JP2008309913A - Filter device and projection video display device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter device capable of stably and highly accurately obtaining accuracy in the shaft position of an attachable/detachable take-up filter, and a projection video display device using the same. <P>SOLUTION: The filter device is provided with first positioning means (circular-arc shaped elastic holding pieces 82d and 82e) for positioning a take-up shaft side coupling part in a direction orthogonal to a fitting direction with respect to a drive shaft side coupling part while elastically holding a filter cartridge 81 between the pieces 82d and 82e in a filter holding part 82, and second positioning means (pressing rib 82g or the like) for positioning the take-up shaft side coupling part in the fitting direction with respect to the drive shaft side coupling part while pressing the filter cartridge 81 in the direction of a filter base part in the filter holding part 82 and the filter cartridge 81. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a filter device and a projection type image display device such as a liquid crystal projector using the filter device, and more particularly to a filter device using a detachable winding filter.

  In a projection-type image display device such as a liquid crystal projector whose brightness has been increased, there is a current situation in which a cooling fan capable of obtaining strong cooling air has to be used in order to suppress a reduction in the lifetime of the optical component due to heat generation.

  In order to prevent dust from entering the apparatus, a filter is provided at the intake port. However, since dust accumulates in this filter, regular maintenance such as dust cleaning is required.

  As a countermeasure, Patent Document 1 discloses a filter delivery-side rotary shaft that winds the air filter material in a roll shape, a filter delivery-side cover that covers the air filter material that is wound around the filter delivery-side rotary shaft, When the filter winding side rotary shaft that winds one end of the air filter material pulled out from the filter sending side rotary shaft and the contamination level of the air filter material in use exceeds the specified value, a contamination detection signal An air filter is disclosed that includes a dirt detecting means for outputting the shaft and a shaft rotating means for rotating the filter winding side rotating shaft when a dirt detection signal is received.

  Further, Patent Document 2 includes a supply roll that supplies a filter, a winding roll that winds the filter, and a frame member that integrally couples both rolls, and the frame member slides on opposite edges. There is disclosed a filter unit that has a member and is attached to a lower portion of a cooling fan by sliding on a rail member attached to a lower portion of a shelf of an electronic device.

Further, Patent Document 3 discloses a casing that is fixed to a lower portion of a cooling fan of an electronic device, and a cartridge that is slid on a rail disposed in the casing so as to be freely inserted into or pulled out from the casing. The cartridge has a supply roll for supplying the filter material and a take-up roll for taking up the filter material, and the gear of the take-up roll is inserted into the casing via the planetary gear when the cartridge is inserted. A filter unit is disclosed that meshes with a drive gear of a drive motor and is rotationally coupled.
JP-A-6-246120 JP 2006-159026 A JP 2006-223958 A

  However, in the filter having the winding mechanism as described above, since the meshing (shaft position) accuracy between the winding shaft side coupling portion and the drive shaft side coupling portion is important, it is necessary to prevent them from shifting. Don't be. And if it becomes a filter which also has a detachable mechanism in addition to a winding mechanism, it will become very difficult to implement | achieve exact meshing precision.

  Accordingly, the present invention has been made to solve such a problem, and a filter device capable of stably and highly accurately realizing the axial position accuracy of a detachable take-up filter and a projection-type image display device using the same. Is intended to provide.

  In order to achieve the above object, a filter device according to a first aspect of the present invention includes a filter cartridge having a ventilation opening and containing a filter supply roll and a take-up roll disposed in the ventilation opening. And a filter holding portion for detachably holding the filter cartridge, and a drive shaft side to which the filter holding portion is attached and the take-up shaft side coupling portion exposed from the filter cartridge held by the filter holding portion is fitted And a filter base portion to which a drive motor having a connection portion is attached, and the winding shaft side connection portion with respect to the drive shaft side connection portion while elastically sandwiching the filter cartridge in the filter holding portion. A first positioning means for positioning in a direction orthogonal to the fitting direction is provided, and the filter holding portion and the filter cart are provided. And a second positioning means for positioning the take-up shaft side connecting portion in the fitting direction with respect to the drive shaft side connecting portion while pressing the filter cartridge in the filter base portion direction. It is what.

  The filter device according to claim 2 is the filter device according to claim 1, wherein the first positioning means has an arc shape corresponding to both ends of the arc shape in which a supply roll and a take-up roll of the filter cartridge are stored. It consists of the elastic clamping piece formed in this.

  The filter device according to claim 3 is the filter device according to claim 1 or 2, wherein the second positioning means is formed at an upper end portion of the filter holding portion and moves in the insertion direction of the filter cartridge. And a rib and a groove formed on both the filter cartridge and the filter holding portion and fitted with the movement of the filter cartridge in the insertion direction. It is characterized by comprising.

  A filter device according to a fourth aspect is the filter device according to any one of the first to third aspects, wherein a magnet is provided at a predetermined position on the outer peripheral side of the drive shaft side coupling portion and the magnetic force of the magnet is detected. A magnetic sensor is provided, and the filter movement amount at the time of winding the filter can be detected based on the output of the magnetic sensor.

  A filter device according to a fifth aspect of the present invention is the filter device according to any one of the first to fourth aspects, further comprising a switch that is turned on / off by the attachment / detachment of the filter cartridge, and the filter device based on the output of the switch cartridge. The present invention is characterized in that the presence or absence of mounting can be detected.

  A filter device according to a sixth aspect is the filter device according to any one of the first to fifth aspects, wherein the ventilation port is provided with the filter, and a cooling fan that sucks air from the ventilation port through the filter. And an opening wall having an opening smaller than the ventilation hole.

  The filter device according to a seventh aspect is the filter device according to the sixth aspect, wherein the ventilation port and the opening have a substantially rectangular shape, and the longitudinal length of the opening is the longitudinal direction of the ventilation port. It is characterized by being formed smaller than the length.

  The filter device according to claim 8 is the filter device according to claim 6 or claim 7, wherein the ventilation port and the opening have a substantially rectangular shape, and a lateral length of the opening is the ventilation port. It is characterized in that it is formed smaller than the horizontal length.

  The filter device according to claim 9 is the filter device according to any one of claims 6 to 8, wherein the size of the opening is set to ½ to ３ of the size of the vent hole. It is characterized by this.

