JPS5841415A - Rotary magnetic head device - Google Patents

Abstract

PURPOSE:To determine the relation of position of a plurality of magnetic head simply with high accuracy, by restricting the position of plural rotary magnetic head bodies forming a rotary magnetic head device with grooves. CONSTITUTION:A rotary magnetic head device is formed by laminating and fixing the 1st head body 12 and the 2nd head body 13 on a rotary base 11. The 1st head body 12 is constituted by butting a pair of magnetic head halves 12a, 12b at a gap interval G. An isosceles triangle position restricting groove 24a is formed at the center of butted plane of the half 12a and a square-shaped position restricting groove 25a is formed at a position apart from the center. A semicircle groove 24b is formed at the center of butted plane of the half 12b. The 2nd head body 13 is constituted similarly as the 1st head body. In the head bodies, after the side of the groove 24a is brought into abutment on the rotary shaft and the rotating center position is restricted, the side of the groove 25a is brought into abutment on a position restricting pin 15 for the restriction of position to the rotary base 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a highly practical rotary magnetic head device suitable for use in a segmented helical scanning type video recorder.

Recently, a magnetic tape, which is a recording medium, is run in a diagonal direction with respect to the rotating surface of a rotating magnetic field, and signal tracks and ridges are formed in the diagonal direction of the magnetic tape to record both image signals. A so-called helical scanning type video tape recorder/- (VTR) that performs this has become widely used.

And V'! There is a demand for 'RKs to be smaller and lighter, as well as to be equipped with various functions for fast forward playback, slow motion playback, and still image playback.

However, in a VTR, signal reproduction is generally performed by rotating P to 92 magnets placed at 180 opposing positions and alternately tracing the signal tracks on the magnetic tape. In this case, there was a problem in that deletions occurred during signal deterioration due to a misalignment between the signal track and the trace locus of the magnetic head, resulting in poor quality of the reproduced image.

Therefore, conventionally, as shown in FIG. 1 (1), for example, qY2* is applied to two main magnetic fields on a rotating disk 1.

21 facing each other by 180", and two auxiliary magnetic headers r, 9a, and Jb were installed facing each other by 180" in order to compensate for the omission during signal deterioration, and to these, a wire of 2 m + 2 bt Ja
Playback mi using the playback vTJ line signal obtained from +Jb
This is done to prevent quality deterioration of the magnetic head 2 #2b, 3 that is attached to this rotating disk IK.
M, 3b are magnetic cores 4 which are butted against each other with a predetermined distance between them, as shown in FIG.
&a4b has a structure in which a coil 5 is wound around it, and is attached to the rotating disk 1 in highly accurate alignment.

This high precision is due to the magnetic field of alignment K.

2b, 3&, and Jb should be installed at the same distance t from the center of rotation of the rotating disk 1, and should be positioned so that they are 180 degrees opposite to the center of rotation. Of course, as shown in FIG.
) It is also necessary to accurately regulate the positional relationship with That is, the main magnetic head jm (jb) and the auxiliary magnetic head 3m (
The positional relationship with 3b) is magnetic chi! In relation to the running speed of , and the rotational speed of the rotating disk 1, the distance d1 between both magnetic headers is uniquely determined, and the width of y is 〒
It is necessary to accurately set W and the mounting height h. This installation requires extremely high positional accuracy, within a few micrometers of beak, and requires special jigs and microscope observation, requiring a great deal of time and highly skilled work. Moreover, in recent years, there has been a trend toward miniaturizing the rotation P itself, and reducing the rotation diameter of the magnet to 50-φ or less. However, in order to meet such specifications, it is impossible to simply miniaturize each component, and even more precise positioning work is required, which poses great difficulty in the assembly work of the present invention. was created taking these circumstances into consideration, and its purpose is to easily and accurately determine the positional relationship between multiple magnets and the do, and to easily reduce size and weight. To highly practical rotating magnetism that can be
The objective is to provide a coded device.

