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DESCRIPTION JPH0974599

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DESCRIPTION JPH0974599
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus using a speaker having two diaphragms.
[0002]
2. Description of the Related Art In a general sealed speaker apparatus, a single speaker is
disposed in a sealed cabinet, but when the speaker is driven in such a cabinet, the diaphragm of
the speaker is an enclosed space of the sealed cabinet. Because the low frequency characteristics
of the output sound pressure depend on the space volume of the cabinet due to the change of the
stiffness component of the back pressure, the cabinet having a sufficiently large space volume of
the cabinet is selected.
[0003]
However, considering the installation conditions etc., it is difficult to design a sufficiently large
bass reproduction cabinet that satisfies the above conditions. For example, compared with the
lowest resonance frequency of a single speaker, this speaker is disposed in the cabinet The
lowest resonant frequency is significantly increased.
In order to eliminate such an adverse effect, for example, Japanese Utility Model Application
Publication No. 6-35595 discloses a combined type direct radiation speaker device and the like.
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1
[0004]
The structure of the speaker and the speaker device disclosed in the above-mentioned
publication will be described with reference to FIGS. FIG. 5 is a side sectional view of a single
speaker disposed in a closed cabinet, FIG. 6 is a side sectional view of a composite direct
emission speaker device in the cabinet, and FIG. 7 is a composite direct emission showing
another configuration It is a side sectional view of a type speaker device.
[0005]
First, a conventional low-mid range speaker will be described with reference to FIG. In FIG. 5,
reference numeral 10 denotes a speaker unit. In the speaker unit, 11 is a disk-like yoke, and a
columnar pole piece 11a is formed to project from the central portion of the yoke. A ring-shaped
magnet 12 is disposed on the flange portion of the yoke 11 and is fixed via an adhesive or the
like. Reference numeral 13 denotes a ring-shaped plate, which is adhesively fixed on the magnet
12 so that a gap G, which is a magnetic path, is formed between the ring plate and the pole piece
11a.
[0006]
The yoke 11, the magnet 12, the plate 13 and the pole piece 11a form a magnetic path via the
gap G to form a magnetic circuit of the speaker. A frame 14 such as a funnel-shaped metal is
fixed to the upper side of the plate 13.
[0007]
A voice coil 16 is wound around a cylindrical bobbin 15 made of paper, synthetic resin or the
like, and an audio current or the like is supplied. The voice coil 16 is held by the damper 17 so as
to freely swing in the vertical direction in the magnetic circuit gap G. The damper 17 is provided
with a central hole having an inner diameter joined in contact with the outer shape of the bobbin
15 at the center, a concentric cross-sectional corrugated portion is formed, and an outer
peripheral portion thereof is joined to the frame 14.
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2
[0008]
The inner diameter portion of the funnel-shaped diaphragm 18 is joined to the upper end of the
outer diameter of the bobbin 15 and the opening is concentrically formed on the outer periphery
of the opening of the frame 14 through an edge 19 having a circular arc shape in cross section
integrally formed with the diaphragm 18 It adheres with formed arrow 20 grade. Reference
numeral 21 denotes a tinsel wire connected to the voice coil 16 and connected to a terminal 22
disposed in an insulating manner on the frame 14. Reference numeral 23 denotes a dome-shaped
dust cover, which is joined to the diaphragm 18 or the like.
[0009]
Two such speaker units 10 are disposed in a sealed cabinet 1 as shown in FIG. 6 to constitute a
composite direct emission speaker device.
[0010]
That is, in the opening formed in the front of the cabinet 1 in FIG. 6, the main speaker 10 and its
diaphragm 18 for emitting acoustic radiation directly to the outside are disposed, and the inside
of the cabinet 1 is directed to the back of the main speaker 10 The auxiliary speaker 10A and the
diaphragm 18A attached thereto are disposed.
