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JPS5166803

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DESCRIPTION JPS5166803
2 Inventor 3 Patent applicant zip code 4304 agent zip code 110 [phase] Japan Patent Office ■
Japanese Patent Application Laid-Open No. 51-55 030 Japanese Patent Application No. 51.
(1976) 6.9. Japanese Patent Application No. 49- / 4034-'1. , (197 (4) /1.ff examination request
not yet requested (all four pages) Office serial number (, 'IC' 723 specification 1, title of the
invention cartridge coil wound on the tip of the yoke of the auxiliary magnetic path piece A
conversion system provided so as to be magnetically coupled to the yoke, a vibration system
formed by fixing a cantilever having a tip of a tip at a tip to a magnet, and the vibration system
held in the front N coyoke In the cartridge having a holder for holding the sub magnetic path
piece, the needle tip direction of the magnet is formed to be a convex surface, and the tip of the
sub magnetic path piece provided at the tip of the yoke is a surface of the magnet A cartridge
characterized in that it is formed to face each other
2, claims.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to cartridges, and
more particularly to proportional speed cartridges. The cartridges can be roughly classified into
speed proportional type cartridges and displacement proportional type cartridges, and the speed
proportional type cartridges mentioned above further have an ignition type and a moving coil
type. The magnetic type further includes a moving magnet type, an independent magnet type, a
moving iron type and a barrier pull reluctance type, and in the moving magnet type described
above, a cylindrical lignet is attached to the root of the cantilever. A suspension wire made of a
piano wire through a cylindrical braking rubber (damper) is generally attached to a support pipe,
and this configuration makes it difficult to stably hold the magnet between the pole pieces. there
were. Further, in the cartridge of such a structure, there are drawbacks such as the occurrence of
distortion due to the operating position of the vibration system and the unequal sensitivity K of
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the left and right channels. The present invention aims to eliminate the above-mentioned
drawbacks of the moving magnet type stereo cartridge described above, and is characterized in
that the distance between the magnet and the pole piece (brows) is at the time of movement of
the vibration system, that is, the disc It is an object of the present invention to provide a moving
magnet type cartridge in which the shape of the magnet is devised so that the distance between
the MagneEndPage: 1 set and the tip of the pole piece does not become uneven at the time of
reproduction. The present invention will be described in detail with reference to the
embodiments shown in the drawings. FIG. 1 is a cross-sectional view of the main part of a moving
magnet type stereo cartridge according to one embodiment of the present invention, wherein 1 is
a yoke and 2 is a coil bobbin. 3はコイル、4はカンチレバー、Sはマクネツ)、6idダンパー
+7はホルダー、8はサスペンションワイヤーである。 As shown in FIGS. 1 to 3, the yoke has
the small magnetic loss plate-like member 11 bent in a substantially U-shape to form magnetic
path pieces 12a to 12C, and an air gap 13 is provided between magnetic path pieces 12 & 12b.
