JPH0469856A - Magnetic head supporting device - Google Patents

Abstract

PURPOSE:To stably write and/or read a signal by always optimizing the negative pressure state in a first recessed part which supports a magnetic head of a magnetic head supporting body. CONSTITUTION:Since a first groove 9 connecting a first recessed part 5 and a second recessed part 6 is provided above a first annular projection 3 at a upstream side in the disk rotating direction, air in the first recessed part 5 flows out from the first groove 9 to the second recessed part 6to make the negative pressure state in the first recessed part 5. Therefore, a disk is sucked to the magnetic head supporting device side by this negative pressure and is brought into contact with the magnetic head. At this time, the head pressing force with which the magnetic head presses the disk is dependent upon the repulsion of the disk and this negative pressure but is considerably dependent upon the negative pressure. Consequently, the head pressing force is always kept constant regardless of the change of rigidity of the disk.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic head support used in a magnetic disk drive device that records and/or reproduces information on a disk-shaped magnetic recording medium. Regarding equipment.

[Prior Art] A magnetic disk drive device that records/reproduces information on a disk-shaped magnetic recording medium (hereinafter simply referred to as a disk) is used as an external storage device for information processing devices such as computers and word processors. It is now widely used as a device.

One of these information processing devices records/records still image signals.
There is something called a still video floppy disk drive for playback. This disk drive is a small device that uses a 2-inch diameter floppy disk, and is installed in a still video floppy camera. Image information is recorded on the still video floppy disk using the same operation as a camera device using photosensitive film. It is supposed to be done.

An example of this type of still video floppy disk drive device is one disclosed in Japanese Patent Laid-Open No. 63-229662 by the present applicant. The invention related to this conventional example provides a magnetic disk drive device including: a magnetic head support that supports a magnetic head in a protruding state within a recess; This structure does not include a regulating means for regulating the maximum separation distance of the disk from the head.However, if the recess is used to attract the disk in this way, in extreme cases, the disk may become attached to the magnetic head support. In order to improve this problem, the present applicant has proposed a method of forming an annular protrusion that forms the inside of a concave portion in order to improve this problem. proposed an invention in which suction force is controlled by providing grooves that connect adjacent spaces.

This will be explained specifically. Figure 3 shows magnetism related to the existing proposal)
\It is a plan view of the Rad support. In the figure, a magnetic head support 11 is formed into a disk shape in plan view. A magnetic head 12 on which a gear knob 12a is formed protrudes from the center, and one annular projection 1 is provided on the inner and outer circumferences.
3.14 are formed concentrically. From now on, the second
inside the annular protrusion 14 and between the first annular protrusion 13 and the second annular protrusion 14 (respectively, the first recess 1
5 and a second recess 16 are formed. In this example, each of the annular protrusions 13 and 14 protrudes from the surface of each concave portion 15 and 16 by approximately 30 to 40 μm, and the surface thereof is formed into a flat shape. ) on the downstream side, said first and second annular protrusions 13.1;
4, that is, the first recess 15
and the second recess 16 and the outside of the magnetic head support 11 and the second recess 16 are i! The opposite first and second lines 17 and 18 are deleted.

When the magnetic head support 11 is configured in this manner, when the disk is rotated at high speed along the upper surface of the magnetic head support 11, negative pressure is created in the first recess 15 and the second recess 16. This causes the disk to move to the magnetic head support 11.
It is attracted to the upper surface side of the magnetic head, deforms along the unevenness of the magnetic head support 11, and slides into the gap of the magnetic head 12 under a predetermined load pressure. This makes it possible to write or read signals. In the process of writing/reading, when the negative pressure in the first and second recesses 15.16 increases due to the above-mentioned suction, the first and second annular shapes increase depending on the height of the negative pressure. Air outside the magnetic head support 11 enters into the first and second recesses 15.16 through the first and second edges 17.1g cut out by the protrusions 13.14, creating a negative pressure. Automatically control so that it does not become too high. That is, eraser 17.18 as above.
By providing this, it is possible to prevent the disk from sticking and to always obtain an appropriate load pressure.

