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Description 1, title of the invention
Electromagnetic type pink-up cartridge and method of manufacturing the pole piece assembly
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a pole piece assembly of an electromagnetic pick-up cartridge, in particular by
providing a pole piece assembly which is simple and whose dimensional accuracy is greatly
improved. It is an object of the present invention to significantly improve the transfer
characteristics and channel separation characteristics of the cartridge. In general, is the quality of
the pickup cartridge changed in the magnetic flux generated in the vibrating part? It is
determined by how to faithfully transmit power to the yoke and coil, and in particular, it is
important that the loss of the magnetic circuit be small, and its frequency characteristics must be
flat. Furthermore, in one conventional stereo record electromagnetic pickup cartridge, it is
necessary to completely separate and separate the left and right channels, and to make the
lengths of the magnetic paths equal to each other. From the above point of view, simple blocklike Q hole pieces are formed using flames, lights, etc. excellent in high frequency characteristics,
and these pieces are combined to form a pole piece assemblage, and the current of the pole piece
and yoke is reduced. An electromagnetic pickup cartridge has been conventionally provided
which can reduce loss such as loss and equalize the lengths of magnetic paths of both left and
right channels, and obtain high sensitivity and flat transfer characteristics over the required
frequency band. did it. An example will be described with reference to FIGS. 1 and 2. In the
figure, 1 is a needle lever, 2 is a needle tip attached to the tip of the needle lever 1, 3 is a moving
magnet attached to the rear end of the needle lever 10, and 4 is an elastic material for
supporting the movable magnet 3. A damper 6 is a sleeve for supporting the needle lever 1 via
the damper 4. These needle levers 1 to 6 constitute a vibrating portion. Numerals 6, 7 and 8.9
are pole pieces made of ferrite, and the curved surface 6a of the same curvature is provided on
the lower end side of each pole piece 8.9. 7a, 8a + 9a are formed. The four pole
pieces 6.7 and 8.9 have the same shape two by two. That is, the pole piece 6 ░ 8 and the pole
piece 7.9 have the same shape as each other, EndPage: 311, and the pole piece 6.8 is smaller
than the pole piece 7.9. Are these pole pieces a small pole piece set consisting of pole pieces 6.8?
There is a cylindrical piece of space n formed by the curved surfaces 6a to 9a of each pole piece,
arranged in parallel so that the pole pieces 9 and 9 forming the large pole piece set are disposed
on both sides of the pole piece. The pole piece assembly 21 is constituted by integrally
connecting magnetic pieces in a magnetically insulated state by interposing spacers 22, 23.24
and 25 made of nonmagnetic material between the pole pieces.
In addition, a U-shaped yoke 13.14 similarly formed of ferrite is magnetically coupled to the
upper surfaces of the pole piece 6.7 and the pole pieces 8 and 9, respectively, and each yoke
13.4 is magnetically coupled. A coil 15.16 and a coil 17.18 are wound around the coil 14,
respectively. Further, 19.20 is a short ring made of a conductive material fitted to the yoke
13.14, and power generation is configured by the pole piece 6 to the shut ring 20. (2) In the
electromagnetic type pink up cartridge of such a structure, if the movable magnet 3 is arranged
in the pole piece assembly having pole pieces 6 to 9 'in the longitudinal direction el, as shown in
FIG. The magnetic paths of the left and right channels are pole piece 6 and yoke 13. Pole piece 7
and pole piece 8. ?????? ??????????? Therefore, the areas and surfaces of the
curved surfaces 6a, 7a, 8a, 9a of the four bundle pieces 6-9. The positional relationship between
the wedges has an important relation to the left and right channoll (1) repulsive voltage 1
frequency characteristics 1 phase characteristics etc. and the channel separation characteristics,
and the pole piece assembly 21v manufacturing method is very inexpensive. It is ? coming. The
conventional method of manufacturing the pole piece assembly 21 will be described with
reference to FIG. 3. First, after the nonmagnetic plate 102 is attached to the bottom of the ferrite
block 101v, the depth reaches the nonmagnetic plate 102, A groove 1031z, 711] having a
cylindrical portion 11 ░ 9] is manufactured, and a first subassembly 107 made of a pole piece
104. 105 and a spacer 106 is manufactured. Apart from this, 72 ferrite plates 108, 109 and
three nonmagnetic plates 110 ░ 111. 112 are alternately bonded, and a wedge 104 having a
semi-cylindrical portion 120 of the same diameter as the semi-cylindrical portion at the center of
the bottom. and prepare a second subassembly 118 consisting of pole pieces 113, 114 and
spacers 115, 116, 117. This second subassembly 118 is fitted in the first subassembly IJ1o7z
groove 103, and the positional relationship between the two is determined based on the pin 121
having substantially the same diameter as the two semi-cylindrical portions 119 and 120. Then,
they are bonded and integrated to produce the pole piece assembly par 122. Then, the pole piece
assembly par 122 is cut to a predetermined thickness. Yoke butt IfI? finish 77111, two semicylindrical parts are formed, and a round hole finish hole is inserted by inserting a vibrator to
complete a pole piece assembly.
