JPH0419892A - Dust removing device - Google Patents

Abstract

PURPOSE:To secure the irreducible minimum passing quantity of air even when a filter member is clogged by dust by providing an air circulation dust on the peripheral wall of an air circulating path between a cooling fan and the filter member, and communicating this duct to the inside or outside of a cooling object device. CONSTITUTION:In the process of using a drive device 4, the dust in air sucked by a cooling fan 14 is stuck to a filter member 16, and the air transmissivity of the filter is lowered. In this process, the temperature is gradually increased from the inside temperature in the case of starting the use of the drive device. With advancement for the dirt of the filter member 16, the quantity of the air current passing through the filter member 16 is extremely lowered and the passing cross section of an air circulating path 15a itself, however, is secured by an air circulation duct 17 at an irreducible minimum. Thus, the inside temperature of the drive device 4 can be prevented from reaching the limit inside temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dust removal device mainly installed in an optical disk information recording/reproducing device or the like.

[Conventional technology]

In the above-mentioned information recording and reproducing apparatus, means for rotating the optical disk, an electric circuit board for controlling the optical head, etc.
Is it placed inside the device image and controlled? In the IIl process, the internal air is heated by 7 degrees due to heat generation. For this reason, there is a risk that the loaded optical disk and peripheral mechanisms will be heated to a temperature higher than the permissible limit and be thermally damaged. Therefore, cooling air is circulated inside the device image to keep the internal temperature low. However, if the introduced external air contains dust, it may damage the lens surface of the optical system used. The above-mentioned dust may adhere and cause accidents such as interfering with recording and reproduction. For this reason, means such as a fan that forcibly sends air into the device body are usually equipped with a filter, which traps dust and uses the clean air that passes through it to cool the internal mechanism. I am trying to make sure that this is done.

(Problem to be solved by the invention) However, when removing dust by placing a filter in the air flow path so as to block it, the amount of dust captured by the filter is (If this happens, clogging will occur and the flow resistance will increase. As a result, the amount of air passing through the device body per unit time will decrease, making the original purpose of air cooling insufficient. The temperature may rise above the limit temperature, resulting in thermal damage to the optical disk and peripheral mechanisms.To do this, the condition must be carefully observed and filters replaced frequently. .

[Purpose of the invention]

The present invention was made based on the above circumstances, and even if dust adheres to the filter surface and the air permeability deteriorates,
The present invention aims to provide a dust removal device devised to ensure the required air flow rate and to suppress temperature rise.

[Means to solve the problem]

Therefore, in the present invention, in a dust removal device in which a filter member is disposed in an air flow passage to adsorb and remove dust, the peripheral wall of the air flow passage located between the cooling fan and the filter member is An air circulation duct is provided, and the air circulation duct is communicated with the outside or inside of the device to be cooled.

[Effect]

Therefore, even if the filter member becomes clogged in the process of removing dust by the filter member,
In this case, the negative pressure (or positive pressure) generated between the filter member and the cooling fan is used to circulate air from the outside (or into the inside) through an air distribution duct provided on the peripheral wall of the air flow passage. The required air flow rate can be secured, the temperature inside the target device will not rise beyond the allowable limit, and the product seal of optical discs, peripheral mechanisms, etc. will not be compressed, and it can be used for a long time. be able to.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In the figure, the symbol is a drive case that protects and houses the optical disk drive device 4, power supply 13, cooling fan 14, etc. It is located on the opposite side to the side where the cooling fan 14 is installed, and the cartridge is inserted. mouth 2,
Cooling air outlet ports 3 are each opened.

In the drive device 4, the cartridge insertion slot 2 is provided.
A spindle morph 7 rotates the optical disk cartridge 6 loaded in the drive device 4 via the drive device 4, and a drive device 9 moves the optical head 8 in correspondence with the cartridge 6. An electric board 5 for drive control of the drive device 4 is disposed in a cooling air passage area.

The cooling fan 14 is disposed facing the air inlet 14a of the drive case 1, and a dust removal device 15 according to the present invention is disposed inside the drive case 1 on the outlet side of the cooling fan 14. It is set up. The dust removal device has a cylindrical configuration between the cooling fan 14 and a zigzag-shaped filter member 16 provided across the air flow path 15a on the peripheral wall 15b of the air flow path 15a. The drive case 1, which is a device to be cooled, is mounted on the peripheral wall 15b.
It constitutes an air circulation duct 17 that communicates with the inside.

In addition, in the figure, numeral 11 is a power cable, 10 is a head cable, and 12 is a board cable.

In such a configuration, dust in the air sucked in by the cooling fan 14 during use of the drive device 4 adheres to the filter member 16, and its air permeability decreases (FIG. 3 fa). (replaced from Figure 3 fb)). In this process, as shown in FIG. 4, the internal temperature To of the drive device is gradually increased from the time when the drive device is started to be used. As the filter member 16 becomes more and more contaminated, the flow rate of air passing through the filter member 16 decreases significantly, but the cross-sectional area of the air flow passage 15a itself is ensured at least by the air flow duct 17. As shown in A of Fig. 4, the temperature rises to a temperature (T1) slightly lower than the limit internal temperature (T, ), reaching the saturation temperature, the temperature increase stops, and the inside of the drive device 4 reaches the limit internal temperature (T2). can be prevented from reaching.

In the above embodiment, since the filter member 16 is disposed on the outlet side of the cooling fan 14, the pressure inside the air flow passage 15a is positive, so the air flow duct 17 is communicated with the inside of the drive case l. However, the filter member 16
is arranged on the inlet side of the cooling fan 14, and the air flow passage 15 between the filter member 16 and the cooling fan 14
When an air circulation duct is provided on the peripheral wall of the drive case 1, the air circulation duct is preferably opened and communicated with the outside of the drive case 1 because the air flow passage 15a is under negative pressure.

〔Effect of the invention〕

The present invention has been described in detail above, and by providing an air circulation duct on the peripheral wall of the air circulation passage between the cooling fan and the filter member and communicating this with the inside or outside of the device to be cooled, even if Even if the filter member becomes clogged with dust, the minimum amount of air circulation can be ensured by the air circulation duct, so the temperature of the equipment to be cooled will not rise above the limit temperature, and it can be used safely. In addition, since the filter can be replaced as needed, there is no need to worry about managing it.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing one embodiment of the present invention, Fig. 2 is an external perspective view, Figs. 3 (a) and (b) are sectional views of how it is used, and Fig. 4 shows temperature changes inside the machine. It is a graph. 4... Drive device, 14... Cooling fan, 15.
...Dust removal device, 15a... Air flow path, 15b.
... Peripheral wall, 16... Filter member, 17... Air distribution duct.

Claims (1)

[Claims] A filter member is installed in the air flow path to attract dust,
In the dust removal device designed to remove dust, an air circulation duct is provided on the peripheral wall of the air flow passage located between the cooling fan and the filter member, and the air circulation duct is communicated with the outside or inside of the device to be cooled. A dust removal device characterized by: