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JPS5326117

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DESCRIPTION JPS5326117
Description 1, title of the invention
スピーカ
3. Detailed Description of the Invention The present invention relates to a loudspeaker. The
conventional dynamic speaker has a sound pressure characteristic A and an impedance
characteristic B as shown in FIG. That is, the lowest resonance frequency f of the speaker. In the
vicinity, the back electromotive force generated by the voice coil vibrating in the magnetic field is
maximized, and the impedance viewed from the input end shows a maximum value. Since the
speaker is generally driven at a constant voltage, the sound power becomes smaller near the
lowest resonance frequency f and the sound pressure level becomes lower. As the magnetic
energy is increased to increase the efficiency, the back EMF becomes larger and the lowest
resonance frequency f. The sound pressure level in the vicinity is lowered, resulting in a so-called
low Q over braking state, which is disadvantageous for bass reproduction. However, the object of
the present invention is the lowest resonance frequency f of the speaker. It is providing a speaker
in which the sound pressure level does not fall near. One embodiment of the present invention is
shown in FIG. This speaker has first and second voice coils VC □ and VC2 wound around a
bobbin, and the lowest resonance frequency f of the speaker. A parallel resonant circuit P (L, C0)
connected between the respective ends of the first and second voice coils VC, VC having a
resonance frequency equal to and a lowest resonance frequency f of the speaker. And the first
voice coil vC and the parallel circuit of the parallel resonant circuit P are connected in parallel
and in series to form a first series resonant circuit S □ (L3. C3) and the lowest resonance
frequency f of the speaker. And a second series resonant circuit 52 (L3.L3) having a parallel
frequency in the series circuit of the second voice coil C2 and the parallel resonant circuit P. C3)
and a resonance sharpness adjusting resistor R connected in parallel to the parallel resonance
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circuit P. As shown in the voice coil C, vc, u 43, it is preferable in production whether it is
possible to draw out the lead of the winding start and the winding end of each layer of the twolayer winding. In the circuit of FIG. 2, the lowest resonance frequency f of the loudspeaker. In the
vicinity, since the impedance of the series resonant circuit S, S2 becomes smaller and the
impedance of the parallel resonant circuit P becomes larger, the voice coil VC and VC3 are
connected in parallel as in the circuit shown in FIG. Is in a lowered state. -The lowest resonance
frequency f of the speaker. In the other area, the impedance of the series resonant circuit S □, S2
becomes larger and the impedance of the parallel resonant circuit P becomes smaller, so the
voice coil VC and VC3 are connected in series as in the circuit shown in FIG. In the normal state.
As a result, the measurement results of the sound pressure characteristic and the impedance
characteristic E when the constant voltage drive input is applied to the speaker having the circuit
configuration of FIG. 2 become a curve shown by a solid line in FIG. The dotted line is the
characteristic before improvement. As is apparent from this figure, the lowest resonance
frequency f of the speaker. It can be seen that the impedance drops in the vicinity and the sound
pressure rises. The lowest resonance frequency f. The same result can be obtained by increasing
the input in the vicinity, but it is impossible if the amplifier does not have an output margin, and
in the case of this embodiment, the output of the amplifier remains constant and the lowest
resonance frequency f. According to the speaker of the present invention, two voice coils are
connected in parallel in the vicinity of the lowest resonance frequency of the speaker, such as 0
or more, which has a large practical effect in that the front and rear acoustic power can be
increased. Since the impedance is reduced, it is possible to avoid the reduction of the sound
pressure level near the lowest resonance frequency of the speaker.
4. Brief description of the drawings. FIG. 1 is a general characteristic diagram of a dynamic
speaker, FIG. 2 is a circuit diagram of one embodiment of the present invention, FIG. 3 is a
perspective view of a voice coil, FIG. FIG. 6 is an equivalent circuit diagram of FIG. 2, and FIG. 6 is
a characteristic diagram of FIG. vC, VC3 · · · voice coil, P · · · parallel resonant circuit, S Yu · S · · · · ·
series resonant circuit attorney Attorney Kanei Ii EndPage: 2
12-05-2019
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