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JPS5767226

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5767226
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a control system of a
record player to which a conventional moving coil type pickup cartridge is applied, and FIG. 2 is
an embodiment of a moving coil type pickup cartridge according to the present invention and
FIGS. 3A and 3B show a control system of a record player formed by applying this, and FIGS. 3A
and 3B are front and side views showing the relationship between the magnetic circuit of the
movable coil type pickup cartridge according to the present invention and the microphone 40
coil body. FIG. 4 is one of the materials exhibiting the magnetoresistance effect. FIG. 5 is a graph
showing the characteristics of the magnetic flux density and resistance change of NiCo, and FIG.
5 is a graph showing the relationship between the position of the NiCo coil with respect to the
magnetic field and the resistance change of the coil. 2 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
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и, the converter, 9. и Tone arm, 20 и и и и и и и и и и Moving coil type pickup cartridge, 22a,
22b и и и и и и и и и и и и и и и и и micro-coil body, 24 и и и и и и и и и и cantilever ............. Fig.2C Fig.3 Fig.11-и и 1 \,
3.4 huge 6L7) 3 Fig. 4 ?-? ? ?
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moving coil type
pickup cartridge, and in particular, a generating coil is formed of a magnetoresistive material
whose resistance changes in accordance with a change in magnetic flux density. By controlling
the tone arm using this resistance change as a coil position detection signal, it is an object of the
present invention to provide a movable coil holder pick-up (1) / ?-no / tube cartridge that
performs stable reproduction without distortion. I assume. In a record player incorporating a
moving coil type pickup cartridge, if there is warpage or the like on the record board, the 9
generator coils are unnecessarily biased from the optimum operating point, generating power at
that position, and distortion occurs in the reproduction signal become. Therefore, there is a
record player in which the tone arm is rotated according to the warpage of the record board to
correct one power generation coil to the optimum operating point and reproduce the distortion-
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free reproduction signal. FIG. 1 shows a record player incorporating a conventional moving coil
type pickup cartridge. When the movable coil type pickup cartridge 1 relatively scans the record
board 2, it picks up a signal according to the warp of the record board 2 together with the signal
in the sound groove. This pickup is a good signal. The signal is amplified by the preamplifier 3
and amplified by the first stage of the free-wheel amplifier 4, and the speaker 5 is produced. In
addition, a part of the signal amplified by the preamplifier 3 is added to the low pass filter 6, and
the low pass component (the component resulting from the record disc resistance) is taken out
and amplified by the control amplifier T (2) For example, it is added to the electro-mechanical
conversion unit 8 consisting of a magnetic circuit and a coil, the tone arm 9 rotates about the
support 10, the position of the pickup cartridge 1 with respect to the recording board 2 is
controlled uniformly, and one generator coil is It is controlled to the optimal operating point.
Here, the pickup cartridge 1 is a velocity amplitude proportional detection type, and the velocity
amplitude of the generating coil ? leaves small for extremely low frequencies such as the
warpage of the record board 2. For this reason, the output voltage corresponding to this low
frequency is small, the electro-mechanical converter 88 is insufficient for driving, and 1tThc of
the pickup car X-tridge 1 to the recording board 2 It becomes very difficult to control the
position constantly, that is, to control the generating coil to the optimum operating point. The
present invention has a configuration in which two power generation coils are formed of a
magnetoresistance effect material, and the deviation from the optimum operating point of the
power generation coil is detected as a change in resistance value, and the above defects are
eliminated. Examples will be described.
