JP2012066178A - Dust collector, and projection type display device with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a pleated static filter (folded in zigzag) is used for keeping a dust collection performance at a high level for a long period of time, but the filter is disposable since there is no way to clean the filter.SOLUTION: A dust collector includes: a rectangular static filter 105; and a filter frame 106 configured to enclose the static filter 105 at edge parts in the short-side direction, or to be fixed to the surface of the filter and support the filter, and having easy-to-bend portions and difficult-to-bend portions at intervals in the longitudinal direction of the static filter 105. The dust collector is characterized in that when the filter frame 106 is bent, bent portions are formed alternately in opposite directions. This allows the filter to have a pleated shape when in use, and meanwhile, to spread out to be cleaned or washed in cleaning, thus achieving reusable.

Description

  The present invention relates to a dust collector using an electrostatic filter and a projection-type image display device including the dust collector, and in particular, a pleated filter (shaped bent into a bellows) for making a reusable electrostatic filter large in opening. It is related with the provided apparatus.

  2. Description of the Related Art Conventionally, a projection type image display apparatus condenses intense light from a light source on an image display element such as a liquid crystal panel or a digital mirror device (DMD), modulates this light in accordance with an image signal, and 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, dust is introduced from the outside of the apparatus together with the outside air, and it adheres to the periphery of the image display device and the light source, thereby causing a decrease in brightness and 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, the filter must be cleaned every several hundred hours in a general environment. In particular, an electrostatic filter capable of collecting fine dust is clogged quickly, so that a new one needs to be replaced every shorter time.

  In recent years, an apparatus having a structure in which the filter area is increased by extending the electrostatic filter by folding the electrostatic filter into a mountain shape has been provided.

Japanese Patent Laid-Open No. 5-23522 Japanese Patent No. 4448990

  However, the effect of the electrostatic filter mountain fold device increases as the mountain height increases, but the cost increases due to the increase in the filter area. In addition, since the filter folding angle becomes small at that time, the sucked dust cannot be removed and it becomes disposable, which increases the maintenance cost.

  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 mountain-folded filter is sandwiched and fixed by a guide plate having a convex portion formed in accordance with the mountain of the filter. The invention described in Patent Document 2 is a configuration in which a pleated filter is further folded in a zigzag manner, and a sheet provided with a notch corresponding to the folded portion is adhered to the top and bottom of the filter, thereby biasing the filter It is.

  However, although the invention described in Patent Document 1 can be used when the mountain fold is shallow, if the angle is woven small as in this proposal, the peaks of the filter and the holding portion do not match. In addition, there is a problem that the filter is limited to a material that is slippery with respect to the guide plate. In the case of the invention described in Patent Document 2, there is no problem once the shape is formed, but there is a possibility of breaking at the cut portion in the application where a load is applied and used repeatedly.

  A dust collector for solving the above-described problems includes a rectangular filter and a part that is included in or fixed to a short side end of the filter, and a part that is easily bent and a part that is difficult to be bent periodically in the longitudinal direction of the filter. And the filter frame is formed in a pleated shape by bending an easily bent portion of the filter frame.

  Further, the pleated filter and the filter frame can be stored, and a storage housing having an opening at a portion corresponding to the ventilation portion of the filter is provided.

  Further, the filter frame is made of a resin material, and is formed by insert molding so as to include an end portion in a short side direction of the filter at the time of injection molding.

  Further, the filter frame is made of a resin material, and the end portion in the short side direction of the filter is fixed by welding.

  The filter is a material that can be regenerated by washing.

  Furthermore, a projection display device for solving the above problems includes a light source, an illumination device that guides light from the light source device, and an image display element that modulates incident light according to a video signal when the illumination light is incident. A projection lens for projecting light modulated by the image display element onto a screen, a circuit unit for driving the light source, a video processing circuit for driving the image display element in response to an input signal, and the circuit unit A power supply unit that supplies power to the vehicle, an intake device that takes in outside air from the outside, and a housing that contains these, and any one of the dust collectors is provided between the intake device and the housing. is there.

