JPS619869A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain always a good head touch by providing a head sliding member where a taper face inclined with respect to the recording face of a magnetic sheet is formed on the side face. CONSTITUTION:A taper face 51 whose one end is close to a magnetic sheet 31 and the other end is inclined to get away gradually from the recording face of the magnetic sheet 31 is formed on the side face, which faces the recording face of the magnetic sheet, of a base body consisting of a rigid body of a nonmagnetic metal or the like of a head sliding member 33, and a space 52 where a magnetic head 32 is set is provided in the center part. When the magnetic sheet 31 is rotated and driven in a high speed, a negative pressure is generated between the taper face 51 and the magnetic sheet 31 by an air flow accompanied with rotation. The magnetic sheet 31 is attracted to the taper face 51 and is bent by the negative pressure. Thus, the magnetic sheet 31 is stably brought into contact with the front end part of the magnetic head 32.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a magnetic recording and reproducing device using a disk-shaped magnetic recording medium (hereinafter abbreviated as magnetic sheet) as a recording medium.
In particular, the present invention relates to improvements in head sliding contact means for sliding a magnetic head into sliding contact with the recording surface of a magnetic sheet.

[Prior art]

In magnetic recording and reproducing devices that record and reproduce information by sliding a magnetic head against the recording surface of a magnetic sheet, in order to achieve highly reliable and stable recording and reproduction, it is necessary to maintain a stable relationship between the magnetic sheet that rotates at high speed and the magnetic head. Obtaining a good sliding contact condition is a particularly important issue. Conventionally, as head sliding contact means for obtaining this stable sliding contact state, the non-recording surface side of the magnetic sheet is pressed down with a pad made of felt, nonwoven fabric, or the like. However, when felt is used, the degree of entanglement of the fibers is uneven, resulting in unstable sliding contact between the magnetic sheet and the magnetic head.
Friction generates static electricity, which tends to attract dirt and other impurities and damage the sheet. Furthermore, since the pad and the magnetic sheet are always in contact with each other, there is also the problem that the load on the magnetic sheet rotation drive source becomes large.

From the above point of view, a rigid pad as shown in Japanese Utility Model Application Publication No. 59-5046 has been devised. FIG. 6 is a diagram showing the outline thereof. In FIG. 6, 1 is a magnetic sheet, 2 is a magnetic head, and 3 is a rigid pad. As shown in the figure, the rigid pad 3 has a V-shaped groove 3a at a position facing the magnetic head 2, and presses the magnetic sheet 1 against the magnetic head 2 at this V-shaped groove 3a. According to this rigid pad 3, by appropriately selecting the shape of the V-shaped groove 3a, an air film is formed between the rigid pad 3 and the magnetic sheet 1 by the air flow accompanying the rotational movement of the magnetic sheet 1 in the direction of the arrow. As a result, the magnetic sheet 1 is not damaged, and the load torque is smaller than that of a pad made of felt or the like. However, in the rigid pad 3 having the above configuration, if an air film is not formed when the rotation starts and when the rotation is stopped, the rigid pad 3 comes into strong contact with the magnetic sheet 1, and there is a risk of damaging the magnetic sheet 1. Furthermore, if the stopped state continues for a long time, there is a possibility that the magnetic seams 1 to 1 will be locally plastically deformed. Furthermore, the magnetic head 2 and the rigid pad 3 form the magnetic sheet 1.
Therefore, when replacing the magnetic sheet 1, the rigid pad 3 must be separated from the magnetic head 1 by some mechanism and then repositioned. Therefore, the structure is complicated, and the re-set position is likely to be misaligned, making it difficult to obtain stable head contact with the magnetic sheet.

Therefore, the present applicant has proposed that there is no increase in load torque due to friction, there is no risk of damaging the magnetic sheet at the time of starting and stopping rotation, and furthermore, there is no risk of damaging the magnetic sheet due to the contact of the magnetic head or pad during the stop period. He devised a head sliding contact method that was completely free of plastic deformation and fatigue, and was granted a patent application in 1973.
An application has already been filed as No. 9-74299.

FIGS. 7(a) and 7(b) are diagrams showing the outline thereof.

4A is a diagram showing a state in which the rotation of the magnetic sheet 11 is stopped, and FIG. 2B is a diagram showing a state in which the magnetic sheet 11 is rotating, that is, a state during recording and reproduction.

The head sliding contact member 13 shown in FIGS. 7(a) and 7(b) is formed of a rigid body such as a non-magnetic metal, and has a side surface facing the recording surface of the magnetic sheet 1-11. 1. Second
It has tapered surfaces 21 and 22.

