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JPS56143799

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DESCRIPTION JPS56143799
Bright, 1d11, Title 2 of the Invention, Claim Category I (1) Tip (The cantilever is attached with a
stylus tip and is magnetized in the thickness direction and the pole piece protrudes from both
magnetic poles. The moving magnet is attached, and a signal, a detection coil is interposed so as
to intertwine the magnetic flux between the magnetic pole pieces according to the imaging
movement of the moving magnet with a predetermined gap between the 11 pole pieces of the
moving magnet. Manet type pickup cartridge.
Moving magnet type pickup cartridge
3. Detailed description of the invention This fully open relates to a moving magnet type pick-up
cartridge, and the clearance between the recording surface and the pick-up cartridge is sufficient
even if the vibrating system such as moving magnet or cut 1 / bar is small. An object of the
present invention is to make a vibration system smaller and realize a wider band as well as
ensure proper vertical tracking; and enable detection of a signal with less distortion by ensuring
a proper angle. (1) (A), Q3), (0 shows the conventional f 911 of the most common moving
magnet type pick-up cartridge, (A) is a perspective view, (b) is a front view, (0) (A-a [i is a plan
view, and in the figure, l is a stylus tip, 2 is a cantilever, 3 is a moving magnet, 4, 4 is a right
channel, a core for 5.5, is a left A core for channel, 6 and 6 are right channel signal detection
coils wound around the right channel core, 7.7 are left channel signal detection coils wound
around the left channel core, 8 is the moving magnet 3 in the holder 9 It is a damper EndPage: 1
for holding it in a freely vibrating manner. In such a conventional moving magnet type pickup
cartridge, since the cores 4 and 5 and the coil 6.7 are also included in the rule of the recording
surface 10 (as shown in FIG. When 15 ░ to 20 ░ is taken, the clearance t with the recording
surface 10 can not be made very large. On the other hand, shortening the cantilever 2 is an
effective means to improve the performance of the vibration system, but as described above,
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since the clearance t75E is small, if the I cesical vertical angle is secured, the cantilever 2 should
be made too short There is a missing official who can not do it. The present invention provides a
moving magnet type pick-up cartridge which eliminates the above-mentioned conventional
drawbacks, and FIG. 2 (A), Q3) and (0 schematically show its embodiment. (AJ view is a needle
view, (B) is a front view, (0 is a (b) view is a b-br sectional view, in this view, 11 is a stylus tip, 12
is a cantilever) , 13 are attached to the rear end of the cantilever 12 and are magnetized in the
thickness direction and have IS pole pieces 13a made of a soft biting material such as rope iron,
permalloy, etc. Is a protruding moving magnet, 14 is a U-shaped end 14a.
A right channel core 14b is disposed to interpose a predetermined gap between the pole pieces
13a and 13b, and a right channel signal detection coil 1 and 5 is wound around the core. 16 are
U-shaped both ends 16a, 16b above? A left channel core is disposed so as to be interposed with a
predetermined gap between the Fa4 pieces 13a and 13b, 17 is a left channel signal detection coil
wound around the core, and 18 is a vibration of the moving magnet 13 into the holder 19. A
damper for holding FIG. 3 is a schematic diagram for explaining the operating principle of this
moving magnet type pickup cartridge, showing only the right channel core 14 and the right
channel signal detection coil 15 wound therearound, and the right channel The core 14 is shown
in a modified form to make the explanation easy to understand, but in principle it is exactly the
same as that shown in FIG. 2 in principle. The third + N (A) d cantilever 12 and the moving
medium 13 attached to the rear end are neutral displacement media without displacement, and
in this state, as shown in the figure, the U-shaped core 14 is moved with both 414a and 14b.
Since the magnetic gear knobs G, G2, Crl 'and G2' between the pole pieces 13a and 13b of the
magnet 13 are almost equal, looking at this core 14 side, 1 'coming out of the N pole of the
moving magnet 13 The multi bundle enters the end 14a of the core 14 from the pole piece 13a
as shown by the arrow, and exits from this end 14a and enters the pole piece 13b and returns to
the S pole. is there. There is also a magnetic flux passing through the core 14. This cancels the
magnetic flux passing from the end 14a to the end 14b and vice versa, so that the right channel
signal detection coil 15 eventually penetrates the wound core 14. Since no result occurs, no
signal EMF occurs in the right channel signal detection coil 15 in this neutral state. Next, as
shown in FIG. 3B, when the cantilever 12 is displaced downward 01 in this figure by the right
channel groove of the record, the moving magnet 13 attached to the rear end of the cantilever
12 As shown in the figure, the magnetic gap c, G is small, the magnetic gap is stuck, and the 02
'is large, so the magnetic pole comes out from the N pole of the moving magnet 13 through the
pole piece 13a as shown by the arrow. The magnetic flux enters the end 14 b of the core 14,
penetrates the core 14 and exits from the end 14 a, enters the pole piece 13 b of the moving
magnet 13, S,?
