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JPH0619397

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0619397
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
novel speaker of the type in which a compensating permanent magnet called a canceling magnet
is provided to suppress magnetic leakage.
[0002]
More specifically, it is not specially manufactured as a permanent magnet for compensation, but
cost reduction is realized by diverting an annular permanent magnet used for generating
magnetic flux of an external magnet type speaker as it is to a permanent magnet for
compensation. And correct alignment between the bottom yoke on which the permanent magnet
for generating magnetic flux is attached and the permanent magnet for compensation to improve
the cancellation effect of the leakage flux by the permanent magnet for compensation It is an
attempt to provide a new speaker that
[0003]
BACKGROUND OF THE INVENTION In external magnet type loudspeakers, there has been an
attempt to use a compensating permanent magnet called "cancel magnet" to shield the leakage
flux from the outside, and it is widely used.
[0004]
FIGS. 4 and 5 show an example of a speaker using such a compensating permanent magnet, and
FIG. 4 is a diagram of Japanese Patent Publication No. 37-10721, and FIG. 5 is a summary of
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Japanese Patent Publication No. 37-10722. Each is described.
[0005]
That is, in each of FIGS. 4 and 5, in addition to the permanent magnet a for generating magnetic
flux, a compensation permanent magnet c is provided in the vicinity of the yoke plate b.
[0006]
When the compensation permanent magnet c is used to cancel the leakage flux as described
above, if the center of the compensation permanent magnet c and the center of the magnetic flux
generation permanent magnet a deviate from each other. The balance of the magnetic flux
leaking from the permanent magnets a and c is lost, and a phenomenon occurs in which the
permanent magnet a wins in one direction and the permanent magnet c wins in another
direction, and even a harmful leakage flux may be generated. .
[0007]
Therefore, as means for accurately aligning the permanent magnets for magnetic flux generation
and the permanent magnets for compensation, those shown in FIGS. 6 and 7 have been
proposed.
6 is disclosed in JP-A-52-6521, and FIG. 7 is disclosed in JP-A-52-7625.
[0008]
In these loudspeakers, a positioning ring d, e (in FIG. 6) or f, g, h (in FIG. 7) is used to generate a
magnetic flux generating permanent magnet i and a compensating permanent magnet j. The
position between the and is made to be accurate.
[0009]
There is also one as shown in FIG.
[0010]
This is an annular permanent magnet k used as an external permanent magnet speaker as a
permanent magnet for compensation as it is, and this k is disposed on the back side of the
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bottom yoke 1
[0011]
However, even in the loudspeakers shown in FIGS. 6 and 7, a large number of positioning rings
are required for alignment between the permanent magnets i and j. As the number of parts
increases, a disk-shaped permanent magnet j used as a permanent magnet for compensation
must be specially made, which inevitably increases the cost.
[0012]
Further, in the loudspeaker shown in FIG. 8, since the annular permanent magnet k is used as the
compensation permanent magnet, the permanent magnet for generating magnetic flux of the
external magnet type loudspeaker can be diverted as it is, which is costly. Can be significantly
reduced.
[0013]
However, the bottom yoke 1 is provided with a depression in the front of the central portion
thereof, which is recessed with respect to the front in order to take a sufficient moving stroke of
the voice coil, and accordingly, on the rear surface of the central portion of the bottom yoke l.
Has a frusto-conical protrusion, and the so-called sitting position between the compensation
permanent magnet k and the bottom yoke 1 is poor, and it is difficult to accurately align the
mutual, and when fixing both by bonding There is a problem that a large bonding margin (white)
can not be obtained, the fixed state becomes unstable, and the bottom yoke 1 and the
compensating permanent magnet k may be separated by a small impact.
