JPS59215073A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To suppress face deflection of a medium and to obtain stable contact pressure by providing incorporatedly the 1st pad member to a magnetic head before and after the magnetic head along the running direction of the magnetic recording medium and providing the 2nd pad member with press contact onto a position opposite to the other side face. CONSTITUTION:Since the medium is clipped with a couple of pad members 13A, 13B and other couple of pad members 14A, 14B at a position before and after a magnetic head 11 along the rotating direction of a disc 2 being the medium running direction, the face deflection of the medium near the magnetic head 11 is suppressed effectively. Since the amount (d) of projection of a tip of the magnetic head 11 to a medium recording face 2a is set by the amount of head projection from a medium contact face of the pad members 13A, 13B, a high mechanical accuracy is attained and the head contact pressure is also set with high accuracy. Even if the clipping force of the medium by the pad members 13A, 13B and 14A, 14B is set to a value suppressing sufficiently the face deflection, since no direct application of pressing force to the magnetic head 11 exists, the head contact pressure is not increased and damages to the medium and the head are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing apparatus for recording/reproducing signals on/from a magnetic recording medium such as a rotating magnetic track using a magnetic head.

[Background technology and its problems]

When recording and reproducing signals using a magnetic head on a sheet-like magnetic recording medium housed in a case or jacket, such as a so-called flexible disk, it is important to maintain a constant contact pressure between the recording medium surface and the magnetic head. However, if this contact pressure fluctuates or a non-contact state occurs, the strength of the recording/reproducing signal changes and recording/reproducing cannot be performed effectively.

Therefore, in the past, a pad was provided at a position facing the magnetic head with the magnetic recording medium in between, and the pad was pressed against the magnetic head with a constant pressure, thereby allowing the magnetic recording medium and the magnetic head to interact. Structures that maintain a constant contact pressure are often used.

However, if the sheet-like magnetic recording medium has high rigidity and there is no flat dust, a large "face runout" will occur at the head position when the sheet-like recording medium rotates, and it will resist the pressing force of the pad. This causes an adverse effect such as the surface of the medium rising above the head, making it impossible to perform good recording and reproduction. This is especially true in the case of perpendicular magnetic recording media, in which a metal film made of a cobalt chromium alloy or the like is deposited on a polymer film by sprocketing, so it has high rigidity and is heated to temperatures of about 100 to 150°C during the sputtering process. Due to internal stress caused by heat treatment at a temperature of Become.

Therefore, it is conceivable to increase the pressing force of the pad facing the magnetic head to prevent the cartridge-shaped medium from floating above the head, but if the pressing force is large, the contact pressure between the medium and the head will also increase. If the direction of the above-mentioned "surface runout" is toward the magnetic head side, the contact pressure will further increase, resulting in adverse effects such as damage to the magnetic layer of the recording medium and increased wear on the magnetic head. occurs, which is not desirable.

[Purpose of the invention]

In view of such conventional circumstances, the present invention has been developed to provide a highly rigid and
Even when performing magnetic recording and reproduction on a No. 1-shaped magnetic recording medium with warpage, it is possible to suppress the lateral runout of the medium without increasing the contact pressure of the recording medium against the magnetic head, and to maintain a certain level of The purpose of the present invention is to provide a magnetic recording/reproducing device that can obtain stable contact pressure.

[Summary of the invention]

That is, the magnetic recording and reproducing apparatus of the present invention is characterized in that the magnetic recording and reproducing apparatus records and reproduces signals using a magnetic head while rotating and driving a No. 1-shaped magnetic recording medium such as a flexible magnetic disk housed in a case. For example, a first pad member that contacts one surface of the magnetic recording medium at front and back positions of the magnetic head along the running direction of the magnetic recording medium is provided integrally with the magnetic head, and A second pad member is provided which abuts at a position opposite to the first pad member on a surface opposite to the above-mentioned - surface.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an example of a magnetic recording medium used in the present invention. In this Figure 1, a jacket or case 1 made of plastic snacks etc.
A flexible magnetic disk 2, which is a circular sheet-shaped magnetic recording medium that is rotated in the direction indicated by the arrow, is housed inside. The case 1 is provided with an elongated hole 3 for guiding the head, the length of which is in the radial direction of the disk (in the direction of arrow B), within a range inside the outer peripheral edge of the magnetic disk 2 . That is, the distance l from the center P of the magnetic disk 4 to the disk radial outer edge Q of the oblong hole 3 is set smaller than the radius R of the magnetic disk 2 (A<l). The center of the magnetic disk 2 is reinforced by a circular core metal 5, and protrusions (not shown) of a rotary drive stand are inserted into holes 6, 7, etc. drilled in the core metal 5. The magnetic disk 2 is driven to rotate in the direction of arrow A.

