WO2020045083A1

WO2020045083A1 - Projection device and control method therefor

Info

Publication number: WO2020045083A1
Application number: PCT/JP2019/031879
Authority: WO
Inventors: 藤村　有一; 亮今井; 泰斗黒田; 慶洋里舘
Original assignee: 富士フイルム株式会社
Priority date: 2018-08-31
Filing date: 2019-08-13
Publication date: 2020-03-05
Also published as: JP6877652B2; JPWO2020045083A1

Abstract

The present invention provides a projection device capable of preventing dust from adhering to members inside a housing, and a control method therefor. A projector 100 is provided with: a suction fan 7 which takes in air from a suction port 10A during normal rotation, and discharges air from the suction port 10A during reverse rotation; a first flow channel CH1 which connects the suction port 10A and the inside of a housing 10; a filter 73 which is provided in the first flow channel CH1; a second flow channel CH2 which connects a portion on the suction port 10A side from the filter 73 in the first flow channel CH1 and the inside of the housing 10; a flow channel switching mechanism 75 which separates the first flow channel CH1 and the second flow channel CH2 during the normal rotation of the suction fan 7, and causes the first flow channel CH1 and the second flow channel CH2 to communicate with each other during the reverse rotation of the suction fan 7; and a backflow prevention part 74 which causes air that has passed through the filter 73 to flow into the housing 10 during the normal rotation of the suction fan 7, and prevents air from flowing into the filter 73 from the inside of the housing 10 during the reverse rotation of the suction fan 7.

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 has a light source, a light modulation element that spatially modulates light from the light source, and a member having a large temperature rise such as a power supply circuit, so that a fan for cooling these members with air is mounted. Is common.

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. A projector is described that includes a fan that exhausts the air outside the electronic device, and a filter that is disposed between the opening and the fan and that prevents dust from entering the inside of the housing.

Patent Literature 2 discloses an external air introduction fan that cools a light source housed in a housing, a duct that blows air to the light source through a metal mesh, and a partition plate having a metal mesh structure that can be opened and closed in the duct. When the light source is turned off, the outside air introduction fan reversely rotates to blow back air to the duct to open the partition plate, remove dust adhering to the metal mesh, and collect it in the dust box. A configured projector is described.

Japanese Patent Application Laid-Open No. 2008-060108 Japanese Patent Application Laid-Open No. 2008-122538

(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 Documents 1 and 2, when the intake fan is rotated in the reverse direction, dust adhering to the filter can be removed by the wind pressure caused by the reverse rotation. However, when the intake fan is rotated in the reverse direction, if dust is present inside the housing, the dust may adhere to the filter. When the intake fan rotates forward, the dust returns to the inside of the housing. Therefore, there is a problem that it is difficult to remove dust that has entered the inside of the housing. Patent Documents 1 and 2 do not describe such a problem and means for solving the problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a projection device that can prevent dust from adhering to members inside a housing and a control method thereof.

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. And a first channel connecting the opening and the inside of the housing, a filter provided for the first channel, for capturing dust, and a filter for the first channel. A portion on the opening side, a second flow path connecting the inside of the housing, and in a state where the fan is normally rotated, shields a boundary between the first flow path and the second flow path. A flow path switching mechanism that divides the first flow path and the second flow path and allows the first flow path and the second flow path to communicate with each other when the fan is rotated in the reverse direction; Pass the above filter when Air was introduced into the above housing, in which and a backflow prevention unit to prevent the inflow of air from the interior of the housing into the filter in a state where the fan is reversely rotated.

The control method of the projection device according to the aspect of the invention includes a housing having an opening, and taking air into the housing from the opening in a state where the housing is rotated forward and from the opening in a state where the housing is rotated backward. A projection device, comprising: a fan that discharges air in the housing, a first flow path that connects the opening and the inside of the housing, and a filter that is provided in the first flow path and that captures dust. In the control method of the above, in a state where the fan is rotated forward, the first flow path, the first flow path connecting the portion of the first flow path closer to the opening than the filter and the inside of the housing. The first flow path and the second flow path are separated by blocking a boundary between the two flow paths, and the first flow path and the second flow path are communicated with each other when the fan is rotated in the reverse direction. Flow path switching step, and the fan When the fan is rotated, the air that has passed through the filter flows into the housing, and when the fan is rotated in the reverse direction, the air flows from the housing to the filter to prevent air from flowing into the filter. And a prevention step.