[0014]
[Means for Solving the Problems] Therefore, in order to solve the problems described above,
according to the speaker of the present invention, an annular first permanent magnet coaxial
with the bottom yoke is provided on the front surface of the disk-shaped bottom yoke. Attached,
an annular second permanent magnet is disposed behind the bottom yoke, and an annular spacer
is interposed between the bottom yoke and the second permanent magnet, and the front surface
of the outer periphery of the spacer is disposed An annular flange projecting forward and having
an inner diameter equal to the outer diameter of the bottom yoke, and an annular flange
projecting backward on the rear surface and having an inner diameter equal to the outer
diameter of the second permanent magnet are coaxially formed. And the first yoke is fitted inside
the annular flange on the front side of the spacer and the second permanent magnet is fitted
inside the annular flange on the rear side of the spacer. With permanent magnets And second
permanent magnet is characterized in that so as to be coaxially disposed.
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[0015]
[Function] Therefore, according to the speaker of the present invention, since it is possible to
divert an annular permanent magnet which is used as a permanent magnet for generating
magnetic flux of an external magnet type speaker as a permanent magnet for compensation, it is
possible to The cost can be significantly reduced as compared to that of the first one, and the
presence of the spacer enables accurate alignment between the bottom yoke supporting the
permanent magnet for generating magnetic flux and the compensating permanent magnet.
Therefore, cancellation of the leakage flux by the compensating permanent magnet is efficiently
performed, and the magnetic shield to the outside can be surely performed.
[0016]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the details of the
speaker of the present invention will be described according to the embodiment shown in the
attached drawings.
[0017]
The loudspeaker 1 comprises a loudspeaker main part 2 and a magnetic shield part 3.
[0018]
Reference numeral 4 denotes a flat diaphragm, which has a circular or square front shape.
The peripheral portion of the diaphragm 4 is supported by the front opening 6 of the frame 5 via
an edge 7
[0019]
The voice coil bobbin 8 has its tip fixed to the center of the back surface of the diaphragm 4 by
bonding or the like.
Also, a voice coil 9 is wound around a portion near the rear end of the voice coil bobbin 8.
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[0020]
A plate 10 has an annular shape with an insertion hole 11 formed at the center and is fixed to
the rear opening 13 of the frame 5 by means of mounting screws 12, 12,.
[0021]
Reference numeral 14 denotes an annular permanent magnet for generating magnetic flux,
which is fixed to the rear surface of the plate 10
[0022]
The reference numeral 15 designates a disk-shaped bottom yoke, and a substantially truncated
cone-shaped depression 16 is formed at the center of the front surface, and the formation of the
depression 16 causes the bottom yoke 15 to be formed. A truncated cone shaped projection 17 is
formed on the back of the lens.
The bottom yoke 15 is fixed to the back surface of the permanent magnet 14 so as to be coaxial
with the permanent magnet 14.
[0023]
Reference numeral 18 denotes a pole piece, the rear end of which is fixed to the central part of
the depression 16 of the bottom yoke 15, and the front end is located at the central part of the
insertion hole 11 of the plate 10. A gap 19 is formed as a gap 19 in which the voice coil 9 is
positioned in a freely movable state.
[0024]
A damper 20 is connected between the frame 5 and the voice coil bobbin 8 and supports the
voice coil bobbin 8 on the frame 5.
[0025]
The magnetic shield 3 comprises a shield cover 21, a compensating permanent magnet 22 and a
spacer 23.
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[0026]
The shield cover 21 has a deep bowl shape, and a central hole 24 is formed at the center of the
bottom of the shield cover 21. An annular rim projecting forward from the opening edge of the
central hole 24 is formed. The rim 25 is formed.
[0027]
The compensation permanent magnet 22 is a permanent magnet for generating magnetic flux,
and has a ring shape.
The outer diameter of the flange 25 formed on the shield cover 21 is substantially equal to the
inner diameter of the compensating permanent magnet 22, and the flange 25 is fitted into the
compensating permanent magnet 22, whereby The compensation permanent magnet 22 and the
shield cover 21 are positioned, and the compensation permanent magnet 22 is adhesively fixed
to the bottom front surface of the shield cover 21.
[0028]
The spacer 23 is formed of a synthetic resin and has an annular shape as a whole, and from the
outer peripheral edge thereof, an annular flange 26 on the front side projecting forward and a
rear side projecting rearward The annular flanges 27 of each are integrally formed.
