JPS599505Y2 - speaker - Google Patents

Description

[Detailed description of the invention] The present invention relates to a speaker using a circular flat diaphragm with an axisymmetric rotating expanded honeycomb core as a core material, and improves the rigidity of the central part of the axisymmetric honeycomb core to generate primary resonance. The aim is to reduce the diameter of the nodes to enable correct vibration and to stabilize the sound pressure frequency characteristics.

In general, a speaker using a flat diaphragm was constructed as shown in FIG.

That is, a plate 2 having a center pole 1, a ring-shaped magnet 3, and a ring-shaped upper plate 4.
In the magnetic circuit 5 constructed by Combine frame 6,
Along with a gasket 7, an edge 9 bonded to the peripheral edge of a circular flat diaphragm 8 having a honeycomb core as a core material is attached to the peripheral edge of the frame 6 by adhesive or the like. A drive cone 10 is coupled, a voice coil 11 is coupled to the lower part of the drive cone 10, the middle part of the voice coil 11 is held by a damper 12, and the lower part of the voice coil 11 is connected to the magnetic gap 13 of the magnetic circuit 5. He was able to fit into it without becoming eccentric.

In such a speaker, the conventional circular flat plate diaphragm 8
As shown in Figs. 2 and 3, the core material 8a is made by laminating strips of foil with a certain height and rotating them into a honeycomb-like circular flat plate. The structure was constructed by bonding skin materials 8b and 8C to the upper and lower surfaces with an adhesive, but since a hollow portion 8d is created at the center of the core material 8a, when driving the nodes generated by the primary resonance, circular flat plate vibration The central part of the plate 8 has a weak rigidity, does not vibrate as a rigid body, and has the drawback of causing peaks and tapers in the sound pressure frequency characteristics.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Embodiments of the present invention will be described below with reference to FIGS. 4 and 5.

Note that only the circular flat diaphragm is shown here because it has the characteristics of a circular flat diaphragm, but the overall structure of the speaker is the same as that in FIG. 1.

That is, the honeycomb core 8a is formed by partially bonding and laminating strips of foil made of light metal such as aluminum in several places, and rotating and expanding the foils with one end as the center. The hollow portion 8d at the center is filled with an adhesive 14 such as a thermosetting adhesive.

Skin materials 8b, 8 are provided on both upper and lower surfaces of this honeycomb core 8a.
C is pasted with adhesive or the like.

In this case, the adhesive 14 in the hollow portion 8d may be cured in advance, or may be used to adhere to the center of the honeycomb core 8a when the skin materials 8b, 8C are bonded.

Furthermore, a film-like adhesive or a rod-like adhesive may be used as the adhesive 14, and a core material such as metal may be incorporated into the hollow portion 8d together with the adhesive 14 as reinforcement.

As described above, since the speaker of the present invention is structured, the rigidity of the center of the circular flat diaphragm is improved, the amplitude of the center at the first resonance is reduced, and the peak of the sound pressure frequency characteristic is The number of taps and taps is reduced, and flat characteristics can be achieved.

In addition, it has the advantage of increasing the density in the center and reducing the diameter of the nodes that occur in the first-order resonance of free resonance, improving characteristics, and is of great practical value.

[Brief explanation of the drawing]

Figure 1 is a half-sectional view of a typical speaker, Figure 2 is a partially cutaway top view of a circular flat plate vibration used in a conventional speaker, Figure 3 is a cross-sectional view of the same, and Figure 4 is the present invention. A partially cutaway top view of a circular flat plate diaphragm in an embodiment of the speaker;
FIG. 5 is a sectional view of the same. 5... Magnetic circuit, 6... Frame, 8
......Circular flat plate diaphragm, 9...Edge,
10...Drive cone, 11...Voice coil, 13...Magnetic gap, 8a...
... Honeycomb core, 8b, 8C ... Skin material, 8d ... Hollow part, 14 ... Adhesive.

Claims (2)

[Scope of utility model registration request] (1) A circular flat plate diaphragm constructed by pasting skin materials on both upper and lower surfaces of an axially symmetrical rotating expanded honeycomb core is incorporated into the frame connected to the magnetic circuit through the edge, and the magnetic circuit is connected to this circular flat plate diaphragm. A speaker formed by connecting voice coils that fit into a magnetic gap, the speaker being formed by filling an adhesive into a hollow part at the center of the axially symmetrical rotating expanded honeycomb core. (2) The speaker according to claim 1, which is a registered utility model, wherein a core material is contained in an adhesive that is filled into a hollow portion at the center of an axially symmetrical rotationally expanded honeycomb core.