According to the present invention, it is possible to provide a projection device capable of preventing dust from adhering to a member inside a housing and a control method thereof.

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. 3 is a schematic cross-sectional view showing a schematic configuration of a first unit 70A which is a modification of the first unit 70 in the projector 100 shown in FIG. FIG. 3 is a schematic cross-sectional view showing a schematic configuration of a first unit 70B which is a modification of the first unit 70 in the projector 100 shown in FIG. FIG. 3 is a schematic cross-sectional view showing a schematic configuration of a first unit 70B which is a modification of the first unit 70 in the projector 100 shown in FIG. 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. 8 is a schematic cross-sectional view of a range C in FIG. 7 in a state where the exhaust fan 8A illustrated in FIG. 7 is rotating forward. FIG. 8 is a schematic cross-sectional view of a range C of FIG. 7 in a state where the exhaust fan 8A illustrated in FIG. 7 is rotating in the reverse direction.

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, resin, or the like, and a light source unit 2, a light modulation element 3, a projection optical system 4, a system control unit 5, an intake fan 7, A unit 70 and an exhaust fan 8 are provided.

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 system 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 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 system 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 system 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. 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 system control unit 5 may be configured by one of the various processors described above, 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). Combination).

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.

The projector 100 is assumed to be used in a posture in which the direction Y1 shown in FIGS. 2 and 3 is a vertical direction. The direction Y2 shown in FIGS. 2 and 3 is a direction opposite to the vertical direction. The direction X2 shown in FIGS. 2 and 3 is the direction of suction of the air W1 into the housing 10 in a state where 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. The direction Y1 is orthogonal to the direction X1. Hereinafter, the directions Y1 and Y2 are collectively referred to as a direction Y, and the directions X1 and X2 are also referred to as a direction X.

As shown in FIGS. 2 and 3, the first unit 70 includes a cylindrical case 71, a fixed wall 72 provided on an inner peripheral portion of the case 71, a filter 73, a backflow prevention unit 74, and a flow path switching mechanism. 75.

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.

The fixed wall 72 is provided so as to divide the half of the hollow portion of the case 71 on the intake fan 7 side into two in the direction Y. The portion on the direction Y2 side of the portion divided by the fixed wall 72 is called an upper divided portion, and the portion on the direction Y1 side of the portion divided by the fixed wall 72 is called a lower divided portion.

The filter 73 has a flat plate shape and a mesh shape, and is arranged so as to close the upper divided portion from the opening 71a side. Filter 73 captures dust contained in air W1 taken in from intake port 10A when intake fan 7 is rotating forward.

The flow path switching mechanism 75 includes a rotating shaft 75b extending in a direction perpendicular to the direction X and the direction Y, a flat movable member 75a rotatably supported on the rotating shaft 75b about the rotating shaft 75b, and a rotating shaft. 75b for driving the motor 75b. This drive unit is controlled by the system control unit 5.

As shown in FIG. 2, when the intake fan 7 is rotating forward, the movable member 75 a is configured such that the air W1 flows only into the upper divided portion of the upper divided portion and the lower divided portion. The case 71 is moved to a first position that closes the gap between the divided portion and the opening 71 a to form a first channel CH1 in the hollow portion of the case 71. The first flow channel CH1 is configured by a region surrounded by the surface of the fixed wall 72 on the direction Y2 side, the surface of the movable member 75a on the direction Y2, the rotation shaft 75b, and the inner peripheral surface of the case 71.

部分 A portion of the hollow portion of the case 71 other than the first channel CH1 is a second channel CH2. The second flow channel CH2 is a flow channel that connects a portion of the first flow channel CH1 closer to the intake port 10A than the filter 73 and the inside of the housing 10 (a portion where the intake fan 7 is arranged). The first position described above is a position where the boundary B (see FIG. 3) between the first flow channel CH1 and the second flow channel CH2 is shielded and the first flow channel CH1 and the second flow channel CH2 are separated.

As shown in FIG. 3, the movable member 75a opens the boundary B between the first flow channel CH1 and the second flow channel CH2 and opens the first flow channel CH1 and the second flow channel CH2 when the intake fan 7 is rotated in the reverse direction. It moves to the second position (see FIG. 3) for communicating with the channel CH2.

As shown in FIG. 3, the second channel CH 2 has a configuration in which the end (the surface 75 s of the movable member 75 a) on the intake port 10 A side is inclined with respect to the boundary B.

The backflow prevention section 74 is shown in FIG. 3 where the flow path between the filter 73 and the opening 71b of the case 71 in the first flow path CH1 is shut off (closed), and FIG. 2 which opens this flow path. A shutter member 74a, which is a member movable between the positions, and a motor 74b, which is a drive unit for driving the shutter member 74a, are provided. The motor 74b is controlled by the system control unit 5.

As shown in FIG. 2, the shutter member 74a opens the flow path between the filter 73 and the opening 71b in the first flow path CH1 (hereinafter, open) when the intake fan 7 is rotating forward. (Referred to as “position”), and the air W 1 that is taken in from the intake port 10 A and passes through the filter 73 flows into the housing 10 through the opening 71 b of the case 71.

As shown in FIG. 3, when the intake fan 7 is rotated in the reverse direction, the shutter member 74a blocks the first flow channel CH1 between the filter 73 and the opening 71b (hereinafter referred to as a “block”). (Referred to as a position) to prevent the air W2 from the inside of the housing 10 from flowing into the surface of the filter 73 on the opening 71b side.

The projector 100 configured as described above is provided with a cleaning mode for removing dust captured by the filter 73 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 system control unit 5 drives the intake fan 7 to rotate forward, controls the motor 74b to move the shutter member 74a to the open position, and drives the rotation shaft 75b. To move the movable member 75a to the first position.

With these controls, when the intake fan 7 is rotating forward, the air W1 taken in from the intake port 10A and flowing into the opening 71a of the case 71 passes through the filter 73 and passes through the opening 71b of the case 71. It flows into the inside of the housing 10. In the projection mode, the dust contained in the air W1 is captured by the filter 73, so that entry into the housing 10 is prevented.

In the cleaning mode, as shown in FIG. 3, the system controller 5 rotates the intake fan 7 in the reverse direction, controls the motor 74b to move the shutter member 74a to the shut-off position, and drives the rotating shaft 75b. To move the movable member 75a to the second position.

By these controls, when the intake fan 7 is rotated in the reverse direction, the air W2 inside the casing 10 does not flow into the surface of the filter 73 on the opening 71b side (the inside of the casing 10). The air W2 passes from the second flow channel CH2 to the first flow channel CH1, and is discharged from the intake port 10A. Further, due to the flow of the air W2, the dust trapped on the surface of the filter 73 on the side of the intake port 10A in the projection mode is blown off in the direction X1 and removed.

Here, assuming that the air W2 contains dust, in the cleaning mode, the inflow of the air W2 to the surface of the filter 73 on the opening 71b side is prevented. Therefore, the dust does not adhere to the surface of the filter 73 on the opening 71b side. Therefore, in the projection mode, it is possible to prevent dust existing inside the housing 10 from returning to the housing 10.

When the predetermined time has elapsed since the start of the cleaning mode, the system control unit 5 stops the intake fan 7, moves the movable member 75a to the first position, and ends the cleaning mode. This prevents dust from entering the inside of the housing 10 from the air inlet 10A after the end of the cleaning mode.

As described above, according to the projector 100, in the cleaning mode, the air W2 inside the housing 10 is discharged from the second flow channel CH2 through the first flow channel CH1, and is discharged from the air inlet 10A. Therefore, the dust trapped in the filter 73 in the projection mode can be removed by the flow of the air W2, and the filter 73 can be prevented from being clogged.

Further, according to the projector 100, even when dust is present inside the housing 10, in the cleaning mode, the dust is not attached to the surface of the filter 73 inside the housing 10, and It can be discharged from the mouth 10A. For this reason, in the projection mode, the dust does not return to the inside of the housing 10, and the adhesion of the dust to members inside the housing 10 can be prevented.

According to the projector 100, when the cleaning mode ends, the shutter member 74a is maintained at the blocking position, and the movable member 75a is moved to the first position. Therefore, even if dust enters the case 71 from the intake port 10A, the dust can be captured by the filter 73. Therefore, it is possible to prevent dust from entering the inside of the housing 10 when the projector 100 is not used.

