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JPS54105502

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DESCRIPTION JPS54105502
B) Description 1, the title of the invention
Electromagnetic pickup cartridge
3. Detailed description of the invention In the present invention, an armature made of a magnetic
material is fixed to the other end of the cantilever α whose tip is fixed to the tip, and this
armature is related to a magnetic circuit composed of permanent magnets, yokes and pole pieces,
Regarding the electromagnetic pick-up cartridge in which the above-mentioned cantilever
responds to the recording sound groove to induce an electric signal corresponding to the
recording sound groove to the generating coil wound around the yoke constituting the magnetic
circuit EndPage: 1 It is. In general, as shown in FIG. 1, in the electromagnetic pickup cartridge,
plate-like yokes 4 and 5 are fixed to both ends of a rod-like permanent magnet 3 magnetized in
the axial direction, and pole pieces 7a extended from one yoke 5 * 7b is made to correspond to
the other yoke 4 to form a magnetic circuit, and an armature 6 made of a magnetic material is
contained in the magnetic gap formed between the yoke 4 and the pole pieces 7a and 7b that
constitute the air magnetic circuit. When arranged, the armature 6 is supported by the support 9
made of a visco-elastic material, and the armature 6 is penetrated through the through hole 10i
provided in the yoke 4 constituting the magnetic circuit. Is fixed, and the needle tip 1 is wound
around the pole piece 7a * 7b constituting the magnetic circuit by the angular movement of the
cantilever 2 in response to the recording sound groove. Electric signal corresponding to the
record sound grooves in ° shoulder electric coil 8 were those to be induced. Although it is
necessary to cover the electromagnetic BIC amplifier car of such a configuration or the entire
induction magnetic field alloy shield case in order to shut off the external induction magnetic
field, in this case the magnetic flux of the water-immersion magnet 3 is a shunt. As a result, loss
of direct current magnetic flux occurs, the passing effect deteriorates, and there are serious
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drawbacks such as increase of hum noise. The present invention solves the above-mentioned
conventional drawbacks, and a first object of the present invention is to obtain an
electromagnetic pickup cartridge having high magnetic utilization efficiency and high conversion
sensitivity. The second object is to obtain an electromagnetic pinocanopocar-trinoge which is
symmetrical about the central axis, is simple in construction, and therefore highly accurate and
inexpensive. The third object is to obtain an electromagnetic type pink-up cartridge in which the
needle replacement structure is simple 5 and replacement with high accuracy is easy. また。 The
fourth object is to obtain an electromagnetic pinocquatorial cartridge having a low hum noise,
which can completely pass the external conductive magnetic field. The following is a description
of the electromagnetic binoculars of the present invention, together with the drawings of the
examples.
FIG. 2 shows an example of the configuration of the present invention, and in FIG. 1, the
cantilever 2 with the needle tip 1 fixed to the tip end is fixed to the armature 11 made of
magnetic material such as high magnetic permeability composite gold. Are configured. The platelike permanent magnet 16 in which the through hole 16a ° is provided at the center is
magnetized in the thickness direction, and the yokes 13a and 13b "extend from 5fffi (or Ni),
while N (ffi (or S pole) A plate-like yoke 16 is abutted and the yoke 14 extends through the
through hole 16 a of the permanent magnet 16. The tips of the respective yokes 13a, 13b, and
14 approach each other to form a pole piece portion, and a magnetic circuit is configured with
the armature 11. The armature 11 'is angularly supported between the front end of the yoke 14
and a visco-elastic body 12 made of synthetic rubber or the like. As shown in FIG. 2, the needle
13b is shown in FIGS. 4A and 4B and the direct current magnetic flux Φ is shown in FIG.
However, no voltage is generated in the power generation coils 18a and 18b wound around the
yokes 13a and 13b. When the tip 1 is displaced as shown by the arrow in FIG. 3A, the magnetic
resistance between the armature 11 and the yoke 13a is decreased, so that the flux ψ of the
yoke 13a is increased by one. AC magnetic flux flows as shown in. On the other hand, the
magnetic flux ψ 'of the yoke 13b decreases and an alternating magnetic flux as shown in FIG. 6B
flows in the direction of the arrow. When the tip 1 is displaced in the reverse direction as shown
by the arrow in FIG. 3B, alternating magnetic flux flows as shown in FIGS. 6A and 6B in the
reverse direction to the case of FIG. 3A.・ Generated coil 18a wound around. A voltage is induced
on each of 18b. したがって。 Both power generation coils 18 a so that these voltages are
coupled to each other. If push-pull connection of 1.8b, terminal 17a. An output voltage is
obtained at 17b. 7 and 8 show an application of the invention to a pickup for stereo according to
the present invention. In the figure, a suspension wire EndPage: 2y ear 19 consisting of a piano
wire or the like is fixed to the rear end of the cantilever 20. A visco-elastic body 12 such as
synthetic rubber is held between the tip end portion and the armature 11 and fixed by a
suspension wire 19 full screw 26 inserted through the hole 24 of the yoke 14. Then, four
crescent yokes 13a, 13b, 13c, 13de are arranged corresponding to the modulation axis of the
sound groove of the stereo record, and cruciform armatures 11 made of magnetic material such
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as high permeability alloy are arranged in each yoke 13a to 13d. ,, corresponding to the pole
piece of the tip of 14.
