JP2011000512A - Dust collector and projection type image display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems that though a mountain fold constitution as a constitution for extending the effective time of dust collection by an electrostatic filter has been proposed, a folding angle of the filter becomes smaller, and suctioned dust cannot be taken out to be thrown away after use, by which a unit price plus a running cost have been large.SOLUTION: A belt-like dust-collecting filter 109 is housed in a small-sized chassis 101. An intake system 103 is provided on a device body 100. In a rectangular frame body of the small-sized chassis 101, a plurality of beams 110 and a plurality of parallel support shafts 108a-108r which are detachable are provided on the facing wall surfaces 113, 114. The dust-collecting filter 109 is provided in a mountain fold between the beams 110 and the support shafts 108a-108r.

Description

  The present invention relates to a dust collector equipped with a filter having a high dust capturing performance, easy cleaning, and low cost in a projection type image display apparatus having a dust removing function.

  A conventional projection type image display device condenses intense light from a light source on an image display device such as a liquid crystal panel or DMD (digital mirror device), modulates this light in accordance with an image signal, and controls the light on the image display element. A large screen is obtained by enlarging and projecting an image.

  Here, the image display device, the light source, and the device power source that are exposed to strong light generate a large amount of heat, and they are thermally destroyed unless they are properly cooled. Therefore, the projection type image display apparatus has a configuration in which outside air is introduced into the apparatus by a fan and the inside of the apparatus is cooled.

  However, according to this configuration, there is a problem that the dust is guided from the outside of the apparatus together with the outside air, and it adheres to the periphery of the image display apparatus or the light source, thereby causing a decrease in brightness and a color unevenness. For this reason, a configuration in which a dust-preventing filter is arranged at the intake port is common, but in this case, it is necessary to clean the filter every several hundred hours in a normal environment. Furthermore, since an electrostatic filter capable of collecting smaller dust is clogged quickly, a new one needs to be replaced every several hundred hours.

  In recent years, a dust collector having a configuration in which a filter area is increased by extending the filter life by providing an electrostatic filter folded in a mountain shape as a countermeasure is provided.

  This dust collector for an electrostatic filter having a mountain-shaped folding configuration is more effective as the mountain is higher, but the cost is increased by increasing the filter area. In addition, since the filter folding angle is small, the sucked dust cannot be removed and the filter becomes disposable, and the maintenance cost increases along with the unit price.

  Accordingly, there is a need for a dust collector that captures even fine dust using an electrostatic filter and can be easily cleaned even in a mountain fold configuration. In view of this situation, the following configuration has been proposed.

  The invention described in Patent Document 1 has a configuration in which a filter folded in a mountain shape is placed on a frame body having a convex portion formed in accordance with the peak of the filter, and the end of the filter is fixed with a hook or the like. The device described in Patent Document 2 is configured such that a guide rod that is passed to the opening of the frame is attached so as to be able to rotate or move in the intake direction, and the filter with the end fixed is biased.

JP-A-11-351657 Japanese Utility Model Publication No. 7-34920

  However, in the invention described in Patent Document 1, it can be used when the mountain fold is shallow, but as described above, when the angle is woven small, the sucked dust cannot be removed, and the filter and the holding portion have a crest. There is a problem that it is difficult to fit or the fixed portion cannot be configured in the case of a small size. In the device described in Patent Document 2, when the filter is attached, the guide rod escapes so as not to apply a load to the filter. However, since it always exists on the filter, the cleaning workability is poor. In particular, in the case of a projection-type image display device, the problem is significant because the size is small and the period between mountains is small.

  In view of the above problems, it is an object of the present invention to provide a dust collector that can be easily cleaned while using an electrostatic filter with high dust collection performance, and a projection image display apparatus including the dust collector.

  A dust collector according to the present invention includes a belt-shaped dust collection filter made of a chemical fiber, a housing on which the dust collection filter is detachably mounted, and a device main body provided with an intake device. Is configured to be detachable from the apparatus main body so that the intake air from the intake apparatus passes through the dust collection filter surface.

  Further, the casing is a rectangular frame, and a plurality of beams provided in parallel between opposing wall surfaces of the frame, and a position between the plurality of beams and parallel to a position shifted toward the intake device side. The plurality of support shafts are provided, and the plurality of support shafts are detachably provided between the wall surfaces.

  Further, the plurality of support shafts are inserted into holes provided on one wall surface of the frame body, and are fixed to the holes provided on the other wall surface in a detachable manner.

