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JPS5639700

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DESCRIPTION JPS5639700
1. A pickup cartridge comprising: a specification 1; a range 1 for obtaining a title 2.4 II FF 11; a
velocity amplitude proportional detection unit; and a displacement proportional detection unit.
ピックアップカートリッジ
3. Detailed description of the invention The present invention holds in the pickup cartridge, and
in particular (1) providing the velocity amplitude ratio fil type detection unit and the
displacement proportional type detection unit (1), from the former to the speaker driving signal,
from the latter to the tone arm control. A pickup cartridge configured to obtain a signal and hold
a cantilever at a mosquito appropriate operating point more reliably and stably to eliminate
reproduction distortion and to perform record reproduction with a good S / N ratio. The purpose
is In general, when a record is reproduced by a pickup cartridge, if the record is warped or the
record is eccentrically rotated, the cantilever becomes thicker (vertical movement, lateral
movement, and distortion occurs upon detection of a signal originally recorded) . This
phenomenon is also caused by the side force acting on the tone arm during record reproduction.
In addition, when the tone arm causes low-pass resonance due to the record warp or the like,
stable signal reproduction can not be performed. Therefore, there is a record player in which the
tone arm is controlled to keep the distance between the pickup and the record surface of the
cartridge constant to keep the operating point of the cantilever at the optimum position in order
to eliminate the convenience of the upper-handed arrangement. The tone player (2) EndPage: 1
time control device of this record player is constructed as shown in FIG. In the figure, 1 is a
record board, 2 is a pickup cartridge, and 3 is a tone arm. The signal picked up from the record
board 1 by the pickup cartridge 2 is amplified by the IITgt amplifier 4, passes through the power
amplifier 5 provided next, is applied to the speaker 6, and is produced from this. At the same
time, the signal amplified by the pre-amplifier 4 is applied to the low-pass F12E unit 7, and the
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low frequency signal component passing through it is applied to the electro-mechanical coupling
unit 9 via the control amplifier 8. The tone arm 3 is driven by the electro-mechanical coupling
portion 9 and appropriately rotated about the fulcrum 3a, and the position of the pickup
cartridge 2 is corrected and controlled so that the operating point of the canner lever 2a
becomes the optimum position. However, in practice, there are two disadvantages in the case of
using the speed amplitude type as the pickup cartridge 2 and in the case of using the
displacement detection type as the pickup cartridge 2, and there are the following disadvantages.
(1) When a velocity amplitude proportional type cartridge such as a movable coil type is used (3),
I JP-A 5'6-39700 (2) Output voltage-frequency characteristics are graph lines in FIG. As shown
(except that the amplitude of the recorded signal is constant).
That is, since the low frequency has a small velocity amplitude, the output voltage in the low
range is extremely small, and as the frequency becomes higher, the output voltage becomes
discontinuous (a gap is generated). Here, the distortion component due to the warpage of the
recording board has a very low frequency, so the output voltage obtained for tone arm control
becomes extremely small, and control becomes practically impossible. /-CJa, record playback is
performed without the need for special equipment. ■ When the displacement proportional
detection type cartridge is used for output Output voltage-I! The i1 wave number characteristic is
as shown by the graph line 2 in FIG. 2 (provided that the amplitude of the recorded signal is
constant). That is, the output voltage is sufficiently high even in the low frequency range, and by
controlling the output IK-1 part signal, it becomes possible to control the tone arm well. (4)
However, in the original signal reproduction, a special equalizing blow is necessary, and the
amplitude becomes smaller at a rate of 6 Ji B 10 ct as the reproduction excellence becomes
higher (in the case of constant velocity amplitude), the S ratio Is no longer able to reproduce well.
The present invention controls the tone arm by using the output compensation from the
displacement proportional detection unit to keep the operating point of the cantilever at the
optimum position, paying attention to the characteristics of the above-mentioned ≧ C: type of
big-step cartridge. This recording signal provides a pickup cartridge that enables stable, fine
pitch, and record distortion with little distortion by using detection superiority from speed
proportional detection 0 part- Along with the% embodiment will be described. FIG. 3 shows a
schematic construction of a first embodiment of the pickup cartridge according to the present
invention. The bicua and tub cartridge 10 shown in the figure is integrally provided with a
moving magnet type detection dll which is speed proportional type and a Hall element type
detection unit 12 which is displacement proportional type, and the signal detected by the former
is a raw plum signal. The signal (5) detected by the latter is used as a tone arm control signal. 13
is a cantilever, 14 is a movable magnet which is a base of the cantilever 13, 15 is a core, and 16
is a recording signal detection coil. The ll 'f11 stone type detection unit 11 is configured.
Reference numeral 17 denotes a hole rudder, and a control current is supplied through a lead
wire 18 which is stored in a central portion 17 of the core 15 in a conservative manner. The Hall
element type detection unit 12 is composed of the above-mentioned Hall cords 17, a core 15, a
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movable magnet 14, a force, a punch 13 and the like.
The core 15 has a configuration in which the coil core and the hall element core are shared.
