JPS61161894A - Speaker system - Google Patents

Abstract

PURPOSE:To decrease a leaking magnetic flux by fitting a rubber magnet in the direction having a polarity and an opposite polarity of a magnet used at a magnetic circuit of the speaker inside the speaker cabinet. CONSTITUTION:A yoke 3 is provided at one edge surface of a magnet 1, a plate 4 is provided at other edge surface, and an iron-made frame 5 to hold an oscillating part in connection with the plate 4 is provided. In a magnetic gap 7 formed annularly at a center pole 3 and a plate 4, a voice coil 6 connected by a damper 8 is provided and linked to a diaphragm 9 together with the damper 9. Here, at the side surface of a speaker cabinet 13, a rubber magnet 14 is fitted so as to have the polarity opposite to the polarity of the magnet 1. Thus, a magnetic flux, which leaks from the iron-made frame 5 to the cabinet 13 side, is absorbed, and the leaking magnetic flux is widely decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a loudspeaker system whose purpose is to reduce magnetic leakage.

Conventional technology FIG. 6 is a cross-sectional view of a conventional speaker that does not take magnetic leakage into consideration. 1 is a magnet, and 2 is a yoke with a center ball 3 in the center, which is provided in contact with one end surface that becomes the magnetic pole of the magnet. . Reference numeral 4 denotes a plate that is in contact with the surface that becomes the other magnetic pole of the magnet, and an iron frame 5 that is in contact with this plate 4 and holds the vibrating section is provided.

A voice coil 6 is supported by a damper 8 to be held in a magnetic gap 7 formed in an annular shape by the center ball 3 and the plate 4. The voice coil 6 and the damper 8 are coupled to a cone diaphragm 9. Vibration plate 9
An edge 10 is integrally fixed around 0, and the edge 1o is adhered to the frame 6 and pressed and fixed by a paper arrow 11. 12 is a dust cap, and 13 is a cabinet.

The operation of the electrodynamic speaker configured as above will be described below. FIG. 7 is a cross-sectional view of the same speaker as in FIG. 6, excluding the vibration system, and the names of each part are the same as in FIG. 6. The left half of this figure shows a model of the flow of magnetic lines of force, and the operation of the conventional example will be explained based on this figure.

When the polarity of the magnetized magnet 1 is set such that the plate 4 side is the N pole and the yoke side is the S pole, the lines of magnetic force coming out of the N pole enter the S pole through various paths. All lines of magnetic force other than the main magnetic flux A for generating force in the voice coil 6 become unnecessary leakage magnetic flux.

Problems to be Solved by the Invention According to the conventional example, leakage magnetic flux causes color shift in the TV image when speakers are used at the same time as the TV.

This caused problems such as distortion.

Means for Solving the Problems The present invention reduces leakage magnetic flux by attaching a rubber magnet to the inside of a speaker cabinet using a Stella pull or the like.

Effect: By the above means, leakage magnetic flux is reduced by attaching a rubber magnet inside the speaker cabinet in a direction having a polarity opposite to that of the magnet used in the magnetic circuit of the speaker.

Embodiment FIG. 1 shows a sectional view of an embodiment of the present invention. In this figure, numbers 1 to 13 have the same names as in the conventional example, so their explanation will be omitted.

14 is a rubber magnet made of soft barium ferrite that has been mechanically rolled to improve its orientation, and is attached to the side of the speaker cabinet using a Stella pull or the like so that it has a polarity opposite to that of magnet 1. .

FIG. 2 is the embodiment shown in FIG. 1 with the vibrating part removed, and the left half shows the flow of magnetic lines of force as a model. As can be seen in FIG. 2, the flow of magnetic lines of force from the plate 4 in contact with the magnet 1 can be considered divided into a main magnetic flux part A and the other leakage magnetic flux. The magnetic flux leaking from the iron frame 6 to the cabinet 13 side is caused by the rubber magnet 1.
The portion of the magnetic flux C' that is absorbed by the speaker cabinet 4 and leaks out of the speaker cabinet is significantly reduced.

FIG. 3 shows a second embodiment of the invention, in which 14 rubber magnets are fixed to the cabinet with staple pulls 16. In this figure, the rubber magnet is bent and attached to surround the field part of the unit. Therefore, according to this embodiment, by attaching the rubber magnet to surround the field part, it is possible to not only reduce the leakage magnetic flux in the side direction of the speaker as in the first embodiment, but also reduce the leakage magnetic flux in the rear side and front side. It has an effect that can be reduced.

Figure 4 shows a third embodiment of the present invention, in which a rubber magnet is attached before assembling the cabinet, and since the rubber magnet can be easily processed, the V
The cabinet is assembled using the folding method by creating grooves. Figure 6 shows the assembled cabinet. Therefore, according to this embodiment, the rubber magnet can be easily attached to the entire inside of the cabinet.

Effects of the Invention As described above, the present invention can (1) reduce leakage magnetic flux to the outside of the speaker cabinet.

(2) Since the rubber magnet attached to the cabinet is soft, it can be bent and used at the corners of the cabinet, so leakage magnetic flux can be effectively reduced in terms of installation method.

(3) Rubber magnets can be easily attached to the cabinet using a Stella pull, etc., so no special jigs are required and workability is good.

(→ Rubber magnets are easy to process, so you can attach the rubber magnets before assembling the cabinet, and ■ grooves can be created on both sides of the cabinet, allowing you to assemble the cabinet with the rubber magnets attached.

Excellent effects such as these can be obtained.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views showing one embodiment of the present invention and a cross-sectional view explaining the leakage magnetic flux situation, and FIG. 3 is a cross-sectional view showing the leakage magnetic flux situation showing the second embodiment of the present invention. The sectional view, FIG. 4, and FIG. 6 are a developed view and a front view of a cabinet showing a third embodiment of the present invention. FIGS. 6 and 7 are cross-sectional views of conventional speaker systems. 1...Magnet, 2...Yoke, 3
・River...Center hole, 4...Plate, 5
・・Mark・Iron frame, 7・・・・Magnetic gap,
13... Cabinet, 14... Rubber magnet. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 tS--Steryl

Claims (1)

[Claims] A speaker system characterized by attaching a rubber magnet to the inside of a speaker cabinet.