JPH01286169A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To show the good contact condition between a head and an FF by satisfying a space (b) between a head part and a magnetic head part of a magnetic head body disposed on the other side via the medium and a space (a) between the magnetic head part and a pressing member which is the closer one to this head part itself with specific condition. CONSTITUTION:The positioning relationship between the pressing members 23 and 24 and the magnetic head parts 21 and 22 is settled to be satisfied with the condition of b/2<=(a)<=(b), provided that a distance between the heads 21 and 22 is (b), and a distance between the head 21 and the pressing member 23 as closer to this head itself is (a). Then, the members 23 and 24 are disposed to the head parts 21 and 22 with a prescribed space, while the height of each top of the head pats 21 and 22 is projected from the members 23 and 24 respectively by a prescribed dimension delta in this constitution. By this method, the magnetic head part is brought with its top as a leading part into contact with the FF, whereas this top is provided with a cap, so that the cap is accurately abutted on the FF, thus obtaining the excellent magnetic recording and reproducing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus using a flexible disk-shaped recording medium (hereinafter sometimes referred to as a floppy disk).

2. Description of the Related Art Conventionally, there is a method shown in FIG. 5 as a means for magnetically recording and reproducing information on both sides of a floppy disk.

That is, a pair of helad sliders 2 and 3 are arranged at positions facing each other with a predetermined force so as to hold the floppy disk 1 from both sides. The magnetic head units 4 and 5 contact the floppy disk 1 with a predetermined surface pressure to perform magnetic recording and reproduction. The head sliders 2 and 3 enclose magnetic head portions 4 and 5 made of ferrite or other materials such as ceramics, and the surfaces in contact with the floppy disk 1 are polished smooth.

In the above-described magnetic recording and reproducing, the magnetic head section 4
．． The quality of the contact between the magnetic recording medium and the magnetic recording medium greatly influences the characteristics of magnetic recording and reproduction.

Problems to be Solved by the Invention In the conventional configuration described above, for example, when the flatness of the floppy disk 1 is poor, the pair of upper and lower helad sliders 2,
3, the deformation of the floppy disk 1 was not sufficiently corrected, and the floppy disk 1
will not make contact, and good recording and playback will not be possible.

These problems become more noticeable when the recording density is increased. The higher the recording density, the higher the magnetic head parts 4 and 5.
At the contact area between the floppy disk 1 and the floppy disk 1, it is required to stably maintain a smaller gap, and it is necessary to maintain a smaller clearance between the floppy disk 1 and the magnetic heads 4 and 5. Although it is necessary to improve relative positional accuracy, problems have arisen in that the cost involved in manufacturing the device has increased, and in practice, it has become impossible to obtain a reproducing force that enables magnetic recording and reproducing.

In view of this conventional situation, even if the floppy disk is warped or there is a relative positional error between the floppy disk and the magnetic head, it is possible to maintain a stable contact state between the magnetic head and the floppy disk, and therefore it is possible to maintain a stable contact state between the magnetic head and the floppy disk. In order to provide a double-sided magnetic recording and reproducing device capable of high-density recording and reproducing, as shown in FIG. In the apparatus for recording and reproducing information by holding the magnetic head bodies 7 and 8 against the medium under a predetermined contact pressure on both upper and lower surfaces, the magnetic head body 7°8 is connected to the magnetic head parts 9 and 10. and pressing members 11 and 12 disposed at a predetermined interval from each other, and the magnetic head portion The inventors of the present invention have already proposed a magnetic recording/reproducing device characterized in that the top of the magnetic head is arranged so as to protrude by a predetermined amount.

FIG. 7 is a perspective view of the magnetic head body shown in FIG. 6, showing the outline of the shape of the reed and pressing member 12.

Further, FIG. 8 shows another conventional example of a magnetic head body. It has a substantially annular pressing member sliding surface 14, and a magnetic head portion 13 is provided inside the pressing member, with its top portion protruding beyond the pressing member sliding surface 14 by a distance δ.

A magnetic recording/reproducing device may be constructed by combining one more magnetic head body 16 having the same shape as the illustrated magnetic head body 16, or by combining a magnetic head body 15 with a magnetic head body 15 without the nonwoven fabric 16, as shown in FIG. Similarly, it is arranged so as to sandwich both sides of the floppy disk 6.

