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JPS61285897

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DESCRIPTION JPS61285897
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dome-shaped speaker, and more particularly to a dome-shaped speaker in which the assembling
process can be simplified and the performance can be improved. (Prior Art) A conventional
dome-shaped speaker is configured as shown in the cross-sectional view of FIG. 5 (A) and the
partial enlarged view of FIG. 5 [B]. And yoke 21. センターポール22、マグネット23. Each
member is fixed by an adhesive, but when forming the gap 25, a treatment having a cylindrical
portion corresponding to the gap is fitted to the center pole 22 and the top plate 24 is adhered.
Fixed. Reference numeral 30 denotes a vibration system, in which a dome-shaped diaphragm 31
and a coil bobbin portion 32 are integrally formed and an edge portion 33 which is curved to this
is separately bonded, or the dome-shaped diaphragm 31 and the edge portion 33 are integrally
molded. In the case of assembly where there is a coil bobbin portion 32 bonded to it, etc. 0, the
outer peripheral edge of the edge portion 33 is disposed so as to be sandwiched by a damper
27.27 in a mounting step 26 formed on the top plate 24, Thus, the voice coil 34 is disposed at a
predetermined position in the gap 25 so as to cover the frame 40. However, a jig is also used
when the voice coil is disposed in the gap. As a vibration system for a full range, a prototype
formed by integrally molding a dome-shaped diaphragm, a coil bobbin, and an edge portion
formed to extend from the lower end portion thereof is produced. However, it has been reported
in part that it was not practical. (Problems to be Solved by the Invention) In the conventional
dome-shaped speaker shown in FIGS. 5 (A) and 5 (B) described above, various jigs are used in
each assembly process, and these jigs are used after the adhesive is solidified. Since it is
necessary to set the clearance for taking out, these clearances, dimensional tolerance of each
part, variation in work, etc. become accumulation error and gap interval becomes large or
becomes non-uniform as the cumulative error. It was a factor. Moreover, since the adhesive is
used to fix each member in the conventional dome-shaped speaker, it takes time for its drying
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and solidification, and not only there is a time loss in the assembly process, but the use of the
adhesive causes distortion. There was a drawback. In addition, the magnetic circuit in the case of
using the integrated diaphragm according to the above report has a complicated structure such
as dividing the top plate, and the structure of incorporating the vibration system into the
magnetic circuit is complicated. And other problems.
In general, the gap depth does not need to be set so large in a speaker having a small voice coil
amplitude l, such as a mid-high range speaker, but rather, uniformity of the gap interval and
narrowing of the gap as much as possible It should. The present invention has been made from
such a point of view, and the object of the present invention is to eliminate the drawbacks of the
conventional dome-shaped speaker described above, and to simplify each member without using
an adhesive, a jig, etc. In addition, it is possible to properly assemble, and it is possible to narrow
the gap as much as possible to increase the magnetic flux density and uniformize the gap interval
to achieve uniform magnetic flux distribution, thereby improving the feeling by the dome type
speaker To provide. Configuration of the Invention (Means for Solving the Problems) In the
dome-shaped speaker according to the present invention, a dome-shaped diaphragm, a coil
bobbin portion, and an edge portion extending horizontally from the lower end portion are
integrally formed. A guide portion for arranging an edge is formed in a portion positioned on the
magnet side of the inner periphery of the top plate, and the end wall of the outer peripheral edge
of the edge portion is fitted in contact with the back wall of the guide portion. The assembly of
the magnetic circuit unit and the predetermined of the vibration system are performed by
clamping by the edge pressing member and causing the-· portion of the guide portion formed on
the top plate to be engaged with the engaging portion provided on the upper outer peripheral
edge of the center pole. The arrangement to the position is performed at the same time.