  A light source, an illuminating device that guides light from the light source device, an image display element that receives the illumination light and modulates incident light in accordance with a video signal, and light modulated by the image display element on a screen A projection lens for projecting, a circuit unit for driving the light source, a video processing circuit for driving the image display element in response to an input signal, a power source unit for supplying power to the circuit unit, and intake air for taking in outside air from the outside It is possible to configure a projection type display device comprising an apparatus and a housing containing them, and the dust collecting device described above is provided between the intake device and the housing.

  According to the above configuration, the electrostatic filter is supported on the pleat type so that the surface area of the electrostatic filter can be increased and the dust collection ability can be enhanced over a long period of time, and the filter is expanded to a substantially planar state. By supporting it as possible, it is possible to provide a dust collector that can efficiently clean up the captured dust. This is particularly effective for filters that can be cleaned or washed. Furthermore, if this dust collector is used as a dust collector of a projection type image display device, cleaning work is not necessary for a long time, and it becomes possible to use a filter repeatedly, thereby reducing maintenance costs. It becomes possible.

Configuration diagram of the air cleaner in the first embodiment The perspective view of the filter unit in Embodiment 1 The perspective view of the filter in Embodiment 1 Sectional drawing of the filter unit in Embodiment 1 Development view of filter frame in embodiment 1 The perspective view of the filter structure 2nd plan in Embodiment 1 Sectional drawing of the 2nd filter unit plan in Embodiment 1 Exploded view of second draft of filter frame in embodiment 1 Configuration diagram showing a projection display apparatus according to Embodiment 2 The block diagram which shows the 2nd plan of the projection type display apparatus in Embodiment 2

(Embodiment 1)
1 is a view showing a cross section of an air cleaner according to Embodiment 1 of the present invention, FIG. 2 is a view showing a filter unit, and FIG. 3 is a view showing a filter structure. The housing 101 includes an air intake portion 102 and an air exhaust portion 103. An axial fan 104 driven by an external power source is provided inside the housing 101, and an electrostatic filter 105 is formed on the air intake side in a pleated form. Filter frames 106 fixed to both ends of the electrostatic filter 105 for maintenance are provided. The electrostatic filter 105 and the filter frame 106 are detachable, and a filter case 107 detachable from the housing 101 is provided.

  According to this, by the rotation of the axial fan 104, the outside air is sucked from the intake portion 102 of the housing 101 and permeated through the pleated electrostatic filter 105, whereby dust in the outside air can be captured. The air from which dust has been removed in this manner can be provided from the exhaust portion 103 of the housing 101 to provide purified air. As described above, the filter area can be increased by forming the electrostatic filter in a pleated form. And it becomes possible to extend the time until clogging with the trapped dust.

  FIG. 2 shows a filter unit in which the filter case 107 includes an electrostatic filter 105 and a filter frame 106. FIG. 3 shows the electrostatic filter 105 and the filter frame 106 extracted therefrom. FIG. 4 is a view when FIG. 2 is cut in the horizontal direction. The filter frame 106 is provided at the upper and lower ends of the electrostatic filter 105.

  Here, when the filter frame 106 is formed, the electrostatic filter 105 is inserted (enclosed) in the filter frame 106 or fixed to the filter frame 106 by welding or the like, and the end in the short side direction of the electrostatic filter 105 is the filter. It is included or fixed to the frame 106. As shown in FIG. 5, the filter frame 106 includes a slit 109 and a thin portion 110, and FIG. 5 shows a state in which the thin portion 110 is linearly extended. The side surface of the filter frame 106 is provided with a convex portion 111 and a concave portion 112, and the position is determined by inserting the convex portion 111 into the concave portion 112 when folded as shown in FIG. If the device is operated from such a characteristic, the dust in the air is continuously captured and the pressure loss increases, the filter unit is taken out, and the electrostatic filter 105 including the filter frame 106 is further taken out from there. By unfolding, even a pleated filter with a large amount of bending can be easily cleaned.