However, in the case of the conventional Q manufacturing method described above, a large
number of adhesive layers are present in the manufacture of the fourth subassembly 118, and
the two first subassembly 107 and the second subassembly 118 are interposed. Because there
are subassemblies, there is a separate reference line that determines the position of each pole
piece, and furthermore, there is a tilt between the two subassemblies due to the gap for mating
and bonding the two subassemblies. Due to the occurrence of each pole piece ? the area of the
curved surface in the round hole, and considerable variation in the relative wedge position
relationship? Arise and the result. Unbalance in the output voltage, 1 frequency characteristic, 1
phase characteristic etc. of the left and right channels, and deterioration of the channel
separation characteristic are caused, leading to 1 yield decrease and cost increase. In view of the
above 0 point, the present invention provides a method of manufacturing a pole piece assembly
which has a small number of ridges in processing, less adhesive layers, is simpler than in the
prior art, and can improve dimensional accuracy. Significantly improve the characteristics of
various 1 yield improvement. It greatly contributes to cost reduction. EndPage: 4 or less 1 The
present invention will be described with reference to the drawings of the embodiments. First, as
shown in FIG. 4, the first groove 23 (groove width 2 (a-) e)) is formed at the center of the ferrite
block 22 which has been ground to a predetermined size. The second groove 24.25 of the leftright symmetrical shape and the second groove 24.25 are squeezed at a predetermined position
(a distance 2 (b ? + ? e) between the inner sides of the grooves) of the left-right symmetry. At
this time, the depths of the two second grooves 24.25, and the bottom surface 26. of the ferrite
block 22. J: A's dimension A? Manage with sufficient accuracy. Further, it is necessary to
sufficiently manage the positional accuracy of the three grooves 23.24.25 with respect to the left
and right side surfaces. Furthermore, the diameter of the round hole 39 formed in the post
process? As d, the dimensions a, b and a: Tdsm 22.5 ░ b == ? d cos 22 5 ░ are defined and
processed. и Next, as shown in FIG. 6, three glass plates 27 ░ 28. 29 made of soda-based glass,
which are to be spacers, are -f: n, in each of the 36 grooves 23.24. Insert and bond the gap with
epoxy adhesive. At this time, it is necessary to be careful that the adhesive does not adhere to
both side surfaces 30.31 and the bottom surface 26 of the ferrite block 22. However, in this
process, glass having a relatively low melting point may be melted and filled with the three
grooves 23.24.25i without using an epoxy adhesive.
Next, the ferrite block 222 is divided into two substantially at the center along both sides 31 and each side 31 is joined to the reference plane and the opposite side
is ground until the height reaches a predetermined value BVc. Two blocks half rest 32.33f as
shown in FIG. c make. As described above, if the positional accuracy of the three grooves 23,
24.25 with respect to both side surfaces 31 is managed, the total amount of grinding
allowance is 28 for both halves, and the dimensions in FIG. a and b should be the desired values.
Subsequently, as shown in FIG. 7, at the predetermined position of the bonding surface 34.35 on
the opposite side to the side surfaces 30.31 of the two block half rests 32.33. 7? When
processing the semicircular grooves 36.37'i to be one cylindrical hole in the laminating step, the
positional accuracy of the semicircular grooves 36.37 is determined by the following equation:
Also as A a a. The shape is managed with sufficient accuracy by the shape of the processing
grindstone and the cutting depth. In addition, by this semi-round groove ? ? construction. ??
?????????????? The pole piece 7 and the pole piece 8 are separately formed.
