JPS6282591A - Enclosed magnetic recorder - Google Patents

Abstract

PURPOSE:To obtain an enclosed magnetic recorder that can reduce heat-off track phenomena and deterioration of each part of the recorder with high density and high reliability, by providing a heat absorbing space inside a container of the recorder and a heat dissiparing space outside the container with is linked to said heat absorbing space respectively and putting the refrigerants into both spaces to cool the inside of the container by the evaporation and condensation of those refrigerants. CONSTITUTION:A container 3 storing the primary component elements of a magnetic disk device contains a heat absorbing member 17 having a heat absorbing space 15 inside a form shaped along the upper inner wall, the side inner wall and the inner walls at both end parts in the lengthwise direction having a semicircular form respectively of the container 3. An end of a link pipe 19 is connected to the upper surface of the member 17. While a heat dissipating member 23 having a heat dissipating space 21 formed inside the container 3 along its upper outer wall is connected to the other end of the pipe 19. Then a heat transmitting refrigerant 31 that fills approximately the space 15 is enclosed into both spaces linking with each other. The refrigerant 31 is evaporated within the space 15 by the temperature of the container inside 5 and then condensed within the space 21 by the temperature on the outside of the container 3 in an active mode of the magnetic disk device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a technique for improving the heat dissipation characteristics of a closed magnetic recording device in which each mechanical part is housed in a closed container.

[Technical background of the invention and its problems] In general, in order to achieve large capacity and high enrichment, magnetic disk devices apply the principle of gas bearings to magnetic recording media (magnetic disks) with submicron order. A floating RAD slider is used to float the electromagnetic conversion head with a gap of . Since this floating RAD slider operates through an extremely small gap between the magnetic disk that rotates at high speed, even a small amount of dust in the floating gap can cause the head to come into contact with the magnetic disk, causing damage to the head (head crash).
Therefore, in order to ensure the reliability of the device, it is required to keep the gas inside the device, especially around the magnetic disk head, as clean as possible.

In order to realize this, conventionally, as shown in FIG.
The structure is such that the main components of the magnetic disk device such as the above are completely sealed from the external environment in a container 109, and the sliding parts of the bearings that cause dust are completely sealed using magnetic fluid or the like. .

By the way, in such a sealed magnetic disk device, 300 stacked magnetic disks 101 are packed together with other main components in a narrow space with high density.
It rotates at a high speed of Orpm or higher. Therefore, in a sealed magnetic disk drive, the viscosity between the magnetic disk surface and the internal gas is a! Due to heat generation due to friction (windage damage),
This will result in a considerable temperature rise. Further, a drive unit of the head positioning mechanism 107 that performs a high-speed random seek operation,
Heat generated from the spindle drive motor (rotary support system 103) also contributes to an increase in the temperature of the device.

It goes without saying that a rise in the temperature of a magnetic disk device accelerates the deterioration of each component of the device and shortens the life of the device, but the biggest problem is due to thermal expansion or uneven temperature distribution due to the rise in temperature of each component. This is the track deviation (thermal off-track) of the magnetic disk 101 due to the difference in thermal expansion, and this has been a factor that has hindered improvement in the track sound intensity and, by extension, in the recording density of the magnetic disk device.

However, in the above-mentioned conventional device, since the container 109 has a nearly completely sealed structure, cooling mainly involves dissipating the heat conducted through the walls of the container 109 to the cooling air passing through fins provided on the outer wall of the container 109. was at best.

In FIG. 10, the temperature drop state from the inside of the device to the outside air through the wall of the container 109 is shown by a dashed line.
It can be seen that there is a considerable temperature difference at the interface between the wall surface of the container 109 and the air, and the thermal resistance here is large. In particular, it can be seen that this temperature difference is relatively smaller at the interface of the inner wall of the container 109 than at the interface of the outer wall. This is container 109
Due to the high speed rotation of the magnetic disk 101, the gas inside the container 1 forms a fairly high-speed flow of several tens of m/s.
While the inner wall of container 109 exchanges heat with the internal gas relatively easily compared to the outer wall, the air flow velocity on the outer wall of container 109 is low, at most several m/s or less, and heat transfer is difficult. This is thought to be due to relatively poor characteristics.

In any case, in a conventional sealed magnetic disk device, there is no doubt that the thermal resistance at the interface between the surface of the container 109 and the air is the main factor that hinders the improvement of the heat dissipation characteristics of the device. In order to reduce the thermal off-track caused by the upper temperature limit of the device, which is mainly caused by wind damage with the internal gas, and to realize a high-speed access, high-density sealed magnetic disk device, a fairly large-scale installation is required. This had the disadvantage of requiring a cooling unit.

[Purpose of the Invention] The present invention was made by focusing on such conventional problems, and by improving heat dissipation characteristics, windage loss caused by relative movement with a magnetic recording medium head can be eliminated as a main factor. The purpose of the present invention is to provide an inter-sonic magnetic disk device that can suppress the temperature rise inside the device and realize high recording density and high-speed access with little thermal off-track.

[Summary of the Invention] To achieve this object, the present invention stores main components of a magnetic recording device such as a magnetic recording medium and a head in a sealed container, and forms an endothermic space inside the container. At the same time, a heat dissipating member is provided which communicates with the heat absorbing space and forms a heat dissipating space outside the container above the heat absorbing space, and within this heat absorbing and heat dissipating space, the inside of the container in the operating state of the sealed magnetic recording device is provided. evaporates at a temperature of
In addition, the structure is such that a cooling element that condenses at the temperature outside the container is enclosed.

[Operation of the invention] The temperature inside the container increases due to the operation of the magnetic recording device. The refrigerant in the endothermic space inside the container absorbs the heat due to this temperature rise and evaporates, and the latent heat of vaporization at this time cools the inside of the container. The evaporated refrigerant flows into the heat radiation space outside the container, where the heat carried by the refrigerant is cooled by the outside air and condensed. By repeating such a cycle of evaporation and condensation of the refrigerant, heat is radiated within the container, and a rise in temperature within the apparatus is suppressed.

[Example] The present invention will be explained in detail below.

FIGS. 1 to 3 show a first embodiment of the present invention, and the structure thereof will be explained first.

A container 3 is attached to the base 1 with the interior 5 of the container sealed. A plurality of stacked magnetic disks (magnetic recording media) 7 are housed inside the container 5, and the magnetic disks 7 are rotatably supported by a spindle 9, which is further driven by a drive motor (not shown) inside the base 1. This drive motor, spindle 9, etc. constitute a drive mechanism.

Although not shown inside the container 5, a head and a head support system for recording and reproducing information are mounted on a magnetic disk 7, which is substantially similar to that shown in FIG. A head positioning mechanism for positioning the head is housed.

The container 3 that seals and stores the main components of the magnetic disk drive is attached to the base 1 with an opening 11 on the base 1 side and with the end surface 13 on the side of the opening 11 in contact with the side surface 1a of the base 1. It is.

A heat absorbing member 17 having a heat absorbing space 15 inside the container 3 is housed in a shape along the inner wall on the upper side of the container 3, the inner wall on the side side, and the inner wall on both ends in the longitudinal direction of the container 3 having a semicircular cross section. There is. The inner surface of the heat absorbing member 17 is provided with a plurality of convex portions 17a that increase the volume within the heat absorbing space 15 and increase the contact area with the gas inside the container 5.

One end of one communication pipe is connected to the upper surface of the heat absorbing member 17,
The other end of the communication pipe 19 is connected to a heat radiating member 23 that is disposed along the outer wall of the upper surface of the container 3 and has a heat radiating space 21 inside. installed.

The heat absorption member 17, the communication pipe 19, and the heat radiation member 23 connected to each other are attached to the container 3 by inserting the communication pipe 19 into the opening 11 of the container 3 through a notch 27 formed approximately at the center of the upper surface of the container 3. It is inserted from the side. Communication pipe 19
A sealing material 29 is used to seal the space between and the notch 27 .

