JPH079242Y2 - Magnetic head support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is used in a magnetic disk drive for recording and / or reproducing information signals on a flexible magnetic disk rotated by a magnetic head. The present invention relates to a magnetic head support device.

(Prior Art) A magnetic disk drive device that records and / or reproduces an information signal on a magnetic disk formed into a disk shape is now widely used as an external storage device of an information processing device such as a computer or a word processor. Has been done.

One of these information processing apparatuses is called a still video prop disk drive for recording and / or reproducing a still image signal. This magnetic disk drive is a small one that uses a 2 inch diameter prop disk and is installed in a still video prop camera.
By the same operation as the camera device using the photosensitive film,
Image information is recorded on a still video prop disc.

The magnetic disk drive device includes a magnetic head support that supports the magnetic head in a state of protruding in the recess, an annular protrusion that forms the recess, and a position facing the magnetic head support via the magnetic disk. It is provided with a regulating means for regulating the maximum distance of the magnetic disk from the magnetic head.

FIG. 3 (a) is a plan view of a conventional magnetic head supporting device according to the above proposal, and FIG. 3 (b) is a sectional view thereof. In the figure, the magnetic head support 1 is formed in a disk shape in plan view, and the magnetic head 2 having a gap 2A is formed in the central portion and two protrusions 3 and 4 are formed in a concentric shape.
As a result, the first recessed portion 5 and the second recessed portion 6 are formed between the first protrusion 3 and the second protrusion 4 and inside the second protrusion, respectively. In the case of this example, the first and second protrusions 3 and 4 protrude by about 50 μm from the surface of each recess 5 and 6, and the surface is formed in a flat shape. With the magnetic head support 1 thus configured, when the magnetic disk is rotated along the upper surface of the magnetic head support 1, the first recessed portion 5 and the second recessed portion 6 have a negative pressure. As a result, the magnetic disk is sucked into the upper surface of the magnetic head support 1 and deforms along the irregularities of the magnetic head support 1, and slides into the gap 2A of the magnetic head 2 at a predetermined load pressure. This allows the recording and / or reproduction of the information signal.

With the above configuration, it is possible to prevent adsorption of the magnetic disk and always obtain an appropriate load pressure.

(Problems to be solved by the invention) By the way, according to the magnetic head supporting device configured as described above, the airflow flowing from the upstream side in the magnetic disk rotating direction is the protrusion provided on the magnetic head supporting body 1.
Negative pressure is generated by 3, 4 and the recesses 5, 6. But,
As the amount of protrusion of the magnetic head 2 due to the design change is increased, the suction force due to the negative pressure increases, and the protrusions 3 and 4 generate about half of the suction force. Due to the negative pressure on the upper surfaces of the protrusions 3 and 4, the upper surfaces of the protrusions 3 and 4 and the magnetic disk 7 are brought into sliding contact with each other, and an extra load is applied to the motor that rotationally drives the magnetic disk 7, and stable load pressure is obtained. I couldn't do it.

Therefore, an object of the present invention is to provide a magnetic head supporting device that reduces the load applied to a motor and can always obtain a stable head contact.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a magnetic head,
A magnetic head support for supporting the magnetic head, a first annular protrusion is formed on an outer edge of the magnetic head support, and the first annular protrusion defines a first recess. As described above, a second annular protrusion is formed inside the first annular protrusion, and a second concave portion defined by the second annular protrusion is provided in a downstream side in the magnetic disk rotation direction. The magnetic head is attached to and supported by the magnetic head support in a state where the magnetic head is moved by a very small amount, and the first recess and the magnetic head support are provided downstream of the first annular protrusion in the magnetic disk rotation direction. Is provided with a first groove for communicating with
This is achieved by providing a second groove that connects the second recess and the first recess on the downstream side of the second annular protrusion in the magnetic disk rotation direction.

