JPH0421990A - Dust removing device - Google Patents

Abstract

PURPOSE:To prevent the temperature of an objective device from being increased higher than a critical temperature even when a filter member is clogged by providing a bypass path in an air circulating path between a cooling fan and the filter member and installing a stop valve in this bypass path. CONSTITUTION:On the outside of a drive case 1, an air circulating path 15a of a dust removing device 15 is positioned and on the upstream side, a filter member 16 is arranged. Then, a bypass path 17 is opened to a peripheral wall 15b surrounding the path 15a, and in the path 17, a stop valve 18 is provided to be communicated to the outside of the case 1 and to be closed elastically to the outside. Thus, in the process of using a drive device 4, dust in air sucked by the cooling fan 14 is stuck to the filter member 16, and the transmissivity of air is lowered. In this process, along with the dirt of the filter member 16, the flow of the air transmitted through the member 16 is extremely lowered and since the inner pressure of the circulating path 15a positioned between the member 16 and the fan 14 increases the value of negative pressure, however, the stop valve 18 is sucked to the inside. Then, the path 17 is opened and the irreducibly minimum flow of air can be secured at least.

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.

(Prior Art) In a series of information recording and reproducing devices, a means for rotating an optical disk, an electric circuit board for controlling an optical head, etc. are arranged inside the device body, and during the control process, heat generated inside the device causes damage to the inside. heat up the air. 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 W-mounted body to keep the internal temperature low. However, if the introduced external air contains dust, the surface of the lens of the optical system used may be damaged. The above-mentioned dust may adhere to the disc, causing accidents such as interfering with recording and playback. For this reason, means such as a fan that forcibly sends air into the device body are usually equipped with a filter.
The filter traps dust, and the clean air that passes through it cools the internal mechanisms.

(Problem to be Solved by the Invention) However, when removing dust by arranging the filter in the air flow path so as to block it, the amount of dust captured by the filter is When the amount increases, clogging occurs and flow resistance increases. As a result, the amount of air passing through the device panel per unit time decreases, making the original purpose of air cooling insufficient and causing the temperature to rise beyond the permissible limit, causing optical disks and peripheral components to resulting in thermal damage. To do this, you need to carefully monitor the condition and replace filters frequently.

(Object 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 a required air flow rate and suppress temperature rise.

(Means for Solving the Problems) Therefore, in the present invention, in a dust removal device in which a filter member is disposed in an air flow path to adsorb and remove dust, the cooling fan and the filter member are connected to each other. A bypass passage that communicates with the outside or inside of the device to be cooled is provided in the air flow passage located between, and the bypass passage is provided with an on-off valve that opens when the internal pressure of the air flow passage or the set temperature in the device to be cooled is exceeded. It is installed.

(Function) Therefore, even if the filter member becomes clogged during the process of removing dust by the filter member, in this case, the negative pressure ( Or, when the temperature inside the equipment to be cooled exceeds the set temperature, the on-off valve opens to obtain air flow through the bypass passage, and the temperature inside the equipment to be cooled exceeds the permissible limit. It does not heat up and can be used for a long time without shortening the product life of optical discs, peripheral mechanisms, etc.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to the drawings. In the figure, reference numeral 1 indicates an optical disk drive device (as a device to be cooled) 4, a power supply 13, and a cooling fan 14.
It is a drive case that protects and houses the above-mentioned cooling fan 14, and is located on the opposite side to the side where the cooling fan 14 is installed.
A cartridge insertion port 2 and a cooling air discharge port 3 are each opened.

In the drive device 4, the cartridge insertion slot 2 is provided.
A spindle motor 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 circuit board 5 for drive control of the drive device 4 is disposed in a cooling air passage area.

The cooling fan 14 is disposed on the air inlet 14a side of the drive case 1, and the air flow passage 15a of the dust removal device 15 is located on the outside thereof, and the filter member 16 is disposed upstream thereof. There is.

In particular, in this embodiment, the bypass passage 17 is open to the peripheral wall 15b surrounding the airflow passage 15a, communicates with the outside of the drive case 1, and is elastically moved outward by a spring or the like. Closed on-off valve 18
is provided in the bypass passage 17.

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, while the drive device 4 is being used, dust in the air sucked in by the cooling fan 14 adheres to the filter member 16, resulting in a decrease in air permeability. In this process, as shown in FIG. 4, the internal temperature of the drive device is gradually increased from the internal temperature T0 at the beginning of use. As the filter member 16 becomes more contaminated, the flow rate of air passing through the filter member 16 decreases significantly, but the internal pressure of the air flow passage located between the filter member 16 and the cooling fan 14 increases in negative pressure value. Therefore, as a result, the on-off valve 18 is sucked inward, the bypass passage 17 is opened, and at least the minimum air flow rate can be secured, which is lower than the critical internal temperature (T2) as shown in A in Fig. 4. When the temperature rises to 'r+), the saturation temperature is reached, the temperature rise stops, and the inside of the drive device 4 can be prevented from reaching the limit internal temperature (T2).

In this embodiment, the on-off valve 18 is connected to the air flow passage 15a.
For example, as shown in FIG. 3, the drive was set so that the internal temperature of the drive unit W4 was saturated at a temperature (T, ) lower than the limit internal temperature. The opening/closing control may be controlled by the control system 20 according to measurement by a temperature sensor 19 provided in the device 4.

Although not shown, in a configuration in which a cooling fan is installed on the upstream side of the air flow passage 15a and a filter member is installed on the downstream side, the bypass passage provided in the air flow passage 15a may be replaced by a driver case or the like. When the internal pressure of the airflow passage increases due to the action of the cooling fan, the on-off valve connected to the inside of the device to be cooled and installed in the bypass passage is in the process of clogging of the filter member, and the opening/closing valve is opened by the positive pressure. Alternatively, the set temperature within the drive device 4 may be detected by a sensor as in the above-mentioned embodiment, and the opening may be made.

(Effects of the Invention) The present invention has been described in detail above, and a bypass passage is provided in the airflow passage between the cooling fan and the filter member, and an on-off valve is installed here to prevent the filter member from clogging. (
Since the opening/closing valve is opened, the temperature of the target device, such as an optical information recording/reproducing device, will not rise above the limit temperature, and the device can be used safely.

Further, since the filter can be replaced as needed, there is no need to worry about managing this point. Furthermore, the bypass passage is closed until the filter member is clogged, completely suppressing the intrusion of dust, and therefore contamination by dust is completely prevented until the filter member is clogged.

[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, FIG. 3 is a schematic sectional view of another embodiment, and FIG. 4 is a graph showing changes in temperature inside the machine. 4... Drive device, 14... Cooling fan, 15.
...Dust removal device, 15a... Air flow path, 15b.
... Peripheral wall, 16... Filter member, 17... Bypass passage, 18... On-off valve.

Claims (1)

[Claims] A filter member is installed in the air flow path to attract dust,
In the dust removal device configured to remove dust, an air flow passage located between the cooling fan and the filter member is provided with a bypass passage communicating with the outside or inside of the device to be cooled, and the air flow passage is connected to the bypass passage. A dust removal device characterized by being equipped with an on-off valve that opens when the internal pressure or the set temperature in the device to be cooled is exceeded.