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DESCRIPTION JPH06292296

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DESCRIPTION JPH06292296
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
so-called electromagnetic induction type speaker which receives an electric signal to a primary
coil, moves a secondary coil coupled to a diaphragm, and emits sound from the diaphragm. is
there.
[0002]
2. Description of the Related Art Heretofore, in general, in a loudspeaker of this type, a primary
coil to which an electrical signal is inputted is directly wound around a pole, and the strength of
the coil itself is weak.
[0003]
Moreover, the terminal of the lead wire continued on both sides of the primary coil needs to be
connected to the input terminal to which an electrical signal is input.
In this case, when the primary coil is wound in two layers, the winding direction of the coil is
folded back from the second layer, the lead wires on both sides of the coil are aligned in the same
direction, and both extend in the same direction. The process for drawing out the lead wire can
be easily performed.
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[0004]
However, when the primary coil is wound in one layer, the lead wires are separated on both sides
in the direction of the coil center line. Therefore, when one of the lead wires is folded back like in
the case of double layer winding, a protrusion is formed in the folded portion As a result, the pole
gap between the primary coil and the voice coil is partially changed to cause deterioration in
sound quality. For this purpose, conventionally, the pole is provided with a groove or a hole for
passing the lead wire, and the lead direction of the both lead wires is aligned in the groove or the
hole through one lead wire.
[0005]
In addition, the lead wires arranged on both sides of the primary coil as described above are
adhered to, for example, the inner peripheral edge of the plate, ie, a member forming a part of
the magnetic circuit, and the terminal plate is fixed to this plate By soldering the lead wires to the
terminal plate, the terminal treatment of the lead wires continued on both sides of the primary
coil is performed.
[0006]
Further, the voice coil is formed by winding a coil made of a copper wire or the like around a
paper-made winding frame, and this voice coil is coupled to the central portion of the diaphragm.
[0007]
However, in the conventional speaker having the above-mentioned configuration, not only the
strength of the primary coil itself is weak, but also the fitting error between the primary coil and
the pole is large, and both of them are fitted to each other. There was a variation in fit.
Therefore, if the fitting between the primary coil and the pole is too tight, the primary coil may
be broken, while if the fitting is loose, the radial direction of the coil may be caused by the
softening of the adhesive due to heat or the like. There is a problem that the expansion and
contraction movement of the coil occurs, and the coil does not vibrate correctly in the direction
of the center line, resulting in the deterioration of the sound quality.
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[0008]
Also, with regard to the end treatment of the lead wires on both sides of the primary coil, it is
necessary to provide grooves or holes for passing the lead wires in the pole when the primary
coil is further drilled, so groove or hole processing of the pole is required. Not only is it
necessary, but also an operation for passing a lead wire through these grooves or holes is
required, and there is a problem that the manufacturing process becomes complicated and the
cost increases.
In addition, since the lead wires on both sides of the primary coil are connected to the plate and
the input wire is connected to the terminal fixed to the plate, the electrical connection of the
primary coil is deteriorated and the sound quality is degraded. there were.
[0009]
Furthermore, since the voice coil coupled to the diaphragm was to wind the coil around a papermade winding frame, there was a problem that noise occurred in the high frequency region,
resulting in deterioration of the sound quality.
[0010]
The present invention has been made in view of such conventional problems, and an object
thereof is to provide a speaker which can improve sound quality while realizing a simple
structure and cost reduction.
[0011]
The present invention solves the above-mentioned problems and the like, and in order to achieve
the above object, a primary coil mounted on a pole erected on a yoke, and the primary coil A
voice coil is coupled to a plate concentrically installed facing the yoke and attached to the yoke,
and a voice coil inserted in a ring-shaped magnetic pole gap formed between the plate and the
primary coil. In addition, in a speaker provided with a diaphragm that emits sound by vibration
of the voice coil in the direction of the coil center line, a bobbin on which the primary coil is
mounted is provided, and the lead wire of the primary coil is inserted through the bobbin A slit is
formed extending in the axial direction, and the primary coil is attached to the pole by fitting the
bobbin to the pole, and the voice coil is disposed concentrically with the primary coil. And one
turn of the secondary coil that is characterized by formed by a braking member which is attached
to the secondary coil.
