JPS5847399A - Speaker - Google Patents

Abstract

PURPOSE:To control a low-frequency buzz of a diaphragm, to radiate heat generated by a coil, and to improve resistance to input, by sticking a thin metallic plate, which has numbers of small perforations, to the side of the diaphragm where a printed voice coil is not formed. CONSTITUTION:A thin metallic plate 12 is stuck to the entire top surface of a diaphragm 9 where a printed voice coil 8 is not formed, and the diaphragm 9 is coupled with a fixed plate 7 through the thin metallic plate 12; and then this is stuck on the top surface of a magnetic circuit 5 through a baffle plate 11 and a radiating fin 10. As a result, the oscillation part of the diaphragm 9 is divided into numbers of fine parts as large as small holes 13 of the thin metallic plate 12, so the thin diaphragm 9 has preper strength with several mm.<2> area; low- frequency playback becomes hard, but a buzz and distortion in a low frequency range are controlled. Further, the radiation of the printed voice coil 8 is performed effectively, so resistance to input is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker using a diaphragm having a printed voice coil formed thereon.

Generally, a speaker using a diaphragm having a printed voice coil was constructed as shown in FIG.

That is, a rectangular parallelepiped magnet 2 is arranged on both sides of a rectangular parallelepiped center pole 10 so as to form a step at the top, and a yoke 3 bent toward the center pole 1 is arranged at the upper part of the outer surface of the magnet 2. , a magnetic gap 4 is formed between the upper part of the center pole 1 and the upper part of the yoke 3 to constitute a magnetic circuit 6, and a fixed plate having a long hole 6 corresponding to the magnetic gap 4 on the upper surface of the magnetic circuit 5. 10 having a printed voice 2 coil 8 formed by printing on the lower surface of 7 at a position corresponding to the magnetic gap 4;
It was constructed by attaching a baffle plate 11 on a yoke 3.

A speaker with this structure has the great feature of being able to reproduce even ultra-high frequencies, but as shown in Figure 2, the conventional diaphragm 9 is very thin, so abnormal vibrations can occur in the low frequencies. The problem was that it had a lot of vibration, had to be used for ultra-high frequencies, and was difficult to use in 2-way or 3-way systems.

In addition, the vibrating membrane 9 is not inside the magnetic circuit 6,
Further, since the magnetic gap 4 is quite wide, heat dissipation is poor, and when a large input is applied, the heat generated by the printed voice coil 8 causes the vibrating membrane 9 to burn out.

The present invention eliminates the above-mentioned conventional drawbacks, and aims to improve the input resistance by damping the vibration membrane's vibration in the low range and efficiently dissipating the heat generated by the printed voice coil. This is the purpose.

In order to achieve the above object of the present invention, the present invention has a configuration in which a thin metal plate with a large number of small holes is attached to the side of the diaphragm on which the printed voice coil is not formed.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 7.

Since the basic structure of the speaker is the same as that shown in FIG. 1, the structure of the diaphragm portion will be explained here.

FIG. 3 shows a fixing plate 7 made of metal, which is placed on the upper surface of the magnetic circuit 6, and has elongated holes 6 formed at positions corresponding to the magnetic gaps 4 of the magnetic circuit 6.

Figure 4 shows the thickness, which is a feature of the present invention. , 05~o, 3
This thin metal plate 12 is made of stainless steel or aluminum and has an aperture ratio of 80 mm by etching.
-g□%, a large number of small holes 13 as shown in FIG. 5 are formed. This small hole 13 may be hexagonal as shown in FIG. 6, or may be a circular hole or a square hole.

FIG. 6 shows a vibrating membrane 9 made of polyimide resin film.
A spiral printed voice coil 8 is formed at a position corresponding to the magnetic gap 4 of the magnetic circuit 5. The vibrating membrane 9 is formed by etching a printed voice coil 8 using a laminate of aluminum foil and polyimide resin film.

A thin metal plate 12 is attached to the upper surface of the diaphragm 9, that is, the entire surface where the printed voice coil 8 is not formed, and the diaphragm 9 is coupled to the fixed plate 7 via the thin metal plate 12. baffle plate 11. Heat radiation fin 1
It is fixed by o.

With such a configuration, the portion of the vibrating membrane 9' that is photographed is divided into a large number of minute parts of the size of the small holes 13 of the thin metal plate 12, so that the thin vibrating membrane 9 can also be divided into several minute areas. has moderate strength, and although it becomes difficult to reproduce low frequencies, it is effective in damping distortion and distortion in low frequencies.

Furthermore, even if the printed voice coil 8 generates heat due to the application of a large input, this heat is transferred from the thin metal plate 12 to the metal fixing plate 7.
．． From this fixed plate 7, the magnetic circuit 5° is radiated into the air via the heat radiation fins 10, and the vibration membrane 9 may be burnt out! 511 can be corrected.

Since the speaker of the present invention is configured as described above, the thin metal plate attached to the diaphragm can dampen the vibration diaphragm's vibration and distortion in the low range, making it stable in terms of characteristics. It is possible to reproduce up to the target low range, and it can also be used as a 2-way or 3-way tweeter.In addition, the heat generated by the printed voice coil can be efficiently dissipated, which improves input resistance and improves quality. It also has the effect of making it safer and has great industrial value.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view showing a general speaker, FIG. 2 is a perspective view of a diaphragm portion of a conventional speaker, FIG. 3 is a perspective view of a fixing plate in an embodiment of the speaker of the present invention, and FIG. The figure is a perspective view of the same thin metal plate, Figure 6 is an enlarged top view of the same essential part, Figure 6 is a perspective view of a diaphragm having the same printed voice coil, and Figure 7 is a sectional view of the important part of the same speaker. . 1... Center pole, 2... Magnet, 3... Yoke, 4... Magnetic gap, 6... Magnetic circuit, 6...; ...long hole, 7
...Fixing plate, 8...Printed voice coil, 9...Vibration membrane, 1o...Radiating fin, 11...Baffle plate, 12...
Metal thin plate, 13...Small hole. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 2 Figure 3 Figure 5 Figure 6 Figure 17

Claims (1)

[Claims] A magnetic magnet is constructed by arranging rectangular parallelepiped-shaped magnets on both sides of a rectangular parallelepiped-shaped center pole so as to have a step at the top, and incorporating a yoke on the outer surface of this magnet that forms a magnetic gap with the upper part of the center pole. On the circuit, there is a vibrating wire with a printed voice coil installed at a position corresponding to the magnetic gap on the bottom surface, a thin metal plate with many small holes pasted on the top surface of this vibrating membrane, and bonded to the top surface of this thin metal plate. A speaker is constructed by arranging a laminated body of a metal fixing plate with long holes formed at positions corresponding to the magnetic gaps.