WO2020059398A1 - Projection device and method for controlling same - Google Patents

Abstract

The present invention provides: a projection device with which it is possible, via a simple structure, to remove dust collected in a filter for preventing entry of dust inside a housing; and a method for controlling the projection device. A projector (100) comprises: a filter rotation mechanism that rotates a filter (72) about a rotation shaft extending in the direction in which air inside a housing (10) is discharged by an intake fan (7); a case (71) in which a flow channel (78) is formed between the filter (72) and the intake fan (7); a flow channel restriction mechanism (76) for switching between a restricting state in which the width in direction Y of the flow channel (78) is partially narrowed to restrict the flow channel (78), and a de-restricting state in which the restricting of the flow channel (78) is removed; and a control unit (5) that controls the flow channel restriction mechanism (76) to the de-restricting state when the intake fan (7) is caused to rotate in the forward direction, and controls the flow channel restriction mechanism (76) to the restricting state and rotates the filter (72) when the intake fan (7) is being caused to rotate in reverse.

Description

Projection apparatus and control method thereof

The present invention relates to a projection device and a control method thereof.

A projector as a projection device includes a light source, a light modulation element that spatially modulates light from the light source, and a power supply circuit and other members that cause a large temperature rise. For this reason, it is common to mount a fan for cooling these members by air.

Patent Document 1 discloses that a housing constituting an exterior, an opening provided in the housing, and outside air are sucked into the housing by a forward rotation operation through the opening, and the inside of the housing is rotated by a reverse rotation operation. There is described a projector that includes a fan that exhausts the air outside the housing, and a filter that is disposed between the opening and the fan and that prevents dust from entering the inside of the housing. This projector is equipped with a mode for removing dust adhering to a filter by a reverse rotation operation of a fan.

Patent Document 2 discloses that by opening a part of a louver disposed between a liquid crystal panel and a cooling fan, the amount of air blown by the fan is increased to remove dust entering a gap between the liquid crystal panels. A projector is described.

In Patent Document 3, a plate-like rotating member is provided between a cooling fan and a heat sink, and the rotating member narrows a flow path between the fan and the heat sink, thereby forming a secondary vortex on the heat sink side. An electronic device that generates dust and removes dust from a heat sink is described.

Japanese Patent Application Laid-Open No. 2008-060108 Japanese Patent Application Laid-Open No. 2002-350806 Japanese Patent Application Laid-Open No. 2010-161196

(4) The dust collection filter provided to face the intake fan serves to prevent dust outside the casing of the projector from entering the inside of the casing when the intake fan is normally rotated. On the other hand, as described in Patent Document 1, when the intake fan is rotated in the reverse direction, dust adhering to the filter can be removed by the wind pressure due to the reverse rotation. However, if the dust is firmly adhered to the filter, the removal of the dust by the wind pressure becomes insufficient.

Therefore, if the technology described in Patent Documents 2 and 3 is applied and the flow path of the air reaching the filter is partially narrowed, it is possible to increase the flow velocity of the air blown to the filter. . However, with the technique described in Patent Document 3, it is difficult to blow air over the entire surface of the filter. Further, as described in Patent Literature 2, when a configuration in which the opening position of the louver is moved is adopted, control of a mechanism for moving the flow path becomes complicated, and the cost increases. Further, since the flow of the air is not constant, the flow velocity may be reduced due to the influence of turbulence or the like.

The present invention has been made in view of the above circumstances, and a projection device and a control thereof that can remove dust captured by a filter for preventing dust from entering the inside of a housing with a simple structure. The aim is to provide a method.

The projection device according to the present invention includes a housing having an opening, and taking air into the housing from the opening in a normal rotation state and air in the housing from the opening in a reverse rotation state. A fan for discharging dust, a filter for capturing dust contained in air taken into the housing by the fan, and a filter for rotating the filter about a rotation axis extending in a direction in which the fan discharges air from the housing. A filter rotating mechanism for causing the air to flow between the filter and the fan; a flow path forming member for forming a flow path for the air; and a member for shutting off the air inserted and held in the flow path. A restriction state in which the width in the direction perpendicular to the rotation axis is partially narrowed to restrict the flow path, and a restriction release state in which the member is retracted from the flow path to release the restriction of the flow path, A flow path restricting mechanism for switching, and in a state where the fan is rotated forward, the flow path restricting mechanism is controlled to the restriction released state, and in a state where the fan is rotated reversely, the flow path is restricted. A control unit that controls the restriction mechanism to the restricted state and rotates the filter by the filter rotation mechanism.

A method of controlling a projection device according to the present invention includes a housing having an opening, and taking air into the housing from the opening in a normal rotation state and from the opening in a reverse rotation state. A fan for discharging air from the body, a filter for capturing dust contained in air taken into the housing by the fan, and a flow forming a flow path of the air between the filter and the fan. A path forming member, wherein the filter is rotated around a rotation axis extending in a direction in which the fan discharges air in the housing when the fan is rotated in the reverse direction. And a member for blocking air is inserted into and held in the flow path, and the width of the flow path in a direction perpendicular to the rotation axis is partially narrowed to restrict the flow path. In the state of being rotated forward, the member is retracted from the flow path in which comprises the step of releasing the restriction of the flow path.

According to the present invention, it is possible to provide a projection device capable of removing dust captured by a filter for preventing dust from entering the inside of a housing with a simple structure, and a control method therefor.

FIG. 1 is a schematic diagram illustrating a schematic configuration of a projector 100 that is an embodiment of a projection device of the present invention. FIG. 2 is a schematic cross-sectional view of a range A in FIG. 1 in a state where the intake fan 7 shown in FIG. 1 is rotating forward. FIG. 2 is a schematic cross-sectional view of a range A of FIG. 1 in a state where the intake fan 7 shown in FIG. 1 is rotating in the reverse direction. FIG. 4 is a schematic diagram of the first unit 70 in the state illustrated in FIG. 3 as viewed in a direction X2. It is a schematic diagram corresponding to FIG. 4 and showing a modification of the flow path restricted by the flow path restriction mechanism. It is a schematic diagram corresponding to FIG. 3 which shows the modification of the flow path restricted by the flow path restriction mechanism. FIG. 7 is a schematic view of the first unit 70 in the state shown in FIG. 6 when viewed in a direction X2. FIG. 2 is a schematic diagram showing a schematic configuration of a projector 100A which is a modification of the projector 100 shown in FIG. FIG. 9 is a schematic sectional view of a range C in FIG. 8 in a state where the exhaust fan 8A shown in FIG. 8 is rotating in the reverse direction. FIG. 9 is a schematic cross-sectional view of a range C in FIG. 8 in a state where the exhaust fan 8A illustrated in FIG. 8 is rotating forward.

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

FIG. 1 is a schematic diagram showing a schematic configuration of a projector 100 which is an embodiment of the projection device of the present invention. The projector 100 includes a housing 10 made of metal or resin, and a light source unit 2, a light modulation element 3, a projection optical system 4, a control unit 5, an intake fan 7, an intake fan 7 provided inside the housing 10. The first unit 70 and the exhaust fan 8 are provided adjacent to each other.

The light source unit 2 includes a light source 21 that emits white light, a color wheel 22, and an illumination optical system 23. The light source 21 is configured to include a light emitting element such as a laser or an LED (Light Emitting Diode). The color wheel 22 is disposed between the light source 21 and the illumination optical system 23. The color wheel 22 is a disk-shaped member, and provided along its circumferential direction are an R filter that transmits red light, a G filter that transmits green light, and a B filter that transmits blue light. The color wheel 22 is rotated around an axis, and splits white light emitted from the light source 21 into red light, green light, and blue light in a time-sharing manner and guides the white light to the illumination optical system 23. Light emitted from the illumination optical system 23 enters the light modulation element 3.

The light modulation element 3 spatially modulates the light emitted from the illumination optical system 23 based on the image data, and emits the spatially modulated light to the projection optical system 4.

The projector 100 shown in FIG. 1 is an example in which a DMD (Digital Micromirror Device) is used as the light modulation element 3, but the light modulation element 3 is, for example, LCOS (Liquid Crystal on Silicon) or MEMS (Micro Electro Mechanical Systems). It is also possible to use an element, a liquid crystal display element, or the like.

The projection optical system 4 receives the light from the light modulation element 3 and includes at least one lens. Light that has passed through the projection optical system 4 is projected on a screen (not shown) through an opening provided in the housing 10.

