JPH03295094A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To maintain the disk device in a low moisture state for a long time by using a partition plate having throttled holes so as to divide the inside of a moisture absorbing agent seal case being a sealed package surrounding a magnetic disk into plural parts. CONSTITUTION:A sealed package 1 surrounding a magnetic disk 1 is provided with a moisture absorbing agent seal case provided with a breathing hole 9 in which a moisture absorbing agent 4 is contained. The inside of the case 2 is divided into plural parts by a partition plate having throttled holes 7, 8. The deterioration in the moisture absorbing agent is retarded by the constitution of plural chambers and the inside of the magnetic disk seal package is kept to a low moisture state for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealed magnetic disk device, and more particularly to a sealed magnetic disk device suitable for use in a place where a continuous medium such as sputtering is used as a recording medium.

[Conventional technology]

In the conventional technology, as shown in FIG. 2, a moisture absorbent case 2 having a connection hole 6 and a breathing hole 9 is attached to a part of a sealed container 1, a moisture absorbent 4 is sealed in this case 2, and the moisture absorbent case 2 is attached to a part of a sealed container 1. It had a mechanism to dehumidify the inside.

Incidentally, such a device is, for example, disclosed in Japanese Patent Application Laid-open No. 55-15
No. 7170 is mentioned.

[Problem to be solved by the invention]

The above conventional technology is only devised for the flow path structure between the inside of the sealed container and the inside of the case containing the moisture absorbent. There was a problem in that it was not kept in low humidity for a long time.

[Means to solve the problem]

For the above purpose, use the inside of the case containing the moisture absorbent.

This can also be achieved by partitioning with multiple plates with apertures.

[Effect]

When the outside air passes through the moisture absorbent and the flow path in the case and is guided into the sealed container, a partition plate with a throttle inside the case serves as a passage resistance against the diffusion and intrusion of moisture. In general, moisture absorbers absorb water faster as the humidity difference increases.
This tends to shorten the lifespan. Therefore, by partitioning the room with a plurality of plates having aperture holes, a humidity difference occurs between each partitioned room. Therefore, when the moisture absorbent in the room close to the outside air approaches saturation, the moisture absorbent in the next inner room comes into play, so even if the same amount of moisture absorbent is used, by partitioning the room in this way, There is a significant delaying effect when considering the environmental lifespan of that final room humidity limit.

〔Example〕

Embodiments of the present invention will be described below with reference to FIG.

In FIG. 1, a floating head 11 for recording and reproducing data and a spindle motor 12 for rotating a continuous film recording medium 10 are arranged inside a sealed container 1.

A connecting hole 6 is provided at the corner of the front sealed container 1 to allow air to enter and exit depending on changes in environmental conditions, and a filter 5 is attached to the inside of the sealed container to prevent dust from outside air from entering. . Further, a moisture absorbent enclosing case 2 is arranged on the outer surface of the corner portion of the sealed container 1. The case 2 is provided with a breathing hole 9 and a connecting hole 6, and the inside thereof has a restricting hole 7.
, 8 is used to divide the room into three rooms. Also, 3
A moisture absorbent 4 is sealed in a case 2 partitioned into chambers.

Next, the operation of this embodiment will be explained. Inside a magnetic disk drive, air flows in and out of the device due to heat generated by the motor, etc., but to keep the inside of the device clean, a dust filter is attached to the breathing hole. This breathing air may contain a large amount of moisture.

Highly humid outside air enters the first chamber 13 through the breathing hole 9 of the case 2 and is dehumidified by the moisture absorbent 4. When the moisture absorbent in the first chamber 13 sufficiently absorbs moisture and reaches its water absorption limit, the moisture in the outside air passes through the breathing hole 9 and the throttle hole 8 and enters the second chamber 15.
The moisture is dehumidified by the moisture absorbent 4 in the chamber. When the moisture absorbent 4 in the second chamber 14 reaches its water absorption limit like that in the first chamber 13,
Moisture in the outside air passes through the breathing hole 9 and the throttle holes 8 and 7 and enters the third chamber 1.
5, and at the same time enters the sealed container 1 which houses the disc. The humidity inside the sealed container is approximately equal to the humidity in the third chamber, as shown in FIG. 3. The vertical axis is relative humidity;
The horizontal axis is the environmental lifespan. If the same amount of moisture absorbent is used to divide Case 2 into three rooms, the environmental lifespan will be 5 years when the critical humidity is 70%, which is 2 years longer than the conventional one-room case shown in Figure 4. It has the effect of being

Furthermore, if the structure is sealed except for the breathing hole, such as in a magnetic disk drive, when low-humidity internal air is exhausted through the desiccant case, the moisture in the desiccant will be expelled to the outside and reactivated. Therefore, there is an effect that is actually expected to be longer than the effect shown in FIG. 3.

〔Effect of the invention〕

According to the present invention, even if the same amount of moisture absorbent is used in the magnetic disk drive, it is effective to maintain a lower humidity state for a longer period of time than in the past.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the device of the present invention, FIG. 2 is a sectional view of an example of a conventional device, FIG. It is an explanatory diagram of device life. 1... Sealed container, 2... Moisture absorbent enclosure case, 3...
Partition plate, 4... Moisture absorbent, 6... Connection hole 57... Throttle hole, 8... Throttle hole, 9... Breathing hole.

Claims (1)

[Claims] 1. In a sealed magnetic disk device in which a magnetic disk is surrounded by a sealed container, a breathing hole with a filter is provided in the sealed container, and a case containing a moisture absorbent is attached to the outside of the container, the inside of the case containing the moisture absorbent is attached. A sealed magnetic disk device characterized in that it is divided into a plurality of parts by a partition plate having an aperture hole.