JP2008170808A - Dust-collecting mechanism, projection image display apparatus and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust-collecting mechanism configured to unnecessitate cleaning of a filter at any time, to remove dust sticking to the filter so as not to cause filter-clogging. <P>SOLUTION: The dust-collecting mechanism includes: a fan 10 for discharging external air from a discharge hole 8 through an air suction filter 15 disposed on the air suction hole 14 of a housing 4; an air suction hole 14 and a dust guiding hole 16, both formed in one surface of the housing 4; and a rectangular cylindrical dust-collecting cylinder 20 made movable on the outer surface of the housing 4, for removing and collecting the dust sticking to the air suction filter 15. The dust-collecting cylinder 20 includes: an external air sending hole 24 disposed one end thereof, communicating with the air suction hole 14; a dust discharge hole 26 disposed at the other end thereof, communicating with the dust guiding hole 16; and an air suction hole 28 for the dust-collecting cylinder disposed adjacent to the external air sending hole 24, for introducing the external air. When the external air sending hole 24 or the dust discharge hole 26 is in a communicative state, the dust discharge hole 26 or the external air sending hole 24 comes in contact with the outer surface of the housing 4 so as to be closed in accordance with the communicative state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dust collection mechanism that removes dust intruding into an electronic device, a projection display apparatus including the dust collection mechanism, and an electronic device.

2. Description of the Related Art Conventionally, electronic devices such as personal computers and projectors have been provided with a heat exhaust fan to cool components.
In particular, in a projector, a high-intensity discharge lamp used as a light source becomes hot as it emits light (approximately 1000 ° C. at the highest temperature) when it is lit, so air is allowed to pass through the projector housing to cool the light source. I am doing so.
Such a projector introduces air (outside air) through a mesh-shaped air filter for removing dust, but the air filter accumulates dust over time and becomes clogged. Decreases and cooling efficiency decreases.

There are the following proposals for the problem of this type of dust accumulation.
In the example shown in Patent Document 1, when the air filter collects dust and becomes dirty, the cooling air does not sufficiently flow in, so the temperature inside the electronic device rises, and when the temperature sensor detects a temperature rise, When the detection result is sent to the determination circuit and it is determined that the detection result is higher than the predetermined temperature, an operation start signal is sent to the timer to start the operation, and the timer rotates the motor for a predetermined time, thereby winding the air filter. The take-up roll is rotated so that the dirty air filter is wound up and the air filter is replaced.

In the example shown in Patent Document 2, a cooling fan is provided at the bottom of the housing, and a circular dust filtration filter is provided in the vicinity of the fan so as to be opposed to the fan, and is eccentrically supported so as to be rotatable about a center. Thus, the position of the shaft is provided outside the rotation range (air path) of the fan blades, and when it is clogged, it is rotated appropriately so that the portions that are not clogged are used sequentially.
JP-A-8-152242 Japanese Patent Laid-Open No. 9-200664

However, in the conventional patent documents 1 and 2, the filter is replaced after dust is attached to the filter and becomes clogged, and a technique for preventing the filter from being clogged is not disclosed.
Conventionally, in order to prevent the filter from being clogged, it has been necessary to clean the filter as needed.
Therefore, as a dust collection mechanism that collects dust with a filter and removes dust attached to the filter, a structure that does not clog the filter without cleaning the filter at any time has been demanded.

  The present invention has been made in view of such circumstances, and the object of the present invention is to provide a dust collecting cylinder in the housing, and the dust collecting cylinder collects dust removed from the filter, An object of the present invention is to provide a dust collection mechanism that can remove dust from a filter so that the filter is not clogged by providing a configuration for exhausting air from an exhaust hole using a fan.

  Another object of the present invention is to provide a filter that guides the dust collection tube along the recess of the housing by providing a structure in which the recess formed in the housing serves as a guide path for the dust collection tube. An object of the present invention is to provide a dust collection mechanism capable of removing attached dust.

  Another object of the present invention is to provide a structure for restricting the moving range of the dust collecting cylinder by contacting the convex portion of the dust collecting cylinder and the groove end of the support guide groove of the housing concave portion. It is an object of the present invention to provide a dust collection mechanism that can remove the dust adhering to the filter by restricting the forward and reverse movements within the moving range.

  Another object of the present invention is that the convex portion of the dust collecting cylinder comes into contact with one groove end of the support guide groove formed in the concave portion of the casing, and the suction hole of the casing and the second opening of the dust collecting cylinder. And a dust collection mechanism capable of collecting dust with a filter of a housing intake hole.

  Another object of the present invention is that the convex part of the dust collecting cylinder abuts the other groove end of the support guide groove formed in the concave part of the housing, and the dust guide hole of the casing and the third opening of the dust collecting cylinder An object of the present invention is to provide a dust collection mechanism capable of discharging dust from a dust collection cylinder together with outside air from a casing exhaust hole by providing a structure that forms a dust discharge air passage in communication with a portion.

  Another object of the present invention is to provide a dust removal projection on the dust collecting cylinder on the periphery of the second opening, so that the dust removal projection is in contact with the filter of the air intake hole to remove the attached dust and collect the dust. An object of the present invention is to provide a dust collection mechanism that allows a dust cylinder to collect dust.

  Another object of the present invention is to provide a control unit that rotates the fan and moves the dust collection cylinder, thereby allowing the intake hole of the housing and the second opening of the dust collection cylinder to communicate with each other. An object of the present invention is to provide a dust collecting mechanism that forms an air passage and can collect dust with a filter in a housing intake hole.

  Another object of the present invention is to provide a control unit that rotates the fan and moves the dust collection cylinder so that the dust guide hole of the housing and the third opening of the dust collection cylinder communicate with each other. An object of the present invention is to provide a dust collecting mechanism that forms a discharge air passage and can discharge dust from a dust collecting cylinder together with outside air from a housing exhaust hole.

  Another object of the present invention is to provide a projection-type image display apparatus that can remove dust from a filter every time projection ends by providing the dust collection mechanism of the present invention.

  Another object of the present invention is to form a dust collection air passage with the rotation of the fan and collect dust with a filter, and form a dust discharge air passage after the projection is finished to discharge dust from the exhaust hole. By providing the projection-type image display device, the filter is not clogged and the light source has good cooling efficiency.

  Another object of the present invention is to move the dust collecting cylinder together with the shielding operation of the lens cover after the projection by providing a lens cover that can be integrated with the dust collecting cylinder to shield the projection lens. Another object of the present invention is to provide a projection display apparatus that can collect dust collected by a dust collecting cylinder attached to a filter.

  Another object of the present invention is to provide a structure in which an elastically deformable pin erected on the lens cover is fitted into a guide groove for guiding the lens cover, so that the dust collecting cylinder is formed in the recess of the housing. In addition to fitting, the lens cover pins can be fitted into the guide groove, and when the lens cover is guided in the guide groove, the dust collecting cylinder removes dust collected on the filter and collects it. It is an object of the present invention to provide a projection-type image display device that can perform the above-mentioned.

