JP2728752B2 - Magnetic head support device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a magnetic head support device used in a magnetic disk drive for recording and / or reproducing information on a magnetic recording medium formed in a disk shape. About.

[Conventional technology]

A magnetic disk drive for recording / reproducing information on / from a magnetic recording medium formed in a disk shape (hereinafter, simply referred to as a disk) is currently used as an external storage device of an information processing device such as a computer or a word processor. Is widely used.

One of these information processing apparatuses is called a still video floppy disk drive for recording / reproducing a still image signal. This disk drive device is a small type using a 2 inch diameter floppy disk, and is mounted on a still video floppy camera. Image information is stored on the still video floppy disk by the same operation as a camera device using a photosensitive film. Is to be recorded.

An example of this type of still video floppy disk drive is disclosed by the present applicant in Japanese Patent Application Laid-Open No. 63-229662. The invention according to this conventional example is a magnetic disk drive, wherein a magnetic head support for supporting the magnetic head in a state of protruding in the recess is provided at a position facing the support via the disk. And a restricting means for restricting the maximum separation distance of the disk from the disc. However, if the disk is sucked by using the concave portion in such a case, in an extreme case, the disk may be abnormally adsorbed to the magnetic head support and may not even be able to rotate the disk. As shown in FIGS. 5 and 6, an outermost annular projection (hereinafter referred to as a ridge) forming a concave portion is provided with a space defined by the ridge and the outside of the magnetic head support. A structure is conceivable in which a communicating groove is provided to control the suction force.

This will be described specifically. FIG. 5 is a plan view of the magnetic head support according to the proposal, and FIG. 6 is a sectional view taken along the line BB 'of FIG. In these figures, the magnetic head support 1
Is formed in a disk shape in a plan view, a magnetic head 2 having a gap 2a is formed at a central portion thereof, and two ridges 3, 4 are formed concentrically at an inner peripheral portion and an outer peripheral portion. ing. As a result, a first concave portion 5 and a second concave portion 6 are formed inside the first ridge 3 and between the first ridge 3 and the second ridge 4, respectively. In the case of this example, the first and second ridges 3 and 4 have a protrusion amount d ₃ from the surface of each of the concave portions 5 and 6 as d ₃ =
It protrudes by about 80 μm, and its surface is formed in a planar shape. The space defined by the first and second ridges 3 and 4, that is, the second recess 6 and the magnetic head support 1 are located downstream of the disk rotation direction (the direction of arrow R in the drawing).
A groove 7, which communicates with the outside, is cut.

When the magnetic head support 1 is configured as described above, when the disk is rotated at a high speed along the upper surface of the magnetic head support 1, the first concave portion 5 and the second concave portion 6 become negative pressure. As a result, the disk is sucked into the upper surface side of the magnetic head support 1 and deforms along the irregularities of the magnetic head support 1, and slides on the gap of the magnetic head 2 at a predetermined load pressure. Thus, writing or reading of a signal becomes possible. And in the process of writing / reading,
When the negative pressure in the first and second concave portions 5 and 6 increases due to the suction, the second ridge 4 is formed in accordance with the level of the negative pressure.
The air outside the magnetic head support 1 intrudes into the second recess 6 through the groove 7 which is cut into the groove 7 so as to automatically control the negative pressure so as not to become too high. That is, the provision of the groove 7 as described above makes it possible to suppress abnormal adsorption of the disk.

[Problems to be solved by the invention]

However, in the above-mentioned conventional example, although the pressure in the recess 6 can be controlled by the groove 7, the recess 5 in which the magnetic head 2 is supported can be controlled by suction of the disk by negative pressure.
Since the disk is still kept in a sealed state, abnormal adsorption of the disk cannot be completely prevented.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances of the related art, and an object of the present invention is to provide a magnetic head support device capable of obtaining a stable head touch without abnormal disk adsorption.

