JPS605465A - Vertical magnetic recorder - Google Patents

Abstract

PURPOSE:To control freely the contact between a vertical recording medium and a head and to assure the record/reproduction with high efficiency without causing any damage to the recording medium and the head, by using the attraction power of a U-shaped electromagnet to allow the recording medium to come near to or bring it into contact with a main magnetic pole. CONSTITUTION:The magnetic pole ends 61 and 62 of a U-shaped electromagnet 6 are set close to each other on the surface of a vertically magnetized film 13 of a recording medium 1. This magnet 6 contains a U-shaped magnetic matter 7 and an energizing coil 8 which is wound round the matter 7. The attraction force F is equal to the square product of the sectional area S and the magnetic flux density B. If the area S is set much larger than the sectional area of a main magnetic pole 4, the attraction force of a desired level is obtained. At the same time, the density B can be reduced down to such a level that can be neglected in comparison with the density of magnetic flux. Furthermore, the characteristics of magnetization of a vertically magnetized film 13 has hysteresis, therefore the recording using the residual magnetization is impossible unless the magnetic flux density higher than a certain level is applied. Therefore, the contents of the medium 1 are not rewritten by mistake as long as the density B is kept under said level.

Description

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

[Prior art]

In conventional horizontal magnetic recording type floppy disk drives, head loading machines often use plungers, solenoids, etc., 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 self-recording member, a strong force is applied, which causes a 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. For this reason, the base of the recording medium needs to be made of a durable material, and the magnetic recording surface is also resistant to wear (N
It is necessary to achieve this goal. There are also problems with the response time and damping characteristics (such as not making smooth contact during loading) when loading/unloading the head by turning on and off the plunger solenoid.

Figure 41 explains the principle of the perpendicular magnetic recording device, which has recently become a high-density magnetic recording system and has been attracting a lot of attention 1! -'1, as a recording medium 1, a base 11 (such as polyester deno 1 film) is provided with a horizontally magnetized film 12 of high magnetic permeability such as permalloy, and a perpendicular magnetic film 12 such as C-c on top of that. The so-called 21-symbol consisting of the perpendicular magnetization trace 13 with direction; j
A medium is commonly used. Figure 1 is an example of the Urasuke magnetic pole excitation type, with auxiliary magnetic pole 2 (, +4 added to the winding 5, L 1 + 4 by the 1 bar number, main magnetic pole 4 - vertical magnetization film 13 - horizontal magnetization) 12, a magnetic field is generated that passes through the base 11 in the direction of the arrow, and the reassembled 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 it is passed to the auxiliary magnetic pole 2 - [J5 is output from the coil 3.

In such a 1□・I vertical (111 air recording device), the head load lF44'Pt is recorded as in the conventional case.
i 7% From the opposite side of the body, for example in Figure 1; 1h If you put a pad on the tip of the auxiliary magnetic pole 2 and press it towards the main pole, then the cross-sectional area of the main magnetic pole 4 will be small and the auxiliary magnetic pole will be small. Since the contact area of the magnetic pole with the recording medium is very large, the contact pressure on the recording medium contact surface becomes extremely large.As a result, the recording medium rotating at high speed is falsely attached by the main magnetic pole. , rotational unevenness occurs, smooth contact cannot be obtained, etc. Such problems occur not only with the above-mentioned auxiliary magnetic pole excitation type heads but also with the Vertical tampering head (411)
For example, 161 (occurs on the hand) also in 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 the narrow loss and perform recording and reproduction efficiently, the recording medium should be in contact with the main magnetic pole with an appropriate contact pressure, and the auxiliary magnetic pole should be in contact with the main magnetic pole with an appropriate contact pressure, as shown in Figure 2. In order to reduce wear, it is necessary to maintain the minute gears and wheels (5 is the support member). However, for this purpose, the contact pressure between the recording medium and the main pole must be delicately controlled, which is extremely difficult with conventional means.

[Purpose of the invention]

The present invention has been made in order to solve the above-mentioned problems. It is possible to freely control the contact between the recording medium and the head (C), and to enable efficient recording and reproduction. The aim is to realize a perpendicular magnetic recording device that is less susceptible to damage.

[Summary of the invention]

According to the present invention, in a perpendicular magnetic recording device A, both magnetic poles of a U-shaped electromagnet are arranged on the same side as the main magnetic pole close to the running path of the perpendicular recording medium, and the horizontally magnetized film in the perpendicular recording medium The above object can be achieved by forming a closed magnetic path with the perpendicular magnetization film and the U-shaped a magnet, and bringing the perpendicular recording medium and the main magnetic pole close to or in contact with each other by the attractive force of the U-shaped electromagnet. .

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

FIG. 5 shows an embodiment of a perpendicular magnetic recording device Benoherado Road 1+j structure according to the present invention. FIG.

Components that are the same as those in FIG. 1 are given the same numbers and their explanations will be omitted. Note that the magnetic field due to the auxiliary magnetic pole shown in FIG. 1 has been omitted. 6. Perpendicular magnetization film 130 of recording medium 1
Seven magnetic pole tips 01.62 are provided close to each other on the front side, and a U-shaped magnet is used. In this U-shaped electromagnet 6, 7 is a U-shaped magnetic body that surrounds the U-shaped magnetic path, 8 is an excitation coil wound around this U-shaped magnetic body 7, and 81.
82 is a terminal of this excitation coil.