  Another object of the present invention is to provide a pin that prohibits movement of the lens cover at both ends of the guide groove by providing a pin that prohibits movement of the lens cover at one end of the guide groove or the other groove end. It is an object of the present invention to provide a projection type image display apparatus that can form an air path or a dust discharge air path, and can collect dust collected by a dust collection cylinder after the filter collects dust.

  Another object of the present invention is that the fan switch is arranged in parallel with the projection lens, and the switch cover of the fan can be operated in response to the lens cover shielding the projection lens. It is an object of the present invention to provide a projection type image display apparatus in which the fan cannot be stopped unless the lens cover is shielded and the fan is not forgotten to be turned on.

  Another object of the present invention is to provide an electronic apparatus that can remove dust from a filter every time after the operation by providing the dust collecting mechanism of the present invention.

  The dust collection mechanism of the present invention is provided in the housing in a dust collection mechanism including a filter provided to cover the intake hole of the housing and a fan for exhausting air from the exhaust hole of the housing through the filter. A dust guide hole for guiding the dust to the exhaust hole and a dust collecting cylinder for removing and collecting the dust adhering to the filter, and the dust collecting cylinder is closed at one end and at the other end A first opening for introducing outside air, a second opening that is provided on a surface on the other end side facing the housing, and that communicates with the intake hole, and faces the housing And a third opening that is communicated with the dust guide hole, and the third opening abuts the housing when the second opening communicates. When the third opening communicates, the second opening is configured to be in contact with the casing and closed. It characterized that you have.

  In the dust collecting mechanism of the present invention having such a configuration, the dust guide hole of the housing and the third opening of the dust collecting cylinder communicate with each other, and the housing closes the second opening. When the dust collection cylinder moves in a direction in which the suction hole and the second opening of the dust collection cylinder communicate with each other, and the second opening of the dust collection cylinder communicates with the intake hole of the casing, the third opening becomes the housing. Abutting on the body, the housing closes the third opening. The fan exhausts air from the exhaust hole of the casing to create a negative pressure inside the casing, introduces outside air from the first opening of the dust collection cylinder, and passes through the first opening, the intake hole, and the filter from the exhaust hole. Is discharged. As the outside air is introduced from the first opening, the filter collects dust, and dust accumulates in the filter. As the dust collecting cylinder moves in the reverse direction, the dust collecting cylinder removes and collects the dust adhering to the filter. When the third opening of the dust collecting cylinder communicates with the dust guide hole of the housing, the second opening contacts the housing and the housing closes the second opening. The fan exhausts air from the exhaust hole of the housing to create a negative pressure in the dust collection cylinder, introduces the outside air from the first opening, and removes the dust together with the outside air from the exhaust hole through the third opening and the dust guide hole. Discharge.

  The dust collection mechanism of the present invention has a recess formed in the housing, and the dust collection cylinder is fitted into the recess, and the recess supports the dust collection cylinder and guides The dust collecting cylinder has an elastically deformable convex portion that fits into the supporting guide groove at an end portion of a surface facing the concave portion.

  In the dust collecting mechanism of the present invention having such a configuration, when the dust collecting cylinder is pressed against the concave portion of the housing, the convex portion of the surface facing the concave portion of the dust collecting cylinder is elastically deformed, and the convex portion is fitted into the support guide groove. The convex part returns to the original shape, and the dust collecting cylinder fits into the concave part. The support guide groove supports and guides the convex portion of the dust collecting cylinder, and the dust collecting cylinder moves in the concave portion of the housing.

  In the dust collection mechanism of the present invention, the convex portion is in contact with one groove end or the other groove end of the support guide groove to limit a movement range of the dust collection cylinder.

  In the dust collecting mechanism of the present invention having such a configuration, the dust collecting cylinder moves in the recessed portion of the housing within the moving range in the forward and reverse directions.

  In the dust collecting mechanism of the present invention, the convex portion abuts on one end of the support guide groove, the intake hole communicates with the second opening, and the first opening to the exhaust hole through the filter. It is characterized in that a dust collecting air passage is formed.

  In the dust collecting mechanism of the present invention having such a configuration, the dust collecting cylinder moves in the concave portion of the casing, the convex portion of the dust collecting cylinder comes into contact with one groove end of the support guide groove, and the dust collecting cylinder is in the suction hole of the casing. The second opening of the cylinder communicates, the housing closes the third opening, and forms a dust collecting air passage from the first opening to the exhaust hole through the filter.

  In the dust collection mechanism of the present invention, the convex portion contacts the other groove end of the support guide groove, the dust guide hole communicates with the third opening, and the dust guide hole communicates with the first opening from the first opening. A dust discharge air passage leading to the exhaust hole is formed.

  In the dust collecting mechanism of the present invention having such a structure, the dust collecting cylinder moves in the reverse direction of the concave portion of the casing, and the convex portion of the dust collecting cylinder comes into contact with the other groove end of the supporting guide groove, so that the dust guiding of the casing is performed. The third opening of the dust collecting cylinder communicates with the hole, the casing closes the second opening, and reaches the exhaust hole from the first opening through the dust guiding hole for guiding the dust together with the outside air introduced into the dust collecting cylinder. A dust discharge air passage is formed.

  The dust collection mechanism of the present invention is characterized in that a dust removal protrusion is provided on a peripheral edge of the second opening, and the dust collection cylinder is configured such that the dust removal protrusion is in contact with the filter.

  The dust collecting mechanism of the present invention having such a configuration removes dust adhering to the filter by the dust removing projections contacting the filter as the dust collecting cylinder moves through the housing. A dust collector collects the removed dust.

  In the dust collection mechanism of the present invention, the dust collection cylinder has a rack on a surface facing the casing, and a first driving unit that drives the fan is provided in the casing, and the peeking outward from the casing. A pinion that is screwed with the rack, a second drive unit that rotates the pinion, and a control unit that controls driving of the first drive unit and rotation of the second drive unit, The control unit rotates the fan by driving the first driving unit to introduce outside air from the first opening, and moves the dust collection cylinder by rotating the second driving unit, so that the intake hole And the second opening are in communication with each other, and the filter collects dust.

  In the dust collecting mechanism of the present invention configured as described above, the control unit causes the fan to rotate by driving the first driving unit, and the rack screwed to the rotating pinion to rotate by the rotation of the second driving unit. Converted to linear motion, the dust collection cylinder moves, the intake hole and the second opening communicate with each other, the housing closes the third opening to form a dust collection air passage, and from the first opening Outside air is introduced, and the filter collects dust through the second opening and the intake hole.

  In the dust collection mechanism of the present invention, the control unit moves the dust collection cylinder by the rotation of the second drive unit to communicate the dust guide hole with the third opening, and passes through the dust guide hole. The dust in the dust collecting cylinder is discharged from the exhaust hole.