[Problems to be Solved by the Invention] However, when the magnetic head support disclosed in the above-mentioned conventional example is used in various types of heads, it is difficult to match the deformed shape of the disk and the shape of the head tip due to differences in the head tip shape. The first and second annular protrusions 13
．． It is necessary to change the setting of the height of the head tip with respect to 14.

However, in the case of the above conventional example, the depth of the first recess 15 is 30.about.40 A1 m, and the negative pressure generated here is affected by the distance between the disk and the bottom of the first recess 15. There is a problem in that the height of the head tip, which is one of the factors that determines the height of the running disk, cannot be freely set.

In addition, the distance between the running disk and the bottom of the first recess 15 changes due to differences in rigidity between the inner and outer circumferential sides of the disk, variations in the disk itself, and differences in rigidity due to changes in temperature and humidity. A similar problem occurs.

Therefore, both the depth dimensions of the first and second recesses 15.16 relative to the first and second annular protrusions 13.14 must be manufactured with high precision, which makes it difficult to manufacture the magnetic head support 11. It was supposed to make it difficult and limit the manufacturing method.

The present invention has been made in view of the above-mentioned state of the prior art, and its purpose is to maintain a constant head pressing force of the magnetic head at all track positions on the disk surface and to stably write and/or read signals. The object of the present invention is to provide a magnetic head support device that is possible.

[Means for Solving the Problems] The above object is to provide a magnetic head and a magnetic head support that supports the magnetic head in a protruding state at the center position of a first recess defined by a first annular projection. The magnetic disk is brought close to a flexible magnetic disk that rotates at high speed and has a body, and a negative pressure is generated in the first recess to draw the magnetic disk in, and the magnetic disk is opposed to the gap of the magnetic head. In the magnetic head support device, the magnetic head support includes a second annular protrusion formed on an outer edge;
a second recess defined by the second annular projection and the first annular projection, the first recess being deeper than the second recess; A first arm is provided on the upstream side of the first annular protrusion in the direction of rotation of the magnetic disk to communicate the first recess and the second recess, and the second annular protrusion This is achieved by providing a second groove that communicates the second recess with the outside of the magnetic head support on the downstream side in the rotational direction of the magnetic disk.

[Operation] According to the above means, since the first groove communicates with the second recess, the air in the first recess is sucked into the second recess. , the negative pressure in the first recess is determined only by the negative pressure generated in the second recess. Therefore, it is only necessary to manage the depth dimension of the second recess,
Manufacture of the magnetic head support becomes easy.

Moreover, since the first recess is formed deeper than the second recess, even if the distance between the traveling disk and the first recess changes due to differences in the height of the head tip or the rigidity of the disk, the occurrence of The negative pressure generated hardly changes, so the head pushing force also does not change, and a stable head output is always obtained.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of the main body of the magnetic head support device according to this embodiment, and FIG. 2 is a sectional view taken along the line 1--1 in FIG. In FIG. 1, first and second annular protrusions 3.4 are formed concentrically on the magnetic head support 1, and the first annular protrusion 3 on the inner circumferential side is arranged in the disk rotation direction ( Illustrated arrow A
Direction) On the upstream side, there is a first recess 5 defined by the first annular protrusion 3 and a second recessed part 5 defined by the first annular protrusion 3 and the second annular protrusion 4. A first arm 9 is formed which communicates with the concave portion 6 . Further, on the downstream side in the disk rotation direction of the second annular projection 4 on the outer circumferential side, a second annular projection 4 is provided.
A second groove that communicates between the concave portion 6 and the outside of the magnetic head support 1
A wave 8 is formed.

Furthermore, a third arm 7 is formed on the downstream side of the first annular projection 3 in the disk rotational direction to communicate the first recess 5 and the second recess 6.