  Particularly in recent years, electrostatic filters that can be washed with water have been proposed. This filter needs to be charged with a stimulus such as light mum after washing with water and drying, but in this embodiment, the filter frame 106 can be deployed so that this washing and recharging can be performed. This electrostatic filter can be used. Further, even after washing and drying, it is possible to easily return to the original storage state by inserting the convex portion 111 into the concave portion 112 and folding it.

  6 and 7 show different structures of the filter frame 106. FIG. The electrostatic filter 105 is fixed to the side surface of the filter frame 106 by adhesion or welding. Also in this configuration, the filter frame 106 is provided with slits 109 and thin portions 110a and 110b as shown in FIG. 7, and FIG. 8 shows a state where the thin portions 110a and 110b are linearly extended. The side surface of the filter frame 106 is provided with a convex portion 113 and a hole portion 114, and the position is determined by inserting the convex portion 113 into the hole portion 114 when folded as shown in FIG.

  Therefore, even with this configuration, the same effect as the above-described configuration can be obtained.

  Thus, according to the first embodiment, an air cleaner that is easy to maintain can be provided.

(Embodiment 2)
FIG. 9 is a diagram showing a structure of a projection type image display apparatus according to Embodiment 2 of the present invention. Since the present invention is not a proposal for an optical configuration, the optical configuration will be briefly described below.

  The light emitted from the light source 115 is emitted forward by the reflecting mirror 116. Incident light to the optical unit 117 is separated into red, green, and blue color light via dichroic mirrors 118 and 119 and total reflection mirrors 120, 121, and 122, and then incident-side polarizing plates 123R, 123G, and 123B, and a liquid crystal panel 124R, 124G, and 124B, and the output side polarizing plates 125R, 125G, and 125B, the intensity is modulated by an external input signal not shown. These lights are combined on one optical path by a combining prism 127 provided with dichroic reflecting films 126R and 126B, and enter 128 onto a projection lens. This projection lens 128 is designed and installed so that the images on the liquid crystal panels 124R, 124G, and 124B can be enlarged and projected onto a screen (not shown) disposed forward through a dust-proof glass 130 attached to the opening of the housing 129. ing.

  In order to display black in this image display, it is necessary to absorb light from the light source 115 by the incident-side and emission-side polarizing plates, so that a high temperature is 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 the above, the device has a light source tube that emits light at 1000 degrees, a peripheral mechanical component, a light source and a power source 131 for image display, and self-heating is large. Necessary.

  In the present embodiment, outside air (air having a relatively low temperature) is passed through an intake port 132, a prefilter 133, and a pleated electrostatic filter 134 provided on the side surface of the housing 129 by an intake fan 156 that is a blower unit. Guide into the set. The air pushed in by the intake fan 156 housed in the intake duct 135 is guided to the optical unit duct 136 arranged in close contact with the outlet of the intake fan 156. In the optical unit duct 136, a blue opening 137B and a green opening 137G are provided at positions corresponding to lower portions of the incident side polarizing plates 123R, 123G, and 123B, the liquid crystal panels 124R, 124G, and 124B, and the outgoing side polarizing plates 125R, 125G, and 125B. , A red opening 137R is provided. The air blown out from these openings takes heat from the incident side polarizing plates 123R, 123G, 123B, the liquid crystal panels 124R, 124G, 124B, and the outgoing side polarizing plates 125R, 125G, 125B, and then is drawn in by the exhaust fan 138. The heat of the light source 115, its peripheral mechanism parts, and the power source 131 is also removed.

  Furthermore, since the light source driving circuit 139 and the video signal circuit 140, which are not shown in the figure, also generate heat, they are designed to be cooled at the same time.