(Operation) The magnet member is disposed on the yoke, and the edge portion of the domeshaped diaphragm is fitted and set on the guide portion formed on the top plate in a state of
being sandwiched by the edge pressing member. Position a part of the guide portion formed on
the top play 1 in the portion and press fit. As a result, the magnet member is clamped and fixed
between the yoke and the top plate, and a part of the guide portion of the top plate is closely
fitted to the engaging portion of the center pole so that the top plate is properly fixed, while the
diaphragm is its edge The centering is set in a state where the outer peripheral end of the portion
is guided by the back wall of the guide portion, the voice coil is properly set in the gap and the
edge portion is held by the edge holding member. When the magnet member is magnetized in
the assembled state, the yoke and the top plate are attracted and fixed more firmly. In the case of
assembling as described above, it is possible to simplify the assembling process as well as to
eliminate the need for the adhesive and to eliminate the time loss for the drying and
solidification. Moreover, by assembling as described above, a predetermined gap is automatically
formed between the center pole upper end outer peripheral surface and the top plate inner
peripheral surface, but a jig or the like is used to form the gap. In addition, the edge of the domeshaped diaphragm is guided by the back wall of the guide on the top plate and is automatically
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2
centering set, and the Poise coil is automatically set in the gear tube fixed position and the
diaphragm etc. There is no need for unnecessary gap setting because jigs and the like for setting
are unnecessary, and the dimension setting between the upper end outer peripheral surface of
the center pole and the inner peripheral surface of the top plate requires the minimum necessary
for moving the coil bobbin and voice coil It can be set that a limited gear 2 is formed.
As a result, the magnetic flux density can be increased and the efficiency can be improved, and
the gap formed as described above becomes uniform over the entire circumference, the magnetic
flux distribution becomes uniform, and distortion and the like can be reduced. It can be done.
(Embodiment) An embodiment of a dome-shaped speaker according to the present invention will
be described based on FIGS. 1 to 4. FIG. 1 is a cross-sectional view of the dome-shaped speaker
showing a basic form, and FIG. FIG. 3 is a partial cross-sectional view showing an example in
which a notch is provided in the lower part of the step portion which is an engaging portion, and
FIG. 4 is a predetermined height of nonmagnetic material around the center pole as an engaging
portion. It is sectional drawing at the time of arrange | positioning a pipe and a ring. In the figure,
l is an external magnet type magnetic circuit unit, which includes a yoke 2. センターポール3.
The magnet 4 and the top plate 5 are configured. The reference numeral 10 denotes a vibration
system, and a dome-shaped diaphragm 11, a coil bobbin portion 12.1 and an edge portion 13
extending from the lower end portion of the coil povin 12 in the direction of water. ボイスコイル
14からなっている。 In the present invention, basically, the dome-shaped diaphragm 11 and
the coil bobbin portion 12 and the knee 7 screw portion 13 extending in the horizontal direction
are integrally formed at the lower end portion thereof, and the magnet of the inner peripheral
edge of the top plate 5 is formed. A guide portion for arranging an edge on a portion located on
the 4 side, that is, the lower inner peripheral edge. In the embodiment, the step portion 6a is
formed, and the outer peripheral edge 15 of the L edge portion 13 is fitted to the guide portion 6
and is sandwiched by the edge pressing members 1B and I6 formed of a flexible member etc. The
magnetic circuit portion 1 is assembled by closely fitting a part of the guide portion 6 (in the
embodiment, the lower end inner peripheral edge of the step 8a to the engagement i'1 1 17
provided on the upper outer peripheral edge of the center pole 3). The arrangement of the
vibration system 10 at a predetermined position is performed simultaneously. As a result, the
magnetic gap 8 is formed without using a jig or the like, and the voice coil 14 is automatically
disposed in the magnetic gap 8 in a correct position. -Various means are possible as a form which
provides the above-mentioned engaging part 7, In the example shown in JSlliN and FIG. 2, the
step part 3a is formed in the upper outer periphery of the center pole 3, It is assumed to be 7.
When closely fitting the lower end edge of the step portion 8a of the top plate 5 to the outer
peripheral edge of the step portion 3a, in the embodiment, the fitting depth is dimensioned to be
about 0.5 ms. In the example of FIG. 3, the notch 9 is formed in the lower part of the stepped
portion 3a of the center pole 3 marked 1-so that the stepped portion 3a is formed into a flange
shape.