The first tapered surface 21 is inclined in a direction that gradually moves away from the recording surface of the magnetic sheet 11 along recording tracks (not shown) in the magnetic sheets 1 to 11. The second tapered surface 22 is provided so as to be connected to the first tapered surface 21, and is inclined in a direction that gradually approaches the recording surface of the magnetic sheet 11 along the recording track.

Above 1. A magnetic head insertion hole 14 is provided at the connecting position of the second tapered surfaces 21 and 22, that is, at the center (trough) of the member 13. The magnetic head 12 is inserted into the insertion hole 14 with the gap slightly protruding from the valley of the head sliding member 13. Therefore, if the magnetic sheet 11 is currently not rotating, the magnetic sheet i 11 is completely separated from both the head sliding member 13 and the magnetic head 12, as shown in FIG. From this state, when the magnetic sheet 11 is driven to rotate at high speed by a motor (not shown), the air flow accompanying the rotation causes the first portion of the head sliding contact member 13 to rotate. A negative pressure is created in the recess 23 formed by the second tapered surface 21.22. Due to this negative pressure, the magnetic sheet 11 is deflected inward of the recess 23 of the head sliding member 13, and comes into contact with the magnetic head 12 with a predetermined pressure. During steady rotation of the magnetic sheet 11, an air film A is formed between the magnetic sheet h11 and the head sliding member 13, so there is no possibility that the magnetic sheet 11 and the head sliding member 13 will come into contact with each other.

Thus, according to the head sliding contact means shown in FIGS. 7(a) and 7(b), when the rotation of the magnetic sheet 11 is stopped, the magnetic head 1
Since the magnetic sheet 11 is completely separated from 2 and returned to its natural state, the magnetic sheet 11 will not be plastically deformed even if the Nagaoka open/stop state continues, and even when the magnetic sheet 11 starts and ends its rotation. Since the magnetic sheet 11 and the head sliding contact member 13 do not come into contact with each other, there is no risk of damaging the magnetic sheet I.11. Furthermore, since there is no pad etc. on the side opposite to the magnetic head 12, the magnetic sheet
It is also easy to replace.

However, the above head sliding contact means still has the following problems to be solved. Figure 7 (a>(b)
What is shown is a magnetic head 12 and a magnetic head insertion hole 1.
Since there is a gap G between the first
A sufficient amount of force occurs between the tapered surface 21 and the magnetic sheet 11, but only a small amount occurs between the second tapered surface 22 and the magnetic sheet 11. For this reason, the attractive force against the magnetic sheet 11 is not so strong on the second tapered surface 22 that the magnetic sheet 11 rises as shown by the broken line in FIG. 7(b), and the magnetic sheet 11 and the magnetic head There was a risk that contact with 12 would become unstable.

〔the purpose〕

The object of the present invention is to eliminate the increase in load torque due to friction;
There is no risk of damaging the magnetic sheet when starting or stopping rotation, and there is no plastic deformation or fatigue of the magnetic sheet due to contact with the magnetic head or pad during the stop period, and the head slides into contact with the magnetic head. Equipped with a head sliding contact means that can generate negative pressure across the tapered surface even if there is a gap between the head and the member, can stably attract the magnetic sheet, and can always maintain a good head touch. An object of the present invention is to provide a magnetic recording/reproducing device (required for vA). In order to achieve the above object, a head sliding contact member for slidingly contacting a magnetic head with a magnetic sheet is configured as follows. It is characterized by That is, one end of the magnetic sheet is close to the magnetic sheet and the other end is along the recording track direction of the magnetic sheet. A space for mounting a magnetic head is provided at the center of the base body, in which a magnetic head can be mounted such that the head tip protrudes from the center of the tapered surface to face the recording surface of the magnetic sheet. .

〔Example〕

FIGS. 1(a) and 2(b) are diagrams showing a first embodiment of the present invention in which the present invention is applied to an apparatus using a ring-shaped magnetic head for horizontal magnetic recording.

FIG. 1(a) is a longitudinal cross-sectional view showing a state in which the magnetic sheet l~ is stopped rotating, and FIG. 1(b) is a longitudinal cross-sectional view showing the rotating state of the magnetic sheet, that is, the state during recording and reproduction. FIG. 2 is a partially cutaway plan view. Figure 1 (a) (b)
In FIG. 2, 31 is a magnetic sheet, 32 is a magnetic head, and 33 is a head sliding member. magnetic sheet 31
is formed based on polyester with a thickness of 40 μm, and is rotated at 3600 rpm by a motor (not shown). The magnetic head 32 is a magnetic head for horizontal magnetic recording that records and reproduces information on the magnetic sheet 31, and is mounted in a magnetic head mounting space to be described later. The magnetic spatula 11 is fixed to one end of a substrate 41 made of a non-magnetic material, and the center portion of the substrate 41 is attached to the inner wall of a magnetic head mounting space, which will be described later, by a mounting screw 42.