  Air reaching the exhaust fan 138 is blown out through an exhaust port 157 provided in the housing 129.

  In this embodiment, a pre-filter 133 is provided on the intake side of the same filter unit as in the first embodiment. Since the pre-filter 133 needs to have the same life as that of the electrostatic filter 134, it is desirable that the pre-filter 133 be a rough urethane filter or an electrostatic filter that is not easily clogged even if the dust collection effect is deteriorated. As a result, in the case of the same air volume as in the first embodiment, it is possible to measure the life extension. If there is a margin that can make the electrostatic filter 134 large, a similar life can be obtained by enlarging the electrostatic filter 134 (increasing the surface area) without the pre-filter 133.

  The support structure of the electrostatic filter 134 may be either two types as in the first embodiment, and an electrostatic filter that can be washed with water can be used.

  In many cases, the projection type image display apparatus is used by being attached to a ceiling. On the other hand, if the intake filter is clogged with dust taken together with the outside air for internal cooling, the user needs to clean the intake filter each time. According to the present embodiment, it is possible to extend the time required for clogging by providing a prefilter on an electrostatic filter formed in a pleat shape, and to save the maintenance work. In addition, even when clogged, it can be washed and reused using a pre-filter and electrostatic filter that can be washed with water, so that maintenance costs can be greatly reduced.

  FIG. 10 shows an example in which the dust collecting unit is configured separately.

  The dust capturing unit 141 includes a pre-filter unit 142, a pre-filter cleaning unit 143, a filter feed mechanism 144 not shown, and a fixed filter 145. The pre-filter unit 142 includes a roll-shaped pre-filter 146, a small housing 148 having a connecting portion of the pre-filter 146 with winding shafts 147a and 147b disposed at both ends of the pre-filter 146, and a filter feed mechanism 144. 148 has an opening 149 for allowing air from the air inlet 132 to pass between the winding shafts. Relay rotating shafts 150a, 150b, and 150c are disposed between the two winding shafts 147a and 147b.

  The pre-filter cleaning unit 143 includes a rotary brush 153 rotatably provided in conjunction with partition walls 152a and 152b and a winding shaft 147a partitioning the filter storage unit 151 and a space, and dust provided so as to cover the rotary brush 153. It consists of a protective case 154. The rotating brush 153 is connected to the winding shaft 147a by a plurality of gears not shown. As a result, when the prefilter is rolled up, the rotating brush 153 rotates in the direction opposite to the direction in which the filter is sent, and as shown in the figure, the dust on the prefilter traveling between the relay rotating shafts 150a and 150b is repelled. (Detailed mechanism structure is omitted). Openings are provided in the vicinity of the partition walls 152 a and 152 b of the dust prevention case 154 so that the dust repelled by the rotating brush 153 passes through this and is stored in the dust storage chamber 155. The operation of the dust trapping part 141 will be described below.

  The small casing 148 is designed to be detachable from the main body, and is configured to be detachable from a driving portion provided in the main body (not shown). When a small casing 148 is mounted on the apparatus main body and the projection image display apparatus is used, ambient dust is sucked together with outside air for cooling. The main thing among this dust is caught by the pre-filter 146 provided in the opening part 149 vicinity. However, if dust accumulates, air flow is hindered. In this embodiment, the motor is operated by a timer provided in the control circuit at regular intervals, and the prefilter 146 fixed to the take-up shaft 147a is taken up. Pull out the prefilter 146. By this series of operations, the surface of the pre-filter 146 that adsorbs dust can be sent and a new surface can be pulled out. At this time, the rotary brush 153 is rotated by the rotation of the winding shaft 147a. The rotating direction is opposite to the direction in which the pre-filter 146 is sent, and the dust on the filter is scraped off. The scraped dust is stored in the dust storage chamber 155 through the opening of the dust prevention case 154.