  In the dust collecting mechanism of the present invention having such a configuration, the rack that is screwed to the reversely rotating pinion is converted into a linear motion by the rotation of the second driving unit, and the dust collecting cylinder is in the reverse direction. The dust guide hole and the third opening communicate with each other, the housing closes the second opening to form a dust discharge air passage, and the outside air is introduced from the first opening. Dust in the dust collecting cylinder is discharged from the exhaust hole through the opening and the dust guide hole.

  A projection-type image display device according to the present invention includes the dust collection mechanism described in any one of the above.

When the projection type image display apparatus of the present invention having such a configuration is used, the dust guide hole of the housing and the third opening of the dust collecting cylinder communicate with each other, and the housing closes the second opening. In this state, the control unit moves the dust collecting cylinder in a direction in which the intake hole of the housing and the second opening of the dust collecting tube communicate with each other by the rotation of the second driving unit, and the housing opens to the third opening. The intake hole communicates with the second opening. The control unit drives the first drive unit to rotate the fan to discharge air from the exhaust hole of the housing, introduce negative air into the housing and introduce outside air from the first opening, and the second opening and intake air. The filter collects dust through the hole, and the fan exhausts from the exhaust hole. For example, the control unit controls a switch of the light source driving unit of the projection type video display device so that the light source is turned on and projected. During projection, the control unit is driven by the first drive unit to rotate the fan to discharge air from the exhaust hole of the housing, and negative pressure is applied to the inside of the housing to cool the light source from the first opening. The filter is collected through the second opening and the intake hole, and the fan exhausts heat from the exhaust hole together with the outside air.
After the projection, the control unit turns off the light source by controlling a switch of the light source driving unit, for example, and after the predetermined time has elapsed, the fan is stopped by driving the first driving unit. With the rotation of the second drive unit, the control unit moves the dust collecting cylinder in the reverse direction, removes and collects dust from the filter, and stops. At this time, the casing closes the second opening, and the third opening and the dust guide hole communicate with each other. The control unit drives the first drive unit to rotate the fan to discharge air from the exhaust hole of the housing, to make the dust collection cylinder negative pressure, and to introduce outside air into the dust collection cylinder from the first opening, The fan discharges the collected dust together with the outside air from the exhaust hole through the third opening and the dust guide hole.
Therefore, the projection type image display apparatus of the present invention removes dust from the filter every time after projection ends.

  The projection-type image display device according to the present invention is configured to form the dust collection air passage along with the rotation of the fan, and to form the dust discharge air passage after the projection ends. .

In the projection type image display apparatus of the present invention having such a configuration, when the fan rotates, the dust guide hole of the housing communicates with the third opening of the dust collecting cylinder, and the housing opens the second opening. From the closed state, the dust collection cylinder moves in a direction in which the intake hole of the housing and the second opening of the dust collection cylinder communicate with each other, and the intake hole and the second opening communicate with each other. The fan exhausts air from the exhaust hole of the housing to create a negative pressure inside the housing, introduces outside air from the first opening, and the filter collects dust through the second opening and the intake hole, and removes outside air from the exhaust hole. A dust collection air passage is formed to cool the light source.
After the projection, the dust collecting cylinder moves in the reverse direction, and the dust guide hole and the third opening communicate. The fan discharges air from the exhaust hole of the housing to create a negative pressure inside the dust collection cylinder, introduces outside air from the first opening, and discharges dust together with the outside air from the exhaust hole through the third opening and dust guide hole. A dust discharge air passage is formed.

  The projection type image display apparatus of the present invention is characterized in that the casing has a projection lens, and the dust collecting cylinder integrally has a lens cover that shields and protects the projection lens.

In the projection type image display apparatus of the present invention having such a configuration, for example, when the projection lens is shielded by the lens cover after the projection is finished, the dust collecting cylinder moves together with the shielding operation by the lens cover. The dust attached to the filter is removed, and the dust collecting cylinder collects the dust.
In the projection display apparatus according to the present invention, the communication between the intake hole and the second opening or the dust guide hole and the third opening is made to correspond to the unshielded state or the shielded state of the projection lens by the lens cover. The dust collecting air passage or the dust discharging air passage is formed. When the lens cover shields the projection lens, a dust collecting air passage is formed, and the fan exhausts air from the exhaust hole of the housing to create a negative pressure in the housing, so that the outside air is discharged from the first opening. To collect dust. When the lens cover shields the projection lens, the dust collection cylinder moves to remove and collect dust from the filter. When the lens cover shields the projection lens, a dust discharge air passage is formed, and the fan makes the dust collection cylinder have a negative pressure, introduces outside air from the first opening, and discharges the dust from the exhaust hole.
The dust collecting cylinder repeatedly moves corresponding to the formation of the dust collecting air passage or the dust discharging air passage.

  In the projection type image display device of the present invention, the lens cover is provided with an elastically deformable pin, and a guide groove for fitting the pin to guide the pin of the lens cover is provided in the housing. It is provided.

  In the projection type image display device of the present invention having such a configuration, when the dust collecting cylinder integral with the lens cover is pressed against the concave portion of the housing, the convex portion on the surface facing the concave portion of the dust collecting cylinder is elastically deformed. Then, it fits into the support guide groove of the recess and returns to its original shape. At this time, the pin of the lens cover comes into contact with the housing and elastically deforms, fits into the guide groove of the housing, and returns to the original shape. The support guide groove supports and guides the dust collecting cylinder, and the guide groove guides the lens cover within the pin movement range.

  The projection type image display device of the present invention is characterized in that the pin abuts against one end of the guide groove or the other end of the guide groove to inhibit the movement of the lens cover.

  In the projection type image display apparatus of the present invention having such a configuration, the pin is brought into contact with one of both ends of the guide groove to prohibit the movement of the lens cover.

  In the projection type image display device of the present invention, the switch of the fan is arranged in parallel with the projection lens, the lens cover shields the projection lens at the end of the groove, and unshields the switch. The projection lens is unshielded at the other groove end, and the switch is shielded.

  In the projection type image display device of the present invention having such a configuration, when the lens cover shields the fan switch during projection, the switch operation is impossible, and after the projection ends, the lens cover moves to shield the projection lens. The fan switch is not shielded and the switch can be operated.

  An electronic device according to the present invention includes the dust collection mechanism according to any one of the present inventions.

In the electronic apparatus of the present invention configured as described above, the inside of the housing is negatively pressured by the fan, the outside air is introduced from the first opening, is collected by the filter of the intake hole, and the outside air is discharged from the exhaust hole. After the operation is completed, the dust collecting cylinder moves to remove dust attached to the filter and collect it. The fan makes the dust collection cylinder have a negative pressure, introduces outside air into the dust collection cylinder from the first opening, and discharges the collected dust from the exhaust hole.
Therefore, in the electronic device of the present invention, the dust on the filter is removed every time after the operation is completed.

The dust collection mechanism of the present invention has an effect that the filter is not clogged because the dust collection cylinder is provided in the housing, and the dust collection cylinder removes and collects dust adhering to the filter and exhausts it from the exhaust hole by the fan. .
Therefore, the dust collection mechanism of the present invention does not need to be cleaned at any time.