(4) The intake fan 7 is provided at a position facing the intake port 10A formed by the opening formed in the housing 10. The rotation direction of the intake fan 7 can be switched between forward and reverse. In a state where the intake fan 7 is rotated in one direction (forward rotation), air is taken into the housing 10 from the intake port 10A via the first unit 70 described later, and In the state of being rotated (reverse rotation), the air in the housing 10 is discharged from the air inlet 10A via the first unit 70.

The air taken into the casing 10 by the forward rotation of the intake fan 7 is blown against a member to be cooled such as the light source 21, the light modulation element 3, or a power supply circuit (not shown) to cool them. . The intake fan 7 is controlled by the control unit 5. In the projector 100, the intake port 10A constitutes an opening, and the intake fan 7 constitutes a fan.

The first unit 70 is provided between the intake fan 7 and the intake port 10 </ b> A, and is provided to capture dust contained in air taken into the housing 10 by the intake fan 7 and remove the dust. Have been.

The exhaust fan 8 is provided at a position facing the exhaust port 10B formed by the opening formed in the housing 10, and discharges the air in the housing 10 from the exhaust port 10B. The exhaust fan 8 is controlled by the control unit 5. A filter (not shown) is fitted to the exhaust port 10B, and the filter prevents dust from entering the housing 10 from the exhaust port 10B.

The control unit 5 performs control of the light source unit 2, control of the light modulation element 3, control of the intake fan 7, control of the first unit 70, control of the exhaust fan 8, and the like, and includes a processor and a ROM (Read). Only @ Memory) and RAM (Random @ Access @ Memory).

As the processor, a programmable logic device (CPU) (Central Processing Unit), which is a general-purpose processor for executing various processes by executing a program, or a processor capable of changing a circuit configuration after manufacturing, such as an FPGA (Field Programmable Gate Array). A dedicated electric circuit, which is a processor having a circuit configuration specifically designed to execute a specific process such as Programmable Logic Device (PLD) or ASIC (Application Specific Integrated Circuit), is included.

The structure of these processors is more specifically an electric circuit combining circuit elements such as semiconductor elements.

The processor of the control unit 5 may be configured by one of the above-described various processors, or a combination of two or more processors of the same type or different types (for example, a combination of a plurality of FPGAs or a combination of a CPU and an FPGA). ).

FIG. 2 is a schematic cross-sectional view of a range A in FIG. 1 in a state where the intake fan 7 shown in FIG. 1 is rotating forward. FIG. 3 is a schematic sectional view of a range A in FIG. 1 in a state where the intake fan 7 shown in FIG. 1 is rotating in the reverse direction. FIG. 4 is a schematic view of the first unit 70 in the state shown in FIG. 3 as viewed in a direction X2.

The direction X2 shown in FIGS. 2 and 3 is the direction of suction of the air W1 into the housing 10 when the intake fan 7 is rotating forward. The direction X1 shown in FIGS. 2 and 3 is a direction in which the air W2 is discharged from the housing 10 when the intake fan 7 is rotating in the reverse direction, and is opposite to the direction X2. Hereinafter, the directions X1 and X2 are collectively referred to as a direction X, and a direction orthogonal to the direction X is referred to as a direction Y.

As shown in FIGS. 2 and 3, the first unit 70 includes a cylindrical case 71, a filter 72, a filter frame 73, a rotating shaft 74, a motor 75, and a flow path provided on an inner peripheral portion of the case 71. A limiting mechanism 76.

The case 71 has an opening 71a facing the intake port 10A at an end on the intake port 10A side, and has an opening 71b facing the intake fan 7 at an end on the intake fan 7 side. In the example of the present embodiment, as shown in FIG. 4, the case 71 is a tubular member having a rectangular outer diameter and an inner peripheral portion having a square pole shape.

The filter frame 73 is a flat plate-shaped member fitted to an end of the inner periphery of the case 71 on the side of the opening 71a, and has a columnar opening for providing the filter 72 at the center thereof. I have.

The filter 72 is for catching dust contained in the air W1 taken in from the intake port 10A when the intake fan 7 is rotating forward, and has a disk-like and mesh-like shape. The filter 72 is located inside the above-described opening of the filter frame 73 and is supported by the filter frame 73 so as to be slidable with respect to the inner peripheral surface of the filter frame 73.