The outline of the present invention is to connect the upper half of the body to a pair of magnetic
P body is connected to a plurality of rotating magnetic fields formed by abutting each other at a distance of 180'' and facing each other by 180'' at both ends thereof, and a groove for regulating the center position thereof. The above-mentioned purpose has been effectively achieved by realizing a rotating magnetic field device by regulating the position of the magnets and laminating them coaxially in the direction of the rotating shaft.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIGS. 1(a) and 1(b) are a plan view and a side view showing a schematic configuration of an embodiment device. This device is stacked and fixed on a rotating base II, and a ninth rotating magnetic head body 12 is fixed on a rotating base II. and a second rotating magnetic field, and a do body 13, and the above (b) turning base 1
It has a structure in which the position is regulated with high precision by a rotating shaft 14 and a position regulating pin 15 provided at the center position of 10 rotations. The first and second rotating magnetic heads 12 and 1j have basically the same structure, although there are slight differences.The first rotating magnetic head 12 will now be explained. Then, 12 pieces of the same edge body, a pair of magnetic fields, upper half body 11m, 11b
are arranged against each other at a predetermined distance, f interval G. For magnetism, the upper halves 11m, 12b are made of nine semicircular plates with magnetic body parts 21m, 21b, 22m, :12b, such as ferrite, at both ends between the butts, and the magnetic head half 7ja has magnetic parts 21m, 21b, 22m, :12b, etc. In the vicinity of the abutting open ends of the body portions 211° and 221, there is a groove 11* for winding a coil, which will be described later.
, 23b are provided in the central portion between the butts of the magnetic head halves Jja, and the pinching magnetic body portions 11m, 21! An isosceles triangular position regulating groove 24m is provided at a position equidistant from the tip of the @, and a square position regulating groove 25a is provided at a position away from the center of the abutment surface. Similarly, a semicircular groove 24- is provided in the center between the butts of the other magnetic head half 11-. However, the magnetic head halves 12m and 11b having such a shape are
The first
The center-aligned joining of the two magnetic halves ix and xxb, which constitute the rotating magnetic head body 12, is performed, for example, by lath joining, and in the figure, #1 indicates the lath joining layer. . At both ends of this first rotating magnetic body 12,
The groove 2J is formed in the magnetic head portion formed by joining the magnetic body portions 21m, 21b+12m, and 21b to each other.
Wind the coil 11 through a * 2 j b, and
Two magnetic heads facing each other have been completed.

In other words, these two magnetic fields are integrally formed as a part of the rotating magnetic head body 12, and are 180 degrees opposite to the rotation center of the rotating magnetic head body 12. The rotating shaft 14 is inserted into the hole formed by the opposing grooves 24m and 24b, and each side of the groove 241 is brought into contact with the rotating shaft 14 to regulate the center position. The circular groove j4b has an escape from the rotating shaft 14. This allows for the re-magnetization mentioned above! The de is
They will be positioned at a distance from the center of rotation and at a position opposite by 80 degrees. Note that the groove 25a is formed on the rotary base 1.
1, the position is set by making contact with the position regulation bin IIK.

In addition, the second rotating magnetic head body 13 is also formed with Fc Sakaki in the same manner as the first rotating magnetic head body 12 described above, but the position of the b groove that abuts the position regulating ring 11jlC is different. . In the second rotating magnetic shield body 11, the joining surface of the P half body is the contact surface with the position regulating pin 15, and in order to insert this position regulating pin 15, a semicircular shape is formed on the other half. Relief groove zs
b.