Here, only the keel element type detection s12 in the pickup cartridge 10 is taken out and its
operation will be described. The fourth person shows the state in which the cantilever 13, ie, the
movable magnet 14 is located at the optimum operating position. Most of the magnetic flux 14a
from the movable magnet 14 flows as shown by the arrow, does not reach the Hall element (6),
EndPage: 2l7, and the output voltage from this is zero. 4) and 0 respectively show the cases
where the cantilever 13 is inclined at an angle θ upward and downward from the breakthrough
operation position. When the cantilever 13 tilts upward and downward, the magnetic fluxes 14b
and 14c flow in the core 15 as indicated by the arrows, the flux wedges are proportional to the
tilt angle θ, and the magnetic flux directions are opposite to each other depending on the tilt
direction. It becomes. Here, when the control magnetic field B is changed by changing the control
magnetic field B by the slope line to which a constant control current is supplied, the Hall voltage
is proportional to the control magnetic field as shown by the graph line 1 in FIG. It has the
property of producing V. Therefore, a voltage proportional to the cantilever tilt angle θ is taken
out of the output lead 19 of the upper 11 self-hole stacks 17. Further, in the range where the
angle θ is small, the displacement 12 of the tip and the angle θ are proportional, so that a
voltage proportional to the displacement 瀘 l of the tip is obtained more than the Hall element
17. Kamiki's pickup cartridge lO is (7) j9! As shown in FIG. 6, it is incorporated into the tone arm
control device. Tone arm control shown in FIG. 6! ! The wax is configured in substantially the
same manner as the apparatus shown in FIG. 1, the same reference numerals as in FIG. 1 for the
components shown in FIG. During record reproduction, the signal recorded on the record disc l is
taken out as an induced voltage proportional to the temporal change dφ (, -7) of the magnetic
flux flowing in the core 15 from the coil 16 in the pickup cartridge 10 through the line 20 It is
transmitted to the pre-amplifier 4 and is further output from the speaker 6 through the power
amplifier 5. On the other hand, a low-pass component signal outputted from the Hall element 17
and added to the low-pass F wave generator 7 through the line 21 and from which the midday
component is cut off at this time is used as a tone arm control signal. The tone arm control signal
is transmitted to the electro-mechanical coupling unit 9 through the control amplifier 8 to turn
and displace the tone arm 3. Since the tone arm control signal has a sufficiently high voltage and
has a voltage proportional to the needle point change amount l, as described above, the (8) tone
The arm 3 is stably controlled so that the pickup cartridge 10 is at a predetermined height
position with respect to the record disc l, that is, the cantilever 13 is at the optimum operating
position shown in FIG. Ru.
Here, the cutoff frequency * f1 of the low band P wave device 7 is about 20 (see FIG. 2). The
reason for this is as follows: (1) The movable arm 14 apparently comes to stand still at the
neutral position by the rotation control of the tone arm 3, and the frequency signal output below
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the above-mentioned disconnection frequency is not output from the coil 16, It is based on the
fact that when the non-reproducible frequency is 20 Hz or less, it does not cause an IPI-related
problem, and (2) the number of roundings of disturbances causing reproduction distortion is 20
Hz or less. これにより、レコード! l! Even when there is a warp at 11, the pickup cartridge
10 is controlled so that the height position from the record surface becomes one pair, and the
cantilever 13 and the movable magnet 14 are picked up centering on the optimum operating
position according to the recording signal of the recording sheet. Dynamically displace. As a
result, the recording signal is reproduced as a signal having no distortion ((9) good 8 / N ratio,
and is sounded from the speaker 6. FIG. 7 shows a 2 'embodiment of the pickup cartridge
according to the present invention. In the pickup cartridge 30 according to the present
embodiment, the output signal from the Hall element is taken into consideration in consideration
of the fact that the rotation control of the tone arm is generally performed in the vertical plane
and the horizontal plane instead of the 45 ° plane. It is configured to be used as a control signal
as it is without any signal processing. In the pick-up cartridge 30 shown in the figure, the coil
core and the Hall element core are provided separately. Reference numeral 31 denotes a left
channel reproducing coil core, and reference numeral 32 denotes a right channel reproducing
coil core, which are disposed on a 45 ° surface, respectively. Reference numeral 33 denotes a
core for vertical displacement detection, which is disposed in the vertical plane, and a voltage
corresponding to the displacement of the cantilever 13 in the vertical plane is output from the
Hall element provided in the middle of the core . Reference numeral 34 denotes a core for
horizontal displacement detection Hall element, which is disposed in the horizontal direction and
is provided in the middle of the core from the Hall element which is provided in the middle of the
core Water (lo) EndPage: Voltage according to displacement in 3 planes Is output. The former
rotates the tone arm 3 in the vertical plane, in order to offset the vertical movement of the
cantilever due to the warp of the recording disc, and the latter rotates the tone arm 3 in the
horizontal plane, Is this a disc eccentricity? This is to offset the lateral movement of the
cantilever due to the side force. Alternatively, any one of the cores 33 and 34, for example, only
the core 33 may be provided in the upper pickup cartridge 301C2, and the tone arm may be
controlled to rotate in the vertical plane.
