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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial perspective view of a conventional
ribbon-type speaker, FIG. 2 is a cross-sectional view along II in FIG. 1 (magnetic circuit portion),
and FIG. It is a magnetic circuit part horizontal cross-sectional view of an example. Cギャップ。
Fig. 4-103-Japanese Utility Model Application No. 52-13844 (2) 3b 2nd figure / 5b 8/5 α?
b/b? // α-104
DETAILED DESCRIPTION OF THE INVENTION In the present invention, the ribbon speaker, the
external Ig leakage flux is reduced, and the permanent magnet is used to increase the magnetic
flux density of the magnetic gap to zero. It is 1m is a sub-JIIO ribbon 濶 speaker O- Toshizushi ,,.
1 □ view, FIG. 2 is xi! IKおける! It is a figure which shows the magnetic circuit part of -I cross
section. Reference numeral l denotes a rectangular permanent magnet, and a cathode 2 is
bonded to the surface go and 1'b facing the permanent magnet lO. The l-fertilizing agent e-111 t
13 m, 23 t + i C, as in the case of the evening 2 adjoins a plate 5 made of a magnetic material. As
shown in FIG. 2, as shown in FIG. 2, in the magnetic gap 8 formed by the end face 1 + a1 x sb of
the two plates Sk 3%, a foil of aluminum alloy is used in the direction of an arrow 6 To set it up.
In addition, the horn 5 is installed to improve the loudness E rate. させる。 However, in order to
improve the performance of the ett structure, if it is intended to increase the area between the
diaphragms 40, the area of the magnetic gap 8 and the opposing area of the magnetic gap 8
must be increased. As a result, the air gap magnetic flux density is reduced to C and k, and the
response to the audio current is reduced. In addition, the spread of the leakage flux to the
external space is large and steep. If this go magnetic circuit is used in a television, there is a
disadvantage that the image is distorted. , This OII sbeaker was used, because it was K11m1. The
present invention overcomes the disadvantages of the prior art as described above, suppresses
the leakage flux radiated from the magnetic circuit portion and increases the air-gap flux density
in the ribbon conductor / diaphragm setting portion, thereby improving the performance. The
purpose is to provide a speaker. The present invention will now be described by way of example
with reference to FIG. FIG. 3 is a cross-sectional view of FIG. 2 and an I @@ like magnetic nonmagnetic circuit section, and in FIG. 1 WJ to FIG. Reference numeral 11 denotes an auxiliary
insertion magnet, which is joined to the upper surface 831.231 of the longitudinal cross-section
inverted letter-shaped carving 2a, tk. When the permanent magnet 101 & surface vicinity is
magnetized at 11 @ and 11bil vicinity is magnetized at 8 poles, the vicinity of the joint surface
with the auxiliary permanent magnet XisOm-Yu is magnetized at 1 pole, and the opposite surface
is magnetized at 8 poles. By magnetizing the vicinity of the junction surface with the magnetic
pole to 8 poles and the opposite face to 1 pole k, I think -3 from tk, O radiation leakage flux is
fixed to the magnetic circuit portion aCt and the magnetic gap aO flux density is You can break it
For comparison, an example of a magnetic flux line is shown by a dotted line in FIG. In the case of
the same shape, magnetic characteristics, etc. of the permanent magnet 1 and the batter, the
magnetic flux density in the magnetic gap @ Kfi becomes 4380 in 4000 G% in FIG. 2 and the
effective air gap magnetic flux density is It will improve about * 6%. An effect is obtained and a
friend. As described above, when the present invention is implemented, the next O effect can be
obtained from k. 1) Leakage flux to the outside of the magnetic circuit portion is suppressed by
using the auxiliary permanent magnet. 2) The effective air-gap flux density is increased, and the
characteristics of the speaker 7 '¥ # positive is improved.