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JPH0879883

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Notice
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 JPH0879883
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of a dome-shaped speaker, and in particular, the magnetic circuit component is also
used as a speaker mounting flange, and the front decorative plate is also used as a diaphragm
fixing member. The present invention relates to a dome-shaped speaker in which the mounting
means of the decorative plate is extremely simplified.
[0002]
2. Description of the Related Art A typical structure of an electrodynamic loudspeaker in the
prior art is formed in a magnetic circuit consisting of a pole 1 and a lower plate 2, a ring magnet
3 and an upper plate 4 as shown in FIG. The speaker main body having a structure in which the
voice coil 9 coupled to the dome-shaped diaphragm 8 supported by the edge 7 is inserted into
the annular magnetic gap 5, the dome-shaped diaphragm 8 is an upper surface of the upper plate
4 On the inner side of the guide projection 4c for positioning the diaphragm formed on the upper
surface of the upper plate 4 is held at a predetermined position on the upper plate 4 in
combination with a screw or the like for attachment, if necessary.
[0003]
A mounting flange 10 in which a central hole 10a in which a diaphragm 8 is exposed at the
center is drilled and a front decorative plate 11 are fixed to a front surface of the speaker main
body by a mounting screw 12.
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[0004]
The conventional speaker with such a structure has a cross section as shown in FIG. 6 and is for
attaching the speaker to the cabinet separately from the speaker main body made of an
electroacoustic transducer. The mounting flange 10 must be fixed to the magnetic circuit, and
furthermore, the front decorative plate 11 also needs to be mounted with a screw or the like, the
number of parts is also large, and the work time in the assembly process There was a drawback
that needed a lot.
[0005]
Therefore, the present invention solves the disadvantages of the above-mentioned prior art,
combines the mounting flange with the magnetic circuit component, and devises the shape of the
front decorative plate. Intended to provide.
[0006]
[Means for Solving the Problems] The loudspeaker according to the present invention for
achieving the above object will be described using the embodiment shown in FIGS. 1 to 5; As
shown in FIG. 1 showing the cross section of the embodiment and FIGS. 2 and 3 showing the
magnetic circuit of the speaker main body and FIGS. 4 and 5 showing the front decorative plate,
the pole 1 and the lower plate 2, the ring magnet 3 and An electrodynamic dome-shaped speaker
having a structure in which a voice coil 9 coupled to a dome-shaped diaphragm 8 supported by
an edge 7 is inserted into an annular magnetic air gap 5 formed in a magnetic circuit comprising
an upper plate 4 The upper plate 4 is extended from the outer diameter of the ring magnet 3 and
has an outer diameter longer than the outer diameter of the ring magnet 3 and an inner diameter
shorter than the outer diameters of the plurality of mounting holes 4a and the ring magnet 3 in
the periphery. A plurality of fan-shaped holes 4b having a diameter and A guide projection 4c for
positioning the diaphragm 8 concentrically arranged with the magnetic gap 5 is formed on the
upper surface inside the fan-shaped hole 4b while being bored concentrically with the magnetic
gap 5, and the outermost diameter is the fan shape A central hole 6b larger than the outer
diameter of the hole 4b and exposing the diaphragm 8 is formed in the center, and is hooked on
the outer diameter portion of the fan-shaped hole 4b on the back near the outer peripheral
portion and locked to the upper plate 4 And the front decoration plate 6 also serving as a
retainer for holding the diaphragm 8 having the ridge-shaped projections 6a formed thereon, and
by hooking the ridge-shaped projections 6a onto the outer diameter portion of the fan-shaped
hole 4b In addition to being fixed to the plate 4, the diaphragm 8 is also pressed and fixed at the
peripheral portion of the central hole 6b.
[0007]
In the dome-shaped speaker having such a configuration, the upper plate 4 constituting the
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magnetic circuit is extended from the outer diameter of the ring-shaped magnet 4, and a plurality
of mounting holes 4a are formed in the periphery. Since it is provided and has the function of a
mounting flange, a separate mounting flange is not necessary like a conventional dome-shaped
speaker.
