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JPS5620398

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DESCRIPTION JPS5620398
Specification 1, Title of the Invention Electronically controlled tone arm record Detection of tone
arm vibration from output of cartridge for reproduction, connecting the cartridge output car to
an AC amplifier and driving the output of the AC amplifier for the tone arm A player device
connected to a driver and controlling the tone arm with the driver, comprising a switching device
according to the type of the cartridge by the switching device. An electronic control tone arm
characterized in that the gain of the AC amplifier is controlled and the loop gain is changed.
2, the scope of claims
3. Detailed Description of the Invention The present invention is applicable to various cartridges
and low frequency. It relates to the tone arm of a record player with little resonance. FIG. 1
shows a conventional low-resonance low tone arm system. In FIG. 1, 1 is a tone arm, 2 is a low
pass resonance detector, 3 is a low pass filter, 4 is an AC amplifier, 5 is a tone arm driver, 6 is a
counterweight, 7 is a tone arm bearing, 8 is a record board, 9 is a permanent magnet, 10 is an
electromagnet, 11 is a cartridge shell, 12 is a cartridge, and 13 is a cartridge output terminal.
The circuit of FIG. 1 is intended to suppress tone arm low-pass resonance (5 to 10 H 2) caused by
the equivalent mass seen from the cartridge and the compliance of the cartridge, and its
operation is accompanied by the rotation of the record 8 Low frequency resonant frequency The
detected output is amplified by the AC amplifier 4 through the low pass filter 3 and the
electromagnet 10 is driven by the output of the AC amplifier 4 to generate the attraction 2
repulsion between the permanent magnet 9 and the tone. The arm 1 is braked to suppress low
frequency resonance. 1−。 Here, the low pass filter 3 functions to cut off unnecessary
frequency components for control above the low band resonance frequency, but in a feedback
system that only flattens the cartridge response characteristics, feedback is performed in the
frequency range above the low band resonance frequency. Since there is no gain, EndPage: 1 has
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no effect and is not essential. In addition, although the electromagnet 10 is disposed to brake the
tone arm 1 in the vertical direction, it is actually possible to suppress the low band resonance
even if it is disposed at any position in the entire circumferential direction with respect to the
tone arm 1 It is possible. FIG. 2 compares the measurement results of low-pass resonance
characteristics in the tone arm system having no feedback system in FIG. 1 and the conventional
circuit. This figure shows the cartridge response 1 when the low frequency resonance
measurement record on which the 4-100 Hz sweep signal is recorded is reproduced, and the
pons characteristic, and (■) has a conventional feedback system. The low-pass resonance
characteristic 1 ml in the tone arm system is the low-pass resonance characteristic in the circuit
of FIG. As apparent from this figure, in the conventional system of (1), the tone arm resonates at
6 Hz and the amplitude is. In the circuit shown in FIG. 1 (1), which has a peak value of about 15
dB for the maximum, the tone arm is braked by the negative feedback, so low frequency
resonance does not occur, and the cartridge response characteristics can be almost flattened.
Low frequency resonance when playing back an actual music record is caused by excitation due
to eccentricity or warping of the record, but the low frequency resonant frequency itself is out of
the audible band, and although it can not be detected by hearing, it is in the audible band The
cross modulation of the channel detracts from the sound quality, and further, the deterioration of
crosstalk between channels detracts from the sense of stereo.
The circuit shown in FIG. 1 does not have the above-mentioned deterioration of the sound quality
because there is no occurrence of low frequency resonance, and although it can be said that it is
a very excellent system, it has one drawback. When the cartridge system is replaced, the force 1)sensitivity of the tori (power output) difference due to low range. It means that the resonance can
not be suppressed sufficiently. For example, considering the case of KM cartridge and MC
cartridge, in general, the sensitivity of MC cartridge is about -20 dB (1/10) and 5 for KM
cartridge, and the design of feedback system in Fig. 1 circuit is matched to MM cartridge In this
case, although low frequency resonance can be suppressed in the MM cartridge, low frequency
resonance can not be suppressed when the cartridge is replaced with the MC cartridge. 1.1 An
object of the present invention is a tonner for an audio player which can suppress low frequency
resonance in any cartridge without the above-mentioned disadvantages of the prior art. System
to provide In the circuit of FIG. 1, the degree of suppression of one low-pass resonance changes
when the car IJ flange is replaced, because the gain of the feedback system changes due to the
sensitivity (generated power output) difference of the cart 1]. Therefore, in order to solve this
problem, the gain of the feedback system may be increased or decreased according to the
sensitivity of the car 1-IJ dog and the size of the dog, and the 11-loop loop gain may be kept
constant. Specifically, the transmission gain of the AC amplifier 4 or the X69 stone 10 may be
changed in the circuit of FIG. The present invention will now be described by way of specific
examples. FIG. 3 shows a block diagram of the electronic control tone arm of the present
invention. In FIG. 3, reference numeral 14 denotes a gain switching device of the driver 5, and
the same reference numerals as in FIG. 1 denote the same components. The operation of the
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circuit shown in FIG. 6 depends on the sensitivity of the cartridge attached to the tone arm 1 to
control the gain of the driver 5 by the gain switching device 14 and suppress the low band
resonance equally to any cartridge. It is said that. A specific embodiment based on the block
diagram of FIG. 3 is shown in FIG. In this embodiment, a rotor lease switch is used for the gain
switching device 14, the contact point of the electromagnet 10 having multiple contacts is
switched by the rotary switch, and thereby the gain of the driver 5 is controlled. The details are
omitted because they are similar to FIG. For example, the contact point of the rotary switch 14 is
set to 1 for highly sensitive KMMC-tredge 11. If the gain of the driver 5 is low and the contact is
connected to 4 for low sensitivity MC cartridges and the gain of the driver 5 is increased to
operate, the low frequency range equivalent to both cartridges A pressure suppression effect of
resonance can be obtained.
