JPS49107505

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DESCRIPTION JPS49107505
Chemical patent II +-13t-February 16, 148 General manager of the Patent Office Name of the
invention Pick-up cart 1 Nonoji (other names) Patent applicant in Hitachi Ltd. · Hitachi, Ltd.
Public patent publication published in Japan Patent Office 0 Japanese Patent Application LaidOpen No. 49407505 ■ Filing date dated "f" (1973), 21; / / Request for examination at the end of
examination request (all three pages-) Description Title of the Invention Pickup Cartridge of the
Invention Pickup Cartridge of the Invention of the Invention
Inventor
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
reducing induced hum in a magnetic field □ -trit of record reproduction. There are various types
of electromagnetic type cartridges, such as moving magnet type, moving coil type, inductive
magnet type, and barrier pull reluctance type. In any type of method, change in the magnetic flux
passing through the power generation coil It is a method to take out the electromotive force by.
Therefore, when used in combination with a player, if an external magnetic field (for example, by
a modele or a transformer of an amplifier) is applied to the cartridge, magnetic flux passing
through the power generation coil of the cartridge by these external magnetic fields. There is a
change, and the cartridge also picks up sounds other than being cut-in 'in the record groove. とな
る。 As a method to reduce this induction ham, the coil for power generation is generally
contained in the case of permalloy material with excellent permeability, but the hole for inserting
the sleeve and the lead of the coil for power generation There is a hole for drawing out the wire,
it is not completely sealed, and it is affected by burn and external magnetic fields. In the present
invention, the sleeve insertion hole provided in the shield case at this point and the lead wire
lead-out hole are substantially perpendicular to each other, and the shield case. It blocks the
passage of magnetic flux inside and reduces the induction noise by one. FIG. 1 is conventional for
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explaining the present invention. FIG. 2 is a cross-sectional view of the cartridge, and FIG. 2 is a
cross-sectional view of a force-trid 7 according to the present invention. This will be described
below with reference to the drawings. 20EndPage: 1 In FIG. 1, 1 is a shield case, 2 is a shield case
lid, and the power generation coil 3 and the pole piece number are accommodated inside.
Reference numeral 5 denotes a hole provided in the shield case 1 for inserting the sleeve 11, and
6 denotes a hole provided in the shield case lid 2 for drawing out the lead of the coil 3. 8 is a
terminal for drawing out the output voltage to the outside, 9 is a cartridge case, and 10 is a case
lid. 12 is a rubber for supporting the cantilever 14 and a rubber for obtaining a damper effect,
15 is provided on the shield case 1 and the shield case lid 2 at the position of the sleeve 11 in the
layering direction, is there. In such a conventional cartridge, the warm magnetic flux from the
power supply transformer or the like of the record player's phono motor or amplifier enters the
inside of the shield case l from the sleeve insertion hole 5 during record playing and passes
through the pole piece 4 There is a drawback that the coil 3 crosses and flows out of the lead
wire extraction hole 6 to induce the induction ham in the coil 3.
The present invention reduces this induction ham, as shown in FIG. 42, as shown in FIG. 42, on
the side of the shield case 1 which shields the pole piece 4 and the coil 3 wound on the ball piece
4. Three in which the lead 11 is provided and the sleeve 11 is inserted. The same direction as the
direction of the insertion hole 5 is the shield case l. , The sleeve insertion hole 500,000, that is,
the direction substantially perpendicular to the insertion direction of the sleeve 11. A hole 6 'is
provided on the side of the 7-case 1. . The position of the hole 6 'is not necessarily perpendicular
to the insertion direction of the sleeve 11, but is preferably provided at a position close to the
perpendicular. Leakage magnetic flux from such a cartridge ° C phono motor 1) or the like
enters the inside of the shield case l from the sleeve insertion hole 5 but enters the sleeve
insertion hole 5 to pass through the inside of the shield case 1 It must be bent almost at right
angles and flow out of the lead wire extraction hole 6 ', so that the magnetic flux becomes
difficult to flow, and the magnetic flux entering the 2r-sleeve insertion hole 5b passes through
the shield case 1 of good permeability such as permalloy. It does not flow out of the case 9 and
flow across the coil 3 inside the shield case l. Therefore, no induction ham is induced in the coil 3
and no hum noise is picked up. As described above, according to the pickup cartridge according
to the present invention, the ratio of signal to noise becomes large in a pickup cartridge having a
small output signal such as a moving coil type without receiving unnecessary unnecessary
induction from the outside, and it is faithful I do not want to play the record.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional big-ag
cartridge and FIG. 2 is a cross-sectional view of a pickup cartridge according to the present
invention. 1 is a shield case, 2 is a shield case lid, 3 is a coil, 4 is a pole piece, 5 is a sleeve
insertion hole, 6 is a lead wire extraction hole, 9 is a cartridge case, 12 is a magnet for power
generation, 13 is a cantilever, 11 Is a sleeve and 15 is a knob. Attorney Attorney Attorney 1)
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Toshiyuki. 0EndPage: 2 list of attached documents (1) 1 specification (2) 1 drawing (3) 1 proxy
letter Inventors other than the above, patent applicants or agent inventors ,: 1 ′ ′% Sakuma
Shin EndPage : 3
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