The rotating shaft 74 is a rod-shaped member fixed in the center of the filter 72 and extending in the direction X. The motor 75 is an actuator that drives the rotation shaft 74. The motor 75 is controlled by the control unit 5. The control section 5 rotates the filter 72 around the rotation shaft 74 by rotating the rotation shaft 74 by the motor 75. The rotating shaft 74 and the motor 75 constitute a filter rotating mechanism.

The flow path restriction mechanism 76 includes a rotation shaft 76b extending in a direction perpendicular to the direction X and the direction Y, and a member that shuts off air and is supported by the rotation shaft 76b so as to be rotatable about the rotation shaft 76b. It includes a plate-shaped movable member 76a and a driving unit such as a motor (not shown) for driving the rotating shaft 76b. This drive unit is controlled by the control unit 5.

The rotation shaft 76b is provided on one end surface in the direction Y of the inner peripheral portion of the case 71. As shown in FIG. 2, the movable member 76 a is in contact with one end face in the direction Y of the inner peripheral portion of the case 71, and as shown in FIG. It moves away from the end face to a position closer to the other end face in the direction Y of this inner peripheral portion.

In the state shown in FIG. 2, a portion of the inner peripheral portion of the case 71 closer to the intake fan 7 than the filter 72 except for the movable member 76 a and the rotating shaft 76 b constitutes a flow path 78 through which air flows. . The case 71 forms a flow path forming member that forms the flow path 78.

The flow path restriction mechanism 76 is a mechanism for switching between a restriction state and a restriction release state. The restricted state is a state in which the movable member 76a is inserted and held in the flow channel 78 and the width of the flow channel 78 in the direction Y is partially narrowed, as shown in FIG. As shown in FIG. 2, the restriction release state is a state in which the movable member 76a is retracted from the flow path 78 and the state in which the width of the flow path 78 in the direction Y is partially reduced (restriction of the flow path 78) is released It is in a state to do.

As shown in FIG. 4, when the flow path restriction mechanism 76 is controlled to be in the restricted state, a portion 78 A of the flow path 78 whose width is narrowed by the movable member 76 a when viewed from the direction X, A straight line L passing through the center of the filter 72 and extending in a direction perpendicular to the direction Y and an overlapping portion of the filter 72 are in an overlapping state. Specifically, in the example of FIG. 4, the width of the flow channel 78 is limited to about half by the movable member 76 a, and the limited portion 78 </ b> A overlaps with half of the filter 72.

The projector 100 configured as described above is provided with a cleaning mode for removing dust captured by the filter 72 of the first unit 70, in addition to a projection mode for projecting an image on a screen. This cleaning mode can be automatically started, for example, when an operation of turning off the power of the projector 100 is performed, or can be manually started.

In the projection mode, as shown in FIG. 2, the control unit 5 rotates the intake fan 7 forward, controls the flow path restriction mechanism 76 to the restriction release state, and controls the filter 72 to the non-rotation state. .

With these controls, when the intake fan 7 is rotating forward, the air W1 taken in from the intake port 10A passes through the filter 72, passes through the flow path 78 having a substantially constant width, and Flows into the interior of. In the projection mode, the dust contained in the air W1 is captured by the filter 72, so that entry into the housing 10 is prevented.

(3) In the cleaning mode, the control unit 5 rotates the intake fan 7 in the reverse direction, controls the flow path restriction mechanism 76 to the restricted state, and rotates the filter 72, as shown in FIG.

With these controls, in a state where the intake fan 7 is rotated in the reverse direction, the air W2 inside the housing 10 increases after the flow velocity increases in the portion of the flow path 78 whose width is reduced by the movable member 76a. , To the filter 72.

部分 As shown in FIG. 4, the portion of the surface of the filter 72 to which the air W2 is blown is limited to a substantially lower half area of the filter 72. However, in this state, since the filter 72 is rotated, the rotating operation causes the air W2 having the increased flow velocity to be blown onto the entire surface of the filter 72. By the air W2, the dust trapped on the surface of the filter 72 on the intake port 10A side in the projection mode is blown off in the direction X1 and removed.

