JPS584394Y2 - Loudspeaker diaphragm - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to the structure of a diaphragm for a loudspeaker.

Conventionally, paper fiber diaphragms have been generally used as materials with high internal loss and high Young's modulus for loudspeaker diaphragms, but in order to increase the internal loss required for loudspeaker diaphragms, vibration The Young's modulus of the board itself decreases, resulting in insufficient high-frequency extension of the loudspeaker's frequency characteristics.

As diaphragm materials, light metals such as aluminum, duralumin, and titanium have a higher Young's modulus than paper fibers, but they have higher specific gravity and less vibration loss, so they are not as good as paper fibers.

On the other hand, cork has a density of 0.15 to 0.3 compared to paper fiber.
Although it is small at 0g/cm3 and has a large vibration loss,
It also has a low Young's modulus, so it is not as good as paper fiber.

This invention was devised to eliminate the above drawbacks.
To explain this in an embodiment shown in the drawings, as shown in FIG. Then, the molded product 1 is manufactured by heating and curing it in a heating mold and molding it into, for example, a dome shape or a truncated cone shape.

On the other hand, the molded body 2 is manufactured by molding a metal foil such as aluminum, duralumin, titanium, or the like into, for example, a dome shape or a truncated cone shape.

A diaphragm for a loudspeaker is made by concentrically adhering a molded body 2 to the front, back, or both sides of a molded body 1 with an adhesive 3 such as synthetic rubber.

FIG. 2 is a partial cross-sectional view of the same, in which cork particles 4 and thermosetting resin 5 are mixed to form a molded ELL, and a metal foil molded product 2 is adhered to the surface of the ELL using an adhesive 3. .

The diaphragm manufactured in this way combines the high Young's modulus of metal foil with the low specific gravity and large vibration loss of cork, and has high rigidity and light weight. Harmful vibrations are absorbed, and a diaphragm with good frequency characteristics over a wide band can be obtained.

As described above, the present invention achieves a high quality product with high internal loss and high Young's modulus, which was unprecedented by pasting the cork molded body 1 and the metal foil molded body 2 with adhesive 3. A diaphragm for a loudspeaker has been obtained, and compared to the frequency characteristics of a paper fiber diaphragm, the treble range is extended, there are fewer peaks and valleys in the high range, and the frequency characteristics are almost flat over a wide range. This dramatically improves the playback quality.

Furthermore, by changing the thickness of the metal foil and the thickness of the cork molded body 1 and combining them, it is possible to produce many types of diaphragms for the whole range, for medium and high frequencies, for high sound, etc., making it a device with a wide range of applications. be.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of the diaphragm of the present invention, and FIG. 2 is a partial sectional view of the diaphragm of the present invention. 1.2 is a molded product, 3 is an adhesive, 4 is a cork particle, and 5 is a thermosetting resin.

Claims (1)

[Scope of utility model registration request] A diaphragm for a loudspeaker, which is formed by adhering metal foil to the front surface, back surface, or both surfaces of a molded layer made by mixing cork particles 4 and a thermosetting resin 5 and heating and curing the mixture, using an adhesive 3.