  In the dust collecting mechanism of the present invention, the concave portion formed in the housing is used as a guide path for the dust collecting tube, so that dust attached to the filter can be removed by guiding the dust collecting tube along the concave portion of the housing. It has the effect.

  In the dust collecting mechanism of the present invention, the convex part of the dust collecting cylinder and the groove end of the support guide groove of the housing concave part come into contact with each other to limit the movement range of the dust collecting cylinder. There is an effect that dust adhering to the filter can be removed by limiting within the moving range.

  In the dust collecting mechanism of the present invention, the convex portion of the dust collecting cylinder abuts at one end of the support guide groove formed in the concave portion of the housing, and the intake hole of the housing communicates with the second opening of the dust collecting cylinder. Thus, the dust collecting air passage is formed, so that the dust can be collected by the filter of the housing intake hole.

  In the dust collecting mechanism of the present invention, the convex portion of the dust collecting cylinder comes into contact with the other end of the support guide groove that supports the dust collecting cylinder and restricts the moving range, and the dust guide hole of the housing and the third opening of the dust collecting cylinder Since the dust discharge air passage is formed in communication with the part, the dust in the dust collecting cylinder can be discharged together with the outside air from the housing exhaust hole.

  In the dust collection mechanism of the present invention, the dust removal protrusion of the dust collection cylinder is provided at the periphery of the second opening, so that the dust removal protrusion contacts the filter of the intake hole to remove the attached dust, and the dust collection cylinder It has the effect that dust can be collected.

  Since the dust collection mechanism of the present invention includes a control unit that rotates the fan and moves the dust collection cylinder, the dust collection air passage is made to communicate with the intake hole of the housing and the second opening of the dust collection cylinder. And the dust can be collected by the filter of the housing intake hole.

  Since the dust collecting mechanism of the present invention includes a control unit that rotates the fan and moves the dust collecting cylinder, the dust guide hole of the housing and the third opening of the dust collecting cylinder communicate with each other. A path is formed, and dust in the dust collecting cylinder can be discharged together with outside air from the exhaust hole.

  Since the projection type image display apparatus of the present invention includes the dust collection mechanism of the present invention described above, it has an effect that dust on the filter can be removed after each projection.

The projection-type image display device of the present invention forms a dust collection air passage with the rotation of the fan and collects dust with a filter, and after the projection ends, forms a dust discharge air passage to discharge dust from the exhaust hole. As a result, the filter is not clogged, and the light source has a good cooling efficiency.
Therefore, the projection-type image display device of the present invention does not need to clean the filter at any time and becomes maintenance-free. Further, even if different air passages such as a dust collection air passage and a dust discharge air passage are formed, it is not necessary to install a new fan, and the projection type image display device casing can be reduced in size and cost. . Further, since dust on the filter is removed every time the projection display apparatus is used, the cooling effect of the light source during the operation of the projection display apparatus is not reduced, and the life of the light source and internal components is extended. be able to.

  Since the projection-type image display apparatus of the present invention includes a lens cover that can shield the projection lens integrally with the dust collecting cylinder, the dust collecting cylinder is moved together with the shielding operation of the lens cover after projection ends. The dust collecting cylinder has an effect that dust attached to the filter can be removed and collected.

  In the projection type image display device of the present invention, since the elastically deformable pin standing on the lens cover is fitted into the guide groove for guiding the lens cover, the dust collecting cylinder is formed in the recess of the housing. In addition to fitting, the lens cover pins can be fitted into the guide groove, and when the lens cover is guided in the guide groove, the dust collecting cylinder removes dust collected on the filter and collects it. Has the effect of being able to.

  Since the projection type image display device of the present invention is provided with a pin that prohibits movement of the lens cover at one end of the guide groove or the other groove end, the lens cover is prohibited from moving at both groove ends of the guide groove. The air passage or the dust discharge air passage can be formed, and after the filter collects dust, the dust collecting cylinder has an effect that dust attached to the filter can be removed and collected.

  In the projection type image display apparatus of the present invention, the fan switch is arranged in parallel with the projection lens, and the fan switch can be operated in response to the lens cover shielding the projection lens. This has the effect that the fan cannot be stopped until after the cover is shielded. Furthermore, at the start of use, the lens cover shields the projection lens and the fan switch can be operated. Since the lens cover is moved after the fan switch is pressed, the fan switch is not forgotten to be turned on.

  Since the electronic device of the present invention includes the above-described dust collection mechanism of the present invention, it has an effect that the dust on the filter can be removed after each operation.

Hereinafter, preferred embodiments of a dust collection mechanism according to the present invention will be described with reference to the drawings. The embodiment according to the present invention will be described by taking a projection type image display device including the dust collecting mechanism of the present invention as an example.
(Embodiment 1)
1 is a perspective view from above showing a projection-type image display device including a dust collection mechanism according to Embodiment 1, and FIG. 2 is a perspective view from below showing a bottom surface of the projection-type image display device with a dust collection cylinder removed. FIG. 3 is a perspective view from above showing a part of the dust collecting mechanism, and FIG. 4 is a perspective view from above showing the dust collecting cylinder.
Note that FIG. 3 is obtained by removing the upper housing of the projection display apparatus 2 of FIG. 1, and the light source, the optical system, and the like are omitted.

The projection-type image display device 2 includes a light source, a condensing optical system, a video display unit, a projection optical system, and the like (not shown) housed in a substantially rectangular housing 4 in plan view. Projection lens 6 is provided for projection. The projection-type image display device 2 includes legs 5, 5, and 5 for adjusting the position of the projected image at two places side by side on the lower side of the front surface on the side of the projection lens 6 and one place at the approximate center of the rear part.
A rectangular exhaust hole 8 is provided in a lattice shape substantially at the center of the side surface 3 of the housing 4, and an exhaust fan 10 is provided inside the housing 4 of the exhaust hole 8. The fan 10 cools a light source that generates heat by generating an air flow in the housing 4 by introducing outside air into the housing 4 through the intake holes 14 and exhausting the air from the exhaust holes 8.

A concave guide path 12 is formed on the lower surface of the housing 4 over the entire width from one side surface 3 to the other side surface 7 of the housing 4. Support guide grooves 22a and 22b for supporting and guiding dust collecting cylinders 20 described later are formed on the front wall and the rear wall of the guide path 12, respectively. The guide path 12 is a rectangular cylindrical dust collection cylinder. 20 is movably fitted.
At the rear edge of the upper surface 23 of the dust collecting cylinder 20 facing the upper surface of the guide path 12, a rack 21 is provided that extends in the direction of the side surface 3 of the housing 4 along the support guide groove 22 b of the rear wall of the guide path 12.

  In addition, a rectangular opening 17 is formed on the upper surface of the support guide groove 22b on the upper surface of the guide path 12, and the pinion 19 is partially exposed from the opening 17 and screwed into the rack 21 of the dust collecting cylinder 20. It comes to match. The pinion 19 is attached to the drive shaft of the motor 18 disposed in the housing 4 near the opening 17.