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[0012]
Furthermore, it is possible to axially penetrate through holes through which the lead wires of the
primary coil are inserted in the yoke, and to provide terminals to which the lead wires are
connected on the surface opposite to the pole side.
[0013]
In addition, it is preferable to attach a cancel magnet, which cancels the magnetic force of the
magnet, to the yoke so as to surround the periphery of the terminal.
[0014]
According to the present invention, with the above construction, when the bobbin is fitted to the
pole, the slit provided on the bobbin can absorb the fitting error with the pole.
As a result, the primary coil wound around the bobbin can be fitted to the pole with a
predetermined strength, and the braking characteristic of the secondary coil can be improved by
the braking member to suppress high frequency noise. By these, the sound quality can be
improved.
[0015]
Furthermore, by inserting the lead wire through the through hole provided in the yoke and
connecting the lead wire to the terminal on the back surface side of the yoke, it is possible to
prevent the sound quality deterioration while facilitating the terminal processing of the lead wire.
[0016]
Also, by attaching a cancel magnet to the yoke, the terminals can be protected.
[0017]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a speaker
to which the present invention is applied will be described below with reference to FIGS.
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[0018]
A yoke 1 shown in FIG. 1 is formed in a disk shape, and a cylindrical pole 2 is integrally formed
at a central portion on one surface side of the yoke 1.
The tip of the pole 2 is slightly smaller in diameter than the base, and the bobbin 3 is fitted and
fixed to the smaller diameter.
[0019]
The bobbin 3 has a cylindrical shape as shown in FIGS. 1 to 2, and one place in the
circumferential direction is cut by the slit 4 which is continuous from one end to the other end in
the axial direction. It is possible to easily perform elastic deformation in the radial direction while
making it possible to insert a wire.
A primary coil 5 made of a coil wire material such as a copper wire is wound a plurality of times
and mounted on one side in the axial direction of the bobbin 3.
The primary coil 5 is wound around the outer peripheral surface of the bobbin 3 in a single layer,
and the adhesive bonds between the primary coil 5 and the bobbin 3 and between the lines of
the primary coil 5.
The lead wire 5a continuous to the winding start side set on the tip end side of the pole 2 of the
primary coil 5 is aligned in the same direction as the lead wire 5b continuous to the winding end
side by passing the slit 4 The lead wires 5a and 5b are wired in a horizontal arrangement.
[0020]
The bobbin 3 having the above configuration is lightly pressed into the small diameter portion of
the pole 2 through an adhesive, and the slit 4 absorbs variations in the inner diameter of the
bobbin 3 and variations in the outer diameter of the pole 2.
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The lead wires 5a and 5b on both sides of the primary coil 5 extend the outer periphery of the
pole 2 in the axial direction, and through holes 6 axially penetrating the flange portion of the
yoke 1 provided at the base of the pole 2 The face opposite to the pole 2 side (hereinafter
referred to as the "opposite side opposite to the pole side").
It is protruded to).
The protruding ends of the lead wires 5a and 5b are connected to an input terminal 7 provided
on the surface of the yoke 1 opposite to the pole side. The input terminal 7 is formed of a spacer
screwed to the yoke 1. One end of a connecting wire 8 connected to the input side of the electric
signal is connected to the spacer.
[0021]
A ring-shaped magnet 9 is fixed on the pole 2 side of the yoke 1 so as to be concentric with the
pole 2 with a predetermined gap between the pole 2 and the pole 2. A ring-shaped plate 10 is
attached to be concentric with 3. A ring-shaped narrow magnetic pole gap 11 is formed between
the plate 10 and the bobbin 3, and this magnetic pole gap 11 forms a magnetic circuit together
with the yoke 1, the pole 2, the bobbin 3, the plate 10 and the magnet 9. ing.
[0022]
In general, pure iron is used as the material of the yoke 1, the pole 2, the bobbin 3 and the plate
10 forming the magnetic circuit. The magnet 9 is a permanent magnet such as a cast magnet or a
ferrite magnet. An S pole is set on the surface on the yoke 1 side, and an N pole is set on the
surface on the plate 10 side. In this case, an N pole may be set on the surface on the yoke 1 side,
and an S pole may be set on the surface on the plate 10 side.
