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DESCRIPTION JP2003009285

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DESCRIPTION JP2003009285
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker unit, and more particularly to a magnet unit of a small speaker unit used for headphones,
telephones and the like.
[0002]
2. Description of the Related Art In a conventional small speaker device, as shown in FIG. 4A, a
center pole portion 11A is provided at the center, and a magnet guide portion 11B is provided
around the center pole portion 11A. The hollow portion of the magnet 10, which is formed into a
cylindrical shape having a hollow portion 10A by a method such as sintering, of the center pole
portion 11A of the yoke 11 formed by forging a steel material into a substantially inverted Tshaped cross section. The magnet 10 is bonded and fixed to the yoke 11 in a state where the
magnet 10 is loosely attached to the magnet 10A and positioned by the magnet guide portion
11B.
[0003]
Next, as shown in FIG. 4B, a plate 12 formed by forging a steel material into a shape having a
hollow portion 12A provides a predetermined gap 13 between the center pole portion 11A and
the hollow portion 12A. The jig 17 is positioned with respect to the magnet 10 in a state of being
inserted and fitted and fixed to the magnet 10 to assemble the magnet unit.
[0004]
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Then, in a state where the yoke 11 and the plate 12 of the magnet unit thus assembled are
sandwiched between the porcelains (not shown), the magnet 10 is magnetized by the porcelains
to be made into a permanent magnet state. The jig 17 is removed to complete the magnet unit.
[0005]
Then, as shown in FIG. 4C, the resin molded frame 18 is fixed by inserting and adhering the
recess 18A to the outer peripheral portion of the plate 12.
Then, the edge portion 14A of the diaphragm 14 is fixed to the step 18B provided on the frame
18 to assemble the speaker device.
Further, 15 is a voice coil bobbin, 15A is a damper, and 16 is a voice coil wound around a
predetermined position of the voice coil bobbin. The voice coil bobbin 15 is bonded to the
diaphragm 14 and integrated with the diaphragm 14.
[0006]
However, in the speaker device having the structure assembled in this manner, the magnet 10 to
which the adhesive is applied and the assembly process in which the magnet 10 and the plate 12
are adhered and fixed are used. The plate 12 is bonded and fixed by pressure bonding.
Therefore, as is apparent from FIG. 5 which is an enlarged cross-sectional view of the portion and
the periphery of the void 13, the adhesive protrudes from the bonding portion between the
magnet 10 and the plate 12 toward the void 13 and solidifies. The protrusion B is formed.
[0007]
The voice coil bobbin 15 and / or the voice coil 16 contact the projection B when driven by the
drive signal inputted to the voice coil 16 and the voice coil bobbin 15 is made to vibrate. There is
a possibility that it may occur, and as a result, in the inspection at the time of the partial
assembly completion of the speaker device or the completion inspection, rejected products may
be generated and the yield rate (finished product / assembly line input product) may be lowered.
There was a problem.
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2
[0008]
As a method of solving this problem, it has also been proposed to enlarge the dimensions of the
magnet 10 and the hollow portion 10A of the center pole portion 11A.
However, according to this proposal, it is difficult to expand the external dimensions of the
magnet 10, particularly in the case of the magnet unit of a small speaker device. There is a
problem that the problem of decreasing the magnet strength of the magnet unit has to be solved.
[0009]
In view of the foregoing, the present invention prevents a protrusion formed by the adhesive
from protruding between the plate and the magnet to the hollow portion side from becoming an
obstacle to the movement of the voice coil bobbin and / or the voice coil. The purpose is
[0010]
SUMMARY OF THE INVENTION The speaker device according to the present invention has a
yoke provided with a center pole portion, a magnet having a hollow portion, and a plate provided
with an opening portion. The yoke is joined to one surface of the magnet in a state in which the
hollow portion is loosely transmitted from one surface of the magnet to the other surface, and
the plate is made with respect to the other surface of the magnet. A speaker device comprising a
magnet unit configured by joining a plate in a state where a predetermined air gap is formed
between an opening and a center pole portion, and the other side of this magnet to which the
plate is joined A notch is provided in a portion in contact with the opening provided in the plate,
and the notch is used as a reservoir of a bonding agent when the plate and the magnet are joined.
