JPH06125594

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DESCRIPTION JPH06125594
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment.
[0002]
2. Description of the Related Art In recent years, due to problems with housing and the like, there
has been a marked demand for reductions in the size, size, reproduction of deep bass, and
improvement in the appearance quality of speakers. Among them, a so-called discrete edge type
speaker, in which the outer diameter of the diaphragm is made larger than the clamp portion of
the edge, is being widely used as a design means that meets the above requirements.
[0003]
Based on the background, a conventional discrete edge type speaker will be described below. FIG.
3 shows a conventional loudspeaker of this type. Referring to FIG. 3, the frame 6 is coupled to
the upper plate 2 of the magnetic circuit 4 configured by sandwiching the magnet 1 by the upper
plate 2 and the lower plate 3, and the peripheral portion of the frame 6 is made of diaphragm 7
such as paper. The voice coil 10 is bonded to the center of the diaphragm 7 in order to drive the
diaphragm 7 by bonding the other end of the edge 8 whose one end is pasted to the back surface
from the central portion at a distance from the outer peripheral portion 7A. The voice coil 10 is
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inserted into the magnetic gap 5 by centering the middle portion of the damper 11 with the
damper 11, and the dust cap 12 is adhered to the upper surface of the connecting portion of the
diaphragm 7 with the voice coil 10.
[0004]
However, the above-mentioned conventional discrete edge type speaker is in a free state because
the outer peripheral portion 7A of the diaphragm 7 has no clamper of the diaphragm 7.
[0005]
Therefore, when the diaphragm 7 vibrates, unnecessary resonance may be generated in the outer
peripheral portion 7A to disturb the frequency characteristics, and in a severe case, it may
generate quality defects such as generation of abnormal sound called surface noise. In particular,
the phenomenon of <1> occurred frequently when the weight of the diaphragm 7 was reduced to
improve the sound pressure level.
[0006]
An object of the present invention is to solve such conventional problems, and to provide a
speaker extremely excellent in frequency characteristics and sound pressure characteristics.
[0007]
SUMMARY OF THE INVENTION In order to solve the above problems, a loudspeaker according to
the present invention has a frame coupled to a magnetic circuit having a magnetic gap, and a
voice coil coupled to a central portion to the peripheral portion of the frame. The other end of
the edge with one end joined to the back of the outer peripheral portion of the diaphragm
excluding the above-mentioned corrugation of the vibration plate in which the corrugations of
the cross-sectional waveform are formed radially is connected with the other end .
[0008]
[Function] With the above configuration, the shape of the outer peripheral portion of the
diaphragm is also corrugated with respect to the upper and lower amplitudes of the diaphragm,
and the rigidity for the upper and lower amplitudes becomes greater than that of the
conventional product. Resonance and surface noise can be prevented.
[0009]
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A loudspeaker according to an
embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing the structure of a loudspeaker according to the present
invention, and 21 is a magnet, which couples an upper plate 22 and a lower plate 23 up and
down to form a magnetic circuit 24 having a magnetic gap 25.
[0010]
A frame 26 is coupled to the upper surface of the magnetic circuit 24, and the other end of an
edge 28 coupled to one end of a diaphragm 27 to be described in detail below is coupled to a
peripheral portion of the frame 26.
A voice coil 30 whose central portion is supported by a damper 31 is coupled to a central portion
of the diaphragm 27. The voice coil 30 is fitted into the magnetic gap 25 and further penetrates
the magnetic gap 25 from the outside. In order to prevent foreign matter, a dust cap 32 is
attached to the upper surface of the central portion of the diaphragm 27.
[0011]
FIG. 2 is a half sectional front view of the diaphragm 27 shown in the above embodiment. A
corrugation 27A having a cross-sectional waveform is radially formed on the outer periphery of
the diaphragm 27, and the outer peripheral portion of the diaphragm 27 excluding this
corrugation 27A. One end of an edge 28 is coupled to the back surface, and the other end of the
edge 28 is coupled to the periphery of the frame 26.
[0012]
As described above, in the loudspeaker according to the present invention, since the shape of the
outer peripheral portion of the diaphragm is corrugated, the rigidity with respect to the vertical
amplitude of the diaphragm is increased, and unnecessary resonance and surface noise are
prevented. Can.
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Therefore, it is possible to easily improve the sound pressure level by improving the input
resistance of the speaker and reducing the weight of the diaphragm, and it is also possible to
prevent quality defects such as abnormal sound due to surface noises. It is possible to provide a
speaker with excellent characteristics, and its industrial value is extremely large.
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