A rectangular dust guide hole 16 is formed on the upper surface of the guide path 12 near one side surface 3 of the housing 4, and the dust guide hole 16 is formed on the upper surface of the guide path 12 near the other side surface 7 of the housing 4. A wide rectangular intake hole 14 is also formed. The widths of the intake holes 14 and the dust guide holes 16 are substantially the same as the width of the guide path 12. As shown in FIG. 3, a dust guide hole 16 is opened near the fan 10.
A rectangular intake filter 15 is disposed inside the housing 4 so as to cover the intake hole 14, and is supported by the edge of the intake hole 14.

The dust collection cylinder 20 is molded of a synthetic resin. As shown in FIG. 4, one end portion 29 of the dust collection cylinder 20 has a grid-like dust collection cylinder air intake hole 28 (the first collection hole 28). 1 opening) is provided, and the other end 31 of the dust collecting cylinder 20 is closed.
The dust collecting cylinder 20 is provided on the side surface 7 side of the housing 4 with an outside air delivery hole 24 (second opening) of the same size and shape corresponding to the intake hole 14 at one end of the upper surface 23. And the other end of the same upper surface 23 is provided with a dust discharge hole 26 (third opening) of the same size and shape corresponding to the dust guide hole 16.
The length of the dust collection cylinder 20 is longer than the length from the edge on the side surface 7 side of the intake hole 14 to the edge on the side surface 3 side of the dust guide hole 16, and the intake hole 14 of the housing 4 and the intake hole for the dust collection cylinder When the 28 communicates, the side surface 3 of the housing 4 and the end 31 of the dust collecting cylinder 20 are flush with each other. Further, when the dust collecting cylinder 20 is fitted into the guide path 12 of the housing 4, the lower surface of the dust collecting cylinder 20 is flush with the outer surface of the housing 4.

When the dust collection cylinder 20 moves along the guide path 12 and the suction hole 14 of the housing 4 and the suction hole 28 for the dust collection cylinder communicate with each other, the dust removal protrusion 25 that comes into contact with the periphery of the suction hole 14 sends out the outside air. At the periphery of the hole 24, it is erected in a cylindrical shape. When the dust collection cylinder 20 moves in the reverse direction of the guide path 12 and the dust guide hole 16 of the housing 4 and the dust discharge hole 26 of the dust collection cylinder 20 communicate with each other, the contact with the periphery of the dust guide hole 16 is abutted. The contact portion 27 is erected in a cylindrical shape at the periphery of the dust discharge hole 26.
The heights of the dust removal protrusions 25 and the contact portions 27 are equal to each other by securing a clearance that allows the pinion 19 and the rack 21 to be screwed together. The pinion 19 and the rack 21 convert the rotational movement of the drive shaft of the motor 18 into a linear movement, and reciprocate the dust collection cylinder 20 along the guide path 12.

  When the dust collecting cylinder 20 is fitted into the guide path 12, the U-shaped tongues 30 and 32 having a U-shape in plan view formed in an elastically deformable manner are arranged side by side at both ends of the surfaces facing the support guide grooves 22a and 22b, respectively. Two cylindrical pins (convex parts) 30a, 30b, 32a, 32b are respectively provided on the tongues 30, 30, 32, 32 so as to stand outward from the dust collecting cylinder 20. .

The pins 30a and 32a are fitted into one support guide groove 22a of the guide path 12, the pins 30b and 32b are fitted into the other support guide groove 22b, and the dust collecting cylinder 20 is supported by the support guide groove 22a, It is supported by 22b and is slidable.
Each of the tongue portions 30 and 32 is formed by making a transverse U-shaped cut at both ends of the surface of the dust collecting cylinder 20 facing the support guide grooves 22a and 22b. , 32, 32 are provided with pins 30a, 30b, 32a, 32b which are elastically deformable.

5 is a perspective view from below showing the projection type video display apparatus during projection according to the first embodiment, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a projection type video display apparatus when dust is discharged. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7.
When the dust collection cylinder 20 is disposed in the guide path 12 of the projection display apparatus 2, the lower surface 38 of the dust collection cylinder 20 and the lower surfaces 40, 40 of the housing 4 are flush with each other to form a uniform surface. It is like that.

When the pins 32a and 32b of the dust collecting cylinder 20 (see FIG. 4) abut against the ends 42a and 42b of the support guide grooves 22a and 22b, respectively (see FIG. 7), The other end 31 of the dust collecting cylinder 20 is flush with the other (see FIG. 5).
Further, as shown in FIG. 6, the suction hole 14 on the housing 4 side is in contact with the outside air delivery hole 24 of the dust collecting cylinder 20 with the dust removal protrusion 25 coming into contact with the peripheral edge thereof, and the contact portion 27 is formed in the housing. 4, the dust discharge hole 26 of the dust collecting cylinder 20 is closed by the lower surface of the housing 4.
Therefore, the outside air introduced from the dust collection cylinder intake hole 28 passes through the outside air delivery hole 24, the intake hole 14 and the intake filter 15, and is discharged from the exhaust hole 8 together with the heat of the light source by the fan 10. At this time, the intake filter 15 collects dust.
The air passage that introduces outside air into the housing 4 thus formed and collects the dust is referred to as a dust collection air passage.

Further, when the pins 30a and 30b of the dust collecting cylinder 20 (see FIG. 4) abut on the other ends 44a and 44b of the support guide grooves 22a and 22b (see FIG. 5), respectively, the other side surface 7 of the housing 4 is obtained. And one end 29 of the dust collecting cylinder 20 are flush with each other (see FIG. 7).
Further, as shown in FIG. 8, the dust guide hole 16 on the housing 4 side is in contact with the dust discharge hole 26 of the dust collecting cylinder 20 with the contact portion 27 coming into contact with the periphery thereof, and the outside air delivery hole 24 is provided in the housing. It is blocked by the lower surface of the body 4.
Therefore, the outside air introduced from the dust collection cylinder intake hole 28 passes through the dust discharge hole 26 and the dust guide hole 16 and is discharged together with the dust collected by the dust collection cylinder 20 from the exhaust hole 8 by the fan 10.
The air path through which outside air is introduced into the dust collection cylinder 20 formed in this way and dust is discharged is called a dust discharge air path.

Next, the operation of the first embodiment will be described.
FIG. 9 is a partial functional block diagram of the projection display apparatus according to the first embodiment, FIG. 10 is a schematic diagram showing dust collection by the intake filter, and FIG. 11 is a schematic diagram showing removal of dust attached to the intake filter. FIG. 12 is a schematic view showing dust discharge. In FIG. 9, drive control units such as a condensing optical system and a video display unit of the projection video display device 2 are omitted.
In the projection display apparatus 2 according to the first embodiment, at the start of use, the pins 30a and 30b of the dust collecting cylinder 20 are in contact with the other ends 44a and 44b of the support guide grooves 22a and 22b, respectively (FIG. 4 and FIG. 7 is stopped, with the side surface 7 of the housing 4 and the end 29 of the dust collecting cylinder 20 being flush with each other (this state is referred to as “dust collection end position”). reference).

