SU35704A1 - Loudspeaker membrane - Google Patents

Description

The invention relates to a device of a membrane provided with elastic edges at the edges and reinforced with pads in the middle part. In such a membrane, a gear rim is used, which is laid between the meek and its support, the teeth of which support the membrane alternately from the outside and inside.

In FIG. 1 shows a view of a part of the membrane; FIG. 2 is also a rear view; FIG. 3 is a view of a portion of the membrane in another form of embodiment; and FIG. 4-part of her.

A conical membrane 1 (Figs. 1 and 2), made of light, rigid paper, is reinforced at the apex of the cone with two layers of paper superimposed on each other, with one layer 7 positioned at. the top of the coius and the other 8 are in the form of a tape forming a truncated cone. The angle of coius ranges from 90 ° to 110 °. On the periphery-coius there is a strip of loose material (felt) 4, put on the edge and held by gluing. A hem trimmed in this way is inserted between the teeth 3, 3, etc., cut in a rigid rim 5; and the teeth are consistently slightly

(568)

divorced on both sides of the original conical surface, with the same angle at the top as the paper cone. The crown 5 is fixed on the membrane support 6 by means of the screw 9. The support 6 can be of any known type, for example, a wooden shield, or a box, is closed or not closed on its back side and its material can be any (cardboard, fiber, ebonite, metal etc.).

The modified membrane 1 (Fig. 3) is provided on its periphery with a cylindrical part or flange 2, which can be attached to the membrane by gluing or directly deforming the membrane-forming cone. The teeth 3 presses the inner surface of the cylindrical flange 2. The teeth 3 are located in different places along the periphery of the membrane and can be more or less numerous; they can also be made from the same metal sheet, appropriately cut. FIG. 4 depicts a portion of a metal crown 5.