surface of the voice coil bobbin. And the amount flowing out can be made appropriate. As a result, the joining state between the diaphragm and the voice coil bobbin can be made more reliable.

[Brief description of the drawings]

FIG. 1 is a partial side sectional view illustrating the structure of a speaker according to the present invention.

FIGS. 2A and 2B are diagrams showing a part of the diaphragm 1 shown in FIG. 1, wherein FIG. 2A is a plan view and FIG.

FIG. 3 is an enlarged view of a portion Z3 surrounded by a broken line in FIG.

FIG. 4 is a partial plan view showing a modification of the diaphragm 1;

FIG. 5 is a partial plan view showing a modification of the diaphragm 1;

FIG. 6 is a partial plan view showing a modification of the diaphragm 1;

FIG. 7 is a partial side sectional view illustrating the structure of a conventional speaker.

8A and 8B are diagrams showing a part of the diaphragm 1 shown in FIG. 7, wherein FIG. 8A is a plan view and FIG. 8B is a perspective view.

9 is an enlarged view of a portion Z1 surrounded by a broken line in FIG.

Claims (7)

[Claims] 1. A speaker diaphragm which has a voice coil bobbin positioned in an opening and is joined to the voice coil bobbin, wherein an inner edge forming the opening has a tip projecting toward a side surface of the voice coil bobbin. A speaker diaphragm, wherein a plurality of bodies are formed along a circumferential direction, and the body is joined to the voice coil bobbin via the protrusions. 2. A joint wall facing the voice coil bobbin is provided on an inner edge forming the opening, and the projection is formed on the joint wall. Item 2. A speaker diaphragm according to item 1. 3. The vibration for a loudspeaker according to claim 1, wherein the projections are formed at a constant pitch in a circumferential direction on an inner edge forming the opening. Board. 4. The speaker diaphragm according to claim 1, wherein the projection is formed integrally. 5. The loudspeaker diaphragm according to claim 2, wherein the projection direction of the projection is a normal direction of an inner peripheral surface of the joining wall surface. 6. A speaker comprising: a voice coil bobbin to which a voice coil is mounted; and a speaker diaphragm for bonding the voice coil bobbin in a state where the voice coil bobbin is positioned in an opening and bonding to the voice coil bobbin. A speaker using the speaker diaphragm according to any one of claims 1 to 5. 7. The speaker according to claim 6, wherein the bonding between the voice coil bobbin and the speaker diaphragm is performed with an adhesive in a state where the protrusion contacts the side surface of the voice coil bobbin. .