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JPS62269500

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DESCRIPTION JPS62269500
[0001]
FIELD OF THE INVENTION The present invention relates to an electrodynamic flat loudspeaker
unit. The prior art flat speaker unit has no front room effect, has a simple vibration mode, easily
matches the theoretical value, and is close to an ideal sound source. Hereinafter, such a
conventional flat speaker unit is shown using FIG. 1 is a plane diaphragm, 2 is a compling ring
for driving the plane diaphragm 1 by a node, 32 иии-a voice coil, 4 is a frame, 6 is a top plate, 6 is a
magnet, 7 is a back plate, 8 is an edge, The numeral 9 is a damper, and 1o is a first node of the
flat diaphragm. The driving force of the voice coil is transmitted to the flat diaphragm via the
coupling cone 2. Problems to be solved by the invention However, the plane diaphragm has a
honeycomb structure or the like to increase the rigidity of the piston diaphragm so as to expand
the piston motion area. However, the first resonance mode as shown in FIG. In the flat speaker
unit of the system, resonance is generated as shown by a curve 16 in FIG. 4 in the second
resonance mode, and a peak is generated on the frequency characteristic. The present invention
has been made in view of the above problems, and it is desirable to reduce the resonance in the
second resonance mode without narrowing the piston motion region. Means for Solving the
Problems In order to solve the above problems, the flat speaker unit according to the present
invention comprises the flat diaphragm made of materials or structural members having different
speeds of sound with the nodes as boundaries. 3 и и и-By the present invention described above,
the second resonance frequency is different between the inside and the outside of the node, and
the resonance point is dispersed by appropriately selecting materials or structural members
having different speeds of sound. Therefore, the resonance in the second resonance mode can be
reduced. Embodiment FIG. 1 shows an embodiment of the flat speaker unit of the present
invention. 11, a first flat diaphragm member 12 is a second flat diaphragm member; The second
flat diaphragm members 11.12 are made of materials having different sound speeds, and
constitute one flat diaphragm. 1 o indicates the position of the first node of the plane diaphragm.
11-05-2019
1
FIG. 2 shows an embodiment in which structural members having different speeds of sound are
used. In the case of this embodiment, the density of the core portion of the honeycomb structure
is changed so that the speeds of sound are different with the nodes as boundaries. According to
the present embodiment, as shown by the curve 16 in FIG. 4, the resonance is reduced by
appropriately selecting materials or structural members having different second-order resonance
frequencies between the inside and the outside of the node and having different sound speeds. be
able to. As a result, the degree of completeness as a speaker unit is increased, and even when
used as a speaker system, there is no resonance and excellent sound quality performance can be
exhibited.
Effects of the Invention As is apparent from the above description, according to the present
invention, the second resonance frequency at the inside and the outside of the node can be
obtained by using materials or structural members having different sound speeds with the node
of the plane diaphragm as a boundary. In order to properly select materials or structural
members having different speeds of sound, the resonance can be reduced. As a result, the degree
of completeness as a speaker unit is increased, and even when used as a speaker system, there is
no resonance and excellent sound quality performance can be obtained.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a flat speaker unit according to an embodiment of the present
invention, FIG. 2 is a partially cutaway perspective view of the same plane diaphragm, and FIG. 3
is a cross-sectional view of a conventional flat speaker unit. FIG. 4 is a frequency characteristic
diagram comparing the flat speaker unit according to the embodiment of the present invention
with the conventional flat speaker unit.
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и и и и и и и и и и и и и и и и и и и и и , 12 ... second flat diaphragm member.
11-05-2019
2
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