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JPS55133140

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DESCRIPTION JPS55133140
Description t name of the invention
Low capacity signal path
3. Detailed Description of the Invention The present invention relates to a low capacity signal
path adapted to prevent characteristic deterioration of a signal to be transmitted. In general,
when transmitting a signal from a signal source to another electrical device through a signal path
such as a cord, particularly a long signal path, the output impedance of the signal source is
limited, so that the signal can be the signal. There is Jl [while the noise such as induction ham is
mixed in the passage. Conventionally, for the purpose of solving the above-mentioned problems,
the signal path is constructed using a shield machine as shown in FIG. 1. That is, the shield wire
1a shown in FIG. , Sheath 111 made of an insulating material such as synthetic resin on core wire
2 composed of 111111 and the like, and a wire material of copper Me is mesh-like I / c 4 i! The
shield jacket 4 is covered, and the shield jacket 5 is further covered with a jacket 5 made of the
same material as the jacket 3. And this shield @ 1 is just like F! As shown at $ 21i4, the core 412
and the shield jacket 4 are connected to the output terminals Qa and Qb of the signal source 6 at
one end to form a signal path between the signal source 6 and the amplifier 7 On the other end
side, the core ij 2 is connected to the input terminal 7 a of the amplifier 7 and the shield jacket 4
is connected to the grounded output terminal 7 b. By the way, signal system #I formed by the
above-mentioned shield @ 1! ! The high frequency equivalent circuit can be expressed as shown
in FIG. 3, and between the output terminal 6a, db and the input terminal 7 &, 7N1 and EndPage:
1, the core 1 Is2 and the shield jacket 4 There are inductances L1sLi, ..., I + 2, Ll, ... respectively,
and these cores? There is a capacitance component (floating capacitance) 01.01 s... Between IM 2
and shield jacket 4. Therefore, in the above signal path, deterioration is caused by the
particularly high frequency region of the signal to be transmitted or by the inductance
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components I11, L1..., L1, L1. There is a drawback that the signal can not be transmitted
faithfully over all frequencies. (In this case, the voltage 'i'01 obtained at the input terminal' it, 'lb
produces a delay with respect to the voltage vi3 of the signal source 6. In this case, although the
deterioration of the signal can be improved by shortening the length of the shield fIIJ1, usually
various restrictions may make this impossible. That is, it is often used when connecting a signal
system such as the above-mentioned shield 411, for example, in an audio reproduction system,
between a signal source such as a tuner, a player, and a tape recorder, and a bridge main
amplifier. The wire 1 usually requires one degree of authority, and if it is shortened, problems
occur in that the arrangement of the device is disturbed. In this case, the shield, witu, usually
1OOPP / ? between the core wire 2 and the shield jacket 4 Since it has a certain degree of
capacitance, it will surely degrade the signal component of the signal.
(By the impedance of the signal source, the high-pass characteristic is affected by the capacitance
of a, & 10 pF. Under the above circumstances, the present invention provides a low capacity
signal system path for preventing deterioration of signal quality due to stray capacitance in a
signal system path using a shield wire, and comprises the signal system path. Using a shield wire
having a first and a second shield jacket on the outside of the core wire and transmitting the
signal of the signal source to the other electric circuit through the core wire and the second
shield jacket, And the second shield jacket, and the potential of the first shield jacket is always
made equal to the potential of the core wire. Hereinafter, an embodiment of the present invention
will be described with reference to FIGS. 4 to 8. FIG. 4 is a view showing an example of a shield
line used for a low capacitance signal path according to the present invention, and as shown in
this figure, the shield line 11 is synthesized with a core 12 made of copper #j etc. * Mf1 etc. The
first shield cover 14 is formed by covering a first shield cover 14 formed by meshing a copper
plate or the like on the outer cover 13, and the first shield cover 14 is similar to the outer cover
13. A covering 15 made of a material is placed on this covering 15 and a second shield covering
16 similar to the first shielding covering 14 is placed, and the second shielding covering 10 is
further provided with a covering 18.15 and It is covered with an envelope 17 made of the same
material. Under such a structure, the shield 4111 is such that the core wire 12 can be doubly
shielded by the first and second shield envelopes 14.16 that cover the same. Thus, the low
capacitance signal path according to the present invention is constructed as shown in FIG. That
is, FIG. 5 shows a first embodiment in which the present invention is applied to a signal line for
supplying all the preamplifiers of an output signal of a pickup cartridge in a player, and the
reference numeral 20ri in FIG. 21 shows a pickup cartridge, and 21 shows a preamplifier. As
shown in this figure, the pickup cartridge 20d and its output terminal 201L are connected to the
shield, one end side of the core wire 12 in the mii, and the output terminal 201) is connected to
one end @ of the second shield jacket 16 in the same shield [311 It is connected. At the other end
of the shield @ 11, the core wire 12 is connected to the input terminal 21m of the preamplifier
21, the second shield jacket 16 is connected to the grounded input terminal 21b, and the first
shield jacket 14 is It is connected to the terminal 21e.
