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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
dome-shaped diaphragm used for a speaker.
2. Description of the Related Art A conventional dome-shaped diaphragm will be described with
reference to FIGS. FIG. 4 shows the most typical shape, in which there is a vertical portion 2
around which the voice coil bobbin 4 is inserted and fixed around the dome portion 1 of the
diaphragm, and a flat portion 3 called an edge portion is formed on the outer periphery. The
voice coil bobbin 4 in which the coil 5 is wound is inserted and fixed to the inside of the rising
portion 2.
FIG. 3 shows an example in which the upper end of the voice coil bobbin 4 is bent and fixed
inward as a structure in which the rising portion is removed in order to improve the high
frequency characteristic.
Although the configuration shown in FIG. 3 is effective for improving the high frequency
characteristics due to the increase in stiffness at the rising portion, it is difficult to fix the voice
coil bobbin 4, and in particular, it is perpendicular to the flat portion 3 around the diaphragm.
There is a problem that it is difficult to maintain and fix.
FIG. 5 shows an example of a dome-shaped speaker incorporating these vibration system
In FIG. 5, reference numeral 6 denotes a plate having a center pole 7. A ring-shaped magnet 8 is
disposed on the plate 6, and a ring-shaped upper plate 9 is disposed on the magnet 8 to form a
magnetic circuit 10. The flat portion 3 of the dome-shaped diaphragm shown in FIG. 4 is fixed to
the step portion 11 provided on the inner peripheral portion of the upper plate 9 of FIG. The
speaker mounting plate 14 is connected to the top surface of the upper plate 9 to form a domeshaped speaker.
However, in the above configuration, since the upper end of the voice coil bobbin 4 is bent
inward and fixed, it is difficult to obtain the perpendicular angle of the diaphragm and the voice
coil, and the coil 5 is the upper plate 9. Or, in contact with the pole piece 7, there was a problem
of so-called gap failure.
An object of the present invention is to solve the above-mentioned conventional problems and to
provide a dome-shaped diaphragm excellent in high frequency characteristics.
In order to solve the above problems, the dome-shaped diaphragm of the present invention
comprises a cylindrical thin-walled projection for voice coil insertion and fixing in the direction
opposite to the dome protruding side of the dome rising portion. It is set as the structure formed
by integral molding with the whole diaphragm.
According to this configuration, even in the dome-shaped diaphragm without the rising portion,
the voice coil can be correctly fixed vertically, and the high frequency characteristics can be
stably improved.
present invention will now be described with reference to FIGS.
FIG. 1 is a block diagram showing a dome-shaped diaphragm according to the present invention,
which has a dome portion 15 at the center, and a flat portion 16 acting as an edge extending in
the horizontal direction at its peripheral portion; A cylindrical projecting portion 17 for voice coil
insertion and fixing is provided in a direction opposite to the projecting side of the dome portion
15 at the peripheral edge portion 15 (downward in FIG. 1)
By inserting and fixing a voice coil bobbin 18 in which the coil 19 is wound around the portion of
the cylindrical projection 17, assembly of a speaker becomes possible with the same voice coil
structure as that of the conventional example of FIG. Perpendicular to the flat 16 around the
Further, forming the cylindrical projection 17 as a separate component from the dome-shaped
diaphragm has problems in the accuracy of the circle and the strength of the rising portion, and
it is necessary to integrally mold it with the same material.
The positional relationship between the cylindrical protrusion 17 and the voice coil bobbin 18
can be configured either inside or outside, but as shown in FIG. 1, the voice coil bobbin 18 is
preferably disposed outside the cylindrical protrusion 17 as shown in FIG. The insertion device
can be fixed by placing the upper end of 18 against flat portion 16, and it is easy to pull out voice
coil lead 20 to the external terminal portion.
FIG. 2 shows an embodiment in which the voice coil bobbin 18 is disposed and coupled to the
inside of the cylindrical projection 17
As described above, the dome-shaped diaphragm according to the present invention has a
structure without a rising portion around the dome portion which can improve the high
frequency characteristic, and the voice coil can be accurately and easily fixed to the diaphragm. It
is a thing with a high practical price.