JPS59142701A - Vertical magnetic recording device - Google Patents

Abstract

PURPOSE:To secure the contacting between a vertically magnetized film layer and the main magnetic pole of a magnetic head and to perform recording and reproduction effectively by pressing a vertical magnetic head against a surface of a flexible vertical magnetic recording medium for both-surface recording which is used actually for recording and reproduction. CONSTITUTION:The vertical magnetic recording device consists of a head 30A which records and reproduces a signal on and from the side A of the disk medium WRM stored in a jacket JK, a head 30B for the side B, and arm driving mechanisms 40A and 40B which control expansion/contraction drive as shown by arrows F1 and F2 in a figure. When a head selection command for selecting one head is outputted from a head selecting circuit 80 in this device, a switching transistor turns on to activate only the arm driving mechanism 40A. Consequently, this arm driving mechanism 40 expands a supporting arm 41A, which contacts the disk medium WRM so that the head surface is pressed against the disk medium WRM.

Description

[Detailed Description of the Invention] The present invention relates to a perpendicular magnetic recording device that uses a perpendicular magnetic recording method to record and reproduce signals, and in particular uses a flexible perpendicular magnetic recording medium for double-sided recording as a recording medium. The present invention relates to the structure of a perpendicular magnetic head of an apparatus and the embodiment of the manner in which the magnetic head accesses the recording medium.

Perpendicular magnetic recording has been actively researched and developed in recent years as a magnetic recording method that enables high-density recording that overcomes the theoretical limits of conventional magnetic recording methods.

By the way, this perpendicular magnetic recording method is a method that attempts to perform magnetic recording in the "thickness direction" of a recording medium such as a tape or disk, so it goes without saying that this recording medium
This recording/reproducing head, that is, a perpendicular magnetic head, naturally requires a head with characteristics different from those of conventional magnetic heads. That is, in a perpendicular magnetic head, a) since the recording medium has magnetic perpendicular anisotropy, the distribution is sharp and a large perpendicular magnetic field can be generated to sufficiently magnetize the magnetic field.

and b) It is possible to record on a recording medium with a small magnetomotive force and to extract a large playback output from the recorded recording medium.

is mainly required. A single-pole head in which a soft magnetic film is used as the main pole has been proposed to meet these requirements. There are two types of single magnetic pole heads: a zero main pole excitation type magnetic head and an O auxiliary pole excitation type magnetic head.The basic configuration and operation of these magnetic heads are shown in Figures 1 and 2 below, respectively. This will be briefly explained with reference to the drawings.

As shown in Fig. 1, the main pole excitation type magnetic head is made of a soft magnetic thin film such as a nickel (Ni)-iron (Fe) alloy, and its tip slides onto the magnetic layer (shaded area in the figure) of the recording medium RM. 1. The main magnetic pole H is arranged to be in contact with the main magnetic pole H, and nine excitation coils are wound around the main magnetic pole H. A signal is recorded on the magnetic layer of the recording medium RM by the strong perpendicular magnetic field of the main magnetic pole 11 which is magnetized by applying an appropriate voltage to the excitation coil [to excite the main magnetic pole U, and the magnetic layer of the recording medium RM is The main pole 11 is magnetized by the perpendicular magnetic field from the layer, and an excitation current corresponding to this magnetization is extracted from the excitation coil 12 to reproduce a signal.

As shown in FIG. 2, the auxiliary magnetic pole excitation type magnetic head is made of a soft magnetic thin film of nickel-iron alloy, etc., and is arranged so that its tip is in sliding contact with the magnetic layer (hatched area in the diagram) of the recording medium RM. The main magnetic pole 21 is made of a high magnetic permeability magnetic material such as ferrite and has a sufficient thickness compared to the main magnetic pole 21.The auxiliary magnetic pole 21 is arranged to face the tip of the main magnetic pole 21 via the recording medium RM. The main magnetic pole 210 is configured to have a magnetic pole 22 and an excitation coil n wound around the auxiliary magnetic pole 22, and is generated by applying an appropriate voltage to the excitation coil to excite the auxiliary magnetic pole n. Recording medium R
It operates to record a signal in the magnetic layer of the TFC recording medium RM, and to reproduce the signal by guiding the magnetic flux of the main magnetic pole 21 magnetized by the perpendicular magnetic field from the magnetic layer of the TFC recording medium RM to the auxiliary magnetic pole 22.