FIG. 8 shows a third embodiment of the pickup cartridge of the present invention. This pickup
cartridge 40 is provided with a movable coil type detection unit 41 which is also of the speed
amplitude proportional type instead of the excitable stone type detection unit 11 in the pickup
cartridge 10 of the first embodiment shown in FIG. The detection unit 41 and the Hall element
type detection unit 12 are combined. In FIG. 8, the same reference numerals as in FIG. 3 denote
the same parts as in FIG. 3, and a description thereof will be omitted (11). The movable coil type
detection s 41 includes a micro coil plate 42 attached near the tip of the cantilever 13 and a
magnetic circuit 43 provided in connection with this. FIG. 9 shows an r * embodiment of the
pickup cartridge of the present invention. The pickup cartridge 50 is provided with a
photoelectric detection unit 51, which is also a displacement proportional type, instead of the
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Hall element detection unit 12 in the pickup cartridge 10 shown in FIG. And a combination of In
FIG. 9, constituent parts substantially the same as constituent parts shown in FIG. In the
photoelectric detection unit 51, a shielding plate 52 is fixed to the tip of the cantilever 13, and a
light source 53 and a light receiving element 54 are disposed in excess on both sides of the
shielding plate 52. The tone arm control signal is output from the accumulator 54. 8. As shown
in FIGS. 10 (8) and 8 (6), the photoelectric detection unit 51 has a plurality of light receiving
elements disposed on the upper side and the left side of the shielding plate 52, respectively. It is
also possible to independently detect the displacement and the horizontal displacement.
Reference numeral 55 denotes a light receiving element for vertical displacement detection,
which is disposed on the upper side of the shielding plate 52, and the amount of received light is
changed by the vertical displacement of the shielding plate 52 shown in the figure, and a signal
corresponding to the amount of vertical displacement is output. Ru. Reference numeral 56
denotes a light receiving element for horizontal displacement detection, which is disposed on the
left side of the shielding plate 52, and the amount of received light is changed by the horizontal
displacement of the shielding plate 52 shown in FIG. It is output. In addition, as the pickup
cartridge, a configuration in which a movable coil type detection unit and a photoelectric effect
producing unit are combined can be used. As described above, since the pickup cartridge
according to the present invention is configured to include the velocity amplitude proportional
type detection unit and the displacement proportional type detection unit, in particular, by
controlling the tone arm using the output signal from the latter. The control operation to hold the
cantilever at the optimum operating point can be performed stably, and a better reproduced
signal with less distortion and an S / N ratio than the former can be obtained, so that the record
can be reproduced well ( 13) By making the displacement proportional type detection unit
directly detect the force / vertical displacement of the lever, the output signal from the detection
unit is not subjected to the signal processing. In addition, it has superior features such as flight
control as a tone arm control signal.
4. Brief description of the drawings Fig. 1 shows a tone arm control device cooperating with a
conventional pickup cartridge. FIG. 2 is a graph showing the output electric-frequency
characteristics of the velocity amplitude proportional type pickup cartridge and the displacement
proportional type pickup cartridge in comparison with each other, and FIG. 3 is an M1
embodiment of the pickup cartridge according to the present invention. Figures showing
schematic configuration, Figures 4 (A) to 4 (Q respectively show the principle of the
displacement detection operation of the Hall element type detection unit in Figure 3; Figure 5
shows the output timing of the Hall element Graph, FIG. 6 shows the pickup shown in FIG. FIG. 7
schematically shows a tone arm control device cooperating with the cartridge, and FIGS. 7 to 9
are respectively the second and third pick-up cartridges of A: 8 bright. (14) EndPage: 4 Outline of
Fourth Embodiment, FIG. 10, tA) and β) are views schematically showing vertical displacement
detection and horizontal displacement detection operations in the photoelectric detection unit,
respectively. l · · · Record board, 3II III + tone arm, 4 · · · pre-amplifier, 5 O · · · power amplifier, 6 ·
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· · speakers, 7 · · · fist low-pass P wave device, 8-s 11 control controller, 9- '' Gfi-machine f8 '& m,
10, 30, 40, 50-pick-up cartridge, lllassable 1 II 11 i Ik stone type detection unit, 12φ · · Hall
element type detection unit, 13 · · e cantilever, 14--movable mug Uneven, 15-piece l core, 160 ·
Recording value number detection coil, 17 · · · Hall element, 18 · · · · · · · · · · · · · lead lead 20, 21 · · ·
· · line · · E coil core, 33, 34 · fist · hole core for the core, 41 · · · · · moving coil type moving part,
42 o · minute coil plate, 430 · magnetic circuit, 51 φ-· photoelectric type detection unit, 52・ 11
@ luck cover plate, 53 ■ · Light source, 54 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·. (15) FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 4,
FIG. 5, FIG. 7, FIG. 8, FIG. 8, FIG. 9, FIG. 5
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