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Under such a connection state, the shield m11 constitutes a signal path that supplies the output
signal of the pickup cartridge 20 to the preamplifier 21 through the core wire 12 and the second
shield jacket 16. The 1g system WII is constructed such that the potential of the first shield
sheath 14 is always equal to the potential of the core 12 by a circuit incorporated in the
preamplifier 21. The pre-EndPage: 2 amplifier 21 has an operational amplifier 22 for amplifying
the output signal of the pickup cartridge 20 and an operation term Illi device 23 for equalizing
the potential of the first shield jacket 14 to the potential of the core 4112. It is. That is, in the
preamplifier 21, the non-inverted input terminal 22a of the operational term width unit 22 is
connected to the input terminal 21 & and is grounded via the resistor 24 and the capacitor 26,
and the inverted input terminal 22t + is grounded via the resistor 2. An output terminal 22o is
connected to the output terminal 21a and to the inverting input end 22b via a resistor 27.28 and
a capacitor 29.30. In this case resistance 24.2 '? , 28 and a capacitor 25.29.80 serve as an
equalizer element for providing an R-k-AA ir lyza carp to the transfer characteristic of the noninversion amplifying circuit (the operational amplifier 22). The arithmetic term m unit 23 is
configured as a so-called voltage 7 OROR, the non-inverted input end 23 & is connected to the
inverted input end 22bK, the inverted input end 23b is connected to the output end 230, and the
output end 23a is a terminal It is connected to 21 o. Also, the output terminal 21 is grounded.
With the above configuration, the output signal of the pickup cartridge 20 is input from the
output terminals 20 &, 20b to the input terminal 21a 121b of the preamplifier 21 through the
core wire 12 of the shield 1f IJ11 and the second shield jacket 10, and the preamplifier 2i After
being amplified by the operational amplifier 22 at the output terminal 21a. 21 ? taken out from.
At this time, the first shield sheath 14 of the shield wire 11 is brought to a potential equal to the
potential of the core 12 by the output of the operational amplifier 23. That is, in the preamp 11,
the operational amplifier 22 has a gain Al of man! When> 1, the potentials at the inverting input
end 22m and the non-inverting input end 22b are equal regardless of the presence or absence of
the input signal. Further, since the input impedance of the operation term Qin 23 configured as a
voltage follower is extremely high, the current between the input end 23 & and the output end Q
3 a is @ *.
Therefore, the potential of the inverting input end 22b is applied to the non-inverting input end
231, and the potential of the non-inverting input end 22 &, that is, the potential of the core wire
12 is output to the output end 23o thereof. The potential of the first shield envelope 14 is made
equal to the potential of the core # 12. The signal path consisting of the shield $ 11 in this case
can represent the equivalent circuit as shown in FIG. That is, as shown in this figure, the shield
wire 11 has an inductance component -1- ..., L4, L4 ... L6, respectively, for the core N12 and the
eleventh second shield jacket 14.16. L, ..., and between the core wire 12 and the first shield
jacket 14 and between the first and second shield jackets 14.16, respectively, for capacitance
(float a'aMi) Ot-, Or ", '% 0 r = ft, and that t,' r xi 12 and the first shield envelope 14 are shorted
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together, or they are always at the same potential. (However, this means that the potentials are
equal, and the movement of charge is impossible and it can be said that they are independent of
current. As is clear from this equivalent circuit, as a result of the shield 1 s 11 being always
equipotential between the 8 plum 12 and the first shield jacket 14, the capacitance component
'2% a ииииииииии It becomes upper zero. The reason is that even if the capacitance is zero, it can be said
that there is no movement of t ? and no delay element if no voltage is applied. Therefore, the
output signal of the pickup cartridge 20 is transmitted to the input terminal 214121 without the
frequency characteristic of the high region being deteriorated due to the capacitance 0 ?,.
