JPS6028002A - Vertical magnetic recorder - Google Patents

Abstract

PURPOSE:To perform recording/reproducing with high efficiency by providing signal windings to the 2nd and 3rd magnetic poles and securing a differential connection between these two magnetic poles to carry out writing/reading. CONSTITUTION:The recording and reproducing coils 61 and 62 are wound around the 2nd and 3rd magnetic poles 53 and 55 respectively and connected in series. The electromagnetic windings 71 and 72 produce the magnetic fields of the same direction at both poles 53 and 55 to produce a closed magnetic field 9. The magnetic fields produced by both windings are set opposite to each other at a main magnetic pole 51 and therefore offset with each other. Thus the pole 51 is not magnetized. As a result, the tips 54 and 56 of the pole 51 attract a recording medium 1 to have a contact or approximation. In such a way, the contact between the medium 1 and a head can be freely controlled. Thus the recording and reproducing are performed with high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an improvement of a helad load mechanism of a perpendicular magnetic recording device.

[Prior art]

The head loading mechanism in conventional horizontal magnetic recording type floppy disk drives often uses a plunger, solenoid, or the like to bring the entire head into contact with and press against the recording medium. In this case, in order to make uniform contact between the head and the recording medium, the pressure is applied with a strong force, which causes the problem of severe wear on the head and the recording medium.
In addition, abrasion caused by hitting the head (tap abrasion) also poses a problem. Therefore, the base of the recording medium needs to be made of a thick and durable material, and the magnetic recording surface also needs to be constructed to be resistant to wear. There are also problems with the response time when turning the plunger solenoid on and off, velvet/unload, and damping characteristics (such as not making smooth contact during loading).

Figure 1 is an explanatory diagram of the principle of the perpendicular magnetic recording method, which has recently attracted attention as a high-density magnetic recording method.The recording medium 1 is a high-permeability horizontal magnetized material such as permalloy on a paste 11 (polyester film, etc.). It consists of a film 12 and a perpendicular magnetization film 13 having perpendicular magnetic anisotropy such as C8-〇r on top of the film 12, which passes through the base 11 as shown by the arrow. generate a magnetic field,
The perpendicular magnetization film 13 is magnetized in the thickness direction. In reading, the main magnetic pole is magnetized by the perpendicular magnetization recorded on the medium, and this is detected from the coil 3 at the auxiliary magnetic pole 2. In a perpendicular magnetic recording device with such a configuration, the drawload mechanism is conventionally operated from the opposite side of the recording medium, for example, by providing a pad at the tip of the auxiliary magnetic pole 2 and pressing it toward the main magnetic pole as shown in FIG. In general, the cross-sectional area of the main magnetic pole 4 is small and the contact area of the auxiliary magnetic pole with the recording medium is very large, so that the contact pressure of the recording medium contact surface becomes extremely large on the main magnetic pole side. As a result, problems such as the recording medium rotating at high speed being damaged by the main pole, uneven rotation, and difficulty in achieving smooth contact occur. This problem arises because the cross-sectional area of the main pole is small.
This phenomenon occurs not only in the above-mentioned auxiliary pole excitation type head but also in other types of perpendicular magnetization heads, such as the main pole excitation type head described later.

In the case of the above-mentioned auxiliary magnetic pole excitation type head, in order to reduce recording loss and perform efficient recording and reproduction, the recording medium must be in contact with the main magnetic pole with appropriate contact pressure, and the auxiliary magnetic pole must maintain a small gear or gap. It is necessary to adopt a configuration such as this, or a configuration that does not require pressing the main magnetic pole from the opposite side.

However, this was difficult to achieve using conventional means.

