JPS584393Y2 - 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 their specific gravity is higher and vibration loss is less, so they are not as good as paper fibers.

On the other hand, cork sheets have a density of 0.15~ compared to paper fibers.
Although it is small at 0°30g/cm3 and has a large vibration loss,
It also has a low Young's modulus, so it is not as good as paper fiber.

The present invention is a diaphragm structure devised to eliminate the above-mentioned drawbacks, and the embodiment shown in the drawings will be described as follows.
As shown in FIG. 1, a molded body 2 is produced by molding a cork sheet into, for example, a dome shape or a truncated cone shape.

On the other hand, the molded body 1 is manufactured by molding a metal foil such as aluminum, duralumin, titanium, etc. into a dome shape or a truncated cone shape, for example.

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 sectional view of the same, in which a cork sheet molded body 2 is adhered to the surface of a metal foil molded body 1 with an adhesive 3.

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

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

Moreover, by changing the thickness of the metal foil and the thickness of the cork sheet and combining them, it is possible to manufacture many types of diaphragms for the whole range, for medium and high frequencies, and for high sound, making it a device with a wide range of applications.

[Brief explanation of the drawing]

Figure 1 shows the constituent countries of the diaphragm of the present invention, and Figure 2 is a partial cross-sectional view of the diaphragm of the present invention. 1.2 is the molded product, 3 is the adhesive.

Claims (1)

[Scope of utility model registration request] A diaphragm for a loudspeaker that can be formed by pasting a cork sheet on the front, back, or both sides of metal foil with adhesive 3.