  A projection display apparatus according to a tenth aspect includes the filter device according to any one of the first to ninth aspects at an inlet of a cooling fan, and modulates light emitted from a light source lamp based on a video signal. In addition, the modulated image light is enlarged and projected.

  The projection display apparatus according to claim 11 is the projection display apparatus according to claim 10, wherein both sides of the mounting wall are communicated with the mounting wall provided with the suction port and to which the cooling fan is mounted, and the air volume. An adjustment hole to which the sensor is attached is formed, and the size of the adjustment hole is adjusted so that the detected value of the air volume sensor and the air volume of the cooling fan correspond to each other.

  The projection image display device according to claim 12 is the projection image display device according to claim 11, wherein the air volume sensor has an inflow port through which a detection target wind flows in and an outflow port through which the detection target wind flows. The outlet is attached so as to correspond to the adjustment hole.

  The projection display apparatus according to claim 13 is the projection display apparatus according to claim 10, wherein a step is formed in the duct connected to the discharge port of the cooling fan, and the step wall is formed on the step wall. An adjustment hole for connecting the both sides of the air flow sensor and an air volume sensor is formed, and the size of the adjustment hole is adjusted so that the detected value of the air flow sensor corresponds to the air volume of the cooling fan. Is.

  The projection type image display apparatus according to claim 14 is the projection type image display apparatus according to claim 13, wherein the air volume sensor has an inflow port through which a detection target wind flows in and an outflow port through which the detection target wind flows. The outlet is attached so as to correspond to the adjustment hole.

  The projection display apparatus according to claim 15 is the projection display apparatus according to any one of claims 10 to 14, wherein the adjustment hole has a size in which a driving voltage of the cooling fan is within a usable voltage range. Until the minimum value is reached, the detection value of the air flow sensor is adjusted to be zero.

  According to the filter device of the first aspect of the present invention, the winding shaft side coupling portion is orthogonal to the drive shaft side coupling portion with respect to the drive shaft side coupling portion while elastically holding the filter cartridge between the filter holding portion and the filter shaft. The first positioning means for positioning in the direction is provided, and the take-up shaft side coupling portion is fitted to the drive shaft side coupling portion in the fitting direction while pressing the filter cartridge toward the filter base portion on the filter holding portion and the filter cartridge. By providing the second positioning means for positioning, the fitting (shaft position) accuracy of the detachable take-up filter can be realized stably and with high accuracy simply by inserting the filter cartridge into the filter holding portion. In addition, since the maintenance is simplified, it is effective for cost reduction.

  According to the filter device of the second aspect, the first positioning means is formed of an elastic clamping piece formed in an arc shape corresponding to both arc-shaped end portions in which the supply roll and the take-up roll of the filter cartridge are accommodated. Therefore, even when the filter cartridge is inserted into the filter holding portion and is displaced or vibrated, the filter cartridge always fits in a predetermined position. Insert the filter cartridge while keeping it parallel to the filter holding part, or insert only one side shaft part (one side arcuate end) of the filter cartridge into the corresponding one side arcuate elastic clamping piece. From that point, the other arcuate end may be inserted into the corresponding arcuate elastic clamping piece on the other side.

  According to the filter device of claim 3, the second positioning means has a slope formed on the upper end portion of the filter holding portion so as to press the upper end portion downward as the filter cartridge moves in the insertion direction. Since the rib and the rib and groove formed on both the filter cartridge and the filter holding portion and fitted with the movement of the filter cartridge in the insertion direction are inserted, the upper end portion of the filter cartridge is inserted when the filter cartridge is inserted. The filter cartridge is pressed against the pressing rib, and moves in the direction perpendicular to the inclined surface of the pressing rib and the resultant force in the insertion direction. As a result, the height of the filter cartridge and the groove and rib of the filter holding portion can be matched, and an appropriate fitting height can be realized.

  According to the filter device of the fourth aspect, the magnet is provided at a predetermined position on the outer peripheral side of the drive shaft side coupling portion, and the magnetic sensor that detects the magnetic force of the magnet is provided, and the filter is wound based on the output of the magnetic sensor. Since the filter movement amount at the time can be detected, the filter movement amount at the time of winding the filter can be accurately controlled, and the winding filter can be used effectively without excess or deficiency.

  The filter device according to claim 5 is provided with a switch that is turned on / off by attachment / detachment of the filter cartridge, and can detect whether or not the filter cartridge is attached based on the output of the switch. It is possible to prevent it from being forgotten and used.

  According to the filter device according to claim 6, the opening wall which is arranged between the ventilation port in which the filter is arranged and the cooling fan which sucks air from the ventilation port through the filter and has an opening smaller than the ventilation port. Since the dust accumulates in the filter from a portion corresponding to the opening of the opening wall, a portion where dust is not accumulated remains at the end. Therefore, with a relatively simple configuration, a stable cooling effect can be maintained for a long time until the next filter winding, thereby reducing noise and reducing the number of maintenance. .

  According to the filter device of the seventh aspect, the ventilation port and the opening have a substantially rectangular shape, and the length of the opening in the vertical direction is smaller than the length of the ventilation port in the vertical direction. Since the shape of the opening along the shape of the vent is arranged, the dust accumulation state can be controlled efficiently.

  Further, as in the filter device according to claim 8, the ventilation opening and the opening have a substantially rectangular shape, and the lateral length of the opening is smaller than the lateral length of the ventilation opening. However, since it becomes the shape of the opening along the shape of the vent hole in which the filter is disposed, the dust accumulation state can be controlled efficiently as described above.

  Further, as in the filter device according to claim 9, if the size of the opening is set to 1/2 to 1/3 of the size of the ventilation opening, there is a problem of an increase in intake resistance due to a reduction in the opening. As a result, a stable cooling effect can be maintained for a period of about twice to three times that of the prior art until the next filter winding.

  As in the projection display apparatus according to claim 10, by providing the filter device according to any one of claims 1 to 9 at the intake port of the cooling fan, a projection type capable of obtaining the effects as described above. A video display device can be realized. As described above, in a projection-type image display device such as a liquid crystal projector whose brightness has been increased, a cooling fan capable of obtaining strong cooling air must be used in order to suppress a decrease in the life of optical components due to heat generation. Since there is a current situation, the filter device as described above is particularly effective when applied to such a projection display apparatus.

