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JPS51163935

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Notice
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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS51163935
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 show the structure of a conventional
speaker diaphragm, and FIGS. 3 and 4 show the structure of the speaker diaphragm of the
present invention. 1 is cone paper, B is an outer peripheral portion, and 6 is a protrusion. Second
trouble one 89-real opening 51-163935 (2)-90-
[Detailed description of the invention] The present invention relates to a structure in which only
the outer peripheral portion of cone paper is reinforced, and the vibration mode is ideally made
over a wide frequency range, and if the distortion is small and the frequency characteristic in the
middle region is flat. Provided is a diaphragm for a speaker that can be tightened. In general, a
free edge type speaker diaphragm has a structure in which an edge 2 is attached to the outer
peripheral end of a cone sheet 1 as shown in the figure. The cone paper 1 is required to be light
weight and rigidity sufficiently large in addition to various acoustic characteristics, and these two
requirements are in a mutually contradictory relationship, and in general, if the cone paper 1 is
made light, the property is significantly reduced. Do. For this reason, the normal cone plate 1
paper 1 over the entire frequency range, in particular the large amplitude of the piston vibration
region, deflection phenomenon or unsteady vibration occurs to the vibration of high energy, and
from the piston vibration region to the divided vibration region In the transition frequency band,
reverse resonance to produce a nodal circle, and disturbance of the vibration form in the divided
vibration region or remarkable occurrence, it was impossible to obtain flat frequency
characteristics with less distortion over a wide frequency range . Therefore, conventionally, as
shown in FIG. 1, a large number of projections or projections 3 are provided on the entire surface
of the corn paper 1 to increase the rigidity of the whole corn paper 1 or the outer circumference
of the corn paper 1 For example, as shown in FIG. 2, the outer peripheral end of the cone paper 1
is bent backward to provide a reinforcing rib 4 and, if necessary, an adhesive is applied to the
reinforcing rib 4 as shown in FIG. There was a structure which applied five. However, the former
can take various resonance points in the divided vibration region, the vibration is suppressed and
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substantially divided vibration occurs, and flat frequency characteristics can not be obtained over
a wide range. Further, the latter is likely to cause uneven unevenness 3-3 at the time of paper
making and is difficult to form and process uniform reinforcing ribs 4, and is also suitable for
mass production because uniform application of adhesive 5 is difficult. Because reinforcement of
the outer peripheral part of 1 is not enough, it causes sharp dip due to reverse resonance of the
outer peripheral part and the inner peripheral part where the outer peripheral part is the node of
divided vibration in frequency characteristics and causes insufficient rigidity of the outer
peripheral part. The above-mentioned drawbacks have not been spared. The present invention
eliminates the above-mentioned drawbacks by devising a reinforcing structure of the outer
peripheral portion of corn paper and will be described with reference to FIG. 3 and the following
drawings. As shown in the figure, a plurality of substantially spherical shell-like projections 6 are
formed irregularly and integrally only on the outer peripheral portion B of the cone paper 1
divided symmetrically with respect to the cone axis. The protrusions 6 are not limited to
spherical shells only, and may take various shapes according to the usage of the cone paper 1.
Also, the projections 6 are arranged in such a manner that the flat portions 7 present between
the adjacent projections 6.6 do not form a regular annular band and a linear band corresponding
to the generatrices of the conical cone paper 1, and In the case where they are arranged in a
completely irregular manner), some are arranged between the adjacent projections 6, 6, and
some are arranged so as to overlap each other. According to the above-described structure, the
substantially spherical shell-like protrusion 6 is extremely high in rigidity (curved rigidity) even
in the direction of the structure, and accordingly, a plurality of the protrusions 6 are irregularly
integrated. The rigidity of the outer peripheral portion B of the formed cone paper 1 is
sufficiently large. Therefore, over the entire frequency range, particularly during high vibration
of the piston vibration region, no deflection phenomenon or vibration occurs even with high
energy vibration. In addition, since the outer peripheral portion B is sufficiently reinforced and
the projections 6 are irregularly formed, the standing wave anchor which produces a concentric
nodal circle with the outer peripheral portion B as a node <<, Peeling or dipping due to this
standing wave is suppressed. Furthermore, in the outer peripheral portion B, vibration is
significantly suppressed in the divided vibration region, and substantially no divided vibration
occurs. Therefore, in the divided vibration area, only the inner peripheral portion A of the cone
paper 1 or various vibration modes are exhibited to perform divided vibration, in other words,
the effective vibration area of the cone paper 1 is reduced, and the high sound vibration with a
small effective vibration diameter. Acting as a plate, it has a useful vibration over a wide
frequency range of 5), and significantly reduces the reproduction frequency band. Further, since
the cone paper 1 inner peripheral portion A operates as a high frequency sound diaphragm in
the divided vibration region, the directivity characteristic is improved. Furthermore, since the
projections 6 are integrally formed, they are suitable for mass production, and the increase in
mass of the cone paper 1 can be absorbed by the remarkable increase in rigidity. As described
above, according to the present invention, a plurality of substantially spherical shell-like
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protrusions 6 are formed irregularly and integrally only on the outer peripheral portion B of the
cone paper 1 divided symmetrically with respect to the cone axis. The above-mentioned defects
caused by the insufficient rigidity of B, in particular the deflection phenomenon and the unsteady
vibration are eliminated, and in the divided vibration region, the inner peripheral portion A
effectively vibrates as a diaphragm for high sound i, and a wide frequency It is possible to obtain
a flat frequency characteristic with no distortion and dips and with less distortion and good
reproduced sound over the range. Warehouse
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