JPH08128400A - Take-up type air filter mechanism - Google Patents

Abstract

PURPOSE: To increase the effective area of an air filter and an amount of filitered air for elongating a usable time by using a roll-like air filter and gradually taking up the filter. CONSTITUTION: An air filter 1 is taken up by a feed reel 2 under the initial condition. When here an apparatus like a liquid crystal projector 7 is electrified, a pulse generator 5 generates pulses every fixed time during the electrification to drive a stepping motor 4. When the drive motor is rotated, a take-up reel 3 connected to the motor 4 is rotated to take up the air filter 1. Further, while a tensioner 6 urges the filter 1 to make intimate contact with a fan 8, it fixes the tension of the filter 1 to smooth the take-up. Thus, while the liquid crystal projector or the like is electrified, the filter 1 moves in front of the air cooling fan 8 of the apparatus by a fixed distance at a fixed time interval so that air can be always filtered through the new portion of the air filter.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention relates to an air filter for electronic equipment such as a liquid crystal projector.

[0002]

2. Description of the Related Art Generally, it is necessary to prevent performance deterioration of electronic equipment due to heat generation, but especially the liquid crystal panel used in the liquid crystal projector is vulnerable to heat, and when used, it continuously blows air with a fan to force air cooling. Need of In this case, if the air in the room is sent directly without passing through the air filter, dust and dirt adhere to the liquid crystal panel, which adversely affects the image. Therefore, the air filter is indispensable for the liquid crystal panel.
By the way, the conventional air filter is simply placed in front of the fan, and the area of the filter itself is limited. Therefore, the air filter is clogged in a short time and needs to be cleaned regularly.

[0003]

The air filter of the conventional liquid crystal projector needs to be frequently and regularly cleaned.

[0004]

According to the present invention, a reel is provided, a roll-shaped air filter is used, and the air filter is wound little by little. This can greatly increase the area of the air filter, and
By winding it up little by little, it is possible to keep the condition without clogging.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing an embodiment of a winding type air filter mechanism according to the present invention. In FIG. 1, 1
Is an air filter, 2 is a delivery reel, 3 is a take-up reel, 4 is a stepping motor for driving the take-up reel 3, 5 is a pulse generator for generating pulses for driving the stepping motor, and 6 is an air filter 1 which will be described later. A tensioner for closely contacting the opening of the air-cooling fan 8, 7 is a liquid crystal projector, and 8 is an air-cooling fan for the liquid crystal projector 7. It should be noted that in FIG. 1, the housing of the wind-up type air filter mechanism itself is omitted in order to make the drawing easy to see.

The air filter 1 is wound around the delivery reel 2 in the initial state. Here, when the device of the liquid crystal projector 7 is turned on, the liquid crystal projector 7 is turned on.
While the power is on, the pulse generator 5 drives the stepping motor 4 by generating pulses at regular intervals.
When the stepping motor 4 rotates, the take-up reel 3 connected to the stepping motor 4 rotates and winds the air filter 1. The tensioner 6 also has a function of bringing the air filter 1 into close contact with the fan 8 and keeping the tension of the air filter 1 constant to smooth the winding.

Thus, while the liquid crystal projector 7 is energized, the air filter 1 moves in front of the air-cooling fan 8 of the apparatus at a constant time interval by a fixed amount, and a new portion of the air filter 1 constantly filters air.

In this embodiment, the air filter 1 is wound only in proportion to the energization time of the device, but the amount of dust around the device or the dirt on the air filter 1 is measured to make the winding speed variable. It is also possible. Also,
In this embodiment, the pulse motor 4 is mounted on the axis of the take-up reel 3.
However, depending on the shape of the device, the arrangement of the take-up reel 3 and the pulse motor 4 may be changed to perform power transmission by gears or belts. Furthermore, the moving direction of the air filter 1 is not limited to left and right, but up and down. It is also possible to carry out etc. Further, usually, the air filter 1 is constructed in a cassette type and is detachably mounted.

[0009]

According to the present invention, since a long air filter wound in a roll shape is used, the effective area of the air filter can be increased, the air filtration amount can be increased, and the usable time can be lengthened. . Therefore, the interval for cleaning and replacing the air filter can be made longer than in the conventional case.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 Air Filter 2 Delivery Reel 3 Take-up Reel 4 Stepping Motor 5 Pulse Generator 6 Tensioner 7 Liquid Crystal Projector 8 Fan

Claims (1)

[Claims] 1. An air filter mechanism of an electronic device, a delivery reel, a take-up reel, a roll-shaped air filter having one end locked to the delivery reel and the other end locked to the take-up reel, and a take-up reel. An air filter unit that is composed of a stepping motor that winds and rotates the reel and a pulse generator that generates a pulse that drives the stepping motor at constant time intervals while the electronic device is energized, and is located between the feed reel and the take-up reel. Is a wind-up type air filter mechanism, which is arranged in front of the air-cooling intake port.