FIG. 5 shows another block diagram of the tone arm according to the present invention. In FIG. 5,
reference numeral 15 denotes a gain switching device of the AC amplifier 4, and the same
reference numerals as in FIGS. 1, 3 and 4 denote the same components. The operation of the
circuit in FIG. 5 is to control the gain of the AC amplifier 4 by the switching device 15 according
to the sensitivity of the cartridge attached to the tone arm 1, and in principle the embodiment of
FIG. Is the same as One specific embodiment based on the block diagram of FIG. 5 is shown in
FIG. In FIG. 6, a 16.degree. C. 18.19.20 is a resistor, and 21 is a rotary switch 8. The same
reference numerals as in FIG. 1, FIG. 3, FIG. 4, and FIG. In this embodiment, the voltage gain of
the AC amplifier 4 which is a differential amplifier is controlled by controlling the rotary 1
(switching of the 1-switch 21). For example, assuming that the values of the resistors 17 to 20
are R1) to Rho, respectively, R1q <Rls <Rto (7? If the rotary switch 21 is connected to the contact
point 4, the voltage gain of the AC amplifier 4 can be increased, and a large voltage output can be
obtained, so that a large braking force can be obtained for the driver 5. Can do. In addition, when
the contact of the rotary switch 21 is connected to 1, the braking force obtained by the driver 5
becomes smaller in the reverse of the above. Therefore, as in FIG. 4, for high sensitivity KM
cartridges, the contact point of the rotary switch 21 is connected to 1 to lower the voltage gain of
the AC amplifier 4 to reduce the braking force of the driver 5 and to lower the sensitivity. For MC
cartridge, connect the contact of rotary switch 21 to 4 and increase the voltage gain of AC
amplifier · · · 4 to increase the braking force of driver 5. Both cars) low-frequency band at IJ
flange The suppression effect of resonance can be obtained. . The embodiments of FIGS. 4 to 6
have been described above. . The measurement results are shown in FIG. FIG. 7 (α) shows a
conventional tone arm system without a feedback system. It is a low-pass resonance
characteristic, and the characteristic (11 is a high sensitivity MM). The cartridge, the one with the
characteristic (the MC 'cartridge with low sensitivity to Il + 1, and the characteristic (1) is the
middle between the characteristics 1111 and 111D, but in each case approximately 15 d at
about 6 Hz, Lower band resonance B of B. It has the same value. (Phrase diagram is the low-pass
resonance characteristic according to the embodiment of FIG. 4, FIG. 6. The characteristics (1 to
01) respectively correspond to the characteristics (1) to 1 it in the (α) diagram 7.
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However, by switching the gain of the feedback system according to the sensitivity of the
cartridge, the low frequency resonance can be suppressed equally in any of the car 1-IJ flanges,
and the characteristics can be flattened. There is. As is apparent from FIG. 7, according to the
sensitivity of the cartridge, the transmission gain of the feedback system is controlled in
accordance with the degree (generated output), and the mechanical negative feedback (AC
switch) is applied to the tone arm. Then, it is possible to equally suppress the low band resonance
for any cartridge. ]. This is to solve the problem that the sensitivity of the cartridge causes a
difference in the suppression effect of the low band resonance in the conventional system, and it
can be said that this is a system promoted to practical use as the degree of freedom in system
design increases. ,
4. Brief description of the drawings. FIG. 1 shows a conventional tone arm systematerized circuit,
FIG. 1 and FIG. 2 are physical property diagrams showing the low-pass resonance characteristics
of the circuit of FIG. 1, and FIG. 4 is a circuit diagram showing a specific embodiment of FIG. 3,
FIG. 5 is a block diagram showing another embodiment of the electronic control tone arm of the
present invention, FIG. 6 is a circuit diagram showing a specific embodiment of FIG. 5, and FIG. 7
is a characteristic diagram showing the effect of the present invention. 1: Tonearm, 2: Vibration
detector, 5: Low pass filter, 4: Amplifier. EndPage: 31-1 Raw + 2 Mouth 3 Figure 4 ffi 4 End Page:
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