  Further, the dust collection filter is held in a bellows shape between the plurality of beams and the plurality of shafts, and a convex portion is provided on the opposing wall surface of the frame so as to follow the shape of the dust collection filter on the intake device side. It is characterized by.

  Further, the case is characterized in that the end of the dust collecting filter can be fixed.

  The dust collection filter is an electrostatic filter.

  Furthermore, a projection type image display apparatus according to the present invention includes a housing having at least an air inlet and an air outlet, a dust collecting unit, a blower unit, a light source unit, an image forming unit, a projection optical system, and a video signal circuit. And a power source, wherein the dust collecting unit is the dust collecting device according to claim 2.

  According to the dust collector of the present invention and the projection display device including the dust collector, cleaning becomes easy while using an electrostatic filter having high dust collection performance.

Air Cleaner overall configuration diagram Small housing exploded view Detailed view of support shaft Small housing configuration diagram Small casing cross section Small housing configuration diagram Projection-type image display device configuration diagram

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a dust collector and an image display device according to the present invention will be described with reference to FIGS.

(Embodiment 1)
The whole block diagram of the air cleaner by 1st embodiment is shown in FIG. A dust collector 100 includes a small casing 101 that captures dust, a photocatalytic apparatus 102 that decomposes odor components such as dust, an axial fan 103 as an intake apparatus, an intake port 104, and an exhaust port 105. 106.

  The small casing 101 is detachably held on the cleaner casing 106. An exploded view of the small housing 101 is shown in FIG. The small casing 101 includes a frame body 107, support shafts 108a, 108b,..., 108r, and a dust collection filter 109. The frame 107 has a plurality of beams 110 extending between four wall surfaces as shown in FIG. The wall surface 111 of the frame body 107 is provided with a plurality of holes 112 at a position between the plurality of beams 110 and shifted to the axial flow fan 103 side. Similarly, a plurality of holes 114 are provided in the wall surface 113, and the diameter of the holes 114 is set smaller than that of the holes 112. The diameters of the support shafts 108a to 108r are set so as to enter the hole 112, and as shown in FIG. 3, the diameter of the constricted portion of the tip is smaller than the diameter of the portion into which the filter is wound. Further, a claw portion 115 is provided at the tip portion. Further, the dust collection filter 109 has a slightly narrower width than the interval between the wall surface 111 and the wall surface 113 for convenience of use.

  The end of the dust collection filter 109 is fixed to the inside of the side wall of the frame body 107 by bonding or some other method. The dust collection filter 109 winds one beam from the fixed end and then winds the support shaft 108a inserted into the hole 112 and the hole 114. Then, after the next beam is wound, the inserted support shaft 108b is wound. Further, similarly, the next beam and the support shaft are rolled up. After repeating in this manner, the other end of the dust collection filter 109 is fixed so as to be removable, and finally includes a dust collection filter 109 as shown in FIG. In this manner, the dust collection filter 109 can be provided in a pleated shape between the beam and the support shaft as shown in FIG. At the same time, as shown in FIG. 6, convex portions 117 and 118 are provided on the intake fan side of the dust collection filter 109 so as to follow the outer shape when the filter 109 is provided in a pleat shape on the inner surface of the wall surface 111 and the wall surface 113. (117 is not visible in FIG. 6), and the structure is such that no gap is formed between the dust collection filter 109 and the wall surface 111 and the wall surface 113.

  As a result, the outside air sucked in can pass through the opening of the dust collection filter 109 and can use a large area, so that the dust collection ability can be maintained for a long time.

  With this configuration, not only the dust collection performance is realized, but also when the dust collection filter loses air permeability due to the adhesion of dust, if the support shafts 108a to 108r are pulled out, the dust collection filter becomes a belt shape again. By returning, it becomes possible to clean easily, and after cleaning, the support shafts 108a to 108r and the dust collecting filter 109 can be returned and used again.

