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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view of a speaker having a
bifurcated sealed back cavity, FIG. 2 is a sound pressure frequency characteristic diagram of the
same speaker, and FIG. 3 is a main part of a conventional speaker 4 is a cross-sectional view of
an essential part showing one embodiment of the speaker of the present invention, FIG. 5 is a top
view of the essential part, and FIG. 6 is a sound pressure frequency characteristic diagram of the
same speaker. 5 иииии Magnetic circuit, 6 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и diaphragm и 9 и и и и и
и и voice coil, 11 ииииииии Magnetic gap, 14 ииииии Vents J
DETAILED DESCRIPTION OF THE INVENTION The invention relates to the improvement of a
loudspeaker having a closed back cavity, in which several vents are provided in the lower gasket
in order to stabilize the sound pressure frequency characteristic. In general, in a speaker
apparatus including a low sound speaker, a mid sound speaker, and a high sound speaker box in
one speaker box, the air pressure in the back of the diaphragm of the low sound speaker as the
mid sound speaker, 2, 7 ?; , 4'2 in effect, the frame may be sealed or it may be configured to
have a sealed pack cavity with a cover or the like. Such a speaker may be constructed as shown
in FIG. 1, that is, a magnetic circuit comprising a plate 2 having a center pole 1, a ring-shaped
magnet 3 and a ring-shaped upper grating 4i. A frame 6 without a window is joined to 5 and the
lower gasket 7 is fixed to the peripheral edge of the frame 6 and the peripheral edge of the
vibration 1 counter 8 is affixed on the lower cask soto T. The voice coil 9 is coupled, and the
middle portion of the voice coil 9 is held by a damper 1Q and fitted into the magnetic cap 11 of
the magnetic circuit 6 without eccentricity, and the dust cap 12 is attached to the central upper
surface of the diaphragm 8 It is configured. In such a closed back cavity (in the case of a speaker
with r, as shown in FIG. 2, sound pressure cylinder 2-wave number characteristics, the low
frequency band (squaker (: '-,, band)) of the medium sound speaker There was a b defect that the
area portion was raised and the sound pressure frequency characteristic crosses with the bass
spy force can not be in the best state. For this reason, conventionally, as shown in FIG. 3, air
holes 13 are provided in the dust cap 12 to eliminate the rise of the sound pressure frequency
characteristics, but sufficient effects can be obtained. It was a big one. The present invention
eliminates the above-mentioned conventional drawbacks. Hereinafter, an embodiment of the
present invention will be described with reference to FIG. 4 to FIG. The basic configuration of the
speaker is the same as that shown in FIG. 1, and the difference is that the lower gasket 7 is
provided with several radial vents 14 so that the low pressure portion of the sound pressure
frequency characteristic of the medium sound speaker is raised. As shown in Figure 6, it is lost.
The size, spacing, and shape of the vent holes 14 are determined by the size I of the speaker, etc.,
and the air pressure during operation of the cavity on the back of the diaphragm 8 is adjusted to
lower the sound pressure frequency characteristics. It is about trying to get rid of sorrow.
In addition, with this configuration, even if it is incorporated in a closed box together with a bass
speaker and a treble speaker, the air pressure of its own bank cavity is not affected by the air
pressure generated on the back side when the bass speaker operates. Adjustment will be made.
As described above, since the speaker according to the present invention is configured, when it is
incorporated into one box together with a bass speaker etc. and used, the influence of air
pressure fluctuation due to the loudspeaker C low bass speaker may be affected. The sound
pressure frequency characteristics of the low frequency part are flat and not flat, and can be flat
and have characteristics, and the cross with the bass speaker can be made the best, etc., with
practical value It will be a big thing
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