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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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In the pickup cartridge 1 of the invention, detection coils are respectively mounted on the legs of
the core having a pair of legs without seams and corresponding to each other, and in the
opposing working gaps of the free ends of the legs. In a cartridge adapted to mount a cantilever,
a detection coil in which the distance between the pair of legs is narrowed toward the shorted
base side and the free end of the core, and separately wound for each p ++ portion A pickup
cartridge in which fl: Ct is mounted through the working gap.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an MM type
pickup cartridge, and in particular, an improvement of its magnetic circuit portion. In this onetiered cartridge, it is known to laminate several sheets of a substantially U-shaped core thin plate
without an eyebrow; eyes and directly winding a detection coil on both legs thereof. Such a
magnetic circuit According to the cartridge having the head, it has been clarified that the high
frequency characteristics and the like at the time of reproducing the record become good.
Therefore, first, a magnetic circuit portion with a known seamless core and a winding method
thereof will be briefly described with reference to FIGS. 1 and 2. In FIG. 1, (1) is a magnetic
circuit as a whole, (2) and (3) are laminate cores having the same shape, that is, substantially Ushaped, (2a), (21)) and (3a). , (3b) are the legs corresponding to each other of the two cores, (2C),
(2d) and (3C), (3d) are the pole pieces which are the free ☆ 1 1j of each leg, (2e) and ( 3C) shows
the shorted base of each core (shorted core), both laminate cores (2) and (3) are opposite to each
other (inner, outer end face) in the central part of the shorted core (2e), <38 Intersections formed
from) are engaged. EndPage: 1, (4a), (4b), (5a) and (5b) (shown) are detection coils wound
directly on the legs of the cores (2) and (3), (6) is Cantilever, (force is mounted at its free end
stylus tip, (8) at the base of the cantilever, in the working air gap between the four pole pieces
(2C), (2d), (3C) and (3d) The bar magnet (holder is abbreviate | omitted) attached with gunper (9)
is shown. FIG. 2 is a route diagram for explaining the winding method to the leg portion of the
core in the magnetic circuit portion as described above. In this case, the core (2) is shown for
convenience, and the corresponding portions with FIG. It is attached. That is, although the
winding method as shown in the figure is well known, the outline thereof is to hold the core (2)
by the chuck of the winding machine and set the rotation center for each leg on both sides [in the
figure, The center of 2a) is made to coincide with the rotation center line C], while the coil wire
(4) fed out from the coil wire drum ([0] provided in a part of the winding machine is Leading to
the guide sleeve α disposed between the core legs, the leg (2a) as a whole gives rotation to the
core (2) while reciprocating the guide sleeve (I2) in the direction of arrow a. A coil wire (4) at the
end of the sleeve is wound directly on the leg (2a) as a detection coil (4a), and the detection coil
is also formed on the legs (2b) of the pair by similar operations. (4b) is wound.
However, since such a conventional core winds a coil wire directly to both legs, the insulating
coating of the coil wire is easily damaged by the leading edge of the guide sleeve or the corner
edge of the leg in the process, and the leg surface Insulating films are often damaged. Therefore,
an accident in which a short circuit occurs between the detection coil and the core and coil wire,
often resulting in a drop in yield of the finished magnetic circuit portion, and in addition, the
workability of the winding processing itself is also inefficient. The present invention has been
made in view of steaming point, and its object is to closely form a seamless core with a unique
shape and to attach a detection coil wound in advance as a separate part on its both legs. The
purpose of the present invention is to construct a magnetic circuit section, and thereby to
remedy the conventional shortcomings recognized in this type of car) IJ Judge.
Hereinafter, the present invention will be described in detail with reference to FIGS. FIG. 3 is a
side view for explaining an example of the core and the detection coil of the pickup cartridge
according to the present invention. In the figure, (20) is the whole of the seamless laminate core,
which should be understood as the L channel core conforming to the first example core (2).