(Embodiment 2)
FIG. 7 shows an overall configuration diagram of a projection type image display apparatus 200 according to the second embodiment. Since the present invention is not a proposal for an optical configuration, it will be briefly described below. The light emitted from the light source 201 is emitted forward by the reflecting mirror 202. Incident light to the optical unit 203 is separated into red, green, and blue color light through dichroic mirrors 204 and 205 and total reflection mirrors 206, 207, and 208, and then incident-side polarizing plates 209R, 209G, and 209B, and a liquid crystal panel 210R. , 210G, 210B and the output side polarizing plates 211R, 211G, 211B, the intensity is modulated by an external input signal not shown. These lights are combined on one optical path by a combining prism 213 provided with dichroic reflecting films 212R and 212B, and are incident on a projection lens 214. The projection lens 214 is designed and installed so that the images on the liquid crystal panels 210R, 210G, and 210B can be enlarged and projected onto a screen (not shown) arranged in front of the apparatus. For this image display, light from the light source 201 needs to be absorbed by the incident-side and emission-side polarizing plates for black display, and thus high temperatures are emitted. On the other hand, since these polarizing plates are mainly made of an organic material, they are deteriorated unless cooled to an appropriate temperature, resulting in an uncontrollable image and being unusable. In addition to this, the light source tube and peripheral mechanical parts that emit 1000 degrees at the time of light emission and the power source 216 for light source and image display are also self-heating and require cooling means in order to ensure reliability. It becomes.

  Therefore, in the present embodiment, outside air (air having a relatively low temperature) passes through the air inlet 219 provided on the side surface of the housing 218 and the dust trapping portion 220 by the air intake fan 217 serving as the air blowing portion. Led. The air pushed in by the intake fan 217 is guided to the optical unit duct 221 arranged in close contact with the fan outlet. The optical unit duct 221 includes a blue opening 222B, a green opening 222G, and a red opening 222R at positions corresponding to the lower portions of the incident side polarizing plate, the liquid crystal panel, and the outgoing side polarizing plate. The air blown out from these openings takes heat from the incident side polarizing plate, the liquid crystal panel, and the outgoing side polarizing plate, and then draws heat from the light source 201 and its peripheral mechanism parts and the power source 216 in the process of being drawn by the exhaust fan 223. Also take away. Air reaching the exhaust fan 223 is blown out through an exhaust port 224 provided on the side surface of the housing 218. Conventionally, external dust is sucked in along with the outside air during the cooling process, and the dust adheres to the periphery of the liquid crystal panel and the light source, causing premature deterioration of brightness, or causing uneven color in the projected image. It was happening. Therefore, in this embodiment, a housing structure and a dust capturing structure that do not allow dust to enter are introduced. In the case structure, the projection lens is also completely accommodated in the case, and the window member 225 is pasted on the case without any gap in the light transmission part. Cushioning materials 227, 228, and 229 that do not allow air to pass are provided between the air inlet 219 and the dust catcher 220, between the dust catcher 220 and the air intake duct 226, and between the air outlet 224 and the exhaust fan 223. Can be controlled. Next, the dust trapping structure will be described.

  The dust promoting structure has the same configuration as that of the first embodiment. The dust catcher 220 is detachably held. The configuration diagram of the dust catcher 220 is the same as that in FIG. The dust catcher 220 includes a frame body 107, support shafts 108 a to 108 r, and a dust collection filter 109. The frame 107 has a plurality of beams 110 extending between four wall surfaces as shown in FIG. A plurality of holes 112 are provided in the wall surface 111 and a plurality of holes 114 are provided in the wall surface 113 at positions shifted in a direction in which air is moved by the intake fan in the dust collector 100 between the beams 107. The diameter is also set small. Further, the support shafts 108a to 108r are provided with at least two portions having different diameters so as to enter the holes 112 and 114, and a claw portion 115 at the tip is provided as shown in FIG. Further, the dust collection filter 109 has a slightly narrow width with respect to the interval between the wall surface 111 and the wall surface 113.

  The end of the dust collection filter 109 is fixed to the inside of the side wall of the frame body 107. The dust collection filter 109 winds one beam from the fixed end, winds the inserted 108a, winds the next beam, winds the similarly inserted 108b, and winds the next beam. This operation is repeated, and finally, the other end of the dust collection filter 109 is fixed so as to be detachable and includes the dust collection filter 109 as shown in FIG. That is, as shown in FIG. 5 showing a cross section, the dust collecting filter 109 can be provided in a pleated shape between the beam and the shaft. At the same time, convex portions 117 and 118 are provided on the leeward side (intake fan 217 side) of the intake air of the dust collection filter 109 so as to follow the outer shape when the dust collection filter 109 is provided in a pleat shape inside the wall surface 111 and the wall surface 113. Therefore, a gap is not formed between the dust collection filter 109 and the wall surface 111 and the wall surface 113.

