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JPS6343498

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DESCRIPTION JPS6343498
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
low magnetic leakage type speaker used for video equipment and the like using a cathode ray
tube (CRT). The television receiver corresponding to the conventional technology audio multiplex
broadcasting and stereo broadcasting is made, and the speakers are arranged on the left and
right, or the slim cabinet (Cabi Neno), but the speakers are arranged close to the CRT. Under such
circumstances, when a normal speaker is used, the electron emitted from the electron gun of the
CRT can be bent in its orbit by the magnetic field generated by the speaker's field section.
Deformation or color bleeding occurs. Therefore, in order to solve this problem, there has been a
low magnetic leakage type speaker (for example, Japanese Utility Model Publication No. 5254343) in which a magnetic circuit is fixed to the inner bottom surface of the deep drawing
frame. Hereinafter, the above-described conventional low magnetic leakage type speaker will be
described with reference to the drawings. FIG. 6 is a half sectional view of a conventional low
magnetic leakage type speaker. In FIG. 6, 1 is a bottom plate, 2 is an annular magnet, 3 is a top
plate, and the bottom plate 1 and the top plate 3 hold the annular magnet 2 to form an annular
magnetic gap 4 It becomes. Reference numeral 6 denotes a deep drawn frame whose bottom is a
dog and made of a magnetic material than the outer shape of the magnetic circuit, and a through
hole 7 is formed on the upper end side thereof. The back surface of the magnetic circuit 5 is
fixed to the inner bottom surface of the deep drawing frame 6. The housing 8 is formed by the
above configuration. A voice coil bobbin 9 having a voice coil 1o wound thereon is fixed to the
top plate 3 via a damper 11 in order to suspend the voice coil 10 in the magnetic gap 4. The
diaphragm 12 has an inner peripheral portion fixed to the voice coil bobbin 9 and an outer
peripheral portion fixed to the frame 6 through an edge 13. Reference numeral 14 denotes a
dust cap for closing the hole in the inner peripheral portion of the diaphragm 12. The operation
of the conventional low magnetic leakage type speaker configured as described above will be
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described. Let the top plate 3 side of the annular magnet 2 that has been temporarily magnetized
be an N pole, and let the bottom plate 1 side be an S pole. Therefore, the bottom surface and the
side surface of the deep drawing frame 6 are magnetized to the S pole. In this case, most of the
magnetic flux flows from the top plate 3 through the magnetic gap 4 to the bottom plate 1, but
the remaining magnetic flux flows into the bottom or side of the deep drawing frame 6. However,
the magnetic flux leaking from the middle part of some of the top grays 1 and 2 around the
through hole 7 provided on the upper end side of the deep drawing frame e and the entire
surface thereof is a low magnetic leak type speaker In high-definition television receivers, etc.,
which are more susceptible to leakage flux than current television receivers, color bleeding and
color deviation are likely to occur, and the speaker is far from the CRT. There are problems such
as separation and fixing, and the need for other magnetic shielding measures.
The present invention has been made in view of the above problems, and provides a low
magnetic leakage type speaker that can be used even in a high definition television receiver at
low cost. Means for Solving the Problem In order to achieve this object, the low magnetic leakage
type speaker of the present invention forms an annular magnetic gap with a top plate and a
bottom plate fixed to the upper and lower surfaces of one annular magnet. A magnetic circuit,
and a case having a bottom surface larger than the outer shape of the magnetic circuit, and a
housing formed by securing the back surface of the magnetic circuit to the inner bottom surface
of a bottomed deep drawn frame made of magnetic material A shield cover made of a magnetic
material, in which thin films of ferromagnetic material are formed on both sides of plastic, and
the shield cover is formed into a rotating body whose cross section is an elongated circle whose
diameter decreases in the radial direction of the diaphragm. It has become. Operation According
to the present invention, according to the configuration described above, the top plate forming
one magnetic pole of the annular magnet, the bottom grate forming the other magnetic pole, and
the bottomed joint joined thereto and magnetized to the same polarity By enclosing the inner
bottom and sides of the deep draw frame with a magnetic shield cover made of ferromagnetic
material, the magnetic flux leaking to the outside of the deep draw frame with a bottom is
blocked by the cover, and to other spaces Will not leak out. Also, by using a ferromagnetic body
as a rotor whose cross section is an oval whose diameter decreases in the radial direction of the
diaphragm that approximates the shape of the shield cover to an equal flux surface with equal
leakage flux density, leakage flux due to remagnetization Will not occur. In addition, since a thin
film of ferromagnetic material is formed on both sides of the plastic, it is shielded by a twolayered shield, and the shielding effect is enhanced. Examples of the present invention will be
described below with reference to the drawings. FIG. 1 is a half sectional view of a low magnetic
leakage type speaker according to a first embodiment of the present invention. In FIG. 1, 16 is a
bottom plate, 16 is an annular magnet, 17 is a top plate, and the bottom plate 16 and the top
plate 17 hold the annular magnet 16 to form an annular magnetic gap 18 It becomes. Reference
numeral 2o denotes a deep drawing frame having a bottom surface larger than the outer shape
of the magnetic circuit 19 and made of a magnetic material, and a through hole 21 is formed on
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the upper end side. The back surface of the magnetic circuit 19 is fixed to the inner bottom
surface of the deep drawing frame 20. A voice coil bobbin 22 is a body, and 23 is a voice coil
bobbin obtained by combining two cylinders having two large and small diameters with a large
diameter of a cylindrical portion around which the voice coil 24 is wound. 25 is fixed to the top
plate 17 via 25.