Next, a magnetic head for magnetic recording and reproduction is inserted through the oblong hole 3 and comes into contact with the surface of the magnetic disk 2.

FIG. 2 is a schematic cross-sectional view 47 showing the vicinity of the magnetic head section of the magnetic recording/reproducing apparatus according to the first embodiment of the present invention. In FIG. 2, a magnetic head 11 is mounted and fixed on a support base 12, and the tip of the magnetic head 12 is inserted through the oblong hole 3 of the case 1 to record information on the flexible magnetic disk 2. It is in contact with the surface 2a. The magnetic disk 2 rotates in the direction of the arrow, and a pair of first pad members 1 abut against the recording surface 2a of the magnetic disk 2 at the front and rear positions of the magnetic head 11 along the medium running direction A.
3A and 13B are mounted and fixed on the support base 12 and are configured integrally with the magnetic head 11. The planar shapes of the pad members 13A, 13B and the magnetic head 11 appear, for example, as shown in FIG.
The pad members 13A and 13B are each mounted and fixed on the support base 12 so that the longitudinal direction thereof is arranged in the direction of arrow B perpendicular to the medium movement direction A, and the magnetic head 11 is arranged at an intermediate position between these pad members 13A and 13B. has been done. Next, the surface 2 of the magnetic disk 2 opposite to the recording surface 2a which is the head contact surface.
The pair of first pad members 13A and 13B in b
A pair of second pad members 14A and 14B are in contact with each other at positions facing each other, and these pad members 1
4A and 14B are taken up by the support member 15. Note that each of the pad members 13 and 14 may be made of felt,
Alternatively, it is better to use aluminum flock material with non-woven fabric attached. Further, on the contact surface with the disk inside the case 1, slippery sheets made of nonwoven fabric or the like, so-called linens 1 and 4, are interposed to reduce friction when the magnetic disk 2 is driven to rotate.

By the way, this embodiment assumes an apparatus for performing perpendicular magnetic recording and reproduction, and the magnetic disk 2 and magnetic head 11 used have a structure as shown in FIG. 4, for example.

In FIG. 4, the magnetic tape 2 as a magnetic recording medium has a high magnetic permeability layer made of Ni--Fe, Soker ferrite, etc. on one side of a flexible substrate 21 made of a polymer film such as polyimide or sheet 1-. 22, and C
Perpendicular magnetization layer 2 made of o-Cr (cobalt-chromium) or the like
3 was sequentially deposited and formed. The main magnetic pole 27 of the magnetic head 1 is arranged, and the W-shaped core 26
A coil 28 is wound around the central portion where the main magnetic pole 27 is provided, and a non-magnetic member 29 is arranged on the medium facing surface of the head.

Such a magnetic head 11 is configured to be movable in a direction perpendicular to the surface of the magnetic tape 2 (in the direction of arrow C in FIG. 2) together with a support base 12 and pad members 13A and 13B, and is capable of recording. The medium contact position shown in the solid line in Figure 2 for playback, and the second
The standby position shown in the imaginary line in the figure can be selectively taken. Further, the structure consisting of the magnetic head 11, pad members 13A, 13B, and support base 12 is moved along the radial direction of the magnetic disk 2 (in the direction of arrow B), for example, using a Stellapin 1gmoke ( (not shown), etc., and the magnetic head 11
is guided in the oblong hole 3, and a concentric or spiral tracking locus is drawn with respect to the rotating magnetic disk 2.

