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Description 1, title of the invention
Magnetic circuit for cartridge
3. Detailed Description of the Invention The present invention relates to a magnetic circuit for a
cartridge such as moving magnet type (hereinafter referred to as MM type) and moving iron type
(hereinafter referred to as MI type), and in particular to MM type sleeves having an improved
pole piece. The present invention relates to a magnetic circuit for stereo cartridge. As a cartridge
used for a stereo device, there are MM type, MI type, etc. For example, the magnetic circuit part
of the MMM cartridge is shown in FIG. 1 as a front perspective view in FIG. In the front, there is
provided a square hole 14 into which the cantilever EndPage: 1- (not shown) is inserted, □ for
the pair of left and right channels fixed to each other 90 'in the cantilever Magnet (Magnet). Are
located in the holes 14. Two pairs of pole pieces are provided as a magnetic circuit for passing
the magnetic flux generated by the magnet. For example, pole pieces 1 'and 2i for the left
channel are arranged opposite to the poles of the magnet for the left channel, the pole piece 1.2
being erected substantially perpendicularly in the shield 11 and coiled together in the vertical
part 10.8 is wound. The pole piece 1.2 is magnetically connected at its upper portion by the yoke
5. Pole piece for one right channel 3.4. The mutual relationship between the coil 9 and the cage
6 is the same as that for the left channel, the pole pieces 1 to 4 are molded as indicated by 7 at
the portion facing the magnet of the cantilever, the upper surface of the molded portion The coils
8 to 10 are fixed to each other. Although only one coil 9 wound on the pole piece 4 is shown as a
coil for the right channel due to the relationship of the drawings, the other one wound on the
pole piece 3 is naturally disposed in the same manner. Of course. In such a configuration, a pair
of cantilever cantilevers j has a pole piece 1.2 and one magnet pole in the insertion hole 14 of
the shield 11, and a pole piece When arranged, the magnet vibrates in response to
the vibration of the cantilever, the magnetic flux generated thereby changes in the pole piece and
the yoke, and the voltage induced in the coil by the change in the magnetic flux is an audio signal
As each one. However, in the magnetic circuit shown in FIG. 1, the frequency characteristic is not
good, or as shown in the figure, each pole piece is curved in relation to the cartridge, and the
urine is "waste" its permeability is " Magnetize.
In addition, both the ear and the left and right channels require four units, which is
disadvantageous in terms of workability and cost. Furthermore, the increase in the total magnetic
path length and the loss can not be avoided. Although some pole pieces and yokes are laminated
in a required number and so-called laminated structure is used, it helps to improve the
frequency-number characteristics, but the other above-mentioned drawbacks still exist. In
addition, as shown in (a) = magnetic side passage ascension front view in Fig. 2 and (b) as it is
housed in the shield case and shown in the side view, for example, one pole piece for left channel
and one old pole A single flat plate structure with both ends facing each other, 4 gnetts for the
left channel are inserted between them, and it is the first type to face both types. The same
configuration applies to the right channel. In this structure, since the pole piece is one flat plate
structure + for the left and right channels, as shown in the side view of (b), the relationship
between the coil 8 and the coil 8-9 is as described above. It can not be ruled out that each other
will have a predetermined angle. Therefore, the position of the coil, the fixation of the pole piece,
etc. are extremely difficult. The object of the present invention is to establish a magnetic circuit
for a carriture 9 except for the above-mentioned drawbacks. Hereinafter, the present invention
will be described with reference to the drawings. The table in FIG. 3 shows the 'embodiment of
the present invention. (A) is a front view, (2) is a side view, and (C) is a side view. The rear view,
(d) is a view showing the shape of the pole piece. The same parts as in FIG. 1 are indicated by the
same reference numerals. In the figure, the shaft-type shield case 11 in the open state is in the
open state, the side is the back side, and in the front, the pair of left and right fixed with the
cantilever (not shown) fixed to the cantilever. A rectangular insertion hole 14 is provided in
which an armature consisting of a magnet (not shown) is simultaneously inserted at right angles
to one another. At the insertion hole 14 part, the pole piece members 1j, 4 / of the shape shown
in (d) are fixed to each other on the molding material on the machine facing the magnet pole. For
example, the pole piece 2 member 2 'extends downward in a direction perpendicular to the
longitudinal direction at a tip of an elongated flat plate 15 having a predetermined length. A
square-shaped projecting plate 16 having a width a has an integral structure and a 1 × B singlesided glazed plate configuration. The member 1 'for the pole piece 1 is an elongated flat plate 17
having a length substantially equal to that of the member 2' and extends upward in the direction
perpendicular to the longitudinal direction at the tip end thereof. EndPage: Width a 'substantially
equal to the width of the two plates 16 The projecting flat plate 18 has an integral structure, and
has a single flat plate configuration.