By the way, these single-pole heads have an open magnetic path structure, as is clear from FIGS. Although the conversion efficiency seems low,
When actually recording and reproducing the above-mentioned signals using the same single-pole head, there is a strong interaction between the magnetically perpendicular anisotropic recording medium and the main pole of the single-pole head. Electromagnetic conversion is performed effectively. This situation will be explained with reference to FIG. In Fig. 3, 1 is the main magnetic pole,
2 is a perpendicular magnetization film layer of the recording medium made of a cobalt (CO)-chromium (Cr) film or the like.

Now, when recording a signal, if the perpendicular magnetic film layer 2 is magnetized perpendicularly by the magnetization Mh of the main magnetic pole 1 (this magnetization is denoted by MHI), then the main magnetic pole 1 is on its surface (on the main magnetic pole 1 side). A magnetic charge of opposite polarity to the magnetic charge at the tip is generated. The magnetic charge generated on the surface of the perpendicularly magnetized film layer 2 acts to relax the demagnetizing field H(1) at the tip of the main magnetic pole 1. This causes the magnetization Mh of the main magnetic pole 1 to change The magnetization Mm of the magnetic field and the magnetization Mm of the magnetic field are mutually strengthened, so that effective magnetic recording is performed.

When reproducing a good signal, the main magnetic pole 1 is magnetized by the magnetization Mm of the perpendicular magnetization film layer 2. At this time, the above-mentioned surface magnetic charge of the perpendicular magnetization film layer 2 (more precisely, the difference magnetic charge from the magnetic charge poisoned from the back surface of the perpendicular magnetization film layer 2) is the demagnetizing field H ( 1, and substantially strengthens the magnetization of the main magnetic pole 1. This also ensures sufficient reproduction magnetization, and the aforementioned excitation coil (not shown in FIG. 3) receives 19 reproduction magnetization. The magnetization of the main pole 1 acts to simultaneously remagnetize the perpendicularly magnetized film layer 2, and as a result, the magnetization level in the perpendicularly magnetized film layer 2 also increases.

In this way, in the perpendicular magnetic recording method using a recording medium having perpendicular magnetic anisotropy and a single magnetic pole head, due to the above-mentioned interaction between the main magnetic pole and the recording medium,
The tip of the main magnetic pole operates in a closed magnetic path,
This enables efficient recording and playback.

For this reason, especially in the perpendicular magnetic recording system, it is an important requirement to ensure that the magnetic head (main magnetic pole) and the recording medium are in reliable contact.

Let us now consider the case where the above-mentioned perpendicular magnetic recording method is applied to a double-sided double-sided drive type device that uses a flexible double-sided recording perpendicular magnetic recording medium, that is, a 70 bp disk for double-sided recording.

In a conventional magnetic recording device with a double-sided drive using a ring head, two magnetic heads (usually so-called Katamashin-ya magnetic heads are used) held by a gimbal mechanism are used to record a disk, which is a recording medium, from both sides. This ensures that the disk can be accessed no matter how it rotates.

However, this method is a device using the ring head described above, in which the magnetic pole makes surface contact with the recording medium and detects the magnetic flux due to the difference in magnetic potential between the magnetic potential on the upstream side of the recording medium and the magnetic potential on the downstream side across a gap. However, as mentioned above, in a perpendicular magnetic recording device using a single magnetic pole head in which the magnetic pole makes line contact with the recording medium and detects the surface magnetic field of the recording medium, this head (main magnetic pole) and the recording medium It has been difficult to secure contact with the government, and the project has not yet materialized.

