JPS54134028

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DESCRIPTION JPS54134028
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a horn type
loudspeaker according to the present invention. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 10 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
Magnetic gap, 8, 12 · · · voice coil, 9, 13 · · · · · · · · · · · · · · · · · · bifurcation point. Correction 53. ・
5. 13
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn type
speaker using two driver units in one KL fc horn so as to reduce harmonic distortion, particularly
second harmonic distortion as much as possible. As is well known, a general-purpose
electrodynamic speaker is affected by magnetic non-linearity near the coil when the voice coil is
moved in the magnetic gap by the electrical input (') image-/ 3' / θI, 7-i. As a result of distortion
of the current flowing through the voice coil, the radiated sound is also distorted to generate
harmonics. Conventionally, the horn 朦 speaker in which each driver unit is attached to two
throats branched from one horn is connected so that both driver units have the same structure
and the movement of the voice coil is also in the same direction. Therefore, as a result of the
current distortion being enhanced, harmonic distortion, particularly second harmonic distortion,
has a drawback of being increased. The purpose of this study is to reduce the above-mentioned
harmonic distortion, especially the second harmonic distortion as much as possible. By arranging
both voice coils in series or in parallel so that they are disposed opposite to each other and
located at the same distance from the branch point of the horn and one of the diaphragms can
vibrate in the same direction, The current distortion generated due to the relationship between
the magnetic circuit and the voice coil, and (2) are intended to mutually cancel the
magnetostriction and reduce the second harmonic as much as possible. The present invention
will be described in detail by the illustrated embodiment. The horn 1 is branched into two at a
predetermined angle from the branching point O at the thinning portion side, 2a and 2b are
branched throats, 3 is a horn mouse 2 Driver units 4.5 are attached to the above-mentioned
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throats 2m and 2b respectively, but one driver unit 4 is a voice coil in the magnetic gap 7 and
the magnetic gap 7 of the magnetic winding W & 6 like the general-purpose driver unit. 8. All the
diaphragms 9 to which the limb voice coil 8 is attached are disposed on the throat 2a side by
their own weight. On the contrary, in the other driver unit 5, the voice coil 12 in the magnetic
gap 11 and the magnetic gap ll of the magnetic circuit 10 and the diaphragm 13 to which the
voice coil 12 is attached is disposed facing the opposite side to the throat 2b. When attaching
both driver units 4 and 5 to their respective springs 2m and 2bK, the respective driver units 4
and 5 # 'i respectively have their respective diaphragms 9 and (3) -13. It is necessary to K so that
the top is located at the same distance from the horn 10 branch point O.
Here, as described above, the other driver unit 5 also has the magnetic circuit 5 in the opposite
direction, so that the center ball 5a can throw the through hole 14 of the same diameter as the
center ball 5a so that the vibration of the diaphragm 13 can be radiated to the throat 2b. Form.
The voice coils 8 and 12 of both driver units 4.5 are connected in series or in parallel so that
both diaphragms 9 and 13 can vibrate in the same direction. That is, the connection is made so
that the directions of the currents flowing through both voice coils 8 and 12 # 'i and the voice
coil 8.12 are opposite to each other. Therefore, when an electrical input is applied to both voice
coils 8.12, both diaphragms 9 and 13 vibrate in the same direction, so that the fundamental wave
is synergistically increased. On the contrary, since both voice coils 8 and 12 and the company
each move in the opposite direction in the relationship between the magnetic gaps 7 and 11,
current distortion or magnetostriction caused by the relationship between the magnetic circuit
and the voice coil is generated. Is a bat (4) '-\. As a result, harmonic distortions, in particular
second harmonic distortions, become very much reduced with respect to the fundamental wave
K. If a short ring of copper or the like is attached to the center ball of the magnetic circuit 6.10 in
both driver units 4.5, the third harmonic distortion can be simultaneously reduced. Since the
present invention is configured as described above, in the case of using two driver units 4.5 for
one horn l to increase sound pressure and input, it has no effect on the fundamental wave.
Without the harmonic distortion, the second harmonic distortion can be reduced as much as
possible.
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