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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
speaker, FIG. 2 is a cross-sectional view of an essential part of the speaker in one embodiment of
the present invention, and FIG. 3 is a cross-sectional view of the same speaker. 20 ...... lower plate,
21 ...... magnet, 22 ...... on the plate, 23 ...... yoke, 25 ...... voice coil. Fig. 1 77-Fig. 22 48 / 98,133
(2) Fig. 2 22 / \ V /////// A A /, // / / / / 2/2/2/1 3 / Figure 78-
DETAILED DESCRIPTION OF THE INVENTION The present invention reduces the magnetic
leakage and allows the design of a magnetic coil for use with a magnet and a large-diameter
voice coil to be accommodated. Try to provide Fig. 1 shows a conventional speaker, and in Fig. 1
(1) is a lower plate with a center pole at the center, + 1! Ring-shaped ferrite magnet, (3) is the
upper plate, C4) is a poisper, (6) is a damper. ] (N is the work around, di (6)? Corn paper having
(8) is das 48-98133-022, huge cap, (9) is arrow, Qo # i frame, and αp is a frame-opened
window. This type of speaker, K external ferrite external magnetic type magnetic circuit is using
anti-magnetic, high magnetic force magne, because the mag 5 net height is small from the outer
periphery of the upper plate (3) (1) KII There are many magnetic fluxes that leak and there is a
defect that the utilization efficiency of the magnet is JIS. Pick-up button "This invention
eliminates the above-mentioned conventional 0 defect" 't2' '"" ", an embodiment of the present
invention will be described with reference to FIG. 2 and FIG. In FIG. 2 and FIG. 5, the dovetail is a
ring-shaped lower plate, and (c) is a high coercivity magne, such as a ferrite magnet provided on
the upper plate i 'II 8 of the lower plate. A ring-shaped upper plate provided on the upper surface
of the magne to (2), a cylindrical yoke provided on the outer periphery of the lower plate, and a
gradient attached to the upper plate candle. The ring (2) is a voice coil wound around a voice coil
bobbin. The voice coil 1 is wound in a magnetic gear between the yoke 1 and the upper plate @.
The letter m is a cone paper having a surface and a die, and the upper part 4g-98133-035 is a
voice coil bobbin sacrificial attached to the cone paper. The side is the upper P voice coil bobbin
"ll5t support, has the damper which has the (support) above;-is attached to the paper (support),
the dust cap attached, the ring is the lower plate e! It is 7 frames attached to IIK, and this frame
'(flKit, a plurality of windows ° C is formed, dustproof cloth on this window dovetail, (2) hole of
0Md lower plate ω hole , K provided dustproof cloth, candle is arrow paper. Thus, the magnetic
circuit of the woodwork speaker is lower plate, magu, toe, upper plate, and so on! -Because of the
high coercivity of Magne and To, they can be returned to the yoke.
Further, in the magnetic circuit of the speaker according to the present invention, since
Kashiwato mainly leaks in the millstones of the upper and lower plates, the leakage flux is
smaller and the utilization efficiency of the magnet is increased as compared with the
conventional example. According to the measurement results of the present inventors, it was
possible to increase the utilization effect t of the magnet by 15 to 25-as compared with the
conventional external ferrite external magnet type speaker. In addition, the speaker of the
present invention is currently used outside! Magnet of type B and m-size, 48-98133-04 □ 4 '-0
large low at the top! The magnetic circuit for the voice coil can be designed, and the large and
small diameter voice filer Mako is a book that has four advantages in terms of anxiety and cost.
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description, jps4898133
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