JPS63142568A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To allow a recording medium to be stably in contact with a gap section with a small load and hence to improve the durability and reliability of a device by positioning a magnetic gap on the rear end side of the head and allowing only the vicinity of the magnetic gap to be in contact with the recording medium. CONSTITUTION:The magnetic gap 15 of the magnetic head 10 is positioned on the rear end side from the center of the travelwise length of the recording medium. And one side of the magnetic head 10 is supported with a free movement of turning in the traveling and radius directions of the medium, and its turning center is positioned on the rear end side from the center of the medium travelwise length to allow only the vicinity of the magnetic gap 15 to make contact with the medium 30. Consequently, since only a part of the magnetic gap 15 comes into contact with the medium with a contact pressure Po, only 1/4 of the conventional friction force is suffered, thus keeping in good enough and stable contact with the medium with a small load so as to improve the durability and reliability of a device.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Industrial Application Field) The present invention relates to a magnetic recording and reproducing device that records and reproduces signals by bringing a magnetic head into contact with both the front and back sides of a flexible magnetic recording medium. In particular, the present invention relates to a magnetic recording/reproducing device that improves the contact between a head and a medium.

(Prior Art) Conventionally, as a magnetic recording and reproducing device for recording and reproducing signals,
Various floppy disk devices are used. Fifth
The figure shows a magnetic head used in a general floppy disk device, and the magnetic head 50 is composed of two sliders 51 and 52.
A magnetic core 53 is formed in the magnetic core 53 . Further, the magnetic recording medium facing surface 54 of the magnetic head 50 has a planar shape. The magnetic gap 55 is located approximately at the center of the length of the flat portion of the magnetic core 53 in the running direction of the magnetic recording medium.

There are two types of floppy disk drives: single-sided and double-sided. The double-sided type is more advantageous in terms of storage capacity. A double-sided floppy disk device has a magnetic head 50 having the above structure.
As shown in FIG. 6, a magnetic recording medium 60 is sandwiched between the front and back surfaces, and signals are recorded and reproduced in this state. The upper and lower magnetic fields of the RAD slider face each other,
The magnetic cores 53 are positioned so as not to face each other in order to prevent magnetic interference between the upper and lower magnetic heads 50.

Also, the flat parts of the upper and lower magnetic heads 50 are connected to the magnetic recording medium 6.
For easy contact with the magnetic heads 50, either or both of the magnetic heads 50 are supported as shown in FIG. That is, the magnetic head 50 is attached to a gimbal spring 71, and the gimbal spring 71 is fixed to a carriage 72. The carriage 72 is provided with a pivot 73, which acts on the center of the length of the flat surface of the magnetic head in the direction in which the magnetic recording medium runs, and applies a pressing force to the magnetic head 50 via the gimbal spring 72. It is something to give.

By supporting the magnetic head 50 in this manner, the magnetic head 50 has a degree of freedom in rotation around the point of action of the pivot 73, and the uneven contact caused by mounting errors is prevented, and the flat surface of the magnetic head 50 is easily mounted. magnetic recording medium 60
I try to bring it into contact with.

The magnetic head and magnetic head support structure of a typical double-sided floppy disk drive have been briefly explained above.
In conventional double-sided floppy disk drives, in order to bring the magnetic gap into contact with the magnetic recording medium, the entire surface of the magnetic head facing the magnetic recording medium is brought into contact with the magnetic recording medium.

By the way, the points that must be taken into consideration when designing the magnetic head shape and magnetic head support structure are as follows: 1. Allow for errors in manufacturing and installation, and determine how large a margin the magnetic gap and magnetic recording medium can be brought into contact. Can you do it.

■ How can we reduce the load on magnetic recording media?

There are two points.

As mentioned above, in the case of a conventional double-sided floppy disk drive, in order to satisfy the first point, the surface of the magnetic head facing the magnetic recording medium is made flat, the magnetic head is gimbally supported, and the entire flat surface of the magnetic head is The idea is to bring the magnetic gap into contact with the magnetic recording medium by bringing the magnetic gap into contact with the magnetic recording medium. In addition, in order to have a larger margin, the pressing force of the magnetic head should be increased or the flat area of the magnetic head should be reduced.
A method is used to increase the contact pressure on the entire surface of the surface. However, increasing the contact pressure on the entire flat surface of the magnetic head goes against the second consideration, which is to reduce the load on the magnetic recording medium. In other words, increasing the contact pressure on the entire flat surface of the magnetic head causes deterioration in the durability of the magnetic recording medium.

On the other hand, with the recent development of information processing technology, demands for higher capacity and reliability of magnetic recording and reproducing devices are increasing. In floppy disk drives, perpendicular magnetic recording media such as Co-Cr and B are used as media capable of high recording density.
Media such as a-Fe are being actively developed. Under these circumstances, in order to make full use of these media, establishing a technology to reduce the load on the magnetic recording medium and to obtain stable contact between the magnetic gap and the magnetic recording medium has become a major research topic.

