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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a
moving magnet type cartridge having a delta core, and FIG. 2 is a partial sectional view showing
the relationship between a core and a coil for explaining the present invention. The plan view of
the main part, and FIGS. 3 and 4 are cross-sectional views showing the shape of the bobbin used
to explain the present invention, and FIG. 5 is a perspective view showing one embodiment of the
cartridge of the present invention. Is a plan view of a partial cross section showing a core into
which a bobbin obtained by winding the coil is inserted. 1.2 is a core, 3a and 3b are legs, 4 is a
short circuit, 5.5a and 5b are coils, and 6.6a and 6b are bobbins.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moving magnet
type cartridge, and in particular to improve the coiling of the core to increase the efficiency of
the cartridge. The conventional moving magnet type cartridge is formed by winding a coil around
a core having a joint through a bobbin, which causes a leakage flux at the joint portion of the
core to cause a reduction in output. Although it is conceivable to use a core without seams (1) 7/ fro and flee to avoid the generation of the leakage flux, it is also possible to mount the bobbin
well in the conventional core shape. Is difficult, the distance between the core and the coil
increases, and the output decreases. On the other hand, the present applicant has developed a
moving magnet type cartridge in which the above points are improved. This cartridge is
constituted by a first magnetic core (1) having a so-called delta shape as a whole as shown in FIG.
1 and a second magnetic core (2) of the same shape. 111, each core fil and (2) forms a magnetic
gap g, and a pair of legs (3aH3b) extending in a planar line shape and a short circuit part (4)
which magnetically shorts the both legs (3aM3b) And the magnetic gap g is formed in the form
of a delta. These first and second cores (1) and (2) are a recess (1a) formed on the inner side of
the shorted portion (4) of the first core 11 and a shorted portion of the second core (2) 4) The
four parts (2a) formed on the outside are fitted to each other so that both short circuit parts +4) +
4) are mechanically connected so as to cross in a cross, and each 1ii 11 part (3a) (3b) A columnar
magnetic gap g is formed between the inner surfaces of the tips of the two. Also, in this case, (2)
9? −。 Each of the cores (1) and (2) is formed by laminating a plurality of thin cores each having
a thick finish. Then, a bobbin 16) C (6a ′ ′) (6b) ′: l in which a coil (5) ((5aM 5b)) is wound
around each leg (3a) (3b) of the core (1) and (2) respectively Are inserted from the tip end of the
leg and fitted, and the vibrator (7) is inserted into the columnar magnetic gear tube g. (8) is a
cantilever in the vibrator (7), (9) is a stylus added to its tip, (IQ is a sleeve to which this cantilever
(8) is attached, and the cantilever (8) is in the sleeve curve Although not shown in the drawings,
it is attached to the sleeve 110 via an elastic body and a magnet is also attached to a part of the
cantilever (8), and this magnet is attached to each end of each leg (3a) (3b) described above. It is
positioned in a columnar magnetic gear tube g formed by the inner surface.
In addition, the coils (5a) and (5b) which are turned around on the leg (3aM3b) of the first core
(1) are connected in series with each other, and from this, for example, the left signal is a stereo
signal, Also, the coils (5a) and (5b) connected to the Fil section (3a) and (3b) -hi of the second
core (2) are connected in series with each other so that, for example, the right signal It becomes
K to be taken out. (3)) '-With such a cartridge, high frequency characteristics are improved due to
the laminated core, and since the cores (1) and 12) are seamless, there is no leakage of magnetic
flux, and a large output can be obtained. Moreover, the core legs (3a) and (3b) of the bobbin (6)
having the coil (5) peaked because the core (11 and (2) is configured in a so-called delta shape
with the gap g at the top. Insertion and installation into the valley can be done in the valley, and
the bobbin (6) can be attached without giving any allowance to the legs (3a) and (3b), that is,
without opening a gap, thus the coil (5) and the legs (3a) (3b ') interval does not change and a
larger output can be obtained. By the way, in the case where a bobbin obtained by winding a coil
is mounted on such a delta type core, the structure as shown in FIG. That is, as the bobbin (6),
one in which the flange q is formed so as to extend at a right angle to the axis of the bobbin is
used. At this time, the bobbin (6) is the leg of the core-in the case of the leg (3a) When inserted
into the At the end of the 7 runes U ボ ビ ン of the bobbin (6) and the short circuited portion (4)
of the core, there occurs a portion u3 where the coil (5) is not wound. As a result, the number of
turns of the coil (5) decreases and the magnetic path length increases. (4) An increase in the
magnetic resistance due to an increase in resistance leads to a decrease in output. Also, the
holding of the bobbin (6) becomes unstable, the positional relationship of the coil (5) with
respect to the core becomes asymmetric, and crosstalk occurs. Further, in order to solve the
uneasiness of the above-mentioned bobbin (6), for example, as shown in FIG. 3, one flange q of
the bobbin (6) is connected to the flange portion (3a) (3b) of the core and the shorted portion (4)
It is considered to be formed in a shape that conforms to the shape of the connection portion of.