The present invention has been made in view of the above circumstances, and ensures reliable contact between a perpendicular magnetic recording medium for double-sided recording and a single-pole type perpendicular magnetic head, thereby effectively recording and recording signals between both sides of the recording medium. An object of the present invention is to provide a perpendicular magnetic recording device that can perform reproduction.

In order to achieve such an object, the present invention uses a flexible perpendicular magnetic recording medium for double-sided recording,
Further, the head surfaces of the perpendicular magnetic heads disposed on both sides of the recording medium are each provided with a predetermined convex curved surface, so that during actual recording and reproduction, at least one of the two surfaces of the recording medium is used for the recording and reproduction. A perpendicular magnetic head disposed on the side of the surface is pressed against the surface that is actually used.

Therefore, according to the perpendicular magnetic recording apparatus according to the present invention, the perpendicular magnetic head is pressed against at least the surface of the flexible double-sided recording perpendicular magnetic recording medium that is actually used for recording and reproduction, thereby achieving the above-mentioned The perpendicularly magnetized film layer of the recording medium and the main pole of the magnetic head are securely contacted to enable effective signal recording and reproduction, and the head surface of the magnetic head has a convex curved surface. Especially, even when the magnetic head is pressed against the recording medium as described above, smooth running (rotation) of the recording medium can be ensured.

In particular, when an auxiliary pole excitation type magnetic head is used as the perpendicular magnetic head, a main magnetic pole for the first surface of the recording medium, an auxiliary magnetic pole for the second surface of the recording medium, and a main magnetic pole for the second surface of the recording medium are used. The main magnetic poles for two surfaces and the auxiliary magnetic poles for the first ffi of the recording medium are provided in the same head, so that the magnetic pole arrangement can be made more precise and the orientation can be rationalized.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A perpendicular magnetic recording apparatus according to the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 4 shows the overall appearance of an embodiment of the perpendicular magnetic recording apparatus according to the present invention.

In other words, this embodiment of the present invention is capable of applying this A to a flexible perpendicular magnetic recording medium for double-sided recording (hereinafter simply referred to as disk medium, referring to a floppy disk for double-sided recording) housed in a JK. A perpendicular magnetic head (hereinafter simply referred to as head) 30A that records and reproduces signals on the B side, a perpendicular magnetic head (hereinafter simply referred to as head) 30B that also records and reproduces signals on this B side, and these heads 30A and 30B, respectively. Supporting head support arms 41A and 41B are supported based on predetermined electrical signals applied via IJ-wires 42A, 43A and 42B, 43B, respectively, in an embodiment shown by arrows F1 and F2 in the figure, respectively. Arm drive mechanism 40 that controls telescopic drive with
A and 40B, these arm drive mechanisms 40A and 4
The support arm 50 is connected to the arrow F3 in the figure via the support arm 50, gear 61, and gear 51 that integrally support 0B.
A stepping motor ω that selects a track on the disk medium WRM by sliding it in the manner shown in FIG. The support arm 41 described above is based on the head select signal H8 and head load signal HL.
A and 41B are formed with electric signals for performing expansion/contraction drive control, and are sent to lead wires 42A and 43A, respectively.
and 42B.

The arm drive mechanism 40A and 40B via 43B
The head select circuit 80 transmits information to the head 30A.
and 3QB transmits and receives signals to be recorded on the disk medium WRM or signals reproduced from the disk medium WRM via lead wires 34A, 35A and 34B, 35B, respectively, and these signals are transmitted to and from a control circuit (not shown) at predetermined levels. Each of these signals has a recording/reproducing interface circuit which performs predetermined processing such as waveform shaping on these signals so that they can be handled as logic signals (write logic signal WT or read logic signal RD). In this device, when a head selection command for selecting one of the heads is output to the head selection circuit 8o, the arm drive mechanism (40A or 40B) on the side where the selected head is arranged will: It is assumed that the support arm supporting the head is controlled to extend so that the head surface appropriately presses and abuts the disk medium WRM. This operation will be detailed later.