In the valley groove, the diameter of the magnetic head support 1 is 6.8 cm, and the outer diameter and inner diameter of the second annular protrusion 4 are 6.4 cm, respectively.
+u+, 6.0+u+, the outer diameter and inner diameter of the first annular protrusion 3 are 4.8 am and 4.4 mm, respectively, and the first and second recesses of the first recess 5 and the second recess 6 are The amount of depression from the top surface of the annular protrusion 3.4 is 200 μm and 4, respectively.
0 μm, the groove width w1 of the first groove 9 is 1.2 μm, the ridge depth hl is 200 μm, and the groove width w2 of the second groove 8 is 1.2 μm.
2 m+a, the arm depth h2 is set to 40 μm, the groove width w3 of the third arm 7 is set to 1.2 m+a, and the arm depth h3 is set to 40 μm. Note that the hole 2 shown in FIGS. 1 and 2 is a mounting hole for mounting a magnetic head.

In the magnetic head support device configured as described above, the first
Since the first arm 9 that communicates the first recess 5 and the second recess 6 is provided on the upstream side of the annular projection 3 in the disk rotation direction, the inside of the first recess 5 is Since the air flows out from the first bank 9 to the second recess 6, the inside of the first recess 5 becomes in a negative pressure state. Therefore, the disk is attracted toward the magnetic head support device by this negative pressure and comes into contact with the magnetic head. At this time, the head pressing force by which the magnetic head presses the disk is due to the repulsive force of the disk and the aforementioned negative pressure, but this negative pressure is considerably larger.

You will be highly dependent on it. Therefore, it is possible to always obtain a constant throat pressing force even when the rigidity of the disk changes. Further, a second arm 8 formed on the downstream side of the second annular protrusion 4 in the disk rotation direction allows the magnetic head support 1
The outside and the second recessed portion 6 are i! ! 3ffi, so that the inside of the second recess 6 does not become in an excessively negative pressure state.Furthermore, by providing the third arm 7 on the downstream side of the first annular projection 3 in the disk rotation direction, In this embodiment, the negative pressure in the first concave portion 6 can be set to an appropriate level, and an RM contact state between the magnetic head and the disk can be obtained. of? s9, second wave 8
By installing the third arm 7 in addition to the above, a suitable negative pressure state 17 is achieved in the first recess 5. However, due to the difference in the design 1 of the dimensions of each part of the magnetic head support 1, 1st stream 9
If the optimum negative pressure state in the first recessed part 5 can be obtained only with the second groove 8, there is no need to intentionally provide the third vent. Position 11. on the flow side in the rotational direction of the first annular projection 3. There is no restriction on the number of banks or the width of the banks.

[Effects of the Invention] As is clear from the above description, according to the magnetic head support device having the above configuration, the negative pressure in the first recessed portion of the support body supporting the magnetic head is reduced. Since the state can always be optimally maintained, the head pressing force of the magnetic head is constant at all track positions on the disk surface, and the magnetic head is able to write and/or read stable signals. A support device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a magnetic head support device according to the present invention, and FIG. 2 is a sectional view taken along the line 1-1” in FIG. 1. FIG. 3 is a plan view of a conventional magnetic head support device. ...Magnetic\rad support, 3...First annular protrusion,...Second annular protrusion, 5...First recess,...Second recess, 7
...Third Qing, ...Second. No erasure, 9...First ditch construction 7 Figure 81/-------ゝ＼ Figure 2

Claims (2)

[Claims] (1) It has a magnetic head and a magnetic head support that supports the magnetic head in a protruding position at the center of a first recess defined by a first annular protrusion, and is capable of rotating at high speed. The first disk is placed close to a flexible magnetic disk.
In the magnetic head support device, the magnetic head support device generates negative pressure in the recessed portion of the magnetic head to draw in the magnetic disk and opposes the magnetic disk to the gap of the magnetic head. and a second recess defined by the second annular projection and the first annular projection, and the depth of the first recess is equal to the depth of the second recess. is formed deeper than the depth, and on the upstream side of the first annular projection in the rotational direction of the magnetic disk,
A first groove communicating between the first recess and the second recess is provided, and the second recess is connected to the outside of the magnetic head support on the downstream side of the second annular protrusion in the rotational direction of the magnetic disk. A magnetic head support device characterized in that a second groove is provided that communicates with the magnetic head support device. (2) On the downstream side of the first annular protrusion in the rotational direction of the magnetic disk, there is a third concave portion that communicates with the first concave portion and the second concave portion.
2. The magnetic head support device according to claim 1, further comprising a groove.