However, in this case, when the coil (5) is wound around the bobbin (6) via the nozzle: 3, it is not
possible to uniformly wind all parts of the bobbin. A part of the coil (5) is wound and a part I of
the coil (5) is generated, so that the coil (5) is likely to be deformed and the imbalance of the
output increases the crosstalk. Furthermore, if one flange 11 'of the bobbin (6) is formed as
shown in FIG. 4 in consideration of this point, the coil (5) can be prevented from being deformed
and holding of the bobbin (6) can be stabilized, However, even in this case, the magnetic
resistance increases and the output decreases as in FIG.
The present invention is the newly developed delta type core (5) 1 · · described above. In the
moving magnet type cartridge having the above, the above-mentioned drawbacks are further
improved. An embodiment of the present invention will be described below with reference to
FIGS. 5 and 6. In the figure, parts corresponding to those in FIG. 1 are given the same reference
numerals and redundant description will be omitted. That is, in the present invention, the pair of
legs (3a) and (3b) forming the magnetic gap g into which the imaging element (7) is inserted and
the two legs (3a) and (3b ') are magnetically shorted. In the delta magnetic core fl) and (2)
formed by connecting the end portion (4) seamlessly and continuously, the short-circuited
portion (4) and a part (3aM3b) each have an internal angle θ of 90 ° or more Make it
continuous so that Further, in the bobbin (6) [(6a) (6b)], the short circuit portion (4) and the leg
portion (3a) (f) of one of the flanges (16a) (16b) of the flanges (16a) fy-y7. 3b) and extend at the
same angle as the upper mounting angle θ with respect to the axis of the bobbin so as to be
inscribed in the continuous portion (19). 7. Wind the coil f51 ((sa) (5b)) against the bobbin (6)
thus formed 7. In that state, the front end of the leg portion (6) of the bobbin 6 against the
respective leg portions 3a and 3b of the cores 1 and 2 is a flange 16a of the bobbin 6 which is a
continuation portion of the core a9. Insert it so as to be inscribed in And both cores (1) and (2)
are mechanically connected by fitting of four parts (1a) and (2a) of a short circuit part (4)
respectively, and it forms between the insides of the tip of each leg (3aM3b) The intended
columnar magnetic gap gK vibrator is inserted to construct a desired moving magnet type
cartridge. In the shape of the bobbin (6), even if one flange (16a) is opened by 90 ° or more
with respect to the bobbin shaft as shown in the figure, the coil (5) is wound by the usual
method. It is possible to do. That is, as in FIG. 3, while rotating the bobbin (6) about its axis, a coil
is supplied from the nozzle of the angle to the shaft and 1 and the winding is performed by
relatively moving the nozzle and the bobbin in the axial direction. The coil (5) can be wound
uniformly and without gaps all over the bobbin (6). According to the configuration f of the
present invention to be described above, in the delta cores (1) and (2), the 1IllI portion (3a3 (3b)
and the end (4) tiger internal angle θ are made continuous to be 90 ° or more, and By forming
one flange (16a) of the bobbin (6) in accordance with this angle, when the bobbin (6) is inserted
by inserting the legs (3a), (7) 2 or (3b) K At the same time, the flange (16a) is inscribed in the
core continuous part αj and the holding of the bobbin (6) is stabilized, and the coil (5) can be
wound without loss to the cores (1) and (2) .
Therefore, the number of turns of the coil (5) can be increased, and the magnetic path length is
shortened to reduce the reluctance, and the symmetry of the position (ill) of the coil (5) is
maintained. It is possible to improve the efficiency of the cartridge by reducing the crosstalk and
reducing the A output. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view
showing an example of a moving magnet type cartridge having a delta core, and FIG. 2 is a partial
sectional view showing the relationship between a core and a coil for explaining the present
invention. 3 and 4 are cross-sectional views showing the shape of the bobbin used in the
description of the present invention, and FIG. 5 is a perspective view showing an embodiment of
the car of the present invention) IJ edge. FIG. 6 is a plan view with a partial cross section showing
a core in which a bobbin obtained by winding the coil is inserted. C1) f2 + is a core, (3a), (3b) is a
leg, (4) is a short circuit, (8) 'λ (5) ((5m), (5b)) is a coil, (6) ((6a) ( 6b)) is a bobbin. Agent Itou
Douguru Katsu9 (:) I ′ ′] 7 @ 9) ノ no (9) J FIG. 1 bekθka? one? 'P' Figure 2112 (1) 叶 FIG.
4 會 = 1 =) Desired-and Lω to 5 ′ ′ fs 55 Msirya 4 aa? ソ6)2? 、、、5b61. "" Fig.
6, a3a ',' a 'of m-ζ-5))) J7 (2) 1612 "l: 1-"-"Turtle-inventor other than the above, utility model
applicant or Attorney inventor address 7. '11 mountain /-訊 116-rn 7 35; Sony +1, the name of
the large public corporation 田 同 舒 氏 舒 41 [舒 同 address 所 place name 邦 代理人 agent
address Higashi Tobu Shinjuku Nishi Nishi Shinjuku 1-8 1 (Shinjuku Building) Name (8114) 'f +
4' l · 1 Katsuya Katsuya Address same place name (8088) 1 詣 1 隈)-) 1 r Z R 2