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JPS5357941

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DESCRIPTION JPS5357941
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic front view of a loudspeaker
according to the present invention, and FIG. 2 is a sectional view taken along the line A-A of FIG.
DESCRIPTION OF SYMBOLS 1 иииии Diaphragm, 1b ииииии Dome shape diaphragm, 9 иииии Pole, 9a ииииии
Horn shape (taber shape) cavity 10 ииииииииииииииииииииииииииииииииииииии Horn-shaped (taper-shaped) vacancy.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a loudspeaker, in
particular to a loudspeaker having a dome-shaped diaphragm, the aim of which is to improve the
frequency response. In order to improve the frequency characteristics of a loudspeaker having a
dome-shaped imaging plate, it has been proposed in the past. For example, a filler such as a
cotton-like material or felt is put between the dome-shaped diaphragm and the pole-hi-face that
constitutes the magnetic circuit, thereby adding an appropriate damping metal to the domeshaped diaphragm to suppress frequency deviations. There are also Such a filler helps to improve
the frequency characteristics as described above, but there is not much improvement especially
in the low frequency band. In addition, since the adhesive is used when the filler is attached, the
thickness of the diaphragm becomes uneven due to the restriction of the adhesive and the like,
and the reproduction characteristics are deteriorated. On the other hand, the pole is made into a
cavity and the rear surface of the dome-shaped diaphragm is communicated with the outside. In
this case, the filler is placed between the pole upper surface and the diaphragm, and the filler is
also placed in the cavity of the pole, and thus the dome-shaped diaphragm and the plate upper
surface are formed by It is possible to reduce the compliance of the space and to prevent the
reflection of sound by the pole cavity. However, the dome-shaped diaphragm and the upper
surface of the pole have the filling described above, which has the above-mentioned drawbacks,
and the filling in the pole cavity moves due to the sound pressure, and distortion occurs in the
reproduced sound particularly when the amplitude is large. It may occur. (2nd row: 4 senoe 1 1.
?? ??? ???? ??? In particular, an equalizer is provided in a space formed by a domeshaped diaphragm and a ball upper surface, and a space is formed such that the diameter of the
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equalizer and the pole decreases toward the diaphragm side. It is an object of the present
invention to obtain a speaker which can reproduce well even in a low frequency band and can
obtain a reproduced sound without distortion even at a large amplitude. An embodiment of a
loudspeaker according to the present invention will be described below with reference to the
drawings. In the figure, the diaphragm 1 is composed of a cone-shaped diaphragm 1a and a
dome-shaped diaphragm 1b, and an outer peripheral end 1c of the cone-shaped diaphragm 1a is
fixed on a frame 2 by a packing 3. A voice coil bobbin 4 is provided at the boundary between the
cone-shaped diaphragm 1a and the dome-shaped diaphragm 1b. As well known, the voice coil
bobbin 4 is provided with a voice coil 5 on the circumferential surface and a damper 6. One end
of the damper 6 is fixed to the frame 2 by, for example, an adhesive.
The three magnetic circuits are composed of a plate 7, a magnet 8 and a center pole 9. The
center pole 9 and the plate 7 face each other via a predetermined gap, and the voice coil 5 is
positioned in the gap. The center pole 9 is formed therein with a cavity 9a whose diameter
decreases toward the dome-shaped diaphragm 1b. Therefore, the inner wall 9b of the pole 9 is
horn-like (tapered). Also, in the space formed by the dome-shaped diaphragm 1 b and the upper
surface of the pole 9, the equalizer 10 according to the present invention is provided. The
equalizer 10 is made of, for example, a hard felt, and the outer surface 10a of the equalizer 10 is
opposed to the bobbin 4 with a predetermined gap a, and the upper surface 10b has a radius
larger than the radius of the dome-shaped diaphragm 1b. The diaphragm 1b is opposed to the
upper surface 10b so that vlib gradually increases toward the top from the edge of the
diaphragm 1b, and the lower surface 10c is attached to the upper surface of the pole 9 with an
adhesive. Furthermore, inside the equalizer 10, there is formed a vacant space 11 whose
diameter gradually decreases toward the diaphragm 1b (ie, it is uniform). Therefore, the inner
wall 10d of the equalizer 10 is horn-shaped (tapered). The horn-shaped (taper-shaped) inner wall
10d is made to be continuous with the inner wall 9b of the pole 9 with almost no difference.
Therefore, the pole 9 and the inside of the equalizer 10 are connected in a horn shape by one
space portion. Further, in the cavity 9a of the pole 9, a sound opener 12 made of, for example,
ester wool or glass wool attached to the inner wall 9b of the pole 9 with an adhesive is provided.
It is preferable that the inner circumferential surface 12a of the sound opening member 12 be an
inclined surface which is continuous with the inner wall 9d of the equalizer 10 substantially or
largely. According to the speaker of the present invention, the equalizer 10 is provided in the
space formed by the dome-shaped diaphragm 1 b and the upper surface of the pole 9, so that the
compliance can be reduced and reproduction to a frequency band that is so low It becomes
possible. Furthermore, since the interior of the equalizer 10 is in communication with the hornshaped (tapered) cavity 9a of the pole 9, the mass in the pole 9 can be made extremely small, and
the above-mentioned ((5) Together with this, it is possible to minimize the resonance sharpness,
and good reproduction frequency characteristics can be obtained. In the embodiment of the
speaker according to the present invention, since the sound opening member 12 is provided on
the inner wall 9b of the pole 9, the reflection by the cavity 9a of the pole 9 is effectively avoided
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and the inner surface thereof is Since the horn shape of the equalizer 10 is substantially the
same, there is no possibility that the sound opening member 12 moves due to the sound
pressure.
Therefore, despite the presence of the sound opening member 12, it is still possible to reduce the
resonance sharpness. The gap a formed by the outer peripheral surface 9a of the equalizer 10
and the boss 4 is the smallest, and the gap formed by the upper surface of the equalizer 10 and
the diaphragm 1b is successively larger and gradually larger. Thus, in the loudspeaker according
to the above-described embodiment, the internal sound pressure generated by the dome-shaped
diaphragm 1b can be communicated with the horn-like space without difficulty. As a modification
of the speaker of the pond water device, the present invention is also applied to a speaker having
a dome diaphragm in which the peripheral edge of the diaphragm without a cone-shaped
diaphragm, that is, the rim of the dome is attached to the frame Is possible. Also, if a horn-like
cavity is formed inside the pole, a relatively open material may be filled into the inner cavity
metal body.
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