JPH0512848A - Humidity adjustor for magnetic disk - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a humidity control device for a magnetic disk capable of stably controlling the humidity inside the magnetic disk device for a long period of time. A case 23 having a moisture absorption hole 23a communicating with the main body 21 and a ventilation hole 23b communicating with the outside air and connected to a magnetic disk device main body 21 and containing a moisture absorbent 24 is provided. The case 23 is provided with a heater 26 for heating the hygroscopic material 24 to recover the hygroscopic ability, and a shape memory alloy made of a Ti—Ni alloy which is expanded by the heat of the heater 26 and opens and closes the hygroscopic hole 23a and the vent hole 23b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a humidity controller for a magnetic disk device.

[0002]

2. Description of the Related Art FIG.
FIG. 2 is a vertical cross-sectional view showing a filter device incorporating a humidity adjusting device in a conventional magnetic disk device disclosed in Japanese Patent Publication No. JP-A-2003-242, wherein 1 is a circulation filter, 2 is a breathing filter, 3 is humidity adjusting means, 4 Is the casing.
FIG. 3 shows a humidity adjusting device in a conventional magnetic disk device disclosed in, for example, Japanese Utility Model Laid-Open No. 63-91899, in which 11 is a case, 12 is a hygroscopic agent, 13 is a cushion, 14 is a filter paper, and 15 is a recess. , 16 are partition walls, 17 is a sealing material, 18 is a lid, and 19 and 20 are ventilation small holes.

The filter device shown in FIG. 2 is composed of a filter for air flow during operation of the magnetic disk device and a humidity adjusting means for removing moisture in the air by a method such as adsorbing moisture in the air. And keeps low humidity. Further, in FIG. 3, a humidity adjusting device containing a hygroscopic agent is built in the magnetic disk device to maintain low humidity.

[0004]

Since the conventional humidity adjusting device in the magnetic disk device is constructed as described above, the hygroscopic property of the hygroscopic agent deteriorates with time, and finally the function as the humidity adjusting device disappears. .. Therefore, there is a problem that the humidity cannot be adjusted stably over a long period of time, such as the need to replace the hygroscopic agent.

The present invention has been made to solve the above problems, and an object thereof is to obtain a humidity adjusting device for a magnetic disk, which can stably adjust the humidity inside the magnetic disk device for a long period of time. ..

[0006]

A humidity control device for a magnetic disk according to the present invention is provided so as to be connected to a magnetic disk device main body and has a moisture absorption hole communicating with the main body and a ventilation hole communicating with the outside air. It is provided with a case accommodating the material, a heater for heating the hygroscopic agent to recover the hygroscopic ability, and a shape memory alloy for expanding and contracting by the heat of the heater to open and close the moisture absorbing hole and the vent hole.

[0007]

In the humidity control apparatus according to the present invention, the shape memory alloy is expanded by heating by the heater to close the moisture absorption holes and open the ventilation holes. In addition, the adsorbed water of the hygroscopic agent is released by heating and goes out through the open ventilation hole. Then, the temperature of the heater is lowered, the ventilation hole is closed and the moisture absorption hole is opened, the internal atmosphere of the magnetic disk device is cut off from the external atmosphere, and the moisture absorbent recovers the moisture adsorption capacity as the temperature lowers, thereby reducing the humidity inside the magnetic disk. Lower.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is a schematic perspective view showing a magnetic disk device provided with a humidity adjusting device, and FIG. 1B is an enlarged schematic sectional view showing the humidity adjusting device. In the figure, 21 is a magnetic disk device body, 22 is a magnetic disk device body 21.
It is a humidity adjusting device provided inside. Reference numeral 23 denotes a case of the humidity control device 22, which is a moisture absorption hole 23 communicating with the device body 21.
a has a vent hole 23b communicating with the outside air, and the moisture absorbent 2
4. In this case, it contains silica gel. Reference numeral 25 is a filter arranged in the moisture absorption hole 23a, 26 is a heater for heating the hygroscopic agent 24 to restore the hygroscopic capacity, in this case, an insulating coating heater, 26a is an input terminal of the heater 26, 26b is an insulating material, and 27a is A shape memory alloy, in this case, a Ti—Ni alloy having a transformation start temperature of 40 to 50 ° C., is expanded by heating the heater 26 and the valve 30a is closed. 27b is a shape memory alloy, and in this case as well, the transformation start temperature is 40 to 50.
The Ti—Ni alloy at a temperature of 0 ° C. is expanded by the heating of the heater 26 and the valve 30b is opened. Numerals 28a and 28b are elastic coils that contract the shape memory alloys 27a and 27b when the temperature is lowered, and 29 is a shape memory alloy 27a and 27b.
Is a support metal that fixes one end of the.

