JPS5922274A - Sealed type magnetic disc device - Google Patents

Abstract

PURPOSE:To keep the humidity inside a disc room especially at a low value at the stop of a magnetic disc device and to elongate the life of a dryer by accommodating a dryer case storing the dryer, having a small hole on its surface and a cover to be closed at the rotation of a disc and opened at the stop of the rotation. CONSTITUTION:A filter is set up on one side of the dryer case 8 to prevent the scattering of dust of a water absorbing agent, the whole surface of the side is provided with a cover 9 to be opened and closed and a spring-like actuator 10 inserted and coupled into/with the inside of the magnetic disc is fitted to the surface of the cover 9. During the stop of the disc 3, the cover 9 is kept opened by the spring of the actuator 10 and the dryer 12 displays the water absorbing property at the maximum. When the disc 3 is turned, the cover 9 is closed by the wind pressure applied to the actuator 10 and the water absorbing property of the dryer 12 is limited. To prevent the complete interruption of the water absorbing function at the closed time of the cover 9, a small hole 11 is drilled and some water absorbing function is kept also during the rotation of the disc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed magnetic disk device, and more particularly to a sealed magnetic disk device including an internal moisture absorption mechanism of the magnetic disk device.

A conventional sealed magnetic disk device includes a magnetic disk, a magnetic head for reading and writing when the magnetic disk rotates, and a desiccant container containing a desiccant and having a small hole.
The apparatus includes a cover that seals and accommodates the magnetic disk, the magnetic recording head, and the desiccant container.

Next, a conventional sealed magnetic disk device will be described in detail with reference to the drawings.

FIG. 1 is a front view showing a conventional example, and FIG. 2 is a graph showing changes in temperature and humidity in the conventional example shown in FIG.

The conventional sealed magnetic disk drive shown in FIG. Stored in a sealed container.

The cover 2 is provided with a breathing hole through which air enters and exits depending on the pressure difference between the inside and outside, and a filter 7 is provided to keep the inside of the trench dust-free.

In magnetic disk drives that use the so-called contact start-stop method, in which the magnetic head 6 is in contact with the surface of the magnetic recording medium when the magnetic disk 3 is stopped, there is a risk that the magnetic head and the recording medium will stick together when the magnetic disk 3 is stopped, and high humidity may occur. It tends to happen at the bottom.

Furthermore, such a magnetic disk device is equipped with a desiccant container 8 containing a desiccant 12 in order to keep the interior at low humidity.

However, since the magnetic disk chamber is in a sealed state, the internal humidity changes as shown in FIG. 2 due to the difference in temperature between when the apparatus is stopped and when it is in operation. That is, the temperature of the indoor air, which is maintained at a constant humidity when the device is in operation, decreases when the device is stopped, and the relative humidity gradually increases. Once the device is completely cooled, the humidity will be maintained. - Even if a desiccant is installed inside the chamber, the entrance and exit are narrowed to extend the life of the desiccant, so it cannot cope with sudden changes in humidity inside the sealed chamber. There was a drawback that the internal humidity became stagnant when the temperature dropped immediately after stopping.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sealed magnetic disk device in which the humidity in a sealed magnetic disk chamber can be kept particularly low when the device is stopped, and the life of the desiccant can be extended.

A sealed magnetic disk device of the present invention includes a magnetic disk;
a magnetic head for reading and writing when the magnetic disk rotates; a desiccant container containing a desiccant and having a small hole; a desiccant container having a lid that closes when the magnetic disk rotates and opens when the magnetic disk stops; The device includes a cover that seals and houses the magnetic head and the desiccant container.

That is, in the sealed magnetic disk device of the present invention, a desiccant container that absorbs moisture inside the sealed magnetic disk device that houses a rotating magnetic disk and a magnetic head that performs reading and writing is used to prevent the startup and stop of the disk. It consists of a lid that is linked to the

That is, the sealed magnetic disk device of the present invention is configured such that the rotating magnetic disk and the lid of the desiccant container for the purpose of absorbing moisture in the sealed container covering the rotating magnetic disk can be opened and closed in conjunction with the start and stop of the device. Ru.

That is, in the sealed magnetic disk device of the present invention, the lid of the desiccant container can be opened and closed by the wind pressure accompanying the rotation of the magnetic disk, so that the desiccant lid is fully opened when the rotation is stopped, and closed during rotation to prevent the desiccant from being removed. By increasing or decreasing the effect.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a front view showing an embodiment of the present invention, and the sealed magnetic disk device shown in FIG.
The magnetic head 6 for reading and writing information and the voice coil motor 5 for driving the magnetic head 6 are mounted in a sealed case except for the breathing hole, which is the same as in the conventional case.

In the embodiment shown in FIG. 3, one side of the desiccant container 8 containing the desiccant 12 is provided with a lid 9 that can be opened and closed once.

As shown in FIG. 4 in detail, one side of the desiccant container 8 is provided with a filter to prevent dust from the moisture absorbent inside from scattering. The entire surface thereof is covered with a lid 9 that can be opened and closed, and a spring actuator 1o that is connected and inserted into the inside of the magnetic disk 3 is attached.

Now, while the magnetic disk 3 is stopped, the lid 9 is in a closed state due to the spring of the actuator 10, and the desiccant 12 is exerting its moisture absorption ability. Here magnetic disk 3
When the actuator 10 rotates, the lid 9 is closed by the wind pressure applied to the actuator 10, and moisture absorption of the desiccant 12 is restricted. The lid 9 is provided with a small hole 11 to prevent the moisture absorbing function from being completely lost when the lid 9 is closed, so that a certain amount of moisture can be absorbed even while the disk is rotating.

In this way, when the disk is stopped, it is rapidly dehumidified to prevent the magnetic head from adhering to the recording medium.
The life of the desiccant 12 can be extended without performing unnecessary dehumidification when the magnetic disk 30 rotates.

Sealed type of the present invention +19! By adding a lid to the desiccant container that opens and closes in conjunction with the rotation of the magnetic disk, the air disk device opens the lid when the magnetic disk stops.
Since the humidity that increases when the apparatus is stopped can be easily absorbed, the inside of the magnetic disk drive chamber can be maintained at a low level of humidity when the apparatus is stopped.

That is, the sealed magnetic disk device of the present invention maintains lower humidity when the device is stopped by providing inside the sealed magnetic disk device a desiccant container with a lid opening/closing mechanism linked to the rotation of the disk. , has the effect of extending the life of the desiccant.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a conventional sealed magnetic disk device, and FIG. 2 shows the state when the magnetic disk chamber shown in FIG. 1 is stopped.
A graph showing changes in temperature and humidity at startup. FIG. 3 is a top view of a magnetic disk device equipped with a desiccant container according to an embodiment of the present invention, and FIG. 4 is a detailed perspective view of the desiccant container shown in FIG. 3. 1...Base, 2...Cover, 3...
Magnetic disk, 4... Drive motor, 5...
・Voice coil motor, 6...Magnetic head% 7
... Breathing filter, 8 ... Desiccant container,
9... Lid, 10... Actuator Fig. 1 [knee 373 = Pu 8

Claims (1)

[Claims] a magnetic disk, a magnetic head for reading and writing when the magnetic disk rotates, a desiccant container containing a desiccant and having a small hole and a lid that closes when the magnetic disk rotates and opens when the magnetic disk stops; What is claimed is: 1. A sealed magnetic disk device comprising: a cover for sealingly accommodating a magnetic disk, the magnetic head, and the desiccant container.