In this embodiment, a nonwoven fabric 16 is attached to the sliding surface 14 of the pressing member to alleviate the sliding friction between the floppy disk 6 and the pressing member.

In this case, there is no need to use ceramics that are difficult to process, such as barium titanate, for the pressing member main body.

The present invention provides a double-sided magnetic recording and reproducing device that is capable of easily achieving good contact between the magnetic head and the floppy disk in the above-mentioned magnetic recording and reproducing device, and is therefore capable of high-density recording and reproducing. The purpose is to

Means for Solving the Problem In order to achieve this object, the magnetic recording and reproducing apparatus of the present invention provides a magnetic recording and reproducing apparatus for a flexible magnetic recording medium, in which a magnetic head body having at least one pair of magnetic head sections that do not face each other is attached to the medium. On the other hand, it is a device that records or reproduces information by being held under a predetermined contact pressure from both sides,
The magnetic head body includes a magnetic head portion and a pressing member disposed at a predetermined distance from the magnetic head portion,
and with respect to a surface of the pressing member that comes into sliding contact with the medium,
In the magnetic head body of the magnetic recording and reproducing device, the top of the magnetic head unit is disposed so as to protrude by a predetermined amount, and the magnetic head unit of the magnetic head body is disposed on the other side with the medium interposed between the magnetic head unit and the magnetic head unit. Let b be the distance between the magnetic head section and the pressing member that is closer to the magnetic head section, and let a be the distance between the magnetic head section and the pressing member that is closer to itself.

Function: By using the magnetic head constructed as described above, warpage of the floppy disk or misalignment of the relative position between the floppy disk and the magnetic head (particularly relative misalignment in the direction perpendicular to the surface of the floppy disk) can be avoided. This is corrected by the above-mentioned pressing member, and does not directly affect the contact state between the magnetic head section and the floppy disk, so that a stable contact state can always be realized.

At this time, the contact pressure between the magnetic head section and the floppy disk is determined by the amount of protrusion of the top of the magnetic head section from the sliding contact surface of the pressing member, and the magnetic field of the magnetic head body placed on the other side via the magnetic head section and the magnetic recording medium. a distance a between the magnetic head and the pressing member that is closer to itself;
It is determined by the deformation resistance of the floppy disk, and when the above dimensions a and b satisfy the relationship '/2 ≦a ≦b, contact with the floppy disk is made centering on the apex of the magnetic head section. By ensuring the contact between the gap portion of the magnetic head and the floppy disk, good magnetic recording and reproduction can be obtained, and high-density recording and reproduction, which has been difficult in the past, becomes possible.

Embodiment FIG. 1 shows the state of contact between a pair of magnetic head bodies and a floppy disk in an embodiment of the present invention. Reference numeral 18 denotes a rotationally driven floppy disk, the upper and lower surfaces of which are coated with r-Fe203 magnetic material together with a resin binder.

19.20 indicates a pair of magnetic head bodies, each of which is
It is composed of magnetic head parts 21 and 22 and pressing members 23 and 24. The pressing members 23 and 24 are made of barium titanate with excellent wear resistance, a resin material, or a resin material containing microparticles of self-lubricating polytetrahololoethylene (PTFE). The surface of the floppy disk is polished smooth to prevent scratches from sliding contact with the floppy disk.

These pressing members 23, 24 and magnetic head portion 21゜2
2, the distance between the magnetic head parts 21 and 22 is b,
When a is the distance between the magnetic head section 21 (or 22) and the pressing member 23 (or 24) that is closer to itself, a and b are set so as to satisfy the condition of 5≦a≦b. Yes, the pressing members 23 and 24 are connected to the magnetic head section 21.
22, and the height of the top of the magnetic head portion 21.22 is equal to that of the pressing member 23°24.
It is configured to protrude by a predetermined distance δ.

The distance between the magnetic head parts 21 and 22, the magnetic head part 2
1 (or 22) and the pressing member 23 that is closer to itself
(or 24), '/2 ≦a
The basis for setting the condition to satisfy the condition ≦b will be described in detail below.