[0011]
According to the present invention, a notch is provided in a portion in contact with the hollow
portion of the plate on the other side of the magnet to which the plate is bonded and integrated,
and the notch is used as the plate. By making the adhesive reservoir when the magnet is joined
and integrated, it is possible to reduce the amount of the adhesive that protrudes from the space
between the plate and the magnet to the hollow portion side, The protrusion formed by this
protrusion can be prevented from obstructing the movement of the voice coil bobbin and / or the
voice coil.
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[0012]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the speaker apparatus
according to the present invention will be described below with reference to the drawings.
[0013]
FIGS. 1 to 3 show an example of an embodiment in which the present invention is applied to a
speaker unit, particularly to a magnet unit of a small speaker unit used for headphones,
telephones and the like.
FIG. 1 is a front view of a small speaker device 1 having a diaphragm diameter of about 40 mm,
an air gap length of 1 mm, and a distance between an inner circumferential opening of a magnet
and a center pole of about 1.5 mm. FIG. 6 is a cross-sectional view showing a cross section of the
small speaker device 1 cut at a position of a cutting line indicated by a dashed dotted line, viewed
from the directions indicated by arrows A and A. .
[0014]
As shown in FIG. 1, the yoke 25 is integrally formed with a central portion of a disk-like yoke
portion 26 and a yoke portion 26 having a predetermined thickness produced by forging from a
steel material. It is comprised by the column-shaped center pole part 27 planted.
The outer peripheral surface 26 a of the yoke portion 26 is formed in a disk shape having a
predetermined radius from the center of the center pole portion 27.
[0015]
The magnet 31 has an inner peripheral opening 32, an outer peripheral portion 33, a lower
surface 34 and an upper surface 35, and is formed of a hollow cylindrical magnet member
having a predetermined thickness.
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Further, the lower surface 34 side of the magnet 31 has an inner diameter dimension that is the
same size as the diameter of the outer peripheral surface 26 a of the yoke portion 26 or slightly
larger than the tolerance range, and the recess 34 b cut inward toward the magnet 31 The flange
34 a is formed between the recess 34 b and the outer peripheral portion 33.
When the outer peripheral surface 26a of the yoke portion 26 is inserted into the recess 34b, the
center point of the outer peripheral surface 26a of the yoke portion 26 coincides with the center
of the inner peripheral opening 32. The recess 34b is formed at the position.
[0016]
Further, the upper surface 35 of the magnet 31 is slanted toward the upper surface 35 from the
inner peripheral opening 32 slightly below the position where the upper surface 35 intersects
the inner peripheral opening 32. A notch 35 a having a triangular cross section having an
opening communicating with the inner circumferential opening 32 is provided over the entire
circumference of the inner circumferential opening 32. When the speaker device 1 is a smallsized speaker device having a diameter of about 40 mm of the diaphragm, the size of the cutout
35a is such that the height of the opening is about 1 mm and the depth is about several mm It is
formed to be
[0017]
As one example, the magnet 31 is prepared by mixing a powder material of a rare earth
permanent magnet with a binder consisting of a powder of thermosetting polymer resin such as
polyamide resin and epoxy resin which are known as a method of producing a bonded magnet.
The powder material is made to the required shape and dimensions by an injection molding
method using a precision mold.
[0018]
At the upper surface 35 side of the magnet 31, the magnet 31 vertically extends from the upper
surface 35 of the magnet 31 centering on a position separated by a predetermined dimension
from the center of the inner peripheral opening 32. A pair of positioning holes 36, 36 are
provided with a predetermined depth towards them.
[0019]
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Reference numeral 40 denotes a ring-shaped plate having a predetermined pressure generated
by forging a steel material, and the plate 40 is provided with an opening 19 at its center and on
the side of the lower surface 40a of the plate 40. In the state where the center of the opening 19
is aligned with the center of the inner peripheral opening 32, the plate 40 can be positioned at a
position that can coincide with the pair of positioning holes 36, 36 provided on the upper surface
35 of the magnet 31. A pair of positioning pins 41, 41 are provided in a state of vertically
projecting downward from the lower surface portion 40a.
[0020]
Next, an example of the process of assembling the magnet unit 24 shown in FIG. 1 by each of the
yoke 25, the magnet 31 and the plate 40 will be described.
