JPH03278381A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent a magnetic head coming into contact with a magnetic disk when a device is not operated by providing a magnetic head holding mechanism which holds the magnetic head at a position separated from a magnetic disk plane when the device is not operated, and releases the holding of the magnetic head by receiving an air current generated according to the rotation of the magnetic disk when the device is operated. CONSTITUTION:The magnetic head holding mechanism 31 is provided which holds the magnetic head 5 at the position separated from the recording plane of the magnetic disk 1 at least when the device in which no magnetic disk 1 is rotated is not operated, while, releases the holding of the magnetic head 5 by receiving the air current generated according to the rotation of the magnetic disk 1 when the device in which the magnetic disk 1 is rotated at prescribed speed is operated. Therefore, it is possible to prevent the magnetic head 5 coming into contact and colliding with the magnetic disk 1 even when they are vibrated. In such a way, the damage of them can be prevented occurring, and also, such trouble that the magnetic head 5 is attracted on the magnetic disk 1 due to the influence of humidity, etc., can be evaded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a magnetic disk device in which a magnetic head records and reproduces data while floating a small amount due to the rotation of a magnetic disk.

(Prior Art) A so-called C3S system in which a magnetic head contacts the recording surface of a magnetic disk when the magnetic disk is not rotating and is not in operation, but when it is in operation it floats a small amount above the recording surface to record and reproduce data. A (contact start/stop) type magnetic disk drive is shown in FIG. 8 as a plan view, and FIG. 9 as the side view of FIG. 8. The magnetic disk 1 is fixed to a spindle 3, and is rotated at a predetermined rotational speed during recording and reproduction by a spindle motor (not shown). The magnetic heads 5.5 are arranged on both the upper and lower surfaces of the magnetic disk 1, and are attached to the swing arm 7 with screws 9. The swing arm 7 can swing around a pivot shaft 11, and the pivot shaft 11 is a pair of upper and lower yokes 1 that are constituent members of a voice coil motor that rotates the swing arm 7.
3, and the yoke 13 is fixed to the base 15.

The swinging movement of the swing arm 7 is performed by the electromagnetic force between the coil 17 attached to the swing arm 7 and the permanent magnet 19 on the yoke 13 side, and the swinging movement is caused by the electromagnetic force between the coil 17 attached to the swing arm 7 and the permanent magnet 19 on the yoke 13 side.
23 restricts its swing range.

The magnetic head 5 includes a head slider 25 that records and reproduces data on the magnetic disk 1 using a magnetic gap (not shown), a gimbal spring 27 that supports the head slider 25 in a correct posture, and a bed slider 25 that supports the magnetic disk 1. Load spring 29 that applies a load toward the recording surface
It is composed of

The henode slider 25 remains in contact with the recording surface of the magnetic disk 1 while the magnetic disk 1 is in a stationary state and rotates at a constant low speed.
A floating blade acts on the head slider 25 due to the dynamic pressure caused by air flowing between the head slider 25 and the magnetic disk 1 as it travels, and when a predetermined rotational speed is reached, the head/throat slider 25 floats a small amount. It becomes possible to record and reproduce data.

(Problems to be Solved by the Invention) As mentioned above, in the C8S type magnetic disk device, the magnetic head 5 remains in contact with the magnetic disk 1 when not in operation, so strong vibrations and shocks are applied to the device. Then,
The magnetic head 5 may knock and scratch the recording surface of the magnetic disk 1, or the slider 25 may be damaged, making it impossible to record or reproduce data.

Furthermore, since the magnetic disk 1, which has extremely high planar accuracy, and the henode slider 25 are in contact with each other, there is a problem in that an attraction phenomenon occurs between the two due to the influence of humidity, etc., and the magnetic disk 1 becomes unable to rotate.

Furthermore, in this C8S method, the magnetic disk 1 rotates with the henode slider 25 in contact with the magnetic disk 1 until the predetermined rotational speed is reached, so the lubricant applied to the recording surface is worn out and the device The number of times it can be started and stopped is limited.

Therefore, an object of the present invention is to prevent the magnetic head and the magnetic disk from coming into contact with each other, at least when the device is not operating when the magnetic disk is not rotating.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a magnetic disk device that performs recording and reproduction while floating a small amount relative to a magnetic disk by rotation of a magnetic l\rad magnetic disk. When the device is not operating and the rotation of the magnetic disk is stopped, the magnetic head is held in a position away from the magnetic disk surface, and when the device with the magnetic disk rotating is in operation, the airflow generated by the rotation of the magnetic disk is The structure is such that a magnetic holding mechanism is provided for receiving the magnetic head and releasing the holding of the magnetic head.

(Function) The magnetic head is held at a position away from the magnetic disk surface by the magnetic head holding mechanism, at least when the device is not in operation, when the magnetic disk is not rotating. Even when the magnetic head and magnetic disk vibrate, they do not come into contact with each other or collide with each other. When the device is in operation, the magnetic head holding mechanism releases its hold on the magnetic head in response to the airflow generated as the magnetic disk rotates, and the magnetic head floats a small amount relative to the magnetic disk, allowing recording and playback. becomes.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

Fig. 1 is a plan view of a magnetic disk drive to which the embodiment of Fig. 1 is applied; Fig. 2 is a view taken in the direction of the ■ arrow in Fig. 1;
A view in the direction of arrows, FIG. 4 is a view in the direction of the ■ arrow in FIG. These first
In the drawings to FIG. 4, the same constituent members as those of the conventional example shown in FIGS. 8 and 9 are given the same reference numerals, and the structural description thereof will be omitted. In this embodiment, in addition to the above configuration,
At least when the device is not operating, when the magnetic disk 1 is not rotating, the magnetic head 5 is held in a position away from the recording surface of the magnetic disk, while when the device is operating, when the magnetic disk 1 is rotating at a predetermined speed. A magnetic head holding mechanism 31 is provided which releases the holding of the magnetic head 5 in response to airflow generated as the magnetic disk 1 rotates.

The magnetic head holding mechanism 31 includes two load springs 29.2.
Two bottles 33, 33 are provided on mutually opposing sides of 9 and can be held by contacting the load springs 29, 29 with their tips.
an unload bar 37 that is pivotally supported to the base 15 by a shaft 35; and an air receiver that is pivotally supported to the base 15 by a shaft 39 and has a bifurcated tip so as to sandwich the magnetic disk 1 from above and below. has a vane 41 with a surface 40. Gear portions 43 and 45 that engage with each other are formed on the base sides of the unload bar 37 and the blades 41. A return spring 47 is provided between the pin 33 of the unload bar 37 and the base 15 to bias the unload bar 37 toward the tip of the load spring 29. Stopper pins 49 and 51 are provided on the base 15 for regulating the movement.

As shown in FIG. 2, the load springs 29, 29 are inclined in such a way that they approach the recording surface of the magnetic disk 1 from the base side near the swing arm 7 and from the tip side near the rad slider 25. It is formed. The unload bar 37 is operated as shown in FIG. 1 and FIG. The pin 33 is set so that the head slider 25 is spaced a predetermined distance from the recording surface of the magnetic disk 1.
The tip of the load spring 29 is held.

On the other hand, during operation of the device in which the magnetic disk 1 is rotating at a predetermined speed, the blade 41 rotates clockwise in FIG. At the position where it contacts the pin 51, the pin 33 of the unload bar 337 separates from the load spring 29, and the magnetic head 5 is no longer held.

In order to set the standby position of the magnetic head 5 during non-operation near the outer peripheral edge of the magnetic disk 1 as shown in FIG.
A retract spring 55 for biasing the swing arm 7 clockwise in FIG. 1 is provided between the swing arm 7 and a bin 53 erected on the base 15.

Next, the operation of the above embodiment will be explained.

During non-operation when the magnetic disk 1 is not rotating, the swing arm 7 is held in contact with the stopper 21 by the force of the retract spring 55. At this time, the blade 41 remains in contact with the inner stopper 49 because the surface 40 of the air receiver receives the air flow. Therefore, the bin 33 of the unload bar 37 is positioned closest to the tip side of the load spring 29 due to the action of the return spring 47, and pushes the rotary spring 29 outward in a direction away from the recording surface of the magnetic disk 1. . As a result, the head slider 25 is separated from the recording surface of the magnetic disk 1 as shown in FIG. 2, and the magnetic head holding mechanism 31 is in a state in which the magnetic head 5 is held.

When the spindle motor is powered on and the magnetic disk 1 begins to rotate in the direction of arrow A in FIG. 1, an air flow in the same direction is generated within the apparatus. This air flow is
The air receiver of the vane 41 hits the surface 40, causing the vane 41 to rotate clockwise in FIG. The blade 41 rotates until it comes into contact with the stopper pin 51 as shown in FIG. 5, or the unload bar 37 rotates counterclockwise in FIG. 1 accordingly.

At this time, the pin 33 comes into sliding contact with the load spring 29, and then separates from the load spring 29 when the magnetic disk 1 reaches a predetermined number of rotations and stops at the position shown in FIGS. 5 and 6.

When the bottle 33 separates from the load spring 29, the holding of the magnetic head 5 by the magnetic head holding mechanism 31 is released, and the slider 25 of the magnetic head 5 moves the magnetic disk 1 under a predetermined load by the load spring 29. However, since the magnetic disk 1 has reached a predetermined rotation speed, it floats above the magnetic disk 1 with a small gap.

When the rotational speed of the magnetic disk 1 increases and reaches a predetermined speed at which recording and reproduction are possible, a current is applied to the coil 17 by a command from a control circuit (not shown), and the swing arm 7 is caused by the electromagnetic force acting between it and the permanent magnet 19. is moved to a predetermined data track position on the recording surface of the magnetic disk 1, and data is recorded and reproduced.

When the power is turned off and the energization to the spindle motor is stopped, the retraction spring 55 pulls the swing arm 7 and returns the magnetic head 5 to the state shown in FIG. Along with this, the rotational speed of the magnetic disk 1 gradually decreases, and when the force of the air flow that the surface 40 receives becomes weaker and becomes less than the force of the return spring 47, the air receiver of the blade 41 is moved by the return spring 47 to the unload bar. 37 rotates clockwise in FIG. 1, and the bottle 33 contacts the load spring 29 while pushing the load springs 29 and 29 apart in the direction away from the magnetic disk 1. , Figures 1 and 2
The state returns to the state where the magnetic head 5 is held by the magnetic head holding mechanism 31 shown in the figure.

In this way, when the device is in a non-operating state where the rotation of the magnetic disk 1 is stopped, the magnetic head 5 is held at a position away from the magnetic disk 1 by the magnetic head holding mechanism 31, so that the magnetic head Even if the head slider 25 and magnetic disk 1 vibrate due to vibrations or shocks applied to the device, these two will not contact or collide with each other, and the recording surface of the magnetic disk 1 will be scratched or the head slider 25 may be damaged. The problem of not damaging it is Uj I
l- be done. Furthermore, during the non-operation period, the problem of the head slider 255 being attracted to the magnetic disk due to the influence of humidity is eliminated. Since the magnetic head 5 is held by the head holding mechanism 31 until it reaches a rotational speed at which it flies relative to the head slider 25 or the magnetic disk, the lubricant applied to the recording surface of the magnetic disk 1 is not worn out. The amount of carbon dioxide is extremely reduced, and a long service life is achieved.

FIG. 7 is a plan view of the second embodiment of the invention, which corresponds to FIG. 1 and is in a non-operating state. In this second embodiment, the present invention is applied to a magnetic disk device in which the rotational direction of the magnetic disk 1 is in the direction indicated by arrow B, which is opposite to that in the first embodiment.

In this case, the magnetic head holding mechanism 61 has an air receiver on the surface 40.
and 2 holding the magnetic spatula i.5.
The book bin 33 is integrated with the book bin 33 and is pivotally supported on the base 15 by a shaft 39. When the device is not in operation, when the magnetic disk 1 is not rotating, the blades 41 and the pin 33 are in the most clockwise position due to the force of the return spring 47, and the pin 33 pushes the load spring 29 apart to magnetically move the head slider 25. The magnetic head holding mechanism 61 holds the magnetic head 5 by separating it from the recording surface of the disk 1 . As the air receiving surface 40 receives the air flow generated as the magnetic disk 1 rotates, the bottle 33 rotates counterclockwise together with the blade 41 and separates from the load spring 29, and the magnetic head 5 is transferred to the magnetic head by the magnetic head holding mechanism 61. The hold will be released.

In this second embodiment, the structure other than the above is the same as the first embodiment shown in FIG. It will be done.

Note that if the rotational direction of the magnetic disk is the same as in the second embodiment, a blade that receives airflow may be provided at the position of the bottle that holds the magnetic head, so that the function of the blade and the bottle can be combined. It is possible.

Although each of the above embodiments has described a magnetic disk device using one magnetic disk 1, a magnetic disk device in which a plurality of magnetic disks are arranged in a stacked manner and is provided with a plurality of magnetic heads corresponding to the magnetic disks may also be described. , this invention can be applied.

Further, instead of the retract spring 55 used in each of the embodiments described above, a structure may be used in which the swing arm 7 is rotated using a capacitor (not shown).

[Effects of the Invention] As is clear from the above, according to the configuration of this invention,
At least when the magnetic disk is not rotating and the device is not operating, the magnetic head holding mechanism separates the magnetic head from the magnetic disk, so even if vibration or shock is applied to the magnetic disk device and the magnetic head or magnetic disk vibrates. These do not contact or collide with each other, and damage to both can be prevented, and troubles such as the magnetic head adhering to the magnetic disk due to the influence of humidity or the like during non-operation can also be prevented.

[Brief explanation of drawings]

1 is a plan view of a device showing a first embodiment of the present invention in a non-operating state, FIG. 2 is a view in the direction of the ■ arrow in FIG. 1, and FIG. 3 is a view in the direction of the Figure 4 is a view from the ■ arrow in Figure 1, and Figure 5.
The figure is a plan view of the device showing the first embodiment of the present invention in an operating state, FIG. 6 is a view taken in the direction of the ■ arrow in FIG. FIG. 8 is a plan view of the conventional example, and FIG. 9 is a side view of FIG. 8. 1...Magnetic disk 5...Magnetic head 31.61...Magnetic head holding mechanism

Claims (1)

[Claims] In a magnetic disk device in which the magnetic head records and plays data while floating slightly above the magnetic disk due to the rotation of the magnetic disk, the position where the magnetic head is separated from the magnetic disk surface at least when the magnetic disk is not rotating and the device is not operating. The device is characterized by a magnetic head holding mechanism that holds the magnetic head while the magnetic disk is rotating, and that releases the holding of the magnetic head in response to the airflow generated as the magnetic disk rotates when the device is operating. magnetic disk device.