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# DESCRIPTION JPS50120406

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DESCRIPTION JPS50120406
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the transmission
system of an electromagnetic pickup and an electrokinetic pickup used for reproducing a disc
record, and to an improvement of an electric load circuit. (Sword in general l! The electrical
equivalent circuit of the transmission system in which the load impedance is connected to the
pick-up is called IMIWI. In Edo 1 @, Eo is an open output voltage generated at the pickup coil @, r
is a DC resistance of the pickup coil, L is an inductance of the pickup coil, C1 ha, a stray capacity
of the pickup coil, C8 is the stray capacitance of the lead in the pickup arm, Cs is the stray
capacitance of the pickup output cord, C4 is the input capacitance of the preamplifier connected
to the pickup, and the moat is the load resistance of the pickup, which is the preamplifier
connected to the pickup Equal to the input resistance of Also, Bo is the terminal voltage of the
load resistor, which is actually the output voltage of O-bit up. As can be seen from the O
equivalent path, the transmission system company pickup of the electromagnetic slide pickup,
the sum of inductance L of the coil and the stray capacitance of each part and k form an
electrical resonant circuit, so that the resonant local wave徽 f0; About the meeting where the IL
resistance r is small, f =-· · · · · · (0 0 w w (C, + C, + Cs + C 4 ° (2)), the sharpness Q of the e # tiiii
path is given by the φ equation for the case of r <moat. Hori Q = □ (2) 2πfo L Therefore, as
shown by @ 2 WI J dh * a, even if the frequency characteristic of the output voltage of the pickup
itself, that is, the open output voltage E 0 is flat, the actual pickup O output The voltage, that is,
the terminal voltage B0 of the load resistance moat, is a resonant layer 1111f. In this case, if the
value of the moat is large, it indicates a resonance line, and if it is 10 or more, it will drop
sharply, and the frequency characteristic of Bo will not be flat. Since the frequency response of
the transmission system of the pickup is required to be flat over the necessary reproduction
frequency band, for this purpose, the inductance L of the pickup company of the prior art Koino5 is made as small as possible (or By making the stray capacitance of each part as small as
possible k and increasing the value of 1 ° on the resonance circumference side, it is possible to
widen the frequency band of the transmission system from k, and to make the moat unequal in
popularity In order to reduce the frequency characteristics by f h 91 91, 91 4.36.2 6.2, reduce
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the inductance L of the pickup coil J), it is necessary to reduce the number of turns of the coil.
Also, the output voltage level is lowered along with this, but since the output voltage level is
required more than llr from the demand of 8NJt etc, even if the coil e spring t is reduced K There
is a limit, It; yl O can not be reduced to the inductance LFi necessary and sufficient value.
Also, among the stray capacitances of the respective parts, the values of C, C8 and C4 do not
become a problem at x-soW or less, but the stray capacitance C of the pickup output code is C,
#[email protected] K2-JOOW or so. If this C3 is small, the effect of increasing the resonance # 11 to the target
11f0 is large, and therefore the length of the pickup output cord is shorted by IIc # i, or a thick
cord using many insulators, Alternatively, there is a method such as making a coarse cord of
shield net, etc., but it causes a defect such as deterioration in handling or 1j8N ratio O, so that
stray capacitance C, 0 value of pickup output code is up to necessary and sufficient value K It can
not be made smaller. For example, if the value of the erosion resistance is increased, the
frequency band is broadened, but on the other hand (the value of the KQe is increased as shown
by the equation (2))-the level of the resonance peak is increased and the frequency Become sex,
high IIt II! It is not preferable to make the value of-so long as it causes distortion and
miscellaneous resources, and causes deterioration of phase characteristics. On the contrary, if the
value of the load resistance is small, no beak occurs in the frequency fine characteristics, but the
high frequency response is lowered and the frequency fine band is narrowed. In general, if the
value of load resistance is chosen to be Q = J in equation (2), it means that moat than k! The colifting wave [rf] from k changing to 2πfoL. The load resistance is generally incorporated into the
input terminal of the Prian 7 which is generally connected to the pickup, and its value is fixed at
about 50 Km. It is almost impossible to randomly connect to nine optimum values, which is
suitable for pickups such that Q = 1. In particular, in the reproduction of CD-4 stereo records, the
company, No. 4), and the above-mentioned 再生 O reproduction frequency band and a flat
frequency characteristic are required. It is impossible to satisfy The present invention is also an
improvement over the above-mentioned conventional drawbacks, and the object of the present
invention is to first of all, 1 ° No. 8 ° of the pick-up itself. □、。 □□□、。 □ There is K to
provide a pickup transmission system that can be extracted with straw. Inductance L of the
second K, pickup, -3 ir and the iMJil wave number f of the stray capacitance. However, in order to
provide a pickup transmission system sufficiently higher than the necessary reproduction
frequency band. Thirdly, in one necessary reproduction frequency band, it is intended to provide
a transmission system of a pickup having completely flat frequency characteristics.
