JPS62208401A - Vertical magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To execute recording with a high density by constituting the titled device so that a vertical magnetic recording medium can be run along the outside peripheral surface of both a rotary cylinder and a fixed cylinder, and recording and reproduction can be executed from only one side of the vertical magnetic recording medium. CONSTITUTION:Main magnetic poles 12, 12' which have been formed by a high magnetic permeability thin film are placed on the outside peripheral surface of a rotary cylinder 11 which has been constituted of a nonmagnetic material. In the inside of a fixed cylinder 13 in which the vicinity on which a vertical magnetic recording medium 14 abuts or the whole has been formed by a magnetic material, magnetic core 16 for refluxing a magnetic flux to which an excitation winding 15 has been performed is formed integrally or by joining it. The vertical magnetic recording medium 14 is subjected to a position control by a lead part 18, wound obliquely to the side face of the rotary and fixed cylinders 11, 13 and runs. By a rotation of the rotary cylinder 11, the main magnetic poles 12, 12' contact the vertical magnetic recording medium 14 and form an oblique track, and a magnetic flux which has been generated in the winding 15 passes through a magnetic path 17, and a recording magnetization is left on the oblique track. Reproduction of a signal is executed by following a process reverse to that of the time of recording. In this way, recording can be executed with a high density.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perpendicular magnetic recording and reproducing device, and particularly to a perpendicular magnetic recording and reproducing device suitable for use in a video tape recorder and the like.

[Conventional technology]

Conventional magnetic recording and reproducing devices have used a blast recording method using a ring-shaped magnetic head and a longitudinal recording medium.
With the recent trend toward higher density recording, perpendicular magnetic recording methods, which are capable of higher density recording than blast recording methods, have been attracting attention. For example, JP-A-53-32
There is a publication No. 009.

It is known that in the revised magnetic recording system, the demagnetization effect decreases as the recording density increases.

Suitable for high-density recording.

゛ Fig. 5 is a principle diagram of the perpendicular magnetic recording system, in which the main magnetic pole 51 is made of a high magnetic permeability film. A sub-magnetic pole consisting of a ferromagnetic core 52 and a winding 53 are arranged to face each other, and a perpendicular magnetic recording medium 54 is sandwiched between the two magnetic poles so as to run in contact with the tip of the main pole. The operating principle at this time is as follows. That is, by passing a signal current through the excitation winding 1lA53, a magnetic flux corresponding to the input signal is generated from the sub magnetic pole, and after passing this magnetic flux through the perpendicular magnetic recording medium 54, the main magnetic pole 51
The recording magnetization 55 is made to remain perpendicular to the film surface of the perpendicular magnetic recording medium 54. According to this method,
Even if adjacent residual magnetizations become high in density, they do not weaken each other and remain stable, making high-density recording possible.

By the way, for the above reasons, it is expected that if the perpendicular magnetic recording method is applied to a rotating head cylinder, it will be possible to realize a device capable of even higher density recording. It is proposed by the publication no. An example of this is shown in FIG. FIG. 6(a) shows main magnetic poles 62a and 63a on the outer peripheral surface of the rotating cylinder 618.
A sub magnetic pole tf! is provided so as to face the main magnetic poles 6S'a, 63a across the tape-shaped perpendicular magnetic recording medium 64a. 6
．． 5a is arranged. The perpendicular magnetic recording medium 64a is wound diagonally five times around a rotary cylinder 61a and a fixed cylinder 67a to form a diagonal track 66a, and its position in the tape width direction is regulated by a lead portion 68a provided at the bottom of the fixed cylinder 67a. while driving. Also.

FIG. 6(b) shows a main magnetic pole 62b in order to solve various problems caused by the non-linearity of the lead portion 68b.

Rotating cylinder 6 in which 63b is formed in a spiral shape
A perpendicular magnetic recording medium 64b is wound in parallel around 1b, and a diagonal track 66b is formed.

A sub-magnetic pole 65b in the form of a thin plate is arranged to face the main magnetic poles 62b and 63b at a predetermined angle θ with respect to the cylinder rotation surface. Both of the above examples have the advantage that they can be applied to a rotary head cylinder of a perpendicular magnetic recording system and that a rotary transformer can be omitted. Naa,
69a and 69b are excitation windings wound around the sub magnetic poles 65a and 65b, respectively.

However, in FIG. 6(a), (i) the sub magnetic pole 65a is outside the rotating cylinder 61a, and the main magnetic pole 16
Since all of the opposing surfaces of 2a and 63a in contact with the perpendicular magnetic recording medium 64a must be covered by the sub magnetic pole 65a, the shape becomes large.