The humidity adjusting device 22 having the above-mentioned structure
At the same time as the operation of the magnetic disk device is started, the heater input terminal 26a is energized to heat the heater and raise the temperature. The temperature rise causes the shape memory alloys 27a and 27b to extend in a straight line, the valve 30a is closed and the moisture absorption hole 23a is closed to shut off the atmosphere inside the magnetic disk device, and the valve 30b is opened to allow the humidity adjusting device 22 to operate through the ventilation hole 23b. Communicate with the outside. Then, the moisture adsorbed by the hygroscopic agent 24 is released and goes out of the magnetic disk system. On the other hand, when the operation is stopped, the temperature of the heater 26 is lowered, the shape memory alloys 27a and 27b are bent by the coils 28a and 28b, the valve 30a is opened, and the magnetic disk device main body 21 and the humidity adjusting device 22 communicate with each other through the intake hole 23a. The valve 30b is closed and the humidity adjusting device 22 is shut off from the external atmosphere. Hygroscopic agent 2
In No. 4, the moisture absorption capacity is restored as the temperature is lowered, and the moisture in the magnetic disk device is adsorbed to maintain the inside of the magnetic disk device at low humidity.
As described above, the adsorbed water of the hygroscopic agent 24 is released during operation,
By allowing the adsorbent 24 to exert its adsorbing ability during the stop, the hygroscopic agent 24 can be used semipermanently and need not be replaced. Therefore, the humidity inside the magnetic disk device can be adjusted stably over a long period of time.

In the above embodiment, the structure in which the hygroscopic capacity of the hygroscopic agent is automatically restored during the operation of the magnetic disk device has been described. You may make it heat and may recover a hygroscopic capacity. Further, as the shape memory alloy, a Ti—Ni alloy having a transformation start temperature of 40 to 50 ° C. is shown. Alloys are used. For example, those having a transformation start temperature of -50 to 100 ° C and a hysteresis (reverse transformation start temperature-transformation start temperature) of -30 ° C are suitable. Further, the hygroscopic agent may be any one as long as its hygroscopic ability is restored by heating and it is repeatedly used.

[0011]

As described above, according to the present invention, the humidity adjusting device for the magnetic disk is provided by being connected to the main body and has the moisture absorption hole communicating with the main body and the ventilation hole communicating with the outside air. Since the case containing the agent, the heater that heats the hygroscopic material to recover the hygroscopic ability, and the shape memory alloy that expands or contracts by the heat of the heater to open and close the moisture absorbing hole and the vent hole, There is an effect that the humidity can be adjusted stably over a long period of time.

[Brief description of drawings]

FIG. 1 is a sectional view showing a humidity adjusting device for a magnetic disk according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a filter device incorporating a humidity adjusting means in a conventional magnetic disk device.

FIG. 3 is a cross-sectional view showing a humidity adjusting device in a conventional magnetic disk device.

[Explanation of symbols]

 21 Magnetic Disk Device Main Body 22 Humidity Adjusting Device 23 Case 23a Moisture Absorption Hole 23b Vent Hole 24 Moisture Absorber 26 Heater 27a, 27b Shape Memory Alloy

Claims (1)

Claim: What is claimed is: 1. A case and a hygroscopic material, which are provided so as to be connected to a main body of a magnetic disk device, have a moisture absorption hole communicating with the main body and a ventilation hole communicating with the outside air, and which contains a hygroscopic agent. A humidity adjusting device for a magnetic disk, comprising a heater for heating and recovering the hygroscopic ability, and a shape memory alloy for expanding or contracting by the heat of the heater to open and close the moisture absorbing hole and the vent hole.