(Problems to be Solved by the Invention) Conventionally, in order to easily bring the magnetic gap into contact with the magnetic recording medium, it is necessary to increase the contact pressure on the entire surface of the magnetic head facing the magnetic recording medium. However, there is a contradictory problem in that increasing the contact pressure deteriorates the durability of the magnetic recording medium.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to easily bring a magnetic gap and a magnetic recording medium into contact with each other while the load on the magnetic recording medium is sufficiently small. An object of the present invention is to provide a magnetic recording/reproducing device that can improve the durability of the medium and the reliability of the device.

[Structure of the Invention] (Means for Solving the Problems) The gist of the present invention is to bring only the vicinity of the magnetic gap into stable contact with the magnetic recording medium, thereby generating signals while minimizing the load on the magnetic recording medium. The objective is to record and play back information.

That is, the present invention provides a magnetic recording and reproducing apparatus for recording and reproducing signals by sandwiching a double-sided recording and reproducing type flexible magnetic recording medium between front and back surfaces between magnetic heads, in which the surface of the magnetic head facing the magnetic recording medium is flat. The magnetic gap of the magnetic head is located on the rear end side of the flat part of the magnetic head from the center of the length in the magnetic recording medium running direction, and at least one of the magnetic heads is positioned in the magnetic recording medium running direction and the magnetic head. The recording medium is supported so as to have a degree of freedom of rotation around the radial direction, and the center of rotation is located on the rear end side of the longitudinal center of the magnetic head flat portion in the running direction of the magnetic recording medium.

(Function) In the conventional magnetic head and magnetic head support structure, in order to make the contact surface pressure between the magnetic gap part and the magnetic recording medium Pa, the entire surface of the magnetic head part is set to P as shown in FIG. 4(a).
The contact surface pressure will be O. Therefore, magnetic head 1
The plane area of 0 is S, the magnetic head 10 and the magnetic recording medium 3
If the coefficient of friction with 0 is μ, the magnetic recording medium 30 will receive a frictional force of Fx=Po −8·μ from the magnetic head 10.

In contrast, in the present invention, since the rotation center of the magnetic head 10 is set to the rear end side of the flat part of the magnetic head relative to the length center in the magnetic recording medium running direction, the front end of the magnetic head 10 is automatically set when the magnetic recording medium runs. floats up, making it possible to create a state in which only the vicinity of the rear end, that is, the magnetic gap portion contacts the magnetic recording medium 30. The state of contact between the magnetic head 10 and the magnetic recording medium 30 at this time is shown in FIG. 4(b).

Here, the boundary between the floating part and the contacting part of the magnetic head 10 is taken as the center position of the magnetic head flat part in the magnetic recording medium traveling direction, the magnetic gap is taken as the rearmost end of the magnetic head flat part, and the magnetic gap The contact pressure at the part is P
Let it be O. Assuming the above three points, the magnetic recording medium 30
receives from the magnetic head 10 only a friction of at most F2 = (1/4) Pa·S·μ. Note that although the magnetic recording medium 30 also receives a frictional force from the air fluid, this value is sufficiently small compared to the solid friction between the magnetic head 10 and the magnetic recording medium 30, so it can be ignored. In other words, the more the boundary between the floating part of the magnetic head and the contact part is at the rear end of the magnetic head, the smaller the frictional force can be. Therefore, according to the present invention, the load on the magnetic recording medium can be sufficiently reduced, and the magnetic gap and the magnetic recording medium can easily come into contact.

(Example) Hereinafter, details of the present invention will be explained with reference to illustrated embodiments.

FIG. 1 is a schematic configuration diagram showing the configuration of a magnetic head section used in a magnetic recording/reproducing apparatus according to an embodiment of the present invention. The magnetic head 10 is composed of two sliders 11 and 12, one of which has a core 13 formed therein.

A surface 14 of the magnetic head 10 that comes into contact with the magnetic recording medium is machined to be flat, and an edge 16 on the side surface of the magnetic recording medium inflow end of the magnetic head 10 is chamfered so as to generate air fluid pressure. The magnetic gap 15 is formed not at the center of the plane portion 14 but on the rear end side in the running direction of the magnetic recording medium. Here, there are two magnetic gaps 15, the front being the R/W gap and the rear being the erase gap.

The magnetic heads 10 are arranged facing each other with the magnetic recording medium in between, as shown in FIG. The recording medium is supported so as to have a degree of freedom of rotation around the radial direction, and the pivot point of action, which is the center of rotation, is located on the rear end side of the center of the length of the flat part of the magnetic head in the running direction. are doing. That is, the magnetic head 10 is supported at the center of the gimbal spring 21, and the gimbal spring 21 has its peripheral portion fixed to the carriage 22. A pivot 23 is fixed to the carriage 22, and the tip of the pivot 23 is in contact with the gimbal spring 21. Here, the point of contact of the pivot 23 with the gimbal spring 21 is the center of the gimbal spring 21 in the radial direction of the magnetic recording medium, but the point on the rear end side of the center (for example, Lp /
L = 0.4). In other words, the center of rotation of the magnetic head 10 is located on the rear end side of the center of the length of the flat portion of the magnetic head in the direction in which the magnetic recording medium runs.