[0029]
The inner diameter of the front annular flange 26 is equal to the outer diameter of the bottom
yoke 15, and the inner diameter of the rear annular flange 27 is equal to the outer diameter of
the compensating permanent magnet 22.
[0030]
The bottom yoke 15 is fitted on the annular flange 26 on the front side of the spacer 23 so that
the rear surface of the bottom yoke 15 is adhesively fixed to the front surface of the spacer 23.
Further, the compensation permanent magnet 22 is fitted into the annular flange 27 on the rear
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side of the spacer 23 in a form of an inner fitting, and the front surface of the compensation
permanent magnet 22 is fixed to the rear surface of the spacer 23 by adhesion.
[0031]
In the speaker 1 described above, the spacer 23 is accurately positioned between the
compensation permanent magnet 22 by the annular flange 27 on the rear side, and through the
spacer 23 by the annular flange 26 on the front side. Thus, the bottom yoke 15 and the
compensating permanent magnet 22 are accurately positioned.
[0032]
Since the permanent magnet 14 for magnetic flux generation is accurately positioned with
respect to the bottom yoke 15, the distance between the permanent magnet 14 for magnetic flux
generation and the compensation permanent magnet 22 is accurate after all. It will be positioned
at
[0033]
Therefore, the permanent magnet manufactured as a permanent magnet for magnetic flux
generation is used as it is as a permanent magnet for compensation, and the positioning between
the permanent magnet for magnetic flux generation and the permanent magnet for
compensation is suppressed while the manufacturing cost is kept low. The effect is that the effect
of leakage flux cancellation can be sufficiently cited.
[0034]
As is apparent from the above description, in the loudspeaker according to the present invention,
an annular first permanent magnet is attached to the front of the disk-shaped bottom yoke
coaxially with the bottom yoke, An annular second permanent magnet is disposed behind the
bottom yoke, an annular spacer is interposed between the bottom yoke and the second
permanent magnet, and a front surface of the outer periphery of the spacer is directed forward
An annular flange having an inner diameter equal to the outer diameter of the bottom yoke, and
an annular flange coaxially formed on the rear surface and projecting rearward and having an
inner diameter equal to the outer diameter of the second permanent magnet; The first permanent
magnet is fitted by the bottom yoke being fitted inside the annular flange on the front side of the
spacer and the second permanent magnet being fitted inside the annular flange on the rear side
of the spacer And the second permanent And stones is characterized in that so as to be coaxially
disposed.
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[0035]
Therefore, according to the speaker of the present invention, since the annular permanent
magnet used as the permanent magnet for generating the magnetic flux of the external magnet
type speaker as the permanent magnet for compensation can be diverted as it is, In comparison,
the cost can be significantly reduced, and the presence of the spacer enables accurate alignment
between the bottom yoke supporting the permanent magnet for generating magnetic flux and the
compensating permanent magnet. It is possible to cancel out the leakage flux efficiently by the
permanent magnet and ensure the magnetic shield to the outside.
[0036]
The specific configuration shown in the above embodiment is merely an example of the
implementation of the speaker according to the present invention, and the technical scope of the
present invention can be interpreted limitedly by these. It does not.
[0037]
Brief description of the drawings
[0038]
1 is an exploded vertical sectional view showing an example of the implementation of the present
invention speaker.
[0039]
2 is a longitudinal sectional view.
[0040]
3 is a cross-sectional view taken along the line III-III in FIG.
[0041]
4 is a longitudinal sectional view showing an example of a conventional speaker.
[0042]
5 is a longitudinal sectional view showing another example of the conventional speaker.
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[0043]
6 is a longitudinal sectional view showing still another example of the conventional speaker.
[0044]
7 is a longitudinal sectional view showing still another example of the conventional speaker.
[0045]
8 is a longitudinal sectional view showing an essential part of another example of the
conventional speaker.
[0046]
Explanation of sign
[0047]
1 Speaker 14 first permanent magnet 15 bottom yoke 22 second permanent magnet 23 spacer
26 front annular flange 27 rear flange
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