When a predetermined time has elapsed since the start of the cleaning mode, the control unit 5 stops the intake fan 7, controls the flow path restriction mechanism 76 to the restriction release state, and controls the filter 72 to the non-rotation state. Then, the cleaning mode ends.

As described above, according to the projector 100, in the cleaning mode, the air W2 in the housing 10 is blown against the rotating filter 72 in a state where the flow velocity is increased. Thus, the dust captured by the filter 72 in the projection mode can be effectively removed by the high-speed air W2, and the filter 72 can be prevented from being clogged. Further, according to the configuration of the first unit 70, the high-speed air W2 can be blown onto the entire surface of the filter 72 with a simple configuration, so that the manufacturing cost of the projector 100 can be reduced. Further, according to the configuration of the first unit 70, the flow path of the air W2 is constant, so that the flow of the air W2 can be stabilized.

When the movable member 76a restricts the width of the flow path 78 in the restricted state, the width of the restricted portion 78A in the direction Y is not limited to that shown in FIG. For example, as shown in FIG. 5, the width of the portion 78A in the direction Y may be smaller than that of FIG.

In the configuration shown in FIG. 5, the restricted portion 78A of the flow path 78 does not overlap with the overlapping portion of the straight line L and the filter 72. For this reason, even when the filter 72 is rotating, it is difficult for the high-speed air W2 to be blown onto the entire surface of the filter 72. Specifically, a strong wind hardly hits the vicinity of the rotation shaft 74 in the filter 72. However, even with this configuration, a strong wind can be blown to most of the surface of the filter 72. Therefore, it is possible to obtain an effect of removing dust adhering to the filter 72.

In the examples of FIGS. 2 and 3, the restriction and the release of the flow path 78 are performed by one movable member 76 a. However, as shown in FIG. It is also possible to adopt a configuration in which two channels are provided and the flow path 78 is narrowed by two movable members 76a.

FIG. 7 is a view showing a state where the first unit 70 of the modification shown in FIG. 6 is viewed in the direction X2. As shown in FIG. 7, even when two flow path restriction mechanisms 76 are provided, a portion 78 A of the flow path 78 whose width is narrowest by two movable members 76 a and a straight line L in the filter 72 The overlapping part is configured to overlap. With this configuration, it is possible to obtain a state in which this portion 78A and the entire surface of the filter 72 overlap with each other by the rotation of the filter 72, and it is possible to blow high-speed air onto the entire surface of the filter 72.

The control unit 5 of the projector 100 may perform control to rotate the filter 72 of the first unit 70 continuously or intermittently in the projection mode. Thus, even in the projection mode, the rotation of the filter 72 allows the air W1 taken in from the air inlet 10A to be uniformly blown to the entire surface of the filter 72. This can prevent the filter 72 from being unevenly clogged.

FIG. 8 is a schematic diagram showing a schematic configuration of a projector 100A which is a modification of the projector 100 shown in FIG. The projector 100A is different from the projector 100 in that the exhaust fan 8 is changed to the exhaust fan 8A, and that the second unit 80 having the same structure as the first unit 70 is provided between the exhaust port 10B and the exhaust fan 8A. Has the same configuration as the projector 100.

The exhaust fan 8A is provided at a position facing the exhaust port 10B. The exhaust fan 8A can switch its rotation direction between forward and reverse. When the exhaust fan 8A is rotated in one direction (forward rotation), the exhaust fan 8A takes in air into the housing 10 from the exhaust port 10B via the second unit 80, and rotates in the opposite direction to the one direction ( In a state where the housing 10 is rotated in the reverse direction, the air in the housing 10 is exhausted from the exhaust port 10B via the second unit 80.

In the projector 100A, the inlet 10A forms a first opening, and the outlet 10B forms a second opening. In projector 100A, filter 72 of first unit 70 forms an intake filter, and filter 72 of second unit 80 forms an exhaust filter. The filter 72 of the second unit 80 is provided to capture dust contained in the air taken in from the exhaust port 10B.

The control unit 5 of the projector 100A rotates the exhaust fan 8A in the reverse mode in the projection mode, and rotates the exhaust fan 8A in the normal mode in the cleaning mode.

