JPH0851691A - Loudspeaker - Google Patents

Abstract

PURPOSE: To provide a high-pitched voice device with a bead which can be used at a high temperature. CONSTITUTION: At the high-pitched voice device 10 with a metallic high-pitched voice diaphragm 12, a high-pitched voice device frame 11 and the bead 15 connecting the diaphragm 12 to the frame 11, the bead 15 is made of a metallic film like copper-beryllium alloy and the surface areas of the bead 15 and the diaphragm 12 overlapped for joining the bead 15 and the diaphragm 12 are made of metal which can be ultrasonic-welded to each other. Though the bead 15 and the frame 11 can also be ultrasonic-welded, it can also be fixed to a screw 18 as is shown on the left side of a graphic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a loudspeaker,
In particular, it relates to a so-called bead structure for mounting the loudspeaker diaphragm to the loudspeaker frame.

[0002]

2. Description of the Prior Art In conventional technology, the upper rim of a loudspeaker diaphragm is attached to a loudspeaker frame by an annular bead. Known beads are made of either paper or paperboard, plastic or rubber and cover the separating space between the upper rim of the loudspeaker diaphragm and the loudspeaker frame, the beads being at least in the separating space. Contains one fold. Depending on the construction, the fold zenith faces either the direction in which the sound radiates from the loudspeaker diaphragm or the direction of the magnet system. This fold in the bead is needed to allow the upper rim of the loudspeaker diaphragm to follow the vibrations caused by the voice coil. Therefore, for the connection with the vibrating part of the loudspeaker,
Obviously, such beads should have as little or uniform resistance to oscillatory movements as possible to impair the efficiency of the loudspeaker or to prevent acoustic distortion. Furthermore, the bead must also prevent the upper rim of the loudspeaker diaphragm from displacing in the radial direction, ie in the direction intersecting the oscillatory movement. The known structures and materials are able to satisfy this condition satisfactorily.

[0003]

However, 150
There are conditions of loudspeaker use where at temperatures above 0 ° C corrosive gas acts on the loudspeaker diaphragm or bead. In such cases the loudspeaker diaphragm is made of metal, but the useful life of the commonly used bead material is limited under such circumstances. Furthermore, in the prior art, the beads are attached to the rest of the loudspeaker (the loudspeaker diaphragm and the loudspeaker frame) with an adhesive, so that such loudspeakers will be exposed to temperatures above 150 ° C. An additional problem with adhesive bonding occurs when exposed to light. As a result, the adhesive bond is no longer stable under mechanical loading in this temperature range. Structures in which the loudspeaker diaphragm and the bead are made in one piece are also known, but such a one piece combination can only be made of paperboard or paper, or plastic, and Since such materials cannot be used in the temperature range mentioned above, they cannot solve the problems mentioned above.

Therefore, it is an object of the present invention to provide a bead for a loudspeaker which avoids the known bead temperature problems that occur in the ordinary art.

[0005]

This object is achieved by the loudspeaker of the present invention. The present invention relates to a loudspeaker for an acoustic signal, which comprises a loudspeaker diaphragm made of metal, a loudspeaker frame, and a bead connecting the loudspeaker diaphragm to the loudspeaker frame. Made of foil, at least the surface areas of the bead and the loudspeaker diaphragm, which are overlapped to join the bead and the loudspeaker diaphragm, are made of metal that can be ultrasonically welded to each other. It is characterized by being Advantageous configurations of the invention are described in claims 2 to 4.

The effects of the beads themselves due to the effects of temperature and / or gas are eliminated when the beads are made of metal foil as claimed in claim 1. Surprisingly 3
It was found that metal foils with a thickness between 0 and 150 μm have similar properties to the bead materials used up to now. At the same time, if at least the surface area of the bead and the loudspeaker diaphragm, which are overlapped for joining, is made of ultrasonically weldable metal, the bead and the loudspeaker diaphragm will be resistant to high temperatures. They are joined together using ultrasonic welding technology. In this connection, it is particularly advantageous to make the beads and / or the loudspeaker diaphragm completely of ultrasonically weldable metal. The reason for this is that in such a case the unique coating of each joint area can be dispensed with.

When the bead foil is made of a copper-beryllium alloy according to claim 2, the bead has a high cyclic bending fatigue strength. Moreover, beads made of such materials can be easily deep drawn to give the desired shape. Copper-beryllium alloys can also be easily welded to aluminium, and the loudspeaker diaphragm of high temperature loudspeakers must be made of aluminum for reasons of weight and cost, so in this case the beads And the loudspeaker diaphragm can be joined particularly easily and quickly.

When the bead shape has one or more pleats, the diaphragm can be caused to perform a large amplitude movement. For the purpose of this application, the shape has a bulge, whereby it is between 0 ° and 180 ° or between 180 ° and 3 °.
Corresponds to a sinusoidal course between 60 °.

In this connection, it has already been pointed out that the pleats in the bead shape do not necessarily have to have the same dimensions.