Further, in this case, the voltage vo ? obtained between the input terminals 211 121 b does not
substantially cause the output voltage v1 ? of the pickup cartridge 20. At this time, the shield is
doubly shielded by the core wire 12 butterfly transmitting the same output signal and the first
and second shield envelopes 14.16. In this case, the first shield jacket 14 has a shielding effect
on the core 1 j 12 because the output impedance of the operational amplifier 23 is sufficiently
low, and the operational amplifier 23 functions as a buffer amplifier to invert the operational
amplifier 22. Don't pick up noise from input end 22b-. Since the second shield sheath 16 also has
the same shield effect as that of the core wire 12 as in the prior art, the output signal has a level
greater than that of the conventional shield U in EndPage: 311 8 / N Are transmitted to the input
terminals 21 &, 21b without deterioration of the
As described above, the signal path formed as described above using the shield m11 can ignore
the floating condition of the shield 1se 111 and can obtain a sufficient shielding effect. The
parallel circuit of the resistor 24 and the capacitor 25 interposed between the input end 22 of
the operational amplifier 22 in FIG. 5 and the ground is the pickup cartridge 20 ', that is, the
output end 20a of the preceding stage of the shield wire 11, It may be provided between 20b.
FIGS. 7 and 8 respectively show the second and third embodiments of the signal path according
to the present invention (the application object is the same as the first embodiment described
above). The same reference numerals as in FIG. 5 denote the same parts in FIG. In these
embodiments, the displacement is also made different from that of FIG. That is, in the
embodiment shown in the seventh pi J, the circuit for amplifying the output signal of the pickup
cartridge 20 in the preamplifier 21 is constituted by the operational amplifier 22 (11), the RIAA
equalizer element 40 and the resistor 26 and the inverting input end 22 b of the operational
amplifier 22 Are connected via a resistor 41 to a terminal 21oK. Also in this embodiment, the
electric potential of the inverting input end 22b, that is, the electric potential of the core wire 12
can be applied to the first shield envelope 14 through the resistor 41, and the same operation
and effect as the first embodiment are obtained. can get. In the embodiment shown in FIG. 8, the
output signal of the pickup cartridge 20 is amplified by the amplifier 42 in the preamplifier 21
and the potential of the input end 42 & of the amplifier 42, ie, the core 1! In the case of a book in
which the potential of 12 is applied to the first shield envelope 14 by the operational amplifier
43 configured as a latch follower, the same operation and effect as in the first embodiment can
be obtained also in this configuration. O Next, with regard to the signal path for supplying the
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output signal of the pickup cartridge to the amplifier, the measurement results of the electrical
characteristics in the case where the Oka signal path has a conventional configuration and the
configuration according to the present invention will be described (? ). FIG. 9 is a circuit
diagram used for the above measurement, in which the output terminal 20 & of the pickup
cartridge 20 is connected to one end of the core wire 12 of the shield 11 described above, and
the output terminal 20b is the same It is connected to one end side of the second shield envelope
16 of 11il 111 via an emitter 44. At the other end of the shield m1llet, the core 4112 is the
noninverting input 45aK of operational amplification @ 45! The first shield jacket 14 is
connected via the switch 46 to the output 450 of the operational amplifier 45, and the second
shield jacket is connected to the output terminal 46).
