JPH06351098A - Speaker - Google Patents

Abstract

PURPOSE:To provide a speaker characterized by both a thin type and high sound quality in respect to speakers to be used for various pieces of audio equipment. CONSTITUTION:A supporter 2 is connected on the bottom surface of a frame 1, a magnetic circuit 7 using a ring-like magnet 6 magnetized in a radial direction is joined with a centering pin 3 provided to the upper end of the supporter 2, a voice coil 9 is inserted into the magnetic gap of the circuit 7, diaphragm 8 and the outer periphery of a suspension 10 are connected to the frame 1, the inner periphery of the suspension 10 is connected successively to the voice coil 9, and the projection area of the circuit 7 for the diaphragm 8 is set up to <=1/2 of the effective area of the diaphragm 8. Consequently the thickness of the magnetic circuit 7 can be reduced, a vibration system and the circuit 7 in optimum shapes for sound quality can be used and an adverse influence from the circuit 7 arranged in the front surface of the diaphragm 8 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used for various audio equipments in various fields such as those for HiFi and those for vehicle.

[0002]

2. Description of the Related Art In recent years, due to diversification of applications and use conditions,
There is an increasing need for thin speakers with high sound quality.

FIG. 2 shows a cross section of a typical speaker in the conventional example. In FIG. 2, 21 is a lower plate, 22 is a magnet, 23 is an upper plate, 24 is a frame, 25 is a voice coil, 26 is a suspension, 27 is a diaphragm, and 2
Reference numeral 8 denotes a dust cap, and in the case of thinning such a speaker, conventionally, each component has been thinned.

FIG. 3 shows another conventional example in which the speaker is made thinner. In FIG. 3, 31 is a yoke, 32 is a magnet, 33 is a top plate, 34 is a suspension, 35 is a voice coil, and 36 is a vibration. A plate, 37 is a frame, 38 is an edge, 39 is a dust cap, and 40 is a gasket. In such a conventional example shown in FIG. 3, a cone type diaphragm 36 is used in the reverse direction, and a magnetic circuit is housed under the diaphragm 36 to achieve a thin structure. It was possible to make the device thinner than that of the above structure.

[0005]

However, in the above-mentioned conventional configuration, in the case of the structure shown in FIG. 2, making the diaphragm 27 to be extremely shallow causes a decrease in the high frequency limit reproduction frequency and disturbance of the frequency characteristic. Also, thinning the magnetic circuit leads to sound quality deterioration due to the amplitude limitation and the efficiency reduction of the voice coil 25.

Further, in the case of the structure shown in FIG. 3, the sound pressure radiation is excessively diffused, resulting in a decrease in efficiency and deterioration of the axial characteristics, which limits the application and the support of the diaphragm 36 is unstable. There was also the problem that it was weak to large swings. As described above, it has been extremely difficult to achieve both thin type and high sound quality with the conventional speaker.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a speaker which is free from the constraint conditions of the prior art and is capable of exhibiting extremely high-quality sound performance while being thin. It is what

[0008]

In order to solve this problem, the speaker according to the present invention has a supporter integrally formed with a center pole extending in the front direction of the frame at the center of the frame. A ring-shaped magnet with a radial orientation is provided at the tip of the magnetic circuit, which is connected to the magnetic circuit so that the magnetic gap faces the front direction of the frame, and the voice coil centered around the frame is fitted into the magnetic gap. The outer peripheral portion of the diaphragm connected to the above is connected, and the projected area of the magnetic circuit with respect to the effective area of the diaphragm is 1
The configuration is / 2 or less.

[0009]

With this configuration, it is possible to reduce the thickness of the magnetic circuit of the speaker, use the vibration system and the magnetic circuit having the optimal shape in terms of sound quality, and reduce the magnetic circuit existing on the front surface of the diaphragm. It is possible to prevent adverse effects and simultaneously realize thinness and high sound quality.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing the structure of the speaker in the embodiment. In FIG. 1, 1 is a frame, 2 is a supporter, 3 is a centering pin, 4 is a center pole integrated type yoke, and 5 is a yoke 4. A center guide hole, 6 is a ring-shaped magnet magnetized in the radial direction, 7 is a magnetic circuit, 8 is a diaphragm, 9 is a voice coil, 10 is a suspension, and 11 is a dustproof net.

In the speaker of the present invention having such a structure, first, the supporter 2 integrally formed with the center pole extending in the front direction of the frame 1 is connected to the center of the bottom surface of the frame 1, and the upper end thereof has a high diameter accuracy. Centering pin 3
To provide. The supporter 2 needs to be non-magnetic, has high strength, and has a high heat dissipation property, and is preferably made of aluminum die cast. If the frame 1 is die cast, it may be integrated. A heat-resistant resin may be used when a large input does not enter the speaker and heat dissipation is not required.

Next, the suspension 10, the diaphragm 8 and the voice coil 9 are sequentially inserted into the supporter 2, and the diaphragm 8 and the suspension 1 are aligned while the centers are aligned with the centering pins.
The inner circumference of 0 is fixed to the voice coil 9 and the outer circumference is fixed to the frame 1. The magnetic circuit 7 is formed by mounting the ring-shaped magnet 6 magnetized in the radial direction on the yoke 4.
Insert the center guide hole 5 and the centering pin 3 into the supporter 2 and fix them.

It should be noted that the presence of the magnetic circuit 7 as a shield on the front surface of the diaphragm 8 naturally affects the characteristics of the speaker.
According to the result of the experiment, when the projected area of the magnetic circuit 7 exceeds 1/2 of the effective area of the diaphragm 8, the sound quality is greatly adversely affected. Therefore, in this embodiment, the high-energy product magnet of rare earth is formed in a ring shape with radial orientation and combined with the yoke 4 integrated with the center pole to realize a very small and powerful magnetic circuit 7. As a result, the adverse effect on the sound quality is improved, and the magnetic circuit 7 is made to have an optimum size, so that the equalizer effect is positively utilized to improve the sound quality.

A dustproof cushion 11 is provided between the magnetic circuit 7 and the diaphragm 8 to prevent foreign matter from entering the magnetic gap, but this is not always necessary depending on the operating environment.

[0016]

EFFECTS OF THE INVENTION The speaker of the present invention configured as described above can be realized as (1) a thin speaker by reducing the thickness of the magnetic circuit. (2) It is possible to use a vibration system and a magnetic circuit having an optimal shape for sound quality. (3) The adverse effect from the magnetic circuit arranged on the front surface of the diaphragm can be eliminated. (4) The sound quality can be improved by utilizing the equalizer effect of the magnetic circuit. It is possible to obtain many effects such as.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a speaker according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a conventional speaker.

FIG. 3 is a half sectional view showing a configuration of a conventional speaker.

[Explanation of symbols]

 1 Frame 2 Supporter 3 Centering Pin 4 Yoke 5 Center Guide Hole 6 Magnet 7 Magnetic Circuit 8 Vibration Plate 9 Voice Coil 10 Suspension 11 Dustproof Net

Claims (1)

[Claims] 1. A supporter integrally formed with a center pole extending in a front direction of the frame is coupled to a central portion of the frame, and a radial-oriented ring-shaped magnet is provided at a tip of the center pole of the supporter to form the magnetic gap. A magnetic circuit arranged so as to face the front surface of the frame is coupled, and an outer peripheral portion of a diaphragm coupled around a voice coil fitted in the magnetic gap is coupled to a peripheral edge of the frame. A speaker in which the projected area of the magnetic circuit is 1/2 or less of the effective area of the diaphragm.