The enclosed space between the main speaker 10 and the auxiliary speaker 10A in the cabinet 1
is the first air chamber 2, and the enclosed space in the back of the auxiliary speaker 10A in the
cabinet 1 is the second air chamber 3. .
[0011]
When driving the main and auxiliary speakers 10 and 10A in such a composite direct radiation
speaker device, the resonance frequency determined as the auxiliary speaker 10A and the second
air chamber 3 is made to coincide with the lowest resonance frequency of the main speaker 10,
When the first and second diaphragms 18 and 18A are driven in phase, a speaker device which
does not cause a pressure change in the first air chamber 2 can be obtained.
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[0012]
SUMMARY OF THE INVENTION In the above-described speaker apparatus, the resonance
frequency determined by the auxiliary speaker 10A and the second air chamber 3 is mainly
determined in order to maintain the minimum resonance frequency of the main speaker 10 of
the cabinet 1. There is a disadvantage that sufficient bass reproduction can not be performed
unless the volume of the second air chamber 3 is sufficiently large, which must be matched with
the lowest resonance frequency of the speaker 10.
[0013]
In order to eliminate such an adverse effect, as shown in FIG. 7, it is possible to expand the
volume of the second air chamber 3 while keeping the entire volume of the cabinet 1 constant,
and a composite direct radiation speaker device capable of performing sufficient bass
reproduction. Also disclosed is a configuration in which the main speaker 10 and the auxiliary
speaker 10A are attached to the open acoustic pipe 4 in order to obtain the above.
[0014]
However, in the configuration as shown in FIG. 7 described above, a main speaker and an
auxiliary speaker are required, and a sub baffle plate 5 for attaching the auxiliary speaker 10A
and an open acoustic pipe are required in the cabinet 1 and a general cabinet is used. There was
a problem that I could not do.
Furthermore, the lowest resonance frequency defined by the volumes of the auxiliary speaker
10A and the second air chamber 3 must be matched with the lowest resonance frequency of the
main speaker 10, but the volume of the second air chamber 3 in the cabinet 1 is an open
acoustical The volume of the second air chamber 3 in the cabinet 1 is also reduced because the
volume is reduced by the volume of the tube 4, and a small auxiliary speaker 10A having a high
minimum resonance frequency must be used as the auxiliary speaker 10A. There was a problem
that it could not be done.
[0015]
The present invention has been made to solve the above-mentioned problems, and the problem is
that the cabinet can be simplified without requiring a plurality of speakers, and a general cabinet
can be used. It is an object of the present invention to reduce the volume between two
diaphragms in a speaker configuration and obtain a speaker apparatus capable of low frequency
reproduction with a small speaker.
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[0016]
The speaker apparatus of FIG. 2 according to the present invention has a first diaphragm 27
formed between the first voice coil 26 disposed in the magnetic circuit gap G and the outer
periphery of the frame 14. And a second voice coil 29 disposed inside the first voice coil 26 and
a speaker 25 having a second diaphragm 30 formed between the position protruding from the
outer periphery of the frame 14 and the speaker 25 A cabinet 1 having a mounting hole is
provided, a first diaphragm 27 is disposed in the cabinet 1, and one end of a second diaphragm
30 is disposed outward projecting from the mounting hole 34 of the cabinet 1 The
[0017]
According to the speaker device of the present invention, a simplified general cabinet can be
used which does not use a sub-baffle or an open acoustic tube, and does not require two
speakers, between the first and second diaphragms. Since the volume of the air chamber can be
reduced, a speaker device can be miniaturized.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a speaker device
according to the present invention will be described in detail below with reference to FIGS.
FIG. 1 is a side sectional view showing the outline of the speaker device of the present invention,
FIG. 2 is a side sectional view of the speaker used in the speaker device of the present invention,
and FIG. 3 is a low frequency characteristic curve of the present invention and the prior art. .
[0019]
First, the configuration of the loudspeaker 25 used in the loudspeaker apparatus of this
embodiment will be described with reference to FIG.