[0023]
The primary coil side was formed with the following dimensions as an example. That is, in FIG. 2,
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the bobbin 3 is made of iron and is formed to have a length BA of 10 mm, an inner diameter DA
of 22 mm, and a thickness tA of 1 mm, and cuts the slits 4 at intervals through which the wire of
the primary coil 5 passes. It formed. Then, the primary coil 5 was wound around the bobbin 3 to
a winding width C = 4.5 mm.
[0024]
A voice coil 12 is inserted in the magnetic pole gap 11 so as to be movable relative to the
primary coil 5 mounted on the pole 2 in the direction of the coil center line. As shown in FIGS. 1
and 3, the voice coil 12 includes a single-turn secondary coil 13 formed in a cylindrical shape by
bending a flat plate material such as aluminum alloy or copper, and the outer peripheral surface
of the secondary coil 13. It is comprised from the damping | braking member 14 stuck so that it
might cover. The braking member 14 is intended to damp or stop the vibration or motion of the
voice coil 12, and for example, kraft paper, senka paper or the like can be applied.
[0025]
In addition, this voice coil 12 was formed by the following dimensions as an example. That is, in
FIG. 3, the length BB of the secondary coil 13 and the damping member 14 is 7.5 mm, the inner
diameter DB of the secondary coil is 25.38 mm, the thickness tB is 0.15 mm, and the thickness tC
of the damping member 14 is It is 0.06 mm.
[0026]
An adhesive such as a lock varnish may be applied to the kraft paper or the like as the braking
member 14 in advance. In this case, the adhesion is weak when the braking member 14 is in a
dry state, and the adhesion can be exhibited only by immersing the braking member 14 in
alcohol. The braking member 14 is attached to the outer peripheral surface of the secondary coil
13 while being wet with alcohol. In addition, an adhesive such as lock varnish is also applied to
the secondary coil 13, and after drying, the braking member 14 dipped in alcohol is adhered to
each other with the adhesive of both the secondary coil 13 and the braking member 14 Since the
bonding can be performed, the bonding strength of the braking member 14 to the secondary coil
13 can be increased, and the bonding can be performed more firmly.
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[0027]
The voice coil 12 having the above configuration is coupled to the lower end of a dome-shaped
diaphragm 15 showing one specific example of the diaphragm. The dome-shaped diaphragm 15
has a circular shell shape, and the edge of the voice coil 12 abuts on the peripheral edge on the
opening side, and is integrally configured by fixing means such as an adhesive. The diameter D of
the dome-shaped diaphragm 15 shown in FIG. 1 is 25 mm.
[0028]
Further, a ring-shaped edge 16 is connected to the outer peripheral edge of the dome-shaped
diaphragm 15 over the entire circumference, and a ring-shaped fixing portion 16 a provided on
the outer peripheral edge of the edge 16 is a set screw or the like. It is fixed to the plate 10 by
the fixing means. Accordingly, the voice coil 12 is supported by the plate 10 via the dome-shaped
diaphragm 15 and the edge 16 so as to be movable relative to the primary coil 5.
[0029]
Further, on the surface of the yoke 1 opposite to the pole side, a ring-shaped cancel magnet 17 is
fixed by an adhesive, a fixing screw or other suitable fixing means so as to largely surround the
periphery of the input terminal 7. The cancel magnet 17 is for reducing the influence of the
magnetic field of the magnet 9 on the outside, but also serves as a protection function of the
input terminal 7 at the same time. This cancel magnet 17 is made of a permanent magnet such as
a cast magnet or a ferrite magnet as the magnet 9 is formed slightly smaller than the magnet 9
(about 70% of the magnet 9), and an N pole is set on one side. An S pole is set on the surface
side. Then, the S pole is made to face the S pole of the magnet 9 and the S pole is set on the yoke
side, thereby canceling the magnetic force acting from the yoke 1 to the outside. When the yoke
side of the magnet 9 is the N pole, the yoke side of the cancel magnet 17 is also set to the N pole
correspondingly.
[0030]
The dome-shaped speaker having the above configuration can be assembled, for example, as
follows. First, an adhesive is applied to the small diameter portion of the tip end of the pole 2 of
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the yoke 1, and the bobbin 3 on which the primary coil 5 is wound in advance is lightly pressfitted and fitted. At this time, the lead wires 5a and 5b on both sides of the primary coil 5 are
extended in the same direction by passing one lead wire 5a through the slit 4 and are drawn
outward from the side opposite to the coil.