The operational amplifier 45 is configured as a voltage 7 OROR, and its non-inverting input
terminal 5 & is connected to the output terminal 46b via the resistor 47, and the inverting input
terminal 4.51 is connected to the output terminal 45oK. Are connected to the output terminal
41) Kat. Under this kind of circuit thin acid, the first shield cover 14rli of the shield @ 11 and the
switch 46 are opened and floated from the circuit, and when the switch 6 is closed, the
operational amplifier The (13) potential of the 45 output end 45G, that is, the potential of the
core m12 is given. Therefore, the signal line by the shield 1111 constitutes a conventional signal
line when the switch 46 is opened, and constitutes the signal line according to the present
invention when the switch 46 is closed. Then, in the above measurement circuit, a rectangular
wave of 1 KIlz is generated by the oscillator 44, and this rectangular wave is taken out from the
output terminals 46m and 46b, and the waveform is li! By an oscilloscope (not shown). I guess.
As a result, the waveform obtained by the oscilloscope is 10th &! When the shield wire 11 is
configured in the conventional signal path. ! The waveform shown in 3 (a) is obtained, and the
waveform shown in FIG. 1O (1+) is obtained when the same shield IJJ11 is formed in the signal
path according to the present invention. As apparent from FIG. 10 (&) and (b), when the shield
line 11 is a conventional signal path, the waveform is disturbed (the inductance of the shield 41 j
11 and the resonance of the frequency relative to the capacitance) However, when this was used
as the signal path according to the present invention, the waveform was free from such
disturbances as described above, and a substantially perfect square wave could be obtained. (14)
EndPage: 4 The object of application of the present invention is not limited to the signal path
between the pickup cartridge and the preamplifier as in the above-described embodiment, and a
signal thread formed by using a shield machine. Is applicable to all of (The signal path of this
connection may not be sand for connecting two devices, but may be internal wiring of one device.
As is apparent from the above description, according to the present invention, in the signal path
using a shield wire, the shield wire has a first and second shield jacket outside the core wire.
Signal source 0 signal is transmitted to the other electrical circuit through the core wire and the
second shield jacket, while the first shield jacket is positioned between the core wire and the
second shield jacket. Since the potential is always made equal to the potential of the core wire,
the stray capacitance of the shield wire can be equalized to zero, preventing deterioration of the
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ringing number characteristics of the signal (the deterioration of the high frequency
characteristics). In addition, it is possible to shield the core wire in this shield wire into two by
the first and second shield outer plates, and it is possible to obtain an effect of improving the (?)
87N characteristic of the signal.
Therefore, according to the low capacity signal path according to the present invention, when
connecting devices using a shield machine, the length of the shield weir can be freely set while
the input circuit (input impedance, braking capacitor) can be set freely Values) can be designed
without considering the stray capacitance of the shield wire, and the characteristics as designed
can be obtained for the device regardless of the length of the shield wire, for example, the
number of audio devices It is suitable to use for the signal line etc. which connect between.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a shield machine
used in a conventional signal path, and FIG. 2 is 1 gI of a conventional signal thread path
constructed using the shield line shown in FIG. The third diagram shows the equivalent circuit of
the signal path shown in FIG. 2. The figure is a perspective view showing an example of the
shield machine used for the signal path according to the present invention. FIG. FIG. 6 is a circuit
diagram showing a first embodiment in which the invention is applied to a signal path for
supplying an output signal of a pickup cartridge of a player to a preamplifier, and FIG. 6 (16) is a
signal path according to the invention shown in FIG. FIG. 7 shows a second embodiment of a
signal path according to the present invention. FIG. 8 is a circuit diagram showing the essential
elements of the second embodiment, and FIG. 9 is a circuit diagram showing a measuring circuit
for comparing the characteristics of the conventional signal path and the signal path according to
the present invention. 10 (&) and 10 (b) show waveforms obtained from the measurement circuit
of FIG. 9, and FIG. 10 (a) shows waveforms obtained from conventional signal paths. Fig. 10 (b) is
a diagram showing a waveform obtained from the crevice according to the present invention. 11
----- shield machine, 12 ..... core wire 14 ..... first shield sheath, the second shield jacket 16 ..., 20
..... signal sources (pickup cartridge), 21 ..... 'electrical circuit (preamplifier), always equal to the
island 1-position of the 22.23.4.3 ..... 8 yoke 12 and the second shield jacket 16 Means
(operational amplifier), 41... Means (resistance) for constantly overwhelming the potentials of the
core wire 12 and the second shield sheath 10. ? 11 applicants Japanese musical instrument
manufacturing cup type company Figure 1 Figure 2 Figure 3 EndPage: ?
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