According to the projector 100, the end of the second flow path CH2 on the intake port 10A side is inclined with respect to the boundary B. Therefore, in the cleaning mode, the flow of the air W2 flowing from the second flow channel CH2 to the first flow channel CH1 can be made smooth, and the effect of removing dust adhering to the filter 73 can be enhanced. The surface 75s of the movable member 75a may be curved in a direction away from the boundary B with respect to the boundary B. Even with this configuration, similarly, the flow of the air W2 flowing from the second flow channel CH2 to the first flow channel CH1 can be made smooth, and the effect of removing dust adhering to the filter 73 can be enhanced.

According to the projector 100, the filter 73 is arranged on the opposite side of the second channel CH2 in the vertical direction. For this reason, the dust sowed by the air W2 easily moves to the second channel CH2 side due to gravity. As a result, the effect of removing dust can be enhanced. Of course, the projector 100 may be used in a posture in which the direction Y2 shown in FIGS. 2 and 3 is a vertical direction, or is used in a posture in which a direction perpendicular to the directions Y and X is a vertical direction. You may.

The flow path switching mechanism 75 of the first unit 70 may be configured by a shutter that moves in the direction X between a position where the boundary B is shielded and a position where the boundary B is opened. As shown in FIGS. 2 and 3, according to the configuration in which the movable member 75a is rotated to switch between the first position and the second position, the size of the flow path switching mechanism 75 can be reduced. In addition, dust that has adhered to the surface 75s of the movable member 75a in the projection mode can be removed in the cleaning mode, and the intrusion of dust into the housing 10 can be strongly prevented. Further, the channel switching mechanism 75 of the first unit 70 may be configured to be provided at, for example, an end of the second channel CH2 on the opening 71b side.

The backflow prevention unit 74 may be configured by a check valve that allows the air flowing in the direction X2 to pass as it is and blocks the air flowing in the direction X1 from the air. Employing the check valve eliminates the need for electrical driving, and enables the manufacturing cost and size of the projector 100 to be reduced. On the other hand, as shown in FIG. 2 and FIG. 3, according to the configuration in which the backflow of air to the filter 73 is prevented by opening and closing the shutter member 74a, more air flows in the projection mode than in the case where the check valve is employed. Can be taken into the housing 10, and the cooling effect of the member to be cooled can be enhanced.

FIG. 4 is a schematic cross-sectional view showing a schematic configuration of a first unit 70A which is a modified example of the first unit 70 in the projector 100 shown in FIG. The first unit 70A has the same configuration as the first unit 70 except that a vibration unit 76 is added.

The vibrator 76 is a device for vibrating the filter 73, and includes, for example, an ultrasonic vibrator and a driving element for driving the vibrator. The vibration unit 76 is controlled by the system control unit 5.

When the intake fan 7 is rotating in the reverse direction, the system control unit 5 operates the vibration unit 76 to vibrate the filter 73. The system control unit 5 stops the vibration unit 76 while the intake fan 7 is rotating forward or stopped.

According to the projector 100 equipped with the first unit 70A, the filter 73 vibrates when the intake fan 7 is rotated in the reverse direction, and the dust captured by the filter 73 is easily separated from the filter 73. Therefore, the effect of removing the dust can be enhanced. In particular, since the filter 73 is disposed on the side opposite to the vertical direction with respect to the second flow path CH2, the dust separated from the filter 73 by the vibration unit 76 can be easily moved to the second flow path CH2, Can be effectively removed.

FIGS. 5 and 6 are schematic cross-sectional views showing a schematic configuration of a first unit 70B which is a modified example of the first unit 70 in the projector 100 shown in FIG. FIG. 5 shows a state where the intake fan 7 is rotating forward, and FIG. 6 shows a state where the intake fan 7 is rotating reversely. The first unit 70B has the same configuration as the first unit 70 except that a dust control unit 77 is added.

The dust control unit 77 switches between a charging function for charging and capturing dust contained in the air by corona discharge and the like, and a charge removing function for removing dust contained in the air by corona discharge and the like to make the dust less likely to adhere. It is composed of possible devices. The dust control unit 77 is disposed between the filter 73 and the intake port 10A in the first flow channel CH1.

In the state of FIG. 5 in which the intake fan 7 is rotating forward, the dust control unit 77 charges dust contained in the air W1 sucked from the intake port 10A and captures the dust with a metal plate or the like. In the state of FIG. 6 in which the intake fan 7 is rotated in the reverse direction, the dust control unit 77 removes dust contained in the air W2 that is taken into the case 71 from the inside of the housing 10 and flows into the first flow channel CH1. I do.

According to the projector 100 equipped with the first unit 70B, the dust contained in the air W1 is charged by the dust control unit 77 when the intake fan 7 is rotating forward. Part of the charged dust is captured by a metal plate or the like of the dust control unit 77, and the rest is captured by the filter 73. Since the dust that advances to the filter 73 is charged, it can be easily captured by the filter 73.

Further, according to the projector 100 equipped with the first unit 70B, when the intake fan 7 is rotated in the reverse direction, the dust contained in the air W2 and the metal plate and the filter 73 of the dust control unit 77 in the projection mode are generated. The trapped dust is discharged by the dust control unit 77. Therefore, these dusts can be easily discharged from the air inlet 10A by the air W2.

As described above, according to the first unit 70B, in the projection mode, the amount of dust reaching the filter 73 can be reduced by the dust capturing action of the dust control unit 77. It can increase the cooling effect. Further, in the cleaning mode, the effect of removing dust existing inside the housing 10 or dust captured in the projection mode can be enhanced.

FIG. 7 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.

The system 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. 8 is a schematic cross-sectional view of range C in FIG. 7 in a state where the exhaust fan 8A shown in FIG. 7 is rotating forward. FIG. 9 is a schematic cross-sectional view of a range C in FIG. 7 in a state where the exhaust fan 8A shown in FIG. 7 is rotating in the reverse direction.

FIG. 8 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. 2 except for the changes.

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.

In the projection mode, the system control unit 5 of the projector 100A rotates the exhaust fan 8A in the reverse direction to move the movable member 75a of the second unit 80 to the second position, as shown in FIG. The shutter member 74a is moved to the blocking position. In the cleaning mode, the system control unit 5 of the projector 100A rotates the exhaust fan 8A forward to move the movable member 75a of the second unit 80 to the first position, as shown in FIG. The shutter member 74a is moved to the open position (see FIG. 8).

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, as shown in FIG. From the exhaust port 10B via the first flow channel CH1.

Further, in the projector 100A, in the cleaning mode, the exhaust fan 8A rotates forward and the air W2 enters the casing 10 from the exhaust port 10B through the first channel CH1 of the second unit 80 as shown in FIG. Incorporate 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 supplied to the second channel CH2 of the first unit 70 as shown in FIG. From the intake port 10A via the first flow channel CH1.

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 1 taken in the inside 10 can be discharged smoothly, and the dust adhering to the filter 73 of the second unit 80 can be blown off to the outside and removed. In a state where the intake fan 7 is rotated in the reverse direction (a state where the exhaust fan 8A is rotated in the forward direction), the air W2 taken in from the exhaust port 10B always passes through the filter 73. It is possible to prevent dust from entering the inside of the apparatus.

Note that, also in the projector 100A, it is preferable that the second unit 80 be provided with a vibrating unit that vibrates the filter 73. In the state shown in FIG. 9 in which the exhaust fan 8A is rotated in the reverse direction, the system control unit 5 of the projector 100A may operate the vibrating unit to vibrate the filter 73 of the second unit 80. Thereby, dust adhering to the filter 73 of the second unit 80 can be effectively removed.

Also, in the projector 100A, it is preferable that the dust control section 77 shown in FIGS. 5 and 6 be provided in the second unit 80. In the state shown in FIG. 9 in which the exhaust fan 8A is rotated in the reverse direction, the system control unit 5 of the projector 100A performs static elimination by the dust control unit 77, and in the state shown in FIG. 8 in which the exhaust fan 8A is normally rotated. The dust may be charged and captured by the dust control unit 77.

The intake fan 7 provided to face the

first units

70, 70A, 70B may not be constituted by one fan, but may be constituted by an intake-only fan and an exhaust-only fan. Specifically, for example, in the first unit 70 illustrated in FIG. 2, the intake-only fan is disposed to face the end of the first flow channel CH1 on the side opposite to the intake port 10A side, and the exhaust-only fan is the The two flow paths CH2 are disposed so as to face the end opposite to the boundary 75s side. Then, in the projection mode, the system control unit 5 rotates the intake-only fan and stops the exhaust-only fan, and takes in the air W1 from the intake port 10A into the housing 10 through the first flow channel CH1. In the cleaning mode, the system control unit 5 stops the intake-only fan and rotates the exhaust-only fan to discharge the air W2 in the housing 10 from the intake port 10A through the second flow channel CH2 and the first flow channel CH1. . By using separate fans for each flow path in this way, it is possible to control the flow of air in the projection mode and the cleaning mode with high accuracy.