  According to the projection type image display device of the eleventh aspect, the adjustment hole is provided in the mounting wall provided with the suction port and to which the cooling fan is mounted, and is connected to both sides of the mounting wall and to which the air volume sensor is mounted. When the cooling fan is driven by adjusting the size of this adjustment hole so that the detected value of the air flow sensor corresponds to the air flow of the cooling fan, the suction side of the mounting wall is more negative than the discharge side. The air flow from the discharge side to the intake side is generated in the adjustment hole, and this air flow is detected by the air volume sensor, so that the cooling air can be detected in a stable state regardless of the power of the cooling air. In addition, a detection error suppression effect due to dust adhesion can be obtained, and any cooling fan can be used in a limited operating wind speed range.

  Furthermore, according to the projection display apparatus according to claim 12, in the projection display apparatus according to claim 11, the air volume sensor has an inlet port through which the detection target wind flows in and an outlet port through which the detection target wind flows. Since the outlet is attached to the inside of the cooling fan attachment wall so as to correspond to the adjustment hole, it can be detected in a more stable state.

  On the other hand, according to the projection display apparatus of the thirteenth aspect, the step is formed in the duct connected to the discharge port of the cooling fan, and the air flow sensor is connected to the step wall on both sides of the step wall. An adjustment hole to be attached is formed, and the size of this adjustment hole is adjusted so that the detected value of the air volume sensor and the air volume of the cooling fan correspond to each other. When it flows, turbulent flow is generated inside the stepped wall of the duct, and negative pressure is generated from the outside, and air flows from the outside to the inside of the adjustment hole, and this air flow is detected by an air flow sensor. As above, the cooling air can be detected in a stable state without being affected by the power of the cooling air, and the detection error suppression effect due to dust adhesion can be obtained, and it is compatible with all cooling fans in a limited operating air speed range. Can .

  Furthermore, according to the projection display apparatus according to claim 14, in the projection display apparatus according to claim 13, the air volume sensor has an inlet port through which the detection target wind flows in and an outlet port through which the detection target wind flows. Since the outflow port is attached to the outside of the step wall so as to correspond to the adjustment hole, it can be detected in a more stable state.

  Further, according to the projection display apparatus of claim 15, in the projection display apparatus of claims 11 to 14, the size of the adjustment hole is such that the driving voltage of the cooling fan is the minimum of the operating voltage range. Since the detection value of the air volume sensor is adjusted to 0 until reaching the value, the operating air speed range of the air volume sensor can be used more effectively.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 3 are perspective views showing an overall configuration of a liquid crystal projector which is an embodiment of a projection display apparatus according to the present invention.

  The main body case 2 that forms the outline of the liquid crystal projector 1 includes an upper case 2a and a lower case 2b. When the upper case 2a and the like are removed, the inside appears as shown in FIG.

  The projection lens 3 is exposed at the center of the front surface of the lower case 2b. A maintenance opening 4 is formed at the center of the upper surface of the upper case 2a on the projection lens 3 side. The maintenance opening 4 is provided with a lid 5 that can be opened and closed.

  Further, a cooling inlet 6 is formed on the right side as viewed from the front. As shown in FIG. 2, the air inlet 6 is formed by a lid 7 that can be opened and closed as shown in FIG. 2. The lid 7 is opened and a filter cartridge 81 of a filter unit (filter device) 8 is formed. Is removable.

  Further, on the back side of the lower case 2b, as shown in FIG. 2, an exhaust port 9 made up of a number of slit-shaped vents is provided on the left side, and various input / output cables for audio and video are provided on the right side. An AV panel 10 is provided in which an input / output terminal group for connecting is exposed.

  As shown in FIG. 3, a light source lamp unit 11 is disposed in the back of the right side when viewed from the front, and an optical system 12 extending from the light source lamp unit 11 to the projection lens 3 is disposed inside the main body case 2. The power supply unit 13 is disposed on the left side surface.

  In the vicinity of the light source lamp unit 11, there is exhaust for discharging warm air that has cooled the light source lamp unit 11, the power supply unit 13, and optical components such as a liquid crystal panel and a polarizing plate (not shown) from the exhaust port 9 to the outside. A fan 14 is provided.

  On the other hand, a cooling fan 15 composed of a blower fan (a centrifugal fan called a sirocco fan) is disposed inside the filter unit 8, and the cooling air from the cooling fan 15 passes through a duct to a liquid crystal panel or a polarizing plate. These are cooled by being blown by optical components such as these.

  The liquid crystal projector 1 separates the light emitted from the light source lamp unit 11 into three colors of RGB (red, green, and blue) via an optical system 12 and modulates the light based on the video signal by the liquid crystal panel for each color. Then, the modulated image light is synthesized and enlarged and projected onto the screen via the projection lens 3.

  4A to 4C are overall perspective views of the filter unit 8 in the present embodiment, in which FIG. 4A is a perspective view seen from an obliquely upper outer side, and FIG. 4B is a perspective view seen from an obliquely lower outer side. (C) is the perspective view seen from the inside diagonally upward.

  The filter unit 8 of the present embodiment is attached with a filter cartridge 81 of a detachable take-up filter, a filter holding portion 82 that detachably holds the filter cartridge 81, the cooling fan 15 described above, an air volume sensor described later, and the like. The mounting wall 83 includes a mounting base 83 and a filter base portion 84 to which a drive motor and the like to be described later are attached.

  5 (a) to 5 (c) are perspective views of the filter cartridge alone, (a) is a perspective view seen from obliquely upward on the outside, (b) is a perspective view seen obliquely from the inside, and (c) is the above ( It is an internal block diagram in the state of a).

  As shown in FIG. 5, the filter cartridge 81 of the present embodiment has a lattice-shaped air vent 81 a at the center, and a supply roll for a filter (not shown) disposed on the air vent 81 a on both sides thereof. 81b and a winding roll 81c are accommodated.

