JPS583392A - Speaker device - Google Patents

Abstract

PURPOSE:To prevent the compression of a dynamic range through the compressed linearity, by splitting a conductor arranged in a magnetic gap into two conductors so that the conductors can generate a driving force in adverse direction with each other. CONSTITUTION:A conductor arranged in a magnetic gap of a magnetic circuit is split into two conductors 1 and 1'. With the conductor of a voice coil, the conductors 1 and 1' are separately wound on a coil bobbin. On the other hand, transistors 2 and 2' are biased and constant DC currents IDC and I'DC flows to the conductors 1 and 1' without no signal application to the bases. When an audio signal or a signal with inverted phase is applied to the base, the currents IDC and I'DC are modulated with the signal, resulting that a correct superimposing the audio current with inversed phase on the currents IDC and I'DC respectively is applied to the conductors 1 and 1'. Thus, the total current is constant as 2IDC and the heat generation for the whole device is made constant, preventing change of resistance value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker device having an electrodynamic speaker unit that generates driving force and radiates sound by passing a current through a conductor arranged in a magnetic gap of a magnetic circuit. In the case of a speaker unit for a speaker device, when an audio signal current is applied directly to a conductor such as a voice coil, a driving force of 5Kt is generated.

However, when a current is passed through the dice coil, it generates di-crystal heat, and this heat causes its own resistance to change depending on the magnitude of the current.For this reason, the dice coil is unable to supply a vowel signal to the dice coil. When this occurs, the signal current, which changes in accordance with the signal change, no longer flows through the voice coil due to the change in the resistance value. Therefore, when a signal has a large amplitude, the necessary driving force to generate sound pressure corresponding to the amplitude is not generated.

The linearity deteriorates and so-called dynamic range compression occurs.In this way, 1 in 1! Among the voice coils with small heat capacity, the problem is that they have low fluctuation efficiency and require a large amount of current to flow through the conductor.
do.

Therefore, various attempts have been made to dissipate the heat generated by the dice coil as quickly as possible, but none of them are fundamental and it is not possible to fully reproduce the dynamic range. Ta.

The present invention has been devised in view of the above-mentioned points, and its purpose is to provide a speaker device that fundamentally eliminates the compression of dynamic range due to deterioration of linearity.

The present invention will be described below with reference to illustrated embodiments.

FIG. 1 shows a*ai of a speaker device according to the present invention,
In the figure, 1 and 1' are the conductor parts that are obtained by dividing the conductor placed in the magnetic gap of the electrodynamic lid speaker KTh and the magnetic WAIiB into two parts.
1' indicates the second mvc (as shown in FIG. 1), the voice fill portions are separately wound on the coil bobbin 10 in a vertically stacked manner.), and the magnetic air of the magnetic circuit 11. The diaphragm 12 is connected to the Ilpobin 10. The conductor portions 1 and 1' have one end at 1g! It is wired and connected to ground. 1゜2
' is an npn transistor as a modulation control element, the collectors of these transistors 2,2'0 are interconnected and connected to the + terminal of the DC power supply 3, and the emitters are connected to the other ends of the conductor parts 1, 1'. each connected. Reference numeral 4 denotes an audio signal source, the output of which is connected directly to the pace of transistor 2 and to the pace of transistor 2' via a phase inversion circuit 5.The transistors 2 and 1' are connected by a bias circuit (not shown). The voice fill portions 1°, 1' are biased and even if no audio signal or its phase inverted % is applied to their pace.

Constant DC current IDO, I! 1G'
are supplied to the conductor portions 1 and 1', respectively, and when an audio signal or its phase inverted signal is applied to those paces, this signal causes the above-mentioned DC currents IN and ZDO' to Modulates, resulting in direct current x o,! ! Currents x and x', in which audio signals of mutually opposite phases are superimposed on 1G', are obtained and supplied to the conductor portions 1 and 1', respectively.

