JPS57148992

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DESCRIPTION JPS57148992
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing the main part of a
conventional ribbon type speaker, FIGS. 2 to 4 show an embodiment of the present invention,
and FIG. 2 is a main part of the ribbon type speaker 3 is a perspective view of a vibration system
unit constituting a part of FIG. 2, and FIG. 4 is a perspective view showing a vibration system unit
applied to another speaker. 12: Vibration system unit, 12a, 22a1 ° 22a2: Ribbon-shaped
diaphragm, 12b, 22b: Frame, '12C2, 22C1, 22C2: Power supply.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ribbon type
speaker having a ribbon diaphragm made of a conductive metal foil alone. In such a speaker, the
diaphragm is disposed in the magnetic gap of the magnetic circuit, and the direct current
resistance is oscillated by flowing a signal current to, for example, the diaphragm itself having a
low resistance of 0.024 ohms and a very low 7. The plate is vibrated to emit sound. For this
reason, there is a problem that the impedance due to the self-inductance of the diaphragm at a
high frequency is increased, thereby decreasing the output sound pressure level. Therefore,
conventionally, as shown in FIG. 1, the feed body 2 to the diaphragm 1 is disposed parallel to the
diaphragm h in parallel to the diaphragm 1 and the L1 diaphragm 1 and the feed body 2 are
mutually reversed as shown by arrows. It was configured to flow the current of the direction to
solve this opening. In addition, 3 and 4 constitute a magnetic circuit together with another set of
permanent magnets and swellings (not shown). However, in this conventional speaker, since the
diaphragm 1 and the feeder 2 need not be separate from each other in the AIC magnetic circuit
13), the feeder 2 is formed into a predetermined shape and then fixed to the magnetic circuit. It
is necessary to provide a means for electrically connecting the diaphragm 1 and the feeder 2
with respect to the contact resistance at the connection point between the diaphragm 1 and the
feeder 2, the DC resistance of the diaphragm 1 and the presence or absence of disconnection.
And can not be performed unless it is incorporated in the magnetic circuit, which has
disadvantages such as poor workability. The present invention was made to the point mentioned
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above, and the place where the purpose is does not require special means for fixing the feeder,
and moreover the electrical inspection for the diaphragm and the feeder It is an object of the
present invention to provide a ribbon type speaker which eliminates the above-mentioned
conventional drawbacks by making it possible to perform the above-mentioned prior to the
incorporation into the magnetosphere path. An embodiment of the present invention will be
described below with reference to FIGS. 2 to 4. １．２１．、）！ 2 shows the main part of the
ribbon type speaker according to the present invention, and in FIG. 1, 10 is a permanent magnet,
11 is a pair of turns forming a magnetic circuit with the permanent magnet 10, and pJG is
formed between the yokes 11 during the magnetism. It is done. A vibration system unit 12 is
installed in the mounting groove 11 'of the vibration 11 and incorporated in a magnetic circuit.
The vibration system unit 12 is a ribbon-like diaphragm 121 made of a single conductive metal
foil such as a full dinium foil or a beryllium foil having a thickness of about 10 μm, and a frame
12kl supporting the diaphragm 12 turtle. A land-like feeder 120. h provided on the frame 12b.
And a window frame shaped feed 120.
And are assembled as shown in FIG. The frame 12b is, for example, a nonmagnetic metal plate 4
such as a full 1 n * plate whose surface is electrically insulated. １３３ｔ。 Da, 1... Are formed to
have a rectangular window hole 12b 'substantially in the center. In the land-like feeder 12C1 and
the window / frame-like feeder 12C1, the feeder 1201 is adjacent to one short side of the
window hole 12b 'and the feeder 12C7 is a feeder 120. And the window holes 12b 'are formed
on one surface of the frame 12b by the same etching method as in the case of producing a
printed circuit board. The replacement vibration diaphragm 1.21 is disposed so as to cross the
window hole 12b 'in the longitudinal direction, and one end of the replacement vibration
diaphragm 1.21 is connected to the power supply 120. And the other end of the power supply
120.1 facing the insulator 1201 with the window hole 12b '. Each part is electrically connected
by soldering or the like. Further, the diaphragm 121L is made narrower than the width of the
window hole 12b ', and a gap 1211 formed between the window hole 12b' and the diaphragm
12m) is made of a visco-elastic material as shown in FIG. Embedded by the damping material 12.
The damping material 12 · is for applying an appropriate damping force to the diaphragm 12 &
to improve 1 acoustic characteristic. In addition, the code ¦ symbol 41i112f is each connected to
the electric power feeding body 12m) and the electric power feeding body 12b20 part adjacent
to this. As described above, by forming the vibration system enit 12, the feed body 121) is
provided in parallel with the longitudinal direction of the diaphragm 12a, and the signal! When
the signal current is supplied from 112f, as shown by an arrow in FIG. The reverse current flows
in the part of. For this reason, 135 smears are generated by the diaphragm 121 and the portion
of the power supply 12 o parallel to the h. Of the magnetic field being mutually canceled, selfinduction which the diaphragm 12 & and the feed body 12i have, and decrease in the inductance
to maintain good high frequency characteristics L? ｌ−ｉ。 In the embodiment described above,
the ribbon-shaped diaphragm was one sheet, but the present invention is a ribbon-shaped
speaker having two narrator plates each arranged in two magnetic gaps whose magnetic field
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directions are opposite to each other. The vibration system unit 22 in this case is shown in FIG.
4+. In the unit shown in FIG. 4, two window holes 22b and 22b are formed in the frame 22b, and
feeders 2201 and 220.2 which attract along the window holes 22b and 22b, respectively.
And windows 22b and 22b. Power supply 2203 adjacent to both short sides of the window, and
one end of the diaphragm 22a and 221L disposed so as to cross the window holes 22b and 22b
respectively as '1136N' And 22C8 at one end and the other end to the feed 22C1, respectively,
and the feed 220 and 220. A signal @ 221 is connected to the other end of the. For this reason,
when the signal current is supplied from the signal # 22f, as shown by the arrows, the diaphragm
22 &, and the feeder 220. And diaphragm 22a! In addition, currents reverse to each other flow
through the feeder 220 ° to obtain a cancellation effect of the self-inductance. In the present
invention, as described above, a system for supporting a ribbon-shaped diaphragm made of a
single conductive metal foil alone and provided with a feeder in parallel with one diaphragm is
assembled to a vibration system x = knit magnetic circuit It is. For this reason, the current
directions .. 137 and J flowing in the diaphragm and the feed body are opposite to each other,
the self inductance of them is reduced, and the characteristics in the high frequency range are
improved. The unitization of the vibration system simplifies the assembly and handling of the
magnetic circuit and makes it easy to handle it, and the electric check of the diaphragm etc. can
be performed by the unit alone before the integration into the magnetic circuit. As a result, the
workability is improved, which leads to an increase in productivity and a cost reduction. In
addition, since the feeder can be formed by printing or the like, it is possible to further reduce
the cost, and a number of practically superior effects can be obtained.
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