  Both ends 81d and 81e in which the supply roll 81b and the take-up roll 81c are accommodated are formed in an arc shape, and the lower end of the take-up shaft 81f of the take-up roll 81c is exposed from the bottom surface of the cartridge case and is described later. A take-up shaft side connecting portion 81g having a shape that fits in the shaft side connecting portion without slipping is formed.

  5A, a positioning rib formed on the filter holding portion 82, which will be described later, is fitted to the center portion in the vertical direction of the arc-shaped end portion (on the supply roll 81b side) 81d positioned at the right end. A groove 81h is formed in the lateral direction, and a positioning described later formed in the filter holding portion 82 is formed at the center in the vertical direction of the arcuate end (winding roll 81c side) 81e positioned at the right end in FIG. Positioning grooves 81i into which the ribs for fitting are fitted are formed in the lateral direction.

  Further, on the lower surface of the filter cartridge 81, a switch rib 81j that abuts on a switch described later provided on the filter base portion 84 protrudes downward.

  6 (a) to 6 (h) are a perspective view and a top view of the filter holding unit alone, (a) is an overall perspective view seen from obliquely upward on the outer side, (b) is an enlarged view of the main part, and (c) is FIG. Overall top view, (d) is an enlarged view of one end, (e) is an enlarged view of the other end, (f) is an overall perspective view showing the main part, and (g) is an enlarged main part. FIG. 4H is an enlarged view of the main part at the upper end. FIGS. 7A to 7E are a perspective view and a top view showing a state in which the filter cartridge is mounted on the filter holding portion. FIG. 7A is a perspective view as seen from obliquely upward on the outside, and FIG. A perspective view seen obliquely from above, (c) is an overall top view, (d) is an enlarged view of one end portion, and (e) is an enlarged view of the other end portion.

  The filter holding portion 82 of the present embodiment holds the above-described filter cartridge 81 in a detachable manner. The filter holding portion 82 has an opening wall 82b in which a lattice-like opening portion 82a is formed below, and both end portions thereof. It consists of elastic pinching pieces 82d and 81e formed in an arc shape corresponding to the arc-shaped end portions 81d and 81e in which the supply roll 81b and the take-up roll 81c of the cartridge 81 are housed. The tip end portion of the arc-shaped elastic clamping piece 82e corresponding to the arc-shaped end portion 81e in which the winding roll 81c of the filter cartridge 81 is accommodated is bent outward. The elastic clamping pieces 82d and 81e are used to position the winding shaft side coupling portion 81g in a direction perpendicular to the fitting direction with respect to the drive shaft side coupling portion described later while elastically clamping the filter cartridge 81. One positioning means is configured.

  On the other hand, the upper end portion of the filter holding portion 82 is located slightly on the left side (the elastic pinching piece 82e side) from the center portion, and has a slope 82f that presses the upper end portion downward as the filter cartridge 81 moves in the insertion direction. A holding rib 82g having (see FIG. 6 (h) and FIG. 10 described later) protrudes forward. Further, the above-described positioning formed on the arcuate end 81d in which the supply roll 81b of the filter cartridge 81 is housed at the center in the vertical direction inside the arcuate elastic clamping piece 82d located at the right end of the filter holding part 82. Positioning ribs 82h that fit into the grooves 81h are provided in the lateral direction. In addition, an arcuate end 81e in which a winding roll 81c of the filter cartridge 81 is housed is formed at the center in the vertical direction of the opening wall surface on the arcuate elastic clamping piece 82e side positioned at the left end of the filter holding portion 82. Positioning ribs 82i that fit into the above-described positioning grooves 81i protrude in the lateral direction. The above-described holding rib 82g, positioning grooves 81h and 81i, and positioning ribs 82h and 82i hold the filter cartridge 81 in the direction of the filter base portion 84 while holding the winding shaft side connecting portion 81g against the drive shaft side connecting portion described later. And second positioning means for positioning in the fitting direction. A positioning rib may be provided on the filter cartridge 81 side, and a positioning groove may be provided on the filter holding portion 82 side.

  FIGS. 8A to 8D are views showing the configuration of the filter base portion. FIG. 8A is a front view showing the filter base portion on which the filter holding portion on which the filter cartridge is mounted is mounted. FIG. The figure which removed and showed the filter base part exterior, (c) is the perspective view which looked at the gear base built in the filter base part from diagonally upward, (d) is the perspective view which similarly looked at the gear base from other diagonally upward It is.

  In the present embodiment, a gear motor 84b as a drive motor is attached to a gear base 84a built in the filter base portion 84, and the winding shaft side exposed from the lower surface of the filter cartridge 81 is exposed to the output shaft of the gear motor 84b. A drive shaft side connecting portion 84g into which the connecting portion 81g is fitted is provided.

  A magnet 84h is attached by embedding or the like at a predetermined position on the outer peripheral side of the drive shaft side connecting portion 84g, and a magnetic sensor for detecting the magnetic force of the magnet 84h is mounted in the vicinity of the drive shaft side connecting portion 84g. A magnetic sensor substrate 84i is attached. As a result, the control unit (CPU or the like) of the liquid crystal projector 1 to which the filter unit 8 is attached is based on the output of the magnetic sensor mounted on the magnetic sensor substrate 84i, and the amount of filter movement (winding) when winding the filter. The rotational speed of the shaft 81f) can be detected. Therefore, the control unit of the liquid crystal projector 1 can accurately control the amount of movement of the filter at the time of winding the filter by controlling the driving of the gear motor 84b, so that the winding filter can be used effectively without excess or deficiency. It has become.

  The gear base 84a built in the filter base 84 is provided with a switch 84j that is turned on / off by a switch rib 81j protruding from the lower surface of the filter cartridge 81 when the filter cartridge 81 is attached or detached. Thus, the control unit of the liquid crystal projector 1 to which the filter unit 8 is attached is configured to detect whether or not the filter cartridge 81 is mounted based on the output of the switch 84j. Therefore, it is possible to prevent the filter cartridge 81 from being used without being attached.

  FIG. 9 is a schematic diagram showing the filter cartridge mounting method and the operation of the first positioning means in the present embodiment.