  On the other hand, when the prefilter 146 is wound up by a predetermined amount, the motor is stopped. Then, reverse the motor. As a result, the winding shaft 147b is rotated in the direction of the arrow. As a result, the prefilter 146 is wound up, and the prefilter 146 is pulled back.

  Air permeability can be improved by the above operation. However, the pre-filter 146 that is repeatedly used is difficult to use a strong filter, so it is difficult to increase the dust collecting ability. Therefore, it is set so that relatively large dust is captured here. Fine particles that have passed through the pre-filter 146 are captured by the stationary filter 145. For this reason, the fixed filter 145 takes the form of the pleated filter described in the first embodiment.

  With this configuration, even in a dusty environment, it is possible to eliminate the need for filter cleaning for a longer time than the configuration in which the prefilter is fixed. Here again, the prefilter and the pleated filter material are made washable, and it goes without saying that the fixed filter 145, which is a pleated filter, is provided with a deployable support frame. With this deployable support structure, it is possible to quickly remove dust contained in the pleat valley and dry after washing with water. In addition, it is possible to easily physically stimulate the filter for recharging the static electricity that has been removed by washing with water. Moreover, after drying, it can be easily returned to the original storage state.

DESCRIPTION OF SYMBOLS 101 Case 102 Intake part 103 Exhaust part 104 Axial flow fan 105 Electrostatic filter 106 Filter frame 107 Filter case 109 Slit 110 Thin part 111, 113 Convex part 112 Concave part 114 Hole part 115 Light source 116 Reflective mirror 117 Optical unit 118, 119 Dichroic Mirror 120, 121, 122 Total reflection mirror 123R, 123G, 123B Incident side polarizing plate 124R, 124G, 124B Liquid crystal panel 125R, 125G, 125B Outgoing side polarizing plate 126R, 126B Dichroic reflective film 127 Synthetic prism 128 Projection lens 129 Housing 130 Dust proof glass 131 Power supply 132 Air inlet 133 Pre-filter 134 Pleated electrostatic filter 135 Air intake duct 136 Optical unit duct 137B Opening for blue 137G Green opening 137R Red opening 138 Exhaust fan 139 Light source drive circuit 140 Video signal circuit 141 Dust trapping part 142 Prefilter part 143 Prefilter cleaning part 144 Filter feed mechanism 145 Fixed filter 146 Prefilter 147a, 147b Winding shaft 148 Small Case 149 Opening 150a, 150b, 150c Relay rotating shaft 151 Filter storage 152a, 152b Partition 153 Rotating brush 154 Dust-proof case 155 Dust storage chamber 156 Intake fan 157 Exhaust port

Claims (6)

A rectangular filter,
Including a filter frame having a part that is easy to bend and a part that is difficult to bend periodically in the longitudinal direction of the filter, including or fixing the end part in the short side direction of the filter,
A dust collecting apparatus, wherein the filter frame is bent at an easily bent portion to form the filter in a pleated shape.   The dust collector according to claim 1, further comprising: a housing case capable of housing a pleated filter and a filter frame and having an opening at a portion corresponding to the ventilation portion of the filter.   2. The dust collecting apparatus according to claim 1, wherein the filter frame is made of a resin material, and is formed by insert molding so as to enclose a short side end portion of the filter at the time of injection molding.   The dust collecting apparatus according to claim 1, wherein the filter frame is made of a resin material, and the short side end of the filter is fixed by welding.   2. The dust collecting apparatus according to claim 1, wherein the filter is a material that can be regenerated by cleaning. A light source;
An illumination device for guiding light from the light source device;
An image display element that modulates incident light according to a video signal when the illumination light is incident;
A projection lens that projects the light modulated by the image display element onto a screen;
A circuit unit for driving the light source, a video processing circuit for driving the image display element according to an input signal,
A power supply unit for supplying power to the circuit unit;
An intake device that takes in outside air from the outside;
It consists of a housing that contains these,
A projection display device comprising the dust collecting device according to claim 1 between the intake device and the housing.