JPS623991Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a damper for a speaker, and more specifically, to a damper for a speaker that has excellent followability for large amplitudes.

A damper is used as a suspension for the diaphragm that makes up a speaker, and the most commonly used dampers are corrugations formed in concentric circles, and the damper is made of cloth impregnated with phenolic resin. ing. This damper is required to be able to reliably follow the piston movement of the diaphragm without interfering with it, but there is a limit to how much corrugation can extend when a large input signal is supplied to the voice coil. However, the damper cannot fully follow the movement of the diaphragm, causing local distortion and deteriorating sound quality.

Therefore, this idea is not a damper that follows the piston movement of the diaphragm by expanding and contracting the corrugation, but a damper that can follow the piston movement by expanding and contracting the damper itself, and also allows the diaphragm to be held in the desired posture. To do this, a highly elastic base material is formed into the shape required for the damper, and plastic or metal membrane plates are pasted on both sides of this base material, and slits are made in positions where they do not overlap. It is characterized by having a configuration in which

Hereinafter, the configuration of this invention will be explained with reference to embodiments shown in the attached drawings. First, FIG. 1 is a schematic sectional view of a speaker unit equipped with a damper of this invention, and reference numeral 1 indicates a speaker frame, to which the outer periphery of a cone diaphragm 3 is fixed via an edge 2. Cone diaphragm 3
A voice coil bobbin 4 is fixed to the inner peripheral edge of the voice coil. A driver unit 5 is fixed to the rear end of the speaker frame 1, and the bobbin 4 is located in an air gap 6 of the driver unit 5, and the bobbin 4 makes a piston movement due to the sound current supplied to the voice coil. It is adapted to drive a cone diaphragm 3.

The center axis of the cone diaphragm 3 and the bobbin 4 must coincide with the sound axis, and in order to maintain this posture, the outer periphery of the bobbin 4 is fixed to the speaker frame 1 by a damper 10. has been done.

The damper 10 is constructed by attaching membrane plates 12 as a rigidity imparting material to both sides of an elastic base material 11, such as silicone resin, cut into a predetermined shape as a damper, to give the elastic base material 11 appropriate rigidity. is giving. A metal membrane plate or a relatively rigid plastic membrane plate is used as the membrane plate 12 as the rigidity imparting material, and a plurality of slits 13 are formed concentrically in these membrane plates 12. The slits 13 allow the elastic base material 11 to stretch. The spacing between the slits 13 is determined from factors such as the rigidity of the membrane plate 12, in other words, the thickness and material of the membrane plate 12, and the diameter of the damper.

In addition, the slits 13 of the membrane plate 12 formed on both sides of the elastic base material 11 are not located at the same position on both sides, and there are no slits 13 on one side.
On the other side, circular slits are arranged where the slit 13 is located.

Next, the manufacturing process of the damper according to this invention will be explained. First, membrane plates 12 cut into a predetermined shape are pasted on both sides of an elastic base material 11 cut into a predetermined shape as the damper 10 (FIG. 6). In this case, it is preferable to form a rim 12a on the inner peripheral edge of the upper membrane plate 12, which serves as an attachment margin for the bobbin.

Then, a desired slit 13 is formed in the membrane plate 12 using a cutter K having a shape corresponding to the slit (Fig. 7), but the position of the slit 13 is not aligned on both sides and is shifted by a half pitch. It is arranged in a similar manner.

Moreover, at both the inner and outer peripheral edges, the elastic base material 12 and the membrane plate 1
The edges of the damper 3 are not aligned so that it can be glued alone to the speaker frame or bobbin, increasing the displacement tolerance as a damper.

Since the damper of this invention has the above-mentioned configuration, when it is incorporated into a speaker, the elastic base material 11 stretches in response to the piston movement of the cone diaphragm 3 and the bobbin 4, and the slit 13 portion expands. Moreover, the membrane plates 12, 12 can interfere with each other and resist the rolling motion, acting as a rigid body and preventing the rolling motion.

In the damper of this invention, the compliance increases by widening the width of the slit 13, but the ability to prevent rolling decreases. As the adhesive area with the material 11 becomes larger, the compliance becomes smaller and the rolling prevention ability improves.

In addition, in the above explanation, the slit 1 made on the membrane plate is
Although the slit 13 has a depth that does not reach the elastic base material 11, depending on the material of the elastic base material 11, the depth of the slit 13 may reach the elastic base material 11.

As is clear from the above explanation, the speaker damper of this invention has metal or plastic membrane plates attached to both sides of an elastic base material, and at least a plurality of membrane plates are attached to the membrane plates along concentric circles. Since the slits are arranged so that the slits on both sides do not overlap, the elastic base material stretches against the piston movement of the diaphragm and bobbin.
The slits widen to smoothly allow the movement without hindering it, and the membrane plate acts as a rigid body to prevent rolling movement, and in particular,
Even when a large input is applied, the damper deforms without being partially distorted and does not distort the reproduced sound.
It has a large internal loss and has the effect of suppressing the resonance of the vibration system to a low level.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the speaker damper of this invention, and FIG. 1 is a sectional view of the speaker unit;
Fig. 2 is a partial plan view of the damper, Fig. 3 is an enlarged sectional view along the line shown in Fig. 2, Fig. 4 is an enlarged sectional view showing both the inner and outer edges of the damper, and Fig. 5 is a state in which the damper is extended. 6 and 7 are sectional views corresponding to the manufacturing process.

Claims (1)

[Scope of utility model registration request] comprising membrane plates made of metal or plastic attached to both sides of an elastic base material having a predetermined shape, each membrane plate having regularly formed slits,
A speaker damper characterized in that the slits of each membrane plate are located at positions that do not overlap each other.