JPS63224590A - Speaker - Google Patents

Abstract

PURPOSE:To miniaturize the sound field system by designing the diaphragm in a way that at least one part of the cross-sectional shape of the diaphragm in the radiating direction entirely differs from other parts. CONSTITUTION:A magnet 2 is adhered onto a plate 1 with a ball piece and a top plate 3 is adhered. A coil 9 of a voice coil 8 whose surrounding is supported by a damper 7 fixed to a frame 6 is arranged to a magnetic gap 5 so as not to be in contact with the surrounding. A diaphragm 10 is adhered to the coil 8 and the outer circumference of the diaphragm 10 is adhered to the frame 6 via an edge 11. A dust cap 12 is adhered to the tip of the coil 8. A basic shape 10a is adopted for the left half of the diaphragm and other shape 10b is employed for the right half. Since plural speakers are replaced into one speaker in this way, the sound field system is miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a speaker used in various audio products.

2. Description of the Related Art A conventional external magnetic type electrodynamic speaker has a configuration as shown in FIG. That is, a donut-shaped magnet 2 is bonded onto the pole piece-equipped plate 1, a top plate 3 is bonded to the magnet 2, and a magnetic gap 6 is formed by the pole piece 4 and the top plate. A wire ring 9 of a voice coil 8 held by a damper 7 whose periphery is fixed to a frame 6 is arranged in the magnetic gap 5 so as not to touch the periphery. A diaphragm 1o is bonded to the voice coil 8, and the outer periphery of the diaphragm is bonded to the frame via an edge 11. Furthermore, a dust cap 12 is attached near the center of the diaphragm to prevent dust from entering the magnetic gap. The above is the structure of a general electrodynamic speaker.

FIG. 4 shows a speaker made for the purpose of improving the directional characteristics of conventional speakers. This is different from conventional speakers in that the arrangement of the diaphragm 1o is different, with the center of the diaphragm 1o protruding from the outer periphery of the diaphragm. In the speaker configured in this manner, the interference at the listening point of sound from each part of the diaphragm 10 is smaller than that of a general speaker, so a speaker with good sound diffusion can be obtained.

Problems to be Solved by the Invention However, the use of a speaker with such a configuration takes advantage of its good sound dispersion properties, such as car-mounted door speakers, high-frequency sound field reproduction speakers, etc. The main points are those whose points are not on the speaker center axis.

Therefore, the characteristics required of speakers in these applications are that the sound pressure-frequency characteristics in one direction toward the listening point are flat, and in other directions, the acoustic power is flat and suitable for sound field reproduction. It's about being there. However, conventional speakers.

In speakers with circular, elliptical, or polygonal diaphragm shapes, the cross-sectional shape of the diaphragm in the radiation direction is the same at multiple locations, so it is not possible to obtain a specific sound pressure-frequency characteristic in only one direction. It has its drawbacks. The present invention aims to provide a speaker that can solve this problem.

Means for Solving the Problems Accordingly, in the present invention, the diaphragm is configured to have at least one portion whose cross-sectional shape in the radial direction is completely different from other portions.

Function: In a speaker configured as described above, the shape of the diaphragm differs in a certain direction from that in other parts.

The sound pressure-frequency characteristics in this direction can be differentiated from other parts to obtain the desired characteristics.

Embodiment FIG. 1 shows an embodiment of the present invention. That is, the magnet 2 is bonded onto the pole piece attached plate 1, and the top plate 3 is further bonded to the magnet 2. A wire ring 9 of a voice coil 8 held by a damper 7 whose periphery is fixed to a frame e is arranged in the magnetic gap 6 so as not to touch the periphery. A diaphragm 10 is joined to the voice coil 8, and the outer periphery of the diaphragm is joined to the frame 6 via an edge 11. A dust cap 12 is attached to the tip of the voice coil 8. Here, the left half of the diaphragm 10 has a basic diaphragm shape 10 &
, the right half is another shape 10b.

Figure 2 shows the sound pressure-frequency characteristics of each.

Since the main purpose of the basic diaphragm 101 is to reproduce the sound field, the reproduction band is 10KH2 or less, and the diaphragm 1ob of the irregularly shaped part is
Since this is the part in the Fi listening direction, the playback band is set to 16 sections ■2. All characteristics are directional characteristics in the 46'' direction.

Effects of the invention In recent years, the importance of sound field reproduction has been recognized, and in order to ideally reproduce the sound field, coaxial beakers with two speakers with their central axes tilted, and multiple speakers with the same tilted central axes have been developed. However, the speaker Fi of the present invention is an epoch-making product that can replace these multiple speakers with a single speaker, and is an outstanding feature of these sound field reproduction systems. It is an invention of great industrial value that can have a great effect on miniaturization and cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the speaker of the present invention, Fig. 2 is a sound pressure-frequency characteristic diagram in the 46° direction of the speaker of the present invention, Fig. 3 is a cross-sectional view of a general external magnetic type electrodynamic speaker, and Fig. Figure 4 is a sectional view of a speaker with improved directional characteristics. 1. River: Freight with pole piece, 2. River: McNet, 3. Top plate, 6. River: Magnetic gap, 6. River: Frame, 7. Damper, 8...Voice coil, 9...Voice coil wire, 10&. 10b... diaphragm. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
With pole piece 6- Frame 12- Tasto Cap Figure 2 IK 5K lax 2! Ox Shu liquid role 3
Figure 4

Claims (1)

[Claims] A speaker configured such that the center of the diaphragm protrudes from the outer periphery of the diaphragm, characterized in that the diaphragm has at least one portion whose cross-sectional shape in the radial direction is different from the shape of other portions. speaker.