JPS6161195B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in magnetic disk storage devices (hereinafter referred to as magnetic storage devices).

Recently, magnetic storage devices have become increasingly dense, and temperature changes when reading and writing data cannot be ignored, so heaters and temperature detectors are used to ensure that the internal temperature of the magnetic storage device is within a predetermined temperature range. The temperature is controlled within a predetermined range. Therefore, there is no deviation in the relative positional relationship between the magnetic head channel and the magnetic disk track.
Data is read and written accurately.

First, a conventional magnetic storage device will be explained.

Figure 1 shows a conventional magnetic storage device.
a and 1b are magnetic disks, 2a and 2b are magnetic heads, 3a and 3b are head arms, 4 is an actuator, 5 is a main deck, 6 is a motor, 7 is a rotating belt, 8 is a heater, and 9 is a temperature detector.

In the magnetic storage device configured as described above, when the internal temperature of the magnetic storage device falls below (above) a predetermined temperature, a detection signal is generated in the temperature detector 9, the heater 8 is energized (cut off), and the internal temperature is lowered to the predetermined temperature. is controlled by the value of

However, in the conventional magnetic storage device, when the temperature detector 9 malfunctions, overheating of the heater 8 may cause not only data reading/writing errors but also a fire.

This invention aims to improve these problems, and is characterized by using a positive characteristic heat-sensitive resistor (hereinafter referred to as a resistor) as a heat source, and through this resistor, a magnetic storage device is heated within a predetermined temperature range. This paper proposes a magnetic disk storage device that can be heated to

First, the structure and operating characteristics of the resistor, which is a feature of the present invention, will be explained.

2 is a perspective view of the resistor 16, and FIG. 3 is a sectional view of FIG. 2. In the figure, 11 is a barium titanate-based semiconductor, 12 is an electrode, 17 is a terminal, 18 and 19 are other electrodes and terminals, H ₁ to _Ho are through holes, and 15 is a coating.

Figure 4 is a diagram showing the resistance-temperature characteristics of a resistor.
There is a sudden increase in resistance after a certain temperature.

FIG. 5 is a diagram showing the static voltage-current characteristics of a resistor, showing a curve in which the current reaches a maximum at a certain voltage and then decreases.

Also, A in Figure 5 is a through hole in Figures 2 and 3.
H ₁ to _{H o} show voltage-current curves when no air is flowing, and B and C show voltage-current curves corresponding to changes in the air flow rate.

FIG. 6 is a diagram showing the air volume vs. heat value characteristic of the resistor, and a curve in which the heat value changes greatly depending on the flow rate of air is obtained.

In other words, when using a resistor as a heater, this heater can be used as a heat source for a hot air generating device consisting of a heater and a blower, and even if the blower locks up, the heater itself will reduce the amount of heat generated and there is no risk of overheating. There is no.

FIG. 7 shows an embodiment of a memory device according to the present invention, in which the positive temperature thermal resistor shown in FIGS. 2 and 3 is used.

In the figure, 1 to 9 are the same as in Figure 1, and 1
6 is a heater using the above-mentioned resistor, 20 is a blower,
21 is a filter, and the magnetic disk 1
a, 1b, magnetic heads 2a, 2b for these magnetic disks, head arms 3a, 3b that support these magnetic heads, actuator 4 and detector 9 that drive these arms are housed in a closed space on the main deck 5. The heater 16, blower 20, and filter 21 are also arranged within this closed space.

Next, the operation will be explained.

When the internal temperature of the closed space of the storage device is below (above) a predetermined temperature range, a detection signal is sent to the detector 9.
Turned ON (OFF). Further, when the air from the blower 20 is blown in the direction of the arrow 2, the warm air generated by the resistor 16 can be blown in the direction of the arrow H, and can be circulated in the closed space. That is, by installing the resistor 16, the blower 20, and the temperature detector 9 inside the sealed space on the main deck 5 as shown in the figure, the internal temperature of the storage device is reduced by the heat generation effect of the resistor 16. can be controlled within a predetermined temperature range.

Furthermore, by increasing the internal temperature, the relative humidity inside the magnetic storage device is controlled to prevent condensation on the surface of the magnetic disk.

As described above, this invention uses a PTC heat-sensitive resistor and an air blower as a heat source to control the internal temperature of the storage device within a predetermined temperature range, so that errors in reading and writing data in the storage device due to overheating can be prevented. In other words,
The relative relationship between the recording tracks of the magnetic head and the magnetic disk can be maintained correctly. Furthermore, fires due to overheating can be prevented, and dew condensation on the magnetic disk surface can be prevented, which is advantageous in many ways.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional magnetic disk storage device, Fig. 2 is a perspective view of an example of a resistor used in the present invention, Fig. 3 is a sectional view of Fig. 2, and Fig. 4 is a resistance of the resistor. FIG. 5 is a diagram showing the voltage-current characteristic of the resistor; FIG. 6 is a diagram showing the calorific value-flow rate characteristic of the resistor; FIG. 7 is a diagram showing the magnetic disk storage device according to the present invention. In the figure showing the example, 1
a, 1b are magnetic disks, 2a, 2b are magnetic heads, 3a, 3b are head arms, 4 is an actuator, 5 is a main deck, 6 is a motor, 7 is a rotating belt, 8 is a heater, 9 is a temperature detector, 16 is a positive Characteristic heat-sensitive resistor, 17 is a terminal, 18 is an electrode, 19
is another terminal, 20 is a blower, and 21 is a filter. It should be noted that the same or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. A magnetic disk, a magnetic head for the magnetic disk, a head arm supporting the magnetic head, and an actuator for driving the head arm housed in a closed space, including a temperature detector and one or more actuators controlled by the detector. A positive characteristic heat-sensitive resistor and a blower that circulates heat generated from the resistor in the closed space are provided in the closed space, and the temperature in the closed space is always maintained at a predetermined temperature or within a temperature range. A magnetic disk storage device characterized in that the magnetic disk storage device is configured to maintain