On the other hand, 14T3 is also attached to the pad member 14 at a contact position (solid line in FIG. 2) and a relief position (solid line in FIG. 2) with respect to the magnetic disk 2, which is a medium.
(phantom line in Fig. 2), and is configured such that a predetermined pressing force is applied, for example, by an appropriate spring material (not shown) at the opposing position. . The pressing force at this time is received by the pad members 13A and 13B on the magnetic head side via the magnetic disk 2,
It is not applied directly to the magnetic head 11. Further, the pad members 14A and 14B move in the radial direction of the magnetic tape 2 (in the direction of arrow B) in conjunction with the radial movement of the magnetic head 11 described above, and are always in a facing positional relationship with the pad members 13A and 13B. It is designed to be maintained.

And pad members 13A, 13B and 14A.

14 and B, the magnetic disk 2 is clamped by the predetermined pressure, preventing the disk from being photographed on one side when the disk is rotated, and the vertical position of the disk surface in the vicinity of the head is kept constant. With respect to this reference disk surface position, especially the recording surface 2a position, the magnetic head 11
is set so that it protrudes by a predetermined amount d. At this time, the contact pressure of the magnetic head 11 against the recording surface 2a of the magnetic disk 2 is approximately determined according to the head protrusion amount d.

The clamping between 13B, 14A, and 14B is hardly affected by pressure.

According to an embodiment of the present invention having the above-described configuration as a main part, magnetic recording and reproduction are performed on a medium such as a sheet-like perpendicular magnetic recording medium that has relatively high rigidity and is prone to "warpage". In this case, a pair of pad members 13A are placed at front and rear positions of the magnetic head 11 along the rotational direction (arrow hole direction) of the magnetic disk 2, which is the medium running direction, in the vicinity of the magnetic head contact portion.

Since the medium is sandwiched between the pad members 13B and the other pair of pad members 14A and 14B, "surface wobbling" of the medium near the magnetic head 11 can be effectively suppressed. At this time, the amount of protrusion d of the tip of the magnetic head 11 relative to the medium recording surface 2a is set by the amount of head protrusion from the medium contact surface of the pad members 13A and 13B. Can be set with high precision. Furthermore, even if the force of sandwiching the medium between the pad members 13A, 13B and 14A, 14B is set to a level that can sufficiently suppress the above-mentioned "surface runout," there is no direct pressing force against the magnetic head 11. Since there is no application, there is no increase in head contact pressure, and damage to the medium and head can be prevented. In addition, since the pad members 13A, 13B and 14A, 14B move in conjunction with the radial movement of the head, there is no need to provide any members in advance over the entire movement range, and the area of the medium is always kept to the minimum necessary. By sandwiching the parts, it is possible to effectively suppress "one-plane runout near the head" and avoid increasing media rotation and drive torque more than necessary.

Next, FIG. 5 shows a main part of a second embodiment of the present invention, and shows an example in which a head pad 16 is disposed at a position facing the magnetic head 11. In this second embodiment, with respect to the medium surface position of the flexible magnetic disk 2, etc.,
The head pad 16 is configured to protrude. Correspondingly, the tip of the magnetic head 11 is disposed lower than the medium surface position. Since the other configurations are the same as those of the first embodiment described above, corresponding parts are given the same reference numerals and explanations will be omitted.

According to this second embodiment, since the head pad 16 is made to protrude from the medium reference surface (relative to which the head does not protrude), the contact pressure to the head during rotational movement of the medium can be reduced, and the medium and can extend the life of the hand.

Next, FIG. 6 shows a main part of a third embodiment of the present invention, in which the function of a pad member on the side of the magnetic head 11 is realized by a liner sear 1-4a inside the case 1.

That is, in FIG. 6, the lower half 1a and upper half 1b of the disk case 1 are provided with the aforementioned oblong holes 3a and 31 for guiding the movement of the magnetic head, respectively. However, these oblong holes 3a
, 3b, the width of the oblong hole 3a on the side into which the magnetic head 11 is guided and inserted (the width in the traveling direction A of the medium 11) is formed to be shorter than the width of the other oblong hole 3b. A liner seam 1-48 is provided between the flexible magnetic disk 2 and the lower half 1a, and the front and rear positions in the medium running direction A with respect to the magnetic head 11 at the peripheral part ζ of the oblong hole 3a of the lower half 1a are provided. The liner sheet 4a is used as a head side pad member. The other pad members 14A and 14Bl may be constructed in the same manner as in the first embodiment described above, and move in the same direction in conjunction with the movement of the magnetic head 11 in the disk radial direction.

