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Description 1 Title of Invention
Low leakage flux speaker
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
with significantly reduced leakage flux. In general, it is preferable that the leakage flux of the
speaker is small. However, particularly for a speaker for a color television receiver, a low leakage
flux type is required. That is, generally in a color television receiver, a speaker is disposed at the
lower or side of a Braun tube, but in such a configuration, when a large leaked magnetic flux is
generated from the speaker, the electron beam is single point on the fluorescent surface of the
Braun tube If the problem of the occurrence of color misregistration occurs, it becomes K.
Therefore, much effort has been conventionally made to reduce the leakage flux, and the
configuration as described below has been put into practical use at present. However, each of
these prior arrangements had disadvantages and was not a completely satisfactory book. First, a
conventional leaked flux type speaker and its defects will be described based on FIG. (1) A
conventional internal magnet type speaker shown in FIG. 1, which has a full Nico magnet core at
the inner center of the yoke 1 and a voice coil, diaphragm not shown, and a frame 3 and others
not shown on the top. EndPage: It is a book that arranges etc. In this type of speaker, the leakage
flux is very small because the magnet is surrounded by the yoke. Therefore, it can withstand use
in an electric device that is susceptible to leakage fB such as a color television receiver. However,
it is a cast magnet formed by mixing metals such as Al 2 l 1 i B stone t 1 flumonium, nickel,
complex, etc., and it is extremely expensive. May be difficult to obtain. After all, the inner VB type
speaker has no problem in performance but there is a problem in one price. (2) The first figure
shows an external magnet type speaker having a shield cap (-). In order to eliminate the abovementioned drawbacks in the internal magnet type speaker, an external magnet type capable of
having a relatively inexpensive ferrite magnet is adopted, and the leakage flux inevitably
generated in connection with this is shielded. It is this type of speaker that is pressed to prevent
by. Lower plate, upper plate. And, a field section is constituted by an annular ferrite magnet weir
provided between the two, and this field section is covered by the shield cover 7 and the upper
plate! The frame is fixed on the top, and a voice coil, * moving plate, etc. not shown are also
The disadvantage of this type of loudspeaker is that the leakage flux can not be made sufficiently
small. That is, in general, this type of loudspeaker has several times as much leakage flux as the
internal magnet loudspeaker. Therefore, the speaker must be disposed away from the cathode
ray tube so as not to give a shadow to the electron beam, which will greatly limit the design of
the color television receiver. (3) FIG. 3 shows an external magnet type speaker in which a shield
clip and a frame are integrated. This is a modification of the loudspeaker of the type shown in
FIG. 2, but it is similar to the loudspeaker of the basic construction and operation # -i Fig. Λ and
therefore not complete with regard to leakage flux. (4) What is shown in FIG. 5 is another
conventional speaker field portion provided with another magnet for canceling out the leakage
magnetic flux to 2 in order to eliminate the above-mentioned drawback. -See iztzt)). 5. The
speaker's field part comprises a six core 10 having a bottom plate t, a first ring-shaped magnet 1
/ which surrounds the core io, and a first ring-shaped window F gap l between the core 10 The
top plate 3/9 provided on the magnet 1/1 to be formed, the 10 second magnet 14 I attached to
the lower surface of the bottom plate 9, and the second magnet 14! Of the lower surface of the
first magnet 11 and the outer periphery of the first magnet ll in the second annular window IllI!
It is comprised from the cover nano which forms + s. 1.! The second annular window l! A first
annular space I! To which a voice coil (.5 not shown-) is inserted. Ilco] A gap larger than 6 · Ashi,
t. The second, 7 magnet / 41 is magnetized 18 in the opposite direction to the first magnet / l.
This speaker achieves low leakage magnetic flux by eliminating leakage magnetic flux generated
by the first magnet 1 / + 9 by magnetic flux generated by the second magnet / '$: 0 (3). すなわち
、? As shown enlarged in FIG. 3, the second annular gap 'l! Magnetic flux circuit (output line 19)
generated by the second magnet / 47, 1 harmful leaked magnetic flux (denoted by magnetic field
lines / /, · · · ·) generated by the first grinding stone // (Denoted by 7). Therefore, in the case of
this speaker, it is an indispensable element to form the second annular window IIIji / j ′ ′. The
disadvantage of this S + '□ Pika is that the loss of 8 bundles is large, and it is hard! 1111 is that
efficiency is not good.