Figures 2a and b show two-dimensional mechanical model diagrams of Figure 1. In Figure 2a, both ends of the beam are fully fixedly supported, and in Figure 2, both ends of the beam are simply supported. The two-dimensional dynamic model with the configuration shown in Figure 1 is located between Figure 2a and Figure 2A. In FIG. 2a and the same figure, W is the head load caused by the magnetic head portions 21 and 22 of FIG. 1, MA.

MB is the fixed moment generated when the floppy disk is held between the pressing members 23 and 24, RA,
RB is a reaction force generated when the floppy disk is held between the pressing members 23 and 24. Dimensions a, b
Points A, B, C, and D are shown in the figure, and the straight line connecting points A and B is a floppy disk. In FIG. 2d, the static coupling conditions and deformation conditions such as deflection, MA, Mn, RA, and RB can be expressed by equations (2) and (3), respectively.

Further, the deflection angle 1 of the floppy disk between point C and the dot can be expressed by equation (4) at distance I from point B. In equation (4), Σ is the Young's modulus of the floppy disk, and Σ is the second moment of area.

In equation (4), x = a, and the condition that i = o at the load point of the shoe head is a = b.

On the other hand, in Figure 2, from the static coupling condition,
RA and RB can be expressed by equation (5).

Further, the deflection angle i of the floppy disk between point B and the dot can be expressed by equation (6) at the distance X from point B. In equation (6), Σ is the Young's modulus of the floppy disk, and Σ is the second moment of area.

As mentioned above, the two-dimensional dynamic model with the configuration shown in Fig. 1 is located between Fig. 2 a and Fig.
The relational expression between a and b to realize 1==o is ('
f) Expression:

If d and b satisfy equation ('7), then i
=0 is satisfied. i=o means that the floppy disk 18 in FIG.
If there is a gap at the apex of the magnetic head section 21, this means that the floppy disk 18 will accurately contact the gap. Since the magnetic head section 22 is symmetrical, good contact between the magnetic head section 22 and the floppy disk 18 can be obtained in the same way as described above. As described above, the dimensional relationship for obtaining good contact between the magnetic head section and the floppy disk is as shown in equation (7).

On the other hand, in FIG. 1, the contact pressure between the magnetic head sections 21 and 22 that perform magnetic recording and reproduction and the floppy disk surface is:
For the floppy disk 18, the magnetic head section 21.
22 is obtained as the deformation resistance when pushing in by the dimension δ.

In other words, since the contact pressure is almost determined only by the deformation resistance of the floppy disk 18, the protrusion amount δ, the distance between the heads, and the distance a between the head and the pressing member, the dimensions δ, a, b
As long as these are properly managed, a stable contact state can be achieved without being affected by external factors such as the aforementioned warping of the floppy disk 18, and high-density magnetic recording and reproducing, which has been difficult in the past, becomes possible. .

The pair of magnetic head bodies 19 and 20 configured as described above is designed to sandwich the floppy disk 18 from both the upper and lower surfaces with a predetermined pressure using the same means as in conventional double-sided recording type floppy disk devices (e.g., Japanese Patent Application No. 57-44255). can be attached to the recording/playback device.

At this time, the contact pressure between the pair of magnetic head bodies is the same as that of the floppy disk 18 and the magnetic head bodies 19, 20, . !
: Mainly used to correct deformation of the floppy disk 18 due to misalignment of the floppy disk 18 in the vertical direction.

FIG. 3 shows a perspective view of the magnetic head body shown in FIG. 1, and shows the outline of the shape of the pressing member 24. As shown in FIG.

Further, FIG. 4 shows another embodiment of the present invention. It has a substantially annular pressing member sliding contact surface 26, a magnetic head portion 25 is placed inside the pressing member, and the top thereof is connected to the pressing member sliding contact surface 26.
It is provided so as to protrude from 6 by a dimension δ.

The magnetic recording/reproducing device may be constructed by combining another magnetic head body 27 having the same shape as the illustrated magnetic head body 27, or by combining the magnetic head body 27 and a magnetic head body 27 without the nonwoven fabric 28, as shown in FIG. Similarly, it is arranged so as to sandwich both sides of the floppy disk 18.

