JPH04247387A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To offer a magnetic disk device stably operated and with high reliability always keeping relative humidity in an HDA constant without being affected by the temperature in the HDA. CONSTITUTION:This device is comprised so that the relative humidity in the HDA in the magnetic disk device provided with the HDA of CSS system can be kept constant. An inlet port 2 and a control valve 3 which controls the opening/closing of the inlet port 2 are provided at part of a sealed container 1 arranged in the HDA. One terminal of the control valve 3 is mounted to the other terminal of an arm 4 cantilever-supported with the sealed container 1. A dehumidifying material is shown in 6. The arm 4 is formed with shape memory alloy. Therefore, deformation occurs when the temperature in the HDA exceeds certain constant temperature as shown in continuous line, and the control valve 3 closes the inlet port 2, which limits a dehumidifying operation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive employing a CSS type HDA, and more particularly to an HDA structure for preventing failures due to adhesion between a magnetic disk drive and a magnetic disk head.

0002

[Prior Art] In this type of magnetic disk device, when the device is stopped, the magnetic disk in the HDA and the magnetic head are in contact with each other, and when the device starts up and the magnetic disk rotates, the air flow generated as the magnetic disk rotates. The HDA employs a so-called contact start-stop system in which the magnetic head floats above the surface of the magnetic disk. In general, as the recording density of storage media increases, the smoothness of the magnetic disk surface continues to increase.
When the humidity inside the DA exceeds a certain level, the CSS method HDA
In this case, adhesion is likely to occur at the contact surface between the magnetic disk and the magnetic head. In order to prevent this, conventionally, a method shown in FIG. 3 has been adopted. FIG. 3 is a cross-sectional view of a dehumidifying mechanism within an HDA in a conventional magnetic disk drive. In this figure, an air filter 5 is attached to an intake port 2 provided in a part of a sealed container 1. And this container 1
is equipped with a dehumidifying material 6 such as silica gel, and the HDA
The internal humidity is kept below a certain value, thereby preventing adhesion at the contact surface between the magnetic disk and the magnetic head.

0003

[Problems to be Solved by the Invention] Since the dehumidifying mechanism in the HDA of the conventional magnetic disk drive mentioned above is structured to constantly dehumidify using a dehumidifying material, it is difficult to avoid problems such as when the magnetic disk drive is in operation or when the ambient temperature rises. As a result, when the temperature inside the HDA increases, the relative humidity inside the HDA decreases significantly, causing various adverse effects (for example, static electricity is more likely to be generated within the HDA, causing noise during write/read operations). The present invention has been made in view of the above points,
The purpose is to provide a stable and highly reliable magnetic disk device that always maintains the relative humidity inside the HDA within a certain range regardless of the temperature inside the HDA.

0004

[Means for Solving the Problems] In order to achieve the above-mentioned object, a magnetic disk drive according to the present invention sets a certain set temperature in advance in the HDA, performs a dehumidifying operation below this set temperature, and It is equipped with a dehumidification limiting mechanism that stops dehumidifying operation when the temperature exceeds a set temperature, and the dehumidifying limiting mechanism consists of an air intake port provided in a part of a sealed container filled with dehumidifying material, and an on-off valve that opens and closes this air intake port. This opening/closing valve is made of a shape memory alloy or shape memory plastic that opens and closes at the set temperature, and a certain set temperature is set in advance in the HDA, and the humidifying operation is performed above this set temperature. The humidification mechanism includes an air intake port provided in a part of a sealed container filled with humidifying material, and an on-off valve that opens and closes the air intake port, and the on-off valve is opened and closed at the set temperature. It is made of a shape-memory alloy or shape-memory plastic that performs the action.