Also, the lead wires 43° 44 of the excitation coil of the magnetic head 32
are connection conductors 45 and 46 deposited on the substrate 41.
is soldered to. The head sliding contact member 33 has one end close to the magnetic sheet 31 and the other end close to the magnetic sheet 31 on one side facing the magnetic sheet recording surface of the base 50 formed of a rigid body such as a non-magnetic metal. A tapered surface 51 is formed so as to gradually move away from the recording surface of the magnetic sheet 31 along the recording track direction of the magnetic sheet 31, and
A magnetic head mounting space 52 is provided at the center of the base body 50. the magnetic head 2b, and the head tip extends from the center of the tapered surface to the magnetic sheet 3.
The magnetic head 32 is formed so as to be able to be mounted so as to protrude opposite to the recording surface 1 .

This device configured as described above has the following effects. First, when the base plate 41 is rotated in the direction shown by the arrow in FIG. 1(a) with the mounting screws 42 slightly loosened, the amount by which the head tip protrudes from the tapered surface 51 changes. Therefore, once the amount of protrusion is adjusted to an appropriate amount, the screw 42 is tightened to fix it in that position. While the rotation of the magnetic sheet 31 is stopped, the magnetic sheet 3 is
1 is completely separated from both the head sliding member 33 and the magnetic head 32, as shown in FIG. 1(a). From this state, when the magnetic sheet 31 is driven to rotate at high speed as shown by the arrow by a motor (not shown), a negative pressure is generated between the tapered surface 51 and the magnetic sheet 31 due to air flow accompanying the rotation. This negative pressure causes the magnetic sheet 31 to move toward the side where the magnetic sheet 31 and the tapered surface are close to each other (the right side in the figure).
It is attracted by the tapered surface 51 and deflects downward in the figure.

FIG. 3 is a diagram showing the principle of the above operation. That is, the third
As shown in the figure, a minute angle θ is applied across a fluid film such as air.
When two members M and N are arranged so as to form a wedge-shaped space, and one of the members M is moved at a speed V as shown by the arrow, fluid dynamics will occur in the space formed by the two members. Above, a predetermined negative pressure is generated. Therefore, one member M
If the member N is a flexible member and the other member N is a fixed member, the flexible member M will be attracted toward the fixed member N with a force corresponding to the magnitude of the velocity V, as shown by the broken line. Note that the hole 52b, which is formed at the center of the tapered surface, is relatively small compared to the area of the tapered surface 31, as shown in FIG. The phenomenon occurs smoothly.

Thus, the magnetic sheet 31 is in stable contact with the tip of the magnetic head 32, as shown in FIG. 1(b). During steady rotation of the magnetic sheet 31, an air film A is formed between the magnetic sheet 31 and the head sliding contact member 33, so there is no risk of pressure contact between the magnetic sheet 31 and the head sliding contact member 33. .

FIG. 4 shows the present invention applied to an apparatus in which perpendicular magnetic recording and reproduction are performed using a magnetic f\rad 2 for perpendicular magnetic recording on a magnetic sheet 61 for perpendicular magnetic recording. It is a figure which shows the 2nd Example of. In addition, Figure 1 (a
) The same parts as in (b) are given the same reference numerals, and detailed explanations are omitted. The magnetic spatula 1-62 for perpendicular magnetic recording, as shown in an enlarged view in FIG. It is the head. In other words, the film thickness is 0.
．． 1~0.5μmPi! The amorphous magnetic film 71 is made of a material 72,73 such as amorphous carbon (product name: Glassy Carbon: Tokai Carbon Co., Ltd.) or crystallized glass (product name: Devitron Niishizuka Glass Co., Ltd.).
The magnetic sheet 6 is held from both sides by
1 is formed into an arc shape with a predetermined curvature, and the amorphous magnetic l! is formed on the other end surface. A yoke 76 made of a magnetic material such as ferrite and having a winding 1i175 is fused to the central magnetic leg 74 which is connected to the center magnetic leg 71.

If necessary, a magnetic material 77 may be placed on the back side of the magnetic sheet 1-61 to improve the recording and reproducing sensitivity, as shown by the broken line in FIG.

This embodiment configured in this manner also has the same effects as the first embodiment, and can perform stable perpendicular magnetic recording and reproducing operations.

Note that the present invention is not limited to the above embodiments.