The extension of the projecting plate 18 of the member 1 'is shorter than that of the projecting
plate 16 of the member 2'. The members 1 and 2 are respectively laminated to be pole pieces 1
and 2 so as to be slightly longer than the width of the cantilever magnet. The widths a 'and a of
the projecting plates 18 and 16 of the members 1 and 2 / respectively face both poles of the left
channel magnet of the cantilever, and the member length direction is parallel to the cantilever
length direction. Arrange as follows. Member 1 'if the magnet is mounted on the cantilever at an
angle of 45 ° to the horizontal. It will be mounted at a four angle to the 2 'horizontal plane or
the bottom of the shield 11. The coil 8 is wound around the rod-like portion of the pole piece 2
on which the member 2 'is laminated, and an audio signal for the left channel is derived. The pole
piece 3.4 for one right channel is also arranged in the same relation to the magnet for the right
channel, and the members 3 'and 4' constituting the pole piece 3.4 are also members 1 /, 2
respectively. / And 7-Coil 9 is wound, and an audio signal for the right channel is taken out. The
angle between the pole pieces 3 and 4 and the pole pieces 1 and 2 is 90 °. The angle between
the pole pieces 3 and 4 and the bottom surface of the shield 11 of the pole pieces 3 and 4 is 45
°. The lower pole pieces 1 and 3 are both carried by the mold 7 ′ and fixed to the shield case
11. The coil 8.9 is mounted on the upper surface of the mold 7 ', and the mold 7 supports the
pole pieces 3 and 4 leaving a little space adjacent to the upper surface of the shield 11 between
the cari's ring and the space of the cari ring. ing. Each pole piece is connected at the back of the
shield case 11 by a yoke 5 of a laminate configuration. Since the yoke 5 is generally connected to
the shield 11 and used as a loose ground, it is connected to the ground by a 7-shaped ground
spring 13. In order to firmly mount the magnetic circuit integrated by the mold 7.7 ′ with the
shield case 11, the wedge-shaped 8-stop member is provided in the space between the mold 7
and the upper surface of the shield 11. Insert the 12 to complete the whole. As described above
in detail, the pole piece has good permeability because no flat plate needs to be bent at all, and
the frequency characteristic is good because the flat plate and the laminate are also stacked in a
row with respect to the magnetic flux. Therefore, the flat plate can also be constructed in the
shortest distance, so that the loss can be small, and furthermore, the coil can be a single sided
single channel, which is also advantageous in terms of cost and production.
As described above, in the structure of the force of the present invention, the air flow path of the
Trille, it is possible to form a good magnetic circuit of the cartridge by solving the conventional
4. Brief description of the drawings. FIG. 1 is a front view showing an example of the
construction of the magnetic circuit of the pMM type cartridge. FIG. 1 (b) is a side view-0 FIG. 2
is another M'M type cartridge of the prior art. (A) is a front view, (b) is a side view after storage
of the deful, and FIG. 3 is a view showing an embodiment of the present invention, and (a) is a
front view, (1)) is a side view, (C) is a rear view, and (d) shows a pole piece member. Explanation
of main symbols 1-4 ..... ... pole piece 1 '-4' ... ... ... ... member for pole piece 8.9 ... song · · coil 7.7 '·
· ........ mold section s 15.17 ......... muntin plate 16,18 ......... projecting plate portion EndPage: 3