FIG. 9 is a schematic cross-sectional view of a range C in FIG. 8 in a state where the exhaust fan 8A shown in FIG. 8 is rotating in the reverse direction. FIG. 10 is a schematic sectional view of a range C in FIG. 8 in a state where the exhaust fan 8A shown in FIG. 8 is rotating forward.

FIG. 9 shows that the intake port 10A is changed to the exhaust port 10B, the intake fan 7 is changed to the exhaust fan 8A, the first unit 70 is changed to the second unit 80 having the same structure, and the air W2 is changed to the air W1. It is the same as FIG. 3 except for the changes.

FIG. 10 shows that the intake port 10A is changed to the exhaust port 10B, the intake fan 7 is changed to the exhaust fan 8A, the first unit 70 is changed to the second unit 80 having the same structure, and the air W1 is changed to the air W2. It is the same as FIG. 3 except for the changes.

In the projection mode, the control unit 5 of the projector 100A reversely rotates the exhaust fan 8A to control the flow path restriction mechanism 76 of the second unit 80 to the restricted state, as shown in FIG. The filter 72 of 80 is rotated. In the cleaning mode, the control unit 5 of the projector 100A rotates the exhaust fan 8A in the forward direction to control the flow path restriction mechanism 76 of the second unit 80 to the restriction release state, as shown in FIG. The filter 72 of the unit 80 is controlled so as not to rotate.

In the projector 100A having the above configuration, in the projection mode, the intake fan 7 rotates forward to take in the air W1 into the housing 10 via the first unit 70, and cool the member to be cooled by the air W1. In the projection mode, the exhaust fan 8A rotates in the reverse direction, and the air W1 introduced into the housing 10 by the normal rotation of the intake fan 7 has a width caused by the movable member 76a of the second unit 80, as shown in FIG. Is blown against the filter 72 of the second unit 80 through the narrowed flow path 78, and is discharged from the exhaust port 10B.

Further, in the projector 100A, in the cleaning mode, the exhaust fan 8A rotates forward, and the air W2 is discharged from the exhaust port 10B into the housing 10 through the flow path 78 of the second unit 80 as shown in FIG. Take in. Further, in the cleaning mode, the air W2 introduced into the housing 10 by the reverse rotation of the intake fan 7 and the forward rotation of the exhaust fan 8A is swept by the movable member 76a of the first unit 70 as shown in FIG. Is blown against the filter 72 of the first unit 70 through the narrowed flow path 78, and is discharged from the intake port 10A.

By providing the second unit 80 between the exhaust port 10B and the exhaust fan 8A in this manner, the housing is in a state where the intake fan 7 is rotating forward (a state in which the exhaust fan 8A is rotating reversely). The air W <b> 1 taken in the inside 10 can be discharged smoothly, and the dust adhering to the filter 72 of the second unit 80 can be blown out and removed.

In the state where the intake fan 7 is rotating in the reverse direction (the state where the exhaust fan 8A is rotating forward), the air W2 taken in from the exhaust port 10B always passes through the filter 72 of the second unit 80. Therefore, it is possible to prevent dust from entering the housing 10 from the exhaust port 10B.

In addition, when the exhaust fan 8A is rotating forward, the width of the flow path 78 of the second unit 80 is maximized as shown in FIG. For this reason, the amount of air required for cleaning the filter 72 of the first unit 70 can be sufficiently taken in the housing 10.

The control unit 5 of the projector 100A rotates the filter 72 of the first unit 70 continuously or intermittently in the projection mode, and rotates the filter 72 of the second unit 80 continuously or intermittently in the cleaning mode. May be performed.

時 に By rotating the filter 72 of the first unit 70 in the projection mode, the air W1 taken in from the air inlet 10A can be uniformly blown to the entire surface of the filter 72 of the first unit 70. Thereby, it is possible to prevent the filter 72 of the first unit 70 from being unevenly clogged.

In addition, when the filter 72 of the second unit 80 rotates in the cleaning mode, the air W2 taken in from the exhaust port 10B can be uniformly blown to the entire surface of the filter 72 of the second unit 80. Thereby, it is possible to prevent the filter 72 of the second unit 80 from being unevenly clogged.

