FR2465386A1 - MEMBRANE FOR SPEAKER - Google Patents

Abstract

MEMBRANE FOR LOUDSPEAKER, CONSISTING OF A SOUND DIFFUSER MADE OF FIBROUS MATERIAL, PREFERENCE IN CARDBOARD, AND A SURROUND WITH A RIM, IN RUBBER OR SYNTHETIC MATERIAL, THE SURROUND IS CONNECTED TO THE DIFFUSER AND USED FOR FIX OF THE ASSEMBLY IN THE BOX OF THE LOUDSPEAKER, CHARACTERIZED IN THAT, IN TRANSITION ZONE 3 OF DIFFUSER 1 AND OF THE PERIOD TO EDGE 2, IS AN INTIMATE LINK OBTAINED ON THE EDGE OF THE SAID CIRCLE 1 BY A SPRAYING, UNDER HIGH PRESSURE, OF RUBBER OR SYNTHETIC MATERIAL.

Description

Speaker membrane.

  The present invention relates to a membrane for loudspeakers.

speaker, made up of a sound material

  breux, preferably of cardboard, and a periphery provided with a rim, in rubber or synthetic material, said periphery

being connected to the diffuser and used for fixing the assembly

ble in the loudspeaker box.

The connection between the two aforementioned parts, namely the diffuser and the periphery, is usually carried out by bonding, as a result of which the part of said periphery intended to receive

the glue must be made rough. Then the glue is removed

laid carefully and above all uniformly. Independent

  ment of the significant time expenditure required by these operations

rations, there is a particular disadvantage due to

the limitation in the choice that one then has for the consti-

  tution of mixtures from which it is possible to prepare

bore the material of said rim around, since this material must be compatible with the adhesive used. So you can't

  use no material that would interfere with good adhesion and

containing wax, oil, etc., a material which, however, could decisively increase the resistance

aging of said rim around.

An additional disadvantage of the prior art is that in practice there is often an irregular glue deposit, which influences

adversely affects the vibrational properties of the membrane.

The object of the present invention is to eliminate all of these

disadvantages by discarding the bonding solution.

According to the invention, this is obtained in a mem-

brane of the type mentioned at the beginning, characterized in that, in the transition zone of the diffuser and the rim periphery,

  is an intimate bond obtained on the edge of said pour-

  tower by spraying, under high pressure, rubber

cabbage or synthetic material.

  The test results have shown that it is thus possible, by the interpenetration which occurs at the spraying stage, between the plastic substance of said rim around the edges and the ends of the fibers of the sound diffuser, which come slightly protruding from its surface, not only to replace the bonding known from the prior art as regards solidity, but also to surpass it. An exact adaptation of the tool used guarantees an attachment without offset of said sound diffuser, at the same time as a good seal vis-à-vis the mold cavity in which

the rim around it is formed, so that one can thus avoid

  ter an overflow of the material intended to constitute said periphery.

To obtain an optimal connection with the

  sor, it may be advantageous to choose as spray pressure for the substance constituting said periphery

a pressure of approximately 400 to 600 bars.

The single figure of the appended drawing shows, by way of example

  ple in no way limiting, a membrane produced in accordance with

the invention, shown in axial section.

  This membrane has a cardboard sound diffuser 1

  or the like, and a rim 2 with rubber or ma-

  synthetic material. In the transition zone 3 between these two parts of the membrane, an intimate connection is made by spraying rubber or synthetic material under high pressure. As is obvious, and as is moreover already apparent from the foregoing, the invention is in no way limited to those of its modes of application and embodiments which have been more

specially contemplated; on the contrary, it embraces

your variants.

Claims (2)

  1. Speaker membrane, consisting of a sound diffuser made of fibrous material, preferably cardboard, and a   rim provided with a rim, in rubber or synthetic material tick, said periphery being connected to the diffuser and serving to fixing the assembly in the loudspeaker box, characterized in that, in the transition zone (3) of the dif-   fuser (l) and around the rim (2), there is a connection time obtained on the edge of said periphery (l> by a spray sation, under high pressure, of rubber or synthetic material. 2. Membrane according to claim 1, characterized in that the spraying pressure is between approximately 400 and 600 bars.