JP2728751B2 - Magnetic head support device - Google Patents

Description

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.

2. Description of the Related Art A magnetic disk drive for recording / reproducing information on / from a magnetic recording medium (hereinafter, simply referred to as a disk) formed in a disk shape is an external storage of an information processing apparatus such as a computer or a word processor. It is now widely used as a device.

One of these information processing apparatuses is called a still video floppy disk drive for recording / reproducing a still image signal. This disk drive is a small type using a 2-inch diameter floppy disk, is mounted on a still video floppy camera, and records image information on the still video floppy disk by the same operation as a camera device using a photosensitive film. It has become.

One line of such a 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, comprising: a magnetic head support for supporting a magnetic head in a state of protruding inside a recess; and a magnetic head support disposed at a position opposed to the support via a disk. And a restricting means for restricting the maximum distance of the disk from the disc. However, if the disk is sucked by using the recess as described above, in a severe case, the disk may be attracted to the magnetic head support and even the rotation of the disk may not be possible. People apply for Japanese Patent Application Sho 62
No. 251543 proposes an invention in which an annular projection (hereinafter referred to as a ridge) that forms the inside of a recess is provided with a groove that connects adjacent spaces defined by the ridge to control suction force. .

This will be described specifically. FIG. 3 is a plan view of the magnetic head support according to the proposal. In FIG. 1, a magnetic head support 1 is formed in a disk shape in a plan view, and a magnetic head 2 having a gap 2a is provided at a central portion thereof, and two protrusions are provided at an outer peripheral portion and an inner peripheral portion. 3, 4 are formed in concentric circles. Thereby, the first ridge 3 and the second ridge 4
A first concave portion 5 and a second concave portion 6 are formed between the first and second ridges 4, respectively. In the case of this example, the first and second projections 3 and 4 are 30 to 40
It protrudes by about μm, and its surface is formed in a planar shape.
Then, on the downstream side in the disk rotation direction (the direction of arrow A in the figure), the space defined by the first and second ridges 3 and 4, ie, the outside of the magnetic head support 1 and the first recess 5, In addition, first and second grooves 7, 8 communicating the first recess 5 and the second recess 6 are cut.

When the magnetic head support 1 is configured in this manner, when the disk is rotated at a high speed along the upper surface of the magnetic head support 1, the first recess 5 and the second recess 6 have a 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 recessed portions 5 and 6 increases due to the suction described above, the first and second protrusions 3 and 4 formed by the first and second protrusions 3 and 4 according to the height of the negative pressure. And the magnetic head support 1 in the first and second recesses 5, 6 through the second grooves 7, 8
It automatically controls so that the air outside of the air does not enter and the negative pressure does not become too high. That is, the rotation of the magnetic disk causes the air in the second recessed portion 6 to be swept out by the viscosity of the air from the second groove 8 formed in the second ridge 4, and the pressure difference causes the air in the first recessed portion 6 to be removed. From the concave portion 5 to the second concave portion 6
The air flows backward. At this time, when the sweeping of the air due to the viscosity of the air and the backflow of the air into the second concave portion 6 are balanced, the inside of the second concave portion 6 is in a moderate negative pressure state, and the magnetic disk is moved to the second concave portion. It is sucked into the second recess 6. By providing the grooves 7 and 8 as described above, it is possible to prevent the disk from being attracted and always obtain an appropriate load pressure.

[Problems to be Solved by the Invention] However, in the above-described conventional example, although the pressure in the recessed portions 5, 6 can be controlled by the grooves 7, 8, the inside of the recessed portions 5, 6 is controlled based on the atmospheric pressure level. , Is always in a negative pressure state.

On the other hand, since the disk rotates at a constant rotation speed of, for example, 3600 rpm, the linear velocity of the disk rotation increases from the innermost peripheral portion to the outermost peripheral portion of the disk.

Therefore, as the magnetic head support 1 moves toward the outer periphery of the disk, the negative pressure in the recesses 5 and 6 increases, so that the gap of the magnetic head 2 protruding from the center of the magnetic head support 1 is formed. The head pressing force by which the surface presses the contact surface with the disk increases.

Therefore, since the head pressing force changes depending on the track position where the magnetic head 2 is positioned on the disk surface, reliable writing and / or reading of signals cannot be performed, and writing and / or reading errors may occur. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional technology, and has as its object to achieve stable writing and / or reading of signals with little change in the head pressing force of a magnetic head at all track positions on a disk surface. It is to provide a possible magnetic head support device.

Means for Solving the Problems The object is to provide a magnetic head, a magnetic head support for supporting the magnetic head, and bringing the magnetic head support close to a rotating flexible magnetic disk. In a magnetic head supporting apparatus in which a magnetic disk is opposed to a gap of a magnetic head, the magnetic head support has a first annular ridge located on an outer peripheral side thereof, and a first annular ridge located on an inner peripheral side of the ridge. A second annular ridge located therein; a first recess defined by the first and second annular ridges; and a second recess defined by the second annular ridge. The magnetic head is mounted in the second concave portion, and the first annular protrusion is provided on the downstream side in the rotation direction of the magnetic disk with the outside of the magnetic head support and the first ring. A first groove communicating with the recess is formed; And the second annular ridge is provided with a second groove extending into the first groove and communicating the outside of the magnetic head support with a second recess. Achieved by

[Operation] According to the above means, the negative pressure of the first concave portion and the negative pressure of the second concave portion are mutually affected by the second groove formed in the second annular ridge. In addition, the pressure can be adjusted independently, and the negative pressure due to the second recess in which the magnetic head is supported can be made smaller than the negative pressure in the first recess. As a result, regardless of the difference in linear velocity between the outer circumference and the inner circumference of the track of the magnetic disk, there is a degree of freedom in the design of the magnetic head support, and the change in the head pressing force by which the magnetic head presses the magnetic disk is reduced. It is possible to

Example An example of the present invention will be described below 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 above-described conventional example is denoted by the same reference numeral, and redundant description will be omitted as appropriate.