Next, the semi-round groove 36.37 is processed f? The two bonded blocks 32.33i are bonded to
each other with the epoxy adhesive, and after the pole piece assembly par 38 as shown in FIG. 8
is formed, the vibrator is inserted. A desired diameter d is finished by lapping or grinding the
round hole 39 to be formed. In adhesion of the two blocks 32.33, it is necessary to be careful
that the bottom surfaces 26 of the two blocks are adhered without a step and that the adhesive
does not adhere to the bottom surfaces 26. Finally, with the bottom surface 26 as a reference
surface, the top surface 27 opposite to the bottom surface 26 is ground until the height D
becomes D, and then the first groove is inverted 8 again with the top surface 27 as a reference
surface. A bottom surface 26 to a predetermined dimension E which reaches the glass plate 27
which is inserted r L into 23 After the pole piece 7.9 is separated and formed by grinding and
dividing the ferrite portion into two parts, the pole piece assembly par 38 is cut into a
predetermined thickness ? ? ? ? ? B, and the face coupled to the yoke 13.14 is lapped. Thus,
the pole piece assembly 21 shown in FIG. 9 is obtained. Therefore, according to the pole piece
manufacturing method of one embodiment, in the height direction, the reference plane of 710
work? Since all the bottom surfaces 26 are used, the distance XI from the bottom surface 26 of
the finished pole piece assembly to the center of the round hole 39 where the vibrator is to be
inserted is X?C?D + E, which is determined by three dimensional control. Much more accurate
dimensions can be developed compared to conventional manufacturing methods.
Further, also in the lateral direction, since the reference plane of the loach is completely 3 to be
both side surfaces 30 and 31, the lateral accuracy from the center of the circular hole 39 can be
managed with high dimensional accuracy, and each pole piece The lateral position accuracy of
this is the ratio EndPage: 5 to that of the conventional manufacturing method. Also, the
formation of each pole piece is performed not by pasting as in the conventional method but by
dividing or removing by most 1 machine 77El. However, it should be noted that the improvement
in position accuracy is not only improved, but also greatly contributes to the simplification of the
process. In addition, the lateral distribution from the center of the circular hole is such that the
dimensions a and b are a = Tdsm 22.5 ░ b = 7 acos 22.5 ░, and the bottom of the two second
grooves from the center of the circular hole Because the size is smaller than the size of a, the
areas of the curved surfaces of the four pole pieces and the four spacers on the inner
circumferential surface of the circular hole are all equal, resulting in the output voltage and
frequency of the left and right channels. Unbalance in the characteristic 1 phase characteristic
and the like is minimized. -In the above embodiment, the ferrite block is divided once into two,
and after processing the semi-round groove in each, the round hole is formed to form a round
hole, but in addition to this, one nonmagnetic material is filled in the three grooves. It may be a
method of processing a round hole directly after the process. That is, in FIG. 4 of the above
embodiment. a "" 2 dslrl 22-5 b = -7 a cos 22-5 ░-0, and three glass plates like the sixth meat?
After insertion and bonding, the steps corresponding to FIGS. 6 and 7 are omitted, and a round
hole having a diameter d is machined as shown in FIG. The pole piece assembly shown in FIG.
According to this method, advanced technology for round hole 7JO from the point of dimensional
accuracy? Although it is necessary, the number of processes is reduced compared to the above
embodiment, the number of bonding processes is reduced by one, the point that mechanical
strength is increased, and the possibility of more accurate dimensional accuracy. Etc. with many
excellent points. Also, half a block is 3 grooves? A groove is provided in a block to which a
nonmagnetic material is attached on one side in addition to a block having two minutes or more,
and the groove may be obtained by filling the groove with a nonmagnetic material. The magnetic
separation process of the outer two pole pieces can be omitted because the magnetic
reconnection can be achieved by this method. It goes without saying that the holes may be
square holes in addition to the round holes. As described above, according to the manufacturing
method of the pole piece assembly of the present invention, the process is simpler than the
conventional method, and the dimensional accuracy can be made to be the same as that of the
conventional one.
The frequency characteristics, the phase characteristics, the channel separation characteristics,
and other characteristics can be significantly improved, and the yield improvement and cost
reduction can be greatly contributed. The industrial utility value of -f: is extremely large.
4. Brief description of the drawings. FIG. 1 is a perspective view showing an electromagnetic
pickup cartridge, FIG. 2 is an exploded perspective view of the main parts thereof, and FIG. 3 is
used for four electromagnetic type binocular knobs. FIG. 4 is a perspective view showing two
steps of a conventional method of manufacturing a hole piece assembly, and FIG. 4 to FIG. 9 are
perspective views showing one embodiment of a method of manufacturing a pole piece assembly
according to the present invention. ?????????????????????????? 8a,
9a и и и и и и curved, 21 ... first ... pole piece assembly, 22 ..... ferrite block, 23 ... track, the first
groove, 24.25 ..... second Grooves 26 иииииииииииииииииииииииииииииииииииииии Glass plate, 30.31 иии Sides, 32.33 иииииииииии
Block half rest, 34 ░ 35 ░░░ и ░ beams mating surfaces, 36.37 ...... Hanmarumizo. ??
░??????????????????░░ ░? Round hole. Name of agent Attorney
Nakao Toshio Nakao has 1 person EndPage: 6 Fig. 1 I7 Fig. 4 Fig. 6 Fig. 7 EndPage: ?
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