JP3491572B2 - Speaker unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker unit, and more particularly to a speaker unit that enables a voice coil bobbin to be firmly attached to a diaphragm and can be easily positioned during attachment.

[0002]

2. Description of the Related Art In a conventional speaker unit, as shown in FIGS. 5 and 6, a cylindrical voice coil bobbin 2 around which a voice coil 3 is wound is inserted into an inner circumference of a diaphragm 1 and fixed with an adhesive 4. Things were being used. The periphery of the diaphragm 1 is supported by a frame (not shown), and the voice coil 3 is arranged in the magnetic gap of the magnetic circuit to form a speaker unit.

However, in the above-mentioned fixing structure for the voice coil bobbin and the diaphragm, there is a problem that the bonding position between the voice coil bobbin and the diaphragm is difficult to determine, and the position of the voice coil bobbin with respect to the diaphragm easily varies. Also, if the dimensions of the voice coil bobbin and the diaphragm vary, the strength of fitting is not stable and the adhesive strength also varies. If the adhesive strength is not sufficient, the voice coil bobbin 2 may come off from the diaphragm 1 when a high-power signal is input.

In the speaker diaphragm mounting structure proposed in Japanese Unexamined Patent Publication No. 10-28300, a protrusion is provided on the outer periphery of the voice coil bobbin, and the diaphragm is abutted and fixed to this protrusion. According to this method, the contact pressure between the protrusion and the vibration plate increases and positioning is easy, but there is a problem in that the position in the circumferential direction cannot be determined. Further, since the protrusion is formed on the voice coil bobbin by molding, there is a problem that the manufacturing cost becomes high.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to easily position the voice coil bobbin and the diaphragm in the circumferential direction and the axial direction. Another object of the present invention is to provide a speaker unit capable of firmly bonding the voice coil bobbin and the diaphragm.

[0006]

In the speaker unit of the present invention, a portion surrounded by a notch cut into a fitting portion with the voice coil bobbin in a substantially U shape is bent toward the fitting surface side of the voice coil bobbin. A diaphragm having a protruding and protruding first tongue and a portion surrounded by a notch cut in a substantially U-shape in the fitting portion with the diaphragm are bent toward the fitting surface side of the diaphragm. A voice coil bobbin having a protruding second tongue piece, wherein the diaphragm and the voice coil bobbin are fixed to each other with the first tongue piece and the second tongue piece meshing with each other. Is.

Further, in the speaker unit, the first tongue piece is set such that the base of the bending of the portion surrounded by the substantially U-shaped cut is close to the inner circumference of the diaphragm. The second tongue piece is such that the base of the bending of the portion surrounded by the substantially U-shaped cut is set on the side away from the voice coil wound around the voice coil bobbin.

In each of the speaker units,
The first tongue piece and the second tongue piece are respectively bent at an angle which, when meshed with each other, generates a restoring force that draws the mating mating tongue piece toward the own tongue piece side.

Further, in each of the speaker units, the first tongue piece and the second tongue piece are adhered to each other.

[0010]

DETAILED DESCRIPTION OF THE INVENTION A speaker unit according to an embodiment of the present invention will be described with reference to the drawings. 1 is a perspective view showing an essential part of a speaker unit according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the essential part. As shown in the figure, a cylindrical voice coil bobbin 2 around which a voice coil 3 is wound is inserted through the inner circumference of the diaphragm 1 and fixed with an adhesive 4. Here, the outer peripheral dimension of the voice coil bobbin 2 and the inner peripheral dimension of the diaphragm 4 are such that when the voice coil bobbin 2 is inserted into the inner periphery of the diaphragm 1, the both fit.

FIG. 3 (a) is a partially enlarged sectional view of the embodiment, and FIG. 4 is an exploded perspective view showing a main part of the speaker unit of the embodiment. As shown in FIG. 4, a U-shaped cut is made in the bonding portion of the diaphragm 1 with the voice coil bobbin 2,
The inner portion surrounded by the cut line is bent toward the voice coil bobbin 2 side (toward the inner peripheral side of the diaphragm 1) and protrudes,
A tongue piece 1a and a hole 1b are formed. Where tongue 1a
Is set on the side where the root of the bending of the inner portion surrounded by the cut is close to the inside of the diaphragm 1.