[0005]

[Operation] In the magnetic disk drive according to the present invention, the dehumidifying operation is performed when the temperature is below the set temperature, the dehumidifying operation is stopped when the temperature is above the set temperature, and the humidifying operation is performed when the temperature is above the set temperature. Constant humidity is maintained.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to the drawings. FIG. 1 shows an HD in a magnetic disk device according to the present invention.
It is a sectional view of the dehumidification restriction mechanism in A. In the figure, the same reference numerals as in the prior art indicate the same configuration, and detailed explanation will be omitted. Reference numeral 3 designates an on-off valve that opens and closes the intake port 2, and one end of which is attached to the other end of an arm 4 supported in a cantilever by the sealed container 1. A feature of this embodiment is that the arm 4 is made of a shape memory alloy or shape memory plastic that remembers its shape at a certain set temperature. The arm 4 configured in this way deforms as shown by the dashed line in the figure when the temperature inside the HDA is below a certain set temperature, and the arm 4 deforms as shown by the dashed line in the figure.
opens the intake port 2 and performs dehumidification operation. Furthermore, when the temperature inside the HDA exceeds the set temperature, the arm 4 returns to the shape shown by the solid line, the on-off valve 3 closes the intake port 2, and the HDA
The dehumidifying operation inside the HDA is stopped to prevent the relative humidity inside the HDA from becoming low due to temperature rise.

FIG. 2 shows another embodiment of the present invention, and is a sectional view of a humidifying mechanism in the HDA of the magnetic disk drive according to the present invention. In the figure, 10 is a humidifying material such as water filled in the sealed container 1. 20 is a waterproof material such as Gore Stick, which seals the humidifying material 10,
The structure is designed to prevent unnecessary water leakage. When the temperature inside the HDA exceeds the set temperature, the shape memory alloy or shape memory plastic forming the arm 4 in this embodiment assumes the shape shown by the dashed line in the figure, and the on-off valve 3 closes the intake port 2. Open it, start humidifying operation,
The relative humidity inside the HDA is controlled so as not to decrease due to temperature rise. Furthermore, when the temperature inside the HDA is below the set temperature, the arm 4 returns to the shape shown by the solid line in the figure.
The on-off valve 3 closes the intake port 2 and stops the humidifying operation.

[0008] It has been confirmed from experimental data that the above-mentioned shape memory alloys and shape memory plastics can control the relative temperature within the HDA within a certain range by selecting the operating temperature. It goes without saying that the dehumidification limiting mechanism of the first embodiment and the humidification mechanism of the second embodiment may be used together if necessary.

[0009]

As described in detail above, according to the magnetic disk drive of the present invention, a certain set temperature is set in advance in the HDA, and dehumidification is performed when the temperature is below this set temperature, and when the temperature is above the set temperature, The HDA is equipped with a dehumidification limiting mechanism that stops the dehumidifying operation, and also has a humidifying mechanism that sets a certain set temperature in advance in the HDA and performs the humidifying operation above this set temperature. Humidity can be controlled within a certain range, and as a result, a stable and highly reliable magnetic disk device can be provided.

[Brief explanation of the drawing]

FIG. 1: HDA in a magnetic disk device according to the present invention
FIG.

FIG. 2: HDA in the magnetic disk device according to the present invention
It is a sectional view of the humidification mechanism inside.

FIG. 3 is a cross-sectional view of a dehumidifying mechanism in an HDA in a conventional magnetic disk device.

[Explanation of symbols]

1 Sealed container 2 Intake port 3 On-off valve 4 Arm 6 Dehumidifying material 20 Humidifying material

Claims (4)

[Claims] [Claim 1] CSS (Contact Star
HDA (Head Disk)
In the magnetic disk device having the HDA, a certain set temperature is set in advance in the HDA,
A magnetic disk drive characterized by having a dehumidification limiting mechanism that performs a dehumidifying operation when the temperature is below the set temperature and stops the dehumidifying operation when the temperature is above the set temperature. 2. The dehumidification limiting mechanism includes an air intake port provided in a part of a sealed container filled with a dehumidifying material, and an on-off valve that opens and closes the air intake port, and opens and closes this on-off valve at the set temperature. 2. The magnetic disk device according to claim 1, wherein the magnetic disk device is made of a shape-memory alloy or a shape-memory plastic. 3. A magnetic disk device having a CSS type HDA, characterized in that the HDA is provided with a humidifying mechanism that sets a certain temperature in advance and performs a humidifying operation above the set temperature. disk device. 4. The humidifying mechanism includes an intake port provided in a part of a sealed container filled with humidifying material, and an on-off valve that opens and closes the intake port, and the on-off valve is opened and closed at the set temperature. 4. The magnetic disk device according to claim 3, wherein the magnetic disk device is made of a shape memory alloy or a shape memory plastic.