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JPS5633879

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DESCRIPTION JPS5633879
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional super
power, FIG. 2 is an equivalent circuit diagram of a resonant system on the back of the diaphragm
of the same speaker, and FIG. Fig. 4 is a cross-sectional view of another conventional example,
the fifth cause is a cross-sectional view of a speaker according to an embodiment of the present
invention, Fig. 6 is a sound pressure frequency characteristic diagram of the same speaker, and
Fig. 7 is the other FIG. 8 is a cross-sectional view of a coil emboss portion of the same speaker,
and FIG. 9 is a cross-sectional view of another embodiment of the present invention. 1 и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и ----circular flat diaphragm, 7 ...... edge member, Fu ..... coil bobbin, 9 ...... voice coil - le, 10 ......
Danpani, 11 & иииииииииииииииииииииии Hole.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
using a circular flat diaphragm, and it is an object of the present invention to eliminate cavity
resonance inside a coil bobbin and to flatten sound pressure frequency characteristics. FIG. 1
shows a conventional loudspeaker of this kind. In FIG. 1, 1 is a yoke in which the center pole 2 is
integrally formed to---,, /, 02-, 3 is an annular magnet fixed to the upper surface of the yoke 1, 4
is fixed to the upper surface of the magnet 3 An annular magnetic gap is formed between the
inner peripheral surface of the yoke 4 and the outer peripheral surface of the center pole 2.
Reference numeral 5 denotes a frame fixed to the yoke 4 and 6 denotes a circular flat diaphragm.
The circular flat diaphragm 6 is supported by the frame 5 via an edge member 7. As the circular
flat diaphragm 6, for example, a diaphragm in which a surface material is adhered to both
surfaces of a core material in which a honeycomb material is expanded is used. A cylindrical coil
bobbin 8 is adhered to the lower surface of the diaphragm 6, and a voice coil 9 is wound around
the coil bobbin 8. The voice coil 9 is disposed in the magnetic gap portion. 10 is a damper for
supporting the coil hobin 8. The bonding position of the coil bobbin 8 to the diaphragm 6 is
inside the cylinder of the second resonance mode v1 ░ at the time of bending resonance of the
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planographic diaphragm 6, and when the inside of the cylinder of the diaphragm 6 is driven by
the coil bobbin 8, the resonance mode V ,. Is eliminated, and the sound pressure peripheral threewave number characteristic becomes flat at the frequency 1 at which the second resonance mode
occurs. The radius r of the nodal circle of the first resonance mode 1 ░ is r = oe 7 BR, where R is
the radius of the circular plate diaphragm 6 of a homogeneous material. Therefore, the radius r
of the nodal circle in the case of the diaphragm of R = 966 wn is r 2 647 k. As described above,
when the node circle is driven, the reproduction band of the sound pressure frequency f can be
expanded, while the diameter of the coil bobbin 8 becomes large. It is necessary to increase the
distance between the diaphragm 6 and the setter ball 2 (usually at least twice the maximum
amplitude) to prevent the diaphragm 6 from hitting the damper 10 or hitting the magnetic circuit
when the amplitude is large. Therefore, the length of the coil bobbin 8 becomes longer. Thus, in
the speaker of this type, the diameter and length of the coil bobbin 8 become large, so the space
S surrounded by the vibration tb plate 6, the coil bobbin 8 and the center ball 2 becomes large,
and the large volume of air in this space S The resonance system as shown in FIG. 2 is
constituted by the component C and the air mass m1 in the magnetic gap and the air mass m24
in the hole of the center ball 2, and resonance occurs at a low frequency, as shown in FIG.
However, there is a drawback that a peak-valley A is generated in the sound pressure frequency
characteristic and the flat band width is narrowed to adversely affect the sound quality.
FIG. 4 is another prior art example. The present invention eliminates the above-mentioned
conventional drawbacks, and one embodiment of the present invention will be described below
with reference to FIG. In FIG. 6, reference numeral 11 denotes a cylindrical equalizer fixed to the
upper surface of the center ball 2, and the diameter of this equalizer is formed to be the same as
or somewhat smaller than the diameter of the center pole 2. When the equalizer 11 is provided
as described above, the space in the coil bobbin 8 becomes smaller and the capacitive component
C becomes smaller, so that the resonance frequency of the resonance system in FIG. 2 becomes
higher, as shown in FIG. , The reproduction band is expanded. FIG. 7 shows a second embodiment
of the present invention, in which a cylindrical equalizer 11 is provided. In the present
embodiment, as shown in FIG. 8, a plurality of holes 12 are formed in the fifth coil bobbin 78 as
shown in FIG. 8, and the air in the space inside the coil bobbin moves through the holes 12. Since
the capacitance component is changed to a mass component, resonance is eliminated. FIG. 9
shows a third embodiment of the present invention. In this embodiment, a cylindrical equalizer
11 is provided on the upper surface of the yoke 4 of the conventional example which is small in
FIG. As described above, in the present invention, the equalizer protruding in the coil bobbin is
provided on the upper surface of the magnetic circuit, the volume of the space in the coil bobbin
is reduced, resonance at low frequency can be removed, and the reproduction band is expanded.
It is.
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