JPH0241993Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in a diaphragm support method for improving the frequency characteristics of a dome-shaped speaker.

A conventional dome-shaped speaker has a structure shown in FIG. 1, in which a vibration system consisting of a diaphragm 8 and a voice coil 9 is supported at a predetermined position in a magnetic circuit by an edge 10 provided on the outer periphery of the diaphragm. However, in this configuration, the phase of the sound radiated from the edge and the sound radiated from the diaphragm is different in the high frequency range, and mutual interference causes a large dip in the frequency characteristics. Was.

The present invention is a dome-shaped speaker that eliminates the drawbacks of the conventional example by improving the method of supporting the vibration system. In Figures 2 and 3, 1 is a dome-shaped diaphragm, and 2 is a voice coil. As in the conventional case, it is bonded to the lower surface of the outer periphery of the diaphragm 1 to form a vibration system.

A ring 3 made of an elastic body is provided so as to fill a space surrounded by a ring-shaped magnet 5, a pole 4, an upper plate 6, and a lower plate 7 constituting a magnetic circuit, and the lower end of the voice coil 2 The elastic body ring 3 is fixed in contact with the upper surface to support the vibration system. The material of the elastic ring 3 must have elasticity and strength enough to support the voice coil, and suitable examples include foamed synthetic resin and foamed rubber. Also voice coil 2
and the elastic ring 3 may be fixed by adhesive,
As shown in Fig. 3, an annular cut 31 is made in the elastic ring.
The lower end of the bobbin of the voice coil 2 may be inserted into the cut. As described above, the dome-shaped speaker of the present invention differs from speakers with conventional structures in that the supporting part that vibrates with the diaphragm is not exposed on the front of the speaker, so there is no radiation of sound waves with different phases from the edges, and there is no interference between the sound waves. The negative influence on the frequency characteristics, such as the dip, is eliminated, and the characteristics are improved as shown by the solid line in FIG. The dotted line in FIG. 4 is the characteristic of the conventional product.

As described above, the present invention is a dome-shaped speaker with a structure in which the lower end of the voice coil of the vibration system is supported by an elastic ring provided inside the magnetic circuit. Very useful.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional dome-shaped speaker, FIG. 2 is a sectional view of the dome-shaped speaker of the present invention, FIG. 3 is a sectional view of another embodiment, and FIG. 4 is a frequency characteristic diagram. 1 is a diaphragm, 2 is a voice coil, 3 is an elastic ring, 4 is a pole, 5 is a ring-shaped magnet, 6
is an upper plate, and 7 is a lower plate.

Claims (1)

[Scope of utility model registration request] The space surrounded by the ring-shaped magnet 5, the pole 4, the upper plate 6, and the lower plate 7 is filled with an elastic ring 3, and the lower end of the voice coil 2 of the vibration system consisting of the diaphragm 1 and the voice coil 2 A dome-shaped speaker characterized in that a vibration system is supported by abutting and attaching the elastic ring 3 to the upper surface of the elastic ring 3.