Go back to Thus, a signal electromotive force is generated in the right channel signal detection
coil 15 wound around the core 14. In addition, as shown in Fig. 3 (G, as shown in Fig. 3), in the
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case where the cantilever 12 is displaced upward by ? in this figure, the moving magnet 13 is
inclined to (3) and the opposite EndPage: 2 pair, Since the gaps G and G2 'are small and the
magnetic gaps G and G2 are large, the flow of magnetic flux is also reversed from the figure Q3),
that is, the moving magnet 13ON pole passes through the pole piece 13a as shown by the arrow.
The flux enters the core-'tp 7414a, passes through the core 14 four times out of its end 14b, and
of the moving magnet 13! It enters the pole piece 13b and returns to the S pole. Therefore, a
signal EMF according to j peristaltic movement of the moving magnet 13 via the cantilever 12 is
generated in the right channel signal detection coil 15. Thus, the moving magnet 13 is moved by
the right channel groove of the record (B) in FIG. (In the case of tilting as shown in FIG. 0, how
the relationship between the core 16 for the left channel 16 and the pole pieces 13a and 13b of
the two n 416a and 16b tom-ping magnets 13 is as follows. When the moving magnet 13 is
inclined as shown in FIG. 2B, both the pole piece 13b of the moving magnet 13 and the M16a,
16b of the core 16 and the moving magnet 13 as shown in FIG. Between the pole piece 13a and
both ends 16a and 16b, so that the flux passing through the core 16 does not flow and the left
channel signal detection coil 17 Signal EMF does not occur. Therefore, the left and right channel
signals according to the left and right channel grooves of the record are respectively separated
and obtained. Fig. 4 (support), (B), (Q schematically shows the second embodiment of the present
invention, and its view is a perspective view, ?) is a front view, (0 is a view) FIG. 17 is a side
view, different from the first embodiment in that the left and right channel cores 16.14 are in the
original state, the left and right channel signal detection coils 17.15 are wound thereon, and the
cores and the entire coil Is disposed between the magnetic pole pieces 13a and x3b of the
moving magnet 13 with a predetermined gap therebetween. FIG. 5 is a schematic diagram for
explaining the operation principle of this second embodiment, showing only the right channel
core 14 'and the right channel signal detection coil 15 side wound therearound.
(A) is a neutral state in which the cantilever 1.2 and the moving magnet 13 attached to the rear
end are not displaced, and in this state, + flux from the pole piece 13a is indicated by an arrow,
Since the magnetic flux flows through the rod-like core 14 'so as to penetrate the pole piece 13b
at right angles to the longitudinal direction, the magnetic flux does not interact with the right
channel signal detection coil 15' wound around the core 14 '. There is no power. Next, as shown
in FIG. 5 (B), when the cantilever 12 is displaced by ?, ? ? upward in the figure by the right
channel groove of the record, the moving magnet 13 attached to the rear end of the cantilever
120 As shown in the drawing, the magnetic gap G, 02 'is small, and the magnetic gap G and G2'
25 are large, so that the magnetic flux coming out of the N pole of the moving magnet 13
through the magnet 4 piece 13a is indicated by an arrow. Thus, it enters from the upper end in
the drawing of the core 14 ', penetrates the core 14 and exits from the lower end, and enters the
magnetic piece 13b of the moving magnet 13 and returns to the S pole. Therefore, this magnetic
flux is linked to the right channel signal detection coil 15 wound around the core 14 to generate
a signal electromotive force. Further, as shown in FIG. 5 (0, when the cantilever 12 is displaced
downward in this figure by ?, the moving magnet 13 is inclined in the opposite direction of (8)
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in FIG. 5, and the magnetic gaps G, ', G, Is small and the magnetic gap G1rG2 'becomes sharp at
the dog's angle, so the flow of magnetic flux also passes through the pole piece 13a from the N
pole of the moving mag net иии 13 as shown by the arrow. The magnetic flux enters from the
lower end of the core 14 ', penetrates the core 14', exits from the upper end thereof, and enters
the pole piece tab of the moving magnet 13 and returns to S4. Therefore, a signal EMF according
to the vibration of the moving magnet 13 is generated in the right channel signal detection coil
15 '. Thus, the moving magnet 13 is moved by the right channel groove of the record (B) in FIG.