  When the projection type image display device 2 is used with the light source turned on, the pins 32a and 32b of the dust collecting cylinder 20 are in contact with the ends 42a and 42b of the support guide grooves 22a and 22b, respectively. Of the dust collecting cylinder 20 and the end 31 of the dust collecting cylinder 20 are flush with each other, the intake hole 14 of the housing 4 communicates with the outside air delivery hole 24 of the dust collecting cylinder 20, and from the dust collecting cylinder intake hole 28. The outside air can be introduced and exhausted from the exhaust hole 8 by the fan 10 (this state is referred to as “origin position”, see FIG. 5).

  In the projection type video display device 2 according to the first embodiment, first, when the start button of the operation unit 1 of the projection type video display device 2 is pressed (see FIG. 1), the control unit 50 includes the duct motor driving unit 52. By controlling the (second drive unit), the motor 18 is driven to rotate the pinion 19 so that the rack 21 moves linearly, and the dust collection cylinder 20 returns from the dust collection end position to the origin position and stops. At this time, the outside air delivery hole 24 and the intake hole 14 of the dust collection cylinder 20 communicate with each other, and the lower surface of the housing 4 closes the dust discharge hole 26 (see FIG. 6).

  Next, the control unit 50 controls the fan motor driving unit 54 (first driving unit) to drive a fan motor (not shown) so that the fan 10 creates a negative pressure in the housing 4. Outside air is introduced from the dust collection cylinder intake hole 28, dust is collected by the intake filter 15, the outside air is introduced into the housing 4, and the outside air is discharged from the exhaust hole 8. The control unit 50 may drive the fan motor by controlling the fan motor driving unit 54 when the start button of the operation unit 1 is pressed.

Next, the control unit 50 performs pulse drive control of the light source drive unit 56 so that the light source (not shown) is turned on and performs drive control of the condensing optical system and the image display unit (not shown). Images are projected in series from the projection lens 6 and displayed on a screen (not shown). At this time, the light source generated by the outside air introduced into the housing 4 is cooled, and the fan 10 exhausts heat from the exhaust hole 8.
Then, as shown in FIG. 10, the dust D of the outside air introduced into the housing 4 adheres to the intake filter 15 and accumulates.

The projection of the projection display apparatus 2 is finished, the light source is turned off, and the fan 10 stops after a predetermined time has elapsed.
Next, when the end button of the operation unit 1 is pressed, the control unit 50 performs reverse rotation control of the duct motor driving unit 52, so that the dust collection cylinder 20 collects dust from the origin position as shown in FIG. It moves toward the end position (see the white arrow in FIG. 11). As the dust collection cylinder 20 moves, the dust removal protrusion 25 moves in contact with the intake filter 15 and scrapes off the dust D adhering to the intake filter 15.

Next, when the dust collection cylinder 20 reaches the dust collection end position, the control unit 50 controls the duct motor drive unit 52 to stop the motor 18 and stop the dust collection cylinder 20. At this time, the dust discharge hole 26 of the dust collecting cylinder 20 and the dust guide hole 16 of the housing 4 communicate with each other, and the outside air delivery hole 24 is blocked by the lower surface of the housing 4 (see FIGS. 8 and 12). ).
Then, the control unit 50 controls the fan motor driving unit 54 to drive the fan motor, and the fan 10 discharges air from the exhaust hole 8 to make the inside of the dust collecting cylinder 20 have a negative pressure. As shown by the arrows in FIG. 12, outside air flows in from the dust collecting cylinder intake holes 28, the dust D rides on the flow of the outside air, passes through the dust discharge holes 26, and the fan 10 removes the dust D together with the outside air from the exhaust holes 8. Discharge.

  Finally, the control unit 50 controls the fan motor drive unit 54 after a predetermined time has elapsed since the dust collection cylinder 20 reached the dust collection end position, whereby the fan motor is stopped and the fan 10 is stopped.

As described above, in the first embodiment, the dust collection cylinder 20 is activated after the projection of the projection display apparatus 2 and the dust D adhering to the intake filter 15 is automatically removed. Therefore, the intake filter 15 is clogged. Therefore, it is not necessary to clean the intake filter 15 at any time.
Therefore, the maintenance-free projection display apparatus 2 that eliminates the need for the user to clean the intake filter 15 can be realized.
In the first embodiment, different air paths are formed during the operation of the projection display device 2 and when the intake filter 15 is cleaned. It is not necessary to install a fan for use, and the housing 4 can be reduced in size and cost.
Furthermore, in Embodiment 1, since the dust D is removed from the intake filter 15 every time the projection display apparatus 2 is used, the cooling efficiency of the light source during the operation of the projection display apparatus 2 is not reduced. The life of the light source and internal parts can be extended.

(Embodiment 2)
In the first embodiment, the duct motor that drives the dust collecting cylinder is used at the start of use of the projection display apparatus 2 and after the projection ends. However, in the second embodiment, at the start of use of the projection display apparatus 2 and The dust collection cylinder is moved manually after the projection. Hereinafter, members that are substantially the same as or related to the first embodiment will be described with the same reference numerals.

FIG. 13 is a perspective view from above showing the dust collecting cylinder according to the second embodiment, and FIG. 14 is a perspective view from below showing the lower surface of the projection display apparatus with the dust collecting cylinder removed.
The dust collection cylinder 60 according to the second embodiment is an integrated lens cover 62 that is a L-shaped plate member that protects the projection lens 6, and the lens cover 62 is a dust collection cylinder intake hole 28. Formed on the side.

  The lens cover 62 is provided with a cover portion 66 that protects the projection lens 6 at the edge of the extending portion 64 that extends from the lower surface 38 of the dust collecting cylinder 60. The extension part 64 and the cover part 66 are rectangular, and the extension part 64 is in contact with the lower surface 72 of the housing 4 so that the cover part 66 can shield the projection lens 6 (see FIG. 16).

  A fan switch 80 for turning on and off the projection lens 6 and the side and fan 10 is provided. When the cover part 66 shields the projection lens 6, the fan switch 80 is not shielded by the cover part 66, and the fan switch 80 of the fan 10 can be turned on and off (see FIG. 16). When the projection lens 6 is not shielded, the fan switch 80 is shielded by the cover portion 66 and cannot be turned on / off (see FIG. 15). When the fan switch 80 is turned off, the projection display apparatus 2 is turned off.

The extending portion 64 is formed with an elastically deformable tongue portion 68 at substantially the center, and a cylindrical pin 70 is erected on the tongue portion 68. The tongue portion 68 has a U-shaped cut in the extending portion 64, and a pin 70 is erected at a U-shaped curved portion so as to be elastically deformable.
A guide groove 74 for attaching and guiding the lens cover 62 to the outside of the housing 4 is provided on the lower surface 72 of the housing 4 of the projection display apparatus 2. Concave portions 76 and 78 are formed at both ends of the guide groove 74, and the pin 70 of the lens cover 62 slides by pressing the groove of the guide groove 74 according to the movement of the dust collecting cylinder 60. When the end portion is reached, the pin 70 is fitted in each of the recesses 76 and 78.