In this embodiment, a nonwoven fabric 28 is attached to the sliding contact surface 26 of the pressing member to alleviate the sliding friction between the floppy disk 18 and the pressing member. In this case, for a necessary magnetic recording medium that uses ceramics that are difficult to process, such as barium titanate, the pressing member main body section is provided with a magnetic head body having at least one pair or more of magnetic head sections that do not face each other. , a device for recording or reproducing information by holding the magnetic head body under a predetermined contact pressure from both sides, the magnetic head body including a magnetic head portion and a pressing force disposed at a predetermined distance from the magnetic head portion. In the magnetic head body of the magnetic recording and reproducing device, the magnetic head body is made of Let b be the distance between the head portion and the magnetic head portion of the magnetic head body disposed on the other side with the medium interposed therebetween, and let the distance between the magnetic head portion and the pressing member closer to itself be the distance a. and b is '/2 ≦a ≦b
By setting the conditions such that the following conditions are met, contact with the floppy disk will be made centering on the apex of the magnetic head, and if a gap is placed at the apex of the magnetic head, the floppy disk will be in accurate contact with the gap. Good magnetic recording and reproduction can be obtained, and the contact pressure between the magnetic head and the floppy disk is directly affected by the warpage of the floppy disk and the vertical displacement of the magnetic head relative to the floppy disk. It is possible to achieve stable and good contact conditions, and it is possible to perform high-density magnetic recording and reproducing, which has been difficult in the past.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the mutual relationship between the head and the floppy disk of a magnetic recording/reproducing device in an embodiment of the present invention;
2a and b are dynamic model diagrams of FIG. 1 in an embodiment of the present invention, FIG. 3 is a perspective view of a magnetic head body in an embodiment of the present invention, and FIG. 4 is a diagram in another embodiment of the present invention. A perspective view of a magnetic head body, FIG. 5 is a side view of a conventional example, FIG. 6 is a side view of another conventional example, FIG. 7 is a perspective view of a magnetic head body in another conventional example, and FIG. 8 is a side view of another conventional example. FIG. 2 is a perspective view of another magnetic head body in the conventional example. 18... Floppy disk, 19.20...
... Magnetic head body, 21, 22 ... Magnetic head section, 23.24 ... Pressing member. Figure 3

Claims (8)

[Claims] (1) Information is recorded on a flexible magnetic recording medium by holding a magnetic head body having at least one pair of non-opposed magnetic head parts against the medium under a predetermined contact pressure from both sides of the medium. The magnetic head body includes a magnetic head portion and a pressing member disposed at a predetermined distance from the magnetic head portion, and a surface of the pressing member that is in sliding contact with the medium is On the other hand, in the magnetic head body of the magnetic recording and reproducing device, in which the top of the magnetic head unit is arranged to protrude by a predetermined amount, the magnetic head body is arranged between the magnetic head unit and the other side with the medium interposed therebetween. If the distance from the magnetic head section is b, and the distance between the magnetic head section and the pressing member closer to itself is a, then a and b satisfy the condition b/2≦a≦b. A magnetic recording and reproducing device. (2) A magnetic recording/reproducing device according to claim 1, wherein the pressing member is installed in a substantially annular shape, and a magnetic head section is installed inside the pressing member. (3) The magnetic recording and reproducing device according to claim 1, wherein a nonwoven fabric is provided on the sliding surface of the pressing member that contacts the magnetic recording medium. (4) A magnetic recording and reproducing device according to claim 1, wherein the pressing member is installed linearly in the tangential direction of the track of the magnetic recording medium. (5) The magnetic recording and reproducing device according to claim 1, wherein the pressing member is installed linearly in the normal direction of the track of the magnetic recording medium. (6) A magnetic recording/reproducing device according to claim 1, wherein a ceramic material is used for the sliding surface of the pressing member with the magnetic recording medium. (7) The magnetic recording/reproducing device according to claim 1, wherein a resin material is used for the sliding surface of the pressing member with the magnetic recording medium. (8) A magnetic recording/reproducing device according to claim 7, wherein the resin material is a resin material containing microparticles of polytetrahololoethylene.