The configuration of the flow path restriction mechanism 76 in each of the first unit 70 and the second unit 80 described above is an example, and various modifications are possible. For example, a configuration may be adopted in which a state in which the flow path 78 is restricted and a state in which the restriction is released are switched by expanding and contracting a bellows-shaped member fixed to one surface of the case 71 in the direction Y. Further, a throttle mechanism may be provided between the filter 72 and the fan, and the state in which the flow path is restricted by the throttle mechanism and the state in which the restriction is released may be switched.

As described above, the following items are disclosed in this specification.

(1)
A housing having an opening;
A fan that takes in air into the housing from the opening in the forward rotation state and discharges air in the housing from the opening in the reverse rotation state.
A filter for capturing dust contained in air taken into the housing by the fan,
A filter rotation mechanism that rotates the filter around a rotation axis that extends in a direction in which air is discharged from the housing by the fan;
A flow path forming member that forms a flow path of the air between the filter and the fan,
Inserting and holding a member that blocks air in the flow path, holding the member, restricting the flow path by partially narrowing the width of the flow path in a direction perpendicular to the rotation axis, A flow path restriction mechanism for switching between a restriction release state of retreating from the flow path and releasing the restriction of the flow path,
When the fan is rotating forward, the flow path restriction mechanism is controlled to the restriction release state, and when the fan is rotating reversely, the flow path restriction mechanism is controlled to the restriction state. And a control unit for rotating the filter by the filter rotation mechanism.

(2)
(1) The projection device according to (1),
The narrowed portion of the flow path in the restricted state, when viewed from the discharge direction, extends in a direction perpendicular to the rotation axis and overlaps a straight line passing through the rotation axis with the filter. At least overlapping projection devices.

(3)
The projection device according to (1) or (2),
The control device, wherein the control unit further rotates the filter while the fan is rotating forward.

(4)
The projection device according to any one of (1) to (3),
The opening includes a first opening and a second opening,
The fan is an intake fan that is normally rotated in a projection mode for projecting an image, and is reversely rotated in a cleaning mode for removing dust, and the fan is rotated from the first opening in a normally rotated state. An intake fan that takes in air into the housing and discharges the air in the housing from the first opening when the air is rotated in the reverse direction, and an exhaust fan that is rotated in the reverse direction in the projection mode and rotated forward in the cleaning mode A fan that exhausts air from the housing through the second opening when the fan is rotated in the reverse direction, and takes air into the housing through the second opening when the fan is rotated in the normal direction. Including a fan,
The filter includes an intake filter for capturing dust contained in air taken into the housing from the first opening by the intake fan, and is taken into the housing from the second opening by the exhaust fan. An exhaust filter for trapping dust contained in air,
A first unit provided adjacent to the first opening,
A second unit provided adjacent to the second opening,
The first unit includes the fan as the intake fan, the filter as the intake filter, the opening as the first opening, the filter rotation mechanism, the flow path forming member, and the flow path restriction. Has a mechanism,
The second unit, wherein the fan is the exhaust fan, the filter is the exhaust filter, and the opening is the second opening, the filter rotating mechanism, the flow path forming member, and the flow path restriction. A projection device having a mechanism.

(5)
A housing having an opening, a fan that takes air into the housing from the opening in a normally rotated state, and discharges air in the housing from the opening in a rotated state, A projection device, comprising: a filter for capturing dust contained in air taken into the housing by a fan; and a flow path forming member that forms a flow path of the air between the filter and the fan. A control method,
In a state where the fan is rotated in the reverse direction, the filter is rotated around a rotation axis extending in a direction in which the fan discharges air from the housing, and a member that blocks air is inserted into the flow path. And restricting the flow path by partially reducing the width of the flow path in a direction perpendicular to the rotation axis, and keeping the member in the flow path in a state where the fan is normally rotated. A method for controlling a projection apparatus, comprising the step of retracting the flow path and releasing the restriction on the flow path.

(6)
(5) The control method of the projection device according to (5),
In the above-mentioned step, a control method of a projection device for further rotating the filter while the fan is rotating forward.

Although various embodiments have been described with reference to the drawings, it is needless to say that the present invention is not limited to such examples. It is clear that those skilled in the art can conceive various changes or modifications within the scope of the claims, and these naturally belong to the technical scope of the present invention. I understand. Further, each component in the above embodiment may be arbitrarily combined without departing from the spirit of the invention.

