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DESCRIPTION JPH0578099

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DESCRIPTION JPH0578099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
magnetic circuit for a speaker, and more particularly to a magnetic circuit for a speaker having a
short ring which is excellent in productivity and has a remarkable effect of improving the
distortion of the speaker.
[0002]
2. Description of the Related Art In order to reduce the level of current distortion of a speaker
and to suppress the rise in impedance in a high region, a magnetic circuit provided with a short
ring made of an electrically good conductor on a member constituting a magnetic path is used.
Although it has been used, as a conventionally known structure, a structure in which a short pole
made of copper is fitted to a center pole, or as shown in FIG. The center pole 11 projects from the
upper surface of the front plate 12 for the purpose of making the magnetic flux distribution in
the vibration direction symmetrical in order to reduce distortion, and the portion 11b of the
center pole 11 other than the magnetic gap is a magnetic gap 11a. A speaker magnetic circuit
having a smaller diameter and having a structure in which the short ring 15 is fitted to the small
diameter portion 11b exists. In the same figure, 13 is a magnet.
[0003]
Problems to be Solved by the Invention Since all of the conventional magnetic circuit short rings
having such a structure use copper cut or pressed into a ring or cap shape, In addition to being
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expensive, it is necessary to process the dimensions in accordance with the individual center
poles, and there are drawbacks that the number of types of parts increases and parts
management becomes difficult.
[0004]
Further, in the structure shown in FIG. 4, in order to fit the short ring 15 to the small diameter
portion 11b toward the root of the center pole 11, for example, the center pole 11 and the back
plate 14 are shown in FIG. There is a problem to be solved that it is necessary to have a structure
separated at a center pole and the like shown by a dashed dotted line, etc., and this causes the
inhibition of productivity.
[0005]
Therefore, the present invention overcomes the disadvantages of the prior art and improves
productivity without increasing the types of parts by using a tubular copper net having a
structure similar to a shield sleeve as a short ring member. To provide a speaker magnetic circuit
that can
[0006]
SUMMARY OF THE INVENTION The speaker magnetic circuit according to the present invention
for achieving the above object will be described with reference to FIGS. 1 to 3 showing an
embodiment of the present invention. A back plate 4 having a cylindrical center pole 1
protruding from the center, a front plate 2 forming a short ring magnetic gap with the center
pole 1, a magnet 3 sandwiched between the back plate 4 and the front plate 2 The magnetic
circuit for a speaker according to the second aspect of the present invention is a speaker
magnetic circuit having a structure in which a network short ring 5 of a good conductor is fitted
to the side surface of the center pole 1 except for the air gap portion. While 1 protrudes from the
upper surface of the front plate 2, a portion other than the magnetic gap of the center pole 1 is
formed to have a diameter smaller than that of the magnetic gap, and the small diameter portion
1b is A speaker magnetic circuit having a structure in which a mesh short ring 5 of a fine
conductor is fitted, and in any case, the mesh short ring 5 has a structure in which a large
number of conductive fine wires can be extended and contracted in a tubular mesh. It is
characterized by things.
[0007]
In the magnetic circuit having such a configuration, the network short ring 5 has a structure
similar to a shield sleeve and has elasticity in the longitudinal direction and diameter direction, so
that one type of network short ring is used. 5 can correspond to several types of center poles of
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different diameters.
[0008]
Further, the conductor thin wires 5a and 5b may be meshed in advance so as to be long, and cut
into a predetermined length each time it is necessary, so that the production can be made
inexpensively and quickly.
[0009]
Furthermore, even in the magnetic circuit having the shape shown in FIG. 3 (or FIG. 4), the gap
portion 1a where the diameter of the center pole 1 is increased is passed through with an
enlarged diameter and fitted in the small diameter portion 1b. It is possible to combine the center
pole 1 and the back plate 4 into an integral structure to reduce the manufacturing cost and to
reduce the assembly cost.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 to 3, the
embodiment of the present invention will be described in detail. FIG. 1 is a perspective view of
the network short ring according to the present invention in an uncut state. (Copper) The thin
wires 5a and 5b are diagonally cross each other and meshed in a cylindrical shape to form a
cylindrical structure 5c similar to a shield sleeve of a cable.