(if) Since there is no magnetic pole for magnetic flux circulation, the recording and reproducing efficiency is not very good. (leg) Usually, the main magnetic pole is 62a.

63a, and the perpendicular magnetic recording medium 64a is wound around the rotating cylinder 61a at an angle of 180' or more.
Depending on the rotation angle, a plurality of main magnetic poles 62a and 63a may contact the perpendicular magnetic recording medium 64a at the same time.
In this case, recording is performed separately by each main magnetic pole 62a, 63□a.

Although it is desirable that it be reproduced, it has disadvantages such as difficulty in doing so.
(iv) Since the spiral main magnetic poles 62 & 63b have no edges in the track width direction, it is difficult to generate a steep perpendicular magnetic field, and the track width cannot be defined accurately. V) Spiral-shaped main magnetic poles 62b and 63b have the disadvantage that they are not very practical in terms of securing uniformity of film thickness and production costs.

[Problem that the invention seeks to solve]

As described above, according to the prior art, the shape becomes large. Recording and playback efficiency is not very good. There are drawbacks such as the difficulty of recording and reproducing information separately using each main magnetic pole.Furthermore, when a spiral main magnetic pole is used, it is not possible to accurately define the Nidrack width, and it is not easy to ensure uniformity of film thickness. There were problems such as:

SUMMARY OF THE INVENTION An object of the present invention is to provide a perpendicular magnetic recording/reproducing apparatus which eliminates the above-mentioned drawbacks of the prior art and is capable of high-density recording.

[Means for solving problems]

The present invention comprises a rotary head cylinder having a drum-shaped rotary cylinder and a fixed cylinder, at least one main magnetic pole is formed on the outer peripheral surface of the rotary cylinder, and at least a portion of the fixed cylinder is provided with a magnetic flux having an excitation winding. In order to solve the above problem, the perpendicular magnetic recording medium is made to run along the outer circumferential surfaces of both the rotary cylinder and the fixed cylinder using a circulating magnetic core, so that recording and reproduction can be performed from only one side of the perpendicular magnetic recording medium. did.

[Effect]

At least a portion of the stationary cylinder is made into a magnetic core for magnetic flux circulation, and a linkage magnetic path is formed with the main magnetic pole inside the rotary head cylinder, making it possible to downsize the cylinder and forming a closed magnetic path. The recording and reproducing efficiency is improved, and when a plurality of main magnetic poles are provided, recording and reproducing can be performed separately on the main magnetic poles.

〔Example〕

The present invention will be explained in detail below using the embodiments shown in FIGS. 1 to 4.

FIG. 1 is a configuration diagram showing an embodiment of the perpendicular magnetic recording/reproducing apparatus of the present invention, FIG. 1(a) is a perspective view, and FIG. 1(b) is a first embodiment.
FIG. 3 is a cross-sectional view taken along line AA' in FIG. In order to make the inside of the cylinder easier to understand, in FIG. 1(a), the magnetic recording medium is shown separated from the side surface of the cylinder, and the rotating cylinder is shown shifted upward from the fixed cylinder along the rotation axis.

In FIG. 1, reference numeral 11 denotes a rotating cylinder made of a non-magnetic material, and a main magnetic pole 12, 12' made of a high magnetic permeability thin film is arranged on the outer peripheral surface of the cylinder. Reference numeral 13 denotes a fixed cylinder in which only or all of the vicinity of which the perpendicular magnetic recording medium 14 comes into contact is formed of a magnetic material (for example, a ferrite core), and a rail-shaped magnetic flux circulation core 16 with an excitation winding 15 inside is formed. It is formed integrally with or joined to the fixed cylinder 13, forms a part of the magnetic flux return magnetic path 17, and also writes and reads signals. The tape-shaped perpendicular magnetic recording medium 14 travels while being regulated in position in the tape width direction by the lead portion 18, making one rotation and being wound diagonally around the side surface of the fixed cylinder 11, 13.

Next, the operation will be explained. When the rotary cylinder 11 rotates, the main magnetic pole 12.12' rotates against the perpendicular magnetic recording medium 14.
It forms a diagonal track while contacting with, but at this time,
The magnetic flux generated by passing a signal current through the winding 15 passes through the magnetic path 17 and leaves recorded magnetization on the diagonal track. Reproduction of a signal is performed by following the reverse process to that during recording.

In the embodiment shown in FIG. 1, the secondary pole, ie.