Similarly, the exhaust fan 8A provided to face the second unit 80 may not be constituted by one fan but may be constituted by an exhaust fan and an intake fan. Specifically, for example, in the second unit 80 illustrated in FIG. 8, the intake-only fan is disposed to face the end of the first flow channel CH1 on the side opposite to the exhaust port 10B side, and the exhaust-only fan is The two flow paths CH2 are disposed so as to face the end opposite to the boundary 75s side. Then, in the cleaning mode, the system control unit 5 rotates the intake-only fan and stops the exhaust-only fan, and takes in the air W2 into the housing 10 from the exhaust port 10B through the first flow channel CH1. In the projection mode, the system control unit 5 stops the intake-only fan and rotates the exhaust-only fan to discharge the air W1 inside the housing 10 from the exhaust port 10B through the second flow channel CH2 and the first flow channel CH1. . By using separate fans for each flow path in this way, it is possible to control the flow of air in the projection mode and the cleaning mode with high accuracy.

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 first flow path connecting the opening and the inside of the housing,
A filter provided for the first flow path for capturing dust,
A portion of the first flow path closer to the opening than the filter, a second flow path connecting the inside of the housing,
In the state where the fan is rotating forward, the boundary between the first flow path and the second flow path is shielded to divide the first flow path and the second flow path, and the fan is rotating in the reverse direction. In the state, a flow path switching mechanism for communicating the first flow path and the second flow path,
When the fan is rotating forward, the air that has passed through the filter flows into the housing, and when the fan is rotating in the reverse direction, air flows from the housing to the filter. A projection device comprising: a backflow prevention unit that prevents inflow.

(2)
(1) The projection device according to (1),
The flow path switching mechanism is configured to shield a boundary between the first flow path and the second flow path to divide the first flow path and the second flow path, and the first flow path and the second flow path. A movable member that moves between a second position that opens the boundary of the flow path and communicates the first flow path and the second flow path, and a driving unit that drives the movable member; Projection device.

(3)
(2) The projection device according to (2),
A projection device wherein an end of the second flow path on the opening side is inclined with respect to the boundary or curved in a direction away from the boundary.

(4)
The projection device according to any one of (1) to (3),
A dust control unit that is disposed between the filter and the opening in the first flow path and charges and captures dust contained in air sucked from the opening in a state where the fan is normally rotated. A projection device further including:

(5)
(4) The projection device according to (4),
The projection device, wherein the dust control unit removes dust contained in air discharged from the inside of the housing when the fan is rotated in the reverse direction.

(6)
The projection device according to any one of (1) to (5),
A projection device further comprising a vibrating unit that vibrates the filter in a state where the fan is rotated in the reverse direction.

(7)
(6) The projection device according to (6),
The projection device, wherein the filter is disposed on a side opposite to the vertical direction with respect to the second flow path.

(8)
The projection device according to any one of (1) to (7),
The backflow prevention unit is a member that moves between a position that blocks a flow path that connects the filter and the inside of the housing and a position that opens the flow path, and a driving unit that drives the member. Projection device configured.

(9)
The projection device according to any one of (1) to (8),
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,
A first unit provided between the first opening and the intake fan,
A second unit provided between the second opening and the exhaust fan,
The first unit, wherein the fan is the intake fan and the opening is the first opening, the first flow path, the filter, the second flow path, the flow path switching mechanism, and the backflow prevention Part
The second unit, wherein the fan is the exhaust fan and the opening is the second opening, the first flow path, the filter, the second flow path, the flow path switching mechanism, and the backflow prevention Projection device having a part.

(10)
A housing having an opening, and a fan that takes in air into the housing from the opening during normal rotation and discharges air from the housing from the opening during reverse rotation. A first flow path connecting the opening and the inside of the housing, and a filter provided for the first flow path, for capturing dust, a control method for a projection device, comprising:
In a state in which the fan is rotated forward, a boundary between the first flow path and a second flow path that connects a portion of the first flow path closer to the opening than the filter and the inside of the housing. A flow path switching step of shielding the first flow path and the second flow path to block the air flow, and in a state where the fan is rotated in the reverse direction, communicating the first flow path and the second flow path,
When the fan is rotating forward, the air that has passed through the filter flows into the housing, and when the fan is rotating in the reverse direction, air flows from the housing to the filter. A method for controlling a projection device, comprising: a backflow prevention step of preventing inflow.

