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JPS55115189

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DESCRIPTION JPS55115189
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the
construction of an embodiment of a loudspeaker for headphones with a loudness control device
according to the present invention. 1 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 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 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 ииииии Voice coil, 7.9 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
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knob.
DETAILED DESCRIPTION OF THE INVENTION In the present invention, the volume of the air
chamber between the center pole of the magnetic circuit of the dynamic type speaker and the
diaphragm of the central portion is changed to a high-frequency speaker unit for high-frequency
reproduction. The present invention relates to a headphone speaker having a loudness control
device which enables the level to be varied in a partial frequency (1) ?7 band. In some of the
commercially available headphones, the low-range loudness effect can be realized by changing
the size of the window through which the air in the chamber between the center pole of the
magnetic circuit and the diaphragm escapes through the damping material. The ones that are
made known are known. However, in the audio frequency band, headphones exist that can
control loudness only in the mid band. The present invention has been made in view of the above
points, and aims to provide a loudspeaker for a headphone with a kill loudness control device
because the loudness control is carried out by manually operating the mechanical loudness effect
by manual operation. I assume. Hereinafter, an embodiment of the loudspeaker for headphones
with loudness control device of the present invention will be described based on the drawings.
The figure is a cross-sectional view showing the configuration (2) of the one embodiment. In the
figure, l is a yoke plate. The yoke plate 1 is formed in a donut plate shape, and a center ball 2 is
attached to the central portion thereof. The center ball 2 is formed in a cylindrical shape. A
magnet 3 is disposed near the outer periphery of the yoke plate 10, and the center ball 2 and the
magnet 3 are coaxially wound. The center ball 2 is fixedly attached to the center portion of the
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magnet 3 at a predetermined interval td) IVc. ???????????? ???????? York
play) 1! : Also Ka air circuit is formed. Incidentally, the ball 2 and the plate 1 may be formed into
one body. On the other hand, 4 is a frame formed in a donut plate shape, and a plate 5 formed in
a donut plate is attached to the inner peripheral surface of the frame 4. The back surface (right in
the figure) of the plate 5 is fixed to the magnet 3. In the gap between the inner peripheral surface
of the plate 5 and the center ball 2, a port (3) chair coil 6 is inserted. The voice coil 6 is attached
to the diaphragm 'IK @ of the center dome portion. The diaphragm 7 is formed into a single
spherical shape as clearly shown in the figure, and is disposed at a position facing the center pole
2 at a predetermined interval.
Therefore, an air chamber 8 is formed in the opening of the diaphragm 7 and the center pole 2.
The outer peripheral edge of the diaphragm 7 is bonded to the diaphragm 9 of the body portion.
The outer peripheral edge of the diaphragm 9 is fixed to the seventh frame 4. The above
configuration is the same as that of the conventional O-dynamitor type headphone speaker.
However, this invention is characterized by the following points. In the center pole 2, the valve
10 is provided so as to be movable in the axial direction. A rod-shaped knob 11 is attached to the
center of the back surface (right II in the figure) of the valve 10. The knob 11 is inserted into the
center pole 2 and is projected to the outside through the center portion of the center pole 2 and
the center of the yoke plate 1 (4). It can operate in the direction. Thus, providing the W1 valve
10 and the knob 11], in the state shown by the solid line in the figure, in the center dome
portion, an air chamber 8 formed between the diaphragm 7 in the central portion and the valve
10 Although the volume is the smallest, when the knob 11 is operated in the arrow A + direction
and moved to the position shown by the broken line, the valve 10 is also in the center pole 2 and
the arrow A! Move in the direction and come to the position shown by the broken line. As a
result, the volume of the air chamber formed between the diaphragm 7 and the valve 10 is
maximized. Thus, the volume of the air chamber 8 between the moving plate 7 and the valve 10
can be made variable by operating the knob 11 to move the valve 10). By making this volume
variable, it is possible to change the sound pressure level of the headphones. Accordingly, in the
audio frequency band, the sound pressure level can be varied (5) in a partial frequency band,
specifically, in a mid frequency band around IKHz. That is, when the valve 10 comes to the
position of the broken line in FIG. Thus, it is possible to obtain low and high frequency loudness
effects that relatively fall within the entire audio frequency band. In the above embodiment, as is
apparent from the drawing, the case of the external magnetic layer is illustrated, but it goes
without saying that this invention can be applied to the case of the internal magnetic type, and
the operation of the knob 11 is slide type Needless to say, the screw type may be used. In the
case of the screw type, the knob ll itself is a screw rod, and the outer peripheral surface thereof is
screwed to the inner peripheral surface of the center pole 2 or screwed at the part passing
through the yoke pre, i-) 10. Good.
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As described above, according to the present invention, according to the present invention, the
volume of the air chamber to be WCS-arranged between the center of the dynamic speaker and
the back surface of the diaphragm is moved by operating the knob attached to the movable valve.
To change the partial pressure of audio frequency band (6) to change the pressure bell of the
audio frequency band, so the overall low and high frequency loudness effects are not electrical It
can be obtained mechanically only by manipulating the k weights when the listener desires.
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