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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are cross-sectional views showing the
main parts of an embodiment of the present invention. In the figure, 1 · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · speaker structure, 4 · · · · voice coil, 5 · · · · · · · It is. 5 Fang [1 figure 21 end one 111-real
opening 48-101 644 (2) correction correction 47.9 · · · 30
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of the
ring-shaped edge supporting the driver's diaphragm in a horn-type speaker. The characteristic
feature of the dome-shaped diaphragm, which has long been used as the diaphragm of the driver
for horn type speakers, is that the lowest coincidence frequency is the edge of the dome
supporting the dome-shaped diaphragm on the speaker structure. It is determined by the elastic
properties of the material and the dimensions of the diaphragm, and it is the influence of the
edge antiresonance on the valley in the midrange. Furthermore, the upper limit is due to the
resonant frequency of the dome-shaped diaphragm and not due to the shape 1 dimension of the
edge JQ-1n1DAaM / 1! ことである。 The support of the dome-shaped diaphragm depends on
the crushing of the shell, and no need for a chassis, especially a damper. The diaphragm and the
edge are often made of the same material. Since the voice coil is provided at the junction of the
diaphragm and the edge, it is different from a cone and drives the periphery of the diaphragm.
Also, assuming that the dome-shaped diaphragm moves in a piston, the dome-shaped diaphragm
is subjected to mechanical vibration similar to the principle of operation of a cone speaker in a
frequency band where the wavelength is sufficiently large compared to the diaphragm size.
Resonant frequency specific to the dome part and the edge part. If it appears as a peak and valley
in the sound pressure characteristics above medium sound with a common mode, for example, a
valley is created in the pressure drop characteristics near the resonance frequency of about 8 K
at the edge and directivity C 930 °, 60 ° It is considered that the sound pressure
characteristics of the above are disturbed, and the diaphragm vibrates uniquely. This disturbance
is due to the resonance of the edge part, and the vibration near this co-fitting frequency is II
noise compared to that near the frequency of the upper limit. The dome part is a rigid disk, and
the edge part is a driver with a structure of a ring-shaped edge having elasticity of 48-1 nl R47 Inq3. From the above, it is considered that the compliance of the edge is a problem, and to control
the compliance of the edge, which has been devised by making a 9 ° curved shape in which the
edge portion is corrugated, by changing the thickness of the edge. It is possible but it needs to be
thin to get high compliance. However, if it gets thinner, it becomes harder to control the vibration
at low frequencies. Conversely, make the edge thicker. The lower the compliance, the higher the
lowest resonance frequency and the lower the frequency can not be reproduced.
This invention relates to the improvement of the above-mentioned edge portion, and in order to
keep the compliance of the edge at the best and to make the valley of the line midrange and the
disturbance of the sound pressure characteristics smaller, the shape of the edge is tapered. The
present invention relates to a horn type speaker characterized by An embodiment of the present
invention will be described based on the following drawings. In FIG. 1, reference numeral 1
denotes a dome-shaped diaphragm which is supported on a cis-beaker structure 3 by a tapered
edge 2. The speaker structure 3 is supported by the thinner portion of the edge 2 so that the
edge 2 Fi is formed so as to become thicker toward the inside of the passage p shown in the
figure, that is, in the direction of the diaphragm. Reference numeral 4 denotes a vibrating plate lt-driven whist coil, and reference numeral 5 denotes a magnet. With the above configuration, the
portion supporting the diaphragm l at the edge 2 is thick, so there is no hindrance to the
reproduction of the high-frequency range, and the high frequency can be reproduced. In addition,
since the portion fixed to the speaker structure 8 is thin in the low frequency range, compliance
sufficient for reproduction can be obtained at that vibration. Furthermore, although the valley of
the midrange is largely affected by the width of the edge, the widening of the ridge is easy to
select by tapering. At the same time, the resonance frequency of the edge is dispersed to some
extent without concentrating on one point like the normal flat plate edge, so the extension of the
high-pitched range etc. can be easily changed by the degree of tapering of Ol. The mass of the
edge can be less than that of the flat plate, and its manufacture is relatively simple. なお! As
shown in Fig. 2 (the same configuration as Fig. 1 !!! It goes without saying that it is also possible
to reverse the direction of the tapers (elements are indicated by the same symbol). As described
above, this device is a horn-type sneaker that has the effect of improving the linearity of the
sound as a whole by tapering the edge and improving the resolving power and hearing fatigue.
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