The third embodiment has the advantage that the structure of the pad member on the magnetic head 11 side is simple.

Furthermore, the structure of the head-side pad member of this third embodiment can also be applied to the second embodiment, which is shown in FIG. 7 as a fourth embodiment of the present invention. The configuration of each part in FIG. 7 is the same as in the second and third embodiments described above, so corresponding parts will be given the same reference numerals and explanations will be omitted.

Although the pad members 13A, 13B, 14A, and 14B in each of the above embodiments have a rectangular planar shape, they may also be configured in an annular shape as in the fifth embodiment shown in FIGS. 8 and 9. . That is, FIG. 8 shows the first pad member 31 on the magnetic head 11 side, and FIG. 9 shows this pad member 31.
A second pad member 32 is shown which faces the magnetic disk 2 with the magnetic disk 2 interposed therebetween, and both have an annular planar shape centered on the head position. The other parts may be constructed in the same manner as in the first embodiment described above.

According to this fifth embodiment, in the vicinity of the periphery of the magnetic head 11, not only the front and rear positions of the head along the medium running direction, that is, the magnetic disk rotation direction A, but also the inner and outer positions of the head along the disk radial direction Also, the vertical position can be regulated by clamping the magnetic disk, and the above-mentioned "surface runout" can be more effectively prevented.

Further, as in the sixth embodiment of the present invention shown in FIG.
The pad/nod member 14 of the second embodiment described above may be formed in an annular shape, and in FIG. 10, the magnetic head 1
The annular pad member 32 is arranged around the head pad 16 facing the head pad 1 . The planar shape of the pad portion on the hand side appears similar to that shown in FIG. 8 above. Since the other configurations are the same as those of the second embodiment described above, they are not shown and the explanation will be omitted.

〔Effect of the invention〕

As is clear from the above description, according to the magnetic recording and reproducing apparatus according to the present invention, the recording medium is placed between the first pad member and the second pad member at least at the front and back positions along the medium running direction of the magnetic head. Because it is held between the
Even when performing magnetic recording and reproduction on media that are prone to warping, this method effectively prevents vertical position fluctuations of the medium such as "shake" without extremely increasing the contact pressure between the magnetic head and the medium. It's coming up.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a flexible full magnetic disk and case as a magnetic recording medium used in the magnetic recording/reproducing apparatus of the present invention, and FIG. 2 is a schematic sectional view showing the main parts of the first embodiment of the present invention. 3 is a plan view showing the pad member on the magnetic head side in FIG. 2, FIG. 4 is a schematic perspective view for explaining the principle of perpendicular magnetic recording, and FIG. 5 is a summary of the second embodiment of the present invention. FIG. 6 is a schematic sectional view showing the main parts of the third embodiment of the present invention. FIG. 7 is a schematic sectional view showing the main parts of the fourth embodiment of the invention. 8 and 9 are schematic plan views showing a fifth embodiment of the present invention, and FIG. 10 is a schematic plan view showing a sixth embodiment of the present invention. 2...Flexible/pull magnetic disk 11...Magnetic heads 13A, 13B, 31...First pad member 1
4A, 14B, 32...Second pad member patent applicant Sony Corporation representative Patent attorney Kodo Koike 1) Sakae Mura - =643 Figure 8 Figure 9 Figure 10 Figure 10 645-

Claims (1)

[Claims] In a magnetic recording and reproducing apparatus that records and reproduces signals on a rotationally driven sheet-shaped magnetic recording medium using a magnetic head, the magnetic recording medium is at least at the front and rear positions of the magnetic head along the running direction of the magnetic recording medium. A first pad member that contacts the recording surface, and a second pad member that contacts the first pad member on a surface opposite to the recording surface of the magnetic recording medium at a position opposite to the first pad member. A magnetic recording/reproducing device characterized by comprising: