JPH0424713Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a speaker, and particularly to a coupling structure between a diaphragm and a driving member of a speaker.

BACKGROUND ART Dynamic speakers that have been widely used conventionally use a cone-shaped diaphragm made of a fiber material mainly made of pulp.

In such a speaker, as shown in FIG. 1, the outer edge of a diaphragm 1 is held by an edge 2, and one tip of a voice coil bobbin 3 is inserted into the center of the diaphragm 1 and bonded to it. There is. A coil 3a is attached to the other end of the voice coil bobbin 3.
The voice coil bobbin 3 is wound and inserted into the magnetic air 4, and the entire voice coil bobbin 3 is held movably in the direction of its central axis by a damper 5. The adhesive part between the diaphragm 1 and the voice coil bobbin 3, indicated by the circle A in FIG. 1, is as shown in FIG. That is, the inner wall surface of the adhesive portion 7 and the outer circumferential wall of the voice coil bobbin 3 are bonded and connected via an adhesive 6.

Traditionally, such diaphragms have been manufactured as shown in Figures 3a and b.
and c. Paper making cone 1 made by paper making mold 8 as shown in FIG. 3a
1 is formed into a press cone 12 having a uniform density as shown in FIG. 3b through a dry pressing process. Thereafter, the unnecessary outer and inner diameter portions of the press cone 12 are removed to obtain the conventional diaphragm 1 shown in FIG. 3c.

The adhesive portion between the diaphragm and the voice coil bobbin is an important part that accurately transmits the vibrations of the voice coil bobbin 3 to the diaphragm. Therefore, it is essential that the diaphragm 1 and the voice coil bobbin 3 be bonded together strongly and without errors such as eccentricity. Therefore, in the speaker manufacturing process, it is required to prevent undesirable deformation of the neck portion of the diaphragm and to accurately attach the diaphragm to the voice coil bobbin.

However, in the diaphragm 1 manufactured by the conventional method, especially the neck portions 7, that is, the adhesive portions, the neck portions 7 of the diaphragm or the adhesive portions of the diaphragm may be damaged during transportation or storage of the diaphragm after manufacture or during speaker assembly work. Undesirable deformation may occur in the neck portion 7 due to collision or contact with other objects.

Furthermore, since the diaphragm 1 is bonded only to the outer circumferential wall of the voice coil bobbin 3 via the adhesive 6 as shown in FIG. By increasing the length of 7, it is necessary to increase the bonding area and use a large amount of adhesive. This not only increases the chance of neck enlargement and undesirable deformation, but also limits the frequency response characteristics of the manufactured loudspeaker.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a coupling between a drive plate and a drive member, that is, a voice coil bobbin, which prevents undesirable deformation of the adhesive portion between the diaphragm and the voice coil bobbin after manufacture and achieves good driving force transmission characteristics. It's about providing structure.

The present invention strengthens the neck part, that is, the adhesive part of the diaphragm by forming a groove with a substantially L-shaped cross section on the annular adhesive surface of the diaphragm to the voice coil bobbin.
A speaker diaphragm drive unit that increases the area of the bonding surface and realizes accurate bonding by abutting and bonding the tip end surface of the voice coil bobbin and the surrounding wall in the vicinity thereof to the groove having the approximately L-shaped cross section over the entire circumference. Because it is a coupled structure, it makes the speaker assembly work easier and more accurate, improves the product yield, and further improves the driving force transmission characteristics between the diaphragm and the voice coil bobbin.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figures 4a, b, c and d are cross-sectional views of the diaphragm of the speaker of the present invention, showing the manufacturing process. First, the fourth
The paper making cone 11 made by the paper making mold 2 as shown in FIG.
is formed into. Thereafter, the center part of the press cone 12 is press-formed by pressing with a predetermined mold or the like, and the approximately L-shaped cross section consisting of the high-density part 16 and the low-density part 17 as shown in FIG. A press cone 12 is provided with a gluing portion having a letter-shaped cross section. The unnecessary outer and inner diameter portions of the press cone 12 are removed to obtain the diaphragm of the present invention shown in FIG. 4d.

In assembling the speaker of the present invention, as shown in FIG. The lower density hanging portion 17 of the bonded portion is bonded. Further, the drive plate 1 of the present invention has a shape as shown in FIGS. 5b and 5c.
Similarly, with adhesive 6, the tip surface of the voice coil bobbin 3 and the part 16 where the density of the adhesive part is high are adhered, and the inner circumferential wall near the tip surface of the bobbin 3 and the hanging part 17 where the density of the joint part is low. Glue.

By press forming with a predetermined pressing force, a high-density portion is provided at the bonded portion of the diaphragm to impart rigidity, and at the same time, a groove having a substantially L-shaped cross section can be formed, thereby stabilizing the dimensions of the bonded portion.

FIG. 6 shows a cross section of the speaker according to the present invention,
The part indicated by a circle B shows the coupling structure between the diaphragm 15 and the voice coil bobbin 3 as shown in FIG. 5a.

In addition to press molding as in the embodiment, there are other methods, such as a method of forming a press cone 12 having a groove with a substantially L-shaped cross section directly from the paper making cone 11 at the adhesive portion.

Effects According to the present invention, since the height of the neck portion of the diaphragm can be made lower than that of conventional ones, it is possible to avoid undesirable deformation due to contact or collision of the neck portion when diaphragms are stacked directly on top of each other during transportation or storage. It is. Furthermore, in addition to bonding only the outer peripheral wall of the voice coil bobbin as in the past, it is also bonded to the tip surface of the voice coil bobbin, which is perpendicular to the driving direction, so the bonding surface is expanded and a stronger bond is achieved than in the past, resulting in vibration of the voice coil bobbin. The driving force is efficiently transmitted to the plate. Therefore, the speaker assembly work can be performed easily and accurately, the yield of products is improved, and speakers of stable quality can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of a conventional speaker.
FIG. 2 is an enlarged partial sectional view of the part indicated by circle A in FIG. 1, and FIGS. Figures 4a, b, c and d are partial sectional views showing the manufacturing process of the speaker diaphragm according to the present invention,
FIGS. 5a, b, and c are enlarged partial cross-sectional views showing a coupling structure between a speaker diaphragm and a voice coil bobbin according to the present invention, and FIG. 6 is a partial cross-sectional view of a speaker including a speaker diaphragm drive unit coupling structure according to the present invention. It is a diagram. Explanation of symbols of main parts, 1... diaphragm, 8...
Paper making mold, 2...Etsuji, 11...Paper making cone,
3...Voice coil bobbin, 12...Press cone, 3a...Coil, 4...Magnetic air, 15...
The diaphragm of the present invention, 5... Damper, 16... Adhesive part with high density, 6... Adhesive, 17... Adhesive part with low density, 7... Network part (adhesive part),
30... Central axis.

Claims (1)

[Claims for Utility Model Registration] A combination of a speaker diaphragm made of a fiber material and a voice coil bobbin inserted into a magnetic air, wherein the voice coil bobbin has an annular tip surface that intersects its central axis at a substantially right angle. The adhesive portion of the diaphragm to the voice coil bobbin includes an annular contact surface that intersects the central axis of the voice coil bobbin at a substantially right angle, and a tube portion that extends from the annular contact surface in parallel to the central axis. A joining structure comprising: the annular tip surface and the annular contact surface are bonded together, and a peripheral wall near the annular tip surface and a peripheral wall of the tube portion are bonded.