JPH0112479Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a speaker using a diaphragm made of honeycomb material, and its purpose is to strengthen the strength of the coil bobbin attachment part of the diaphragm and protect the diaphragm from concentrated stress caused by the coil bobbin. It is.

The details of the present invention will be explained below.

FIG. 1 shows a block of honeycomb material. This honeycomb material block 1 is made by laminating a large number of plates or foils 2 made of aluminum, titanium, etc., and adhering adjacent plates or foils 2 at regular intervals.

Figure 2 is an enlarged view of a part of Figure 1.
2, 2', 2''... are aluminum foils with a thickness of 6 to 7 μm, and adjacent aluminum foils 2' and 2 are bonded to each other at t portions with an interval T between them.On the other hand, aluminum foils 2' and the aluminum foil 2'' are bonded to each other at a portion t between the bonded portions of the aluminum foils 2' and 2.

Figure 3 shows the honeycomb material block 1 shown in Figure 1.
A honeycomb material block cut along a-a' is shown. The honeycomb material block shown in FIG. 3 is rotated and expanded in the directions of arrows b and b', centering on one end. Fourth
The figure shows a simplified state during rotational expansion. The rotational expansion is further advanced, and the honeycomb material block is rotated and expanded so that both outermost foils are in contact with each other.
At part l in the figure, both outermost foils are adhered to form a disk-shaped core material.

Figure 5 shows a part of a honeycomb material block rotated and expanded into a disk shape, each foil being adhered to other adjacent foils at regular intervals, and at both ends of the adhesive part of each foil. It is bent to form a large number of hexagonal cells.

FIG. 6 shows a state in which surface materials 4 and 4' made of circular aluminum foil having a thickness of about 20 μm are adhered to both sides of a disk-shaped core material 3 made of honeycomb material.
A film adhesive 5, 5' is interposed between the disc-shaped core material 3 and the surface material 4, 4' made of aluminum foil, and the surface material 4, 4' side is heated to release the film adhesive 5, 5'. The surface materials 4, 4' are pressed onto the disk-shaped core material 3, and the surface materials 4, 4' are adhered to both sides of the disk-shaped core material 3, as shown in FIG. A circular flat plate diaphragm 6 is obtained.

The above speaker diaphragm is lightweight and has high rigidity. For example, if a single plate diaphragm with a diameter of 25 cm is manufactured using 20 g of aluminum foil, its thickness will be
0.8mm, whereas aluminum honeycomb material
When manufacturing a flat diaphragm with a diameter of 25 cm using 20 g, its thickness will be 10 mm, and for the same mass, a diaphragm made of aluminum honeycomb material will have increased rigidity.

In FIG. 7, 7 is a reinforcing material formed in a ring shape on the lower surface of the surface material 4'. Alternatively, it is formed by applying a coating material in a ring shape or plating the ring shape.
The location where this reinforcing material 7 is provided is the nodal circle of the primary resonance mode of the diaphragm 6. A coil bobbin 8 is fixed to the lower surface of the reinforcing member 7, and a voice coil 9 is wound around the coil bobbin 8.

The coil bobbin 8 has an upper end bent, and this bent portion is attached to the reinforcing member 7.

FIG. 8 shows a speaker using the above-mentioned diaphragm. In Figure 8, 10 is the center pole 1
1 is an integrally formed yoke, 12 is a yoke 10
An annular magnet 13 fixed to the upper surface is an annular yoke fixed to the upper surface of the magnet 12, and the inner peripheral surface of the yoke 13 and the center pole 11
An annular magnetic gap is formed between the outer circumferential surface of the A frame plate 14 is supported by the yoke 13. A hole 15 is formed in the frame plate 14, and the diaphragm 6 is inserted into the hole 15. 1
6 is a ring-shaped edge member, the outer peripheral part of this edge member 16 is attached to the frame plate 14,
The inner peripheral portion of the edge member 16 is attached to the diaphragm 6. 17 is a damper. The reinforcing member 7 is in the form of a ring having a width greater than the width of one hexagonal cell of expanded honeycomb material.