[0008]
As in the prior art, there is no need for an operation for attaching the mounting flange to the
speaker body and a member for attaching a screw or the like.
[0009]
Further, in the upper plate 4, a plurality of fan-shaped holes 4 b having an inner diameter shorter
than the outer diameter of the ring magnet 3 and an outer diameter longer than the outer
diameter of the ring magnet 3 are concentric with the magnetic gap 5. Since it is drilled, the
leakage flux from the magnetic circuit is small and the efficiency of the ring magnet 3 is
increased.
[0010]
Further, on the back surface of the outer peripheral portion of the front decorative plate 6, a
wedge-shaped projection 6a for hooking on the outer diameter portion of the fan-shaped hole 4b
to engage with the upper plate 4 is formed. The front decorative plate 6 is fixed to the upper
plate 4 and the diaphragm 8 is also pressed and fixed at the peripheral portion of the central
hole 6b by hooking to the outer diameter portion of the fan-shaped hole 4b. 6 is not necessary
for the work of reattaching to the speaker main body or the mounting flange and a member for
attaching a screw or the like.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The preferred embodiment of the
present invention will be described in detail with reference to FIG. 1 showing the cross section of
the present invention and FIGS. As is well known, a voice coupled to a dome-shaped diaphragm 8
supported at an edge 7 in an annular magnetic air gap 5 formed in a magnetic circuit consisting
of a pole 1 and a lower plate 2, a ring magnet 3 and an upper plate 4. It has a configuration of an
electrodynamic dome-shaped speaker in which a coil 9 is inserted.
[0012]
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Referring to FIG. 2 showing the upper surface of the speaker main body from which the
diaphragm 8 has been removed, and FIG. 3 showing the side cross section, in the magnetic circuit
of the main body, the upper plate 4 is outside the ring-shaped magnet 3. A plurality of fanshaped holes 4b extended from the diameter and having a plurality of mounting holes 4a, an
inner diameter shorter than the outer diameter of the ring magnet 3 and an outer diameter
longer than the outer diameter of the ring magnet 3 A guide projection 4c for positioning the
diaphragm 8 concentrically arranged with the magnetic gap 5 is formed on the upper surface
inside the fan-shaped hole 4b while being bored concentrically with the magnetic gap 5.
The guide projections 4c can be formed easily and precisely by semi-blanking the back surface of
the upper plate 4.
[0013]
The reference numeral 6 denotes a front decorative plate having a central hole 6b whose
outermost diameter is larger than the outer diameter of the fan-shaped holes 4b and in which the
diaphragm 8 is exposed at the center. A hook-shaped projection 6 a is formed to be hooked on
the outer diameter portion of the fan-shaped hole 4 b of the upper plate 4 to be locked to the
upper plate 4.
The wedge-shaped projection 6a is integrally molded of synthetic resin together with the front
decorative plate 6 and has elasticity capable of being deformed against an external force.
[0014]
The outside of the central hole 6b is in the form of an outwardly opened horn to prevent
resonance of the sound wave, and the back surface is dimensioned to be in contact with a portion
outside the diaphragm 8 edge 7 at the time of mounting. A ring-shaped protrusion 6c is formed
on the
[0015]
Further, on the back side, the fan-shaped holes 4b are inserted into the fan-shaped holes 4b and
abut on the end edges of two adjacent fan-shaped holes 4b. A positioning projection 6d for
positioning in the direction is formed.
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[0016]
In assembling the speaker, the diaphragm is placed and fitted in the guide projection 4c on the
upper surface of the upper plate 4 of the speaker main body, and the front decorative plate 6 is
formed into a predetermined position direction from above. When the positioning projections 6d
are made to approach the upper plate 4 while being in contact with the end edges of the two
adjacent fan-shaped holes 4b, the wedge-shaped projections 6a are formed by the outer diameter
edge of the fan-shaped holes 4b. When it is inserted into the fan-shaped hole 4b while being bent
inward and the front decorative plate 6 comes in close contact with the upper plate 4, the wedgeshaped projection 6a returns outward due to elasticity, and at this time, the wedge-shaped
projection 6a rises It is caught on the back of the plate 4 and fixed to the top of the speaker
body.