A diaphragm 26 has an inner peripheral portion fixed to the voice coil bobbin 23, and an outer
peripheral portion fixed to the frame 20 via an edge 27. Reference numeral 28 denotes a dust
cap which closes the hole on the inner peripheral portion of the diaphragm 28. These are the
same as before. Reference numeral 29 denotes a magnetic shield cover made of a magnetic
material, in which thin films 34 of ferromagnetic material are formed on both sides of the plastic
33 and disposed on the outer periphery of a deep drawn frame with a spacer 30 formed of
paramagnetic material. There is. The shape of the cover is a rotating body whose cross section is
an elongated circle whose diameter decreases in the radial direction of the diaphragm, and
approximates equal flux lines of the speaker leakage flux. As the plastic 33, ABS resin, vinyl
chloride resin or the like is preferable, and its surface activation treatment is applied to form a
thin film 34 of ferromagnetic material such as nickel or iron. The operation of the low magnetic
leakage type speaker of this embodiment configured as described above will be described. One
back surface of the magnetic circuit 19 forming an annular magnetic gap with the top plate 17
and the bottom plate i 16 fixed to the upper and lower surfaces of the annular magnetor has a
bottom surface larger than the outer shape of the magnetic circuit 19; And, the leakage flux
density of the speaker consisting of the housing 22 formed by being fixed to the inner bottom
surface of the bottomed deep drawing frame 20 made of magnetic material is as shown in FIG.
That is, the circled line W shows an equal flux density of 0.6 gauss. Similarly, a dotted line X
indicates 0.9 gauss, an alternate long and short dash line Y indicates 1.5 gauss, and a crosshatched line Z indicates 1.8 gauss. The leakage flux density outside the frame is low in the lateral
direction of the frame and high in the downward direction. For this reason, at points A and B
equidistant from the frame, 1.8 gauss and 20 gauss are largely different. Therefore, when a
shield cover connecting point A to point B as shown in FIG. 2 is disposed, the shield cover is
magnetized by the magnetic potential difference from point B to point A, and the leakage flux as
shown by a dotted line In this example, the shield is a rotating body whose cross section is an
oval that decreases in diameter in the radial direction of the diaphragm along the isomagnetic
flux surface from point A to point C. The shield cover is hardly magnetized because there is no
magnetic potential difference on the cover. Therefore, the leakage flux that leaks to the outside of
the bottomed deep drawing frame is shielded by the shield cover, so it does not leak to other
spaces. Moreover, since the magnetic material is a thin film of ferromagnetic material formed on
both sides of plastic, it is shielded by a two-layer shield, and the shielding effect is enhanced.
In addition, although it was set as the speaker using a bottomed deep-diaphragm frame as a spill
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force inside a shield cover, as shown in FIG. 3, the low magnetic leak which has the opposing
magnet type magnetic circuit 31 which made two magnetic circuits oppose. The back surface of
the magnetic circuit 19 in which the annular magnetic gap 18 is formed by the top plate 17 and
the bottom plate 16 fixed to the top and bottom surfaces of the ring magnet 16 and the speaker
shown in FIG. The magnetic body is formed in the space formed by the casing 22, the diaphragm
26, and the damper 26, which has a larger bottom surface and is fixed to the inner bottom
surface of the bottomed deep drawing frame 2Q made of magnetic material. The speaker may be
provided with an annular magnetic shield plate 32 formed of an annular magnetic shield. As
described above, according to the present invention, there is provided a magnetic circuit in which
an annular magnetic gap is formed by the top plate and the bottom plate fixed to the upper and
lower surfaces of the annular magnet, and a bottom surface larger than the outer shape of the
magnetic circuit. And a housing formed by fixing the back surface of the magnetic circuit to the
inner bottom surface of a bottomed deep drawn frame made of magnetic material, and a thin film
of ferromagnetic material is formed on both sides of the plastic on the outer peripheral portion of
the housing. Providing a shield cover made of a magnetic material, and forming the shield cover
into a rotating body whose cross section is an elongated circle whose diameter decreases in the
radial direction of the diaphragm, a high definition television It is possible to realize a low
magnetic leakage type speaker in which color bleeding and color deviation are unlikely to occur
even in an image receiver.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a half sectional view of a low magnetic leak type speaker according to an embodiment of
the present invention, FIG. 2 is a half sectional view showing the shape of a magnetic shield cover
in which ferromagnetic thin films are formed on both sides of plastic 3 and 4 are half sectional
views showing a low magnetic leakage type speaker according to another embodiment of the
present invention, FIG. 5 is a half sectional view of a conventional low magnetic leakage type
speaker, and FIG. It is a leakage flux density distribution map of a leakage type speaker.
16 ...... bottom plate, 1Shita ...... ring magnet, 17 ...... top plate, 18 ...... annular magnetic gap, 19
...... magnetic circuit , 20 ..... bottomed deep drawing frame, 21 ..... through hole, 22 .. ... frame, 23
..... voice coil, 24 .. ..... Voice coil bobbin 26 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · dust
cap, 29 · · · · · · magnetic shield Cover, 30 ... Space? -· · · · · · · · · · Facing magnet type magnetic
circuit, 32 · · · · annular magnetic shield plate, 33 · · · · · · · · · · · · · · · · · · · · · · · · · · ferromagnetic thin
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film. 15-Bottom stop 16 ·-j! Hayashi mage sweat 7-17--top plate 18-scaly fiery two-peak knee
magnetic circuit 24- voice filpobin 25--dampa-intimidation I F lt, 贋 ぼ)
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