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This is an increase in the magnetic resistance of B3a. In the example of FIG. 4 (A), a pipe 3b of a
predetermined height made of a nonmagnetic material is fitted around the outer periphery of the
center pole 3, and FIG. 4 (B) is a ring 3c of nonmagnetic material. The upper end outer peripheral
edge is the engaging portion 7. [The two holding portions 7 may be provided at partial positions
(at least two positions) at symmetrical positions around the center pole circle, whereby the top
plate 5 may be partially fixed. Is a positioning step formed on the L surface of the yoke 2 and the
centering accuracy of the magnet 4 is increased by 11 if the inner peripheral edge of the magnet
4 is positioned on the step In the figure, 17 is a frame. Next, to describe an assembly example,
the edge 13 is fitted into the step 6 d of the top plate 5 via the edge holding member 16 and the
edge 13 is further held by another edge holding member 1 B. When fitting the edge portion 13
to the step 6a, the diaphragm is automatically centered because the outer peripheral edge is
guided by the step back wall. 0 Next, the magnet member 4 is attached to the yoke 2 After
placing a, the inner peripheral edge at the lower end of the L-step 6a is positioned in the holding
portion 7 provided on the center pole 3 and press-fit. As a result, the magnet member 4 is held
between the yoke 2 and the top plate 5 and fixed at the inner peripheral edge of the lower end of
the top plate 5 closely to the engaging portion of the center pole 3 so that the top plate is
properly fixed. A predetermined magnetic gap 8 can be formed without using a jig or the like,
and the voice coil 14 is automatically disposed at a predetermined position in the magnetic gap
8. When the magnet member 4 is magnetized in the assembled state as shown in L, the yoke 2
and the top plate 5 are attracted and fixed more firmly. Although the dome-shaped speaker with
the above-mentioned configuration is of the closed type on the back side of the diaphragm, it
should be used as a pack pressure by providing the center pole 3 with a horn cavity B as shown
in phantom in FIG. You can also. According to the dome-shaped speaker according to the present
invention, the magnet member is disposed in the yoke L, and the edge portion of the domeshaped diaphragm is fitted to the guide portion formed on the top plate in a state of being
sandwiched by the edge pressing member The magnet member is held between the yoke and the
top plate by positioning and fitting a part of the guide portion of the top play 1 into the engaging
portion provided on the outer periphery of the center pole, and the top plate A part of the guide
portion is closely fitted to the engaging portion of the center pole to fix the top plate properly,
while the diaphragm is in a state in which the outer peripheral end of the edge portion is guided
by the back wall of the guide portion Since the voice coil is properly set in the gap and the edge
is clamped by the edge pressing member, the formation of the magnetic gap and Distribution l'g
kinematic plate be made accurately.
In addition, when assembling as described above, no adhesive is required and there is no time
loss for drying and solidification, as well as the assembling process can be simplified, and
furthermore, the formation of the magnetic gap and the diaphragm There is no need for jigs and
the like for the centering arrangement of the frame, so there is no need for setting unnecessary
gap intervals, and when dimensioning for setting the magnetic gap, the minimum cap necessary
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for moving the coil bobbin and voice coil is formed. Can be set to As a result, the magnetic flux
density can be increased and the efficiency can be controlled, and the gears and gears formed as
described above become uniform over the entire circumference, and the magnetic flux
distribution becomes uniform, causing distortion, etc. Can be reduced.
[0002]
Brief description of the drawings
[0003]
1 to 4 show an embodiment of a dome-shaped speaker according to the present invention, and
FIG. 1 is a sectional view of the dome-shaped speaker showing a basic form, FIG. 2 is an enlarged
sectional view of the same portion, FIG. The figure is a partial cross-sectional view showing an
example in which a notch is provided in the lower part of the step portion which is the engaging
portion, and FIG. 4 shows a nonmagnetic magnetic pipe or ring of a predetermined height
disposed around the center pole It is sectional drawing of a case.
The fifth [, 4 (A), (B) show a conventional dome-shaped speaker, (A) is a cross-sectional view, (B)
is a partially enlarged cross-sectional view. 1: Magnetic circuit portion 2: Yoke 3: Central pole 4:
Magnet 5: Top plate 6: Guy upper portion 8a = step as a guide portion 7: Holding portion 8:
Magnetic cap 10: Vibration system
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