FIG. 2 shows a control system of a record player to which an embodiment of the movable coil
type pickup (3) cartridge according to the present invention is applied. In the same section, the
same components as those shown in FIG. The moving coil type pickup cartridge 20 is. The micro
coil body 23 of the printed coil type, in which the coils 22a and 22b are printed on the film
substrate 21, is fixed in the vicinity of the reproduction needle 25 in the cantilever 24 and this
micro coil body 23 is a pair of yokes 26.27. And the permanent magnet piece 28 and enters into
the magnetic field 30 of the magnetic circuit 29. At the time of record reproduction, the micro
coil body 23 moves into and out of the magnetic field 30 according to the movement of the
reproducing needle 25, and at this time the coils 22a and 22b move in a direction orthogonal to
the magnetic flux 31 indicated by the arrows to generate power. . Moreover, the micro coil body
23 is each coil 22a. The point at which approximately half of 22b is in the magnetic field
operates as the optimum operating point. Here, the coils 22a and 22b are formed of a material
exhibiting a magnetoresistance effect. Materials that exhibit the magnetoresistance effect include
semiconductor films with high carrier (4) mobility such as In8b or InAe + ferromagnetic metal
films such as Co + Fe + NlCo, etc. 9 In order to function as a power generation coil, the electric
impedance is The latter, a ferromagnetic metal film, is suitable given that it is required to be low.
As one example of the ferromagnetic metal film, FIG. 41 shows a change in resistance with
respect to a change in magnetic flux density of NlCa'li. Here, in the horizontal axis indicating the
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magnetic flux density (-) indicates that the direction of the magnetic flux is reverse. Further, Ro
represents the resistance value of '/) NICogI outside the magnetic field, and ?R represents the
amount of change in the resistance value in the magnetic field (+ indicates the boost port,indicates the decrease). When it is parallel to the surface direction of the NlCo film, that is, the
first direction flowing through it and the direction force S of the magnetic flux, it becomes as
shown by the graph line II shown by a dashed dotted line in the figure, and the resistance of the
NlCo film increases the magnetic flux density Increase with When the direction of the underflow
flowing through NIC0 @ is orthogonal to the direction of the magnetic flux, that is, NiCo; when
arranged orthogonal to the magnetic flux, as shown by the solid line in the figure, as indicated by
a solid line j) NiCo The resistance of the film decreases with the increase of the magnetic flux
density. Furthermore, by adding various additives to N Tochi o, or changing the film thickness to
give 9 (5) or anisotropy, etc., the above graph line 1.1 is more aimed It can be changed to
something suitable for Here, the relationship between the coils 22a and 22b and the magnetic
flux 31 corresponds to the case where the direction of the magnetic flux is perpendicular to the
surface direction of the coil, that is, the direction of the current, and when the coil enters the
magnetic field The magnetic flux crosses the newly entered part, and the resistance drops in this
part as shown by the graph line Tanaka of the fourth quadrant in FIG.
Therefore, the resistance of the entire coil, including the part already in the magnetic field and
the part still outside the magnetic field, is also changed to decrease. On the contrary, when the
coil is displaced in the direction of withdrawal from the magnetic field, the resistance value in the
part of the coil which has come out of the magnetic field increases, and the resistance of the
entire coil changes in the increasing direction. Therefore, the relationship between the positions
of the coils 22a and 22b and the change in resistance of the coil is as shown by the graph line ?
in FIG. 5, and the magnetic field 30 is centered on the optimum operating point (indicated by the
origin 0). When you move inward (6), the resistance of the coil decreases in a straight line.