The cylindrical structure 5c can expand and contract in the diameter direction and the length
direction by changing the oblique angle of the conductor fine wire.
[0011]
FIG. 2 and FIG. 5 show an embodiment (first embodiment) of the first invention, FIG. 5 is an axial
sectional view, and FIG. 2 is a perspective view of a center pole portion. Outside the well-known
structure comprising a back plate 4 having a protruding portion 1, a front plate 2 forming a ringshaped magnetic gap together with the center pole 1, and a magnet 3 sandwiched between the
back plate 4 and the front plate 2 In the magnetic type magnetic circuit, the cylindrical structure
5c is cut to a predetermined length on the side excluding the air gap of the center pole 1
(specifically, the entire vibration area of the voice coil of the speaker including the air gap). The
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mesh short ring 5 is fitted.
The mesh short ring 5 may be simply fitted, but the lower end may be bonded to the root of the
center pole 1.
[0012]
FIG. 3 shows an embodiment (second embodiment) of the second aspect of the present invention,
in which the center pole 1 is an upper surface of the front plate 2 for the purpose of making the
magnetic flux distribution in the vibration direction symmetrical to reduce amplitude distortion.
The portion other than the magnetic gap of the center pole 1 is smaller in diameter than the
magnetic gap 1a, and the mesh short ring 5 is fitted to the upper and lower small diameter
portions 1b with the magnetic gap 1a interposed therebetween.
The center pole 1 and the back plate 4 are integrally formed, and the mesh short ring 5 at the
root of the center pole 1 is inserted from the tip of the center pole 1 and passes through the air
gap 1a while expanding the diameter. Lightly press from the periphery at the position to fit the
small diameter portion 1b.
The mesh short ring 5 above the gap 1a is fitted in the same manner as in the first embodiment.
In either case, it is desirable to bond each lower end to the center pole 1 as required.
[0013]
Although not shown, in the second embodiment, the mesh short ring 5 may be either above or
below the air gap 1a.
[0014]
In the second embodiment, since the magnetic flux distribution in the magnetic gap portion is
symmetrical in the vibration direction, the linearity of the drive system is good. Linear distortion
and current distortion level can be reduced.
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[0015]
Although the speaker magnetic circuit according to the present invention has been described in
detail based on the embodiment considered to be representative, the embodiment of the short
ring of the magnetic circuit according to the present invention comprises the wire material and
the method of knitting (for example, , Etc., the present invention is not limited to the structure of
the above-mentioned embodiment, but includes the requirements described in the claims of the
above-mentioned utility model registration, As long as it exhibits the effects and the effects
described below, it can be modified as appropriate.
[0016]
The speaker magnetic circuit according to the present invention has the following effects.
(1) Since the mesh short ring of the present invention is a shield sleeve similar structure and has
elasticity in the length direction and diameter direction, one mesh short ring can be adapted to
several center poles of different diameters. be able to.
Therefore, management of parts is easy.
(2) It is possible to cope with production inexpensively and quickly by cutting the conductor fine
wires into a mesh in advance so as to be long and cutting it to a predetermined length each time
it is necessary.
(3) Even in the magnetic circuit having the shape shown in FIG. 3, it is possible to expand the
diameter and pass the gap having the large diameter of the center pole and fit the small diameter
portion, and the center pole and the back plate As an integral structure, manufacturing costs can
be reduced and assembly costs can be reduced.
(4) As a speaker having a short ring, it is possible to reduce the level of current distortion and
suppress the rise in impedance in the high region to improve frequency characteristics.
[0017]
Furthermore, in the second embodiment, amplitude distortion can be reduced by making the
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magnetic flux distribution in the vibration direction symmetrical.
[0018]
With the above advantages, it has the effect of being able to provide a high-quality, highperformance speaker at low cost.
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