At the same time, the diaphragm 8 is also pressed and fixed by the ring-shaped projection 6c of
the central hole 6b, and a dome-shaped speaker is completed.
[0017]
As another embodiment, regarding the positioning of the front decorative plate 6, although not
shown, a cut-out portion in which the wedge-shaped projection 6a is fitted is provided at the
outer diameter edge of the fan-shaped hole 4b. In the above, the positioning projection 6d can be
omitted by hooking the wedge-shaped projection 6a.
[0018]
Further, when the front decorative plate 6 is attached, even if the position of the center hole 6b is
in a convenient dimensional relationship for diaphragm pressing even without the ring-like
projection 6c formed on the back side, the ring-like projection 6c is not enough to set.
[0019]
Although the speaker according to the present invention has been described in detail based on
the embodiment considered to be representative, the embodiments of the vibration system and
the magnetic circuit system of the speaker according to the present invention are limited to the
structure of the above embodiment. Rather, they can be appropriately modified and implemented
as long as they have the configuration requirements described in the above-described claims,
exhibit the effects of the present invention, and have the effects described below.
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[0020]
The speaker according to the present invention has the following effects.
[0021]
(1) The conventional dome shape because the upper plate constituting the magnetic circuit is
extended from the outer diameter of the ring magnet and a plurality of mounting holes are
formed in the periphery to have the function of the mounting flange A separate mounting flange
as the speaker is not necessary.
Therefore, the manufacturing cost can be reduced because the cost for mounting components
such as parts for mounting flanges and screws and the like and the mounting work cost are not
required.
[0022]
(2) The upper plate has a plurality of fan-shaped holes having an inner diameter shorter than the
outer diameter of the ring magnet and an outer diameter longer than the outer diameter of the
ring magnet, and a central hole forming a magnetic gap Being concentrically drilled, the
substantial outer diameter of the upper plate for the magnetic circuit is smaller than the outer
diameter of the ring magnet, and as a result, the leakage flux from the magnetic circuit is small,
and as an external magnet type magnetic circuit The use efficiency of the ring magnet is high.
Thus, economic design is possible.
[0023]
(3) Since the leakage flux is small, the adverse effects on magnetically sensitive peripheral
devices are small.
[0024]
(4) In addition, when attaching the front decorative plate, it is fixed to the upper plate by hooking
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a wedge-shaped projection on the outer diameter portion of the fan-shaped hole, and at the same
time the diaphragm is also a ring around the central hole. Since it is pressed and fixed by the
projection, an operation for reattaching the front decorative plate and the diaphragm to the
speaker main body or the mounting flange and a member for attaching a screw or the like are
unnecessary.
Therefore, the manufacturing cost can be reduced.
[0025]
The above advantages have the effect of being able to provide at a low cost a speaker which is
excellent in performance, stable in operation and easy to manufacture.
[0026]
Brief description of the drawings
[0027]
1 is a cross-sectional view of an embodiment of the speaker of the present invention.
[0028]
2 is a top view of the magnetic circuit portion.
[0029]
3 is a side sectional view of the magnetic circuit portion.
[0030]
4 is a rear view of the front decorative plate.
[0031]
5 is a side sectional view of the front decorative plate.
[0032]
6 is a cross-sectional view of a conventional speaker.
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[0033]
Explanation of sign
[0034]
DESCRIPTION OF SYMBOLS 1 pole 2 lower plate 3 magnet 4 upper plate 4 a mounting hole 4 b
fan-shaped hole 4 c guide projection 5 magnetic gap 6 front decorative plate 6 a wedge-shaped
projection 6 b center hole 6 c ring-shaped projection 6 d positioning projection 7 edge 8
diaphragm 9 voice coil
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