JPS6115676Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of the diaphragm of a speaker.

Characteristics required for a speaker diaphragm include a large specific elastic modulus E/ρ (E: elastic modulus, ρ: density) and a moderate internal loss. Recently, honeycomb structured diaphragms have been used to satisfy these requirements. This one is the first
As shown in Fig. 2, a thin aluminum plate is used as the core material 6 of the honeycomb, and both sides of the aluminum plate are
A diaphragm made from wood cellulose fibers, with a three-layer cross-section made by pasting skin materials 10 and 11 made of thin plates such as CFRP (carbon fiber reinforced plastics). An excellent diaphragm can be obtained in which the specific elastic modulus E/ρ is 5 to 10 times that of the conventional diaphragm, and the internal loss is almost the same. However, the core material 6 of this honeycomb structure diaphragm
In manufacturing, a large number of thin strips with a width in the thickness direction of the diaphragm are overlapped and partially glued in a staggered manner, and then stretched to form a honeycomb shape as shown in Figure 1. It is cut by punching into the shape of a speaker's diaphragm, for example, a circular donut shape. For this reason, at the inner peripheral end where the voice coil 9 is attached, as shown in the drawing, the end face of the thin plate of the core material 6 comes into contact with the plane of the skin materials 10, 11 and the voice coil 9, resulting in a small bonding area and causing poor adhesion. There were flaws. Furthermore, even if a material with good thermal conductivity such as aluminum is used for the core material 6, the contact area with the voice coil is small, and the heat of the voice coil cannot be dissipated, causing the adhesive to deteriorate due to the rise in voice coil temperature. It had the disadvantage of damaging the

This invention aims to improve these drawbacks and provide a speaker diaphragm that can provide a speaker with little temperature rise even under large inputs.

An embodiment of this invention will be described below with reference to the drawings.

In FIGS. 3 to 5, 1 is a pole piece of a speaker, 2 is a magnet placed and fixed on the flange of this pole piece, and 3 is a magnet whose inner peripheral end forms a predetermined gap with the pole piece. This is a plate placed and fixed on 2. The pole piece 1, magnet 2, and plate 3 constitute a magnetic circuit of the speaker. 4 is a frame attached to the above plate, 5 is a speaker diaphragm,
Reference numeral 6 denotes the core material of this diaphragm, which is made of a thin plate or foil made of a material with high thermal conductivity such as aluminum or aluminum alloy, and has a certain height from the bottom surface 14 as shown in FIGS. The portion 15 is provided with a large number of planar protrusions 7, and the inner peripheral end to which the voice coil 9 is attached is provided with a bent portion 8 formed in the same shape as the voice coil bobbin. As shown in FIG. 5, this bent portion extends beyond the thickness of the diaphragm, and a nine-wire voice coil is electrically insulated and wound around the extended portion. 10,1
1 is a skin material affixed with adhesive to the flat end and bottom surface of the projection 7 of the core material 6, and is made of CFRP (carbon fiber reinforced plastics) or GFRP.
It is made of sheet-like materials such as glass fiber reinforced plastics. In this way, the diaphragm 5 of the speaker has a core material 6, skin materials 10 and 11.
It consists of Reference numerals 12 and 13 denote edges and spiders for holding the diaphragm of the speaker at a proper position in the magnetic circuit.

Next, the assembly and operation of the diaphragm of the speaker configured as described above will be explained.

First, when manufacturing the diaphragm, the core material 6 is formed by molding the protruding portions 7 and the bent portions 8 using a method such as pressing. In this way, it can be easily manufactured from a flat plate using normal operations. Next, the skin materials 10 and 11 are pasted with adhesive, but the contact between the skin material and the core material is at the bottom surface 14 and the tip portion 15, and the contact area is compared to the conventional contact between the flat surface and the end surface of the core. The amount can be increased by several tens to hundreds of times, and the adhesion can be performed reliably. Furthermore, the voice coil 9 wire is wound around the bent portion 8 of the core material 6 thus formed, and the assembly is completed.

Next, when the diaphragm and voice coil constructed in this way are assembled into a speaker and operated, an input is received to the voice coil 9 and the diaphragm 5 vibrates, but when a large input is received, the voice coil 9 generates heat and its temperature increases. However, in this invention, the voice coil 9 and the core material 6 of the diaphragm 5 are integrally formed, and the core material 6 is made of aluminum with high thermal conductivity. , or because aluminum alloy is used, the heat generated in the voice coil 9 is transferred to the core material 6 with a large surface area and dissipated, suppressing the temperature rise in the voice coil part, and even at high inputs, the adhesive This makes it possible to create a speaker without any deterioration.

As mentioned above, the diaphragm of the speaker with the three-layer structure of this invention is made by extending the bent part of the core material made of a material with high thermal conductivity, and the voice coil and the diaphragm are also used as the bobbin of the voice coil. In addition, since the core material and skin material are bonded together through surface contact over a large area, there is no possibility of adhesion failure, and the heat dissipation of the voice coil is effectively performed, so even with large inputs, there is no risk of temperature rise. The speaker diaphragm can be made without damage.

[Brief explanation of the drawing]

Figures 1 and 2 show a part of a conventional diaphragm,
FIG. 1 is a plan view, and FIG. 2 is a cross-sectional view.
Figures 3 to 5 show examples of this invention;
The figure is a vertical sectional view of a speaker using the diaphragm of this invention, Figure 4 is a plan view, and Figure 5 is a cross-sectional view.
It is. In the figure, 5 is a diaphragm, 6 is a core material, 7 is a protrusion, 8 is a bent part, 9 is a voice coil, 1
0 and 11 are skin materials, 14 is a bottom surface, and 15 is a tip. The same reference numerals in the figures represent the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a speaker diaphragm that has a core material and a skin material bonded to both sides of the core material to form a three-layer structure, which is formed into an annular shape and a voice coil is attached to the inner periphery, the core material has a high thermal conductivity. A thin plate made of a material with a high thickness is used, and a large number of protrusions having a desired height are formed on one side of this thin plate, and at least the thickness of a diaphragm having approximately the same shape as the voice coil is formed on the inner peripheral end where the voice coil is attached. It is characterized by having a core material with a bent part for winding the voice coil wire, and adhesively fixing the tip of the protruding part of this core material and the bottom surface with a skin material. The diaphragm of the speaker.