Accordingly, to the Ill and second rotating magnet configured in this way, the half body 12.11 has its central groove passed through the rotating shaft 14, and the groove located away from the center of rotation is connected to the position regulating bin. The 9y body 12.11 is mounted on the rotating base 11 through the IJiK, and the 9y body 12.11 is mounted on the rotating base 11 through the groove 2.
After the 4 m side is placed on the rotating shaft 14' to regulate its rotational center position, the side of the groove 15*, Ilb is brought into contact with the position regulating pin IIK to regulate its position relative to the rotating base JJK. At this time, the groove JJa is provided for regulating the position, and the groove 25b is provided for setting relief. And the groove 25 m s 2 l b is
The depths are different, and the do body 1 is connected to the first rotating magnetism.
The zK is brought into contact with the bottom of the groove 25a, and the second rotating magnetic body 11 is brought into contact with the joint surface of the half body. As a result, the first and second rotating magnetic head bodies 12.13 have their bonding surface directions different from each other by the depth of the groove 21m. Therefore, groove 2
If the depth of 5a is set in advance with high accuracy (predetermined), it will be possible to
The distance between the tips of the tabs and the tips of the tabs is determined with high precision at a predetermined angle of 2°l5ld. Therefore,
In this state, by stacking and fixing the VP body 12 and IJJ to the rotating magnetic base 111F, the P
The device has been completed.

In addition, what is the track width for each magnetic field? , and the distance from the laminated joint surface to the center of the tire width T, the distance b/2
is adjusted by the depth of the cuts provided on both sides of the tip. Further, these cut portions are filled with a wear-resistant material such as Plus.

Thus, according to the magnetic head device having such a structure, the first and second rotating magnets and the magnets formed at both ends of the do bodies 11 and 11 are equidistant from each other with the center of rotation as an axis. They will be provided 180 points opposite each other.

Moreover, the magnetic head formed on the first rotating magnetic edge body 12, P, and the second rotating magnetic edge body 13, both head bodies 11.1M are connected to the position regulating pin 1j.
By making contact with (KX), high-precision positioning is possible (KX), and the object can be placed with high precision in a predetermined positional relationship. Therefore, the entire device has a structure that is positioned with extremely high precision.

Further, according to the present structure, the first and second rotating magnetic head bodies 12 and 11, whose dimensions have been determined with high precision, are connected to the rotating shaft 1.
4 and the position regulating pin 15 as guides, it is possible to sufficiently ensure the specified positioning accuracy.

In this respect, in the case of a magnetic device with a conventional structure, the device had to be individually positioned with high precision in multiple magnetic fields, so it is much easier to assemble the device. Especially since it does not require a microscope or special jigs unlike conventional methods, it is possible to simplify assembly and improve mass production.

Moreover, since this structure incorporates a rotating magnetic field and a magnetic field integrally at both ends of the joined body 12 and 13, it is easy to miniaturize its shape. Rotation diameter t
It is also easy to set it to -50J or less. Therefore, VTR
There are many advantages to this technology, which are extremely effective in reducing the size and weight of the machine.

In addition, regarding the distance relationship between the magnetic head provided on the first rotating magnetic head body 12 and the magnetic head provided on the second rotating magnetic head body 13, which mounting angle is the groove 251, By changing the width and depth of
can be adjusted to Also, for both rotational magnetism, P body 1x
.

The stacking and fixing means of the ZJ can be achieved by various means including screw tightening.

By the way, the device for the embodiment described above is manufactured, for example, in the following manner. FIG. 3 (&) (b) shows an example thereof. First, prepare a P base for rotation consisting of a cylindrical body, and divide it into two to form a semi-cylindrical professional body 31.
The cutting plane of this semi-cylindrical bar 31 is formed into a mirror surface, and a magnetic bar 32 forming a magnetic bar is formed at both end edge portions where the outer peripheral surface and the cutting surface intersect.
Enter the scene. Then, on the cut surface (becoming a joint surface) of this professional body 31, a groove 3J1 for the winding, a center position regulation s14,
In this case, it goes without saying that the center position regulating groove 14 is provided at a distance from both ends of the magnetic rod 320. At the same time, on the joint surface of the block body 31, a plurality of CSIs are attached to the magnetic field to regulate the width of the P.
Each of the above grooves: 13, 14. Provided perpendicularly to JIS.

