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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view showing a conventional
speaker, FIG. 2 is a cross sectional view showing one embodiment of the speaker of the present
invention, FIG. 3 is an exploded perspective view thereof, FIG. C is sectional drawing of three
types of back cavity adjustment bodies used for the same speaker, FIG. 5 is a sound pressure
frequency characteristic figure of the speaker of the prior art and this invention. 11 иииии Magnetic
circuit, 15 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 engagement engagement , 19
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ? ,
26... Through hole, 27 .. .. back cavity adjustment body, 28 .. .. coupling protrusion, 29 .. through
DETAILED DESCRIPTION OF THE INVENTION The present invention makes it possible to attach
and detach a diaphragm to a frame coupled to a magnetic circuit and to which a hook cavity
adjuster for adjusting a back cavity on the back of the diaphragm is attachable. It relates to a
speaker that can be adjusted. The conventional speaker is configured as shown in FIG. The frame
5 is attached to the magnetic circuit 4 configured by incorporating the columnar magnet 2 and
the pole piece 3 in the yoke 1, and the diaphragm 7 having the outer ring 6 is fixed to the frame
5. A voice coil 9 which fits into the magnetic gap 8 of the magnetic circuit 4 is coupled to the
central portion of the diaphragm 7. In such a speaker, the cavity on the back of the diaphragm
can not be adjusted, and the sound pressure frequency characteristic is indicated by the broken
line a in FIG. 5 only by adjusting the back load by the through hole 10 provided in the frame 6.
As shown in the figure, audible peaks were generated around 2 KHz. From such a thing, in order
to make the back surface cavity of diaphragm 7 small, the shape of diaphragm 7 and the shape of
frame 5 are examined, but neither can maintain stable good performance, and practicability It
was poor. The present invention also eliminates the above-mentioned conventional drawbacks),
and an embodiment of the present invention will be described below with reference to FIGS. 2 to
4 of the drawings. A magnetic circuit 11 includes a yoke 12, a columnar magnet 13 and a pole
piece 14. A frame 15 made of synthetic resin or the like is coupled to the upper portion of the
magnetic circuit 11, and a coupling hole 16 is provided at the inner edge portion thereof, and a
plurality of engaging projections 18 are formed on the inner wall of the rising portion 17 on the
outer periphery. ing. A diaphragm 2 o is coupled to the frame 15. A hard outer ring 21 is fixed
downward of the peripheral portion of the diaphragm 2o. In addition, a terminal tongue 22 fitted
to the notch 19 of the frame 16 and projecting to the outer periphery of the frame 16 is
integrally provided in a part of the outer peripheral portion of the outer peripheral ring 21. Is
provided. A voice coil 26 fitted to the magnetic gap 24 of the magnetic circuit 11 is coupled to
the central portion of the diaphragm 2o. The lead wire to the voice coil 26 is connected to the
terminal 23. The diaphragm 20 provided with the outer ring 21 is embedded in and coupled to
the lower surface of the engagement projection 18 of the standing-striking portion 17 of the 7
frame 15 and the inner bottom surface of the frame 15.
That is, the diaphragm 2o provided with the outer peripheral ring 21 is press-fitted into the
rising portion 17 of the frame 15, and the engaging protrusion 18 is passed over and firmly
fitted between the lower surface of the engaging protrusion 18 and the inner bottom surface of
the frame 15. Combined. Further, several through holes 26 are provided in the frame 15, and a
bank cavity adjusting body 27 for adjusting a back cavity on the back surface of the diaphragm
20 is incorporated in the inner bottom portion of the frame 15. The back cavity adjusting body
27 is a ring body whose upper surface has a shape similar to that of the diaphragm, and a
coupling projection 28 press-fitted into the coupling hole 16 of the frame 15 is provided on the
lower surface of the central portion. A through hole 29 is formed at a position corresponding to
the through hole 26 '. This back cavity adjustment body 27 is shown in FIG. 4A. As shown in B
and C, five different ones from the heights H1, H2 and H3 are prepared and incorporated into
the frame 15 so that the sound pressure frequency characteristics as a speaker are as shown by
solid lines A, B and C in FIG. It can be adjusted. The characteristics A, B and C in FIG. 5 show the
case where the back cavity adjusting member 27 of A, B and C in FIG. 4 is used. That is, as the
height of the back cavity adjustment body 27 is used, the sound pressure frequency
characteristic decreases in the peak near 2 KHz and is flattened, or the input 6 ░, the air circuit
2 ? ? J ? C E-J '! The voice coil is equipped with an outer peripheral ring on the frame that has
made a ""-"" 4)). Since the combined diaphragm is made removable and the adjustment body for
adjusting the back cavity of the diaphragm is coupled to the-? ? inner bottom of this frame,
some back cavity adjustment bodies are prepared and replaced Control of sound pressure
frequency characteristics is adjusted according to the content to be measured and reproduced, or
according to the preference of the listener и 8 1 '' '1 1 = f \ tt [t ~ 6 "' fe, eba 6? ! ??? j can be
rich in stiffness.
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