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JPH08172697

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH08172697
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
manufacture and construction of a loudspeaker having a combination of integral diaphragm and
dust cover.
[0002]
BACKGROUND OF THE INVENTION Prior art loudspeakers typically include a magnet assembly, a
loudspeaker frame, and a diaphragm mounted within the loudspeaker frame. The upper edge of
the loudspeaker diaphragm is attached to the loudspeaker frame by so-called beads. In addition,
a voice coil support with voice coil is installed in the magnet arrangement and attached to the
diaphragm. The voice coil support is attached to these parts, centered within the magnet
arrangement, usually using a so-called centering membrane which extends between the voice coil
support and the loudspeaker frame. Usually, the area in the diaphragm where the voice coil
support is installed is covered by a dust cover. According to the principle of installation, this dust
cover is either fixed to the diaphragm with adhesive or the diaphragm and dust cover are made
in one piece.
[0003]
If the diaphragm and the dust cover are made in two parts, the magnet assembly consisting of
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upper and lower pole plates, rings of permanent magnets and pole bodies is first formed in the
manufacturing process. The speaker frame is then attached to this magnet arrangement.
Thereafter, a voice coil support on which the voice coil is wound is inserted into the air gap of
the magnet arrangement and aligned therewith. It is ensured by the use of a sleeve sliding the
voice coil support on the pole body. When the voice coil support is aligned with the air gap, the
voice coil support is attached to the speaker frame by a centering membrane. After this step, the
loudspeaker diaphragm, which has previously been provided with a bead at its upper edge, is
inserted into the loudspeaker frame. The upper end of the voice coil carrier now penetrates into
the diaphragm opening. After the diaphragm has taken its final position in the speaker, the
diaphragm is adhesively fixed to the voice coil support. Before the diaphragm is inserted into the
speaker frame, the bead of adhesive is also placed on the upper edge of the speaker frame so that
the beads are attached to the speaker frame simultaneously during this process. When the above
mentioned adhesive hardens, the sleeve between the voice coil support and the pole body is
removed and the dust cover is adhesively fixed to the diaphragm so that it joins the voice coil
support and the diaphragm Cover the space on the part.
[0004]
Form individual substructures of voice coil support, centration membrane, diaphragm and bead
and install and attach this substructure to the magnet assembly or frame in one step using the
sleeve described above Things are also known.
[0005]
If a one-piece diaphragm dust cover assembly is used, the manufacture of the speaker first forms
a partial magnet arrangement consisting of a permanent magnet and an upper pole body, which
is then attached to the speaker frame Done in a similar way.
The voice coil support with voice coil is then inserted into this partial magnet arrangement and
attached to the loudspeaker frame by means of a centering membrane. Again, a sleeve disposed
between the voice coil support and the upper pole body is used to adjust the centering between
the voice coil support and the partial device. After the diaphragm dust cover assembly is attached
to the speaker frame, the upper edge of the speaker frame is adhesively secured to the bead
already attached to the assembly and the voice coil support is adhesively secured to the
diaphragm Be done. After the adhesive has solidified, the sleeve is withdrawn from between the
upper pole body and the voice coil support, and the magnet arrangement is closed by a device
formed from the lower pole plate and the pole body.
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[0006]
Each of the above two manufacturing methods has advantages and disadvantages. Loudspeakers
manufactured according to the first installation principle are superior to the others in that they
have very good vibratory centering with respect to the axis of the loudspeaker. However, it is
believed that the disadvantage is that the weight of the adhesively secured dust cover and the
diaphragm is slightly heavier than that of the mounting method referred to later.
[0007]
The second method of attachment has the disadvantage that centering of the pole body relative
to the voice coil support is not very accurate if the centering sleeve is present first and then the
lower pole plate and pole body and magnet assembly are closed. is there. Another disadvantage is
that special measures have to be taken for their transport to ensure that the diaphragm dust
cover assembly is not damaged and is properly handled. This procedure is accomplished by
stacking the assemblies for transport and inserting a ring between each two assemblies. This ring
requires transportation to return to the manufacturer of the assembly or is discarded at the
speaker manufacturer's facility to increase the amount of waste.
[0008]
In addition, it is also known to attach a diaphragm surface with small protrusions to prevent
direct stacking on the diaphragm surface. However, if the diaphragm and dust cover are
assembled as one piece, these projections must be very large to prevent any contact between the
facing surfaces. However, such protrusions increase the weight of the diaphragm.
[0009]
SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a
method of manufacturing a loudspeaker which avoids the drawbacks of the prior art as described
above.
[0010]
SUMMARY OF THE INVENTION It is an object of the present invention to construct a bead in one
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step using a diaphragm dust cover assembly, a bead, and an upper portion of a two-part
loudspeaker frame. The diaphragm is formed by attaching it to the upper part of the speaker
frame, and in a separate step the magnet assembly is attached to the lower part of the two-part
loudspeaker frame and the voice coil support with voice coil is centered Attached to the lower
portion of the speaker frame in alignment with the magnet assembly, and in the subsequent
steps, the upper portion of the speaker frame of the formed structure is located on the lower
portion of the speaker frame, both portions and the diaphragm The invention is achieved by a
method of manufacturing a loudspeaker characterized in that it is mounted on a voice coil
support.
[0011]
Advantageous further features of the invention are described in claims 2 to 7.
[0012]
If the speaker frame is assembled from two parts in the manner as described above, a bead
connecting the combination of the upper part of the frame and the diaphragm dust cover is used
to join the two parts into a single construction This single structure can be another conventional
method consisting of a closed magnetic device of the magnetic path, a voice coil support, a
centering membrane and the lower part of the speaker frame In connection with the loudspeaker
axis without the need for an adhesive seam to increase the weight between the dust cover and
the diaphragm by using a closed magnet assembly, joined with the assembled partial structure
and the magnetic path closed It is possible to obtain a speaker whose center is exactly coincident.
Magnetic path closed magnet means that all the attachment parts are firmly attached to one
another and it is not necessary to close the voice coil support after it has been inserted into the
air gap .
[0013]
It is further simplified if the joining of the lower part and the upper part of the frame by the
method of claim 2 is performed simultaneously with the joining of the voice coil support and the
diaphragm.
[0014]
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According to claim 3, the assembled length of the upper part along the axis of the loudspeaker is
at least a space between the combination of the diaphragm and the dust cover and the bead
when the two components are superimposed on one another for transport etc. If the length is
sufficient to leave, the constructions can be prefabricated and stacked on top of one another
without the risk of the stacked diaphragm dust cover combinations being lifted together.
If the beads have contact points associated with one another, the stacked structure can be used
to eject the adhesive between the bead and the diaphragm or upper part.
[0015]
If means for preventing lateral movement of the loudspeaker relative to the axis are provided on
the upper edge of the upper part of the loudspeaker frame, ie if the upper part of another
structure is arranged on this edge, the arrangement It will be possible to stack the body safely
high on one another.
[0016]
According to claim 5, mutually complementary guides are provided on the facing edges of the
upper and lower parts of each loudspeaker frame to guide the upper part along the axis of the
loudspeaker and the upper part of the arrangement If lowered towards the lower part, very
accurate centering about the axis of the loudspeaker can be achieved.
The shape of the guide can also determine some unique position where the upper part can be
lowered towards the lower part.
[0017]
If the lengths of the guides are aligned with one another in the direction of the axis of the
loudspeaker so that they are locked together before the voice coil supports are inserted into the
space under the dust cover, Centering is further improved.
[0018]
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The attachment of the upper part of the loudspeaker frame and the diaphragm is particularly
simple if both parts are joined by a flexible adhesive and have the function of a bead after it has
solidified.
However, this is because the bead joining the diaphragm to the upper part is adhesively fixed in a
conventional manner, ie one edge to the diaphragm with the other edge to the upper part of the
frame It does not mean that you can not have an arched bead.
The latter shape is somewhat more expensive than the first specified shape in order to fix and
bond with adhesive.
[0019]
The invention will be explained in more detail in the following by means of the drawings.
FIG. 1 is a cross-sectional view of two structures 10 in an overlapping state. Each of these two
constructions 10 comprises an integral diaphragm dust cover assembly 11, a bead 12 and an
upper portion 13, wherein the bead 12 carries the upper edge 14 of the diaphragm 15 to the
upper portion 13. It is connected to the flange 16 of, which is shown here in a circle. The bead
12 of the present invention is a bead of adhesive. To that end, the diaphragm dust cover
assembly 11 and the upper part 13 are placed in a tool (not shown) and a flexible adhesive is
used to form a bead of adhesive. Is positioned between the upper edge 14 of the diaphragm 15
and the flange 16 so as to adhesively fix the upper edge 14 of the diaphragm to the flange 16.
[0020]
FIG. 1 clearly shows that the two upper parts 13 have an edge 17 and extend in the direction of
the dust cover 19 along the axis of the loudspeaker. The completed length of this edge 17 is such
that the diaphragm dust cover assembly 11 and the bead 12 of one of the components 10 form
the other component 10 when the two components 10 are superimposed on one another. 11 and
12 are not in contact with the length. The space between each part 11, 12 in the stacked state
can be used to solidify the adhesive bond between the two stacked structures 10.
