JPH042464Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement in a support spring for a magnetic head in a fixed magnetic disk device.

(Prior Art) Generally, when a magnetic disk device rotates a magnetic disk at high speed to write or read necessary information, air is caused to flow over the disk surface so that a magnetic head consisting of a core and a head slider moves over the disk surface. It is designed to levitate by a few microns against the surface.

At this time, the air flow acts on the head slider to levitate the magnetic head, and the spacing between the magnetic head and the disk surface is kept as constant as possible by the pressing force of the support spring against the disk surface.

The reason why the support spring is provided here is that if the magnetic head rises above a certain level from the disk surface, the magnetic force of the magnetic head on the magnetic disk will weaken, so the magnetic head will respond to the buoyant force caused by the airflow. In order to maintain a constant distance from the disk surface, a method is used in which the magnetic head is pressed against the magnetic disk surface using a support spring.

This conventional support spring, as shown in Figure 6,
In order to increase the rigidity, a wall portion 41 is provided by bending both sides of the flat portion 40 of the support spring (see Japanese Patent Laid-Open No. 55-22296 for a similar type). Moreover, the width of the wall 41 is made small on the free end side that holds the magnetic head in order to maintain the flexibility of the spring, and gradually increases in width toward the base end of the spring in order to increase the rigidity. is increasing.

(Problem to be solved by the invention) However, since the above-mentioned support spring has a substantially U-shape with upright walls on both edges, the airflow that levitates the magnetic head hits the walls and becomes turbulent. This creates a current and makes the flying height of the magnetic head unstable. Therefore, even though the flying height of the magnetic head is set to several microns relative to the magnetic disk, unnecessary vibrations are transmitted to the magnetic head by the action of the support spring, and in some cases, the problem of the magnetic head hitting the disk surface can be solved. arise.

Furthermore, in order to prevent the magnetic head from floating due to air currents, the support springs are provided with rigidity and a spring force directed toward the magnetic disk, and are given a pressing force against the disk surface. The pressing force increases, causing the magnetic head to stick to the lubricant-coated surface of the disk, making it difficult for the magnetic head to separate from the magnetic disk when the magnetic disk starts rotating.

In addition, the wall section provided to increase rigidity becomes a barrier to the airflow flowing in the direction around the magnetic disk, causing the support spring to vibrate from side to side and generating turbulence and eddy flow above the support spring. There also arises a problem that the flying height of the support spring due to the airflow is not stable.

Therefore, in the present invention, by generating a pressing force against the magnetic disk when the magnetic disk rotates, it is possible to stabilize the floating of the magnetic head when the magnetic disk is rotating, and to reduce the spring force in the direction of the magnetic disk. The purpose is to provide a support spring that can be used in various ways.

(Means for Solving the Problems) In order to achieve the above object, the structure of the present invention is such that a support spring that holds the magnetic head at a predetermined position with respect to the magnetic disk surface has a magnetic disk surface on both sides in the width direction. It is characterized by having wings that jut out at an acute angle in the opposite direction.

(Function) With this configuration, the airflow generated in the circumferential direction of the magnetic disk due to the rotation of the magnetic disk is guided by the blades and flows smoothly in the width direction above the support spring. At the same time, it flows in the closed space below the support spring along the width direction. Furthermore, the flow on both sides of the support spring causes the Bernoulli effect of the support spring, and a pressing force is generated in the support spring toward the magnetic disk surface.

Therefore, when the magnetic disk rotates, the magnetic head can be floated in a stable state by the spring force of the support spring having a predetermined rigidity and the pressing force obtained by the air flow. As a result, even if the spring force of the support spring in the direction of the magnetic disk is set small, the magnetic head can be reliably positioned in the vertical direction with respect to the magnetic disk when the magnetic disk is rotated.
The spring force in the direction of the magnetic disk can be reduced, the magnetic head is less likely to stick to the surface of the magnetic disk due to the action of the lubricant, and the magnetic head can be easily separated from the magnetic disk when the magnetic disk starts rotating.

(Example) Next, an example will be described based on the drawings. The support spring of the present invention is used in a fixed magnetic disk device as shown in FIG. This device has casing 1
0, one or more magnetic disks 1 as recording media, and each magnetic disk 1
It is generally composed of a magnetic head 2 for writing and reading, which is arranged corresponding to the magnetic head 2, and a support spring 3 that holds the magnetic head 2.

The magnetic disk 1 is rotated at high speed by a motor 4 attached to the lower wall of the casing 10, and a housing hub 5 attached to the output shaft of the motor 4 rotates the magnetic disk 1 at high speed.
They are designed to be installed at intervals in the axial direction. The magnetic head 2 consists of a head slider supported by a support spring and a ferrite core for writing and reading. The magnetic heads 2 are attached to the free ends 31 of a support spring 3 so as to face each other with the magnetic disk surface 1a in between, and are pressed against the magnetic disk surface 1a by the load of the support spring 3.

Each support spring 3 has its proximal end 32 connected to the casing 1
The support springs are attached to a carriage 6 that is freely slidable upright on the side of the disk 1 at a distance from each other via spacer blocks 7, and the spacing between the supporting springs corresponds to the spacing between the disks 1. It has become something to do. A drive section 8 is provided at the base of the carriage 6, and the drive section 8 is operated by appropriate means to slide the magnetic head 2 in the radial direction of the magnetic disk 1 when the magnetic disk 1 rotates. .

For this reason, the support spring 3 is an improved version of a so-called triangular gimbal (IBM3370 type, Watrous type), as shown in Figs. The shaped support spring 3 has wing parts 33, 33 extending from its base end 32 in its longitudinal direction slightly downward from the horizontal plane and protruding at an angle along two edges of the support spring 3. It is composed of a triangular central plane part 34.

The free end 31 of this support spring 3 is attached to the magnetic head 2.
The wing portions 33 extend from the point where the small protrusion 35 and the tip of the plane portion 34 meet to the proximal end 32. An angle α is formed gradually upward from the flat part 34 on the two edges of the support spring 3 up to this side.
(See Figure 3). The angle α shall be 15° or less and greater than 0°.

The wing portion 33 functions to prevent the support spring 3 from floating due to the airflow flowing between the magnetic disk surface 1a and the support spring 3 along the circumferential direction of the magnetic disk 1.

Therefore, the shape of the wing section 33 is such that the wing section 33 has a bending point 36 at the boundary between the wing section 33 and the flat section 34, so that each wing section 33 forms an oblique plane 33a. Alternatively, the wing portion 33 may have a gently curved surface 33b as shown in FIG.

Next, the operation of the embodiment of the present invention will be explained.
In the fixed magnetic disk device, during operation, the magnetic disk 1 is rotated at high speed by the motor 4, and as a result, an air flow is generated on the surface of the magnetic disk 1 along the circumferential direction of the disk. At this time, in the support spring 3 having the conventional wall portion 41, the sixth
As shown in the figure, airflow turbulence occurs on the upper surface, irregular negative pressure occurs in this area, and the spring force of the support spring 3 becomes unstable, making the flying height inconsistent.

On the other hand, in the support spring 3 of the present invention shown in FIG. 5, wing parts 33b, 33b are provided on both sides of the central plane part 34 and project out in a direction that gradually separates from the magnetic disk surface 1a. The resistance received from the flow does not become unnecessarily large. As a result, on the upper surface of the support spring 3, the air flow with the flow velocity V ₁ flows almost parallel to the upper surface, whereas on the lower surface, the air flow with the flow velocity V ₂ flows along the wing portion 33b and the flat portion 34 of the support spring 3. A velocity difference is created between the air flow velocities V ₁ and V ₂ . This velocity difference has a relationship of V ₂ >V ₁ , and the flow velocity is high on the lower surface of the support spring 3 and slow on the upper surface. According to Bernoulli's law, static pressure is low where the flow is fast and static pressure is high where the flow is slow. Therefore, the static pressure on the upper surface of the support spring 3 is high, resulting in a positive pressure, and the static pressure on the lower surface is low, resulting in a negative pressure. These positive and negative pressures act on the support spring 3, and a lifting force is applied to the support spring 3 due to the resultant force of the downward force and the upward force. That is, support spring 3
A vertical force F acts in the direction of pressing the disk against the disk surface 1a.

This vertical force F acts like a stabilizer when the magnetic head 2 floats, so it works to keep the flying height of the magnetic head constant at a minimum interval, as well as preventing turbulence in the air flow. .

As a result, the floating magnetic head 2 does not float above the magnetic disk surface 1a by more than a predetermined distance, and a minute distance is maintained, so that a high recording density on the magnetic disk 1 can be maintained.

Furthermore, when the rotation of the magnetic disk 1 is stopped, the pressing force against the magnetic disk surface 1a can be reduced.

Although the embodiments have been described above, the present invention is not limited thereto and includes the following.

Even if the support spring is not of the triangular gimbal type but is of a type that holds other floating magnetic disks, it is possible to provide wings instead of walls or protrusions to increase rigidity. .

(Effects) As is clear from the above, the present invention has the following effects:
When the magnetic disk is rotated and the magnetic head is levitated by the airflow, a force in the direction of suppressing the levitation is generated in the support spring provided with the wing section, which suppresses the flying height of the magnetic head and also increases the levitation of the magnetic head. It can also suppress vibrations. As a result, there is no need to increase the spring force of the support spring beyond a predetermined level.

Therefore, when the magnetic disk stops rotating,
Since it is possible to reduce the load applied to the magnetic head, it is no longer necessary to press the magnetic head against the magnetic disk surface for more than a certain amount as in the past, which prevents the magnetic disk from sticking due to the effect of lubricant on the disk surface. You can prevent the harmful effects that may occur.

In addition, the support spring of the present invention has a shape that receives as little resistance as possible against the airflow that causes the magnetic head to float, so that turbulence in the airflow does not occur, and moreover, it prevents the magnetic head from floating when the disk rotates. Since the magnetic head is pressed down, a stable flying height can be maintained with a minimum distance between the magnetic head and the disk surface. Therefore, a high recording density on the magnetic disk can be maintained.

Furthermore, the support spring of the conventional winchiesta type (IBM 3340 type) with a flat plate structure easily bends due to airflow, but in this invention, the wing parts provided on the two edges of the support spring also serve as rigid spring bodies. I can do it. Further, unlike in the prior art, it is not necessary to provide the support spring with excessive rigidity, so the spring properties of the support spring itself are improved, and the magnetic head can sufficiently follow the surface runout of the magnetic disk. Furthermore, in order to increase the rigidity of the support spring, the widthwise length of the flat and wall portions of the support spring is gradually increased toward the proximal end, but this can be reduced as much as possible, reducing material costs. It is also advantageous in terms of production.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a support spring in an embodiment of the present invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is an enlarged sectional view taken along line A-A in Fig. 1, and Fig. 4 is FIG. 5 is a cross-sectional configuration diagram schematically showing a fixed magnetic disk device; FIG.
The figure is a cross-sectional view of the conventional example as seen in the same manner as FIG. 5. 1...Magnetic disk, 2...Magnetic head, 3...
...Support spring, 33... Wing part, 33a... Oblique plane,
33b...Curved surface.

Claims (1)

[Scope of utility model registration request] A support for a magnetic head, characterized in that a support spring that holds the magnetic head at a predetermined position with respect to a magnetic disk surface is provided with wing portions extending at an acute angle in a direction opposite to the magnetic disk surface on both sides in the width direction. Spring.