The heat absorbing member 17, the communication pipe 19 and the heat dissipating member 2
A heat transfer refrigerant 31 that substantially fills the heat absorption space 15 is sealed in a space that communicates with each other. This refrigerant 31 evaporates in the heat absorption space 15 at the temperature inside the container 5 when the magnetic disk device is in operation, and condenses in the heat radiation space 21 at the temperature outside the container. The absorbed heat is released to the outside during condensation. That is, this heat dissipation mechanism performs a cooling action based on the heat vibration principle.

A fan 33 is disposed on the left side of the heat radiation fin 25 in FIG. 1 to improve the heat radiation effect.

In a sealed magnetic disk device with such a heat dissipation mechanism, when the device is operated, the magnetic disk 7 is rotated at high speed, resulting in viscous friction (windage loss) between the surface of the magnetic disk 7 and the gas (air). The temperature of the magnetic disk device rises due to heat generation and further heat generation from the drive unit of the head positioning mechanism (not shown) that performs high-speed random seek operations and the drive motor of the spindle 9, and the temperature inside the container 5 also rises.

The heat due to this temperature rise is transferred to the heat transfer refrigerant 3 in the heat absorption space 15.
1 is absorbed and the liquid heat transfer refrigerant 31 evaporates. The latent heat of evaporation at this time cools the inside of the container 5, thereby suppressing a rise in temperature of the magnetic disk device. The evaporated refrigerant is
It flows into the heat radiation space 21 through the communication pipe 19, is cooled by the outside air through the heat radiation fins 25, radiates heat, condenses, becomes liquid again, and drips into the heat absorption space 15. By repeating such a cycle of evaporation and condensation of the heat transfer refrigerant, heat within the magnetic disk device is efficiently radiated.

FIG. 4 shows another embodiment of the heat radiating mechanism in which the heat absorbing member 17, the connecting pipe 19, and the heat radiating member 23 in the embodiment shown in FIG. 1 described above are integrated.

By tilting the heat dissipating member 23 so that both ends of the heat dissipating member 23 are positioned above the center side, the heat transfer refrigerant condensed in the heat dissipating space 21 can be smoothly transferred to the heat absorbing space 21.
I try to drip it at 5.

Note that here, the same components as in the above-described embodiment are given the same reference numerals.

FIG. 5 shows a second embodiment. In this embodiment, a heat absorbing member 17 installed inside the container 5 and a heat radiating member 23 installed outside the container are placed near the side wall of the upper surface of the container 3.
The heat absorption space 15 and the heat radiation space 21 are directly connected through a through hole 35 provided along the longitudinal direction of the heat absorption space 15 and the heat radiation space 21 . Through hole 35 and heat absorbing member 17 or heat dissipating member 2
3 is sealed by a sealing member 29. With such a structure, the circulation resistance of the heat transfer refrigerant 31 between the heat absorption space 15 and the heat radiation space 21 can be reduced 1, and a further improvement in cooling efficiency can be expected.

FIG. 6 shows a third embodiment. In this embodiment, the heat absorbing member 17 and the heat dissipating member 23 installed inside and outside the container 3 are formed of plate-like members, the outer edge of the plate-like member is bent, and the bent end is connected to the inner wall of the container 3. and the outer wall, thereby forming a heat absorption space 15 and a heat radiation space 21 using the container 3, and the same space 15.
21 are communicated with each other through a communication hole 37 formed in the container 3. In this structure, processing of the heat absorbing member 17I3 and the heat dissipating member 23 is easier than in the case of forming the heat absorbing member 17I3 and the heat dissipating member 23 into a bag shape in each of the above-described embodiments. The reduction is smaller than in each of the above-mentioned embodiments, and between devices having the same volume inside the container, the internal volume can be increased and the temperature rise inside the container 5 can be reduced.

Note that the magnetic disk and the like housed inside the container 5 are omitted here.

FIGS. 7 and 8 show a fourth embodiment. In this embodiment, as in the embodiment shown in FIG. 6, the heat absorbing member 17 and the heat dissipating member 23 are each formed of a plate-like member, and the outer edge of the plate-like member is bent, and each bent end portion 17a, 23a
are joined to each other to form a heat absorption space 15 and a heat radiation space 21.

