JPS62247699A - Support member for diaphragm of electroacoustic transducer - Google Patents

Abstract

PURPOSE:To improve linearity and to reduce the difference of reciprocating displacements by using polyester amide elastomer to the member which supports elastically the diaphragm for an electroacoustic transducer. CONSTITUTION:A sheet of about 0.3mm is obtained by extrusion molding from polyester amide elastomer having a structural formula (p = 5 or 11; n, m: integers) as shown. Then the sheet is formed by vaccume molding into an edge of such a shape as shown in the figure. This edge is combined with a magnetic circuit for production of a speaker. In such a constitution, the speaker having the improved linearity, the reduced difference of reciprocating replacements and high frequency characteristics can be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to improvements in support members such as edges and dampers for elastically supporting a diaphragm for an electroacoustic transducer.

[Prior Art] This type of support member, for example, an edge for a speaker diaphragm, is explained by impregnating a cotton cloth or the like with a thermosetting resin, coating it with a viscoelastic material such as rubber, and then forming a predetermined edge. The following were frequently used: coated cloth edge that was heat-formed into a shape, and (2) foamed urethane edge that was heat-formed from a foamed urethane sheet into a predetermined edge shape.

[Problems to be Solved by the Invention] However, the above-mentioned conventional edges have various unsatisfactory points. For example, in case (■), the linearity of input-displacement characteristics is not good because the material itself lacks elasticity. Also, due to the increase in weight due to the coating Hfa and the coating layer, the amount of viscoelastic material coated has to be substantially reduced, so the loss is not sufficient, and the damping effect of high frequency resonance is poor, resulting in flat frequency characteristics. It has the problem of being difficult to obtain.

In addition, although the edge (■) has better elasticity than the edge (2), it has the same problem as the edge (2) because the internal loss is not sufficient, and it also has poor light resistance and significant deterioration of physical properties due to light. Ta.

[Means for Solving the Problems] According to the present invention, a supporting member of a diaphragm for an electroacoustic transducer is made of polyesteramide elastomer.

[Effects] The diaphragm can be ideally supported due to the above-mentioned support member's good elasticity, sufficient internal loss, good light resistance and heat resistance, good frequency characteristics, and aging. We were able to provide an electroacoustic transducer with little change.

[Example] Hereinafter, this invention will be explained with reference to examples.

The chemical structure is (-(CO-NH-(CH2±-■C0(CH2+rO
COofO→CH2+t÷p-5 or 11, m, n
: A polyesteramide elastomer indicated by an integer was formed into a sheet having a thickness of 0.3 mm by extrusion molding, and the sheet was further vacuum formed into an edge having the shape shown in FIG.

Then, the edge is combined with a magnetic circuit, etc., and the speaker 1
was produced.

On the other hand, as a comparative example, a speaker 2.3 was obtained by combining a coated cloth edge and a foamed urethane edge (8 shoes thick) having the shapes shown in FIG. 1 with the same magnetic circuit.

[Effects of the Invention] The input-displacement characteristics and frequency characteristics of the speaker 1 of the present invention and the comparative speaker 2.3 are shown in FIGS. 2a and 2.
FIG. 4 shows the light resistance (measured by a carbon weather meter) of the edge of this invention example and the foamed urethane edge.

As can be seen from FIGS. 2a and 2b, this embodiment of the invention has the advantage of extremely good linearity and extremely small difference in reciprocating displacement of the diaphragm, that is, hysteresis.

Also, as can be seen from FIG. 3, according to the embodiment of the present invention, the peak of high frequency resonance is relaxed and a flatter frequency characteristic is achieved.

This shows that the edge braking action of this embodiment of the invention is good.

Further, as can be seen from FIG. 4, according to the embodiment of the present invention, the deterioration of physical properties due to light irradiation is extremely small and the light resistance is improved, and this has advantages not found in the prior art, such as less deterioration of characteristics due to aging.

Furthermore, it has been found that the embodiments of the present invention have the advantage that the Young's modulus of the edge hardly changes in the temperature range of 10° C. to 70° C., and the change in characteristics due to temperature can be almost ignored.

[Brief explanation of drawings]

FIG. 1 is a shape diagram of the edge of the embodiment, and FIG. 2a is a diagram of input-displacement characteristics of a speaker using the edge of the embodiment of the present invention.
Fig. 2b is an input-displacement characteristic diagram of a speaker using a conventional edge, Fig. 3 is a frequency characteristic diagram of a speaker using an edge of the present invention and a conventional example, and Fig. 4 is a light resistance diagram of an edge of an embodiment of the present invention. This is a characteristic diagram showing the characteristics. Patent applicant Onkyo Corporation - F! ? ! Goods β January (H)

Claims (1)

[Claims] A support member for elastically supporting a diaphragm for an electroacoustic transducer, characterized in that the support member is made of polyesteramide elastomer.