[Purpose of the invention]

The present invention has been made to solve the above problems, and provides a head loading mechanism that can freely control the contact between the recording medium and the head, allows efficient recording and playback, and does not damage the recording medium or the head. The purpose is to realize a perpendicular magnetic recording device with

[Summary of the invention]

According to the present invention, at the perpendicular magnetic recording value fπ, the tips of the plurality of magnetic poles of the magnetic body face the running path of the perpendicular recording medium.
The first magnetic pole is arranged in close proximity to each other and forms a closed magnetic path together with the perpendicularly magnetized film and the horizontally magnetized film in the perpendicular recording medium, and the surface facing the recording medium is narrowly shaped so that the magnetic flux density at the tip of the first magnetic pole is high. , second magnetic poles located on both sides of the first magnetic pole tip.
．． The surface facing the recording medium is made sufficiently wide so that the magnetic flux density at the tip of the third magnetic pole is low, and the M2. Third
An electromagnet winding is provided on each of the magnetic poles of the second . The perpendicular recording medium and the first magnetic pole tip are brought into close proximity or in contact with each other by an attractive force generated at the tip of the fifth magnetic pole, and the second magnetic pole
．． The above object is achieved by providing a signal winding on each of the third magnetic poles, and differentially connecting these two signal windings to write and read the perpendicular recording medium through the first magnetic pole. can.

〔Example〕

The present invention will be described in detail below using the drawings.

FIG. 2 is a configuration explanatory diagram showing one embodiment of the helad load mechanism of the perpendicular magnetic recording apparatus according to the present invention.

□ The same parts as in Figure 1 are given the same numbers and the explanation is omitted. 5 is a magnetic material, and 51 is a second and third magnetic pole whose surface facing the recording medium is widened so that the magnetic flux density is high at the tip 52VC and the magnetic flux density is low at the recording medium. 61.62 is Mae Kimiki's second place. Fifth magnetic pole 53.55
The recording/reproducing coils N 63 and 64, which are respectively wound around and connected in series, are input/output terminals for outputting the recording signal ≠ the recording signal or the reproduction signal. Electromagnet windings 71 and 72 are electromagnet excitation windings 73 and 74 that are equally wound around the 21st and third magnetic poles 53 and 55 and coupled in series with each other, respectively.
is established at the excitation terminal of the electromagnet winding 7. Reference numeral 8 denotes an excitation circuit that normally excites the electromagnet winding 7 with direct current in response to a control signal e from a control circuit or the like. The tip 52 of the main pole 51 of the magnetic body 5 is connected to the flap 2. Tip 5 of third magnetic pole 53.55
4.56 or slightly protruding.

In this way, in the de-loading mechanism that was created,
In response to the control signal e, the excitation circuit 8 generates a magnetic field in the direction in which it outputs excitation output, and as a result, a closed magnetic field 9 is formed in the direction of magnetic pole 53 → vertical magnetization film 13 → horizontal magnetization film 12 → vertical magnetization film 13 → magnetic pole 55. . The magnetic fields generated in the windings 71 and 72 are in opposite directions and cancel each other out in the main magnetic pole 51, so that the main magnetic pole 51 is not magnetized.

As a result, the tips 54 and 56 of the magnetic poles attract the recording medium 1 and bring it into contact with or approach, so that the recording medium 1 can be brought into contact with or close to the tip 52 of the main magnetic pole 51. If a recording signal is applied to the terminals 63 and 64 in this state, the winding 61.
62 generate magnetic fields in mutually opposite directions (CvJ & poles 53, 55), and form a magnetic field 22 in the magnetic pole 53→perpendicular magnetization film 13→Eihei magnetization film 12→perpendicular magnetization film 13→main magnetic pole 51→magnetic pole 53. In the closed magnetic field 21 and 22, the open magnetic field is added to the part of the perpendicularly magnetized film facing the tip 52 of the main pole 51, and since the area facing the medium is narrow, the magnetic flux density is high, and recording is performed in this part. 0 The total attractive force F generated by the electromagnet winding 7 at this time is approximately expressed as follows.

B The closed magnetic field 9 magnetized by the second winding 7, Gap facing both pole tips 54.56 magnetic flux density at

S: Cross-sectional area of each gap) 'O' The magnetic permeability of air, that is, the attractive force F is the product of the cross-sectional area S and the square of the magnetic flux density B. If the magnetic flux density Bt is set to a large value, the magnetic flux density Bt can be reduced to a negligible level compared to the magnetic flux density due to the main magnetic pole 51.
The magnetization characteristics of have hysteresis, and at a certain level (
Unless a magnetic flux density higher than the saturation magnetization force is applied, the recording power due to residual magnetization will not be achieved. Therefore, if the magnetic velocity density B is kept below this level, in the gap,
There is no fear that the contents of the recording medium 1 will be erroneously rewritten.