FIG. 15 is a perspective view from below showing the projection type video display device during projection according to the second embodiment, and FIG. 16 is a perspective view from below showing the projection type video display device during dust discharge.
In the projection display apparatus 2 according to the second embodiment, the state of the dust collection cylinder 60 at the dust collection end position at the start of use and the origin position at the end of projection is the same as in the first embodiment. In the second embodiment, as shown in FIG. 15, the pin 70 of the lens cover 62 fits into the recess 76 of the guide groove 74 at the origin position, and the pin 70 of the lens cover 62 at the dust collection end position as shown in FIG. Is fitted into the recess 78 of the guide groove 74 so that the lens cover 62 shields and protects the projection lens 6.
Therefore, in the second embodiment, the movement range of the lens cover 62 by the guide groove 74 and the movement range of the dust collecting cylinder 60 by the support guide grooves 22a and 22b are the same.

Next, the operation of the second embodiment will be described.
FIG. 17 is a schematic diagram showing dust collection by the intake filter according to the second embodiment, FIG. 18 is a schematic diagram showing removal of dust attached to the intake filter, and FIG. 19 is a schematic diagram showing dust discharge.
In the projection display apparatus 2 according to the second embodiment, first, referring to FIG. 15 and FIG. 16, the lens cover 62 that shields and protects the projection lens 6 is manually pushed in the direction to release the shielding. At this time, the tongue portion 68 of the lens cover 62 is elastically deformed, the pin 70 of the tongue portion 68 comes out of the concave portion 78 of the guide groove 74, and the pin 70 slides in the groove of the guide groove 74.

  As the lens cover 62 moves, the dust collection cylinder 60 is guided and moved by the support guide grooves 22a and 22b, and the pins 32a and 32b on both sides of the dust collection cylinder 60 are connected to one end 42a of each support guide groove 22a and 22b, The dust collecting cylinder 60 stops in contact with 42b, and at the same time, the pin 70 of the lens cover 62 fits into the recess 76 of the guide groove 74. At this time, the intake hole 14 of the housing 4 communicates with the outside air sending hole 24 for sending the outside air of the dust collecting cylinder 60, and the lower surface of the housing 4 closes the dust discharge hole 26.

  Next, referring to FIG. 9, when the start button of the operation unit 1 (see FIG. 1) of the projection display apparatus 2 is pressed, the control unit 50 controls the fan motor driving unit 54 to A fan motor (not shown) is driven so that the fan 10 creates a negative pressure in the housing 4, introduces outside air from the dust collection cylinder intake holes 28, collects dust with the intake filter 15, and enters the housing 4. Outside air is introduced and the outside air is discharged from the exhaust hole 8. When the start button is pressed, the control unit 50 may control the fan motor driving unit 54 to drive the fan motor and then move the lens cover 62 manually.

Next, the control unit 50 performs pulse drive control of the light source drive unit 56 so that the light source (not shown) is turned on and performs drive control of the condensing optical system and the image display unit (not shown). Images are projected in series from the projection lens 6 and displayed on a screen (not shown). At this time, the light source generated by the outside air introduced into the housing 4 is cooled, and the fan 10 exhausts heat from the exhaust hole 8.
Then, as shown in FIG. 17, the dust D of the outside air introduced into the housing 4 adheres to the intake filter 15 and accumulates.

  When projection of the projection display apparatus 2 is completed, the control unit 50 controls the light source driving unit 56 to turn off the light source, and controls the fan motor driving unit 54 after a predetermined time has elapsed, thereby controlling the fan 10. Stops.

Next, when the lens cover 62 is manually pushed in a direction to shield the projection lens 6, the tongue portion 68 of the lens cover 62 is elastically deformed, and the pin 70 of the tongue portion 68 comes out of the recess 76 of the guide groove 74, The pin 70 slides in the guide groove 74.
As the lens cover 62 moves, the dust collecting cylinder 60 is guided by the support guide grooves 22a and 22b and moves from the origin position toward the dust collecting end position (see the white arrow in FIG. 18). As the dust collection cylinder 60 moves, the dust removal protrusion 25 moves in contact with the intake filter 15 as shown in FIG. 18 and scrapes the dust D adhering to the intake filter 15 into the dust collection cylinder 60. I will drop it.

  Next, when the dust collection tube 60 reaches the dust collection end position, the pin 70 of the lens cover 62 fits into the recess 78 of the guide groove 74, and the lens cover 62 shields and protects the projection lens 6, and the dust collection tube. The dust discharge hole 26 of 60 and the dust guide hole 16 of the housing 4 communicate with each other, and the lower surface of the housing 4 closes the outside air delivery hole 24 (see FIGS. 16 and 19). At this time, the lens cover 62 is not shielded, and the fan switch 80 can be operated.

  When the end button of the operation unit 1 is pressed, the control unit 50 controls the fan motor driving unit 54 to drive the fan motor, and the fan 10 discharges air from the exhaust hole 8 to collect dust. As shown by the arrow in FIG. 19, the inside of the cylinder 60 is set to a negative pressure, and the outside air flows in from the dust collecting cylinder intake hole 28, the dust D rides on the outside air flow, passes through the dust discharge hole 26, and the fan 10 Dust D is discharged from the exhaust hole 8 together with outside air.

  Finally, when the fan switch 80 is turned off, the fan 10 stops and the power of the projection display apparatus 2 is turned off.

Note that the controller 50 may stop the fan motor and stop the fan 10 by controlling the fan motor driving unit 54 after the predetermined time has elapsed.
In addition, the fan 10 is stopped after the projection is finished, and the fan motor is driven to rotate the fan 10 when dust is discharged. However, the fan 10 is not stopped after the projection is finished and is rotated until the dust discharge is finished. Finally, the fan switch 80 may be turned off to stop the fan 10.

As described above, in the second embodiment, the dust collecting cylinder 60 is attached to the intake filter 15 together with the operation of shielding the projection lens 6 by shielding the lens cover 62 after the projection-type image display apparatus 2 is projected. D can be removed.
Therefore, in the second embodiment, the lens cover 62 that protects the projection lens 6 is integrated with the dust collection cylinder 60, so that the user can perform the shielding operation of the lens cover 62 without using the duct motor. The dust D adhering to the intake filter 15 can be removed. Furthermore, the fan switch 80 of the fan 10 is arranged in parallel with the projection lens 6, and the fan switch 80 of the fan 10 can be operated in response to the lens cover 62 shielding the projection lens 6. The fan 10 can be stopped only after the lens cover 62 is shielded.

  In the second embodiment, the lens cover 62 is manually shielded without using the duct motor. However, as in the first embodiment, the dust collecting cylinder 60 is automatically moved using the duct motor to cover the lens cover. 62 may be caused to perform a shielding operation and a shielding release operation.