(In the case of tilting as shown in O, the magnetic EndPage of the left channel core 16 'tom-ping
magnet 13: relationship with the three pole pieces 13a and 13b) moving force as in ?) 13) force;
when inclined, (B) of FIG. 4 (((n), the magnetic field between the longitudinal surface of the core
16 and the pole piece 13a Since the entire gap is equally small and the magnetic gap of the
opposite side is large, the magnetic flux penetrating the core 16 'in the longitudinal direction
does not flow, so that the left channel signal detection coil 17 does not generate signal
generation and generation. .
The same applies to the left channel signal detection coil 17 corresponding to O in FIG.
Therefore, the left and right channel signals desired for the left and right channel grooves of the
record are obtained separately. The feature of this second embodiment is that the whole moving
magnet type pickup cartridge can be designed smaller and lighter than that of the first
embodiment. Fig. 6 (H, (B), (0) shows the third embodiment of the present invention according to
the present invention. (A) +, u is a perspective view, (B) is a front view. Fig. 10 (Q is a side view,
and the difference from the second embodiment is that the left and right channel signal detection
coils are 1.7.15'H H or less. FIG. 7 is a schematic diagram 4 for explaining the operation process
of the third embodiment, showing only one tongue of the right channel signal detection coil 15.
In FIG. Then, as shown in the figure, when the cantilever r12 is displaced upward by ?1 due to
the right channel groove of the record, the moving magnet 13 attached to the rear end of the
cantilever 12 is # "as shown; Since the magnetic flux emitted from 13a interacts with the right
channel signal detection coil 15, a signal electromotive force is generated in this coil 15. The
feature of this third embodiment is that there is no core in the signal detection coil, so there is a
possibility of the occurrence of magnetostriction at the most in-focus point. According to the
present invention, as described above, the moving magnet, which is magnetized in the thickness
direction and in which the pole piece is projected from its both seven poles, is attached to the
rear end of the cantilever having the stylus tip attached to the tip. The moving magnet type
pickup cartridge is formed by interposing a signal detection coil so as to interlink with the
magnetic flux between the magnetic pole pieces according to the peristaltic movement of the
moving magnet with a predetermined gap at the open pole piece of the moving magnet. As
apparent from FIGS. 2, 4 and 6, by eliminating the signal detection coil on the side of the record
surface 10, sufficient clearance between the pick-up cart 11 and the record surface 10 can be
obtained. 2 (FIG. 2 (O), the cantilever 12 is short and vertical tracking Even if the angle ? of the
recording surface IO and the pickup cartridge can be sufficiently taken, the cantilever can be
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shortened to make the vibration system smaller, and the signal generated by this can be reduced.
It is possible to obtain a signal with less distortion by maintaining a vertical tracking angle a
between 1 mm and 2 mm.
Brief Description of Four Sides Fig. 1 shows a conventional example of a moving magnet type
pickup cartridge, and its (, A) figure is an even view, a3) is a front view, (Q figure is (B A) a-d is a
plan view. FIG. 2 shows a first embodiment of the moving magnet type pickup cartridge
according to the present invention, wherein (N is a perspective view, (E) is a front view, and (0 is
b) in FIG. Fig. 3E is a biEf plan view, Fig. 3 (A), (B), and (Gri v'i first supporting feature); FIG. 4
shows a second embodiment of the present invention, wherein (A) is a perspective view, (1) is a
front view, and (CD is a (till Q view, FIG. 5 (A), (B) (C9a Sooffrh production + tI [figure. FIG. 6
shows a third embodiment of the present invention, in which FIG. 6 is a perspective view, (? is a
front view, (0 is a side view, and FIG. 7 is an operation explanatory view thereof). DESCRIPTION
OF SYMBOLS 10 ... Reconide surface, 11 ... Stylus tip, 12 ... Cantilever, 13 ... Moving magnet, 13a,
13b '-... pole piece 14, 14 ... Core for right channel, 15. 15 ', 15 ... right channel signal detection
coil, 16.16 ... core for left channel, 17, 17.17 ... left channel EndPage: 4 lines, word detection coil,
18 ... danno < -119 ... holder. Patent applicant Nippon Victor's license type company agent ? ?
? ? Page Page EndPage: ?
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