JPS4838131

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DESCRIPTION JPS4838131
Patent Office Secretary Bento Takehisado 1, Invention Name Characteristic Variable Speaker 2,
Number of Inventions Described in the Claim, 31, Invention Name 1, Invention Name
Characteristic Variable Speaker
Specification
3. Detailed Description of the Invention The present invention aims to make it possible to adjust
the characteristics of the speaker. The characteristics of a conventional speaker could not be
adjusted after its assembly is complete, so when mounting the speaker on a carnet, for example,
to match the volume of the cabinet etc. with the characteristics of the speaker, the cabinet's
outline You have to choose according to the speaker. Also, in combination with other speakers,
when performing 2-way and 5-way playback, a network was inserted at the power side of the
speaker in order to match at the crossover frequency. EndPage: In the present invention, two sets
of voice coils are provided on one bobbin, and a signal is directly applied to the first coil, while a
capacitor, a coil, a resistor is connected to the second coil, or a short circuit is applied. To make it
possible for the user to change the connection according to the purpose, such as by connecting
the first coil and the second coil in parallel via a capacitor or a coil, so that desired characteristics
can be obtained To eliminate the drawbacks of the conventional loudspeakers. The drawing
shows the characteristics when the first chassis 1 and the second coil 2 are connected in various
ways. As shown in FIG. A-1, when a signal is applied to the first coil 1 and the second coil 2 is
short-circuited, the frequency characteristic and the admittance characteristic thereof are as
shown by a dashed line in FIG. The solid line is the characteristic of the one using a single voice
coil. As can be seen from this figure, the second coil 2 is shorted. Then, the frequency
characteristic is lowered in the high frequency region, and the admittance characteristic is large
in amplitude and below, so that the second coil 2 generates a large back electromotive force. It is
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considered that the current that damps the movement of the coil flows in the second coil 2. Also,
in the high region, the mutual reactance ω M between the first coil 1 and the second coil 2
becomes large, and the reactance component of the first coil 1 is short-circuited by the second
coil 2, so that the apparent admittance characteristic It is considered to be flat. And since the
driving force by the fang 1 coil 1 is also reduced, the sound pressure decreases in inverse
proportion to the frequency 1 number. A-5 shows high frequency distortion, and the solid line
shows the result of using a single voice coil, and the dashed line shows a result of shorting the
second coil 2. As apparent from this figure, the distortion is particularly reduced in the lower and
higher frequencies where the short circuit effect of the second coil 2 appears.
In addition, transient characteristics (especially falling) are also improved. Instead of shorting the
second coil 2, if the coil L is connected to it as shown in FIG. Therefore, the characteristic is as
shown by a dashed line in FIG. Further, as shown in FIG. 0-1, when the capacitor C is connected
to the fang 2 coil 2, the short circuit effect appears only in the high region, and the
characteristics thereof are as shown by the dashed line in FIG. Furthermore, as shown in D-1 in
FIG. 1, if the variable resistor R is connected, the short circuit effect appears in the low band and
the high band and the variable resistor R is adjusted as shown by the dashed line in 1) -2. The
degree can be adjusted. Next, as shown in FIG. E-1, the second coil 2 and the capacitor C may be
connected in series, and may be connected in parallel to the first coil 1. In this case, the current
flowing through the second coil 2 also contributes to the generation of the driving force.
However, since the capacitor 〇 is connected in series to the second coil 2, the effect appears
only in the high region, and becomes a characteristic as shown by a chain line in FIG. It goes
without saying that if a coil is inserted instead of the capacitor C, the level of the low range can
be raised conversely. When the connection of the second coil 2 is reversed in phase as shown in
FIG. F-1, the driving force by the current flowing through the fang 2 coil 2 acts to reduce the
driving force by the coil 1 so that F − As indicated by the dashed line in FIG. 2, the frequency
characteristic is lowered in the high region. FIG. 0 shows a combination of the above-mentioned
connections, and it is possible to make the characteristics as desired by connecting in various
combinations as necessary. As described above, according to the present invention, two bobbins
of voice coils are provided on one bobbin, and a signal is applied to the first voice coil and a
current having frequency characteristics flows to the second voice coil. (The second voice coil
EndPage: 2 is connected to the circuit element and the reactance element is connected in series
to the second voice coil, and it is connected in parallel to the voice coil of Fang 1 Desired
frequency characteristics can be obtained by variously selecting the connection). Therefore, it is
possible to expand the selection of the speaker cabinet, and the combination with other speakers
makes it easy to take crossover when performing 2-way or 3-way reproduction. In addition,
distortion in the vicinity of and below can be significantly reduced, and transient characteristics,
particularly falling characteristics, can also be improved.
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Furthermore, since the admittance characteristic can be made flat, it is possible to reduce the
load fluctuation with respect to the amplifier and perform constant voltage driving.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified illustration of an embodiment of
the present invention showing various connections and characteristics thereof. No. 1 1 1 1 1
voice coil, 2110 2nd voice coil. (7) Agent address other than the above Z 8-12 15 Ginza, Chuo-ku,
Tokyo [, 'f':,:, 'x-J Yu JEndPage: 3
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