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JPS5524829

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DESCRIPTION JPS5524829
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a conventional
speaker, FIG. 2 is a diagram showing a first-order natural vibration mode of axisymmetric
vibration, and FIG. 3 ayb is a diagram showing one embodiment of the present invention. FIG. 4 is
a plan view showing the configuration of another embodiment of the present invention. In the
figure, 1 is a diaphragm, 2 is an edge, and 4 is a CFRP sheet. The same reference numerals in the
drawings indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The purpose of this invention is to increase the
natural frequency of the axisymmetric vibration of the speaker vibration system to measure the
expansion of the piston vibration range and to obtain a flatter output sound pressure frequency
characteristic. It relates to a speaker. FIG. 1 is a schematic structural view of a conventional
speaker, showing a half from the center in cross section. As shown in this figure, the diaphragm 1
and the edge 2 are joined via the adhesive 3 to form a cone 5. The Young's modulus and weight
increase occur at the joint by welding the adhesive 3 to the II · ll K-2 state, and the natural
frequency decreases in the axisymmetric vibration of the vibration system. . The decrease in the
natural frequency causes the outer peripheral portion of the diaphragm 1 to largely shake as
shown in FIG. Particularly noticeable in the mode in which one nodal circle occurs on a cone
(hereinafter referred to as one mode), and in the analysis by the finite element method for a
speaker with a diameter of 10 tm, providing a junction compared to the case of only a cone
Causes the primary natural frequency to decrease by about 12%. As described above, in the
speaker having the conventional structure, the Young's modulus of the outer peripheral portion
of the diaphragm 1 having the largest amplitude at the first-order natural frequency is low, so the
axisymmetric vibration of the speaker vibration system is relatively low. At the beginning,
distortion and peaks and valleys appear on the output sound pressure frequency characteristics,
causing deterioration of the speaker characteristics. For example, in the measurement of Young's
modulus by the vibration lead method, when the diaphragm 1 has Young's modulus E = 1.16 ×
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1
10′′dyne / cm ′ ′ and Young's modulus E = 1.32 × 10 · dyB6 / csa ′ ′ of edge 2, the
joint portion The Young's modulus is lower by 30% than the Young's modulus of the diaphragm
1 (210 "dyne / cs +"). This invention eliminates the drawbacks of the conventional loudspeaker
described above, increases the primary natural frequency in the axisymmetric vibration of the
loudspeaker vibration system, and forms a wider piston oscillation region as compared with the
loudspeaker of the conventional structure. An object of the present invention is to disperse the
vibration mode which is likely to generate peaks because of symmetry in the axisymmetric
vibration and to further flatten the output sound pressure frequency characteristic from K. This
invention will be described below. FIG. 3 is a schematic view showing an embodiment of the
present invention, in which a ring-shaped carbon fiber reinforced plastic (CFRP) sheet 4 is
bonded to both surfaces of a junction of a diaphragm 1 and an edge 2 In order to reduce the
increase in weight at this time, holes 5 (indicated by dotted lines) are provided in the diaphragm
1 and the edge 2 respectively.
According to this configuration, not only the increase in weight can be suppressed, but also the
entire surface can be adhered uniformly. FIG. 4 shows another embodiment of the present
invention, in which the axisymmetric vibration has a symmetrical vibration mode or (3) 7 years
tτ Ld et al. The purpose is to suppress the crest by arranging the 0 FRF sheets 4
axisymmetrically and dispersing the mode of the axisymmetric vibration. Thus, the structure
according to this invention for bonding the 0 FRF sheet 4 having Young's modulus E = 1.4 × 10
′ ′ dyne / + − which is much higher than that of the conventional cone paper etc. to the
junction of the diaphragm 1 and the edge 2 By using this, the decrease in Young's modulus at the
junction between the diaphragm 1 and the edge 2 that reduces the primary natural frequency is
suppressed, and the piston vibration range is expanded. Further, by arranging the 0 FRP sheet 4
non-axially symmetrical, the vibration mode is dispersed, and the output sound pressure
frequency characteristic can be flattened. In each of the above-described embodiments, although
the 0 FRP sheet 4 is adhered to both surfaces of the joint portion in the above description, the
same effect can be obtained even if only one of the members is adhered. In addition, not only an
adhesive but also heat bonding may be used as a bonding means. As described above, according
to the present invention, it is possible to bond the diaphragm and the edge without increasing the
weight, so that the primary natural frequency in the axisymmetric vibration is increased to
increase the piston vibration range. While the enlargement can be measured, it has the effect that
the output sound pressure frequency characteristics can be flattened.
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