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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a conventional constant
current drive type speaker device, FIG. 2 a-e is an operation explanatory diagram of FIG. 1, and
FIGS. FIG. 3 is a circuit diagram of the speaker driving device, FIG. 4 is a longitudinal sectional
view of an essential part of the speaker, and FIG. 5 is an explanatory view of a winding state of
the voice coil. 1a ииииииииии Speaker, 2a ? * 2b ииииии First and second voice coil, 4a иииииии Constant
voltage amplifier, 9 ииииии Voice coil bobbin, 13 ииииииии First and second conducting wires, + иии 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 inverted input terminal (feedback signal input terminal).
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
system driven by an amplifier with current feedback. The voice coil of the dynamic speaker is
surrounded by a material waiting for hysteresis, such as a 7 / ter pole or a plate. Therefore, when
the speaker is driven at a constant voltage, the input signal frequency is constant and (11) '(- Also
in the 9 V, the reluctance changes according to the magnitude of the direct current of the voice
coil current, resulting in non-linear distortion of power. Since it is found that Fil is a 6-pulse
change, and constant voltage 5 drive does not eliminate the non-linear distortion, adoption of a
constant 1-flow amplifier 1-driven with-и ft flow regardless of the voice coil impedance
Conceivable. However, as shown in FIG. 1, a resistor (3) for current detection is interposed in
series with the voice coil (2) of the speaker (1), and the voltage across the resistor (3) is In the
constant current driving amplifier 1i configured to input power to the feedback signal input
terminal (-) of the unit (4), it is impossible to compensate for the 4 / impedance change with
respect to the input signal frequency and the input signal level. 1 ? 2 ta ta + does the input
stone frequency constant and change the impedance when the input signal frequency +, i1 is
changed? It shows that the impedance change is caused by the inductive effect of the voice coil. )
(, F, + represents the lowest resonance frequency, and (2 и) represents the nominal impedance.
Also, Fig. 2 tel waveform IAlu) l is that (2) + J? '+. -, + UL: The change in impedance when the
input signal level changes in magnitude is shown, from which the change in motional impedance
can be confirmed. Cf, :) (f0 ? ?) d indicates the lowest co-frequency and eight-wave number
when the human power signal level is small, and the lowest co-imaging wave number of one
combination where the input signal level is large. As described above, since the impedance
changes according to the level of the human power signal and the magnitude of the input signal,
the feedback signal is set in a single (all in series with the C speaker and the resistor (3). As
shown in FIG. 2C, when the speaker is constant (as shown in FIG. 2C), the frequency
characteristic fluctuates with the change in impedance, and a flattened characteristic can be
obtained. In addition, it is necessary to interpose a configuration C in FIG. 41 (one current
detection abrasive (3) in series with the voice coil 1.2) to drive one constant flow of one speaker
(1). Therefore, the drive power o- and 4 are consumed by the resistor (3), and the 1-7 v 'c drive
force can not be efficiently applied.
Therefore, the present invention has been made in view of the above-mentioned defect VC @, and
can flatten the frequency characteristic. In addition, a speaker drive (3) ++ moving device capable
of constant current drive with less loss is provided. An embodiment of the present invention will
be described below with reference to FIGS. 3 to 5. FIG. 3 shows a speaker drive circuit, and (4a) is
a constant voltage increaser, a non-inverted input terminal as a signal input terminal), an
inverted input terminal 1 as a feedback signal input terminal and an output terminal Have 1. A
drive voltage 1el is generated between the output terminal -F and the ground. (1a) is a speaker,
and as shown in FIG. 4, a bobbin 1111 H ? disposed in a magnetic space with a large magnetic
flux density, which comprises a magnet +51, a yoke (6), a plate tel, and a ball (8) Has bifilar
wound and serially connected first and second whistle 1-yl (2a) (2+)), and moves cone 1101k by
magnetic action. Note that +11 is movable in the direction of the cone 1 + 01k arrow C (a
support 7b, and 1121 is a cone whose periphery is a cone, ?f 'connected to the IOI). FIG. 5
shows the connection condition of the 41% second voice coil (2a) (2b), and the end (tab) of the
first conduction + ti 113 constituting the first voice coil (2a); the second The start points (1e) and
(4) of the second conductive wire forming the voice coil (20) are connected in series so that the
winding direction is the same, the connection point and the first winding ( The end (ltb) of the
second conducting wire +41 is connected to the start point of 1: 1 (13a) or to the inverted input
Kerr pole (?) of the amplifier (4a) and the output terminal, and the end (ltb) of the second
conducting wire +41. Therefore, the drive current from the amplifier (4a) flows through the
series connection of the 41st and 1st-2 voice coils (2a) (2tl), and the 11th! 1, the second voice
coil (2a) (2H, g power by the wedge acts in the same direction. In addition, the voltage across the
second voice coil (2D) (e acts as a feedback signal for the stage '# A4 (4a), or by the input 11
frequency a and the human power signal level) Even if the impedance of the speaker (IIL)
changes due to the influence of the inductive and motional impedance of the conduction line unia
+, it is possible to compensate for this and the frequency characteristics can be flattened. As
shown in FIG. 41, it is not necessary to interpose the resistor 4 (3) in series with the voice coil
(2), or the driving force by the amplification 1 (4a) can be effectively used.
In the case of a 10-fold resistance case, the first one. Second conducting wire (1 ? ? is (5) ?
il?? Mi voice coil bobbin lll Ic bifiler winding one, or 4 I, the second conductive wire is
separately wound on the voice coil bobbin (ri), and the winding direction of the first conductionand 12 conduction is the same It may be connected in series in such a way that the turn ratio of
the first and second conducting wires is increased, and the advantage of the device (4a) is
determined until it is lost. As described above, according to the present invention, the first coil is
wound around a voice coil bobbin. A speaker with a proper 2 conducting wire and a constant
voltage amplifier with a 4 will input terminal are sweetened, and the first *. In addition to
connecting one page so as to become Lli-, the nuclear connection is connected with the abovementioned 4 ? f ?, and the output of the constant voltage amplifier causes the first conductive
wire and the second conductive wire. Series connection body (I-drive is performed, so it is
possible to flatten the C frequency characteristics during the formation of a groove or not (to
reduce distortion and effectively use magnetomotive power 0 It can be done.
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