JPH03219487A - Cooling device and optical information recording and reproducing device having the same - Google Patents

Abstract

PURPOSE:To eliminate dust attached on a filter and to recover a cooling effect by reversing the direction of a fan with the filter as necessary. CONSTITUTION:During the ordinary action time of a device, outside air is exhausted to the outside by the fan through a passage shown by an arrow and it cools the main unit of a magneto-optical disk. When the device is used for a long time, the filter 1 is clogged, air quantity is reduced and the temperature of the main unit of the disk is raised. Then, the fan 3 is rotated in a reverse direction in a prescribed time after a fixed time when a power source is turned on. Besides, an AC signal is added to the piezoelectric element of an exciter 2. Then, the dust attached on the outside of the filter 1 is eliminated.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a cooling device used in a device having a heat generating element such as a drive body, and particularly to a cooling device used in an optical information recording/reproducing device such as a magneto-optical disk device. The present invention relates to a cooling device.

[Prior Art] Conventionally, magneto-optical disk devices have generated a lot of heat due to the operation of laser diodes, their control circuits, and the like. Moreover, as a recent trend, it is necessary to downsize devices, and the current situation is that devices are forced to have a configuration with a small capacity and a large heat source. This generated heat not only had a negative effect on the parts that made up the device, but in some cases, the recorded information could be erroneous, causing the device to lose its original function. For this reason, it is necessary to devise ways to dissipate the generated heat to the outside of the equipment, so by providing many holes for heat radiation on the outer wall of the equipment, and/or using a cooling fan to I dealt with this problem by creating an air flow. However, because magneto-optical disk drives have many precision parts and are extremely sensitive to dust, the holes in the outer wall are subject to major restrictions on the position, size, and shape, and a filter device is required to prevent dust from passing through the cooling fan. was being administered.

[Problem to be solved by the invention] However, if the shape and position of the holes in the outer wall shown in the above conventional example are modified to prevent dust from entering,
The cooling efficiency with respect to the amount of heat generated by the device was extremely low, resulting in insufficient effects. In addition, when forced cooling using a fan, the ingress of dust is noticeable, so a filter was installed outside and/or inside the fan when viewed from the device to prevent this, but dust adhesion may accumulate on the filter over time. As the amount of air increases, the amount of air that the fan sends into the device decreases in inverse proportion to this, and the cooling effect tends to gradually decrease. For this reason, in the case of devices that are configured to be forcibly cooled by a fan, it is necessary to clean or replace the filter section periodically or occasionally, but due to the nature of magneto-optical disk devices as auxiliary recording and reproducing devices, In many cases, the device is incorporated into a larger system to be controlled, and the filter cannot be easily replaced or cleaned, and in these cases, the temperature inside the device increases over time. There was a problem with putting it away.

[Means and effects for solving the problem] According to the present invention, when incorporated into a large system as described above,
Even if it is difficult to replace the fan due to circumstances,
By temporarily rotating the fan in the opposite direction, dust attached to the filter can be removed and the cooling effect of the fan can be maintained.

[Embodiment] FIG. 1 shows a magneto-optical disk device embodying the present invention, and FIG. 2 shows the operation of the present invention. Here, 1 in Figure 1
2 is a filter for preventing external dust from entering the inside of the magneto-optical disk device, and 2 is a piezoelectric element for vibrating the filter. Reference numeral 3 denotes a fan for cooling heat sources such as the drive body and electric circuits in the magneto-optical disk device, which introduces cold air from the outside into the device.

Sanpo noko 5 is a main unit in the magneto-optical disk device, and includes a spindle motor 13 that rotates the magneto-optical disk 11, a spindle servo circuit 12 that controls the spindle motor 13, and a spindle servo circuit 12 that reproduces information on the disk. and/or an optical head 10 equipped with a laser source for recording and a plurality of optical components, and a focusing servo circuit 14 that focuses and tracks the optical head with respect to the disk based on an error signal detected from the optical head. , a tracking servo circuit 15, and the like are provided.

A control board 6 operates the optical head 1O, spindle motor 13, cooling fan 3, piezoelectric element 2, etc. using signals from an external host computer. 7 is a partition plate, which allows the cold air sucked in by the fan 3 to escape to the outside through a designated passage.

Reference numeral 8 denotes an exhaust port, which has a valve-like structure, and the flow of air is restricted to one direction outside the device.

The intake valve 9 is necessary for the present invention, and has a valve structure that allows outside air to be quickly introduced into the device with low air resistance, and is used only for intake.

Next, to explain the operation, as shown in Figure 2, during normal operation of the device (the fan is driven when the power is turned on), the outside air is exhausted by the fan through the path shown by the arrow, and the photomagnetic The structure is designed to cool the main unit of the magneto-optical disk, but after long-term use, the filter shown in a in Figure 1 becomes clogged, and the air volume decreases as shown in b in Fig. 2. The unit is heating up.

Therefore, every time the power is turned on, the controller 6 measures the elapsed time and applies an alternating current signal to the filter (which is structured to apply vibration to the filter) at a certain time, thereby removing dust attached to the outside of the filter. At this time, the valves 2 in Figure 2 and b in Figure 2, which were the exhaust ports, are under negative pressure and are attracted to the wall of the system, and dust enters through these exhaust ports, causing damage to the optical components inside the device. Another way to get dirty is a system that detects filter clogging by increasing the temperature of the magneto-optical disk device. If the filter becomes clogged after long-term use and the amount of air sent by the cooling fan decreases, it will not be able to keep up with the amount of heat generated by the magneto-optical disk device, and the temperature of the device will rise. This temperature rise occurs on the equipment side. When it is determined that the specified level has been reached, the disk stored inside is controlled to be ejected from the machine for protection. In this embodiment, this disk ejection signal is detected, and the fan rotation is reversed for a certain period of time, vibrating the filter, removing dust attached to the filter, and restoring the cooling effect. The idea is to do so. Alternatively, the determination may be made based on the detection result of the temperature sensor instead of the discharge signal.

[Effects of the Invention] As explained above, by reversing the direction of the fan with a filter as needed, as in the present invention, the filter effect can be expected without clogging the filter with dust. Furthermore, it has the effect of reducing the cost of filter replacement and making it possible to construct a maintenance-free device.

[Brief explanation of drawings]

FIG. 1 shows a magneto-optical disk device of the present invention. FIG. 2 is an explanatory diagram showing the operation of the present invention. l...filter 2... Vibrator 3...Fan 4...Power supply 5... Magneto-optical disk device 6... Controller 7...Partition plate 8...Implementation system 9...Exhaust valve 10...Intake valve Cafu CC) (death)

Claims (1)

[Claims] 1. A cooling device that cools a heating element by blowing air to the heating element, comprising: a rotating sliding type fan for blowing air; and air sent to the heating element by the fan. A cooling device comprising a filter for filtering dust, etc. inside, and a control means for controlling the fan, wherein the control means rotates the fan in reverse after a predetermined period of time has elapsed after the start of driving the fan. Device. 2. The filter further includes a vibrating means for vibrating the filter;
2. The cooling device according to claim 1, wherein the control means vibrates the filter by the vibration excitation means when the fan rotates in reverse. 3. An optical information recording and reproducing device that records and/or reproduces information using an optical head equipped with a plurality of optical components on a record carrier that is moved in a predetermined manner by a drive body, including the drive body. a rotating and sliding type fan that blows air outside the device to the heat source in order to cool the heat source of the device; and a filter that filters dust, etc. in the air blown to the heat source by the fan. and a control means for controlling the fan, wherein the control means reversely rotates the fan after a predetermined period of time has elapsed after the start of driving the fan. 4. The filter further includes a vibrating means for vibrating the filter;
4. The optical information recording and reproducing apparatus according to claim 3, wherein said control means vibrates said filter by said vibration excitation means when said fan rotates in reverse.