(Operation) According to the above means, the magnetic disk is attracted to the magnetic head side in the second recess by the negative pressure. Further, from the position of the magnetic head, the first protrusion is located upstream in the magnetic disk rotation direction, that is, the side without the first groove, and the first projection is located downstream in the magnetic disk rotation direction, that is, the side with the first groove. Since the distances are different, the magnetic disk is largely deflected on the upstream side in the rotating direction of the magnetic disk having a long distance, and is small in the downstream side in the rotating direction of the magnetic disk having a short distance. As a result, negative pressure can be reduced on the upper surfaces of the first and second protrusions on the upstream side in the magnetic disk rotation direction. As a result, the sliding contact between the magnetic disk and the upper surfaces of the first and second protrusions is relaxed, and the load on the motor can be reduced.

Further, by the first groove provided on the downstream side of the first protrusion in the magnetic disk rotation direction and the second groove provided on the downstream side of the second protrusion in the magnetic disk rotation direction, the outside of the magnetic head support is provided. Stable load pressure can be obtained by controlling air so that the air does not enter the first and second recesses and the negative pressure in the first and second recesses does not become too high.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 (a), (b) and FIG. In addition, the same reference numerals are given to the respective constituent members that are the same as or can be regarded as the same as those in the conventional example, and detailed description thereof will be omitted.

1 (a) and 1 (b) are a plan view and a sectional view of a magnetic head supporting device showing a first embodiment, and FIGS. 2 (a) and 2 (b) are a second embodiment. 3A and 3B are a plan view and a cross-sectional view of the magnetic head support device shown.

First, the first embodiment will be described. Figure 1 (a), (b)
In the magnetic head support 11 shown in FIG.
The diameter of 11 (same as the outer diameter of the first protrusion 3) is 6.4 mm, the first
The inner diameter of the protrusion 3 is 6.0 mm, the outer diameter of the second protrusion 4 is 4.4 mm,
The inner diameter of the second protrusion is 4.0 mm, and the first and second recesses 5,6
Depth d is set to 30 μm, and the magnetic head 2 projects 20 μm more than the projections 3 and 4. Also, the magnetic head 2
In the second concave portion 6, the magnetic head support 11 is provided on the downstream side in the magnetic disk rotation direction (direction of arrow R in the figure).
It is formed so as to move in parallel about 1.0 mm from the center of and project. Then, on the downstream side of the first protrusion 3 and the second protrusion 4 in the magnetic disk rotation direction, the first groove M for communicating the outside of the magnetic head support 1 and the second recess 5 respectively.
1, and the second groove M2 that connects the first recessed portion 5 and the second recessed portion 6 is cut.

According to the above configuration, the magnetic disk 7 is moved downward (indicated by an arrow N in the figure) in the second concave portion 6 on the upstream side in the magnetic disk rotation direction.
Direction, the magnetic disk 7 is pushed upwards (in the direction of arrow P in the figure) on the upper surface of the second protrusion 4 on the upstream side in the direction of rotation of the magnetic disk (the direction of arrow R in the figure). Therefore, the sliding contact between the magnetic disk 7 and the upper surface of the first protrusion 3 on the upstream side in the magnetic disk rotation direction is relaxed. Also,
On the downstream side in the direction of rotation of the magnetic disk, the distance between the first protrusion 3 and the magnetic head 2 is short, so the amount of deflection of the magnetic disk 7 is small, and the positive pressure is applied to the upper surfaces of the first protrusion 3 and the second protrusion 4. Negative pressure causes these protrusions 3,4 to
The sliding contact of the magnetic disk 7 with the magnetic disk does not occur.

Further, since the first and second protrusions 3 and 4 are provided with the first and second grooves M1 and M2 as kerfs, the negative pressure in the first and second concave portions 5 and 6 is high. Then, depending on the height of the negative pressure, the air outside the magnetic head support 1 enters the first and second recesses 5 and 6 through the first and second grooves M1 and M2, Automatically control the negative pressure so that it does not become too high. Therefore, in addition to the effect of the first embodiment, it is possible to always obtain a stable load pressure.