In the reproduction of the JIIIiK% CD-4 system stereo record, the values of the stray capacitance
and load resistance of each part of pickup coil inductance L1 remain the same as before, that is,
the number of coil turns, pickup output cord and It is intended to provide a pickup transmission
system that satisfies the required performance while keeping the load resistance value in the
conventional manner. Invented the following threats and drawings and co-KIPIIIIKm! Light up.
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Shi Button? The third Wi is an equivalent circuit showing an example of carrying out the
electrical load circuit of the electromagnetic method pickup ′ ′ in the present invention. In this
case, in this case, the pickup coil #CIII! シてパッ−ファ・アンプＡが！ This buffer amplifier has
high input impedance, low output impedance and has voltage gain jointable, and switching
device that can switch phase characteristics by θ ° or 180 °. A solid-state electronic circuit
having a power supply P for driving the buffer amplifier, a @current power supply or a battery
separately installed, or a turn- It is configured to be shared with a power supply or a power
supply such as a preamplifier connected to the pickup. Resonant frequency IIf of the
transmission system of the pickup in this case. 'Is given in a rumor. f '= □ ... (j02 □ times in
general, as mentioned above, because C is sufficiently small, resonance frequency vtt5 is higher
than necessary and sufficient as long as it takes inductance Lltl-1 of the coil. Thus, it is possible
to obtain a transmission system having a completely flat frequency characteristic with a
necessary and sufficient frequency band. Figure 11 is an equivalent (R) path showing another
example of implementing the present invention 4Nj + in the electric load circuit of the electric
type I pick-up, and the buffer with the same configuration as that of the above The amplifier is
connected to the end of the lead in the pick-up arm, ie, it is prefixed to the pick-up output cord.
The resonance frequency et 6 ° of the transmission system of the pickup in this case is given by
equation (4). f6 ° = □ (4) As described above, C2 is sufficiently small as in the case of C in the
lower part of 2 · πkJ, so that the resonance frequency station ° is as long as L takes a general
value, Since the required value is high enough, it is possible to obtain a transmission system
having a necessary and sufficient frequency band and a flat frequency characteristic. Fig. 5 is an
equivalent circuit showing an example of the present invention in which an electric load circuit of
an electrodynamic type pickup, for example, an electrodynamic type pickup having a step-up
transformer built in a pickup cartridge case, is implemented. In the case of the stationary type
pickup, the inductance and stray capacitance of the pickup, the coil and the primary winding coil
of the boosting transformer are omitted because they are smaller by a negligible amount K1 as
compared with the inductance C8k of the secondary coil of the boosting transformer.
In this case, it is connected to the secondary side pile of 1 (2) -1,1 square kA '' / 77.171 square 84,7 as described above, and the resonance frequency of the transmission system of the pickup in
this case f6 ° 1 is given by (蜀. II- □... (generally to group 2π 搗, co is sufficiently small, and Lo

frequency @ 1 ;, °° is a value higher than necessary and sufficient, and the transmission having
the necessary and sufficient frequency band and completely flat frequency characteristic A
system is obtained. Figure 11 is an equivalent circuit showing another example in which the
present invention was applied to the electric load circuit of an electrodynamic type pickup, and in
the case of this two-character, the buffer amplifier A having the same configuration as the above
is a pickup arm The inner lead end mKJI follows, ie it is prefixed to the pick-up output code. The
resonance frequency t5 + ++ of the transmission system of the pickup in this case is given by the
equation (a). f6 °°° = □ ... (a2π5 焉 61 焉 J In this case as well as in Example 2 shown in FIG.
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514, the resonance frequency * t5 °° is a necessary and sufficiently high ratio, so it is
necessary. A transmission system having a sufficient frequency band and a flat frequency
characteristic is obtained. Inventive # II # is connected to the pickup coil or 2nd coil to the
secondary coil of the step-up transformer, or '-to the end of the lead in the pickup arm, as
described above. By providing a buffer amplifier in front of the pickup output cord for preamp
connection having a large floating capacitance, thereby significantly improving the invention of
the transmission system of the pickup, The following effects can be obtained by this book 111 =
6: First of all, by setting the buffer amplifier in an appropriate manner as described above, the
resonance frequency of the transmission system of the pickup can be sufficiently high, so that
the necessary and sufficient frequency band and the common frequency characteristics can be
obtained. The pickup's transmission system is obtained, so that the characteristic of the pickup
itself's output voltage (open output voltage) 2 with the actual pickup's output voltage (load
resistance terminal voltage) is completely inferior to the second. 2.) It is possible to faithfully
transmit the basic voltage output of the fundamental to the preamplifier. Second, generation of
harmonic distortion as signal transmission KWIM, deterioration of 8N ratio due to conductive
noise, deterioration of phase characteristics, deterioration of channel separation characteristics,
deterioration of transient characteristics, etc. can be well prevented. Third, special K, CD-4
system In reproduction of stereo records, the number of electric lines in the transmission system,
that is, the inductance L1 of the pickup coil or the inductance L of the secondary coil of the stepup transformer.
The stray capacitance C, CBs C3 and C4 and corrosion resistance of each part may be the same
as the electrical constant 2 of the pickup for 02 channel stereo in the prior art, that is, the
number of coil turns and pickup output cord etc need not be changed. The parts of one
conventional 2-channel pickup can be used as it is without lowering the voltage and
accompanying deterioration of the 8N ratio, the value of the load resistance can be appropriate,
there is no restriction on handling, and the cost increases. It can be well prevented. 11FiK, the
output voltage level decreases as the performance of the vibration system of the general KCD-4
system stereo record (11) playback is improved or improved. In this case, the number of turns of
the coil is increased to compensate for this. Although the inductance is increased, the resonance
frequency of the four transmission systems can be kept high in such a case, so that the
transmission system can have a necessary and sufficient frequency band and a flat frequency of
11 characteristics. Fifth, by providing a phase switching circuit in the buffer amplifier k), it is
possible to easily adjust the polarity of the pickup output voltage which is a problem in CD-4
system stereo record reproduction. Sixth, since the voltage gain of the 1 buffer amplifier can be
set to 1Ij, the output voltage level is set to stably operate the -4 demosector even when various
cartridges are attached to the pickup arm. It can be adjusted. Seventh, since one buffer amplifier
can move sufficiently by a small amount of current, there is no need to separately provide a
dedicated rectification power supply or a battery, and the servo control 1 circuit (12) of the
turntable combined with the pickup By sharing with a power source such as a pre-amplifier
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connected to the mw * blowing 紘 O pick-up, the cost increase can be well prevented.
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