[0031]
In this case, a slit 4 is formed in the bobbin 3 and elastic deformation is possible in the radial
direction by the slit 4, so variations in the outer diameter of the pole 2 and variations in the inner
diameter of the bobbin 3 are caused by the deformation of the bobbin 3. It can be absorbed.
Moreover, since the displacement amount of the bobbin 3 that absorbs the variation is extremely
small, and the stress that the primary coil 5 receives due to the displacement of the bobbin 3 is
extremely small, even if the primary coil 5 is weak, it is cut. Can be easily and reliably attached to
the pole 2 while maintaining a predetermined fitting relationship without causing any defects.
Therefore, the assembling operation of the primary coil 5 can be simplified, the manufacturing
efficiency is high, and the cost can be reduced.
[0032]
Further, as described above, since the primary coil 5 is aligned in one layer and wound around
the pole 2 with a predetermined fitting relationship, the adhesive for fixing the primary coil 5 is
softened by heat. Also, the primary coil 5 does not cause the expansion and contraction motion in
the radial direction, and can maintain a predetermined gap with the voice coil 12 to vibrate
relatively correctly, thereby improving the sound quality. Can be
[0033]
When AC power is supplied to the primary coil 5 via the connection line 8 and the input terminal
7, a magnetic field is generated in the primary coil 5 according to the strength of the power, and
a voice is generated according to the direction of the magnetic field The coil 12 is attracted or
repelled.
Accordingly, due to the vibration based on the suction and repulsion operation of the voice coil
12, the dome-shaped speaker 15 vibrates and a sound is emitted.
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[0034]
In this case, since the voice coil 12 is configured as described above, the combination of the
secondary coil 13 and the braking member 14 enables the voice coil 12 to be braked at an early
stage, and makes noise in the high frequency region. It is possible to suppress and improve the
sound quality.
[0035]
Further, since the lead wires 5a and 5b of the primary coil 5 are connected to the input terminal
7 provided on the surface opposite to the pole side of the yoke 1 through the through hole 6, in
the primary coil 5 of this type. The terminal processing of the lead wires 5a and 5b can be easily
performed, and the electrical connection of the primary coil can be improved to improve the
sound quality.
Moreover, since the input terminal 7 is surrounded by the cancel magnet 17, there is no
possibility that the input terminal 7 is accidentally hit and damaged during assembly or
transportation, etc., and the input terminal 7 is reliably protected. Can.
[0036]
Although explained above, the present invention is not limited to the above embodiment. For
example, the coil wire of the primary coil 5 may be a round material or a square material. Also,
the slits 4 provided in the bobbin 3 may be formed in shapes other than straight lines, such as a
V-shaped or S-shaped. Furthermore, although the example using the dome-shaped diaphragm 15
as a diaphragm was demonstrated in the said Example, of course, it is applicable to a coneshaped diaphragm. As described above, the present invention can be variously modified without
departing from the scope of the invention.
[0037]
As described above, according to the speaker of the present invention, the slit is provided on the
bobbin and the braking member is attached to the one-turn secondary coil. Therefore, the
variation in the outer diameter of the pole and the bobbin The variation in the inner diameter of
the coil can be absorbed by the slits of the bobbin, and the displacement of the bobbin at this
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time is extremely small, and the primary coil wound on the bobbin receives very little stress due
to the deformation of the bobbin. Even a weak primary coil can be easily and reliably mounted on
a pole while maintaining a predetermined fitting relationship without causing defects such as
cutting. Therefore, the assembling operation of the primary coil can be simplified, there is no
defect such as breakage of the coil, the manufacturing efficiency is high, and the cost reduction
of this type of speaker can be achieved.
[0038]
In addition, since the primary coil can be aligned in one layer and can be wound around the pole
with a predetermined fitting relationship, even when the adhesive for fixing the primary coil is
softened by heat during operation, It is possible to maintain a predetermined gap between the
primary coil and the voice coil without causing an expansion and contraction motion in the radial
direction and to vibrate relatively correctly, thereby improving the sound quality. An effect is
obtained.
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