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JPS5351726

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5351726
Description 1, title of the invention
Ribbon type speaker
3. Detailed Description of the Invention The present invention relates to a high efficiency, high
impedance, high input resistance ribbon speaker. The ribbon type speaker in the prior art is
configured as shown in FIG. 1 and FIG. That is, the diaphragm 4 made of one metal foil is
disposed in the magnetic gap 3 between the two magnets 1.2, and the current i is made to flow in
the direction shown in FIG. The sound was generated by vibrating in the direction of the arrow in
the figure. However, in this configuration, the volume occupied by the diaphragm 4 in high
density magnetic flux is small, the utilization efficiency of the magnetic flux is poor, and a current
is flowed to the diaphragm 4 made of one metal foil. Since the impedance is very small and
matching is required for connecting the amplifiers, and all the power is concentrated on the thin
diaphragm 4 having a small area, there is also a problem in the input resistance. Further, the
occurrence of distortion due to surface resonance of the diaphragm 4 made of metal foil has also
become a major problem. EndPage: The present invention seeks to eliminate the abovementioned conventional defects. Hereinafter, the present invention will be described with
reference to FIGS. 3 to 11 of the drawings. First, in FIG. 3, 5 and 6 are prismatic magnets, and a
magnetic gap 7 is formed between the two magnets 5 and 6. In the magnet 5, the N pole is
magnetized on the magnetic gap 7 side and the S pole is magnetized on the outer surface, the
magnet e is magnetized on the magnetic gear tube γ side XS pole and the N pole is magnetized
on the outer surface. In the magnetic gap 7 formed between the magnets 5 and 6, a diaphragm 8
formed in a wave shape, in other words, an accordion curtain shape, of a strip-like metal foil such
as an aluminum foil or a copper foil is disposed. The operating principle of the ribbon type
speaker according to this configuration is as shown in FIGS. 4 to 6. In FIG. 4, the direction of the
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magnetic flux receives a force in the direction perpendicular to the paper surface, and the
diaphragm 8 is At the same time as the air above is pushed upward, the air in the corrugated
portion 9 is also pushed upward because it is partially expanded or narrowed. Conversely, when
the direction of the current flowing to the diaphragm 8 is from right to left, the force acting on
the diaphragm 8 is opposite 9, and the air below the diaphragm 8 is pushed downward and at
the same time the wave-shaped portion 9 The air inside is also pushed downward. As described
above, in the ribbon type speaker according to the present invention, air can be vibrated in the
vertical direction of the diaphragm 8 as in a general speaker, and the air in the wave-shaped
portion e can be pushed in the vertical direction to generate sound. Apart from the basic
construction as described below, the embodiment as shown in FIGS. 7 to 9 can be considered.
That is, as shown in FIG. 7, an attempt is made to provide a ribbon type speaker in which the
wave-shaped portion 9 of the diaphragm 8 is ring-shaped and the direction of the waveform is a
radiation direction to make it horizontal nondirectional. Specifically, as shown in FIGS. 8 and 9, a
plate 12 having an H-shaped cross section having a ridge 10.11 at its upper and lower ends, and
a ring on the other side of the square 10 of the plate 12 And a diaphragm 8 having the abovementioned wave-shaped portion 9 in a ring shape is disposed in a ring-shaped magnetic gap 15
formed between the magnet 13.14 and a ribbon-shaped speaker. It is This (C. The operating
principle is the same as that described above, but as its effect, it can be a non-directional range in
the horizontal direction. As another example, one shown in FIGS. 10 to 11 can be considered.
That is, it is intended to provide a planar ribbon speaker with the diaphragm 80 wave-shaped
portion 9 in the vertical direction. Specifically, a columnar magnet 17 is erected at the center of
the bottomed cylindrical yoke 16, and a disk-shaped center plate 18 is provided on the magnet
17. The operating principle of the shaped loudspeaker may be the same as that described above,
or the effect may be a loudspeaker that radiates the sound ml in a planar manner. Further, it is
also possible to use a diaphragm in which a metal film is used as the diaphragm 8 or a metal film
is vapor-deposited or printed on a film of polyethylene terephthalate or the like. Compared with
the ribbon type speaker (rJ according to the present invention configured as described above, the
diaphragm is longer than the conventional ribbon type speaker, so the impedance is high, the
vibration area is large, and the heat dissipation effect is good9, durability is also Get higher.
Moreover, since the diaphragm has a wave shape, surface resonance of the diaphragm is less
likely to occur, and stabilization of the characteristics can also be measured. For example, if the
diaphragm area is n times that of the conventional diaphragm, the impedance is also n times, and
the flowing EndPage: 2a is the diaphragm radius, m! f'i mass F is force, π, Zo and C are
constants. If the ribbon type speaker of the present invention is applied to this formula, the
efficiency can be improved as compared with the conventional ribbon type speaker. As described
above, the ribbon speaker of the present invention has various advantages and is a dog of
industrial value.
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4. A top view showing one embodiment of the simple explanatory power of drawings, FIGS. 4 to 6
are explanatory views for explaining the operation principle of the diaphragm in the same
speaker, and FIG. 9 is a sectional view of FIG. FIG. 11 is a perspective view of a diaphragm
according to still another embodiment, and FIG. 11 is a perspective view of a ribbon speaker
using the same diaphragm. 5、6、13、14、17、.1.、、マグネット、i2、、、、
+、プレート、1−6、、、、、、ヨーク、18.。 ・・・・センタープレート。 Name of
agent Attorney Nakao Toshio Nakano has 1 person Figure 1 Figure 8 f2 // EndPage: 3
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