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JPS52109905

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DESCRIPTION JPS52109905
1. A pole piece base for holding a pole piece constituting a magnetic circuit of a cartridge of a
pickup and a pole piece base between a shield case of the cartridge and a pole piece base of a
cartridge An electromagnetic picker characterized by having a structure disposed so as to cover.
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2, the scope of claims
Detailed Description of the Invention The present invention relates to an electromagnetic pickup
cartridge. 5, FIG. 1 and FIG. 2 which are concerned are conventionally used. It is 15 sectional
drawing which shows the structure of the pickup cartridge of an electromagnetic type. At the tip
of the cantilever 1, a stylus tip is configured to contact a groove on the record board with a joint
sale. At the back end of the cantilever 1 A pole piece 2 made of a magnet or a magnetic material
is attached and ? 2 ░, and its vibration changes the reluctance of the magnetic circuit formed
by the bony pieces 3a and 3b to change the flow of magnetic flux in the magnetic circuit. An
electromotive force is induced in the coil 4 wound around the periphery of the coil. Although the
pole peimelo a and 3b which comprise a magnetic circuit are comprised from high magnetic
materials, such as permalloy, the magnetic flux generate | occur | produced inside that is several
gauss to 10. Because it is as small as gauss, the necessary electromotive force. In order to obtain,
the number of turns of the coil 4 extends to several 1'000 turns. l и ?Because of this
configuration, from the outside world. It is extremely important to prevent induced magnetic flux,
and the entire magnetic circuit including the coil 4 is housed in a shield case 5 made of a high
magnetic material such as permalloy. ???????? (13) The cantilever 1 has a length of 7
mm or less and a setting angle of 15 to 25 degrees with respect to the record surface is required,
and the cartridge body of the pickup is connected with the stylus tip at the tip. In order to avoid
contact with the record board, the pole piece 2 must be placed in the immediate vicinity of. -Also,
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since the pole pieces 3a and 6b are arranged according to this, as shown in FIG. 1 or FIG. 2, the
bony pieces 6a and 3b and the shield case 5 are extremely close in the vicinity of the pole piece
2. Placement. ????????? Due to the above structure, the magnetic flux easily leaks from
the pole pieces 6a and 3b to the shield case 5, and the high frequency band in which the effective
permeability ? and the pole permeability of the pole pieces 5a and 3b decreases is The leakage
becomes a dog and the effective flux through the coil 4 decreases. FIG. 6 shows the deterioration
of the characteristics due to the magnetic flux leakage to the shield case 5. The vertical axis
shows the output in dB and the horizontal axis shows the frequency f in KHz. In the figure, the
solid curve is the characteristic curve when the shield case 5 is not used, and the two dotted
curve is the characteristic curve when the shield case 5 is used. When the shield case 5 is used,
the output in the middle and high frequency band is It is apparent that the present invention has
overcome the problems with the cartridge of the conventional electromagnetic type pickup
described above 9 and improves the characteristic deterioration in the middle and high
frequency band due to the magnetic flux leakage to the shield case 5. is there.
FIG. 4 is a front view and a cross-sectional view showing the configuration of an electromagnetic
pickup cartridge according to the nineteenth invention. However, the figure is a stereo pickup
cart. For one channel of the ridge identical configuration. Only. In the front view, the shield case
5 and the vibration system are omitted. In FIG. 4, 1 is a cantilever with a stylus tip joined to its
tip, 2 is attached to the rear end of cantilever 1 and 9 is not shown, but its center is supported. It
is a pole piece made of a disk-shaped magnet. When the stylus tip at the tip of the 1 ? cantilever
1 vibrates corresponding to the groove on the recording board, the pole piece 2 vibrates through
the cantilever 1. Therefore, 1. The magnetic resistance of the magnetic circuit formed by the
upper pole piece 3a, the lower pole piece 3b, and the yoke 6 changes, and the magnetic flux flow
in the 2 и) system changes. Since the coil 4 is wound around the portion where the upper pole
piece 6a and the lower pole piece 3b are joined to the yoke 6, the flux flow of the magnetic
circuit formed by the upper pole piece 3a, the lower pole piece 6b and the yoke 6 Changes, an
electromotive force corresponding to the vibration of the stylus tip is induced in the coil 4 and 9
electromechanical conversion is performed. Usually, the upper pole piece 6a and the lower pole
piece. The sleeve 3 b is embedded in a resin to form a pole piece base 7. As shown in FIG. 4, the
cartridge structure of the pickup-the upper pole, in the parts of 8a and 8b. Since the piece 6a and
the lower pole piece 6b are close to the shield case 5, leakage of magnetic flux is likely to occur
at this portion. In order to prevent this, in the cartridge of the pick-up according to the present
invention, most of the part in contact with the shield case 5 around the pole piece base 7 is made
of a metal material with low electrical resistance such as a thin copper plate 2.degree. After being
covered, it is configured to be stored in the shield case 5. The thickness of the thin plate-like
copper plate 9 used in this case is 01 to 0.2 mm, and is drilled in the lower front of the pole piece
base 7. To match the insertion hole of pole piece 2. An insertion hole 10 is bored in the front
surface. The thin copper plate 9 may be disposed between the pole piece base 7 and the shield
case 5. As a simple molding method, it may be cut and placed in a shape as shown in FIG. 5, for
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example, and it may be bent and formed according to the pole piece base 1 ? 7 and pressed into
the shield case 5. .