FIG. 5 shows a head 30 used in the apparatus shown in FIG.
An enlarged example of A and 30B is shown. In addition, FIG. 6(a) shows the cross-sectional structure of the head shown in FIG. 5 when cut along line A-A in the figure, and FIG. 6(a) shows the cross-sectional structure when cut along line B-B in the figure. (in Figure 6).

Here, it is assumed that the aforementioned auxiliary magnetic pole excitation type heads are used as the heads 30A and 30B. That is, in these FIGS. 5 and 6, 31A.

31B is the main magnetic pole, 32A, 32B auxiliary magnetic pole, 33A,
33B is an excitation coil, of which the disk medium WR
Main magnetic pole 31A for A side of M and auxiliary magnetic pole 32A for B side (
excitation coil 33A), and main magnetic pole 31B for the B side.
and the A-side auxiliary magnetic pole 32B (including excitation-magnetic coil 33B) are integrally held by appropriate holders 34A and 34B, respectively. Therefore, when these spatula 3s 30A and 30B are mounted on the device shown in FIG. 4, the positional relationship of the respective magnetic poles is as shown in FIG. 7. The main magnetic pole 31B and the auxiliary magnetic pole 32A are opposed to each other with the disk medium WRM in between. Note that FIG. 7 shows these heads 30A and 30B along line A-A in FIG. 5 or FiB.
- The cross-sectional structure of each cut along the center line in the direction perpendicular to line B is shown. Friend, these heads 30A and 3QB have their head surfaces finished with predetermined convex curved surfaces as shown in FIGS.
Even when pressing M, smooth driving of the disk medium WRM can be maintained.

Finally, the operation related to the head selection mentioned above will be specifically explained with reference to FIGS. 8 and 9.

In this embodiment device, the arm drive mechanisms 40A and u40B correspond to, for example, a solenoid having a movable iron core as a part of the support arms 41A and 41B, respectively, or sliding of a cylinder piston based on the opening and closing of an appropriate electromagnetic valve. The support arm is constructed using well-known means for converting so-called electrical energy into mechanical energy, such as a fluid pressure circuit that extends and retracts these support arms. Further, the head select circuit 80 has terminals T1 and T1, for example, as shown in FIG.
and the aforementioned head select signal H applied to T2.
8 and the head load signal ML and performs the logical product thereof; a switching transistor 82 that is turned on under the condition that the output of the AND circuit 81 is at a logic level of 1 high; and the head select signal ML. The AND circuit section receives the signal obtained by inverting the logic of H8 using an inverter and the head load signal HL and calculates the logical product of the two. The arm drive mechanism 4
Each 0A electrical energy input terminal has a lead wire of 42A.
and the DC power terminal T3 of this head select circuit button and the collector terminal T4 of the switching transistor 82 through the OA, and is connected to the other arm drive mechanism 4.
Each 0B electrical energy input terminal has a lead wire 42B.
and 43B, it is connected to the DC power supply terminal T5 of this head select circuit and the collector terminal T6 of the switching transistor.

Therefore, the head load signal HL is now false.
``In other words, if the logic level is 6 high level'', the output logic level of the AND circuit 81 and the output signal will both be ``low level'' regardless of the logic level of the head select signal H8.
0 A j? Both the workpieces 40B are also inactive, and support arms 41A and 4 are attached to the workpieces 9 shown in FIG. 9(a), respectively.
1B in a contracted state, that is, heads 30A and 30
B is kept separate from the disk medium WRM.

Next, the head load signal HL becomes "true", that is, the logic level is 60-level, and the head select signal H8 at this time is the logic level 60-level;
h-) fc, only the output logic level of the AND circuit 81 and the AND circuit 81 is 6 high level, so the switching transistor 82 is turned on and the arm drive mechanism of the arm drive mechanisms 40A and 40B is turned on. Only the mechanism 40A becomes active.As a result, the arm drive mechanism 40A extends the support arm 41A as shown in FIG. Bring it into contact with the disk medium WRM.

