JPS62296699

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DESCRIPTION JPS62296699
[0001]
3, detailed description of the invention T! F, Field of Use on Fire 2 The present invention relates
to a magnetic leakage type speaker for use in a video apparatus using a cathode ray tube CRT. A
television receiver corresponding to the prior art audio multiplex broadcasting and stereo
broadcasting is made, and speakers are arranged on the left and right sides or in a slim cabinet,
and arranged close to a CRT. Under such circumstances, when a normal speaker is used, the
electrons emitted from the electron gun of the CRT by the magnetic field generated by the
speaker's field section can be bent in its orbit, and the screen is deformed. Bleeding of color
occurs. In order to solve this problem, therefore, there is a low magnetic leak type speaker, and
as a conventional known technique for realizing it, there has been a structure in which a
magnetic circuit is fixed to the inner bottom surface of a deep drawing frame. (For example,
Japanese Utility Model Publication No. 62-64343) The above-mentioned conventional magnetic
leakage type loudspeaker will be described with reference to the drawings. FIG. 2 is a half
sectional view of a conventional magnetically leaky loudspeaker. In FIG. 2, 1 is a bottom plate,
2d, an annular magnet, 3 is a top plate, and the bottom plate 1 and l-tublays 1 and 3 hold an
annular magnet 2 to form an annular magnetic gap 4 It will be 5. The reference numeral 6
denotes a deep drawing frame whose bottom surface is the outer shape of the magnetic circuit: a
large and magnetic body, and a through hole 7 is formed on the end of the deep drawing frame.
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 on
which a voice coil 10 is wound is fixed to the top plate 3 via a damper 11 in order to suspend the
voice coil 1 o in the magnetic gap 4. A 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
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configured as described above will be described. The top plate 3 side of the temporarily
magnetized annular magnet 2 is assumed to be N, and the bottom play 1 1 side is assumed to be
an S pole. Therefore, the bottom and the side of the deep drawing frame 6 are imperial to the
south pole. In this case, most of the magnetic flux flows from the top plate 3 through the
magnetic air gap 4 to the bottom bath V- 1, but the remaining magnetic flux flows to the bottom
and side of the deep drawing frame 6. The magnetic flux leaking from the middle part of some of
the top plates, though only 17 the problems to be solved by the invention, is transmitted through
the through hole 7 provided on the upper end side of the deep drawing frame 6 or around the
entire surface thereof. In order to flow into the back and side of the leaky speaker, five color
blurs and color shifts are likely to occur in high-definition television receivers etc. that are more
susceptible to leakage flux than the current television receivers. There are problems such as
fixing the speaker far away from the CRT and requiring other measures against magnetic
shielding.
The present invention has been made in view of the above problems, and provides a low
magnetic leakage type speaker which can be used even in a high definition television receiver at
low cost. In order to solve the problems, to the means 6 for solving the problem, in order to
achieve this object, the low magnetic leakage type speaker of the present invention has an
annular magnetic gap formed by the top plate and the bottom plate fixed to the upper and lower
surfaces of the annular magnet. A housing formed by adhering the back surface of the magnetic
circuit to the inner bottom surface of a bottomed deep drawn frame made of magnetic material
and having a bottom surface larger than the outer shape of the magnetic circuit; And a voice coil
to which a second cylindrical portion having a diameter smaller than that of the first cylindrical
portion coupled to the upper end portion of the first cylindrical portion is coupled, and a
diaphragm and a damper as vibration system components. And an outer peripheral end of the
magnetic shield plate is fixed to the bottomed deep drawn frame, and an inner peripheral
diameter of the magnetic shield plate is surrounded by the second cylindrical portion. The
diameter of the magnetic gap It has become the smaller configuration. Operation According to
the present invention, according to the above-described structure, the knob plate which forms
one magnetic pole of the annular magnet is joined to the bottom plate which forms the other
magnetic pole and the other side of the page 56 without polarity. The magnetic flux leakage is
caused by the top plate and the bottom plate 1, by being surrounded by the inner bottom and
side surfaces of the bottomed deep drawn frame and the magnetic shield plate provided in the
space formed by the diaphragm and the damper. It occurs between the deep deep drawing frame
and the magnetic shield plate and will not leak to other spaces. An embodiment 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 an embodiment of the present invention. In
FIG. 1, 15 is a bottom plate, 16 is an annular magnet, 17 is a top plate, and the bottom plate 16
and the top plate 17 form a magnetic circuit 19 which holds the annular magnet 16 to form an
annular magnetic gap 18 . Reference numeral 20 denotes a deep drawing frame whose bottom
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surface is larger than the outer shape of the magnetic circuit and made of a magnetic material,
and a through hole 21 is formed on the upper end side thereof. The back surface of the magnetic
circuit 19 is fixed to the inner bottom surface of the deep drawing frame 2o. ７ヘー。 A voice
coil bobbin 22 is a case 22 and a cylinder 23 is a voice coil bobbin in which two cylinders having
a large diameter and a large diameter are combined. The voice coil 24 is suspended in the
annular magnetic gap 18. It is fixed to the top plate 17 via the tumbler 26.