Further, a U-shaped cut is made in the bonding portion of the voice coil bobbin 2 with the diaphragm 1, and the inner portion surrounded by the cut is on the diaphragm 1 side (outer than the outer periphery of the voice coil bobbin 2). 2) It is bent and protrudes, and a tongue piece 2a and a hole 2b are formed. Where the tongue 2a
Is set such that the root of the bending of the inner portion surrounded by the cut is away from the voice coil 3 wound around the voice coil bobbin 2.

Regarding the bending angles of the tongues 1a and 2a, when the diaphragm 1 and the voice coil bobbin 2 are engaged with each other when the tongues 1a and 2a are engaged with each other as described later, they are mated with each other. Each side tongue is bent at an angle so as to generate a restoring force that draws the side tongue toward the side of the tongue.

As shown in FIG. 4, when the voice coil bobbin 2 is inserted into the diaphragm 1 in the direction A, the tongue 1a is forcibly deformed in the direction of arrow b and the tongue 2a is forced in the direction of arrow c. When the tongue piece 2a passes over the tongue piece 1a, the deformation of the tongue pieces 1a and 2a returns. After that, when the voice coil bobbin 2 is pulled in the direction opposite to the A direction, the tongue piece 2a and the tongue piece 1a mesh with each other. In this case, when the tongue pieces 1a and 2a are meshed with each other, the mating mating tongue pieces are in a state of being pulled toward each other by the restoring force toward the own tongue piece side, and the meshing is strong.

In this state, as shown in FIG. 3A, the adhesive 4 is injected between the voice coil bobbin 2 and the diaphragm 1 to bond the voice coil bobbin 2 and the diaphragm 1 together. Since the tongue piece 2a and the tongue piece 1a are firmly meshed with each other, the fixing strength between the voice coil bobbin 2 and the diaphragm 1 is increased.

FIG. 3B shows a modification of the embodiment. In this example, as in the case shown in FIG. 3A, the adhesive 4 is injected between the voice coil bobbin 2 and the diaphragm 1 so that the fitting cylindrical surface between the voice coil bobbin 2 and the diaphragm 1 is formed. Although the adhesive 4 is used for the adhesion, the adhesive 5 is further injected through the hole 1b to bond the mating surfaces of the tongue 2a and the tongue 1a. According to such a bonding method, the voice coil bobbin 2 and the diaphragm 1 can be bonded more firmly.

[0017]

According to the speaker unit of the present invention,
The mounting strength of the voice coil bobbin and the diaphragm can be increased without increasing the number of parts, and the quality of the speaker unit can be stabilized. Moreover, the voice coil bobbin and the diaphragm can be easily positioned, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a speaker unit according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the same main part.

FIG. 3 (a) is a partially enlarged cross-sectional view of the main part of FIG.
(B) is a partial enlarged cross-sectional view of a main part of a modified example of the same embodiment.

FIG. 4 is an exploded perspective view showing a main part of the speaker unit.

FIG. 5 is a perspective view showing an example of a portion of a conventional speaker unit.

FIG. 6 is a cross-sectional view showing the same portion.

[Explanation of symbols]

1 diaphragm, 1a tongue, 1b hole 2 voice coil bobbin, 2a tongue, 2b hole 3 voice coils 4,5 adhesive

Claims (4)

(57) [Claims] 1. A first tongue piece that is bent and protrudes toward a fitting surface side of the voice coil bobbin in a portion surrounded by a cut cut in a substantially U shape in a fitting portion with the voice coil bobbin. A voice having a vibrating plate and a second tongue portion, which is surrounded by a notch cut in a substantially U-shape in a fitting portion of the vibrating plate, is bent and protrudes toward the fitting surface side of the vibrating plate. A speaker unit comprising a coil bobbin, wherein the diaphragm and the voice coil bobbin are fixed to each other in a state where the first tongue piece and the second tongue piece are meshed with each other. 2. The first tongue piece is set such that the base of the bending of the portion surrounded by the substantially U-shaped cut is close to the inner circumference of the diaphragm, and the second tongue piece is also provided. The speaker unit according to claim 1, wherein the base of the bending of the portion surrounded by the substantially U-shaped cut is set on the side away from the voice coil wound around the voice coil bobbin. 3. The first tongue piece and the second tongue piece are each bent at an angle that generates a restoring force that draws the mating mating tongue piece toward the own tongue piece side when meshed with each other. The speaker unit according to claim 1, wherein the speaker unit is a speaker unit. 4. The speaker unit according to claim 1, wherein the first tongue piece and the second tongue piece are adhered to each other.