Next, a second embodiment will be described. The magnetic head support 21 shown in FIGS. 2 (a) and 2 (b) is the same as the magnetic head support 11 of the first embodiment, except that the first recess 5 and the second recess 6 communicate with each other. The third groove M3 is provided on the upstream side of the second protrusion 4 in the magnetic disk rotation direction. As a result, the air in the second concave portion 6 passes through the third groove M3 and has a strong negative pressure due to the third groove M3 provided on the upstream side of the second protrusion 4 in the magnetic disk rotation direction. Since it flows into the first recessed portion 5, the negative pressure in the first recessed portion 5 increases accordingly. As a result, the attraction force for attracting the magnetic disk 7 into the second recess 6 that supports the magnetic head 2 is equal to the second
The magnetic head support 11 is larger than that of the magnetic head support 11 of the second embodiment. However, depending on the groove shape of the first and second grooves M1 and M2 of the magnetic head support 11 of the second embodiment, the second The negative pressure of the recessed portion 6 may be too low and the magnetic disk 7 may not be sufficiently sucked. In that case, the negative pressure in the second concave portion 6 can be increased by the third groove M3.

(Effect of the Invention) According to the present invention, the magnetic head mounted and supported in the second recess is moved by a small amount to the downstream side in the magnetic disk rotation direction, and the first protrusion is moved to the downstream side in the magnetic disk rotation direction. Since the first groove is provided and the second groove is provided on the downstream side of the second protrusion in the magnetic disk rotation direction, the distance between the magnetic head and the first protrusion is long on the side without the first groove, Since the magnetic disk is short on the side where the first groove is present, the magnetic disk flexes a lot on the upstream side in the direction of rotation of the magnetic disk where the distance between the magnetic head and the first protrusion is long, that is, on the side where the first groove is absent. Since the deflection is small on the downstream side of the magnetic disk rotation direction where the distance between the head and the first projection is short, that is, on the side where the first groove is present, the negative pressure on the upper surfaces of the first and second projections is weakened, and Rotate the magnetic disk by relaxing the sliding contact with the top surface of each protrusion It is possible to reduce the load applied to the motor. Further, by the first groove provided on the downstream side of the first protrusion in the magnetic disk rotation direction and the second groove provided on the downstream side of the second protrusion in the magnetic disk rotation direction, the outside of the magnetic head support is provided. Stable load pressure can be obtained by controlling air so that the air does not enter the first and second recesses and the negative pressure in the first and second recesses does not become too high.

[Brief description of drawings]

1 (a), (b) to 2 (a), (b) illustrate an embodiment of the present invention, and FIGS. 1 (a), (b)
Is a plan view and a sectional view of a magnetic head supporting device showing the first embodiment respectively, and FIGS. 2A and 2B are a plan view and a sectional view of a magnetic head supporting device showing the second embodiment, respectively. FIGS. 3A and 3B are a plan view and a cross-sectional view showing a conventional magnetic head supporting device, respectively. 1,11,21 …… Magnetic head support, 2 …… Magnetic head, 3
...... First annular protrusion (first protrusion), 4 ... Second annular protrusion (second protrusion), 5 ... First concave portion, 6 ...
Second recess, 7 ... magnetic disk, M1 ... first groove,
M2 ... second groove, M3 ... third groove.

Claims (1)

[Scope of utility model registration request] 1. A magnetic head and a magnetic head support for supporting the magnetic head, wherein a first annular projection is formed on an outer edge portion of the magnetic head support, and the first annular projection is formed. A second annular protrusion is formed inside the first annular protrusion so that the first concave portion is defined by the second annular protrusion, and the second annular protrusion is defined by the second annular protrusion. In the department,
The magnetic head is attached to and supported by the magnetic head support in a state where the magnetic head is moved by a small amount to the downstream side in the magnetic disk rotation direction, and the first concave portion is provided on the downstream side in the magnetic disk rotation direction of the first annular protrusion. A first groove that communicates with the outside of the magnetic head support is provided, and the second concave portion and the first concave portion communicate with each other downstream of the second annular protrusion in the magnetic disk rotation direction. A magnetic head supporting device having a second groove.