The parts corresponding to those in FIG. 5 are denoted by the same reference numerals.
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5
[0020]
In the speaker unit 25 of this embodiment, the yoke 11 is formed in a disk shape, and a columnar
pole piece 11a is formed in a projecting manner at the central portion thereof.
A ring-shaped magnet 12 is disposed on the flange portion of the yoke 11 and is fixed via an
adhesive or the like.
Reference numeral 13 denotes a ring-shaped plate, which is adhesively fixed on the magnet 12
so that a gap G, which is a magnetic path, is formed between the ring plate and the pole piece
11a.
[0021]
The yoke 11, the magnet 12, the plate 13 and the pole piece 11a form a magnetic path via the
gap G to form a magnetic circuit of the speaker.
A frame 14 such as a funnel-shaped metal is fixed to the upper side of the plate 13.
[0022]
A first coil L1 is wound around a cylindrical first bobbin 26a made of paper or synthetic resin or
the like, and an audio current or the like is supplied. The first voice coil 26 is held by the damper
17 so as to freely swing in the vertical direction within the gap G of the magnetic circuit. The
damper 17 has a central hole having an inner diameter joined in contact with the outer shape of
the bobbin 26 a at the center, a concentric wave section is formed concentrically, and an outer
peripheral portion thereof is joined to the frame 14.
[0023]
The inner diameter portion of the funnel-shaped first diaphragm 27 is joined to the upper end of
the outer diameter of the bobbin 26a, and the opening is a frame through the first edge 28
having a circular arc shape integrally formed with the first diaphragm 27. It is fixed by a
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6
cylindrical member 33 concentrically formed on the outer peripheral edge of the opening 14.
[0024]
The first diaphragm 27 and the cylindrical member 33 may select a highly airtight material such
as a synthetic resin, and the cylindrical member 33 may select, for example, elastic rubber or the
like like a gasket.
[0025]
The first tinsel wire 21 used for the first diaphragm 27 is connected to the coil L 1 of the first
voice coil 26 and is connected to the first terminal 22 disposed in an insulating manner on the
frame 14.
[0026]
A method of assembling such a first diaphragm 27 is a voice coil assembled by the same method
as that of FIG. 5 and inserted between the inner diameter of the first bobbin 26a of the first voice
coil 26 and the pole piece 11a after drying. The spacer is removed from the pole piece 11a, and
the second voice coil spacer is inserted between the inner diameter of the second bobbin 29a of
the second voice coil and the outer diameter of the pole piece 11a. The second damper 32 of the
second voice coil 29 is fixed between the bobbin outer periphery and the first diaphragm 27 with
an adhesive or the like.
[0027]
Next, the lead wire of the second coil L2 of the second voice coil 29 is wound and soldered to the
second tinsel wire 21A at the intermediate position of the second diaphragm 30, and the lead
wire is subjected to the second vibration Bond along the plate 30.
Next, the inner diameter of the diaphragm 30 with the second funnel-shaped second edge 31 is
bonded to the upper outer periphery of the second bobbin 29a of the second voice coil 29, and
the outer periphery of the second diaphragm 30 is cylindrical It adheres to the circumferential
upper surface of the ring-shaped member 33 through a ring-shaped arrow 20 or the like.
[0028]
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The second terminal 22A for input of the second tinsel cord 21A is attached to the cylindrical
member 22A or the frame 14 or the like.
When the adhesive dries after the assembly, the second voice coil spacer is removed, the dust
cover 23 is adhered to the second diaphragm 30, and finally the magnet 12 is formed as shown
in FIG. A speaker is completed by magnetizing with N.