  The mounting method of the filter cartridge 81 described above corresponds to only the one-side shaft portion (one-side arcuate end portion 81d) of the filter cartridge first, as schematically shown in FIGS. 9 (a) to 9 (c). What is necessary is just to insert in the circular arc-shaped elastic clamping piece 82e of the other side by using the circular arc-shaped elastic clamping piece 82d of the other side as a base point. Although not shown in FIG. 9, the distal end portion of the arc-shaped elastic sandwiching piece 82e on the other side is bent outward as described above, so that it can be easily inserted. As a result, when the filter cartridge 81 is inserted into the filter holding portion 82, the filter cartridge 81 is surely placed in a predetermined position even if it is displaced or vibrated. Accordingly, the winding shaft side connecting portion 81g is positioned in a direction perpendicular to the fitting direction with respect to the drive shaft side connecting portion 84g, that is, directly above the drive shaft side connecting portion 84g, while elastically holding the filter cartridge 81. can do. In addition, if both ends of the arc-shaped elastic clamping pieces 82d and 82e are bent outward, the filter cartridge 81 can be easily kept parallel to the filter holding portion 82 as shown in FIG. Can be inserted.

  FIG. 10 is a schematic diagram showing the operation of the second positioning means when the filter cartridge is mounted.

  As shown in FIGS. 10A to 10D, when the filter cartridge 81 is inserted into the filter holding portion 82, its upper end is pressed against the holding rib 82g, and the filter cartridge 81 is against the inclined surface 82f of the holding rib 82g. Therefore, it moves in the direction which is the resultant force in the vertical direction and the insertion direction. As a result, the positioning grooves 81h, 81i of the filter cartridge 81 and the positioning ribs 82h, 82i of the filter holding portion 82 can be matched to each other, and an appropriate fitting height can be realized. Therefore, the winding shaft side connecting portion 81g can be positioned in the fitting direction with respect to the drive shaft side connecting portion 84g while holding the filter cartridge 81 in the direction of the filter base portion 84.

  As described above, according to the filter unit 8 of the present embodiment, the fitting (shaft position) accuracy of the detachable take-up filter can be stably and highly accurate simply by inserting the filter cartridge 81 into the filter holding portion 82. realizable. In addition, since the maintenance is simplified, it is effective for cost reduction.

  FIG. 11 is a schematic diagram showing the arrangement configuration of the filter unit 8 and the cooling fan (blower fan) 15 in the present embodiment in an easy-to-understand manner. Here, the winding mechanism is omitted and each part is shown in a simplified manner. .

  The filter unit 8 of the present embodiment includes a ventilation port 81a formed in the above-described filter cartridge 81 and provided with a take-up filter 80, and a cooling fan 15 that sucks air from the ventilation port 81a through the filter 80. There is provided an opening wall 82b which is formed in the filter holding part 82 disposed between and has an opening part 82a smaller than the ventilation hole 81a.

  The cooling fan 15 is a blower fan (centrifugal fan called a sirocco fan), and its suction port 15a is disposed toward the opening wall 81. A duct (not shown) is connected to the discharge port 15b. ing.

  In the present embodiment, the ventilation opening 81a and the opening 82a of the opening wall 82b have a substantially rectangular shape, and the vertical length of the opening 82a is smaller than the vertical length of the ventilation opening 81a. is doing.

  More specifically, the size of the opening 82a of the opening wall 82b is set to be ½ to ３ of the size of the ventilation hole 81a. With this configuration, the flow rate of the intake air passing through the opening 82a is faster than in the prior art, and the same amount of cooling air as in the conventional case can be ensured, and there is almost no problem of increasing the intake resistance by reducing the opening 82a. Does not occur.

  In this embodiment, the cooling fan 15 using the blower fan is used. However, as shown in FIG. 12, the filter unit 8 is similar to the above when the cooling fan 16 using the axial fan (propeller fan) is used. It becomes a composition.

  FIGS. 13A to 13C are schematic views showing the dust accumulation state of the filter 80 according to the present embodiment.

  In the present embodiment, since it is configured as described above and intentionally accumulates dust D from a part of the filter 80, there is a dust unaccumulated portion 80a that sucks outside air without resistance until the end. It will be. In other words, until the filter 80 is completely clogged, the dust non-accumulated portion 80a exists, and thus the cooling effect is maintained over a long period until the next filter winding with a relatively simple configuration. Will be able to. In addition, this makes it possible to reduce the number of maintenance operations and to reduce the increase in the number of rotations of the cooling fan, resulting in low noise.

  That is, in the dust accumulation state of the conventional filter 80 shown in FIGS. 14 (a) to 14 (c), the dust D gradually accumulates on the entire surface of the filter 80, so that the cooling performance decreases at the corresponding inclination angle. However, in the dust accumulation state of the filter 80 of the present embodiment shown in FIG. 13, there is a dust non-accumulation portion 80a that sucks outside air without resistance until the end, so that the cooling performance is considerably reduced as compared with the conventional case. A gentle inclination angle is obtained.

  In addition, since dust D continues to accumulate in the dust accumulation portion 80b other than the dust non-accumulation portion 80a in synergy with the filter effect of the accumulated dust, it can be used until more dust D accumulates than before. From this point, it can be seen that it can be used for a longer period of time than before.

  11 and 12, the shape of the opening 82 a of the opening wall 82 b is not particularly specified, and is a wall where a part of the dust-preventing filter 80 is hidden. I just need it. However, in order to efficiently control the dust accumulation state, it is desirable to make the shape of the opening along the shape of the vent 81a where the filter 80 is disposed. That is, as shown in FIG. 11 and FIG. 12, the ventilation opening 81a and the opening 82a of the opening wall 82b form a substantially rectangular shape, and the vertical length of the opening 82a is the vertical length of the ventilation opening 81a. It forms so that it may become smaller than this.

  In addition, the same effect as described above can be obtained even if the ventilation port and the opening have a substantially rectangular shape and the lateral length of the opening is smaller than the lateral length of the ventilation port. .

  Furthermore, by setting the size of the opening 82a of the opening wall 82b to be ½ to の of the size of the ventilation hole 81a, there is a problem of an increase in intake resistance due to a reduction in the size of the opening 82a. With almost no occurrence, a stable cooling effect can be maintained for about twice to three times the conventional time until the next filter winding.