[Means for solving the problem]

The above object has a magnetic head, and a magnetic head support that supports the magnetic head in a state where the magnetic head protrudes from a first concave portion defined by a first annular projection, and has a rotating flexibility. A magnetic disk supporting device for generating a negative pressure in the first concave portion to suck the magnetic disk and to make the magnetic disk face a gap of the magnetic head, wherein the magnetic head support comprises:
A second annular projection formed at an outer edge portion, and a second recess defined by the second annular projection and the first annular projection, wherein the first recess is Is formed shallower than the depth of the second recess, and the first
A first groove communicating the first concave portion and the second concave portion is provided downstream of the annular protrusion in the magnetic disk rotation direction, and a first groove is provided downstream of the second annular protrusion in the magnetic disk rotation direction. ,
A second communication between the second recess and the outside of the magnetic head support.
And the gap of the magnetic head is positioned upstream of the center of the first recess in the direction of rotation of the magnetic disk.

[Action]

According to the above means, the first groove formed in the first ridge does not cause the first recess to be in a sealed state, and the inside of the first recess is swept from the first groove by viscousness. An appropriate negative pressure is maintained by the balance between the discharged air and the air flowing backward to the first recess due to the pressure difference.

As a result, disk adsorption does not occur and a stable head touch is obtained.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, each component that is the same as or can be regarded as the same as the conventional example is denoted by the same reference numeral, and redundant description will be omitted as appropriate.

FIG. 1 is a plan view of the main body of the magnetic head supporting device according to the embodiment, and FIG. 2 is a sectional view taken along line AA 'of FIG. Also,
FIG. 3 and FIG. 4 are cross-sectional views of a main part showing a state where the magnetic head is mounted on the magnetic head support according to the present invention.

In FIG. 1, a first and second ridges 3 and 4 are formed concentrically on a magnetic head support 1, and the first and second ridges 3 and 4 are provided on the inner peripheral side downstream of the first ridge 3 in the disk rotation direction. Is provided for guiding air in the second recess 6 into the first recess 5.
Grooves 8 are formed. Also, the second ridge 4 on the outer peripheral side
A second groove 9 for guiding air outside the magnetic head support 1 is formed in the second concave portion 6 on the downstream side in the disk rotation direction (the direction of arrow R in the drawing). Further, the depth of the first concave portion 5 is formed smaller than the depth of the second concave portion 6. The depth d ₂ of the first concave portion depth of 5 d ₁ and the second recess 6, the magnetic head of the support 1 in diameter (the same as the outer diameter of the second ridges 4) is 6.4 mm, The inner diameter of the second ridge 4
6.0 mm, the outer diameter of the first ridge 3 is 4.4 mm, the inner diameter of the first ridge 3 is 4.0 mm, the width of the second groove 9 is 1 mm, and the width of the first groove 8 is 1 mm. At this time, d ₁ = 30 μm and d ₂ = 70 μm, respectively. The hole 10 shown in FIG. 1 and FIG.
Is a mounting hole for mounting the core of the magnetic head 2. All other components that are not particularly described are configured in the same manner as the conventional example.

In the magnetic head support device configured as described above, the air in the first recess 5 is swept by the viscosity of the air from the first groove 8 formed in the first ridge 3 by the rotation of the disk. At the same time, the air flows back from the second recess 6 to the first recess 5 due to the pressure difference. At this time, when the sweeping of the air due to the viscosity of the air and the backflow of the air into the first recess 5 are balanced, the inside of the first recess 5 is in a moderate negative pressure state, and the magnetic disk 1 is sucked into the recess 5. Then, the first concave portion 5
When the magnetic head 2 supported by the magnetic head 2 pushes up the magnetic disk, the gap 2a of the magnetic head 2 comes into sliding contact with the magnetic disk, thereby reading information on the magnetic disk and / or reading the information.
Or write.

Therefore, in order to always keep the inside of the first recess 5 in an optimal negative pressure state, the present invention sets the depth d ₁ of the first recess 5 to 30 μm and the depth d ₂ of the second recess 6 to 70 μm. And However, it has been confirmed that a similar negative pressure state can be obtained when d ₁ is in the range of 20 to 30 μm and d ₂ is in the range of 40 to 80 μm.

As described above, according to the present invention, the first concave portion in which the magnetic head 2 is supported always keeps a proper negative pressure state, so that the magnetic disk sucked by the excessive negative pressure can be used as the magnetic head support 1.
Abnormally strongly adsorbed can be prevented. Therefore, a stable head touch to the disk can be obtained.