(21A) and (21B) indicate a pair of mutually corresponding ridges, (the two shorts indicate the
short-circuited base (short-circuited core), and (22) indicate the engagement U-shaped notches
described above. In the present embodiment, the legs (21A) and (2tB) on both sides of the core
(20) are squeezed leftward from the side of the short-circuit base @ as shown in the figure to
exhibit a substantially delta shape. The free ends (21a) and (2zb), ie, portions of the pole piece,
are internally formed with horizontal horizontal sheet faces to form mutually opposing working
gaps (23), the distance W of which is set to a predetermined size It is done. In addition, the legs
(21A) and (21B) of the present example are both linear with the same width. And this invention
detects each other's free end (21a), for example, the detection cari # (24A) and (24B) wound as a
separate body in advance to both legs (2 囚, (21B) of the core (2 [) , (21b), through the working
gap <23), for attachment to symmetrical positions of the legs (21A) and (21B) respectively. That
is, in the figure, the detection coil (24B) is already attached to the leg (21B), and the detection
coil (24A) to be inserted is shown at the position facing the free end (21a) of the leg (21A). It is
done. The detection coils (24A) and (24B) of this example are obtained by winding a coil wire
around a thin-walled bobbin (25) formed of a resin molded product, and the shape of the inner
hole (25) of the bobbin is each leg The cross-sectional shape of (21A) and (21B) is made to
match, so that the detection coil is closely attached to each leg, but the bobbin of the detection
coil is fixed to the leg with an adhesive or the like Sometimes. In addition, an insulation process is
given to a leg part (2 factors and (21B) except for a free end part. In addition, the bobbin 05) of
this example is provided with a large-sized flange (25a) on the insertion end side, and a smallsized flange (25b) on the rear of the pair to make the back of the winding coil) Is a slope but
EndPage: 2 This is a relief for the holder of the cantilever. And the bobbin (the outline dimension
of the two insertion side flanges (25a) is determined in consideration of the relation with the gap
dimension W of the operation gap / 2 east, and the side of the free end (21a) to the leg portion
(21A) When fitting the detection coil (24A) from the bottom as shown by an arrow, the
movement locus of the flange (25a) is shown by a dot-and-dash line, and it is made to avoid
contact with the other free end of the leg (21b). Needless to say, the same applies to the
detection coil (24B).
Thus, according to the present invention, the detection coils (24A) and (24B) are pre-wound
separately with respect to the seamless core (20 both legs (21A) and (21B) in a novel and unique
shape. (However, these coils do not necessarily need a bobbin) From the free end side of each leg
through the working air gap (c), the drawbacks associated with the conventional magnetic circuit
as described above In addition, the frequency characteristics at the time of record reproduction
can be improved and the output loss can be further reduced. Next, another embodiment of the
present invention will be described with reference to FIGS. 4 and 5. In this case, the legs (21A)
and (21B) of FIG. 3 are straight in the same width. While the base portion of the leg or the short
circuited base (the width dimension of the two sides is widened, the legs (21C) and (21D) having
the tapered end hectares correspond to each other, The detection coils (24C) and (24D) without
bobbins as shown in FIG. 5 are attached to both side legs in the same manner as in the previous
example, and the outer shape of the detection carp # 24C, (24D) and The longitudinal direction
of the inner hole 06) is also tapered, but in particular, the taper of the inner hole (b) is made to
match that of the coil mounting point of each leg (21C) and (21D). However, since the taper
engagement is generally in a good close state, an air gap is hardly generated with a slight taper
error, and therefore the aspect as in this example is also practically advantageous. The same
reference numerals as in FIG. 3 denote the same parts in FIG. Furthermore and in connection
with the previous example, winding shaping techniques for bobbinless coils are well known. As
described above, the effects that can be provided by the present invention are already apparent,
and the practical benefits are great, in combination with the simple configuration.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing a
magnetic circuit portion of a cartridge of a type, FIG. 2 is a route diagram for explaining a
method of winding to a core leg portion, and FIG. FIG. 4 is a side view showing another example
of the core, and FIG. 5 is a perspective view showing another example of the detection coil. In the
figure, (20) is the whole core, (21A), (21B), (21C) and (21D) is the leg, (21a) and (21b) is the free
end, @ is the short circuited base, and the gradient is activated. The air gaps (24A), (24B), (24C)
and (24-D) indicate detection coils, (25) indicate bobbins, and (25) and (26) indicate inner holes.
EndPage: 3
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