The end face 41 of the main magnetic pole 4 is arranged on the same plane as the end faces 61 and 62 of the magnetic body 7, or is made to protrude slightly.

In the head load machine +i#Ic configured in this way, when a direct current is applied between the terminals 81 and 82, a magnetic field 9 is generated as shown by the arrow. Magnetic field 9 emitted from magnetic material 7
passes vertically through the perpendicularly magnetized film 13 and horizontally (passes through the perpendicularly magnetized film 12 in the horizontal direction, again perpendicularly penetrates the perpendicularly magnetized film 11!I!13 and enters the magnetic body 7. Since it is equidistant from both magnetic poles, the magnetic fields in different directions cancel each other out and do not allow magnetization.The electromagnet 6 attracts and contacts the recording medium 1 at its two magnetic poles 61 and 62 due to the closed magnetic field 9. As a result, the recording medium 1 is pressed against the end surface 41 of the main magnetic pole 4.
By maintaining a small distance P81[, the state shown in Fig. 1↓2 can be realized. The gravitational force F generated by the electromagnet at this time
is approximately expressed as the following 4〉 length.

'O B: Both pole ends (31,
Magnetic flux density S in the gap facing 62: 1 (] 1 and fIt de of each gap.; The magnetic permeability of air, that is, the attractive force F is the product of the cross section U (S and the square of the magnetic flux density B; If the area S1c is made sufficiently larger than the cross-sectional area of the main magnetic pole 4, the required attraction force can be obtained and at the same time the magnetic flux density B
can be made negligibly small compared to the magnetic flux density due to the main magnetic pole. In addition, the magnetization characteristics of the perpendicular magnetization film 13 have hysteresis, and a low level (saturation magnetization force)
Unless a higher magnetic flux density is applied, recording due to residual magnetization will not occur. Therefore, if the magnetic flux density B is kept below this level, there will be no fear that the original information on the recording medium 1 will be erroneously rewritten in the cap.

FIG. 4 is an explanatory diagram showing an example of a more practical application of the above embodiment. The magnetic body 7 and the main magnetic pole 4 are integrated together with a non-magnetic holder (epoxy or the like) 21. The auxiliary magnetic pole 2 and the coil 3 are similarly integrated by a non-magnetic holder 22.

FIG. 5 is a configuration explanatory diagram showing another embodiment, in which instead of using an auxiliary magnetic pole, a magnetic material 31 is attached to the side surface of the main magnetic pole 4, and the main magnetic pole excitation type is vertically bent so that it is directly excited by the coil 62. The case of the head is shown. 53 is a non-magnetic holder for integrating the whole.

In addition, it is also possible to apply the present invention to NIA, DE, etc.

In each of the above embodiments, a U-shaped magnetic body is used as the U-shaped electromagnet, but other shapes similar to this, such as a U-shape, can of course be used.

According to the above embodiments, there are many advantages as follows.

In other words, the direct current -4 flowing through the coil of the electromagnet is controlled, +I
By doing so, the contact pressure between the main pole and the recording medium can be accurately controlled. Therefore, the gear and gap between the recording medium and the main magnetic pole can be made sufficiently small.
Good playback efficiency. In addition, since an appropriate contact pressure can be obtained, there is no possibility that uneven running speed will occur or that the recording medium will be disturbed.

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 overall size can be made much smaller than the conventional soresoid system.

Also, it does not cause the samurai problem like the conventional Heradlord (a +4).

Also, the response speed during head load/-Bt-load is excellent.

Furthermore, by suitably 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 head is in contact with one side, there is sufficient strength in terms of strength even if the base thickness of the recording medium is made thinner, which has the effect of reducing the cost of the recording medium and improving recording and reproducing characteristics.

In each of the embodiments described in section 2, the recording medium is sucked with the front and rear sides fixed, but the head may be configured to move toward the recording medium.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a perpendicular magnetic recording device having a radial load mechanism that allows the contact between the recording medium and the head to be freely controlled, enables efficient recording and reproduction, and prevents the recording medium and the head from getting stuck. This can be achieved with a simple configuration.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the principle of a conventional auxiliary magnetic pole excitation type vertical to do. Fig. 2 is an explanatory diagram of an example of a droop state. Figure 4 is an explanatory diagram of the configuration, and Figure 5 is an explanatory diagram showing an application example of Figure 16.
FIG. 2 is a configuration explanatory diagram showing another detailed example of the present invention. 1... Perpendicular recording medium, 4... Main magnetic image, 6... U
Letter-shaped electromagnet, 9...Closed magnetic circuit, 12...Horizontal (magnetization IN
v" ... vertical "i magnetized film. Claw 1 Figure 2 Prisoner Tsuta 3 Figure

Claims (1)

[Claims] Both magnetic poles of a U-shaped electromagnet are placed close to the travel path of the perpendicular recording medium on the same side as the main magnetic pole, and the water 3 in the perpendicular recording medium is
A perpendicular magnetic recording device, wherein a closed magnetic path is formed by a dow magnetized film, a perpendicular magnetized film, and the U-shaped electromagnet, and the perpendicular recording medium and the main pole are brought into close proximity or in contact with each other by the attractive force of the U-shaped electromagnet.