  FIG. 15 is a perspective view of the filter unit 8 and the cooling fan (blower fan) 15 according to the present embodiment as viewed from the inside, FIG. 16 is a perspective view before the cooling fan and the air flow sensor are attached, and FIG. It is a principal part enlarged view.

  In the filter unit 8 of the present embodiment, an adjustment hole 83b is formed in the mounting wall 83 provided with the suction port 83a and to which the cooling fan 15 is mounted so as to communicate with both sides of the mounting wall 83 and to which the air volume sensor 18 is mounted. ing. Then, the size of the adjustment hole 83b is adjusted so that the detected value of the air volume sensor 18 and the air volume of the cooling fan 15 correspond to each other.

  The cooling fan 15 is attached to the mounting wall 83 with the suction port 15a facing the suction port 83a, and a duct (not shown) is connected to the discharge port 15b.

  As shown in the schematic diagrams of FIGS. 18 to 20, the air volume sensor 18 has an inlet 18a having a predetermined area into which the wind to be detected indicated by an arrow flows, and the area gradually increases from the inlet 18a to the opposite surface. The outlet 18b having an opening is provided, and the outlet 18b is attached to the inside of the mounting wall 83 so as to correspond to the adjustment hole 83b.

  Specifically, as shown in FIGS. 15 to 17, the upper and right sides of the air flow sensor 18 are aligned with a bowl-shaped mounting frame 83 c formed on the mounting wall 83, and a screw or the like (not shown) is attached to the lower left of the air flow sensor 18. It is attached through attachment holes 18c formed at the corners and attachment holes 83d formed on the attachment wall 83 side.

  A space between the inlet 18a and the outlet 18b of the air flow sensor 18 is hollow, and a sensor element that operates according to the principle and method described later is attached to the inner surface thereof.

  The size of the adjusting hole 83b is adjusted so that the detection value of the air volume sensor 18 becomes zero until the driving voltage of the cooling fan 15 reaches the minimum value of the operating voltage range.

  Specifically, the operating air speed range of the air volume sensor 18 is 0 to 3.0 m / s, and the operating voltage range of the cooling fan 15 is 5.0 to 13.8 V (wind speed is about 7.5 to about 15. 5 m / s), the size of the adjustment hole 83b is adjusted so that the detection value of the air flow sensor 18 becomes 0 until the drive voltage of the cooling fan 15 reaches 5.0V. In this case, the adjustment hole 83b is a hole having a diameter of about 1.5 mm, so that the operating voltage range of the cooling fan 15 (within the operating air velocity range (0 to 3.0 m / s) of the air volume sensor 18 is set. The wind speed (about 7.5 to about 15.5 m / s) at 5.0 to 13.8 V) can be detected. Since the inlet 18a of the air volume sensor 18 has a predetermined size (area), if the wind speed can be detected, the air volume can be detected from the wind speed and the area of the inlet, but the inlet 18a is always constant. Since the wind speed and the air volume have a one-to-one correspondence with the size (area), if the wind speed is detected as a voltage, the control target can be controlled based on the detected voltage.

  As the air flow sensor 18, for example, a MEMS (Micro-Electro-Mechanical-Systems) flow sensor element manufactured by OMRON Corporation can be used. In this sensor element, an upper insulating thin film and a lower insulating thin film are formed on a silicon base, a heater and a thermopile are formed in the center, and an ambient temperature sensor is formed on the outer side thereof. When there is no flow, the temperature distribution around the heater is symmetrical, and when the flow is received, the temperature on the windward side of the heater is low, the temperature on the leeward side is high, and the temperature equilibrium state is lost. By sensing this temperature difference as the electromotive force difference of the thermopile, the flow velocity according to the mass flow rate can be measured.

  In the above configuration, when the cooling fan 15 is driven with the filter cartridge 81 mounted (the output of the switch 84j in FIG. 8 is on), the intake side (outside) of the mounting wall 83 is the discharge side (outside). The air pressure is lower than that on the inner side, and an air flow is generated in the adjustment hole 83b from the discharge side (inner side) to the intake side (outer side), and this air flow is detected by the air volume sensor 18 as described above. As described above, the wind speed of the cooling air itself generated by driving the cooling fan 15 (for example, about 7.5 to about 15.5 m / s) is not directly detected, and the wind speed (0) flowing through the adjustment hole 83b formed in the mounting wall 83 is not detected. ~ 3.0m / s) is detected, and the wind speed of the cooling air is indirectly detected, so that the cooling air can be detected in a stable state without being influenced by the power of the cooling air, and dust adheres to it. The detection error suppression effect due to the above can be obtained, and any cooling fan can be accommodated within a limited operating wind speed range.

  Further, it is possible to keep the adjustment hole 83b within the operating wind speed range of the air volume sensor 18 only by making the size of the adjustment hole 83b appropriate, and it is possible to expect a cost reduction effect by reducing the number of verifications. That is, in the past, since the cooling air itself by the cooling fan was directly targeted for detection, an enormous amount of time was required to fall within the operating air velocity range of the air volume sensor. In the present invention, this can be reduced. it can. For example, since the projector controls the rotation speed of the cooling fan according to the usage environment, the wind speed is constantly changing. For this reason, if the cooling air itself is the detection target, it is necessary to find a place that is within the operating air speed range of the air volume sensor, and because the cooling air itself is the detection target, the wind speed can be easily increased due to errors in the molded product. It is necessary to take measures against changes. As a result, verification parameters (verification items) become enormous. In contrast, in the present invention, the cooling air itself is not directly detected, so the molding error of the molded product is almost unaffected, and the wind speed is detected even at the mounting position when the cooling fan speed is small. Since it is only necessary to set the adjustment hole to a size that is difficult to perform, the number of verifications can be reduced. In other words, this reduction can reduce the verification time, resulting in cost reduction.

  The air volume sensor 18 has an inlet 18a through which the detection target wind flows in and an outlet 18b through which it flows, and is mounted on the inner side of the mounting wall 83 of the cooling fan 15 so that the outlet 18b corresponds to the adjustment hole 83b. Therefore, it can be detected in a more stable state without being affected by outside air or the like.