[0021]
First, a yoke 25 having an adhesive applied to the upper surface 26b, a magnet 31 having an
adhesive applied to the recess 34b on the lower surface 34, and an annular flange 34a are used
to form an outer peripheral surface 26a of the yoke 25. Is positioned so that the guide 25 is
guided, the yoke 25 is inserted into the recess 34b using a press machine or the like, and the
adhesive is solidified in a state in which the yoke 25 is joined tightly. By fixing them, the yoke 25
and the magnet 31 are integrated.
[0022]
Next, the adhesive is applied to the necessary area of the upper surface 35 of the magnet 31 in
the integrated state, and the adhesive is applied to the necessary area on the lower surface 40a
of the plate 40, and then positioned. With the pins 41 and 41 fitted and guided in the positioning
holes 36 and 36 of the magnet 31, the upper surface 35 of the magnet 31 and the lower surface
40a of the plate 40 are superposed to form a press machine or the like. The upper surface
portion 35 side and the lower surface portion 40a side are pressure-bonded to solidify the
adhesive so that the yoke 25, the magnet 31 and the plate 40 are integrated as shown in FIG.
[0023]
In this case, when the upper surface portion 35 and the lower surface portion 40a are pressurebonded in this way, most of the adhesive b pushed out in the direction of the inner peripheral
opening 32 is stored in the notch 35a. In this state, the adhesive b is almost completely
prevented from being pushed out into the inner circumferential opening 32 and solidified, and
the solidified portion is a vibration of the voice coil bobbin 8 and / or the voice coil 8a. Operation
failure is prevented.
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[0024]
Thus, the magnet 31, the yoke 25 and the plate 40 are fixedly integrated, and a gap 13 of a
predetermined size is provided between the opening 19 of the plate 40 and the center pole 4a.
Then, the magnet 31 is magnetized by a magnetizing device (not shown) mounted in a state
where the yoke 25 and the plate 40 are held between the yokes 25 and the plate 40 to be
permanent magnetized, and the magnet unit 24 is completed.
[0025]
Next, an example of the process of assembling the electric / sound converter of the speaker
device of the present invention will be described with reference to FIG.
[0026]
7 has a bottom surface 7a fixed to the upper surface of the plate 40 and is attached to the plate
40. A metal plate made of steel plate or the like is integrally formed by pressing, and a truncated
cone is inverted. 7b is an opening formed in the center of the bottom 7a.
The edge outer peripheral portion 2, the diaphragm 5, the voice coil bobbin 8, the voice coil 8 a,
the damper 9, the sheet pile 12, the free edge 12 B, the cap 14 and the air gap 13 constitute an
electro-acoustic converter of this dynamic speaker.
[0027]
A space 13 is formed between the center pole 27 and the plate 40 concentrically with the center
pole 27 and is spaced along the outer periphery of the center pole 27 by a predetermined
distance. The voice coil bobbin 8 and the voice coil 8a wound on the outer peripheral surface of
the voice coil bobbin 8 are positioned in a state in which the voice coil bobbin 8 is inserted and a
predetermined air gap is formed on both the inner and outer peripheral sides of the bobbin 8 It is
fixed.
[0028]
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The damper 9 is joined to the voice coil bobbin 8 projecting upward from the plate portion 40 of
the voice coil bobbin 8 in such a state of being temporarily fixed and positioned, and the outer
peripheral side of the damper 9 is The voice coil 8 a is joined to the bottom surface 7 a of the
frame portion 7 so that the voice coil 8 a is positioned at a predetermined position with respect
to the air gap 13.
In addition, a bonding open portion in which the edge outer peripheral portion 2 of the
diaphragm 5 is joined to the largest opening 21 of the frame portion 7 and the inner diameter
portion 5a of the diaphragm 5 protrudes above the plate portion 6 of the voice coil bobbin 8 It is
joined to the outer peripheral side of 5b.
[0029]
Then, the sheet pile 12 is adhered to the edge outer peripheral portion 2 in a state of being
adhesively fixed to the maximum opening 21, and the process of assembling the electric /
acoustic converter of the speaker device of the present invention is completed.