With this configuration, the contact state between the magnetic head and the magnetic recording medium is as shown in FIG. 4(b), and the contact area of the magnetic head 10 with the magnetic recording medium 30 is small. In this case, in the part where the magnetic gap 15 is formed, the magnetic head 10 and the magnetic recording medium 3
Since there is sufficient contact with the terminal, recording and reproducing of signals can be performed stably. Therefore, the load on the magnetic recording medium 30 can be reduced, and the durability of the magnetic recording medium 30 can be improved. Furthermore, since the contact pressure between the magnetic head 10 and the magnetic recording medium 30 can be sufficiently increased at the magnetic gap position, signal recording and
Regeneration can be performed stably, and it is also possible to improve device reliability. Furthermore, since the load on the magnetic recording medium 30 is reduced, there are also advantages such as the power consumption of the motor for running the magnetic recording medium 3o can be reduced.

In addition, the present inventors used the example device and the conventional device,
We focused on the output during signal recording and reproduction and the frictional force between the magnetic head and magnetic recording medium, and conducted experiments using load as a parameter. The experimental results are shown in FIG.

Here, the symbol O is the maximum output ratio in the embodiment device, the Δ symbol is the friction coefficient in the embodiment device, the • symbol is the maximum output ratio in the conventional device, and the mu symbol is the friction coefficient in the conventional device.

Further, the maximum output ratio is the ratio of the output value under each load to the output value when the magnetic gap and the magnetic recording medium are in ideal contact. The maximum output ratio increases as the load increases in both the embodiment and the conventional example, and becomes constant at 1.0 from a certain load onwards. In other words, the magnetic gap and the magnetic recording medium came into ideal contact under this load or more.

In the case of the conventional example, the friction coefficient does not depend on the load and is approximately constant at 0.2. On the other hand, in the example, 0 in the low load region
．． 05 or less, and as the load increases, the coefficient of friction approaches 0.2 in the case of the conventional example. The most noteworthy thing here is that in this example, as can be seen from the load of 20 gf, the friction coefficient is extremely low, 0.03, which is about 1/7 of the conventional example, and the maximum output ratio is 1. 0, which means that ideal contact between the magnetic gap and the magnetic recording medium was achieved.

Note that the present invention is not limited to the embodiments described above, and can be implemented with various modifications without departing from the gist thereof. For example, the magnetic gap position may be located closer to the rear end than the center of the length of the flat portion of the magnetic head in the running direction of the magnetic recording medium, and can be changed as appropriate depending on specifications. Similarly, the point of action of the pivot is Lp
/L is not limited to 0.4 in any way, and may be located on the rear end side of the center of the length of the flat portion of the magnetic head in the running direction of the magnetic recording medium. Further, instead of supporting one of the magnetic heads with the support mechanism as shown in FIG. 2, it is also possible to apply the present invention to one in which both magnetic heads are supported by the support mechanism.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to stably perform recording and reproduction on a magnetic recording medium while the frictional force between the magnetic head and the magnetic recording medium is sufficiently reduced. Therefore, it is possible to improve the durability of the magnetic recording medium and also to improve the reliability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of a magnetic head used in a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing a schematic configuration of a support mechanism for the magnetic head, and FIG. A characteristic diagram showing the relationship between the maximum output ratio and the coefficient of friction with respect to the load, which is used to explain the effects of the above embodiment, FIG. 4 is a schematic diagram for explaining the present invention in detail, and FIGS. 5 to 7 are diagrams for explaining the conventional problems. 10...Magnetic head, 11.12...Slider, 1
3... Core, 14... Plane part, 15... Magnetic gap, 16... Corner part, 21... Gimbal spring,
22... Carriage, 23... Pivot, 30...
・Magnetic recording media. Applicant's agent Patent attorney Takehiko Suzue - 1 - Figure 1, 1:/Line direction (a) No. 6 Senkeiriki No. 71〉 1! -Inspection (b) Figure

Claims (3)

[Claims] (1) In a magnetic recording and reproducing device that records and reproduces signals by sandwiching a double-sided recording and reproducing type flexible magnetic recording medium between front and back surfaces with magnetic heads, the surface of the magnetic head that faces the magnetic recording medium has a planar shape. and the magnetic gap of the magnetic head is located at a flat part on the rear end side of the length center of the flat part of the magnetic head in the running direction of the magnetic recording medium, and at least one of the magnetic heads is located in the flat part of the flat part of the magnetic head in the running direction of the magnetic recording medium and the magnetic recording medium. A magnetic recording device that is supported so as to have a degree of freedom of rotation around the radial direction, and that the center of rotation is located on the rear end side of the flat surface of the magnetic head relative to the center of the length of the magnetic recording medium in the running direction. playback device. (2) At least one of the magnetic heads is attached to a gimbal spring and has a degree of freedom of rotation about the point of action of a pivot that abuts the gimbal spring. 2. The magnetic recording and reproducing device according to item 1. (3) The magnetic recording/reproducing device according to claim 1, wherein the edge of the surface of the magnetic head facing the magnetic recording medium is chamfered.