FIG. 3 is a configuration explanatory diagram showing an application example that is a more practical configuration of the above embodiment, in which the magnetic material 5. 'Electromagnet winding @ 71.
72, signal windings 61 and 62 are integrated into one body with a non-magnetic holder (epoxy or the like) 14. Magnetic pole tip 54
．． It is also possible to provide a non-magnetic film on the magnetic pole 56 to make the magnetic field 9 uniform at the tip of the magnetic pole.

In addition, it is also possible to apply it to thin film heads using the film technology.

According to a structure similar to the above-mentioned embodiments, there are many advantages as follows.

That is, by controlling the direct current flowing through the electromagnet coil, the contact pressure between the main magnetic pole and the recording medium can be accurately controlled. Therefore, the gap between the recording medium and the main magnetic pole can be made sufficiently small, resulting in good recording and reproducing efficiency. Furthermore, since an appropriate contact pressure can be obtained, there is no possibility of uneven running speed or damage to the recording medium.

Furthermore, existing two-layer media for perpendicular recording can be used as is.

In addition, the cross-sectional area of the main pole is very small, and as a result,
Since the cross section of the magnetic material for the electromagnet can also be made relatively small, the entire company can be made much smaller than the conventional solenoid system.

Also, unlike the conventional herad load mechanism, w1 does not occur during noise.

It also has excellent response speed when loading/unloading.

Furthermore, by appropriately configuring the excitation circuit of the electromagnet, it is possible to provide optimum damping characteristics, and, for example, it is possible to easily realize a soft landing through speed control.□Therefore, wear caused by hitting the head can also be reduced.

Furthermore, since the pad is in contact with one side, there is sufficient strength in terms of strength even if the thickness of the recording medium is made thinner, which also reduces the cost of the recording medium and improves recording and reproducing characteristics.

Also, since the signal windings 61 and 62 are differentially connected,
Incoming from outside (usually in phase) l! conductive noise is canceled,
Recording and playback can be performed with good noise resistance.

Furthermore, since the head and head loading mechanism are integrated on one side of the medium, it is suitable for double-sided recording and playback.

In each of the embodiments described above, the head #Il is fixed and sucks the recording medium, but it may be configured so that the head #Il moves toward the recording medium.

〔Effect of the invention〕

As described above, according to the present invention, perpendicular magnetic recording has a head loading mechanism that allows free control of the contact between the recording medium and the head, enables efficient recording and reproduction, and prevents damage to the recording medium and the head. The device can be realized with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the principle of a conventional auxiliary magnetic pole excitation type vertical head, FIG. 2 is a configuration diagram showing an embodiment of the present invention, and FIG. 5 is a configuration diagram illustrating an application example of FIG. 2. . DESCRIPTION OF SYMBOLS 1... Perpendicular recording medium, 5... Magnetic material, 12... Horizontal magnetization film, 13... Vertical magnetization film, 51... First magnetic pole, 53... Second magnetic pole, 55 ...Third magnetic pole, 5
2.54.56...Magnetic pole tip, 61.62...Signal winding, 71.72・' magnet winding 1;! .゛・-n 1st Nippon Seki 2nd J Liu

Claims (1)

[Claims] The tips of a plurality of V & poles of magnetic material are arranged opposite to and close to the running path of the perpendicular recording medium, and the tips of the magnetic poles are arranged on both sides of the closed magnetic pole tips together with the perpendicularly magnetized film and the horizontally magnetized film in the medium. The second location. In order to reduce the magnetic flux density at the tip of the fifth magnetic pole, the surface facing the recording fiber is made sufficiently wide, and the chain 2. An electromagnet winding is provided on each of the magnetic poles of the flute 3, and these two electromagnet windings are excited in the same direction to generate the second
．． The perpendicular recording medium and the first magnetic pole tip are brought into close proximity or in contact with each other by the attractive force generated at the tip of the third magnetic pole, and signal windings are provided on each of the 21st and 5th magnetic poles, and these two A perpendicular magnetic recording device in which signal windings are differentially connected to perform writing and reading on the perpendicular recording medium via the first magnetic pole.