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JPS5769378

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DESCRIPTION JPS5769378
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view showing an
example of the magnetic circuit of a conventional coaxial speaker, FIG. 2 is a schematic
perspective view showing another example as well, and FIG. 3 relates to this invention. A
schematic perspective view showing one embodiment of the speaker, FIG. 4A is a schematic cross
sectional view for explaining a part of the speaker of FIG. 3, and FIG. 4 explains an essential part
of the speaker of FIG. 1 is a schematic cross-sectional view of FIG. 35, 36: Diaphragm, 71: First
yoke, 72: Permanent magnet, 73: Pole piece, 74: Pole piece and plate, 75: Plate, 76・
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a speaker, and more
particularly to the improvement of the speaker's magnetic circuit. 1 and 2 are schematic crosssectional views schematically showing a magnetic circuit portion of a coaxial speaker in which a
plurality of diaphragms are coaxially arranged. 'Nearly shown in figure 1' 2, T ';' one is
configured to drive two diaphragms with one magnet. In the figure, 11 is a yoke, 12 is a
permanent magnet, 13 is a pole piece, 14 is a plate, 15 is a bobbin connected to a diaphragm
(not shown) for reproduction of middle or high-pitched sound, for example. For example, a
bobbin connected to a diaphragm (not shown in FIG. 1) for low-pitched sound reproduction, and
17.18 are discoils wound around the bobbin 15.16. In the case of the illustrated configuration, it
is possible to obtain a sufficient magnetic flux interception for driving the oscillating plate
connected to the bobbin 15, but for the vibrating plate connected to the bobbin 16 It is not
possible to obtain a sufficient magnetic flux density to drive the The one shown in FIG. 2 is
configured to drive one diaphragm with a permanent magnet. In 1 gl, 21 is a yoke, 22.23.24 is a
permanent magnet, 25 pole piece and plate, 26. 27 is a bobbin connected to, for example, a
diaphragm for high-pitched sound reproduction and a diaphragm for low-pitched sound
reproduction, 28 .29 is a pois coil. The permanent magnet 24 is shown in the figure: Na. It is a
permanent 磁石 magnet for driving an imaging plate for reproducing low-pitched sound. Since
the imaging plate of Ii 241 is driven by two permanent magnets in the configuration as shown in
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the figure, there is a disadvantage that the manufacturing cost increases as the shape of the
speaker becomes large. This old plan was made to cope with the situation of the soil St, and it is
possible to drive two diaphragms by one magnet with a single magnet, and coaxial type which
can reduce the small ring 1 and the manufacturing cost. The purpose is to provide a speaker.
Hereinafter, an embodiment of the present invention will be described in detail with reference to
the drawings. FIG. 3 is a schematic oblique view of a coaxial speaker in which a plurality of
moving plates having different outer peripheral lengths are coaxially arranged, and for example,
three diaphragms for bass reproduction, middle tone reproduction, and high tone reproduction
are arranged. It is by setting. In the figure, 31 is a support plate for supporting the magnetic
four-way part of the speaker, 32 is a frame, 33 is a leg for fixing the frame to the support plate
32, a diaphragm for 34-bass sound reproduction, 35 The diaphragm for sound reproduction is a
diaphragm for high-pitched sound reproduction. The fourth ring (&), (b) is a schematic crosssectional view of the third M speaker. Fig. 4 (&) shows the magnetic circuit etc. for driving the
diaphragm 34.35 in cross section, and only the magnetic circuit for driving the movable plate
flow shown in Fig. 4 (b). Shown in cross section.