If the surface area of the bead and the loudspeaker frame that overlap for joining are made of an ultrasonically weldable metal according to claim 4, the joint between the bead and the loudspeaker frame is It can be easily achieved using sonic welding techniques.

[0011]

The invention will be described in more detail by means of a single drawing.

FIG. 1 shows a side cross-sectional view of the upper portion of a loudspeaker 10, showing an embodiment in which the right and left views with respect to the center line are different.

In FIG. 1, a loudspeaker 10 comprises a loudspeaker frame 11 and a conical diaphragm 12. The loudspeaker diaphragm 12 is inserted in the loudspeaker frame 11. Loudspeaker diaphragm 12, annular upper rim in both exemplary configurations
13 is the rim of the loudspeaker frame 11 by an annular bead 15.
Installed on 14. The rest of the loudspeaker 10 is not shown for clarity.

The bead 15 which completely covers the space between the rims 13 and 14 is made of thin metal foil. In both exemplary embodiments, the metal foil is composed of a copper-beryllium alloy and has a thickness of about 100 μm. By using beads 15 made entirely of copper-beryllium alloy, it has the advantage of having high cyclic bending fatigue strength, and as will be shown later, it also has a loudspeaker diaphragm 12 and / or Or it can be easily joined to the loudspeaker frame 11. This bead 15 and loudspeaker frame 11
And / or a simple bond with the loudspeaker diaphragm 12 is only a metallization such that the beads themselves are made of different materials and can be ultrasonically welded to the material of diaphragm 12 and / or frame 11. It can also be realized if the

In the embodiment on the right side of the drawing, according to the definition above, a bead 15 shape is shown having approximately three pleats 16 spanning the distance between the rim 12 and the rim 13 (sic). Each of these three pleats 16 has the same curvature. Such beads 15 are used when the loudspeaker diaphragm 12 has an amplitude of 10 mm or more.

Flanges 17.1 and 17.2, made as one piece with bead 15, are located on each side of the pleated portion of bead 15. Loudspeaker 10 tuned for immediate operation in left and right views
And the rims 14,1 of the loudspeaker frame 11 and the loudspeaker diaphragm 12
Flanges 17.1 and 17.2 overlying 3 are shown. Both the loudspeaker diaphragm 12 and the loudspeaker frame 11
Made of aluminum. By selecting the materials of the loudspeaker frame 11, the loudspeaker diaphragm 12, and the beads 15, the flanges 17.1 and 17.2 can be ultrasonically welded to the rims 13,14. In this connection, it is not necessary for the loudspeaker frame 11 and the loudspeaker diaphragm 12 to be made entirely of aluminum for a welded joint between the bead 15 and the loudspeaker diaphragm 12 or the loudspeaker frame 11. It is pointed out that there is no. Rather, the welding between the bead 15 and the loudspeaker diaphragm 12 in order to coat the ultrasonically weldable metal only on the surface areas of the frame 11 and diaphragm 12 which contact the flanges 17.1 and 17.2 of the bead 15. It is sufficient to realize a joint, or a weld joint between the bead 15 and the loudspeaker frame 11.

The embodiment on the left side of the drawing differs from the embodiment on the right in that the shape of the bead 15 over the distance between the rims 13 and 14 has only two pleats 16. The dimensions of the bend radii of the two pleats 16 in the embodiment on the left side of the drawing are different. Loudspeaker diaphragm of the structure of the embodiment on the left side of the drawing
12 is also made of aluminum for reasons of weight savings and temperature resistance and the flange 17.1 is attached to the upper rim 13 of the loudspeaker diaphragm 12 by ultrasonic welding. The other flange 17.2 of the bead 15 is attached to the rim 14 of the loudspeaker frame 11 by a rivet 18.
The reason is that the weight of the joint in this area
In contrast to the joint between 17.1 and the rim 13, it plays only a minor role. In another embodiment, not shown, the joint between the flange 17.2 and the loudspeaker frame 11 can also be made using screws. If the joint between the flange 17.2 and the loudspeaker frame 11 is made using screws or rivets, the loudspeaker frame can be made of any metal that is less costly than aluminum.

[Brief description of drawings]

FIG. 1 is a side sectional view of the upper portion of two loudspeakers having different structures.

Claims (4)

[Claims] 1. A loudspeaker for an acoustic signal, comprising a metallic loudspeaker diaphragm, a loudspeaker frame, and a bead connecting the loudspeaker diaphragm to the loudspeaker frame. Made of metal foil, at least the surface area of the bead and the loudspeaker diaphragm that are overlapped to join the bead and the loudspeaker diaphragm are made of metal that can be ultrasonically welded to each other. A high-pitched loudspeaker. 2. The loudspeaker according to claim 1, wherein the bead foil is made of a copper-beryllium alloy. 3. The loudspeaker according to claim 1, wherein the shape of the bead includes at least a fold. 4. The bead and the surface area of the loudspeaker frame, which are superposed for joining the bead and the loudspeaker frame, are made of a metal that can be ultrasonically welded to each other. The loudspeaker according to claim 1.