Conversely, when the magnetic field 30 is displaced in the direction in which it is pulled out, the
resistance value of the coil increases linearly. That is, the amount of change in resistance of the
coil is taken as a value proportional to the displacement INK of the coil from the optimum
operating point of the coil. Further, the magnetic flux f degree in the magnetic field 30 is as high
as several KGass to several tens KGasfl, and the resistance value of the coil changes with high
sensitivity. In the water device, when the micro coil body 23 deviates from the optimum
operating point due to the repulsion of the record board during record playing, this is detected as
a change in resistance of the coil 22a or 22b (z), and the tone arm 9 ? accordingly. The control
is performed so that-becomes zero. Specifically, the configuration is as shown in FIG. With
respect to the coil 22a of the pickup cartridge 2o, the resistors R11R21R5 form a bridge to form
a string, and a DC power supply 33 is connected to this bridge circuit. Here, in the bridge circuit,
it is assumed that the DC resistance when the coil 22a is located at the optimum operating point
and each resistance R, R2, Rs and RS are in a state of being balanced. The potential difference
between points A and B is zero. At the time of record playing, the coil made of NlCo film 22a is
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picked up in the French kingdom 30 according to the movement of the reproduction needle 25
and generates power as in the normal case 2 to output a reproduction signal and also changes its
resistance value or change Do. When the recording disk is face-turned or eccentrically rotated,
the micro coil body 24 is displaced largely according to them, and the reproduction signal
includes a low standing wave signal, and the frequency at which the resistance value of the coil
22a is low. To change. Here, the amount of change in resistance is proportional to the
displacement speed of the coil 22a: because it is proportional to the magnitude of the amplitude,
the frequency of change in resistance is low even though the frequency is low. The magnitude of
the change is large enough. The reproduction signal is produced by the speaker 5 through the
DC switches 3 and 4 in the same manner as in FIG. 1 through the DC blocking capacitor C.
On the other hand, if the resistance value of the coil 22a changes, the balance of the bridge
circuit will cause a potential difference between the disjunction points A and B, and the change of
the resistance value of the coil 22a will be taken as a potential difference between the points A
and B . The signal corresponding to the potential difference (и) is cut by the low pass filter 6 (f # 2
GHz) according to the signal recorded in the record sound groove, and the low pass output
component due to the record disc rotation, eccentricity, etc. Only the control signal is deposited
and applied to the electro-mechanical conversion unit 8 through the amplifier 7 and the tone arm
9 is pivoted so that the cantilever 24 is turned off and out to the coil 22a or the optimum
operating point. It is controlled. Here, the level of the control signal applied to the electromechanical converter 8: Q is sufficiently large according to the amount of deviation from the
optimum operating point of the coil 22a, so the above-mentioned operation 8 is stable and stable.
Minoru: C is done. Each of Fig. 2 shows only one channel in a single channel system, but it is ?'!
Air-machine change and face unit 8 ? ? Raw stone и) Coils 22a and 22b are provided at two
locations as 45 ░ -45 ░ at ? J core, and are configured as 7 /)-All the phycro coil bodies 23 are
It is controlled to the optimal operating point for F4'R (C for the case 1). As a result, 1 ? ? ? ?
(Monthly movement: h, <? ? ? / (/? / ?? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
? ? ? ? ? 23 (9) is stable at the optimum operating point for operation It is kept to a very
stable distortion free yayoi sound. Further, in the above-described pickup cartridge 20, since the
coils 22a and 22b themselves are formed of a material exhibiting a magnetoresistance effect, the
pickup cartridge 20 vibrates compared to the case where a magnetoresistance effect element is
not provided separately from the coil. The effective quality of the system Iakura will come W
without any additional power. Further, the present invention is similarly applied to the abovementioned printed coil type cartridge C] W, 1 and a spiral coiled cartridge. The moving coil type
pick-up blade ridges used in the present invention are formed of a material exhibiting a
magnetoresistance effect that generates electric power by interlocking C in the direction of
entering and exiting the magnetic field, and the resistance change of this coil Should be added to
the electro-mechanical conversion unit of the tone arm: Since the configuration is used as an IL
position detection signal, a coil position detection signal at a low frequency due to record runout
or the like can be obtained as a large level, However, the movement (10) for controlling the coil
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to the optimum operating position can be performed stably and reliably, and a distortion-free
reproduction sound can be obtained even when the recording board is warped or the recording
board is eccentrically rotated. I was able.
Compared to the case where the magnetoresistive element is provided separately from the coil,
the magnetoresistive element can be configured without increasing the effective mass of the
vibration system, and no additional device is required on the pickup cartridge side. It has the
feature that it can be as simple as possible.
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