Plan view of a magnetic head supporting apparatus main body Figure 1 is according to the embodiment, FIG. 2 AOA of Figure 1 ^- is a line cross-sectional view. In FIG. 1, a magnetic head support 1 has first and second ridges.
3, 4 are formed concentrically, and on the downstream side of the first ridge 3 on the outer peripheral side in the disk rotation direction (the direction of arrow A in the drawing),
A first groove 9 for guiding air outside the magnetic head support 1 is formed in the first recess 5. Further, a second groove 10 for directly guiding air outside the magnetic head support 1 into the second recess 6 is provided on the downstream side in the disk rotation direction of the second protrusion 4 on the inner peripheral side. In the first groove 9, the second ridge 4
Is formed by extending the open end to the outer periphery of the magnetic head support 1 with the downstream end in the disk rotation direction as the open end. The second groove 10 is provided in the magnetic head support 1.
(The same as the outer diameter of the first ridge 3) is 6.8 mm, the inner diameter of the first ridge 3 is 6.1 mm, the outer diameter of the second ridge 4 is 4.3 mm, and the second ridge 4 Has an inner diameter of 4 mm, an amount of depression of the first recess 5 from the upper surface of the first and second ridges 3 and 4 is 40 μm, and an upper surface of the second recess 6 from the upper surface of the second ridge 4. Depression amount is 200μm
At this time, the groove width ω is set to 0.6 mm and the groove depth h is set to 200 μm. The hole 11 shown in FIG. 1 and FIG.
Is a mounting hole for mounting the core of the magnetic head 2. In addition, all the other parts not particularly described are configured in the same manner as in the above-described conventional example.

In the magnetic head supporting device configured as described above, the inside of the second recessed portion 6 where the magnetic head 2 is supported and the outside of the magnetic head support 1 are communicated by the second groove 10,
In addition, since the depth of the groove 10 is sufficiently deep, the inside of the second recess 6 can be set to a value closer to the atmospheric pressure than the negative pressure of the first recess 5, and the magnetic head 2 on the disk surface can be set. Even if the linear velocity of the disc changes due to the change of the track position where
The influence on the head pressing force of the magnetic head 2 pressing the disk surface can be reduced, and a stable contact state between the magnetic head 2 and the disk can be obtained. Further, since the second groove 10 has an open portion on the downstream side in the magnetic disk rotation direction, dust and the like in the concave portion 6 are swept out of the magnetic head support 1 by rotation of the disk. Therefore, at the time of contact between the magnetic head 2 and the disk, writing and / or reading errors due to the influence of dust can be suppressed.

[Effects of the Invention] As is clear from the above description, the second concave portion defined by the ridge and the outside of the magnetic head support are provided downstream of the second annular ridge in the rotation direction of the magnetic disk. According to the present invention in which the second groove communicating with the first recess is formed, the second recess in which the magnetic head is supported can adjust its negative pressure independently of the first recess, and By designing the negative pressure in the recessed portion to a small value, a change in the head pressing force due to the track position on the disk surface is reduced, and the signal can be written and / or read reliably.

[Brief description of the drawings]

FIGS. 1 and 2 is intended meta explaining an embodiment of the present invention, a plan view of a magnetic head support according to Figure 1 embodiment, FIG. 2 AOA of FIG. 1 ^- line cross section, the FIG. 3 is a plan view of a magnetic head support according to a conventional example. DESCRIPTION OF SYMBOLS 1 ... Magnetic head support, 2 ... Magnetic head, 3 ... 1st protrusion, 4 ... 2nd protrusion, 5 ... 1st recessed part, 6 ... 2nd recessed part, 9 ... first groove, 10 ... second groove

Claims (2)

(57) [Claims] A magnetic head, comprising: a magnetic head; and a magnetic head support for supporting the magnetic head. The magnetic head support is brought close to a rotating flexible magnetic disk. In a magnetic head support device for facing a magnetic disk, the magnetic head support includes:
A first annular ridge located on the outer peripheral side, a second annular ridge located on the inner peripheral side of the ridge, and the first and second annular ridges are defined. A first recess and the second recess
A second recess defined by an annular ridge is provided, and the magnetic head is mounted in the second recess,
On the downstream side in the rotation direction of the magnetic disk, the first annular ridge is connected to the outside of the magnetic head support and the first annular projection.
A first groove communicating with the recess is formed, and the second annular ridge extends into the first groove so as to extend from the outside of the magnetic head support to the second recess. A magnetic head supporting device, wherein a second groove communicating with a portion is provided. 2. The magnetic head supporting device according to claim 1, wherein the depth of the second recess is greater than the depth of the first recess.