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JPS5429601

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DESCRIPTION JPS5429601
DESCRIPTION OF THE PREFERRED EMBODIMENTS 1. Pick-up cartridge (1) A magnet, a
magnetoresistive element attached to the end face of the stone, and a vibrator comprising a small
piece of ^ magnetic permeability material distributed near the magnetoresistive element And
means for transmitting the motion of the record needle to the vibrator, causing the vibrator to
vibrate in response to the motion of the record needle, thereby changing the resistance value of
the magnetoresistive element, thereby producing an output. A magnetoresistive change type
pickup cartridge characterized by taking out.
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a
magnetoresistive variable pickup cartridge using a semiconductor magnetoresistive element.
Pick-up cartridge is the first stage to reproduce voice from irregularities of the record board, and
it is a place that has a large influence on reproduction fidelity and usually converts mechanical
vibration to electrical signal by relative motion of coil and magnet. Or, although MC type
cartridges are adopted, pickup cartridges in which various physical phenomena are applied have
been proposed. A pickup cartridge using a magnetoresistive element is one example, and this
cartridge is a so-called displacement proportional type in which an output proportional to the
displacement position of the magnetoresistive element can be obtained. Generally, when
comparing the MM type cartridge and the IC type cartridge, the MC type cartridge has a smaller
equivalent mass of the vibration system, has a good theoretical cut and can reproduce delicate
sounds, but has a small output and is expensive. The cartridge using the magnetoresistive
element has a configuration similar to that of the MC type EndPage: 1 cartridge, and the
vibration system is light in weight similarly to the MC type cartridge registration, and an output
comparable to that of the MM type cartridge can be obtained. With In the case of a cartridge
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using a conventional magnetoresistive element, the magnet (1), the pole piece (21,! The
magnetoresistive element (6) attached to the armature (5) is inserted into the air gap (4) of the
magnetic circuit constituted by the reed (3), and the record responds to the unevenness of the
record board The vibration of the needle (7) is transmitted to the magnetoresistive element (6)
via the cantilever (8) and the armature (5) fixed to the cantilever (8), whereby the
magnetoresistive element t61 is in the magnetic circuit. It vibrates in the air gap (4) and
generates an electric signal by the change of the flux core that contributes to the
magnetoresistive element (6) (! 41)). Such a conventional configuration is often undesirable
because it causes the magnetoresistive element itself with the lead wire to oscillate. In particular,
in order to make the vibrator (the magnetoresistive element) light, the base of the
magnetoresistive element must be thin, and the bonding portion of the lead wire can not be
reinforced by resin molding or the like. As described above, there was a problem in assembling
and adjusting a fragile object. Furthermore, in the conventional configuration, there is a problem
in separation of left and right channels when configured for stereo. This is because the shape of
the magnetic circuit, in particular the pole piece, becomes complicated in order to prevent the
output change with respect to the vibration in the direction perpendicular to the vibrator.
The present invention solves the above-mentioned drawbacks, and the embodiment shown in the
drawings will be described in detail with eight eggs. FIG. 2 is a perspective view showing a pickup
cartridge according to the present invention, and FIG. 3 is a side view thereof. In the present
invention, the magnetoresistive element (6) is attached to the end face of the magnet (1) and is
eight in a uniform magnetic field. On the other hand, the vibration of the record needle (7) is
transmitted to a vibrator (9) made of a high permeability material (for example, a thin plate of
nickel) through a cantilever (8) and an armature (vibration transmitter) (5). So that this vibrator
(9) vibrates. The magnetic flux at the end face of the magnet (1) diverges because the magnetic
En path is open, but when the vibrator (9) made of a high permeability material approaches, the
magnetic flux of that portion converges and the magnetoresistive element (6) The resistance
value of will increase. The details of the parts of the magnetoresistive element (6) and the
vibrator (9) are as shown in FIG. 4, and for the mounting base (6a), for the left channel
magnetoresistive element (6b) and the right channel A magnetoresistive element (6c) is provided,
and the magnetic flux of the magnet (1) penetrates the magnetoresistive elements (6b) (6c). In
FIG. 4, when the vibrator (9) made of a high magnetic permeability material overlaps the upper
side of the magnetoresistive elements (6b) (6c) (in FIG. 4, although it is positioned below, The
two ridge lines forming the tip of the vibrator are set at the positions indicated by the broken
lines, and the vibrator vibrates about this broken line position), and the magnetic flux of that
portion is converged and overlapped The resistance value of the magnetoresistive element in the
part is high. Therefore, when the vibrator (9) vibrates in response to the vibration of the record
needle (7), a resistance value change proportional to the displacement position of the vibrator (9)
is given to the magnetoresistive element (6), Thus, the output corresponding to the change in
resistance can be taken out. The lower sides of the magnetoresistive element (6b) and the
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magnetoresistive element (6c) are cut at 45 ′ ′ with respect to the perpendicular line, and the
two ridge lines forming the tip of the vibrator (9) are also respectively 1 It is inclined 45 ′ ′
against. The vibration extracted from the record needle is a composite of the vibration IDI and 1N
directions of the right and left channels. Signals can be taken out from the magnetoresistance
elements (6c) and (6b), respectively. The iJS diagram shows another embodiment, and in the
embodiment shown in FIG. 4, the magnetoresistive element itself is disposed in parallel with the
perpendicular direction [0] +11. The magnetoresistance elements are arranged 11 in the
respective vibration directions.
Now the vibration amplitude of the right (or left) channel or 1! Assuming that it is +, the
overlapping inner product of the transducer and the magnetoresistive element (which is
proportional to the signal output) is proportional to tjl at the side number in FIG. 5, but in the
example of FIG. The output is proportional to l / σ, and the example of Fig. 5 is better in terms of
sensitivity, but the example of Fig. 4 is easy to integrate the magnetoresistive element (and the
magnet cross-sectional area can be made smaller as well). Furthermore, there is an advantage
that the vibrator can be miniaturized. EndPage: 2 or more The operation of the cartridge of the
present invention is described, but the advantages are summarized as follows. 1) The structure is
simplified because a magnetic circuit consisting of a pole piece and a yoke is not required as in
the prior art. 2) Since the magnetoresistive element is identified in the magnetic field and the
element itself is not used as a vibrator, it is not necessary to make the magnetoresistive element
into a device, and it can be made robust. This makes assembly and adjustment very easy. 3) The
vibrator is a small piece of high permeability material, and in comparison with the conventional
method, only one amateur and one vibrator may be used for stereo, so 1i Ili no. It can be made
much smaller than that. 4) Cross-talk in the left and right channels is a problem of the vibrating
thread and is not affected by the magnetic circuit. As described above, the magnetoresistive
variable cartridge of the present invention is not only extremely simplified in structure, but is
also capable of improving the transfer characteristics and improving the channel separation by
reducing the mass. Fig. 1 is a side view showing a conventional pickup cartridge, Fig. 2 is a
perspective view of a pickup cartridge according to the present invention, Fig. 43 is a side view
thereof, and Fig. 4 is an enlarged view showing the arrangement of magnetoresistive elements
and vibrators. The fifth bacteria is an enlarged view showing the arrangement of the breaking /
gas resistance element and the vibrator in another embodiment. (1) Magnet, (5) Amateur, (6)
Magnetoresistive element, (7) Record needle, (8) Cantilever, (97 Vibration system. Patent
Applicant Sanyo% L Machine Co., Ltd. Representative Ige Tei Figure 1 Figure 3 Figure 4 Figure
5ai. EndPage: 3
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