JPS6292700A - speaker device - Google Patents

Abstract

PURPOSE:To eliminate occurrence of distortion and color deviation in a picture even if the front part of the unit and a television picture are adjoined by providing a dust cap formed of magnetic material on the sound producing face side of a diaphragm made of magnetic material. CONSTITUTION:The unit is composed of a main magnet 1, a lower plate 2, a cancel magnet 3 an upper plate 4, an iron frame 5, an iron cover 6, a voice coil 9, a damper 10, an edge 11 and a cabinet 12, and a diaphragm 13 and a dust cap 14 are made of magnetic material respectively. As a countermeasure against leakage flux is made on the rear face of a dynamic loudspeaker similarly with usual examples, almost no leakage flux occurs. As for the front face part, occurrence of leakage flux is the same with former examples. However, as the diaphragm 13 and dust cap 14 are made of magnetic material, leakage flux pass inside of the diaphragm 13 and dust cap as shown by an arrow mark a, and accordingly, the value of leakage flux to the front of the dynamic loudspeaker decreases remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a speaker device, and particularly to improvement of leakage magnetic flux.

2. Description of the Related Art In recent years, with the spread of high-fidelity VTRs, video discs, etc., combinations of audio equipment and visual equipment have increased. For this reason, televisions and speakers are often installed adjacent to each other, and speakers with low leakage magnetic flux that do not have magnetic effects on the television screen have begun to become popular.

An example of the above-mentioned conventional speaker device will be described below with reference to the drawings. FIGS. 3 and 4 show cross-sectional views of conventional speaker devices.

In FIG. 3, 1 is a main magnet, 2 is a lower plate attached to one side of the magnetic pole of the main magnet 1, and 3 is a leakage flux canceling magnet attached to the lower plate 2. Reference numeral 4 denotes an upper plate that is in contact with the surface that becomes the other magnetic pole of the magnet 1, and an iron frame 5 that is in contact with the upper plate 4 and holds the vibrating section is provided. 6 is an iron cover attached to the upper plate 4 and the canceling magnet 3; 7 is a diaphragm made of a non-magnetic material; 8 is a dust cap attached to the diaphragm 7 and made of a non-magnetic material; 9 is a vibration plate; A voice coil is attached to the plate 7, 1o is a voice coil 9 and a damper attached to the iron frame 6, and 11 is an edge attached to the diaphragm 7 and the iron frame 6. 12 is a cabinet with an iron frame 6
It is in contact with

Regarding the conventional speaker device configured as above,
The operation will be explained below.

FIG. 4 is an enlarged cross-sectional view of a part of FIG. 3, and the names of the parts are the same as in FIG. 3.

First of all, regarding the rear part of the electrodynamic speaker, there is almost no leakage magnetic flux because the canceling magnet 3 and iron cover 6 shown in Fig. 3 are used to prevent leakage magnetic flux, but the front part has no leakage magnetic flux. Therefore, leakage magnetic flux (a) is generated from the iron frame 5 toward the lower plate 2.

Problems to be Solved by the Invention In the above configuration, the diaphragm 7. dust cap 8
Since the is made of non-magnetic material, leakage magnetic flux (b) is also generated at the front of the electrodynamic speaker. Therefore, if the front of the speaker device is adjacent to the TV screen, the influence of the leakage magnetic flux described above will occur. However, the present invention solves these problems and reduces the leakage magnetic flux from the front of the speaker device, so that even if the TV screens are installed adjacent to each other, the TV screen does not appear on the TV screen. The object is to provide a speaker device that does not cause distortion or color shift.

Note that under normal installation conditions, the front of the speaker and the TV screen are unlikely to be adjacent to each other, but when connecting a cord to the speaker or changing the installation location, the front of the speaker and the TV screen may There are many opportunities for adjacency, and it is necessary to solve the above problem.

Means for Solving the Problems In order to solve the above problems, the speaker device of the present invention has the following features:
A dust cap made of a magnetic material is provided on the sound emitting surface side of a diaphragm made of a magnetic material.

According to the above-described structure, the present invention uses magnetic materials for the diaphragm and dust cap of the speaker device to significantly reduce leakage magnetic flux at the front surface, thereby eliminating distortion and color misalignment on the television screen. I can do it.

EXAMPLE Hereinafter, a speaker device according to an example of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are cross-sectional views of a speaker device according to an embodiment of the present invention.

In FIG. 1, 1. 2. 3. 4. 5. 6.
9゜10, 11, and 12 are the main magnet, lower plate, and cancellation magnet, respectively, similar to those shown in Figure 3.

These are the upper plate, iron frame, iron cover, voice coil, damper, edge, and cabinet. and 1
3.14 is a diaphragm made of magnetic material, respectively;
Dust cap, for example, iron diaphragm, iron dust cap.

The operation of the speaker device of this embodiment configured as described above will be described below. FIG. 2 is an enlarged sectional view of a part of FIG. 1, and the names of the parts are the same as in FIG. 1.

First, regarding the rear part of the electrodynamic speaker, there is almost no leakage magnetic flux, as measures against leakage magnetic flux are taken as in the conventional example. Next, regarding the front part, leakage magnetic flux is generated as in the conventional example, but the diaphragm 7 and the dust cap 8
is made of magnetic material, the leakage magnetic flux shown by arrow 1 (b) in Figure 4 passes through the diaphragm and dust cap as shown by arrow (c) in Figure 2, and therefore the movement is reduced. The value of leakage magnetic flux to the front of the electric speaker is significantly reduced.

As described above, according to this embodiment, by using magnetic materials for the diaphragm and the dust cap, distortion and color misalignment on the TV screen can be prevented even if the front part of the speaker device and the TV screen are placed adjacent to each other. can do.

In the embodiment of the present invention, the rear part of the electrodynamic speaker is designed to prevent leakage magnetic flux, but it goes without saying that a speaker without any countermeasures may be used.

Effects of the invention - As described above, the present invention provides a dust cap made of a magnetic material on the sound emitting west side of a diaphragm made of a magnetic material, thereby making it possible to connect the front part of the speaker device and the television screen. Even when placed adjacent to each other, it is possible to eliminate distortion and color misalignment on the TV screen.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the speaker device of the present invention, FIG. 2 is a cross-sectional view of a portion of FIG. 1 enlarged and showing the flow of magnetic flux to the front part, and FIG. FIG. 4 is a cross-sectional view showing the speaker device. FIG. 4 is an enlarged cross-sectional view of a portion of FIG. 3, showing the flow of magnetic flux toward the front surface. 1... Main magnet, 2... Lower plate,
3...Cancel magnet, 4...Top plate, 6...Frame, 6--Cover, 7...River/diaphragm, 8... ...Dust cap, 12...Cabinet, 13...Diaphragm, 14...Dust cap. Name of agent: Patent attorney Toshio Nakao and 1 other person0-
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Claims (1)

[Claims] A speaker device characterized in that a dust cap made of a magnetic material is provided on the sound emitting surface side of a diaphragm made of a magnetic material.