JPH0146940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to keep fluctuations in the flying height of a swing arm type floating head slider for recording and reproducing information on a rotating recording/reproducing disk to a small level.

FIG. 1 is a diagram showing an access method for a floating head slider in a conventional swing arm system. The swing arm 6, which has the floating head slider 1 attached to its tip, moves from B to C around the arm bearing 7.
, and is set at a predetermined position, and information is written to or read from the recording/reproducing disk 4.

2 is an explanatory diagram of the operation of the floating head slider 1 of FIG. 1, and FIG. 3 is a perspective view of the floating head slider 1 of FIGS. 1 and 2 turned over. In the figure, 2 is a floating surface, 3 is an air inflow slope surface whose distance from the magnetic disk 4 surface gradually narrows from the air inflow side to the air outflow side, and the floating surface 2 and the air inflow slope surface 3 This constitutes a positive pressure generating section 8 having a length l. Further, the positive pressure generating section 8 is divided into two surfaces 8a and 8b, each having a width W. In this example, the floating surface 2 is configured so that when the magnetic disk 4 is stopped, the floating surface 2 is parallel to the 4th surface of the magnetic disk, and when the magnetic disk 4 is rotating, the distance between the floating surface 2 and the 4th surface of the magnetic disk becomes gradually narrower from the air inflow side to the air outflow side. has been done. Reference numeral 5 denotes a pressing spring for pressing the floating head slider 1 against the magnetic disk 44 with a predetermined pressure. F is the direction of the levitation force, U is the magnetic disk 4
indicates the direction of rotation. In FIG. 2, while the magnetic disk 4 is at rest, the floating head slider 1 is in contact with the surface of the magnetic disk 4 due to the pressing force of the pressing spring 5, but the magnetic disk 4 rotates at high speed in the direction shown by arrow U. Once started, an air flow is generated and this air flow flows in from the air inflow slope 3. Then, pressure is generated on the floating surface 2 and a floating force F is generated, and the floating head slider 1 floats up and is stably held in the air at a point balanced with the pressing force of the pressing spring 5.

FIG. 4 is a diagram showing a change in the direction of the air flow flowing through the floating head slider 1 due to the movement of the swing arm 6. The direction of the flow of air near the surface of the magnetic disk 4 caused by the frictional force when the magnetic disk 4 rotates is tangential to the circumference of the magnetic disk 4. Therefore, assuming that the longitudinal direction of the positive pressure generating parts 8a, 8b of the floating head slider 1 and the tangential direction of the circumference of the magnetic disk 4 coincide at point A in FIG. 1, the air flow direction at this time is The direction is from A to A in FIG. 4, and corresponds to the longitudinal direction of the positive pressure generating portions 8a and 8b of the floating head slider 1.
Next, when moving the swing arm 6 to record or reproduce information at position B in FIG. 8a, 8
The direction b is shifted, and air flows from an oblique direction of the floating head slider 1, as shown from B to B in FIG. The same applies to point C in FIG. The angle between the direction of this air flow and the longitudinal direction of the floating head slider 1 is called the yaw angle.

FIG. 5 is a diagram showing the pressure distribution in the width W direction generated on the floating surface 2a of the floating head slider, and FIG.
→In the case of the A direction, the generated pressure is distributed symmetrically to the bisector of the width W of the floating surface 2a, but when air flows in diagonally as in the B→B direction, the generated pressure is distributed symmetrically to the bisector of the width W of the floating surface 2a. The pressure distribution also becomes asymmetrical. The same applies to the C→C direction. In this way, in the case of an asymmetric pressure distribution, not only does the floating head slider 1 tilt with respect to the width direction, but also the flying height becomes low because the flying force F becomes small. For this reason, recording information,
Severely affects playback.

As mentioned above, the conventional floating head slider 1
This has drawbacks such as large fluctuations in the flying height due to changes in the air inflow direction when the swing arm 6 moves, and furthermore, fluctuations in the flying height due to changes in travel speed due to the movement of the swing arm 6. Was.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and includes a positive pressure generating part having at least a part where the distance from the disk surface gradually narrows from the air inflow side to the air outflow side. , negative pressure generating portions are provided in at least two locations in the front and back from the air inflow side to the air outflow side, and negative pressure generating portions are provided in the positive pressure generating portion, the distance from the disk surface gradually increasing from the air inflow side to the air outflow side. It is an object of the present invention to provide a floating head slider that can maintain a small fluctuation in flying height even if the air inflow direction and traveling speed change when the swing arm moves.

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 6, the magnitude of the fluctuation in the flying height with respect to the change in the air inflow direction, that is, the change in the yaw angle, depends on the aspect ratio W/l of the positive pressure generating section 8. The smaller /l is, that is, the more elongated the positive pressure generating section 8 is, the more significant the variation in flying height due to the yaw angle becomes. In other words, it can be seen that in order to reduce fluctuations in the flying height, the aspect ratio W/l of the positive pressure generating section 8 can be increased. However, if the length l of the positive pressure generating section 8 is simply shortened and the width W is increased, it becomes unstable in the front-rear direction with respect to air inflow.

FIG. 7 is an inverted perspective view of a floating head slider according to an embodiment of the present invention. In the figure, 2c and 2d are floating surfaces, and 3c and 3d are sloped surfaces for air inflow whose distance from the disk surface 4 gradually narrows from the air inflow side to the air outflow side. Positive pressure generating portions 8c and 8d having lengths l ₁ and l ₂ and width W due to inflow slope surfaces 3c and 3d
It consists of In addition, in this embodiment, the floating surface 2
When the magnetic disk 4 stops, the magnetic disk 4
It is parallel to the surface of the magnetic disk, and during rotation, the distance from the four surfaces of the magnetic disk gradually narrows from the air inflow side to the air outflow side. Reference numeral 9 denotes a negative pressure generating section having a length _l3 width W, in which the distance from the disk surface 4 gradually increases from the air inflow side to the air outflow side, and is provided between the positive pressure generating sections 8c and 8d. There is.

Floating head slider 1 configured as above
The pressure distribution in the direction of the central length l is as shown by the solid line in Figure 8, with positive pressure sections at the front and rear sections indicated by lengths l ₁ and l ₂ , and negative pressure sections at the middle indicated by length l ₃ . Becomes a department. In both the front and rear portions, the substantial positive pressure generating portions 8c, 8d have aspect ratios W/l, W/ _l2 considerably larger than the aspect ratio W/l of the conventional one. Therefore, fluctuations in flying height when the yaw angle changes are kept smaller than in the conventional case. In addition, in FIG. 8, the broken line shows the pressure distribution in the length l direction of the conventional one.

Furthermore, due to the effect of the negative pressure generating section 9, the traveling speed of the magnetic disk 4 increases and a negative pressure suction force is applied to the floating head slider 1, so that fluctuations in flying height due to changes in traveling speed are reduced compared to the conventional one. Can be made smaller. FIG. 9 is a characteristic diagram showing the relationship between the flying height of the floating head slider 1 and the running speed of the magnetic disk 4, where the solid line represents the floating head slider according to the embodiment of the present invention shown in FIG. 7, and the broken line represents the conventional floating head slider. represent something. As is clear from this figure, the variation in flying height due to changes in traveling speed is smaller in one implementation of the present invention than in the conventional one.

FIG. 10 is an inverted perspective view of a floating head slider according to another embodiment of the present invention, in which the floating head slider according to one embodiment of the present invention shown in FIG. The central part is cut out in the length l direction. In the figure, 9a and 9b are positive pressure generating parts 8a and 8, respectively.
This is a negative pressure generating section provided between b, 8c and 8d. Even in this case, each positive pressure generating section 8a
The aspect ratio of ~8d is larger than the conventional one, and
Because of the negative pressure generating parts 9a and 9b, fluctuations in the flying height can be kept smaller than in the conventional case even if the air inflow direction and traveling speed change.

In addition, in both the above embodiments, the positive pressure generating portions 8, 8
Although a to 8d are shown in the example in which they are provided in two places, front and back, from the air inflow side to the air outflow side, they may be provided in three or more places as shown in Fig. 10.
The number of negative pressure generating sections 9 provided between the positive pressure generating sections 8 also naturally increases.

Further, the air inflow slope surface 3 may be formed of a curved surface, and furthermore, the entire positive pressure generating section 8 consisting of the air inflow slope surface 3 and the floating surface 2 may be formed of a curved surface. In this case, there is no need to distinguish between the air inflow slope surface 3 and the floating surface 2.

Further, the negative pressure generating section 9 may be configured with a curved surface.

As described above, according to the present invention, the positive pressure generating section has at least a portion where the distance from the disk surface gradually narrows from the air inflow side to the air outflow side. A negative pressure generating section is provided between the positive pressure generating sections, which is provided at at least two locations in the front and rear, and the distance from the disk surface gradually widens from the air inflow side to the air outflow side, so that the swing arm can be moved. Even if the air inflow direction and running speed change, the fluctuation in the flying height can be kept small, and as a result, information can be stably recorded and reproduced on the recording/reproducing disk.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the access method of the conventional floating head slider, Fig. 2 is an explanatory diagram of the operation of the floating head slider shown in Fig. 1, and Fig. 3 shows the conventional floating head slider shown in Fig. 1. FIG. 4 is a plan view showing changes in the airflow flowing through the floating head slider due to movement of the swing arm; FIG. 5 is an explanatory diagram showing the pressure distribution in the width direction of the floating surface of the floating head slider; FIG. 6 is a characteristic diagram showing the influence of the aspect ratio of the positive pressure generating section on the yaw angle flying characteristics of a conventional floating head slider, and FIG. 7 is a perspective view showing the floating head slider according to an embodiment of the present invention turned over. , Fig. 8 is an explanatory diagram showing the airflow pressure distribution in the length direction at the center of the floating head slider, Fig. 9 is a characteristic diagram showing the relationship between flying height and traveling speed, and Figs. 10 and 11 are respectively FIG. 7 is an inverted perspective view of a floating head slider according to another embodiment of the invention; In the figure, 1 is a floating head slider, 4 is a recording/reproducing disk, 6 is a swing arm, 8, 8
A to 8d are positive pressure generating parts, and 9, 9a to 9b are negative pressure generating parts. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a swing arm type floating head slider for recording and reproducing information on a rotating recording/reproducing disk, the slider has at least a portion where the distance from the disk surface gradually narrows from the air inlet side to the air outlet side. The pressure generating part is arranged at least two times in the front and back from the air inflow side to the air outflow side.
A floating head slider characterized in that a negative pressure generating section is provided between the positive pressure generating sections and the distance from the disk surface gradually widens from the air inflow side to the air outflow side.