JPH0619277Y2 - Peripheral support for electroacoustic transducer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a peripheral support for an electroacoustic transducer such as a speaker.

[Prior Art] An electroacoustic transducer, for example, a peripheral support (a so-called edge) of a speaker has a function of peripheral support of a diaphragm and vibration damping, and has a structure integrally formed with the diaphragm, or Although there is a structure formed separately from the diaphragm, the latter so-called free edge has the following structure.

It has a structure in which an acrylic base emulsion made of a woven fabric of natural fibers or synthetic fibers is coated and impregnated with an acrylic resin emulsion, dried and then molded into a predetermined shape.

[Problems to be Solved by the Invention] The above acrylic resin emulsion has 4
Since only about 0 to 70% by weight can be applied and impregnated, flexibility and vibration loss are insufficient, peaks and dips occur in the sound pressure frequency characteristics of the speaker, and the distortion characteristics are not sufficient. Since the properties are constant and it is difficult to set it arbitrarily, it is necessary to consider multiple types of base fabrics in terms of their materials, etc. Temperature about 10
5 ° C.), large expansion and contraction deformation due to heat, deterioration in 1000 hours of Sunshine weather test, and deterioration in weather resistance such as embrittlement.

[Means for Solving the Problems] The peripheral support of the present invention is a peripheral support treatment agent in which an ester resin and an acrylic resin are mixed and prepared in a base cloth to prepare a resin solution, and an isocyanate is added to the resin solution. Is impregnated, the ester resin and the isocyanate are reacted and cured, and then molded into a predetermined shape.

[Function] The peripheral support treatment agent impregnated into the base cloth is the -OH group, -COOH group of the ester resin and the isocyanate (RNCO).
And And react to produce a reaction cured product.

[Embodiment] A representative embodiment of the present invention will be described with reference to FIGS. 1 and 2.

First, a peripheral support treatment agent is prepared as follows.

75 parts by weight of ester resin and 25 parts by weight of acrylic resin were mixed and prepared to form a 35% resin solution, 5 parts by weight of isocyanate was added to this resin solution, and then diluted to a constant concentration with a solvent (toluene), Used as a peripheral support treatment agent.

Then, while the rolled-up base material 1 is being fed out, the peripheral support treating agent 2 is applied and impregnated onto the base material 1 by a doctor knife method. Then, the base cloth 1 is forcedly dried by passing through a dryer 3 in which hot air is jetted, to obtain a base material 4. A reaction-cured product 2a of the peripheral support treatment agent 2 is formed inside and on the surface of the base material 4.

This is because of forced drying, the -OH group of the ester resin,
This is because the -COOH group is reacted with the isocyanate (RNCO) to form a reaction cured product.

After that, the base material 4 is heated and pressed by a known means to be molded into a predetermined shape to form the peripheral support 5.

[Effects of the Invention] Since the ester resin of the peripheral support treating agent impregnated in the base cloth and the isocyanate are reacted and cured to form a reaction-cured product, all the problems to be solved by the conventional techniques described above are solved. Not only that, increasing the amount of ester resin increases the flexibility of the peripheral support, and decreasing the amount of ester resin decreases the flexibility of the peripheral support. Since it is possible to realize arbitrary flexibility and vibration loss, peaks and depths of sound pressure frequency characteristics as an electroacoustic transducer, for example, a speaker are suppressed, and distortion characteristics are also significantly improved. Wider design range according to design specifications, improved heat resistance, less expansion and contraction due to heat,
Since the reaction cured product is a polymer, the water resistance is also improved,
Adhesion between the peripheral support and the frame that supports the peripheral support has the effect of enabling the specification of a solventless emulsion.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of a peripheral support for an electroacoustic transducer and a manufacturing process thereof according to the present invention, and FIG. 2 is a diagram showing a structure of the peripheral support. 1 ... Base cloth, 2 ... Treatment agent, 2a ... Reaction cured product, 3 ...
… Dryer, 4 …… Base material, 5 …… For peripheral support.

Claims (1)

[Scope of utility model registration request] 1. A base cloth is prepared by mixing and preparing an ester resin and an acrylic resin into a resin solution, and the resin solution is impregnated with a peripheral support treatment agent to which an isocyanate has been added to obtain the ester resin and the isocyanate. A peripheral support for an electroacoustic transducer, which is formed into a predetermined shape after being reaction-cured.