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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
magnetic shield type speaker used for audio equipment and video equipment. (Prior Art) A
conventional magnetically shielded speaker will be described with reference to FIG. The
conventional magnetic shield type speaker comprises a field portion comprising a bottom plate 3
having an annular top plate 1, an annular main magnet 2 and a center pole, a frame 4 coupled to
the upper surface of the top plate 1, and the above frame 4 Supported by the suspension 5
whose outer periphery is fixed, and the voice coil 6 inserted without eccentricity into the annular
magnetic gap formed by the above-mentioned field portion, and the voice coil 6 at the center
portion is coupled to the above The bottom plate 3 of the above-mentioned field section is fixed
to the peripheral portion of the frame 4 together with the gasket 7 and further to make a general
loudspeaker comprising a diaphragm 9 whose center surface is covered with a dust cap 8 A ringshaped sub-magnet 10 magnetized in the opposite direction to the ring-shaped main magnet 2 is
fixed to the lower surface, and a magnetic shielding measure is provided to cancel the leakage
magnetic flux. Although a shield cover is generally provided to enhance the magnetic shield
effect, a configuration in which this is omitted is shown as a conventional example because of
cost reduction. (Means for Solving the Problems) However, in the second configuration, the
annular secondary magnet 10 is used, and therefore, the leakage flux in the direction
unnecessary for practical use is also cancelled, and the effective utilization rate is low. There was
a problem that. Therefore, if the auxiliary magnet is ring-shaped. There is also a problem that the
size is large, the weight is heavy, and the material cost is high. Moreover, the large ring-shaped
sub magnet has a problem that the repulsive force with the ring-shaped main magnet of the field
section is large, and positional deviation is easily generated at the time of bonding. SUMMARY OF
THE INVENTION The present invention solves the above problems, and provides a low cost
magnetic-shielded speaker in which adhesion to a field portion is easy because the effective
utilization of magnetic flux is high and the repulsive force is small due to small submagnets. It is.
(Means for Solving the Problems) In order to solve the above-mentioned problems, the present
invention makes the formation of the sub-magnet rectangular so as to act only in the direction
required for low leakage. (Operation) By adopting a rectangular submagnet, the size of the
submagnet is reduced, the weight is reduced and the price is reduced, the integrated repulsive
magnetic force is also reduced, and the adhesion of the submagnet to the bottom plate is
facilitated. In addition, leakage can be reduced in the direction practically required according to
the purpose of use of the auxiliary magnet, and the cost and resource can be saved by using the
magnet with the minimum size and weight. An embodiment of the present invention will be
described with reference to FIGS. 1 and 2. FIG.
1 (a) and 1 (b) are a side sectional view and a plan view of a rectangular sub-magnet 11
according to the present invention, wherein the rectangular sub-magnet 11 is in the form of a flat
plate having short sides and long sides. FIG. 2 is a back view of the magnetically shielded speaker
according to the present invention, in which the rectangular sub magnet 11 is adhered to the
back of the bottom plate 3 so that the long side is parallel to the terminal plate 12 formed at Leakage, which is necessary for practical use. (Effects of the Invention) As described
above, according to the present invention, since the rectangular submagnet can be most
effectively used in the direction requiring low leakage, the effective utilization of magnetic flux is
high, and the size of the submagnet is small. Since weight reduction is achieved, cost can be
reduced. In addition, since the secondary magnet is small, the repulsive magnetic force with the
ring-shaped main magnet is small, the bonding operation is easy, the occurrence of positional
deviation is reduced, and a magnetically shielded speaker with stable quality can be obtained.
Brief description of the drawings
1 (a) and 1 (b) are a side sectional view and a plan view of a rectangular sub-magnet according to
the present invention, FIG. 2 is a back view of the magnetically shielded speaker according to the
present invention, and FIG. 3 is a cross section of a conventional magnetically shielded speaker
Reference Signs List 1 · · · top plate, 2 · · · ring-shaped main magnet, · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · voice coil, 7 · · · · · · · · · · · Dust cap 9 Diaphragm 10 Ring sub magnet 11
Rectangular sub magnet 12 Terminal board. Fig. 1 (a) (b) 11 --- Giant shape 11 Ishihara Ira Fig. 2
Fig. 3 10 9 2 2
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