JPS6033038B2 - Loudspeaker diaphragm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for a loudspeaker in which a mesh molded product is bonded to the diaphragm.

Conventionally, the Young's modulus of a diaphragm for a loudspeaker is almost uniform from a portion near the top of the head conical shape to a peripheral portion.

However, the ideal diaphragm has a structure in which the Young's modulus is high near the top, and the Young's modulus gradually decreases toward the periphery.

That is, when viewed from the frequency characteristics, the reproduced frequency range becomes wider and the intermediate frequency characteristics become flat. In order to widen the playback frequency range, two or more large and small cones are coaxially arranged, or the same CI is stacked on top of each other in a wet state and heated and pressurized to form an integral structure. In addition, as a method for flattening the frequency characteristics, a patent application was published in 1971-1210? In a method of manufacturing a speaker diaphragm using nonwoven fabric, there is a method of eliminating the gap in the characteristic curve of the midrange sound by designing the diaphragm to have a large vibration loss around the periphery of the diaphragm. However, all of these methods have the disadvantage of increasing the weight of the finished paper cone or otherwise reducing the piston vibration area. The present invention is a loudspeaker diaphragm that eliminates the above drawbacks and further improves frequency characteristics. To explain this in an example shown in the drawings, as shown in Fig. 1, a cylindrical piece of silk knitted with highly elastic fibers such as glass, carbon, polyester, aromatic nylon, or wires of light metal is used. As shown in Fig. 2, a molded mesh 1 is made in which one end is widened to form a conical shape, and the mesh is dense in the center and sparse in the expanded periphery. Apply poval or other suitable adhesive to a cone-shaped diaphragm 2 that has been cut and molded in the usual manner, and as shown in Figure 3, apply molded silk 1 to one or both sides, press dry, and stick together. Since the diaphragm made in this way has a dense mesh of highly elastic material near the top, the Young's modulus is high, extending the high-pitched sound range of the speaker, and significantly reducing the sound pressure in the high-pitched range. improves. The forming net 1 continuously spreads in the generatrix direction from the area near the top to the peripheral area, and gradually becomes sparser from the dense mesh of the forming net 1, so the average Young's modulus is greater than the area near the top. It changes continuously and gradually becomes lower as it reaches the peripheral area. In the outermost peripheral area, the wire or fiber net is the sparsest, and only the part where the net is attached to the diaphragm 2 is press-dried.
Most of the other parts are not press-dried by the forming net 1, and therefore the Young's modulus is maintained at the lowest. In other words, from the part near the top to the peripheral part,
It will have mesh-like ribs, and the molded mesh 1
Since the wires or fibers are oriented in the generatrix direction of the diaphragm 2, the stiffness of the diaphragm in the vibration direction is improved and the Young's modulus of the diaphragm as a whole is increased. For this reason, if the same stiffness as the subordinate diaphragm can be maintained, the average thickness of the diaphragm 2 can be reduced, and the weight of the diaphragm can be reduced. In addition, the thickness of the wire or fiber of the forming net 1,
By changing the number, various Young's modulus and thickness distributions can be obtained, and the properties of the diaphragm can be changed in various ways. As described above, in the present invention, a molded mesh 1 is pasted on one or both sides of the vice principal's conical fibrous diaphragm 2, which has a dense mesh in the central part of the cone and a sparse mesh in the peripheral part. By using the simple method of press drying, the area near the top has the highest Young's modulus, and the Young's modulus is continuously changed from the area near the top to the peripheral area, and the Young's modulus is the highest in the peripheral area. Since the reproduction frequency characteristic of the speaker is kept low, the reproduction of the high frequency range is extended, and the frequency of the low frequency range is kept sufficiently low, so the reproduction frequency range is wide, and a flat loudspeaker diaphragm from the low frequency range to the high frequency range can be obtained. It is something that can be done.

[Brief explanation of drawings]

Fig. 1 is a forming diagram of the forming net 1, Fig. 2 is a view with one end of the forming net 1 expanded, and Fig. 3 is the diaphragm of the present invention, 1 is the forming net, and 2 is the diaphragm. Evening/Shu Roku 2, Fire 3

Claims (1)

[Claims] 1 One end of a cylindrical mesh woven from high-elastic fibers or wires is enlarged, the center part is densely formed, and the peripheral part is sparsely formed, and then attached to one or both sides of a truncated conical diaphragm. Diaphragm for fibrous loudspeakers.