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JPS62118699

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DESCRIPTION JPS62118699
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
low-leakage flux type speaker for video equipment using a CRT (cathode ray tube). The distance
between the CRT for a television receiver and the speaker is close due to the arrangement of
speakers on the left and right of the audio multiplex broadcast or stereo broadcast of the prior
art television receiver, and the slimness of the cabinet for the television receiver. In such a
situation, if a normal speaker is used, the electron emitted from the electron gun of the CRT can
be bent by the magnetic field generated by the field unit of the speaker, causing deformation of
the screen, color bleeding, etc. Do. Therefore, in order to solve this problem, there is a low
leakage magnetic flux type speaker, and as a conventional known technique for realizing it, a
structure in which a magnetic circuit is fixed to the inner bottom surface of a deep drawing frame
(eg, Japanese Utility Model Publication No. 62-54343) There was one). Hereinafter, the abovementioned conventional low-leakage flux speaker will be described with reference to the
drawings. FIG. 3 is a half sectional view of a conventional low leakage flux speaker. In FIG. 3, 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 form a magnetic circuit 5 which holds the annular magnet 2 to form an annular magnetic gap
4. A deep drawing frame 6 is formed of a magnetic material and has a bottom surface larger than
the outer diameter 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
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 10 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 via an edge 13 014
is a dust cap for closing the hole of the inner peripheral portion of the diaphragm 12 Al. The
voice coil 10, the voice coil bobbin 9, the damper 11, the diaphragm 12, the edge 13, and the
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dust cap 14 are vibration system components. FIG. 4 is a flux diagram of a conventional low
leakage flux speaker calculated by the finite element method. The operation of the conventional
low leakage magnetic flux type speaker configured as described above will be described. Now, let
us assume that the top plate 3 side of the magnetized annular magnet 2 is N pole and the bottom
plate 1 side is S pole. Therefore, the bottom and side surfaces of the deep drawing frame 6 are
magnetized to the S pole. In this case, as shown in the magnetic flux diagram shown in FIG. 4, the
magnetic flux mostly flows from the top plate 3 through the magnetic gap 4 to the bottom plate
1, but the remaining magnetic flux is the bottom surface of the deep draw diaphragm or Flow
into the side.
Problems to be solved by the invention However, a part of magnetic flux (magnetic flux leaking
from the middle part of the top plate) is low leakage magnetic flux type by roughly turning the
through hole 7 provided on the upper end side of the deep drawing frame 6 and its front surface.
In high-definition television receivers, etc. that are more susceptible to leaked magnetism than
current television receivers, it is easy for color blurring and color deviation to occur, making the
speakers far from the cathode ray tube. And other problems such as the need for other magnetic
shielding measures. The present invention has been made in view of the above-mentioned
problems, and provides a low-leakage magnetic flux type speaker which can be used also in a
high precision television receiver or the like. Means for Solving the Problems In order to achieve
this object, the low leakage flux type loudspeaker of the present invention comprises a magnetic
circuit in which an annular magnetic gap is formed by a top plate and a bottom plate fixed to
upper and lower end faces of one annular magnet. 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, having a bottom surface larger than the outer diameter of the magnetic
circuit, a diaphragm and a damper as vibration system components A magnetic seal plate made
of a magnetic material is provided in the space formed by and the outer peripheral end thereof is
fixed to the bottomed deep drawing frame. According to this configuration, the top plate forming
one magnetic pole of the annular magnet is placed in the bottom plate forming the other
magnetic pole and the bottomed deep drawn frame joined thereto and magnetized to the same
magnetic pole. Leakage flux is generated between the top plate and bottom plate, bottomed deep
draw frame, magnetic seal plate and does not leak to other spaces by surrounding with the
bottom and side and the magnetic seal plate joined to it. become. An embodiment of the present
invention will be described below with reference to the drawings. FIG. 1 is a half sectional view of
the low leakage magnetic flux type speaker of the present invention. In FIG. 1, 16 is a bottom
plate, 16 is an annular magnet, 17 is a top plate, 18 is an annular magnetic gap, 19 is a magnetic
circuit, 20 is a deep drawing frame, 21 is a through hole, 22 is a housing, 23 is a voice A coil
bobbin, 24 is a voice coil, 25 is a damper, 26 is a diaphragm, 27 is an edge, and 28 is a dust cap,
which are the same as in the prior art. A magnetic seal plate 29 made of a magnetic material is
disposed in the space formed by the vibration plate 26 and the damper 26 which are vibration
system components, and the outer peripheral portion thereof is fixed to the deep drawing frame
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2o. The operation of the low leakage magnetic flux type speaker according to the embodiment of
the present invention configured as described above will be described below.
FIG. 2 is a flux diagram of the low leakage flux speaker of FIG. 1 determined by the finite element
method. As described in the prior art, most of the magnetic flux flows from the top plate 17
through the annular magnetic gap 18 to the bottom plate 16, and the magnetic flux at the outer
peripheral portion of the magnet 16 flows into the inner bottom and side walls of the deep
drawing frame 20. The magnetic flux leaking from the middle portion of the top plate 17 flows
into the magnetic seal plate 29 and does not leak to the external space. According to the present
invention, there is provided a magnetic body having a bottom surface larger than the outer
diameter of the magnetic circuit, wherein the back surface of the magnetic circuit forming an
annular magnetic gap with the top plate and the bottom plate fixed to the upper and lower end
faces of one annular magnet. An annular magnetic seal plate made of magnetic material is
provided in a space formed by adhering to the inner bottom surface of a bottomed deep drawn
frame made of By fixing the outer peripheral end to the bottomed deep draw frame, it is possible
to realize a low-leakage flux type speaker which does not cause color blurring or color shift even
in a high definition television receiver.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a half sectional view of a low leakage flux speaker according to an embodiment of the
present invention, FIG. 2 is a flux line diagram of the low leakage flux speaker of FIG. 1, and FIG.
3 is a conventional low leakage flux speaker 4 is a magnetic flux diagram of the low leakage
magnetic flux speaker of FIG.
15 · · · · · · Bottom plate, 16 · · · · · · · · · · · · · · · · · · · · · · · Top plate, 18 · · · · · · · · · · · · · · · · · · · · · · · · · · · ,
2 o ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · magnetic seal plate Name of Agent Attorney Nakao Toshio 1/5-Bottom Play F16--罠 A
(11-2 (Fig. 2 and 3)
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1/--страниц
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