a4 Ltl (a), screws 37 for fixing the leg 33 to the support plate 31; ? It is a screw for removing the
Jif rate 32 into the leg 33 one piece. 39 ° 40.41 is the outer peripheral edge of the diaphragm
34.35.36, 42, 4, V and 44 are the diaphragm, respectively? 4、35.、? It is the inner
circumference edge of 6. The outer edge 39 is fixed to the frame 32 and is fixed to the inner edge
42 and the outer, outer frame 40 support 45, the inner edge 43 and the outer edge 41 are fixed
to the support 46, and the inner edge 44 is supported It is fixed on the body 47. 48.49.50 is the
diaphragm, respectively? 4、35、;? The bobbins connected to six, 51, 52. 53, are each bin
48 ° 4y, so K coupons pois carp A /, 54155. 56 or so decal 4F 1.49. Dan p + for SO, s7 is a
support of Dan-4'54. Here, vibration N for bass reproduction,? In the case of the magnetic circuit
of No. 4, 581 dimension permanent magnet, 59 is a yoke, 60 is a pole piece, 61 is a top plate. 62
is a member for separating the yoke 59 from the support plate 31 by a distance, 63 is a screw
for fixing the yoke 59 to the support plate 31, and identifies a single piece 6 o with the 64 yoke
59. It is a screw for. Next, we will use the 41 + 21 (b) to highlight the @ -signature portion of this
invention. 71 is a first yoke, 72 permanent magnet, 73 pole piece, 74 (叶 pole piece and plate, 75
is a plate, 76 is a second yoke, 77 is a first yoke 7) fixed to the support plate 31 Screw 78 for
fixing the pole piece 73 to the first yoke 71 79 for fixing the second yoke 76 to the first yoke 71
80d second yoke 76 for the play door It is a screw which fixes five. A through hole 81 is formed
in the direction connecting the two magnetic poles substantially at the center of the magnetic
pole surface of the front ii7 * permanent magnet 72 # i, and the pole piece 73 is disposed here.
The pole piece wart plate 74 is cast on the upper surface of the permanent magnet 22 so as to
surround the outer circular surface of the pole piece 73. The upper end portion outer peripheral
surface of the pole piece 73 and the upper end portion inner peripheral surface of the front piece
rigid plate 74 are close to each other, and a voice coil 53 wound by Qi + t "+ f bin so K is
disposed in this space. ing. The yoke 76 of the weir 2 is positioned to surround the outer circular
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surface of the forearm permanent magnet 72 at the inside upper surface of the first yoke 71.
The foreword 176 rate 75 is designed to surround the outer peripheral surface of the permanent
magnet 72 and the hip pole bead and plate 74 at the upper surface of the second yoke 76 in the
drawing. In this case, the inner peripheral surface of the upper end portion of the plate 75 is
brought close to the outer peripheral surface of the pole piece wart plate 74, and the abovementioned gap in the air gap is? An iron coil 52 wound around a bin 49 is disposed. In the tenth
F configuration, a first magnetic circuit is constituted by the first yoke 7, the pole ruby suff 3 and
the pole piece and plate 74, and the yoke 71 of the chiku 1, the pole piece and plate 74, the play)
75, The two yokes 76 constitute a glossy 2 magnetic circuit. Then, assuming that the condition of
the permanent magnet 72 is, for example, as shown in the drawing, a magnetic path is formed in
the direction of the arrow xi in the direction of the arrow and in the direction of the drawing 8)
X2. As a plate for the magnetic path in the direction of this arrow, pole piece and great 74 mark I
arrow Xt shown, arrow X? It acts as a pole piece [7] for the magnetic path in the direction. Then,
the vibration plate 36 is driven by the magnetic flux generated along the direction of the arrow
X1 indicated by the arrow 1! The diaphragm 35 is driven by the magnetic flux generated along
the direction. According to this embodiment described above, the following effects can be
obtained. Since one permanent magnet 72 can drive the diaphragm of 2-, 95, J6, it is possible to
achieve the conversion of wood of Subika and the reduction of the manufacturing cost. Further, a
through hole 80 is formed in a substantially central portion of the permanent magnet 72, and a
magnetic -1 path for driving one swing plate 36 is formed in the through hole 819111, and an
outer peripheral side of the permanent magnet 72 is formed. Since the magnetic path is formed
to make the other moving gear 35 smart, the magnetic flux generated from the permanent
magnet 72 can be efficiently used. Therefore, even with one permanent magnet 72, the
diaphragms 35,. 16 is sufficiently efficient. In such a configuration, the mace coil S2, 5:? It is
possible to obtain more than l4000 gauss of magnetic flux density in the air gap where 1 is
installed. The present invention is not limited to the above embodiment. For example, in the
previous embodiment, the present invention is applied to the magnetic circuit of the innermost
diaphragm 36 and the image pickup & 35 adjacent to the diaphragm 36, but the case of death is
not limited to this. It may be implemented as a magnetic circuit. In this case, what has a through
hole at the central part of the 4-ruby scuff 3 may be used, and a magnet 1iil path dedicated to
the inner periphery 11111K imaging plate 36 may be provided.
In addition, all the diaphragms are not limited to coaxially disposed ones, but the first one. The
1st driven by the magnetic flux which follows a 2nd magnetic flux circuit. Only the second swing
sleeve may be coaxially disposed. As described above, according to this model, it is possible to
drive two diaphragms sufficiently by one magnet, and to provide a 71-axis speaker with a size
reduction and a low manufacturing cost. be able to.
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