For example, in the first embodiment, the magnetic head 32 is provided so as to be movable in the radial direction of the magnetic sheet 31 together with the head sliding member 33. hole 52 so that it can be moved to
The shape of 1) may be formed into a rectangular spiral shape that crosses the tapered surface 51 in the width direction. Further, in each of the above embodiments, the first. Second
Although an example is shown in which the tapered surfaces 41 and 42 are flat surfaces, the present invention is not limited to this, and curved surfaces may be used. Furthermore, although the second embodiment shows an example of application to an apparatus using a magnetic head for perpendicular magnetic recording of the main pole excitation type, it is also applicable to an apparatus using a magnetic head for perpendicular magnetic recording of the auxiliary pole excitation type. Of course, it is applicable.

〔Effect of the invention〕

The present invention provides a tapered surface that is inclined such that one end is close to the magnetic sheet and the other end is gradually away from the recording surface of the magnetic sheet along the recording track direction of the magnetic sheet, on one side surface of the base body facing the magnetic sheet. a head sliding contact member having a magnetic head mounting space provided at the center of the base body in which a magnetic head can be mounted such that the head tip protrudes from the center of the tapered surface to face the recording surface of the magnetic sheet; It is prepared.

Therefore, according to the present invention, when the rotation of the magnetic sheet is stopped, the magnetic sheet 1- is completely separated from the magnetic head and returned to its natural state, so that the magnetic sheet will not be plastically deformed even if the open stop state continues for a long time. Furthermore, since the magnetic sheet and the head sliding member do not come into contact with each other when the magnetic sheet starts and ends its rotation, there is no risk of damaging the magnetic sheet, and there are no pads on the opposite side of the magnetic head. Therefore, replacing the magnetic sheet is easy.
In addition, even if there is a gap between the magnetic head and the head sliding member, negative pressure can be generated across the entire Taper surface, the magnetic sheet can be stably attracted, and a good head touch can always be obtained. It is possible to provide a magnetic recording/reproducing device equipped with head sliding contact means.

[Brief explanation of drawings]

1(a), 2(b) and 2 are diagrams showing a first embodiment of the present invention; FIG. 1(a) is a vertical cross-sectional view showing a state in which the magnetic sheet is stopped rotating; (b) Fig. 4 and Fig. 5 are diagrams showing the second embodiment of the present invention, Fig. 6 is a diagram showing an outline of the conventional example, and Fig. 7 (a) and (b) are the prior art by the present applicant. It is a figure showing the contents of an application. 1.11, 31.61... Magnetic sea [to (disk-shaped magnetic recording medium), 2, 12.32. . . . Magnetic head for horizontal magnetic recording, 3 . . . Rigid pad, 13. 33 . . . Head sliding contact member, 21. 22 . Second tapered surface, 14... Head insertion hole, 23... Recess, 41...
・Board 42...Mounting with screws, 50...Base, 51...
... Tapered surface, 52 ... Space for magnetic head mounting, 62
...Magnetic head for perpendicular magnetic recording, 71...Amorphous magnetic film, 75...Winding wire, 76...Yoke. Applicant's representative Patent attorney Atsushi Tsuboi Figure 1 Figure 3 I Figure 4 Figure 5 Figure 6 Figure 7 (a) (b) Procedural amendment 1, Indication of case Patent application No. 1987-59130554 2, Invention Name Magnetic Recording and Reproducing Device 3, Relationship with the person making the amendment Patent applicant (037) Olympus Optical Industry Co., Ltd. 4, Agent 17 Mori Building 5, 1-26-5 Toranomon, Minato-ku, Tokyo,
Voluntary amendment 7, contents of amendment (1) If E is rotated on page 11, line 13 of the specification.”
Correct it to ``When you move it.'' (2) In the drawings, Figures 1 and 4 will be corrected as shown in the attached sheet.

Claims (4)

[Claims] (1) A disk-shaped magnetic recording medium that is rotationally driven by a motor, a magnetic head that records and reproduces information on this recording medium, and a head sliding contact member that brings this magnetic head into sliding contact with the recording medium. The head sliding contact member has a tapered surface inclined toward the recording medium so that one end approaches the recording medium and the other end gradually moves away from the recording surface of the recording medium along the recording track direction of the recording medium. A base body formed on one side facing each other, and a magnetic head mounting provided at the center of the base body to which the magnetic head can be attached such that the head tip protrudes from the center of the tapered surface to face the recording surface of the recording medium. 1. A magnetic recording and reproducing device comprising: (2) The magnetic recording/reproducing device according to claim (1), wherein the base body is provided so as to be movable in a direction across the recording track together with the magnetic head. (3) The magnetic head according to claim (1), wherein the magnetic head mounting space is a hole having a size that allows the magnetic head to be moved and adjusted in the direction of the recording track and/or in the direction across the recording track. Recording and playback device. (4) The magnetic recording and reproducing apparatus according to claim (1), wherein the magnetic head is a magnetic head for perpendicular magnetic recording using an amorphous magnetic film as a magnetic pole.