In addition, each yoke 13a to 13d has a generating coil 18a, 18b. 18c and 18d are wound and
connected to terminals 23, 23a, 23b, 23c and 23d fixed at the wire end to the terminal plate 22
respectively. Further, the entire case is made of a shield case 21 made of a high magnetic
permeability alloy to block the influence of the external and induced magnetic fields. 25 is a
needle guard. With the above configuration, an output voltage corresponding to an arbitrary
vibration direction can be obtained. In addition, as shown in FIGS. 9A and 9B, the armature 11 is
another application example to the pickup for stereo according to the present invention, as
shown in FIGS. 9A and 9B. In FIG. A vibration system consisting of the needle tip 1, the cantilever
2, the armature 11 and the visco-elastic body 12 is assembled to the porous rubbish 27
integrally formed on the knob 26, and the needle assembly 31 is formed by incorporating the
vibration system. The rear end of the pole piece 27 is in contact with the yoke 14 by inserting
the portion of the pole piece 27 into the hole 30 formed at the center of the front end of the
power generation system 32. またヨーク13a、13b、13c、。 The yoke projection is
inserted into the corresponding hole 29a, 29b, 29c, 29d (but a, C is not shown) of the needle
assembly 31 so as to project a little from the front end face of the 13di shield case 28 into the
armature 11. It is made to be localized in close proximity. With this configuration, the needle
assembly 31 can be easily and accurately detached from the power generation system 32, and
needle replacement can be easily performed. FIG. 12 shows another structural example of the
present invention, in which an axially long rod-like マ -Macha 33 made of a magnetic material
such as a high permeability alloy is held by a viscoelastic body 34 from the outer periphery at its
central part. It is supported by a body 37 and is configured to be angularly movable according to
the vibration of the needle tip 1 together with the cantilever 2. Further, the rear end of the
armature 33 is disposed close to the front end of the yokes 35a, 35b and '36. In the
electromagnetic type pink up cartrinon of such a configuration, the yoke 35a is only by the direct
current magnetic flux Φ, Φ 'flowing back in the neutral state of the needle point 1. No output
voltage is generated in the generating coils 38a and 38b wound around 35b, but when the
needle tip 1 is displaced in the direction of the arrow in FIG. 13, the reluctance between the
yokes 35a and 36 decreases and the yoke 35b As the reluctance between と and 36 increases,
alternating current fluxes ψ and ψ 'flow to produce an output voltage at the generating coils
38a, 38b. When the displacement of the first needle point 1 is in the direction opposite to that of
the thirteenth heel, the direction of the AC magnetic flux is reversed, and an output voltage is
generated at the power generation coils 38a and 38b.
Therefore, when taking out the output voltage to the terminals 39a and 39b, each output voltage
is added and FIG. 14 shows an application example to the pickup for stereo according to the
present invention, and in the figure, a cylinder integrally formed with the needle knob 4Q. 43 via
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the visco-elastic body 34 in the armature 33. The vibrator comprising the cantilever 2 and the
needle tip 1 is supported to constitute a needle assembly 42, which is detachably coupled to the
power generation system covered by the shield case 41. As a result, it is possible to perform
needle replacement with a very simple structure, easily and with high-precision localization
ensured. As described above, according to the present invention, a plate-like permanent magnet
having a through hole at the center and magnetized in the thickness direction, and four magnetic
materials extending from one pole face of the permanent magnet are provided. A yoke is a fifth
yoke extending from the plate-like yoke in contact with and in contact with the other magnetic
pole surface of the permanent magnet through the through holes of the permanent magnet, and
the fifth yokes are the tips of the four yokes. A magnetic circuit is constructed so that the pole
piece formed in the fifth yoke O surrounds the pole piece formed in the tip of the fifth yoke O,
and the cantilever whose tip is fixed to the tip with respect to this magnetic circuit Since an
armature made of a magnetic material fixed to the other end of the above-mentioned canna
EndPage: 3 rod is supported so as to approach each pole piece part constituting the magnetic
circuit by a visco-elastic body, the symmetry about the central axis Make it better It is possible to
obtain an electromagnetic type pink-up cartridge having high air utilization efficiency and high
conversion sensitivity, and also to improve needle exchangeability and to complete the passage
of an externally induced magnetic field to reduce hum noise. Have excellent advantages such as
the ability to
4. Brief description of the drawings Fig. 1 is a block diagram of a conventional electromagnetic
type up-up cartridge, Fig. 2 is a basic block diagram showing one embodiment of an
electromagnetic pickup cartridge of the present invention, Fig. 3A, B, Fig. 4 A, B, Fig. 6 A, B and
Fig. 6 A, B are the operation explanatory views, Fig. 7 is an electromagnetic pickup car of the
present invention) cross section showing one application example of IJ noji Fig. 8 is an assembled
perspective view thereof Fig. 9A. B is another structural view of the armature, FIG. 10 is a basic
structural view showing another embodiment of the electromagnetic pickup cartridge of the
present invention, and FIG. 13 is a basic structural view showing another embodiment of the
electromagnetic pickup cartridge of the present invention. FIG. 14 is a cross-sectional view
showing an application example thereof. DESCRIPTION OF SYMBOLS 1 ..... Needle point 2 .........
Cantilever 11.33 ... Armature, 12.34 ... Viscoelastic body + 13a + 13b, 13c, 13d, 35a, 35b, 14
degrees 36 · · Yoke, 15 · · · plate-like yoke, 16 · · · permanent magnet, 16a-through hole, 18a, 18b.
18c, 18d, 38a, 38b... Name of agent Attorney Nakao et al. 1 person Fig. 1 Fig. 4 Fig. 7 EndPage: 4
Fig. 9 AB Fig. 14 EndPage: 5
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