  Further, the size of the adjustment hole 83b is adjusted so that the detected value of the air volume sensor 18 becomes 0 until the driving voltage of the cooling fan 15 reaches the minimum value of the operating voltage range. The range can be used more effectively.

  Based on the detection value detected by the air flow sensor 18 as described above, the cooling fan 15 is controlled, and the detection value of the air flow sensor 18 is a predetermined value even if the drive voltage of the cooling fan 15 is, for example, the maximum operating voltage range. In the following cases, it is determined that the filter 80 is clogged with dust, the gear motor 84b shown in FIG. 8 is driven, and the filter cartridge 81 is driven based on the output of the magnetic sensor mounted on the magnetic sensor substrate 84i. The winding roll 81c rotates a predetermined number of times, and a filter surface that is not automatically clogged is fed out from the supply roll 81b.

  FIG. 21 is a schematic diagram showing another embodiment of the present invention, and the same reference numerals are used for the same or corresponding parts as those of the embodiment.

  In the present embodiment, a step 21 is formed in the duct 20 connected to the discharge port 15b of the cooling fan 15 described above, and both sides of the step wall 22 are connected to the step wall 22 and an air volume sensor 18 is attached. The adjustment hole 22a to be formed is formed. In the same manner as in the above embodiment, the size of the adjustment hole 22a is adjusted, and the detected value of the air volume sensor 18 and the air volume of the cooling fan 15 are made to correspond to each other.

  In addition, the air volume sensor 18 has an inlet 18a through which the detection target wind flows in and an outlet 18b through which the wind to be detected flows in the same manner as in the above embodiment, so that the outlet 18b corresponds to the adjustment hole 22a outside the step wall 22. Attached to.

  Further, the size of the adjusting hole 22a is adjusted so that the detected value of the air volume sensor 18 becomes zero until the driving voltage of the cooling fan 15 reaches the minimum value of the operating voltage range, as in the above embodiment.

  In the above configuration, when the cooling fan 15 is driven and cooling air flows into the duct 20 with the filter cartridge 81 mounted (the output of the switch 84j in FIG. 8 is on), the step wall 22 of the duct 20 A turbulent flow R is generated on the inner side and becomes negative pressure on the outer side, and an air flow is generated in the adjusting hole 22 from the outer side to the inner side, and this air flow is detected by the air volume sensor 18. Similarly, the cooling air can be detected in a stable state without being influenced by the power of the cooling air, and an effect of suppressing detection error due to dust adhesion can be obtained, and any cooling fan can be accommodated in a limited operating air speed range.

  In addition, the air volume sensor 18 has an inlet 18a through which the detection target wind flows in and an outlet 18b through which the wind to be detected flows in the same manner as in the above embodiment, so that the outlet 18b corresponds to the adjustment hole 22a outside the step wall 22. Therefore, it can be detected in a more stable state without being affected by the cooling air in the duct 20.

  Further, the size of the adjustment hole 22a is adjusted so that the detection value of the air volume sensor 18 becomes 0 until the drive voltage of the cooling fan 15 reaches the minimum value of the use voltage range, as in the above embodiment. The operating wind speed range of the air volume sensor 18 can be used more effectively.

  In FIG. 21, the step 21 in which the diameter of the duct 20 decreases in the direction in which the cooling air flows is formed. However, a step in which the diameter of the duct 20 increases in the direction in which the cooling air flows may be provided. That is, the level difference may be such that the direction of the cooling air flow in FIG. 10 is reversed.

  In each of the above embodiments, a liquid crystal projector using a liquid crystal panel as a light modulation element is shown as a projection image display device. However, the present invention is also applied to a projection image display device having another image light generation system. be able to. For example, the present invention can also be applied to a projector using a DLP (Digital Light Processing; registered trademark of Texas Instruments (TI)) system.

  In addition, as described above, in a projection display apparatus such as a liquid crystal projector whose brightness has been increased, a cooling fan capable of obtaining strong cooling air must be used in order to suppress a decrease in the life of optical components due to heat generation. The filter unit 8 as described above is particularly effective when applied to such a projection-type image display device because there is a current situation, but various electronic devices that require both cooling and measures against dust, etc. Even if applied to the above, almost the same effect as described above can be expected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an overall configuration of a liquid crystal projector that is an embodiment of a projection display apparatus according to the present invention, and is an external perspective view seen from diagonally forward. Similarly, the perspective view which looked at the state which open | released the cover body of the inlet port from back diagonally upward. Similarly, the perspective view which looked at the state which removed the upper case etc. so that the inside was visible from the diagonally upper front. BRIEF DESCRIPTION OF THE DRAWINGS It is the whole perspective view of the filter unit in this embodiment, (a) is the perspective view seen from the outer side diagonal upper direction, (b) is the perspective view seen from the outer side diagonal lower side, (c) is the perspective view seen from the inner side diagonal upper side. . FIG. 3A is a perspective view of a filter cartridge alone, FIG. 3A is a perspective view as seen from the outside and obliquely upward, FIG. 2B is a perspective view as seen from the inside and obliquely upward, and FIG. 3C is an internal configuration diagram in the state of FIG. A perspective view and a top view of the filter holding unit alone, (a) is an overall perspective view seen obliquely from the outside, (b) is an enlarged view of the main part, (c) is an overall top view, and (d) is one side thereof. Enlarged view of the end, (e) is also an enlarged view of the other end, (f) is an overall perspective view showing the essential part, (g) is an enlarged view of the essential part, and (h) is an essential part of the upper end. Enlarged view. A perspective view and a top view showing a state in which the filter cartridge is mounted on the filter holding portion, (a) is a perspective view seen from the outside obliquely upward, (b) is a perspective view seen from the inside obliquely upward, and (c) is a perspective view. The whole top view, (d) is the enlarged view of the one side edge part, (e) is the enlarged view of the other side edge part. It is a figure which shows the structure of a filter base part, (a) is a front view which shows the filter base part in which the filter holding part with which the filter cartridge was mounted | worn is mounted, (b) is the figure which removed and showed the filter base part exterior (C) is the perspective view which looked at the gear base built in the filter base part from diagonally upward, (d) is the perspective view which looked at the gear base from the other diagonally upward. The schematic diagram which shows the mounting method of the filter cartridge in this embodiment, and the effect | action of a 1st positioning means. Similarly, the schematic diagram which shows the effect | action of a 2nd positioning means. The schematic diagram which showed clearly the arrangement structure of the filter unit and cooling fan (blower fan) in this embodiment. Similarly, the schematic diagram when an axial fan is used as a cooling fan. The schematic diagram which shows the dust accumulation state of the filter by this embodiment. The schematic diagram which shows the dust accumulation state of the conventional filter. The perspective view which looked at the filter unit and cooling fan (blower fan) in this embodiment from the inside. Similarly, the perspective view before attachment of the cooling fan and the air flow sensor. The principal part enlarged view of FIG. The perspective view which showed the air quantity sensor typically. Similarly, the front view, side view, and rear view. Similarly, the perspective view which shows typically the adjustment | control hole of an air volume sensor and a mounting wall. The schematic diagram which shows other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal projector 2 Main body case 3 Projection lens 6 Air intake port 8 Filter unit 80 Filter 80a Dust accumulation | storage part 80b Dust accumulation | storage part D Dust 81 Filter cartridge 81a Ventilation hole 81b Supply roll 81c Winding roll 81d, 81e Arc-shaped edge part 81f Winding Take-up shaft 81g Take-up shaft side connecting portion 81h, 81i Positioning groove 81j Switch rib 82 Filter holding portion 82a Opening portion 82b Opening wall 82d, 82e Elastic clamping piece 82f Slope 82g Holding rib 82h, 82i Positioning rib 83 Mounting wall 83a Suction port 83b Adjusting hole 83c Mounting frame 83d Mounting hole 84 Filter base part 84a Gear base 84b Gear motor 84g Drive shaft side connecting part 84h Magnet 84i Magnetic sensor board 84j Switch 9 Exhaust port 11 Light The lamp unit 12 optical system 13 power supply unit 14 exhaust fan 15 cooling fan (blower fan)
16 Cooling fan (axial fan)
18 Airflow sensor 18a Inlet 18b Outlet 18c Mounting hole 20 Duct 21 Step 22 Step wall 22a Adjustment hole