  As a result, the outside air sucked by the intake fan 217 passes through the opening of the dust collection filter 109 and can use a large area, so that the dust collection ability can be maintained for a long time. Further, when the dust collection filter loses air permeability due to dust adhesion, if the support shafts 108a to 108r are removed, the dust collection filter can be easily cleaned by returning to the belt shape again, and is supported again after cleaning. The shafts 108a to 108r and the dust collection filter 109 can be returned and used.

  The projection type image display device using the dust device of the present invention can maintain the performance of collecting the dust of outside air sucked in for cooling over a long period of time. Side polarizing plates 209R, 209G, and 209B, liquid crystal panels 210R, 210G, and 210B, emission side polarizing plates 211R, 211G, and 211B) and light source portions (light source 201, reflecting mirror 202) and color unevenness and luminance reduction that occur. It can be suppressed. In particular, when the same amount of outside air is sucked in, the opening area increases, so that the wind speed decreases and the dust collection capability can be increased. In addition, it is desirable to make the height of the mountain fold pleats as high as possible. Further, in the configuration of the present invention, the contact area between the support shafts 108a to 108r and the filter is relatively large. It is desirable to reduce the contact area with the filter by providing grooves 108a to 108r on the circumference.

  When the air permeability deteriorates due to dust adhering to the filter after a long period of use and the inside of the apparatus cannot be sufficiently cooled, the dust trapping part 220 is removed from the apparatus main body, and the filter is filtered as described above. If the filter is expanded and cleaned, the air permeability of the filter will be improved, and it will be possible to restore the performance by reassembling it.

  At this time, since no cost is required, inexpensive maintenance management becomes possible.

  In the present invention, the support shaft is fixed by passing through two holes, but it can be replaced if it is a rod-like or linear part that can be attached and detached individually, and is not fixed to the wall with a linear spring material. It is also possible to substitute by hooking and fixing.

  INDUSTRIAL APPLICABILITY The present invention is useful for a dust collector and a projection type image display apparatus using the dust collector because it can provide a filter with high dust capturing performance, easy cleaning and low cost.

DESCRIPTION OF SYMBOLS 100 Dust collector 101 Small housing | casing 102 Photocatalyst device 103 Axial fan 104 Intake port 105 Exhaust port 106 Purifier housing 107 Frame 108a-108r Support shaft 109 Dust collection filter 110 Beam 111, 113 Wall surface 112, 114 Hole 115 Support Claw portion 117, 118 convex portion 200 Projection type image display device 201 Light source 202 Reflecting mirror 203 Optical unit 204, 205 Dichroic mirror 206, 207, 208 Total reflection mirror 209R, 209G, 209B Incident side polarizing plate 210R, 210G , 210B Liquid crystal panels 211R, 211G, 211B Emission-side polarizing plates 212R, 212B Dichroic reflection film 213 Synthetic prism 214 Projection lens 216 Power supply 217 Intake fan 218 Housing 219 Intake port 220 Dust trap 221 Optical unit duct 222B Opening for blue 222G Opening for green 222R Opening for red 223 Exhaust fan 224 Exhaust port 225 Window member 226 Intake duct 227,228,229 Buffer material

Claims (7)

A belt-shaped dust collection filter made of chemical fiber, a housing on which the dust collection filter is detachably mounted, and an apparatus body provided with an intake device,
The dust collector, wherein the housing is configured to be detachable from the apparatus main body so that intake air from the intake apparatus passes through the dust collection filter surface. The casing is a rectangular frame, and includes a plurality of beams provided in parallel between opposing wall surfaces of the frame, and is provided in parallel between the plurality of beams and at a position shifted toward the intake device side. The dust collecting device according to claim 1, further comprising a plurality of support shafts, wherein the plurality of support shafts are detachable between the wall surfaces. The dust collector according to claim 2, wherein the plurality of support shafts are inserted into holes provided in one wall surface of the frame and are detachably fixed to holes provided in the other wall surface. The dust collection filter is held in a bellows shape between the plurality of beams and the plurality of shafts, and a convex portion is provided on the opposing wall surface of the frame so as to follow the shape of the dust collection filter on the intake device side. The dust collector according to claim 2. The dust collector according to claim 2, wherein the casing can fix an end of the dust collecting filter. The dust collecting apparatus according to claim 2, wherein the dust collecting filter is an electrostatic filter. Projection-type image display device comprising a housing having at least an air inlet and an air outlet, a dust collector, a blower, a light source, an image forming unit, a projection optical system, a video signal circuit, and a power source And the said dust collection part is a dust collector of Claim 2, The projection type image display apparatus characterized by the above-mentioned.