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DESCRIPTION JPH067396

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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
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DESCRIPTION JPH067396
[0001]
BACKGROUND OF THE INVENTION The present invention uses one magnet and magnetic gaps
are formed at two places in a magnetic path, and the two magnetic gaps are formed above and
below a single bobbin. The present invention relates to improvement of a magnetic circuit
portion in a speaker in which symmetrically divided and wound voice coils are arranged.
[0002]
2. Description of the Related Art Conventionally, the increase in the impedance of the voice coil
in the high region is suppressed to prevent the decrease in efficiency of the high-pitched part,
and the non-linearity of the drive system is canceled to suppress the distortion of the reproduced
sound. As shown in FIG. 5 and described in Japanese Utility Model Application Laid-Open No. 6323896, for the purpose of obtaining the left and right sum signal reproduction sound in the
ultra-low range in stereo by means of simple means. A magnetic gap is formed in the upper and
lower portions of the center pole 24 by the upper plate 21 and the lower plate 22 fixed to the
upper surface and the lower surface of the magnet 23 using one magnet 23, and the two
magnetic gaps are formed. A speaker having voice coils 28 and 29 arranged symmetrically on
the top and bottom of a single bobbin 27 has been put to practical use. In FIG. 5, 31 is a
diaphragm, 32 is a frame for holding a diaphragm or the like, 33 is an edge of the diaphragm,
and 35 is a damper.
[0003]
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1
[0003] The conventional speaker having such a structure has a structure in which the upper
plate 21 and the lower plate 22 and the center pole 24 are held concentrically at the bottom of
the magnetic circuit. Problem because the yoke 30 fixed across both the lower plate 22 and the
center pole 24 is used, so that the magnetic circuit portion becomes heavy and large.
[0004]
Therefore, the present invention solves the disadvantages of the prior art and reduces the
thickness after assembly by directly supporting the center pole by the joint from the magnet
sandwiched between the upper and lower plates. It aims at providing a speaker of a multiple
voice coil.
[0005]
SUMMARY OF THE INVENTION A speaker according to the present invention for achieving the
above object will be described with reference to FIGS. 1 to 3 showing an embodiment. Magnetic
gaps 5 and 6 are formed symmetrically above and below the center pole 4 by the upper plate 1
and the lower plate 2 fixed to the upper and lower surfaces of the magnet 3, and at one end of
the upper and lower magnetic gaps 5 and 6. A speaker comprising voice coils 8 and 9
symmetrically arranged at upper and lower portions of a single bobbin 7 to which a diaphragm
15 is coupled, which is a speaker of the voice coils 8 and 9 of the bobbin 7 A plurality of slits or
windows 10 are formed at a plurality of locations between the two, and a plurality of
nonmagnetic materials for holding the center pole 4 concentrically with respect to the magnet 3
and the upper plate 1 and the lower plate 2 Joint 11 is a speaker, characterized in that it is
arranged straddling the inner peripheral surface and outer peripheral surface of the center pole
4 of the magnet 3 through the slit 10.
[0006]
Further, in the second invention whose cross section is shown in FIG. 4, a ring-shaped yoke 14 is
disposed outside the upper pole 12 and the lower pole 13 fixed to the upper and lower surfaces
of the magnet 3. Magnetic gaps 5 and 6 are formed symmetrically above and below the yoke 14
by the inner circumferential surface and the outer surface of the upper pole 12 and the lower
pole 13, and the diaphragm 15 is attached to one end of the upper and lower magnetic gaps 5
and 6 In a speaker in which voice coils 8 and 9 symmetrically arranged at upper and lower
portions of a single fixed bobbin 7 are disposed, at a portion between the voice coils 8 and 9 of
the bobbin 7 Slits or windows 10 are formed at a plurality of locations, and a plurality of joints
11 made of nonmagnetic material for concentrically holding the yoke 14 with respect to the
magnet 3 and the upper pole 12 and the lower pole 13 A speaker, characterized in that through
said slit 10 is arranged straddling the inner peripheral surface of the outer circumferential
surface of the yoke 14 of the magnet 3.
12-04-2019
2
[0007]
Further, in the first and second inventions, the joint 11 is made of a conductor and has a
symmetrical shape in the vertical direction.
[0008]
In the speaker having such a configuration, a joint 11 for concentrically holding the upper plate
1 and the lower plate 2 and the center pole 4 exists inside the magnetic circuit, and There is only
a thin dustproof cloth on the back, and since a support member such as the yoke 30 of the prior
art magnetic circuit does not project, a speaker of a very thin and compact magnetic circuit is
provided while having two sets of driving parts. be able to.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, the first
embodiment of the present invention will be described in detail. FIG. 1 is a cross sectional view of
the embodiment speaker in two directions, FIG. Each cross section in the two directions shown is
a cross section cut in the longitudinal direction along the main axis O in the directions of the
arrows OY and OX entered in FIG.
[0010]
In the magnetic circuit, the upper plate 1 and the lower plate 2 are fixed to the upper and lower
surfaces of the ring-shaped magnet 3, and the center pole 4 is made of nonmagnetic material (in
the present embodiment, a plurality of places). The magnetic gaps 5, 6 are formed symmetrically
above and below the center pole 4 from the inner peripheral surface of the magnet 3 so as to be
concentric with the upper plate 1 and the lower plate 2 by the joint 11 of FIG.