Further, the negative pressure in the first recess 5 is determined not by the submicron spacing between the upper surface of the first ridge 3 and the magnetic disk as in the conventional example, but by the first recess 5. Is the distance between the bottom surface of the magnetic disk and the magnetic disk, that is, the depth d1 of the _first recess 5, so that the surface roughness of the magnetic head support 1, the amount of protrusion of the magnetic head, the undulation and rigidity of the magnetic disk, the change in dust, and the like. Less sensitive to the effects of Therefore, the dimensional change of the magnetic head support 1 or the magnetic disk,
Alternatively, a stable head touch can be obtained even when the amount of dust is changed due to environmental changes.

By the way, in the magnetic head support device of the present invention, the first and second grooves 8, 9 are formed in the first and second ridges 3, 4, respectively, on the downstream side in the disk rotation direction. Due to the flow, the magnetic head 2 comes into contact with the magnetic disk, and the portion which presses the magnetic disk most strongly is the gap 2a.
Slightly upstream of the disk rotation direction. Therefore, in order to obtain the best read and / or write characteristics, it is necessary to move the gap 2a by a predetermined amount to the upstream side in the disk rotation direction. Therefore, in the present invention, the magnetic head 2 is set at a position where the gap 2a presses the magnetic disk D most strongly by inclining the magnetic head 2 by a predetermined amount toward the upstream side in the disk rotation direction as shown in FIG. In fact, in the present invention, the position of the gap 2a is such that the displacement l ₁
However, the magnetic head 2 may be tilted so as to be displaced by l ₁ = 10 to 100 μm.

In order to obtain the same effect, the magnetic head 2 is moved in parallel to the downstream side in the disk rotation direction by a predetermined amount as shown in FIG. 4 and the gap 2a is set to the position where the magnetic disk D presses the magnetic disk D most strongly. Good. In fact merits, the displacement amount l ₂ position of Giyatsupu 2a is in disc rotation direction downstream side, l ₂ = 50 to 50
What is necessary is just to move the magnetic head 2 in parallel so as to be displaced by 0 μm.

〔The invention's effect〕

As is clear from the above description, according to the magnetic head supporting device having the above-described configuration, it is possible to prevent the magnetic disk from being attracted to the concave portion in which the magnetic head is supported, and to reduce the inside of the concave portion with a moderate load. Since the magnetic head presses the magnetic disk in the best condition while maintaining the pressure state, a stable head touch can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a magnetic head support device according to the present invention, FIG. 2 is a sectional view taken along line AA 'of FIG. 1, and FIGS. FIG. 5 is a cross-sectional view of a main part of the conventional magnetic head support device, showing a mounted state of the magnetic head. FIG. 1 ... magnetic head support, 2 ... magnetic head, 3 ... first annular projection (first ridge), 4 ... second annular projection (second ridge), 5 ... ... 1st recessed part, 6 ... 2nd recessed part, 8 ... 1st groove, 9 ... 2nd groove.

Claims (2)

(57) [Claims] 1. A magnetic head comprising: a magnetic head; and a magnetic head support for supporting the magnetic head in a state protruding from a first recess defined by a first annular projection. A magnetic disk having a negative pressure generated in the first recessed portion, sucking the magnetic disk, and causing the magnetic disk to face a gap of the magnetic head. A second annular projection formed on an outer edge portion, and a second annular projection defined by the second annular projection and the first annular projection.
A depth of the first concave portion is formed smaller than a depth of the second concave portion, and a depth of the first annular protrusion is lower than a depth of the first annular projection in a magnetic disk rotation direction. A first groove communicating the first concave portion and the second concave portion is provided, and the second concave portion and the outside of the magnetic head support are located downstream of the second annular protrusion in the magnetic disk rotation direction. A magnetic head supporting device, wherein a second groove communicating with the magnetic head is provided, and a gap of the magnetic head is located upstream of a center position of the first concave portion in a rotation direction of the magnetic disk. 2. A magnetic head supporting device according to claim 1, wherein said magnetic head is tilted by a predetermined amount toward an upstream side in a magnetic disk rotation direction and supported by a magnetic head support.