The coil bobbin 2 is attached to the magnetic path piece 12C facing the air gap 13, and the coil 3
takes out a voltage according to the deterioration of the magnetic flux passing through the inside
of the yoke 1 in the heald frame n between the weirs 21a and 21b of the mosquito bobbin 2
Have been rolled up. Attaching the needle tip 41 at one end, the cantilever 4 made of, for
example, an aluminum alloy or the like having a relatively large large Young's modulus has a
high permeability such as ferrite or permalloy as shown in FIGS. The cantilever 4 is inserted into
a through hole 51 formed at the center of a front spherical or rear conical magnet 5 made of a
material of magnetic permeability so that one end thereof protrudes slightly beyond the through
hole 51, and the cantilever 4 is a reproducing needle A thin piano-wire-like thin piano wire fixed
to the other end of the cantilever 4 via a damper 6 provided with conical recesses on both sides
so as not to raise mechanical impedance as seen above and to effectively damp resonance The
bottom of one end 7 of a holder 7 of a nonmagnetic material such as a prismatic synthetic resin
having a width capable of being inserted between the magnetic path pieces i2a and 12b of the
yoke 1 with the suspension wire 8 fronted It is pulled out through the through hole 72 which
penetrates from the center to the other end of the concave portion 71 having a conical convex
portion and attached onto the convex portion, so that the cantilever 4 and the magnet 5 are not
displaced back and forth even if the reproduction needle is pulled by friction. It is fixed to
In this holder 7, as shown in FIG. 1, one end both corners of the plate-like members 14 & 14b
having small magnetic loss are cut 51 symmetrically, and the ends 15a and lsb are mounted on
the convex portion The bending magnet is bent so as to face the center of the spherical surface
52 of the moving magnet 5, and the bent portion is slightly narrowed from the inner wall surface
of the recess 71 to the outer surface of the holder 7 The pair of auxiliary magnetic path pieces
16a and t6b bent 90 ° in the same direction as the bending direction are integrally formed at
the time of holder formation, and one end of the auxiliary magnetic path piece 1aa and tab in the
recess 71 of the holder 7 A portion protrudes, and the other end of the magnetic path piece is
exposed on the side surface, and the magnetic path piece Ua of the yoke 1. It is magnetically
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coupled to 12b. Therefore, as shown in FIG. 2 and FIG. 3, a cantilever 4. for a conversion system
consisting of a yoke, a coil bobbin 2 and a coil 8 is used. マグネット5. The vibration system
including the damper 6 is inserted between the magnetic path pieces 121LI 12b of the yoke 1
via the holder 7 described above. FIGS. 4 and 5 show the state in which the moving magnet type
stereo cartridge 101 having the above-mentioned configuration is mounted in the shield case
102 (4). FIG. 6 shows the structure of a four-channel stereo cartridge based on the structure
shown in FIGS. 1 to 3. In FIG. 6, the same reference numerals as in FIGS. is there. In the figure,
reference numeral 103 denotes a cartridge mounting projection, reference numeral 104 denotes
a terminal for electrically connecting the cartridge of the tone arm 106 as shown in FIG. 5, and
reference numeral 105 denotes a lead wire of the coil. In the upper V embodiment, the shape of
the magnet is the front spherical rear cone shape, but the present invention is not limited to this
and the front spherical rear flat surface hemispherical shape and the damper may be formed in
the disk shape, It may be formed in a frusto-conical shape and a flat rear shape, or a front frustoconical shape and a rear conical shape. As described above, the shape of the magnet disposed
between the magnetic path pieces constituting the yoke is a shape having a convex surface in the
needle tip direction, and the front P-1F gnet is between the magnetic path pieces k, of the magnet
EndPage: 2 end one end is bent and the other end is fixed to the auxiliary magnetic path piece
which can be magnetically coupled with the magnetic path piece which constitutes the yoke. The
fitting makes it easy to make the gap between the yoke end and the magnet constant and small,
improve the output voltage, and stabilize the rotational movement center of the stylus, so that the
compliance is improved. It has the effect of being able to increase the size and improving the
tracing ability.
4. Brief description of the drawings FIGS. 1 to 6 all show an embodiment of the present
invention. FIG. 1 is an exploded perspective view of a moving magnet type stereo cartridge
excluding some parts, FIG. Fig. 6 is a front view of the main part of the moving magnet type
stereo cartridge and Fig. 6 is a sectional view of the same, and Fig. 4 and Fig. 5 are a part of a
shield case when the cartridge is mounted on a shield case. FIG. 6 is a cutaway perspective view
of the cartridge showing an embodiment in the case where the present invention is connected to
a 4-channel "teleo cartridge". 1・・・ヨーク、2・・・コイルボビン、3・・・コイル、4・・
・カンチレバー、5・・・マグネット、6・・・ダンパー、7・・・ホルダー、8・・・サスペ
ンションワイヤー。 Attorney at work, in 1. づ 良 ソ. '4), ↓]': I ', i- 2nd EndPage: 36, other than
the above, 110' jl '),': EndPage: 4
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