Afterwards, a pair of professional grooves were made like this,
As shown in FIG. 3(b), the steering bodies 31 and 3 are connected to a predetermined gear, ! They are butted against each other with a gap G between them, and an f2 stick 3B, which is a 2 stick adhesive material, is inserted into the groove, and is heated and melted to join the two professional adhesive bodies 37.3F. After that, it was joined to the 9th Pro! body, V J , J 'I along the broken line in the figure to the disk-shaped rotating magnetism! Cut it as a do body, shape it, wrap a coil around the do part, and as mentioned above (align the ψ do body with multiple rotating magnets and stack and bond them to create a wooden structure. The head device is completed.

In this way, the device for this structure can be manufactured very easily,
It is also very valuable.

In the first production process, the lath adhesive material has a low melting point, but an appropriate number of grooves for inserting the lath rod 38 may be provided depending on the body structure and its size. Of course, it is also possible to construct all of the blocks made of magnetic material and use the tips at both ends as magnets.

Although one embodiment of the present invention has been described above, the present invention is not limited to this.

For example, it is also possible to implement modifications as shown in FIGS. 4(a) and 5(b), and FIGS. 5(a) and (b), respectively.

That is, as shown in FIG. 4(a), the azimuth angles of the magnetic hepts incorporated into the first and second rotating magnet bodies 111 and 11 may be made different (also, the fourth open can). As shown in [It is possible to provide a rotating magnetic head body in three or more layers, it is also possible to change the azomass angle of those magnetic heads, and it is also possible to laminate a rotating magnetic head body in four or more layers. Of course, it is also possible to have such a structure. In addition, fJI
As shown in Fig. c5 (a) K, it may be done by connecting the groove provided on the outer circumferential side of the head body and the position regulating pin z5.Furthermore, the rotating magnetic head body may be placed in the fifth open can). As shown, it can also be constructed from a roughly rectangular piece of magnetic material.
In short, the present invention can be practiced with various modifications without departing from its gist.

As explained above, in the present invention, the upper halves of a pair of magnets are butt-joined with a predetermined gap G between them to form magnetic discs facing both ends of the VCl 30, and a position regulating groove is provided at the center of rotation. To multiple rotating magnetic fields,
The present invention is intended to realize a rotary magnetic field device having a structure in which the field bodies are laminated coaxially with their positions regulated by the grooves. Therefore,
The positional relationship between each magnetic field and the magnetic field can be determined easily and with high precision, and the size can be reduced. Moreover, it has great effects such as simplifying manufacturing and significantly improving mass productivity, and has great practical effects.

[Brief explanation of the drawing]

#! Figures 1 (a) to (@) are diagrams for explaining the outline of the conventional structure head and its problems, and Figure 2 (&) 传)F! , A plan view and a side view showing the configuration of an apparatus according to an embodiment of the present invention, FIG. (b) and Figure 5(a) (
b) is a diagram showing an example of a convenient form of the present invention. 11... @ Vehicle base, xx, is... times @ Magnetic head body, 14- Rotation axis, 15... Position regulating pin, 16-
-Glass adhesive layer, 17...Coil, 12a. x z b-・to magnetism, y half body, 21*, 11b. 21m, 21b--magnetic body part, 23a, 23b
-=groove, 14 m, 24 b, j la
, j j b ---Position regulation groove O Applicant's attorney Takehiko Suzue Figure 1-2 (c) Figure 2

Claims (1)

[Claims] A pair of magnetic plates each having a magnetic body part provided at both ends of the magnetic plate are abutted against each other at a predetermined gear dub interval to form two magnetic heads facing each other at 180 degrees at both ends.
To the above magnetism, to the above two magnetisms on the abutting surface of the P half body, to both magnetisms on the straight line connecting C, a groove is provided at a position equidistant from C to the rotation center axis and to regulate the rotation center position. To multiple rotating magnetism! A rotating magnetic device characterized in that the magnetic field body is positionally regulated by the groove and coaxially arranged in the direction of the rotational axis (layered in layers).