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JPS51149621

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DESCRIPTION JPS51149621
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electromagnetic speaker, FIG. 2 is a partially cutaway front view of the speaker in one
embodiment of the present invention, FIG. 3 is a cross-sectional view thereof, The figures are left
in cross section to show another embodiment. 4 ... Yoke, 5 ... Drive magnetic pole, 6 ... Drive coil,
7 ... Magnet, 8 ... Diaphragm, 9 ... Armature. Fig. 1 Fig. 2 Fig. 3 Fig. 4 difference I1 · 1 i lead σJ-53
1
DETAILED DESCRIPTION OF THE INVENTION The present invention is easy to make and to use
magnetic speakers 1 *. Conventional electromagnetic speaker company, as shown in FIG. 1, an
annular plate l! On a courtesy magnet (1) such as ferrite! Because it is an alternating current
generated by the drive current, the loss of the # magnetic core is large, and also the reef or the
plate of the upper 礪 礪 F (! I, ai is held and pressed by i because NL! 1I166 was easy to cause, it
was easy to cause a magnetic defect ・ This consideration solves the conventional fault like the
above. The details (1) 1-Go-A4- will be described based on the direction of 11 g as described
below. In FIG. 2 and FIG. 6, (4) is a bottomed cylindrical yoke which is more likely to be
encumbered by the magnetic material, and a drive magnetic pole (6) is provided inside the yoke
(4). The drive coil (6) is provided on the outside of the), and the drive coil (the outer 1ll K magnet
(7) of the button is further provided concentrically, and the magnetic circuit of the stain magnet
type speaker is formed by a wedge etc. . At the upper end of the yoke (4), a vibration system in
which a diaphragm made of a magnetic material (sub and armature (9)) are integrated is joined.
According to the above configuration, first, the magnetic path can be made by the magnet (the
magnetic flux emitted from the magnet 7 is the yoke (4), the diaphragm (S), the armature [111,
ffi 萄 strength f5), etc. The armature i9iK is a downturn which is attracted toward the drive
magnetic pole 1111 by the action of the DC bias magnetic flux. In this state, when an audio
current flows through the drive coil (6), the magnetic flux 't-passing DC bias magnetic flux
changes to change the vague attraction acting on the scattering aid thread, causing the
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diaphragm (8) to vibrate. At this time, the alternating current magnetic field emitted from the coil
before winding (6) directly travels through the air, the leaked reef east, and the #h magnetic reef
(6), the yoke (1) and the diaphragm (8J1 armature (9) (2) A magnetic path or the like formed
from i and 5), q knee 1'1 ≧ m-φ 1: 1 acts on the DC bias magnetic flux acting on the effective K
k dynamic system. FIG. 4 shows another embodiment of the present invention, wherein the drive
coil (6) is outside the magnet (7) II! The operation is similar to that of the above embodiment
151. As described above, according to the present invention, since the magnetic flux does not
pass through the inside of the permanent magnet as in the prior art, since it does not pass
through the inside of the permanent magnet (3-5 in alloy magnet and 1 in barium ferrite),
Magnets that are vulnerable to impact have little damage or damage because they are protected
from external force, and the diameter of the magnet is also reduced by one, so that the cost is low
and the practical value increases. .
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