In addition, if the head load signal HL is "true" and the head select signal H8 is at the logic level A/% level, then, contrary to the above, only the output logic level of the antenna circuit is set to 6 levels. level, and only the other arm drive mechanism 40B becomes active.

That is, in this case, the head 3QB contacts the disk medium WRM in a manner similar to that shown in FIG. 9(b).

In the above-mentioned embodiment, auxiliary pole excitation type heads were used as y'f30A and 3QB, but the device configuration would be the same even if a main pole excitation type head as shown in FIG. 1 was used. Of course it can be done.

[Brief explanation of the drawing]

Figure 1 is a side view showing the basic configuration of a main pole excitation type perpendicular magnetic head, Figure 2 is a side view showing the basic configuration of an auxiliary pole excitation type perpendicular magnetic head, and Figure 3 is the main pole of the perpendicular magnetic head. FIG. 4 is a perspective view showing the overall configuration of an embodiment of the perpendicular magnetic recording device according to the present invention, FIGS. 5 and 6, and FIG. 7 is a perspective view and a sectional view showing the external appearance and cross-sectional structure of an example of the head used in the embodiment shown in FIG. 4, and FIG. 8 is a specific example of the head select circuit shown in FIG. 4. FIG. 9 is a side view showing the operating mode of the embodiment shown in FIG. 4. 3QA, 30B...head, 31A, 31B...main magnetic pole, 32A, 32B--auxiliary magnetic pole, 33A, 33B-
...Exciting coil, 34A, 34B...Holder, 35A
, 35B, 36A, 36B... Lead wire for recording/reproduction, 40A, 40B... Arm drive mechanism, 41A
, 41B--head support arm, 42A, 42B
. 43A, 43B-1 head selection lead wire, 50...
Support arm, 51, 61... Gear, ω... Stepping motor, 70... Drive 2 drive motor, 71...
・Belt, 80...Head select circuit, 81, 8
4...AND circuit, 82, 85...switching transistor, 83...inverter, 卍...recording
Playback interface circuit No. 9 (0) Figure (b)

Claims (1)

[Scope of Claims] (1) A perpendicular magnetic recording device that performs perpendicular magnetic recording and reproduction by disposing perpendicular magnetic heads on both sides of a flexible double-sided recording perpendicular magnetic recording medium, which comprises: Each of the head surfaces of two perpendicular magnetic heads has a predetermined convex curved surface,
Further, at least one of the two surfaces of the perpendicular magnetic recording medium that is actually used for recording/reproduction is provided with means for pressing a head surface of a perpendicular magnetic head disposed on the surface. Perpendicular magnetic recording device. (2) The convex curved surface is a spherical surface (Claim No. α)
The perpendicular magnetic recording device described in . (3) The perpendicular magnetic recording device according to claim (1), IJ, wherein the convex curved surface is a cylindrical surface. (4) The perpendicular magnetic head has a main magnetic pole made of a soft magnetic film, and an auxiliary magnetic pole that is wound with an excitation coil for recording and reproducing and is arranged to face the main magnetic pole and the perpendicular magnetic recording medium. an auxiliary magnetic pole excitation type magnetic head having a main magnetic pole for a first surface of the perpendicular magnetic recording medium and an auxiliary magnetic pole for a second surface of the perpendicular magnetic recording medium; The perpendicular magnetic recording device according to claim ?), wherein a main magnetic pole for two surfaces and an auxiliary magnetic pole for the first surface of the perpendicular magnetic recording medium are provided in the same head. (5) The perpendicular magnetic head according to claim 0, wherein the WR direct magnetic head is a main pole excitation type magnetic head in which an excitation coil for recording and reproduction is wound around a soft magnetic film serving as a main pole. Recording device.