That is, only the magnetic flux generated in the first annular air gap I3 in which the two voice
coil is disposed is effective, and it is most desirable that all the magnetic force of the magnet 1 be
consumed for this purpose. , And in the case of a speaker, the second annular gap l! Since the
leakage flux 1 'is canceled by eight bundles of another foundation stone on the premise that the
leakage flux 7 is generated, the efficiency is not good in a double sense. Tsumashi, (') EndPage: 2
second magnet / / by the second annular sky 1 / $ tr generate one leakage flux in the circular
ring (/, the second magnet # l L to cancel this leakage flux It is used only as a cane, and it does
not contribute to the intrinsic function of the speaker at all. This loss required this speaker to
have a larger magnet. Therefore, the present invention aims to eliminate the above-mentioned
drawbacks in the conventional loudspeaker and to obtain a loudspeaker free of leakage flux and
having a low loss. The present invention will be described based on FIG. 1 of a crane attached
drawing showing an embodiment thereof. A disk-like base plate λ having an annular first
magnet, and a cylindrical ball portion at the center portion on the lower surface of 2o, has a hole
at the center portion on the ground surface of the magnet core 0 The outside diameter is magnet
co. The top 7 plates λ3 which are larger than the outer diameter of 4 are respectively bonded by
an adhesive, and thereby K forms an air gap Jul for the voice coil between the ball portion 1 and
the hole of the top plate 3 . A second annular magnet core 3 is provided on the bottom surface of
the bottom plate with the magnetization direction reversed from that of the first magnet λO, and
a shield cover 4 is adhered to the bottom surface. The shield cover core 4 has a concave shape
and is connected to the outer peripheral portion of the thin plate core 3 at its soil end. 7 ram a7
is attached to the Tm M m coco ground surface, and voice coils, diaphragms, etc. are placed at
their respective foot positions. Since these arrangements are the same as a normal speaker, the
illustration is omitted. Since the speaker according to the present invention has the abovedescribed configuration, the following effects can be obtained. A magnetic circuit is formed by
the first magnet core O1 bottom plate λa and the top plate 23, and the air gap core (IK magnetic
5L is produced as in the conventional speaker but in the speaker of the present invention, the
second magnet core! , Seal) "cover 24. The top plate 3 and the bottom plate form another
magnetic circuit, which also generates a magnetic flux in the air gap J #. That is, the first magnet
co 0 and the second magnet co!
And are connected in parallel. Both the shield cover λ and the top plate 7 have the same
polarity, and unlike the example shown in FIG. 9, there is no air gap in the middle, so that it is
difficult to generate leakage flux. t *, the first magnet which should be produced if the second
magnet co S does not exist, some leakage flux due to 20 is also canceled and leaked by the
second FII stone cutter which reversely distributes the wedge-like direction The magnetic flux is
very small. Moreover, the decrease of the leakage b magnetic flux not only reduces the loss of the
first magnet 20, but also the second magnet co j effectively acts on the air gap co 9, so that it can
obtain 4 output 'ft more than the conventional speaker Sound pressure level is improved. As an
example, a boundary of J, 2X / lX (OD x ID x thickness, each part) magnet is used as the first
magnet and the second magnet is removed (i.e., a boundary). In the same condition as the
conventional speaker), the magnetic flux f '119g0 Gauss of the air gap was used, but when the
magnet of the same size is used as the second magnet, the pressure of the air gap is The
deviation is less than 00 gauss, and the data has also been improved. This is shown by sound
pressure level as shown in FIG. The broken line indicates the value of the state of the
conventional speaker, and the solid line indicates the value of the speaker of the present
invention. This empire shows that the output has been greatly improved. As apparent from the
above description, according to the present invention, it is possible to obtain a low leakage
magnetic flux type speaker that can be used for an adapter that dislikes leakage magnetic flux
such as a color television without using an expensive alnico magnet. In addition, since the
magnet provided to reduce leakage $ 吃 acts so as to generate effective grinding, the speaker Vi
loss is small, and the book has a greatly improved output. Accordingly, the present invention is
an industrial and non-trivial invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional front view of a conventional
internal magnetic glue speaker, FIG. 2 is a partial sectional front view of a conventional external
magnet type speaker, and FIG. 3 is another conventional external magnet type speaker Figure
941 is a cross-sectional view of the field portion of a conventional speaker using a canceling
magnet, Fig. S EndPage: in 3-;-is an enlarged cross-sectional view of Fig. 9, Fig. 6 FIG. 7 is a front
sectional view of the field portion of the speaker according to the present invention, and FIG. 7 is
a diagram showing sound pressure level against frequency. The first O: first magnet: 21, the pole
portion; the second, the bottom plate; 23, the top plate; · · · Second magnet; roller · shield cover;
core · frame. Patent Assignee: Tozaki Pref., Inc. Figure 2: EndPage: 4
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