[0030]
In the example shown in FIG. 1, the upper surface 35 of the magnet 31 is closer to the upper
surface 35 from the inner peripheral opening 32 slightly below the position where the upper
surface 35 intersects the inner peripheral opening 32. A cutout 35a having an opening that is
obliquely removed in the direction and is in communication with the inner peripheral opening 32
side and has a triangular cross section is provided over the entire periphery of the inner
peripheral opening 32 However, as shown in FIG. 3, the upper surface 35 of the magnet 31
extends along the upper surface 35 from the inner peripheral opening 32 slightly below the
position where the upper surface 35 intersects the inner peripheral opening 32. A step 37 having
a rectangular cross-sectional shape, which is eliminated in parallel in the longitudinal direction
may be provided over the entire circumference of the inner peripheral opening 32.
Others are configured the same as in FIG. 1 or FIG.
[0031]
It can be easily understood that the same function and effect as in the example of FIG. 1 can be
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obtained also in this example of FIG.
[0032]
Further, in the magnet unit shown in FIG. 1 and FIG. 3, positioning holes 36 fitted to the
respective positioning pins 41 are provided at two symmetrical positions from the center of the
center pole portion 27.
However, in the present embodiment, the positioning pins 41 and the positioning holes 36 fitted
to the positioning pins 41 are not limited to being provided in pairs, and may be provided in
pairs or more.
Others are configured the same as in FIG. 1 or FIG.
[0033]
Furthermore, without providing the flange 34a in the magnet 31, as shown in FIG. 4A, the
magnet guide portion 11B is provided around the center pole portion 11A, and the inner
peripheral opening 32 of the magnet 31 is used as the magnet guide portion 11B. The lower
surface portion 34 of the magnet 31 may be bonded and fixed with an adhesive to the yoke 25 in
the state of being positioned by the above, and the pair of positioning pins 41, 41 A jig for
providing a predetermined air gap 13 between the center pole portion 27 and the inner
circumferential opening 32 as shown in FIG. 4B without providing and without providing the pair
of positioning holes 36 in the magnet 31. The ring-shaped plate portion 40 may be positioned
with respect to the magnet 10 in a state in which it is inserted and may be bonded and fixed to
the magnet 10
Others are configured the same as in FIG. 1 or FIG.
[0034]
As an example, the magnet 31 is prepared by mixing a powder material of a rare earth
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permanent magnet with a binder consisting of a powder of thermosetting polymer resin such as
polyamide resin and epoxy resin known as a method of producing a bonded magnet. The powder
material is not made according to the required shape and size by the injection molding method
using a precision mold, but using a magnet made by sintering a powder material of a permanent
magnet such as rare earth. It is also good.
Others are configured the same as in FIG. 1 or FIG.
[0035]
Also, the magnet unit may be configured as an inner magnet type.
Others are configured the same as in FIG. 1 or FIG.
[0036]
Of course, the present invention is not limited to the above-described example and various other
configurations can be adopted without departing from the scope of the present invention.
[0037]
According to the present invention, when the upper surface side of the magnet and the lower
surface side of the plate portion are pressure-bonded, they are pushed out toward the voice coil
bobbin and / or voice coil on the inner peripheral opening side. Most of the adhesive is solidified
in the state of being stored in the notch, and almost prevented from solidifying in the state of
being pushed out to the inner peripheral opening side, and the solidified portion is a voice coil
bobbin and / or voice coil There is an advantage that it is prevented that it becomes an obstacle
of vibration operation.
[0038]
Brief description of the drawings
[0039]
1 is a cross-sectional view showing the main part of the speaker device according to the present
invention.
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[0040]
2 is a diagram showing a front view of this speaker device.
[0041]
3 is a cross-sectional view showing the main part of another example of the speaker apparatus.
[0042]
4 is a cross-sectional view for explaining the assembly of the conventional speaker device.
[0043]
5 is a cross-sectional view for explaining the main part of the conventional speaker device.
[0044]
Explanation of sign
[0045]
DESCRIPTION OF SYMBOLS 1 ............ Speaker apparatus, 8 ......... Voice coil bobbin, 8a ......... Voice
coil, 19 ......... Opening part 31 ......... Magnet, 35 ......... Upper surface part, 35a ......... Notch part, 40
... ...... Ring-shaped plate portion 40a ...... Lower surface portion b ...... Adhesive agent,
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