[0029]
In the speaker device 36 of this embodiment, as shown in FIG. 1, such a speaker unit 25 is
provided with a magnet 12 inside the outer peripheral portion of the frame 14 or the inside of
the sealed box in which the mounting holes 34 are formed in the baffle plate in front of the
cabinet 1 The first diaphragm 27 and the like are inserted and fixed to the baffle plate, and the
cylindrical member 33 and the second diaphragm 30 are in contact with the outside of the
cabinet 1 and the other attachment portion of the second diaphragm 30 is It is made to project
outward and attach it.
[0030]
Therefore, there is no need to attach two main and auxiliary speakers as in the conventional
configurations shown in FIGS. 6 and 7, and the structure of the cabinet 1 is also complicated by
providing a main baffle plate and a sub baffle plate and providing an open acoustic pipe. It is
possible to use a general simplified cabinet without the need for a closed box of various
configurations.
Furthermore, the volume of the cabinet 1 is increased as much as there is no sub baffle plate or
open sound tube, and the low frequency characteristic of the speaker is improved.
[0031]
Also, the speaker unit 25 of this example is selected so that the air chamber 35 formed between
the first and second edged diaphragms 26 and 29 can maintain sufficient air tightness, and the
volume is as small as possible. The change in the stiffness of the air in the cabinet 1 is applied to
the first diaphragm 27 because the second diaphragm 30 is disposed outside the cabinet 1 so
that the lowest resonance frequency hardly changes. The lowest resonance frequency can be
kept low.
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[0032]
FIG. 3 shows frequency characteristic curves in the vicinity of the low band resonant frequency
of the speaker device of this embodiment described above and the conventional speaker device
described in FIG. 6, where the horizontal axis represents frequency (Hz) and the vertical axis
represents level (dB). And the characteristic curve shown by the broken line 41 in the
conventional example shows the present invention, and it is understood that the low resonance
frequency f0 is lowered to about 70 Hz as compared with the conventional 110 Hz.
[0033]
FIG. 4 shows another configuration of the speaker of the present invention.
In the case of FIG. 4, two first and second stepped portions 42 and 43 are formed on the outer
peripheral portion of the frame 14 in the case of FIG. The outer peripheral portion of the first
diaphragm 27 is adhered to the first step 42 via the arrow or gasket 20A, and the outer
peripheral portion of the second diaphragm 30 is formed via the arrow 20 to the second stepped
portion 43. The lead wire of the second coil L2 wound around the second voice coil 29 is bonded
to the second voice coil 29 through the through hole 11b bored in the pole piece 11a to the
input terminal 22A on the lower surface of the yoke 11 21A, and the diameter of the mounting
hole 34 formed in the baffle plate of the cabinet 1 where the cylindrical member 33 can be
omitted is approximately the diameter of the funnel-like outer diameter portion of the step
portion of the frame 14 Equally selected.
The other configuration is the same as that of FIG.
[0034]
According to the speaker apparatus of the present invention, a simplified general cabinet can be
used which does not use a sub-baffle or an open acoustic tube, and the first and the second do
not require two speakers. Since the volume of the air chamber between the two diaphragms can
be reduced, the loudspeaker apparatus can be miniaturized, and a loudspeaker apparatus in
which an increase in the minimum resonance frequency on the first diaphragm side is
suppressed can be obtained.
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[0035]
Brief description of the drawings
[0036]
1 is a side sectional view showing an outline of the speaker device of the present invention.
[0037]
2 is a side sectional view of the speaker showing an embodiment of the present invention.
[0038]
3 is a low frequency characteristic curve comparison diagram of the present invention and a
conventional speaker device.
[0039]
4 is a side sectional view of a speaker showing another embodiment of the present invention.
[0040]
5 is a side sectional view of the conventional speaker.
[0041]
6 is a side sectional view of the conventional speaker device.
[0042]
7 is another side sectional view of the conventional speaker device.
[0043]
Explanation of sign
[0044]
DESCRIPTION OF SYMBOLS 1 Cabinet 14 Frame 27 1st diaphragm 30 2nd diaphragm 33
Cylindrical member
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