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JPS57166488

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DESCRIPTION JPS57166488
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of a ribbon type speaker according to the present invention, FIG. 2 is a cross-sectional view seen
from line -H of FIG. 1, and FIG. FIG. 7 is a cross sectional view showing a modification of a part of
the embodiment shown in FIG. 2 and FIG. 2, and FIG. 4 is a cross sectional view showing another
embodiment. 3, 3a, 3b ······ Diaphragm, 5 · · · · · · · · Back cover, 6 · · · · · · · · · · · · · · · · · · · · · vibration
isolation material, g, g + G2 ..... Magnetic gap. Figure 3 Figure 4
DETAILED DESCRIPTION OF THE INVENTION In the present invention, the vibration isolation
plate is disposed in the magnetic gap of the magnetic circuit and the signal current is flowed to
vibrate the diaphragm to emit sound: IjI! I opened the speaker? i・するものである。 Such a
speaker generally comprises a back cover for covering behind the diaphragm for sealing and
sound absorption, and a rounding matching transformer for matching the electrical impedance
between the diaphragm and the signal line. However, the above-mentioned back cover is vibrated
by the sound pressure behind the diaphragm of the speaker itself or the sound pressure from the
outside generated by other speakers, which causes generation of intermodulation distortion and
the like, thereby deteriorating the sound quality. You will come to The deterioration of the sound
quality also occurs when the core of the matching transformer vibrates. Then, in order to
measure the vibration isolation of the back cover, it may be considered to attach a vibration
isolation material such as felt or go-5 to the cover with the rigidity of the cover itself enhanced.
In addition, as a method of measuring the vibration of a single transformer, such as: λ, ·,
impregnation of varnish, placing a transformer in a special case, filling a gap with a vibrationproof material such as pitch, floating the whole with Kushiron, etc. Conceivable. However, in any
of the above-described methods, since the pack cover and the transformer are each separately
damped, they can not be said to be effective, and cause cost increase. The present invention has
been made in view of the above-mentioned point and is good. The purpose of the present
invention is to provide a ribbon type speaker whose cost is reduced by simultaneously
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performing vibration isolation of the back cover-2 transformer in processing K. . An embodiment
of the present invention will be described below with reference to the drawings. Figure 1 and
Figure 2 A ribbon-shaped spy according to the invention? An example of one power is shown.
The main body of the illustrated speaker is formed between a pair of opposing portions of the
yoke 20 joined so as to sandwich the magnet 1, and the diaphragm 3 is arranged so as to be
freely oscillated in the magnetic gap g in a magnetic circuit having a magnetic field. The
diaphragm 3 is made of a single conductive metal foil such as aluminum foil or beryllium foil.
The main body of the speaker is housed in the back cover 5 so that the opening of the pack cover
5 is closed by the horn 4 fixedly attached to the upper surface of the yoke 2 and the back of the
diaphragm 3 is sealed by the pack cover 5 It is done. At both ends of the diaphragm 3, lead wires
@ turtle and 6b 115 / 4ν of the rounds of supply of the matching transformer 8 fixed to the
pack cover sohm are respectively connected electrically.
Fixing of the matching transformer 6 to the pack cover 5 is performed by filling the gap between
the pack cover 5 and the matching transformer 6 with a vibration-proof material 7 such as an
adhesive or a dumping agent. Note that 8 is a sound absorbing material. As described above, the
same effect as increasing the thickness of the bottom of the pack cover 5 is obtained as in the
case where the vibration insulating material 1 is filled, and the vibration of the pack cover 5 is
reduced. As well as being scaled, the transformer 6 is also surrounded by the damping material T
so that the damping of its core is also measured simultaneously. In the embodiment described
above, only the bottom surface of the cover 50 to which the transformer 6 is attached is isolated.
However, as shown in FIG. 3, the pack cover 5 is divided into two halves, 5 turtles and 5b, and
the transformer 6 is attached. The whole surface of the pack cover 5 can also be damped by
injecting the damping material T 'on the inner side surface of the (non-cover) portion 5b. FIG. 4
shows an example of a complex type loudspeaker having a ribbon type loudspeaker main body
having two diaphragms 3 嶋 and 3b as a driver. In the speaker main body of this embodiment, a
center pole 10 'standing from the center of the back play 10 joined to one surface of the pair of
magnets 1 is positioned between the magnets 1, and the center pole 10 & the magnet 1 In order
to form a magnetic gap g1 and g between the top plate 11 joined to the other surface of the
frame, the Kal air circulation passage is formed, and the above magnetic 21! Gap g. And g, the
diaphragm 3 turtle and 3 'b are attached to the magnetic circuit so that the diaphragm 3 turtle
and 3 b are respectively disposed. A) Condensed ring type speaker is configured to seal the front
sides of the diaphragms 3m and 3b and to emit sound from the back side, leaving a part of the
back plate 10 around the center ball 10 turtle to make a sound hole 10b is worn. Then, a back
cover 5 whose opening is closed by the top plate 11 is attached to the speaker main body so as
to seal the back of the diaphragm 3 turtle and 3b. As understood from FIG. 4, in this example, the
speaker main body is not accommodated in the back cover 5, and only the matching transformer
6 installed at the bottom portion is accommodated. The matching transformer 6 is fixed by filling
the anti-vibration material T between the gap and the back cover 5 by filling the anti-vibration
material T, and is connected to the diaphragms 3 & 3bK via the lead wires 6 '. ). , @ -A, 12 is an
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equalizer provided on the sound path between the diaphragms 3 & 3 b and the sound hole 1 (Ib.
Although a general-purpose, loudspeaker-type speaker has a structure in which the back cover is
easily vibrated by the influence of the sound pressure behind the diaphragm, the vibration
isolation that also serves as vibration isolation of the matching transformer 6 installed at the
bottom Since the material 7 is filled in the back cover 5, the vibration of the back cover 5 can be
prevented. In the embodiment described above, the matching transformer 6 is embedded in the
pack cover 5 by filling the anti-vibration material T into the back cover 5 and the anti-vibration
material 1 which are made of different materials. However, the back cover 5 itself may be formed
of the vibration-proof material 1 and the transformer 6 may be embedded in the cover 5 at the
same time as the formation. In fact, sufficient effects can be obtained even if the transformer 6 is
not completely hidden in the anti-vibration material. In the above description, the material of the
pack cover 5 and the installation method of the transformer 6 were not specified, but the pack
cover 5 is formed of a heat conductive metal material such as aluminum or nonmagnetic
stainless steel, and the core of the transformer 6 Directly or by attaching an insulating sheet with
a small thermal resistance to the pack cover 5], it is possible to prevent the temperature rise of
the transformer 6 at the time of large input, and to prevent the linearity decrease caused by the
heat generation of the transformer 6. In addition, safety can be enhanced by using a heatresistant material such as a thermosetting resin as the vibration-proof material. Further, it is
possible to use the diaphragm metal foil alone to make it come out. It may be printed on a
flexible insulating film base metal foil in a spiral shape instead of being curled. As described
above, the matching transformer is embedded with a vibration absorbing material in the back
cover that constitutes the bank cavity for confining and absorbing the sound pressure generated
on the back side of the diaphragm. Accordingly, it is possible to prevent the deterioration of the
sound quality due to the deterioration of the sound quality due to the vibration of the matching
transformer and the generation of the intermodulation distortion due to the vibration of the pack
cover, etc. Because it can be done, it is possible to achieve cost reduction which is not as easy as
that performed separately and cost reduction can be achieved.
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