JPH0321117Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" (Field of industrial application) The invention relates to a diaphragm for speakers, which has high rigidity and moderate internal loss, and is particularly resistant to vibration in the circumferential direction. This relates to a strong diaphragm.

(Prior Art) A paper diaphragm is a conventional general speaker diaphragm, but the paper diaphragm generally has a drawback of having low rigidity.

In order to increase the rigidity of the diaphragm, there are those that use carbon fiber or those that are laminated with carbon fiber, but while these provide rigidity, they are difficult to resist vibrations in the tangential direction (circumferential direction of the diaphragm). has the disadvantage of being weak.

(Problems that the invention aims to solve) As mentioned above, conventional diaphragms lack rigidity, and when trying to obtain rigidity, they have problems such as not being able to obtain adequate internal loss, and being weak in the circumferential direction. .

Conventionally, boron fiber has been used as a fiber that can provide sufficient rigidity, and the present invention utilizes boron fiber to provide sufficient rigidity and moderate internal loss, and is particularly resistant to vibrations in the circumferential direction. The object of the present invention is to provide a diaphragm for a speaker. In this case, since there is a limit to the curvature of this boron fiber, for example, boron unidirectional prepreg fiber, in the present invention, the moldability as a diaphragm has been specially devised.

"Structure of the invention" (Means for solving the problems) The speaker diaphragm according to the invention has a band-like structure knitted with dissimilar fibers such as boron fibers and nylon fibers on the surface of a laminated diaphragm base. The bodies are arranged concentrically in a planar or three-dimensional form and are integrally connected.

(Function) As mentioned above, boron-oriented prepreg fibers have a limited curvature and cannot be formed into a small circular shape, but they can be knitted with different types of fibers such as nylon fibers to form a knitted body. The effect of the flexibly movable nylon fibers makes it easy to roll them up and arrange them on the circumference of the diaphragm base. If the knitted bodies are placed on the concentric circumference of the diaphragm base in this way and are integrally joined by heat pressing, etc., the rigidity is extremely high, and since it contains nylon fibers, it has a moderate internal loss. The diaphragm can be made strong against vibrations in the circumferential direction.

(Example) The first example of the speaker diaphragm according to the present invention is
The explanation will be made based on the drawings to FIG. 5. In the drawings, reference numeral 1 indicates the entire speaker diaphragm, and numeral 2 indicates the diaphragm base, which is formed by laminating paper and carbon fiber plain woven material. On the surface of the laminated diaphragm base 2, a band-shaped knitted body 3 made of boron fibers 4 and different types of fibers 5 such as nylon fibers (Tetron fibers or Kevlar fibers may also be used) is arranged concentrically and integrally bonded. has been done. In the example shown in Figures 1 and 3,
Although the knitted body 3 is arranged on the entire surface of the diaphragm base 2, it may be arranged partially as a cone outer circumference reinforcement 6 or a neck reinforcement 7, as shown in FIG. In order to integrally join the diaphragm base 2 and the knitted body 3, in the embodiment, the knitted body 3 is impregnated with epoxy resin and rolled into concentric circles on the diaphragm base 2, and the whole is heated at 130°C for 30 minutes. It was pressed at 10 Kg/cm ² for minutes.

In the examples shown in FIGS. 1 and 3 described above, the knitted body 3 is arranged in a planar manner, but the structure is not limited to this, and may be corrugated reinforcing ribs as shown in FIG. 5.

"Effect of the invention" According to the speaker diaphragm according to the invention, a band-like knitted body made of different types of fibers such as boron fibers and nylon fibers is arranged concentrically and circumferentially on the surface of a laminated diaphragm base. Or, because they are arranged in a three-dimensional form and integrally bonded, boron unidirectional prepreg fibers have a limit in curvature and cannot be formed into a small circular shape, as mentioned above, but this and nylon fibers By knitting the knitted body with different types of fibers such as nylon fibers, it becomes easy to arrange the knitted body in a rounded manner on the circumference of the diaphragm base due to the effect of the flexibly movable nylon fibers. If the knitted bodies are placed on the concentric circumference of the diaphragm base in this way and are integrally joined using a heating press or the like, not only will the rigidity be extremely high, but the elastic modulus in the same direction as the boron fiber will also be extremely high. Moreover, since it contains nylon fibers, etc., it has an appropriate internal loss, and can be made into a diaphragm that is particularly strong against vibrations in the circumferential direction.

[Brief explanation of drawings]

The drawings show an embodiment of the speaker diaphragm according to the present invention, in which Fig. 1 is a sectional view, Fig. 2 is an enlarged plan view of the knitted body, Fig. 3 is a perspective view of the whole, and Fig. 4 is another configuration. FIG. 5 is a perspective view of the entire structure showing an example, and FIG. 5 is a sectional view showing still another example of the structure. 1: entire speaker diaphragm, 2: diaphragm base,
3: Knitted body, 4: Boron fiber, 5: Different type of fiber.

Claims (1)

[Scope of utility model registration request] A diaphragm for a speaker, characterized in that band-shaped knitted bodies made of different types of fibers such as boron fibers and nylon fibers are arranged concentrically and integrally bonded to the surface of a laminated diaphragm base.