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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional flat
diaphragm type speaker, FIG. 2 is a cross-sectional view of an essential part of one embodiment
of the present invention, and FIG. It is. 5 ··· · · · Flat diaphragm, 6 · · · · · · · · · ·.
DETAILED DESCRIPTION OF THE INVENTION The present invention is a flat diaphragm type
using a flat diaphragm. It relates to the improvement of the force. In general, the flat diaphragm
is more likely to clearly generate the resonance mode due to its shape compared to the
conventional cone type vibration / sustain plate, and the peak dip of the frequency characteristic
is also larger than that of the cone type vibration. Therefore, in the conventional speaker of this
type, a viscous substance having a suitable damping effect has been applied to the front and back
surfaces or the core portion of the diaphragm as a measure against this peak, or partial mass
addition or the like has been performed. However, in such a conventional method, the frequency
characteristic (1) ..-) 47 '? "Sufficient effect can be obtained to reduce your peak, but on the other
hand, if you use the viscous material of the former, the signal response of the diaphragm will
deteriorate, which will lead to the deterioration of the sound quality, and the latter It is a
drawback that it may cause low sound pressure level on the island. The present invention has
been made in view of such a point, and it is an object of the present invention to reduce peaks
appearing in frequency characteristics when using a damping agent or adding a mass in a flat
diaphragm type speaker. The invention will now be described according to an embodiment
shown in the drawings. Fig. 1 shows an example of a typical loudspeaker using a conventional
flat diaphragm, where / is yaw, 2 is 7 gnenots, 3 is a plate, 3 is a frame, j is a planar diaphragm, g
is an edge Reference numeral 2 denotes a voice coil bobbin, ♂ denotes a voice coil, and 2
denotes a damper, whereby a flat diaphragm type speaker is formed. FIG. 2 shows an
embodiment of the present invention in which the speaker of FIG. 1 is improved. In this case, in
particular, the rear surface of the junction with the edge 2 of the peripheral portion of the plane
diaphragm j is cut off (2) The stepped portion is processed by applying a nitrile rubber-based
viscous substance 10 to the stepped portion. The front outer diameter of the plane diaphragm j
will now be described by way of example of the case where the present invention is applied to a
slider having a diameter of 30 cM. , 23311 =, aid back surface outer diameter D1 by -23. When
the thickness B is 1 step collar thickness A is 7 M, and the nitrile rubber of sp is applied to the
peripheral steps of the hand-made diaphragm, the frequency characteristic is as shown by the
thick line in FIG. It is clear that the peak at around 1.2 KH2 is almost completely removed as
apparent from comparison with the characteristics of the conventional product shown by the
alternate long and short dash line. In this case, the average caesarean level did not change at
10θ and 7 dB both, and the resonance illusion Qm also did not change at 33 both, so the
internal loss did not change either. The wavy line in FIG. 3 indicates the characteristics before
application of the viscous substance / θ by merely giving the right to processing the peripheral
portion of the hand-held diaphragm j, and in this case the peak at around 2 KHz. Sufficiently low
but sufficiently high) 3) can be said, it will also be seen that there are still a few congruent peaks.
In the present invention, as shown in L (this step portion of the peripheral portion of the flat
diaphragm (this viscous material is applied, or the diaphragm of the signal transmitted to the
peripheral portion of the diaphragm by applying this viscous material) It has the effect of
reducing reflection to the central part, which is fundamentally different from the conventional
case where it is used as a damping agent for the front and back of the diaphragm or inside the
core, and does not change the characteristics of the diaphragm itself. There is no negative impact
on the sound quality. According to the flat diaphragm type speaker of the present invention, the
stepped portion is processed at the peripheral portion of the flat diaphragm as described above,
and the sound quality is deteriorated only by applying the stepped portion G viscous substance
and penetration. The present invention exerts a very excellent effect on the peak removal of the
frequency characteristic unique to the flat diaphragm without causing a decrease in sound
pressure level or noise level.
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