Since the magnetic core 16 is located inside the fixed cylinder 13, it can be constructed compactly, and since a closed magnetic path is formed, recording efficiency is high, and a rotary transformer is not required.

By the way, the rotating cylinder 11 has a plurality of main magnetic poles 12.
12', it is desirable that recording and reproduction be performed separately by each main pole, and for this purpose a configuration as shown in FIG. 2 may be used. FIG. 2 is a configuration diagram corresponding to FIG. 1 showing another embodiment of the present invention,
(a) is a perspective view.

(b) is a sectional view taken along the line BB' in (a). This is the rail-shaped magnetic core 2 with the winding described in FIG.
6.26' for one rotation Main magnetic pole 22.2 of cylinder 21
The magnetic poles 2' are sequentially added to the inside of the fixed cylinder 23 according to the number of magnetic poles 2', and a magnetic linkage path is formed only with a desired main magnetic pole. Here, the main magnetic pole 1, for example, the main magnetic pole 22', which forms an interlinking magnetic path with the inner rail-shaped magnetic core 26', is connected to the outer rail-shaped magnetic core, for example, the magnetic winding 25'.
It is necessary to make a notch 22" that straddles the magnetic core 26 so that it does not interlink with the magnetic path 27 formed by the magnetic coil 26. In this case, the excitation winding provided near the innermost circumference A rail-shaped magnetic core 26 with wires 25'
The magnetic path 27' formed by the fixed cylinder 23 becomes longer and there is a risk of an increase in magnetic resistance.To avoid this, in FIG. 2(b), replace the fixed cylinder with another fixed cylinder. Fixed cylinder 2 with 23 in the center
3 and the reflective side to form a magnetic path similar to that of the fixed cylinder 23, and halve the number of rail-shaped magnetic cores in one fixed cylinder.

With the above structure, even if a plurality of main magnetic poles come into contact with the perpendicular magnetic recording medium 14 at the same time, each magnetic path and excitation winding are different, so recording can be performed separately.

Can be played.

Next, still another embodiment of the present invention will be described using FIG. 3. FIG. 3 is a block diagram showing still another embodiment of the present invention, (a) is a perspective view of a fixed cylinder, (b) is a
) is a sectional view taken along line c-c'.

In the third ml, 31 is a rotating cylinder, 32 is a main magnetic pole, 33 is a rotating cylinder, 14 is a perpendicular magnetic recording medium,
35 is an excitation winding, 36. 37 is a magnetic core for magnetic flux circulation provided with an excitation winding 35, and 37 is a magnetic path that rotates once and is the main magnetic pole 32 of the cylinder 31. Portions other than the auxiliary core 39°3.9' are omitted from illustration.

First, the structure will be explained. Inside the fixed cylinder 33 made of a non-magnetic material, two rail-shaped magnetic cores 36 for magnetic flux circulation are arranged, which are magnetically coupled and provided with excitation windings 35 for recording and reproducing. There is. On the outer peripheral surface of the rotating cylinder 31, a magnetic auxiliary core 39.39'' is arranged so as to cover the main magnetic pole 32 and the vicinity of the main magnetic pole 32 so as to be in contact with the perpendicular magnetic recording medium 14.The main magnetic pole 3
Only one rail-shaped magnetic core of the two rail-shaped magnetic flux circulation magnetic cores 36 faces the side opposite to the side in contact with the perpendicular magnetic recording medium 14 and the auxiliary core 39 . The structure is such that only the other rail-shaped magnetic core of the magnetic core 36 faces the side opposite to the side in contact with the perpendicular magnetic recording medium 14 of .39', and the main magnetic pole 3
2 → Recording medium 14 → Auxiliary cores 39, 39' → One rail-shaped magnetic core → The other rail-shaped magnetic core → Main magnetic pole 3
A closed magnetic path 37 extending over two is formed.

Next, the magnetic flux generated by passing a signal current through the first winding 35, which will explain the principle of operation, passes through the magnetic path 37,
Recorded magnetization is left in the perpendicular magnetic recording medium 14 at the tip of the main magnetic pole 32, but at this time, as the cylinder 31 rotates once, the main magnetic pole 32 and the auxiliary core 39, 39' are also integrated to form the linkage magnetic path 37. Rotate while keeping the recording track 40
form. Reproducing a signal is performed by following the reverse process of recording. According to the embodiment shown in FIG. 3, in addition to the advantages of the embodiments shown in FIGS.
The perpendicular magnetic field in the recording medium 14 is
This solves the problem of a tendency to tilt to the 3rd side.

