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JPS5710184

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DESCRIPTION JPS5710184
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing the output sound pressure
frequency characteristics of a conventional cone-type speaker, and FIGS. 2, 3 and 4 are primary,
secondary and tertiary natural vibrations FIG. 5 is a schematic half-longitudinal cross-sectional
view of a diaphragm for a cone type speaker according to an embodiment of the present
invention. In the drawings, the same members are denoted by the same reference numerals, 12 is
a diaphragm, and 16 is a damping member.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm for a
cone type speaker, and more particularly to a diaphragm for a cone type speaker diaphragm
having smoothed frequency characteristics by smoothing its output sound pressure frequency
characteristic. . As shown in FIG. 1, the output sound pressure frequency characteristics of a
general-type and cone-type speaker generate a large peak on the frequency characteristics in a
high frequency region. The peak in this high frequency range is due to an axisymmetric vibration
that occurs due to a nodal circle in the circumferential direction of the diaphragm. As a result of
analyzing the vibration O behavior of the diaphragm O in this frequency region by the finite
element method, when one nodal circle is generated (hereinafter, n natural vibrations in which n
nodal circles are generated on the diaphragm are n-th natural It is called vibration. In the case of
the second-order natural vibration, the mode shown in FIG. 3 (in the case of the third-order
natural vibration) and the mode shown in FIG. It became clear that it was a poem to show. Here,
the frequency of the first-order natural vibration is hardly affected by the length K of the
diaphragm. In the figure, 12 is a diaphragm and 14 is an edge. From such a thing, when the
output sound pressure frequency characteristic is calculated, the part company which greatly
affects the output sound pressure frequency characteristic and is greatly harmful to the peak, the
first part natural vibration is the outer part of the nodal circle, 2 In the next one vibration and the
part surrounded by two S, in the third eigen-vibration, it is obvious that the innermost nodal
circle and the part that is surrounded by the adjacent 111iP1 on the outside are the kernels
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Became. Furthermore, it has also been revealed that the magnitude of the peak produced on the
output sound pressure frequency characteristic is more pronounced in the case of h% due to the
first-order natural vibration and the case due to the second- or higher-order natural vibration. On
the other hand, in the conventional diaphragm for the cone type speaker, there are few positive
measures for attenuating the peak that occurs on the output sound pressure frequency
characteristic like the kernel, and it is slightly However, there are cases where the corrugation is
designed in the circumferential direction of the diaphragm or the case where the mass of the
diaphragm itself is dispersed and the mode is deformed. These conventional measures are
satisfactory. No result is obtained-no and nine. Therefore, there has been a problem in the
development of a diaphragm for a cone type speaker which can be simplified in structure and
which can attenuate the peak occurring on the output sound pressure frequency characteristic.
The purpose of the present invention is to provide a diaphragm for a cone type speaker which
can be simplified in structure and can attenuate the peak generated on the output sound
pressure frequency characteristic. . In order to achieve the above object, the present invention
attaches a damping member made of a material having a large vibration loss property to the
nodal portion where the axisymmetric vibration of the diaphragm occurs which greatly
contributes to the peak on the output sound pressure frequency characteristic. As a matter of
strangeness, the characteristic peak is attenuated to obtain a smooth output sound pressure
frequency characteristic.
A preferred embodiment of the present invention will be described below based on the drawings.
As shown in FIG. 5K showing an embodiment of the present invention, the core (diaphragm for
loudspeaker tz K has a diameter of 70 to 90% of the length of the bus from the end face of the
axis CL of the diaphragm 12). A damping member 16 made of a material having a large vibration
loss property is mounted in an annular shape with a suitable width at nine positions separated by
a suitable length. The attachment position is set so as to relate to an in-cylinder portion in which
an axisymmetric vibration of the diaphragm is generated which contributes to the beak caused
by the second-order natural vibration on the output sound pressure frequency characteristic. The
damping member l @ is made of a visco-elastic body (e.g., a synthetic resin) which is light in
weight as well as having a large vibration loss property, and the visco-elastic damping member
16 of the vines is Is attached to the back surface of the diaphragm 12 by an appropriate surface
means such as adhesion or coating. Reference numeral 14 denotes an edge for supporting the
outer periphery of the diaphragm. By the way, considering FIG. 3, the amplitude of the portion of
the diaphragm 12 surrounded by the two nodal circles is large, and a large peak is generated on
the output sound pressure frequency characteristic. Axisymmetric vibration 18 that occurs
outside of the circle, and &! It can be understood that the axisymmetric vibration 20 generated in
the eight-folded part and the extended resonance (in the +1 phase vibrate in a broad sense), thus
acting to mutually cancel the peaks of both the vibrations 1s and 2 ии. Therefore, in the
diaphragm 12 for a cone type speaker according to the above-mentioned configuration, the
damping member 1G made of a light-weight visco-elastic body with large vibration loss is
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attached to the portion where both vibrations ill and 2G occur. The cancellation action of 0
cooperates to reduce the amplitude of these oscillations 18.2 @, and as a result, the peak on the
output sound pressure frequency characteristic is attenuated and smoothed, exhibiting a smooth
output sound pressure frequency characteristic And K become. In the above embodiment, when a
damping member made of a lightweight, vibration-lossy visco-elastic body is attached to the back
surface of the diaphragm, it is indicated by 9 that the damping-portion ray made of a visco-elastic
body is one end thereof. The above amplitude can be attenuated even if the other end is locked to
the speaker frame independent of the vibration of the diaphragm on the back surface of the
diaphragm and attached to a predetermined location of the diaphragm). The same effect as the
example can be obtained. In the case of hen, the visco-elastic body does not necessarily have to
be light weight. (In addition, the damping member is not limited to the viscoelastic body as long
as the vibration loss property is appropriate. As described above, the output sound pressure
frequency characteristic can be smoothed by a simple structure in which the damping member is
crimped to an appropriate portion of the d1 diaphragm according to the present invention.
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