This application is based on a Japanese patent application filed on Sep. 19, 2018 (Japanese Patent Application No. 2018-175130), the contents of which are incorporated herein by reference.

The present invention is highly convenient and effective when applied to a liquid crystal projector or the like.

100, 100A Projector 2 Light source unit 21 Light source 22 Color wheel 23 Illumination optical system 3 Light modulation element 4 Projection optical system 5 Control unit 7 Intake fan 70 First unit 71 Cases 71a, 71b Opening 72 Filter 73 Filter frame 74 Rotating shaft 75 Motor 76 flow path restriction mechanism 76a movable member 76b rotating shaft 78 flow path 78A restricted parts of flow path W1, W2 air 8, 8A exhaust fan 80 second unit 10 housing 10A intake port 10B exhaust port A, C range

Claims (6)

A housing having an opening;
A fan that takes in air from the opening into the housing in a state of normal rotation, and discharges air in the housing from the opening in a state of reverse rotation,
A filter for capturing dust contained in air taken into the housing by the fan,
A filter rotation mechanism that rotates the filter around a rotation axis that extends in a direction in which air is discharged from the housing by the fan;
A flow path forming member that forms a flow path of the air between the filter and the fan;
A member that blocks air is inserted into and held in the flow channel, and the width of the flow channel in a direction perpendicular to the rotation axis is partially narrowed to restrict the flow channel; A flow path restriction mechanism for switching between a restriction release state of retreating from the flow path and releasing the restriction of the flow path,
When the fan is rotating forward, the flow path restriction mechanism is controlled to the restriction release state, and when the fan is rotating reversely, the flow path restriction mechanism is controlled to the restriction state. A control unit configured to rotate the filter by the filter rotation mechanism. The projection device according to claim 1,
The narrowed portion of the flow path in the restricted state, when viewed from the discharge direction, extends in a direction perpendicular to the rotation axis and overlaps a straight line passing through the rotation axis with the filter. At least overlapping projection devices. The projection device according to claim 1 or 2,
The projection device, wherein the control unit further rotates the filter while the fan is normally rotating. The projection device according to claim 1, wherein:
The opening includes a first opening and a second opening,
The fan is an intake fan that is normally rotated in a projection mode for projecting an image, and is reversely rotated in a cleaning mode for removing dust, and the fan is rotated from the first opening in a normally rotated state. An intake fan that takes in air into the housing and discharges the air in the housing from the first opening when the air is rotated in the reverse direction, and exhaust air that is rotated in the projection mode in the reverse direction and is rotated in the cleaning mode in the normal direction. A fan that exhausts the air in the housing from the second opening when the fan is rotated in the reverse direction, and takes in the air from the second opening into the housing when the fan is rotated in the normal direction. Including a fan,
The filter includes an intake filter for capturing dust contained in air taken into the housing from the first opening by the intake fan, and is taken into the housing from the second opening by the exhaust fan. An exhaust filter for trapping dust contained in air,
A first unit provided adjacent to the first opening,
A second unit provided adjacent to the second opening,
The first unit includes the filter as the intake fan, the filter as the intake filter, the opening as the first opening, the filter rotation mechanism, the flow path forming member, and the flow path restriction. Has a mechanism,
The filter rotation mechanism, the flow path forming member, and the flow path restriction, wherein the second unit includes the fan as the exhaust fan, the filter as the exhaust filter, and the opening as the second opening. A projection device having a mechanism. A housing having an opening, a fan that takes in air into the housing from the opening in a normally rotated state, and discharges air in the housing from the opening in a reversely rotated state, A projection device, comprising: a filter for capturing dust contained in air taken into the housing by a fan; and a flow path forming member that forms a flow path of the air between the filter and the fan. A control method,
In a state where the fan is rotated in the reverse direction, a member that rotates the filter around a rotation axis that extends in a direction in which the fan discharges air in the housing and inserts a member that blocks air into the flow path. And restricting the flow path by partially reducing the width of the flow path in a direction perpendicular to the rotation axis, and in a state where the fan is normally rotated, the member is moved inside the flow path. A control method for the projection apparatus, comprising the step of retracting the flow path and releasing the restriction on the flow path. The control method of the projection device according to claim 5, wherein
In the step, a control method of a projection device that further rotates the filter while the fan is rotating forward.

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