The thin copper plate 9 has a low electrical resistance of 1.7 О 10 ? ? ? и m at 20 ░ C., so
that the magnetic flux penetrates therethrough. As a result, an eddy current is induced, and
magnetic flux in the reverse direction is generated by the eddy current, and the leakage of the
magnetic flux from the pole pieces 3a, 3b to the shield case 5 is significantly reduced. FIG. 6
shows an aspect of the improvement of the characteristics of the end page: dipolarity due to the
reduction of the magnetic flux leakage in the cartridge of the pickup according to the present
invention having the configuration described above. In FIG. 6, the vertical axis represents the
output V in dB, and the horizontal axis represents the frequency f in KHz. The curve indicated by
9 dotted lines in the figure is the characteristic curve of the cartridge of the conventional pickup,
and the curve indicated by the solid line is the characteristic curve of the cartridge of the pickup
according to the present invention. It is clear that in the cartridge of the pickup, the output sag in
the middle and high frequency bands is improved as compared with the conventional pickup
carrits. As a result of trial listening, it was also confirmed that if the cartridge of the pickup
according to the present invention is used, "a high-quality sound quality can be obtained in the
high sound band-compared to the conventional one. As described above in detail, in the car of the
pickup according to the present invention, as described in detail above, the leakage of the
magnetic flux from the pole pieces 3a and 3b inside the cartridge to the shield case 5 is achieved
by using a simple internal shielding means. The output frequency characteristics of the pickup
cartridge ?T? as a mechanical-electrical conversion device can be greatly reduced, and the
output sag in the middle and high frequency 2 ░ band is improved, and the treble band is
improved. You can get good sound quality. From the point of view, in order to prevent magnetic
and electric induction from the outside world, permalloy-copper laminated shield case of
magnetic recording head, cartridge shield case of pickup where permalloy and aluminum alloy
plate are laminated are used. . However, in the cartridge of the pickup according to the present
invention, the internal magnetic circuit is internally shielded by an extremely simple means, and
the leakage of the magnetic flux from the 1 ? ? ? pole piece inside the cartridge to the shield
case is greatly increased. It is possible to obtain a high-quality sound quality in the high-tone
band, and its industrial significance is extremely deep.
4. Brief description of the drawings FIGS. 1 and 2 are cross-sectional views showing the
configuration of a pickup cartridge conventionally used. FIG. 6 is a characteristic curve showing
deterioration of characteristics due to leakage of magnetic flux to the shield case, FIG. 4 is a
drawing of the cartridge of the pickup according to the present invention, and FIG. Drawing
showing an example of shape. FIG. 6 is a characteristic curve showing the improvement of the
characteristics of the cartridge of the pickup according to the present invention. DESCRIPTION
OF NUMBERS 1 и и и и 2 и и и pole piece 6a и и и upper pole piece 6b и и и lower pole piece 4 и и coil 5 и и и
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shield case 6 и и и yoke 7 и и и pole Piece base 8a, 8b иии Proximity 9 иии Thin plate copper plate 10 иии
Insertion hole 1 Fig. 2-Fig. 13 (kHz) EndPage: ?
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