In FIG. 8, when a current is passed through the voice coil 9 inserted in the magnetic gap, the voice coil 9
At the same time, the coil bobbin 8 vibrates, and the diaphragm vibrates. Note that the force generated by the voice coil is several Newtons, and a load of several hundred grams per cm ² is applied to the surface material 4' on the lower surface of the diaphragm 6.

In the present invention, since the ring-shaped reinforcing member 7 is provided on the lower surface of the surface material 4', the joint between the coil bobbin 8 and the diaphragm 6 will not be broken. For example, when driving a 160φ coil bobbin directly connected to the surface material (50μ) on the bottom surface of a 30cm diameter diaphragm, the connection between the diaphragm and voice coil will be destroyed in several tens of hours, whereas the surface material If a ring-shaped reinforcing material with a thickness of 50 μm is further provided, the joint between the diaphragm and the coil bobbin will not be destroyed. By setting the width of the ring-shaped reinforcing material 7 to be greater than the width of one cell of the honeycomb material of the diaphragm 6, the nodal circle of the primary resonance mode of the diaphragm 6 is approximately true on the reinforcing material 7. It becomes a circle, and the voice coil bobbin 8 can be securely fixed to the nodal circle.

Furthermore, since the reinforcing material is not incorporated inside the diaphragm and is bonded to the bottom surface of the diaphragm, there is no need to change the structure or shape of the diaphragm. It does not adversely affect the vibration and eigenvalues, and the rigidity does not decrease compared to a diaphragm with a part removed, such as the core or skin being cut out, so it is easy to narrow the playback band. It is.

As described above, according to the present invention, the diaphragm and the coil bobbin can be reliably connected without increasing the mass of the diaphragm, and the reinforcing material is not incorporated inside the diaphragm at all. , because it is glued to the surface of one side of the diaphragm.
Since there is no need to change the structure or shape of the diaphragm, there is no negative effect on the vibration mode or eigenvalue of the diaphragm, and compared to a diaphragm in which the inside of the diaphragm is removed, the present invention Since the diaphragm itself remains in perfect shape with no missing parts, it is possible to narrow the reproduction band without reducing rigidity.

Furthermore, by forming the width of the ring-shaped reinforcing material to be greater than the width of one hexagonal cell of the honeycomb material, the nodal circle of the primary resonance mode of the diaphragm becomes almost a perfect circle on the reinforcing material. , the coil bobbin can be reliably connected to the nodal portion thereof, and the connection between the diaphragm and the coil bobbin can be prevented from being broken, which has a great effect.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a honeycomb block, Fig. 2 is an enlarged top view of the same part, Fig. 3 is a partially cutaway perspective view of the honeycomb block, and Fig. 4 is a view of the honeycomb block being rotated and expanded. A top view showing the state, FIG. 6 is an enlarged top view of a part of the rotationally expanded honeycomb material, FIG. 6 is a side view of the process of bonding the surface material to the core material which is the rotationally expanded honeycomb material, and FIG. FIG. 8 is a side sectional view of a speaker according to an embodiment of the present invention, and FIG. 8 is a partially cutaway perspective view of a speaker according to an embodiment of the present invention. 1...Honeycomb block, 2, 2', 2''...
Foil, 3... Core material, 4, 4'... Surface material, 5, 5'...
...Film adhesive, 6...Diaphragm, 7...Reinforcing material, 8...Coil bobbin, 9...Voice coil.

Claims (1)

[Scope of utility model registration request] A diaphragm is constructed by adhering a surface material to the surface of the rotationally expanded honeycomb material, and the width of one hexagonal cell of the rotationally expanded honeycomb material or more is attached to the surface of the nodal part on one side of the diaphragm. A speaker made by bonding one side of a ring-shaped reinforcing material with a predetermined thickness and a width of , and joining the bent end of a coil bobbin to the other side of this reinforcing material.