JPS6327519Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a speaker diaphragm.
In particular, it is an object of the present invention to provide a speaker diaphragm that is easy to manufacture and has excellent characteristics.

Conventionally, speaker diaphragms are often made of paper. This kind of paper speaker diaphragm has the advantage of having stable characteristics because it has been used for many years, and the manufacturing technology has been established. In order to manufacture a high-quality diaphragm, a great deal of labor and experience was required, and special edges had to be attached. Furthermore, speaker diaphragms made by vacuum forming synthetic resin films or sheets instead of paper have also been proposed because they are easier to manufacture. This is as shown in Fig. 1 A and B, and by vacuum forming a synthetic resin sheet or film, a hemispherical vibrating part 1 and an edge part 2 surrounding the vibrating part 1 in a donut shape are formed. It is molded in one piece. This kind of synthetic resin speaker diaphragm can be easily manufactured.
Although it has the advantage of being suitable for mass production, since the dimensions and curvature from the center to the outer periphery are uniform, the entire area produces the same resonance, resulting in large peaks and dips in the mid-range of the playback band. It was not a desirable result. Therefore, conventional speaker diaphragms made of synthetic resin can only be used as diaphragms for small diameters and limited bands, such as tweeter diaphragms.

The present invention has been developed in view of the above points, and will be described below based on embodiments with reference to the drawings. FIG. 2 shows an embodiment of the present invention, which is a speaker vibrating device consisting of a circular and hemispherical central vibrating section 3, and an auxiliary vibrating section 4 that is integral with the central vibrating section 3 and has a rectangular peripheral edge. A plate 5 and a rectangular frame 6 to which the speaker diaphragm 5 is attached are shown.
FIG. 3 is a cross-sectional view to more clearly show the shape of the speaker diaphragm 5 shown in FIG. 2, and to show an example of when it is incorporated into a speaker.
It comprises a hemispherical central vibrating part 3 and an auxiliary vibrating part 4 having an arcuate cross section and a peripheral edge fixed to the frame 6, and on the back side of the intersection of the central vibrating part 3 and the auxiliary vibrating part 4, A bobbin 8 around which a voice coil 7 is wound is connected. Therefore, the magnetic circuit 9
The voice coil 7 is driven by this action, and the vibrating section 5 vibrates.

The speaker diaphragm according to the present invention is formed by vacuum forming a Mylar film or a polypropylene sheet using a predetermined mold. When the heated Mylar film or polypropylene sheet is placed on a mold and vacuum formed, the mold absorbs the heat and cools it down to a predetermined shape. Then, the frame and bobbin are connected to a speaker diaphragm having a predetermined shape, and the voice coil is placed at a predetermined position in the magnetic circuit to complete the speaker.

Therefore, the present invention has the advantage that a diaphragm having a predetermined shape can be easily produced.

Furthermore, in the speaker diaphragm according to the present invention, the central vibrating section 3 is circular and the auxiliary vibrating section 4 is square. , or the curvature of the auxiliary vibration section 4 differs depending on the location. For that reason,
This has the advantage that it is possible to prevent the divided vibrations from concentrating on a specific frequency, and that a flat frequency characteristic can be obtained as a whole.

Furthermore, according to the present invention, both the central vibration section and the auxiliary vibration section can be regarded as diaphragms, so that a rectangular diaphragm is placed on the front surface of the speaker box, which has a rectangular parallelepiped shape.
The ratio of the diaphragm to the area of the front of the speaker box can be increased, which is equivalent to using a large-diameter circular diaphragm, and has the advantage of being able to expand the range of low-frequency reproduction.

As described above, the speaker diaphragm according to the present invention is a practical one that can be easily manufactured and has improved acoustic characteristics.

[Brief explanation of the drawing]

Fig. 1A is a sectional view showing a conventional synthetic resin diaphragm, B is a plan view thereof, Fig. 2 is a perspective view showing an embodiment of the present invention, and Fig. 3 is a speaker vibration according to the present invention. FIG. 2 is a partial cross-sectional view showing a speaker using a plate. Explanation of main drawing numbers, 3... Central vibrating section, 4... Auxiliary vibrating section, 5 ... Vibrating plate.

Claims (1)

[Scope of utility model registration request] A speaker diaphragm comprising a central vibrating part and an auxiliary vibrating part connected to the periphery of the central vibrating part and having a peripheral edge attached and fixed to a frame, the central vibrating part and the auxiliary vibrating part being combined. 1. A speaker diaphragm characterized in that the central vibrating section is integrally molded from a resin material, and the central vibrating section is formed in a circular hemispherical shape, and the auxiliary vibrating section is formed in a square shape with an arcuate cross section.