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Specification t Speaker (1) A circular diaphragm consisting of aluminum foil skins attached to
both upper and lower surfaces of a core made of light metal or synthetic resin, a peripheral
portion fixed at one end and a peripheral portion at the other end In a loudspeaker comprising a
truss 7 acorn which is fixed to a bobbin on which the coil is mounted and which transmits coil
vibrations to the diaphragm, the diaphragm is symmetrical about the central axis of the
diaphragm and is not uniform. Loudspeaker characterized in that it has a thickness with a
2, the scope of claims
Detailed Description of the Invention The present invention relates to the improvement of a
speaker structure. It is advantageous for the loudspeaker to faithfully reproduce the input signal
that the sound radiation surface is planar, and various types of loudspeakers have emerged.
However, these conventional speaker structures have disadvantages of each digging. Hereinafter,
this will be described with reference to FIGS. 1 to 3. A conventional diaphragm 1 is shown in FIG.
1α, and skins 3 made of aluminum foil are attached to both the upper and lower sides of a
honeycomb structure core 2 as shown in FIG. In the diaphragm 4 of FIG. 1C, the core 5 is formed
of a foam material, and is provided with a skin 6t-such as an aluminum foil or a polymer film.
FIG. 2 is a cross-sectional view of a conventional speaker using these dialerams 1. This speaker
connects both the disk-shaped diaphragm 1 and the frame 11 by an edge 7, and the air gap of
the magnetic circuit 12 is obtained. Attach the bobbin 10 and the transformer 7 Accor 7B'fc
around the coil as shown inside, attach the periphery of this transformer 7 acorn 80-m to the
back surface of the diaphragm 1 and attach the periphery of the other end to the bobbin 10 The
bobbin 10 and the frame 11t are connected to each other at 9 to be suspended at a
predetermined position within the gap on the end face of the coil. In the conventional speaker
having such a structure, the thickness of the diaphragm is uniform, so that the rigidity against
bending is small, and the diaphragm is likely to generate the undesirable non-axisymmetric
vibration as shown in FIG. Since it can not be lightened, it leads to a decrease in the electroacoustic conversion efficiency. In addition, an extra large magnet is required to increase the
sound conversion capability. Furthermore, although the transfer cone drives the first mode of the
axisymmetric vibration with respect to the circular diaphragm, the natural frequency at which
the second mode appears is lowered to limit the range of use as a speaker. And since the
reproduction ¦ regeneration sound pressure peak becomes high in the resonance state of a 2nd
mode, there existed a fault to which the performance of a speaker becomes unsatisfactory. The
present invention aims to eliminate the disadvantages of these conventional loudspeakers, and
provides all the loudspeakers with the same performance as the conventional loudspeakers. Of
non-axisymmetric vibration by reducing the overall weight without losing the rigidity against
bending by forming it from the foam material and providing a symmetrical but uneven thickness
distribution at the axial center. In addition to the prevention, the electro-acoustic transducivity is
improved. In addition, by providing a corrugation sun on a transfer cone for driving a sound
wave generation surface to generate a mast-transmission, it is characterized in that a peak sound
pressure level for cutting off a high region and stopping in the second mode is reduced. .
The present invention will be described as follows according to FIGS. 4 to 6. FIG. 4 shows a crosssectional view of the diaphragm 16 used in the present invention, and the skins 15 and 16 of
aluminum (may be other light metals) are adhered to the upper and lower surfaces of the core 14
made of foamed aluminum or synthetic resin foam. Is it 0 and circular diaphragm 1? : Has a
thickness which is symmetrical and not uniform with respect to its central axis, and forms a ringshaped maximum thickness 17 up to a maximum thickness. In FIG. 5, a cross-sectional view of a
6-speaker according to the present invention using such a diaphragm 16 is shown in FIG. 5, 11 is
a frame, 12 is a magnetic circuit, 18 is an edge, 19 is a transfer cone, 21 is a transfer cone. The
spider is a bobbin for suspending the 22i coil in the air gap of the magnetic circuit 12. In the
middle of the both end peripheral part of the transformer 7 acorn 19 is provided a corrugator
20. Furthermore, in this embodiment, the upper end peripheral portion of the transfer cone 19 is
attached to the thickest portion 17 of the diaphragm 15. Therefore, it was confirmed that this
attachment is easy to work and that the vibration transmission performance is improved.
Diaphragm 25 ′ t − and corrugation ■ 725 of another embodiment having maximum
thickness of two points i)? The one attached to the sensor 7 acorn 24 is shown in FIG. These
thickest portions are axisymmetrically distributed so as to raise the resonance frequency
corresponding to the second mode of axisymmetric vibration. In the speaker according to the
present invention, the diaphragm has the same function as the circular rib at the thickest portion
thereof, and the curvature corresponding to non-axisymmetric improves rigidity and does not
cause non-axisymmetric vibration. It will be stealing so much 4. If the bending rigidity is satisfied,
the diaphragm weight will be light and the electro-acoustic conversion efficiency will be high. If
this conversion efficiency is equal, the necessary magnet will be small. be able to. In addition, the
characteristic resonance frequency of the axisymmetric second mode can be increased by
adjusting the distribution of the thickness of the dian ram, and the first mode can be prevented
from being generated due to the node drive. The frequency rises and the application is
broadened. If a corrugation and a torus are provided to the sarani and transfer cone, the high
frequency area and the interruption are performed by the stiffness action, so that the peak sound
pressure level generated by the axisymmetric second mode can be reduced to improve the
acoustic performance.
4. Brief description of the drawings Fig. 1α, Fig. 1C are sectional views of a conventional
diaphragm, Fig. 1b is an explanatory view of a two-cam structure of the core as well, Fig. 2 is a
sectional view of a conventional loudspeaker, Fig. 3 is an explanatory view of non-axisymmetric
vibration, FIG. 4 and FIG. 6 are sectional views of a diaphragm used in the embodiment of the
present invention, and EndPage: 2 FIG. 5 is a sectional view of one embodiment of the present
invention . Diaphragm 2, 5.14: Core 5, 6.15.16: Skin 7.18: Edge 8, 19.24: Transfer
cone 10, 22 ··· Bobbin 11 ··· Frame 12 ··· Magnetic circuit 20, 25 ························ Page: 3