Further, a plurality of heat dissipation fins 25 are provided on the upper surface of the heat dissipation member 23, and a second heat dissipation space 41 communicating with the heat dissipation space 21 is formed below the heat dissipation fins 25. The heat transfer refrigerant 31 is enclosed in a manner that substantially fills the heat absorption space 15.

On the other hand, on the upper surface of the container 3, there are heat absorbing members 17 connected to each other.
A rectangular through hole 43, which is slightly larger than the outer diameter of the heat radiating member 23, is bored, and the heat absorbing member 17 is placed in the through hole 43 on the inside 5 side of the container, and the heat radiating mechanism is inserted through two sealants. is installed.

With this configuration, the heat dissipation mechanism is arranged in the n-through hole 43, which has a relatively large size for the heat dissipation mechanism, so that the heat dissipation mechanism can be easily manufactured without being constrained by processing tolerances. Since the heat absorption space 15 and the heat radiation space 21 are integrated, circulation due to evaporation and condensation of the heat transfer refrigerant is performed extremely smoothly, resulting in high cooling efficiency. Furthermore,
Since the heat transfer refrigerant after evaporation enters a portion of the heat radiation fins 25, the heat radiation area increases, and the cooling efficiency can be further improved.

In each of the second to fourth embodiments described above, the same components as those in the first embodiment are given the same reference numerals, and other structures and operations that are not explained are the same as in the first embodiment. It is.

[Effects of the Invention] As described above, according to the present invention, a heat absorption space is provided inside the container of a sealed magnetic recording device, and a heat radiation space communicating with the heat absorption space is provided outside the container, and a refrigerant is sealed in both spaces. However, since the inside of the container is cooled by evaporation and condensation of this refrigerant, there is no need to install a separate large-scale cooling mechanism.
Compared to the conventional method of simply attaching heat dissipation fins to the outer wall of the container, the heat dissipation characteristics are significantly improved, and the temperature rise inside the equipment due to wind damage can be suppressed, reducing heat off-track and deterioration of various parts of the equipment. This makes it possible to realize a sealed magnetic recording device with high richness and high reliability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a sealed magnetic disk device according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. An exploded perspective view, FIG. 4 is a sectional view showing another example of the heat dissipation mechanism in FIG. 1,
FIG. 5 is a perspective view showing the heat dissipation mechanism of the second embodiment, FIG. 6 is a cross-sectional view of the sealed magnetic disk device of the third embodiment, and FIG. 7 is the heat dissipation mechanism of the fourth embodiment. A perspective view, FIG. 8 is an enlarged sectional view of the heat dissipation mechanism in FIG. 7, FIG. 9 is a sectional view of a conventional sealed magnetic disk device, and FIG. 10 is a container wall device in the device of FIG. 9. FIG. 3 is an explanatory diagram showing temperature changes between the inside and the outside. 3... Container 7... Magnetic disk (magnetic recording medium) 15... Heat absorption space 17... Heat absorption member 21... Heat radiation space 23.
...Heat radiation member 31...Heat transfer refrigerant 3: Container 15: Heat absorption space 17: Heat absorption member Fig. 2 Fig. 4 Fig. 5 Fig. 6

Claims (1)

[Claims] A magnetic recording medium, a head for recording and reproducing information on the magnetic recording medium, a drive mechanism for generating relative movement between the magnetic recording medium and the head, and a drive mechanism for positioning the head at a predetermined position on the magnetic recording medium. In a sealed magnetic recording device having a head positioning mechanism for positioning and housing the head positioning mechanism in a sealed container, a heat absorbing member forming a heat absorption space is provided inside the sealed container, and the heat absorption space is A heat radiating member is provided to form a heat radiating space outside the container above the heat absorbing space, and evaporates in this heat absorbing and heat radiating space at the temperature inside the container when the sealed magnetic recording device is in operation. A closed magnetic recording device characterized in that a refrigerant that condenses at a temperature outside the container is sealed.