Although the effectiveness of the present invention has been explained using the three embodiments above, in order to make the device even more efficient in recording and reproducing,
It is desirable to take the following measures.

That is, a rail-shaped magnetic core 4, for example, FIG.
) It is not a good idea to provide the winding ↓5 all over the side surface of the rail-shaped magnetic core 16.

The reason for this is that the magnetic core 16 and winding 15 located far away from the main magnetic pole 12.1♀'' hardly contribute to recording and reproduction, but rather increase the inductance and DC resistance of the winding 15, and the main magnetic pole This is because it becomes a cause of crosstalk between 12 and 12''5, which can be solved by using a structure as shown in FIG.

FIG. 4 is a perspective view showing still another embodiment of the inside of the fixed cylinder of the perpendicular magnetic recording device of the present invention, in which a plurality of independent excitation windings 45a are arranged on the side surface of a rail-shaped magnetic core 46 in the fixed cylinder 43. , 45b.

45c, 45d, 45e, 45f are applied.

One or more excitation windings near the main pole 42.

For example, recording using only the excitation windings 45c, 45d,
The other excitation windings 45a, 45b, 45e
, 45f are short-circuited, and a selection switch (not shown) is operated in sequence. 14 is a perpendicular magnetic recording medium;
47 is a magnetic path, and 50 is a recording track. With such a structure, the inductance and DC resistance per winding can be reduced, and the crosstalk between the main magnetic poles can also be reduced. Furthermore, it becomes possible to provide the rail-shaped magnetic core 46 all around the inside of the fixed cylinder 43,
By wrapping the perpendicular magnetic recording medium 14 around the cylinder to nearly 360 degrees, the cylinder's front diameter can be made smaller than in the past. Of course, it is clear that the present invention is capable of azimuth recording, which has been widely used in the past, and special playback by mounting multiple heads, and the conventional manufacturing technology and signal processing technology can be used as is, making it practical. is high.

〔Effect of the invention〕

As explained above, according to the present invention, the shape of the rotating magnetic head cylinder used in the conventional perpendicular magnetic recording system is increased, and the recording and reproducing efficiency is not very good. It has the advantage of eliminating drawbacks such as difficulty in recording and reproducing, and enables high-density recording.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the perpendicular magnetic recording/reproducing apparatus of the present invention, FIG. 2 is a block diagram corresponding to FIG. 1 showing another embodiment of the present invention, and FIG. FIG. 4 is a perspective view of the inside of the fixed cylinder showing still another embodiment of the present invention; FIG.
This figure is a principle diagram of a perpendicular magnetic recording system, and FIG. 6 is a perspective view of a conventional perpendicular magnetic recording/reproducing apparatus. [Explanation of symbols] 11.21, 31.4-1...Rotating cylinder,
12.12', 22.22', 32.42...main magnetic pole. 13.23, 33.43... Fixed cylinder. 14... Perpendicular magnetic recording medium, 15, 25.25'
35, 45 a to 45 f - excitation winding, 16
,26°26' 36.46...Magnetic core for magnetic flux circulation, 17°27.27',37.47...Magnetic path,
18, 28...Lead part, 39.39'...
Auxiliary core, 40°50...recording track 1°...

Claims (1)

[Claims] 1. A rotary head cylinder having a drum-shaped rotating cylinder and a drum-shaped fixed cylinder, and at least one main magnetic pole is formed on the outer peripheral surface of the rotating cylinder,
At least a portion of the fixed cylinder is a magnetic core for magnetic flux circulation provided with an excitation winding, and a perpendicular magnetic recording medium is made to run along the outer peripheral surfaces of both the rotary cylinder and the fixed cylinder, and only one side of the perpendicular magnetic recording medium is provided. What is claimed is: 1. A perpendicular magnetic recording/reproducing device characterized by having a configuration capable of recording and reproducing data from and from the source. 2. Perpendicular magnetic recording according to claim 1, wherein the magnetic flux return magnetic core has a core surface formed to face a side opposite to a side of the main pole that faces the recording medium. playback device. 3. Claim 1 or 2, wherein the main magnetic pole is one, and magnetic auxiliary cores are arranged on both sides near the main magnetic pole.
The perpendicular magnetic recording and reproducing apparatus described in 2. 4. The magnetic core for magnetic flux return is provided with a plurality of independent excitation windings, and includes selection means for sequentially selecting at least one of the windings near the main magnetic pole. The perpendicular magnetic recording and reproducing device according to item 1, item 2, or item 3.