Claims (15)

A filter cartridge having a ventilation opening and containing a filter supply roll and a take-up roll disposed in the ventilation opening, a filter holding part for detachably holding the filter cartridge, and the filter holding part are attached. And a filter base portion to which a drive motor having a drive shaft side coupling portion to which a winding shaft side coupling portion exposed from the filter cartridge held by the filter holding portion is fitted is attached,
First positioning means for positioning the take-up shaft side connecting portion with respect to the drive shaft side connecting portion in a direction perpendicular to the fitting direction while elastically holding the filter cartridge to the filter holding portion. And secondly positioning the take-up shaft side connecting portion in the fitting direction with respect to the drive shaft side connecting portion while pressing the filter cartridge in the filter base portion direction to the filter holding portion and the filter cartridge. A filter device provided with positioning means.   The said 1st positioning means consists of the elastic clamping piece formed in the circular arc shape corresponding to the circular arc-shaped both ends in which the supply roll and winding roll of the said filter cartridge were accommodated. Filter device.   The second positioning means includes a pressing rib formed on an upper end portion of the filter holding portion and having an inclined surface that presses the upper end portion downward as the filter cartridge moves in the insertion direction, the filter cartridge, and the filter 3. The filter device according to claim 1, further comprising a rib and a groove that are formed on both of the holding portions and engage with each other when the filter cartridge moves in the insertion direction.   A magnet is provided at a predetermined position on the outer peripheral side of the drive shaft side coupling portion, and a magnetic sensor for detecting the magnetic force of the magnet is provided so that the amount of filter movement during filter winding can be detected based on the output of the magnetic sensor. The filter device according to any one of claims 1 to 3, wherein the filter device is characterized.   The switch according to any one of claims 1 to 4, further comprising a switch that is turned on / off when the filter cartridge is attached / detached, so that the presence or absence of the filter cartridge can be detected based on an output of the switch. Filter device.   An opening wall is provided between the ventilation port in which the filter is arranged and a cooling fan that sucks air from the ventilation port through the filter, and has an opening smaller than the ventilation port. The filter device according to any one of claims 1 and 5.   The said ventilation opening and the said opening part comprise a substantially rectangular shape, and the length of the vertical direction of the said opening part is formed smaller than the length of the vertical direction of the said ventilation hole. Filter device.   The said ventilation opening and the said opening part comprise a substantially rectangular shape, and the length of the horizontal direction of the said opening part is formed smaller than the length of the horizontal direction of the said ventilation hole. Item 8. The filter device according to Item 7.   The filter device according to any one of claims 6 to 8, wherein the size of the opening is set to ½ to ３ of the size of the ventilation opening.   A filter device according to any one of claims 1 to 9 is provided at an air inlet of a cooling fan, and the light emitted from the light source lamp is modulated based on a video signal, and the modulated video light is enlarged and projected. Projection-type image display device characterized by the above.   The air flow sensor is provided with an adjustment hole that is connected to both sides of the mounting wall and to which an air flow sensor is attached, and the size of the adjustment hole is adjusted. The projection display apparatus according to claim 10, wherein the detected value is associated with the air volume of the cooling fan.   The said air volume sensor has an inflow port into which detection object wind flows in, and an outflow port from which it flows out, and is attached inside said mounting wall so that said outflow port may correspond to said adjustment hole. 11. A projection display apparatus according to item 11.   A step is formed in the duct connected to the discharge port of the cooling fan, and an adjustment hole is formed in the step wall so as to communicate with both sides of the step wall and to which an air flow sensor is attached. 11. The projection display apparatus according to claim 10, wherein the projection value display unit adjusts the detected value of the air volume sensor to correspond to the air volume of the cooling fan.   The air volume sensor has an inflow port through which a detection target wind flows in and an outflow port through which the wind to be detected flows, and is attached to the outside of the step wall so that the outflow port corresponds to the adjustment hole. 14. A projection display apparatus according to 13.   11. The size of the adjustment hole is adjusted so that a detection value of the air flow sensor becomes zero until a driving voltage of the cooling fan reaches a minimum value of a usable voltage range. Item 15. The projection type image display device according to any one of Item 14.