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[0021]
FIG. 3 shows a cross-sectional view of another configuration of two structures 10 superimposed
on one another. The edge 17 of each of the two upper parts 13 is somewhat different from FIG.
In FIG. 3, the diaphragm 15 is attached to the flange 16 of the upper portion 13 with a
conventional bead 12 'rather than a bead 12 of adhesive glue. To that end, the edge area 20.1 of
the arched bead 12 'is adhesively fixed to the upper edge 14 of the diaphragm 15 and the other
edge area 20.1 is adhesively fixed to the flange 16.
[0022]
The upper edge of the upper part 13 is provided with a step to prevent lateral displacement of
the construction 10 with respect to the loudspeaker axis 18 when they are superimposed on one
another. When the two constructions 10 are superimposed on one another by placing the edge
17 of one upper part 13 on the edge 17 of the other upper part 13, the wall 21 of the upper part
13 is placed on the upper part Prevent 13 radial displacements.
[0023]
The construction of the loudspeaker 22 will now be described in more detail in connection with
FIG. First, a permanent magnet arrangement 23 is formed which comprises, for example, a
permanent magnet ring 24, an upper pole plate 25, a pole body 26 and a lower pole plate 27. In
the illustrated configuration, the lower pole plate 27 and the pole body 26 are assembled as a
single unit. Then, in a separate step, the lower portion 28 is attached to the upper pole plate 25
and then forms the speaker frame 29 when assembled with the upper portion 13. Thereafter, the
voice coil support 30 on which the voice coil 31 is wound is inserted into the magnet device 23.
A sleeve (not shown) is placed between the voice coil support 30 and the pole body 26 to achieve
alignment of the voice coil support 30 with the pole body 26 or the shaft 18 of the speaker. The
voice coil support 30 is then attached to the lower portion 28 by the centering membrane 32
and the sleeve is then removed.
[0024]
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Then the arrangement 10 indicated by the arrow in FIG. 1 is placed on top of the assembly
constructed in this way. Adhesive is provided to only one or both of the areas to be joined to
achieve a bond between the voice coil support 30 and the diaphragm dust cover assembly 11
and between the upper part 13 and the lower part 28. Ru. These regions are indicated by K in
FIG.
[0025]
A voice coil support having a diameter slightly smaller than the cutout 33 under the dust cover
19 if the construction 10 is lowered sufficiently towards the assembly so that the upper part 13
rests on the lower part 28 The body 30 penetrates the space under the dust cover 19.
[0026]
At this time, it should be pointed out that the connection between the upper portion 13 and the
lower portion 28 does not necessarily have to be fixed with an adhesive.
Rather, in another non-illustrated shape example, the connection between both parts 13, 28 can
be welded or made with snap hook connection.
[0027]
FIG. 4 shows an alternative construction to that shown in FIG. The shape of the upper portion 13
is the same as that shown in FIG. 3 and the area 35 of the lower portion 28 carrying the edge 17
of the upper portion 13 is U-shaped and the edge 17 of the upper portion 13 is It is different
from the exemplary embodiment of FIG. 2 in guiding it when it is located on the lower part 28.
FIG. 4 shows the edge 17 of the upper portion 13 before the voice coil support 30 reaches the
space 35 under the dust cover 19 because of the relationship between the U-shaped
arrangement of the area 35 and the indicated space. Clearly show that it has already penetrated
into the groove of the U-shaped cross section of the region 35. This ensures accurate centering of
the speaker assembly.
[0028]
The two-part structure of the speaker frame 29 can also be used to secure the contact pins 36
inserted into the speaker frame 29 against withdrawal.
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[0029]
According to FIG. 5a, when the upper part 13 reaches the final position of the lower part 28, the
contact pins 36 are arranged on the lower part 28 of the loudspeaker frame 29 and located on
the edge 17 of the upper part 13. The fixation is performed by the through holes 37.
[0030]
According to FIG. 5 b, the contact pin 36 is inserted into the lower part 38.
The pin 38 'is placed on the lower end of the edge 17 of the upper part 13.
This pin 38 ′ penetrates into the opening 37 in the contact pin 36 when the upper part 13 is
located on the lower part 28. Since the pin 38 'has the same slope as the lower portion 28, this
pin 38', together with at least one other pin 38 '(not shown), has the same function as the
function performed by the U-shaped cross-sectional shape of FIG. Can perform the functions of
[0031]
Brief description of the drawings
[0032]
1 is a cross-sectional view of two structures superimposed on one another.
[0033]
2 is a cross-sectional view of the speaker.
[0034]
FIG. 32 is a cross-sectional view of two stacked upper portions.
[0035]
4 is a cross-sectional view of the speaker of another embodiment different from FIG.
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[0036]
5 is a cross-sectional view of the upper portion and the lower portion in the assembled state.
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