A diaphragm 26 has an inner peripheral portion fixed to the voice coil bobbin 23, and an outer
peripheral portion fixed to the deep drawing frame 2o via the edge 27 at 1-. Reference numeral
28 denotes a dust cap for closing the hole in the inner peripheral portion of the diaphragm 26.
These are the same as before. A magnetic shield plate 29 made of a magnetic material is
disposed in the space formed by the diaphragm 26 and the damper 26, and the outer peripheral
portion thereof is fixed to the deep drawing frame 2o. The operation of the low magnetic leakage
type speaker of the present embodiment configured as described above will be described. The
top plate 17 forming one of the poles of the annular magnet 16 is placed in the bottom plate 16
forming the other magnetic pole and the bottomed deep drawn frame 20 joined thereto and
magnetized in the same polarity. On the bottom and side surfaces and a plate extending to the
center from the lower end of the through hole portion of the deep drawing frame 2 o: ,
Leakage flux is the tube plate 17 and the bottom 7 ′ V −) Bottomed deep drawing frame 20. It
occurs between the magnetic shield plates 29 disposed at the center of the lower end of the
through hole of the frame, and does not leak to other spaces. The present invention has a back
surface of a magnetic circuit in which an annular magnetic gap is formed by a top plate fixed to
the upper and lower surfaces of an annular magnet and a bottom plate 1, and has a bottom
surface larger than the outer shape of the magnetic circuit. And a housing formed by being fixed
to the inner bottom surface of a bottomed deep drawn frame made of magnetic material, and a
lower end of a through hole of the frame in a space formed by a diaphragm made of vibration
system components and a damper The arrangement of the magnetic shield plate extended
around the center can realize a low magnetic leakage type speaker in which color bleeding or
color deviation hardly occurs even in a high definition television receiver. Furthermore, in the 9page / voice coil bobbin having a configuration in which two cylinders having different diameters
are combined, the inner peripheral portion of the magnetic shield plate is an annular magnetic
gap because a portion of the bobbin is smaller than the diameter of the voice coil portion. It is
possible to make it smaller than the diameter of the above and to cover the upper side of the
annular magnetic gap. Compared with the conventional low magnetic leakage type speaker
which prevents the magnetic leakage on the back and side of the prior art, there is an advantage
that the magnetic leakage in the front direction of the Besby force can be prevented and the
restriction on the arrangement of the speaker is eliminated.
[0002]
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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, and FIG. 2 is a half sectional view of a conventional low magnetic leak type
speaker.
15 · · · · · · Bottom plate, 16 · · · · · · · · · · · · · · · · · · · · · Top plate, 18 · · · · · · · · · · · · · · · · · · · · · · 20
Deep-drawing frame 21 Through-hole 22 Casing 23 Voice-coil bobbin 24 Voice Coils 26 26
Dampers 26 Diaphragms 27 Edges 28 Dust caps 29 Magnetic shields 10 bases Board. Name of
agent Attorney Nakao Toshio and 1 other person Fig. 15-One year old J. Tom Bl,-) / b-Annular
procedure entry procedure correction (Form type% formula% ■ Display of case Stomach Patent
No. 14'O End 9C2 Patent application Invention name Low magnetism leakage Speaker 3 Person
who makes corrections Special case Application place Gakushin City Ogata Kamonshin 1006
Name Osaka Prefecture (582) Matsushita Electric Industrial Co., Ltd. Representative person Akira
Akira 4 agent 〒 571 housing place Osaka Prefecture Kadoma city Oji Kamon 1006: Matsushita
Electric Industrial Co., Ltd.
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