[0011]
In the two magnetic air gaps 5 and 6, the voice coils 8 and 9 which are symmetrically wound on
the upper and lower portions of a single bobbin 7 are disposed, as shown in detail in FIG. A slit or
window 10 is formed at a plurality of locations in the region between the voice coils 8 and 9 of
the bobbin 7, and the joint 11 penetrates the window 10 and the inner peripheral surface of the
magnet 3 and the center pole 4 Because it is disposed between the sides, movement of the voice
coil is not impeded during speaker operation.
[0012]
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3
The magnetic circuit is attached to the bottom of the frame 16, and the diaphragm 15 coupled to
the bobbin 7 is vibratably held by the edge 17 and the damper 18 inside the frame 16 like the
conventional speaker. There is.
[0013]
A dustproof cloth 19 is adhered to the back surface of the magnetic circuit to prevent dust from
invading the magnetic gap.
In the case of the short voice coil in which the winding width of the voice coils 8 and 9 is shorter
than the thickness of the upper and lower plates as in this embodiment, the dustproof cloth 19 is
directly adhered to the lower plate as described above. When a long voice coil is used, the
dustproof cloth 19 is disposed apart from the back surface of the magnetic circuit using, for
example, a spacer or the like by a sum dimension of the voice coil protrusion amount and the
dimension corresponding to the maximum amplitude of the speaker. It is natural to have to.
[0014]
FIG. 3 shows a modification of the speaker according to the present invention, in which the joint
11 is made of a nonmagnetic material having conductivity, and the cross section has a
symmetrical shape in the vertical direction. A ring 20 made of a nonmagnetic material is
disposed, and joints 11 are radially connected to the ring 20 to form an integral unit, and the
joint is used as a short ring for current distortion suppression.
In such a modification, not only the magnetic gap but also the joint 11 has the cross-sectional
shape symmetrical in the vertical direction because the eddy current generated in the joint 11
and the eddy current in each of the upper and lower drive parts This is because the action on the
voice coil needs to be equally symmetrical.
[0015]
As another form of the above modification, a shallow ring groove is formed on the side face
portion of the center pole 4 excluding the magnetic gap equivalent portion, and a conductive
nonmagnetic ring is inserted into the groove. It is good also as (illustration omitted).
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4
[0016]
The magnetic circuit of the above embodiment is of the external magnet type, but the
configuration of the present invention can be adopted even if it is an internal magnetic type
magnetic circuit.
FIG. 4 shows an embodiment of the second invention of the present application, wherein the
upper pole 12 and the lower pole 13 are fixed to the upper and lower surfaces of the magnet 3
and the outer pole 12 and the lower pole 13 have a U-shaped cross section and a ring shape. The
magnetic gaps 5 and 6 are formed symmetrically above and below the yoke 14 by the inner
peripheral surface of the yoke 14 and the outer surface of the upper pole 12 and the lower pole
13.
[0017]
After that, as in the first invention, the voice coils 8, 9 symmetrically mounted on the upper and
lower portions of a single bobbin 7 whose diaphragm 15 is fixed at one end to the upper and
lower magnetic gaps 5, 6, respectively. The slits or windows 10 are formed at a plurality of
locations in the region between the voice coils 8 and 9 of the bobbin 7, and the yoke 14 is
provided for the magnet 3, the upper pole 12 and the lower pole 13. A plurality of joints 11
made of nonmagnetic material for holding concentrically are disposed across the slit 10 and
straddle the outer peripheral surface of the magnet 3 and the inner peripheral surface of the
yoke 14.
The holding structure of the diaphragm 15 inside the frame 16 is also the same as that of the
first invention.
[0018]
The magnetic circuit of each of the above-described embodiments is divided into an inner
peripheral part and an outer peripheral part with a cylindrical surface including a magnetic gap
as a boundary, and preprocessed, and a voice coil bobbin is fitted, If the joint 11 is attached to
the center pole or the yoke or the magnet with a small screw or an adhesive, it can be easily
assembled.
12-04-2019
5
[0019]
Although the speaker according to the present invention has been described in detail based on
the embodiment considered to be representative, the embodiment of the speaker according to
the present invention is not limited to the structure of the above-described embodiment, and The
invention can be appropriately modified and implemented as long as it has the configuration
requirements described in the claims of the utility model registration, exhibits the action
according to the present invention, and has the effects described below.
[0020]
The loudspeaker according to the present invention has the following advantages.
[0021]
(1) As a speaker having a drive unit at two locations of a single voice coil bobbin, the voice coil in
the high region is suppressed from rising in impedance to prevent the lowering of the efficiency
of the high-pitched part, and The linearity can be canceled to suppress distortion of the
reproduced sound.
Therefore, reproduced sound with excellent frequency characteristics and low distortion can be
obtained.
[0022]
(2) In stereo, it is possible to obtain the left and right sum signal reproduction sound in the ultra
low range by a simple means
[0023]
(3) Since the joint for supporting the center pole or the yoke and the magnet in a concentric state
is mounted inside the magnetic circuit, the magnetic circuit portion becomes compact.
[0024]
(4) By combining the assembly ring (joint) as a short ring, high quality sound quality can be
expected without requiring special parts for improving the sound quality.
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6
[0025]
(5) The same magnetic circuit supports both high sound quality speakers and LR integrated
speakers
[0026]
(6) In the case of a speaker in which two coils are provided on the same bobbin, the change in
magnetic flux density due to the position of the coil can be canceled by the vertical symmetry of
the magnetic circuit and the vertical symmetry of the joint.
Thus, non-linear distortion is reduced.
12-04-2019
7
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