The currents X and XI are applied to one conductor portion 1.1' in opposite directions 111iI, respectively, as indicated by arrows 211, and generate O driving forces in opposite directions in the conductor portion 1.1'. Follow me, I! 10-IDO', the force as a whole is released and the conductor portion 1.1' is not deviated in any direction. Now, the direction of the current I flowing through the conductor part IK is
If positive, the relationship between currents I and X' becomes K as shown in Figure 3, so if the audio signal is IAOeja+t,
Current 1 #1Zoo + IAO@j sail, current I' expansion -
'LsO+IAO・jωt〉, in terms of alternating current, X −i
I' -2
4'-21 KaG.

Therefore, the entire conductor consisting of the conductor portion 1.1' generates a driving force proportional to 1 times the amplitude of the social audio signal, but the current supplied to the entire conductor is 2! Since the constant value is no, the total amount of heat generated is always kept constant.

Assuming that the audio signal applied to the speaker device is 14 as shown in Fig. 4, the conventional O speaker device has a resistance value of KR when there is no signal, but the resistance value of the coil is 1 as shown in Fig. S. However, in the speaker device of the present invention, the resistance value of the conductor is kept constant as shown by the resistance value 11b.

Incidentally, if the resistance value when one signal is manually operated is R, then in the signal-power device, the blade changes, so the compression ratio also changes, resulting in poor linearity, whereas in the device of the present invention, R is constant, so the compression ratio is low. does not change and good y = arity is obtained.

In the embodiment shown in FIG. 2, the voice coil portion 1,
1' is double wound in the same winding direction and has a single magnetic air! l
In the coil part 1°1', two guides are lined up and wound at the same time, and the beginning and end of each winding are placed in the first winding. As shown in the circuit diagram in the figure, it is also possible to have a pie 7 eye roll that is interconnected and connected to the nurse at the ninth point.

In the circuit diagram of Fig. 1, the electric circuit section consisting of the modulation control element 2.2'% phase inversion circuit 5, etc., the power supply section of the O circuit section, etc. are as shown in Fig. 1 T together with the speaker unit. Speaker cabinet 20PiK can be incorporated.

In addition, in the IIIET diagram, 21 is an electric circuit section, 22
1 is a power supply unit, and 13 is an audio signal input terminal. in this case,
Since the electric circuit section 21 can be operated as a conventional power amplifier circuit, the output of the amplifier can be directly applied to the human power terminal 23. Also, when the electric circuit section is placed in the speaker cabinet like this,
It is no longer necessary to connect the power amplifier and the speaker unit with a long speaker cable as in the past, so it is possible to reduce the performance deterioration caused by the speaker cable. A simple device with the same degree of deception or lower is sufficient, so the cost will not be high.As described above, the present invention divides the conductor placed in the magnetic gap of the magnetic circuit into two conductor parts, Direct current is passed through the divided conductor portions so as to generate equal driving forces in opposite directions, and audio signals having mutually opposite phases are superimposed on each of the DC currents O. Therefore, the current that can be supplied to the conductor as a whole is always kept constant, and its resistance value never changes. Therefore,
The disadvantage of conventional methods is that the resistance value of the conductor changes, deteriorating linearity and compressing the dynamic range.
Note that a drive current that changes according to changes in the input audio signal is supplied to the conductor, so that an output sound pressure that is faithful to the audio signal is obtained.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a speaker device according to the present invention, Fig. 2 is a sectional view of a speaker cable used in the speaker device of the present invention, and Fig. 3 is a current flowing through the O conductor of the speaker unit in the WRO device of the present invention. 4 is a graph showing an example of an audio signal, FIG. 5 is a graph showing the resistance value of the conductor of the speaker unit when the audio signal in FIG. 4 is applied, and FIG. 2 is a perspective view showing a modification of a part of the speaker unit shown in FIG. 2, and a cross-sectional view of a speaker cabinet incorporating the device of the present invention. 1.1′...Conductor portion 5...Phase inversion circuit 11-・Magnetic circuit G... Magnetism 22! Pioneer Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] In a speaker device having an electrodynamic speaker unit that generates driving force and radiates sound by passing a current through a conductor arranged in a magnetic gap of a magnetic circuit, the conductor is divided into two conductor parts, and the divided conductor is divided into two conductor parts. A speaker characterized in that a direct current is caused to flow through the parts so as to generate equal driving forces in mutually opposite directions, and mutually opposite phase compensation signals are superimposed on each other like that of the direct current. Device.