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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an example of a
conventional mechanical two-way speaker, and FIG. 2 is a cross-sectional view showing an
embodiment of the mechanical two-way speaker of the present invention. Three figures are the
top views. 4 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
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of mechanical two-way speakers. One mechanical, two-way speaker is, for example, as shown in
FIG. That is, the magnetic circuit l. A substantially conical bass diaphragm 4 ? ? is fixed to the
mounting edge 2A of the frame 2 fixed to the L portion via the enon 3 via 1?g, rJY ? ? 995),
and the bass diaphragm 4 ? ? is coaxial + substantially conical The voice coil bobbin 7 is
formed by shaping the high-tone diaphragm 5 of the shape through the edge 6 and is fixed to the
inner peripheral edge portion of the bass diaphragm 4 ? ? and the high-tone vibrator 5 and the
outer periphery of the voice coil bobbin 7 The Heus coil 8 is inserted into the magnetic gap IA of
the magnetic circuit l. In addition, 9 is a center cap and 10 is a damper material for supporting
the voice coil bobbin 7. In such a speaker, the bass diaphragm 4 ? ? does not follow sufficiently
in the high range, and the treble vibrator 5 mainly vibrates, and in the low range, the treble
diaphragm 5 and the bass diaphragm 4 It is a feature of this speaker that "vibrates together".
However, in the above-mentioned conventional mechanical two-way speaker, it is in the high
range. The sound pressure frequency characteristics due to the vibration of the diaphragm for III
sound 5 have interference due to the sound pressure from the conical diaphragm 4 + located
behind the treble diaphragm, and flat characteristics are obtained. It was not. 99G-1 This
invention was made in view of the points as described above C. Its purpose is to flatten the sound
pressure frequency characteristics in one pitch range of the high-tone diaphragm and use one
voice coil. The object of the present invention is to provide a mechanical two-way speaker having
a lightweight and rigidly vibrating vibration system capable of sufficiently driving two
diaphragms. Hereinafter, an embodiment of the present invention will be described according to
FIG. The low frequency diaphragm 4 includes a conical sub cone 11 such as a circular vertebra
and a pyramid, and a sub cone 11. h is made of a lightweight material 12 made of a synthetic
resin foam with a large internal loss, the surface 12a of the light weight material 12 is formed
substantially flat, and the inner circumferential wall 12b is opposed to the rear surface of the
high sound diaphragm Is formed in a substantially circular shape along the back surface. The
inner peripheral edge of the sub cone 11 is bonded to the voice coil bobbin 7 using an adhesive
or the like, and the outer peripheral edge is fixed to the mounting edge 2 A of the frame 2 via the
edge 3. The outer peripheral edge of the lower end of the lower material 12 is supported by the
L-plane inner edge portion of the light-weight material 12 by means of the edge 6. Further, the
planar shape of the low frequency diaphragm 4 is a square or a rectangle as shown at 99th in
3M, and the vibration area is enlarged as compared with the circular one.
Now, if voice current is supplied to voice coil 8 again, voice coil 8 receives force in magnetic gap
IA as in the conventional mechanical 2-way speaker, but vibrates in the high range, but it is a
diaphragm for high-pitched sound 5 mainly vibrates, and in the low frequency range, the high
frequency diaphragm 5 and the low frequency diaphragm 4 both vibrate. In this case, since the
radiation surface of the bass diaphragm 4 coaxially provided around the conical treble
diaphragm 5 is formed flat, as shown in FIG. 1, the treble diaphragm 5 and the bass are arranged
as shown in FIG. The sound pressure frequency in the high frequency range by the conventional
double cone type mechanical 2-way speaker and the double high frequency sound diaphragm 5
coaxially overlapped with the vibration diaphragm 4 is disturbed by interference with the low
frequency sound diaphragm 4 It is possible to obtain sound pressure frequency characteristics in
a flat high-pitched band without. The present invention is as described above, and since the bass
diaphragm is flat, the sound pressure from the bass diaphragm does not interfere with the sound
pressure of the treble diaphragm in the high-pitch range, and the flat 99S to Since high
frequency '#' partial pressure frequency characteristics can be obtained and the diaphragm for k
bass is filled with a lightweight material on the sub-cone, it is possible to make a lightweight
mechanical two-way speaker as a whole. The inner peripheral wall of the lightweight material is
generally circular along the back surface of the conical high-tone diaphragm, so the bass
diaphragm is rigid in overall H without concentration on the outer peripheral part In addition,
the gap for amplitude of the high-tone diaphragm can be taken sufficiently, and it is extremely
effective as a mechanical two-way speaker widely spread outward from the common voice coil
bobbin. is there.
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