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2 Inventor 3 Patent applicant mail (關 @ 4504 agent zip code 110 phone (834) 3621 (de) ~ 6
[phase] Japan Patent Office 0 JP-A-5 51 568040 published Japan JP 51. (1976) G, 96'16 'I 23
Specification 1, Title of the Invention A yoke on which a cartridge coil is wound, a cantilever
having a tip of a needle tip at its tip fixed to a magnet and a vibration system provided in the
yoke A cartridge having a holder for holding the vibration system in the yoke, wherein a surface
of the magnet in the tip direction of the magnet is formed in a frusto-conical shape centering on
the axial direction of the front P cantilever and having the tip direction as an apex. The cartridge
C is characterized in that the front end of the yoke is opposed to the frusto-conical inclined
surface of the magnet.
2 Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to cartridges, and
more particularly to proportional speed cartridges. The cartric can be roughly divided into a
speed proportional type cartridge and a displacement proportional type cartridge, and the speed
proportional type car described above further includes a magnetic type and a moving coil type in
the above L2 magnetic type Furthermore, there are moving magnet type independent magnet
type, moving iron type and variable complete reluctance type, and the moving magnet type
described above has cylindrical magnet 10 at the base of the cantilever, which is a cylindrical
damping rubber (damper In general, a suspension wire made of a steel wire is attached to a
support pipe, and it is difficult to stably hold the magnet between the pole pieces. Moreover, in
the cartridge of such a structure, distortion occurs due to the operating position of the vibration
system, and the sensitivity of the left and right channels become irregular. O The invention
eliminates the drawbacks of the moving magnet type stereo cartridge described above The
purpose of this is that the feature is that the distance between the magnet and the pole piece
(yoke) (7) EndPage: 1 during the movement of the vibration system, that is, the distance between
the magnet and the tip of the pole piece during disc reproduction. The present invention provides
a moving magnet type cartridge in which the shape of the gnet is contrived so as not to be
uneven. 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 an 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、5はマグネット、6はダンパー、7はスタイラ
スサポート。 8 is a suspension wire, and 9 is a holder. As shown in FIGS. 1 to 3, the O-yoke 1
symmetrically cuts both end corners of a plate-like member with small magnetic loss, and the tip
portions 11a and ub Is bent so as to be perpendicular to the inclined surface of the frusto-conical
magnet described later, and is bent in a substantially U-shape so as to form a gap n with a certain
distance between the tip parts and is opposed to the gap 12 A coil bobbin 2 is attached to the
magnetic path piece 13, and a coil 3 for taking out a voltage according to the change of the
magnetic flux passing through the yoke 1 is wound around a weft frame 22 between the weir
21a, 2xb of the bobbin 2 . The cantilever 4 made of, for example, an aluminum alloy or the like
having a relatively large Young's modulus with the needle tip 41 attached to one end has a high
magnetic permeability such as ferrite or permalloy, as shown in FIGS. The cantilever 4 is inserted
and fixed in a through hole 51 formed at the center of a frusto-conical magnet 5 made of a
material such that one end thereof slightly protrudes from the through hole 51, and the
cantilever 4 The thin piano wire-like suspension wire 8 fixed to the other end of the cantilever 4
via the damper 6 for preventing the mechanical impedance as seen from rising and for effectively
damping the resonance has a cylindrical shape made of, for example, a ferrite system. The
cantilever is pulled out and attached through the inside of the through hole 71 opened at the
center of the stylus support 7 and the reproduction needle is pulled by friction.
The magnet 5 is fixed so as not to be displaced back and forth. (! Cantilever mentioned above. ム
ービングマグネット5. The vibration system consisting of the damper 6, the stylus support 7
and the suspension wire 8 is a through hole through which the stylus support opened at the
center of the prismatic holder 9 of nonmagnetic material such as synthetic resin can be smoothly
pressed and held. As shown in FIG. 1 and FIG. In contrast to the conversion system consisting of
the coil bobbin 2 and the coil 3, the above-described nine vibration system is the tip 11 a of the
yoke 1 via the holder 9. 11b and the inclined surface 52 of the magnet 5 are mounted so as to be
substantially orthogonal and the gap between them can be kept constant. 0 FIG. 4 shows the
moving magnet type stereo cartridge 101 of the above-mentioned configuration mounted in the
shield case 102. It indicates the state. FIG. 6 shows the construction of the L7t 4-channel stereo
cartridge based on the constructions shown in FIGS. 1 to 3. The same reference numerals as in
FIGS. 1 to 4 in the drawing denote the same constituent members. (4) In the top view, 108H
cartridge mounting protrusion, 104 is a terminal for electrically connecting the cartridge to the
tone arm 106 as shown in FIG. 5, and 105 is a lead wire of the coil. In the first embodiment, the
magnet has a frusto-conical shape, but the present invention is not limited to this. The front may
be frusto-conical, and the rear may be conical. In the first embodiment, the yoke is bent so that
the tip thereof faces the frusto-conical surface of the magnet, but not limited to this, it is
magnetically coupled to the substantially U-shaped yoke and The magnet may be divided into a
member having a portion opposed to the surface of the magnet and may be separately
configured. As described above, the shape of the magnet disposed in the gap between both ends
of the yoke is a frusto-conical shape and both ends of the yoke The part is bent so as to face the
inclined surface of the frusto-conical body of the magnet, and is fitted from the magnet or the
like. Since the vibration system is fitted between the yokes via the holder, it is between the yoke
end and the magnet as compared to the case where the conventional disk-like magnet /
cylindrical magnet is used for EndPage: 2 This makes it easy to make the gap constant and
smaller, improve the output voltage, and stabilize the center of rotational motion of the stator, so
that the compliance can be increased and the tracing ability can be improved. .
4. Brief description of the drawings FIGS. 1 to 6 show an embodiment of the present invention,
and FIG. 1 is a cross-sectional view of the main part of the moving magnet type stereo cartridge,
and FIG. Similarly, FIG. 3 is an exploded perspective view excluding some parts of the same, and
FIG. 4 and FIG. 5 are a perspective view and a portion of the shield case when the cartridge is
mounted on the shield case. Fig. 6 is a cutaway perspective view of a cartridge showing an
embodiment in which the present invention is continuously mounted on a four-channel stereo
cartridge; 01 ... yoke, 2 ... coil bobbin, 3 ... coil. 4・・・カンチレバー、5・・・マグネット、
ホルダー。 Patent applicant Nippon Musical Instruments Manufacturing Co., Ltd. ・ ・ ・; Naka
+ 'i + ,,', 弘 i i, i 1. 1. ・∼、・111・−X′″!? EndPage: 36, agent zip code other than the
above 11016-EndPage: 4
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