In the first and second embodiments, outside air is introduced into the dust collection cylinder and the dust D is discharged together with the outside air. However, the dust collection cylinder may be removed after the dust collection to remove the dust D. In this case, it is preferable to eliminate the other ends 44 a and 44 b of the support guide grooves 22 a and 22 b so that one end of each of the support guide grooves 22 a and 22 b is opened to the side portion of the housing 4.
In addition, although the lens cover is L-shaped as viewed from the side, the U-shaped lens may be used. In the case of a U-shaped lens cover in a side view, a pin can be projected from either or both of the lateral surfaces to form a stopper.
Furthermore, although the projection type image display device has been exemplified as an electronic device, the present invention is not limited thereto, and the dust collection mechanism according to the present invention is applied to any electronic device or lighting fixture that introduces outside air into the housing. Can do.
Note that the electronic device includes a lighting fixture.

It is a perspective view from the upper side which shows a projection type video display apparatus provided with the dust collection mechanism which concerns on Embodiment 1. FIG. It is a perspective view from the lower part which shows the lower surface of the projection type video display apparatus which removed the dust collecting cylinder. It is a perspective view from the upper part which shows a part of dust collection mechanism. It is a perspective view from the upper part which shows a dust collection cylinder. It is a perspective view from the lower part which shows the projection type video display apparatus at the time of the projection which concerns on Embodiment 1. FIG. It is VI-VI sectional drawing of FIG. It is a perspective view from the lower part which shows the projection type video display apparatus at the time of dust discharge | emission. It is VIII-VIII sectional drawing of FIG. 2 is a partial functional block diagram of the projection display apparatus according to Embodiment 1. FIG. It is a schematic diagram which shows the dust collection by an intake filter. It is a schematic diagram which shows the removal of the dust adhering to an intake filter. It is a schematic diagram which shows discharge of dust. It is a perspective view from the upper side which shows the dust collection cylinder which concerns on Embodiment 2. FIG. It is a perspective view from the lower part which shows the lower surface of the projection type video display apparatus which removed the dust collecting cylinder. It is a perspective view from the lower part which shows the projection type video display apparatus at the time of the projection which concerns on Embodiment 2. FIG. It is a perspective view from the lower part which shows the projection type video display apparatus at the time of dust discharge | emission. 6 is a schematic diagram showing dust collection by an intake air filter according to Embodiment 2. FIG. It is a schematic diagram which shows the removal of the dust adhering to an intake filter. It is a schematic diagram which shows discharge of dust.

Explanation of symbols

2 Projection-type image display device 4 Housing 6 Projection lens 8 Exhaust hole 10 Fan 12 Guide path (concave)
14 Intake hole 15 Intake filter (filter)
16 Dust guide hole 20 Dust collection cylinders 22a and 22b Support guide groove 24 Outside air delivery hole (second opening)
25 Dust removal protrusion 26 Dust discharge hole (third opening)
28 Intake hole for the dust collection cylinder (first opening)
30a, 30b, 32a, 32b Pin (convex part)
50 control unit 52 duct motor drive unit (second drive unit)
54 Fan motor drive unit (first drive unit)
62 Lens cover 70 Pin 74 Guide groove 80 Fan switch (switch)

Claims (15)

In a dust collection mechanism comprising a filter provided to cover the intake hole of the housing, and a fan that exhausts air from the exhaust hole of the housing through the filter,
A dust guide hole provided in the housing for guiding dust to the exhaust hole;
A dust collecting cylinder that removes and collects dust adhering to the filter, and
The dust collecting cylinder is
One end is closed,
A first opening provided at the other end for introducing outside air;
A second opening that is provided on a surface of the other end facing the housing and is capable of communicating with the intake hole;
A third opening that is provided on a surface of the one end portion facing the housing and is capable of communicating with the dust guide hole;
When the second opening communicates, the third opening is closed by abutting against the housing,
The dust collection mechanism is configured so that the second opening is in contact with and closed by the housing when the third opening communicates. Having a recess formed in the housing, and the dust collecting cylinder is fitted into the recess,
The recess has a support guide groove for supporting and guiding the dust collection cylinder,
The dust collection mechanism according to claim 1, wherein the dust collection cylinder has an elastically deformable convex portion that fits into the support guide groove at an end portion of a surface facing the concave portion.   The dust collecting mechanism according to claim 2, wherein the convex portion is in contact with one groove end or the other groove end of the support guide groove to limit a moving range of the dust collecting cylinder.   The convex portion abuts on one end of the support guide groove, the intake hole and the second opening communicate with each other, and a dust collection air passage from the first opening to the exhaust hole is passed through the filter. 4. The dust collecting mechanism according to claim 2, wherein the dust collecting mechanism is formed.   The convex portion comes into contact with the other groove end of the support guide groove, the dust guide hole communicates with the third opening, and the dust guide hole passes through the dust guide hole to discharge the dust from the first opening to the exhaust hole. 4. The dust collecting mechanism according to claim 2, wherein an air passage is formed. A dust removal protrusion is provided on the periphery of the second opening;
The dust collection mechanism according to any one of claims 1 to 3, wherein the dust collection cylinder is configured such that the dust removal protrusion comes into contact with the filter. The dust collection cylinder has a rack on a surface facing the housing,
In the housing,
A first drive unit for driving the fan;
A pinion that is peeped outward from the housing and screwed into the rack;
A second drive unit for rotating the pinion;
A control unit for controlling the driving of the first driving unit and the rotation of the second driving unit,
The control unit
The fan is rotated by driving the first driving unit to introduce outside air from the first opening,
2. The filter according to claim 1, wherein the dust collecting cylinder is moved by rotation of the second drive unit, the intake hole and the second opening communicate with each other, and the filter collects dust. The dust collection mechanism as described in any one of thru | or 4.   The control unit moves the dust collection cylinder by rotation of the second drive unit to communicate the dust guide hole with the third opening, and passes the dust guide hole from the exhaust hole to the dust collection hole. The dust collecting mechanism according to claim 7, wherein dust in the cylinder is discharged.   A projection-type image display apparatus comprising the dust collection mechanism according to claim 1. Along with the rotation of the fan, the dust collecting air passage is formed,
The projection type image display device according to claim 9, wherein the dust discharge air passage is formed after projection. The housing has a projection lens;
The projection-type image display device according to claim 9 or 10, wherein the dust collection cylinder has a lens cover integrally shielding and protecting the projection lens. The lens cover is provided with an elastically deformable pin,
12. The projection type image display device according to claim 11, wherein a guide groove for fitting the pin and guiding the pin of the lens cover is provided in the housing.   13. The projection type image display device according to claim 12, wherein the pin abuts against one end of the guide groove or the other end of the guide groove to prohibit the movement of the lens cover. The fan switch is juxtaposed with the projection lens,
The lens cover is
Shielding the projection lens at the end of the groove, and unshielding the switch;
14. The projection type image display device according to claim 11, wherein the projection lens is unshielded at the other groove end and the switch is shielded.   An electronic device comprising the dust collection mechanism according to claim 1.

Images