(11)
(10) The method for controlling a projection device according to (10),
In the flow path switching step, a first position for blocking the boundary between the first flow path and the second flow path and dividing the first flow path and the second flow path, and the first flow path and the second flow path A method of controlling a projection device, wherein a movable member is moved between a second position where the boundary of a road is opened to communicate the first flow path and the second flow path.

(12)
(11) The method for controlling a projection device according to (11),
The movable member is a member that is rotatable around a rotation shaft provided at an end of the boundary on the opening side, and is rotated from the first position to the second flow path side. Move to the second position above,
A control method for a projection device, wherein a surface of the movable member on the second flow path side in a state where the movable member is at the second position is inclined with respect to the boundary or curved in a direction away from the boundary.

(13)
(10) The method for controlling a projection device according to any one of (12) to (12),
A method of controlling a projection device, wherein, in a state where the fan is rotating forward, a portion of the first flow path between the filter and the opening is charged and captures dust contained in air passing through the portion.

(14)
(13) The method for controlling a projection device according to (13), wherein
A control method of a projection device for removing static electricity from dust contained in air flowing into the first flow path from the inside of the housing when the fan is rotated in the reverse direction.

(15)
(10) The method for controlling a projection device according to any one of (14) to (14),
A control method for a projection device, wherein the filter vibrates in a state where the fan is rotated in the reverse direction.

(16)
(15) The control method of the projection device according to (15),
The control method of a projection device, wherein the filter is disposed on a side opposite to the vertical direction with respect to the second flow path.

(17)
(10) The method for controlling a projection device according to any one of (16) to (16),
In the backflow prevention step, by moving a member that moves between a position that blocks the flow path that connects the filter and the inside of the housing and a position that opens the flow path, the flow path is blocked. A control method of a projection device that performs opening.

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 August 31, 2018 (Japanese Patent Application No. 2018-163211), 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 System control unit 7

Intake fans

70, 70A, 70B First unit 71

Case

71a, 71b Opening 72 Fixed wall 73 Filter 74 Backflow prevention unit 74a Shutter member 74b Motor 75 Channel switching mechanism 75a Movable member 75b Rotary shaft 75s Surface 76 Vibration unit 77 Dust control unit W1,

W2 Air

8, 8A Exhaust fan 80 Second unit 10 Housing 10A Inlet 10B Exhaust ports A, C Range B Boundary CH1 First channel CH2 Second channel

Claims

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 first flow path connecting the opening and the inside of the housing,
A filter provided for the first flow path for capturing dust,
A portion of the first flow path closer to the opening than the filter, a second flow path connecting the inside of the housing,
In a state where the fan is rotating forward, the boundary between the first flow path and the second flow path is shielded to divide the first flow path and the second flow path, and the fan is rotating in the reverse direction. In the state, a flow path switching mechanism for communicating the first flow path and the second flow path,
When the fan is rotating forward, the air that has passed through the filter flows into the housing, and when the fan is rotating in the reverse direction, the air flows from the housing to the filter. A projection device comprising: a backflow prevention unit that prevents inflow.
The projection device according to claim 1,
The flow path switching mechanism, a first position to block the boundary between the first flow path and the second flow path to divide the first flow path and the second flow path, the first flow path and the second flow path A movable member that moves between a second position that opens the boundary of the flow path and communicates the first flow path and the second flow path, and a driving unit that drives the movable member. Projection device.
The projection device according to claim 2,
The projection device, wherein the end of the second flow path on the opening side is inclined with respect to the boundary or curved in a direction away from the boundary.
The projection device according to claim 1, wherein:
A dust control unit that is disposed between the filter and the opening in the first flow path and charges and captures dust contained in air sucked from the opening in a state where the fan is normally rotated. A projection device further including:
The projection device according to claim 4, wherein
The projection device, wherein the dust control unit is configured to neutralize dust contained in air discharged from the inside of the housing when the fan is rotated in the reverse direction.
The projection device according to claim 1, wherein:
A projection device further comprising a vibrating unit that vibrates the filter in a state where the fan is rotated in the reverse direction.
The projection device according to claim 6,
The projection device, wherein the filter is disposed on a side opposite to the vertical direction with respect to the second flow path.
The projection device according to claim 1, wherein:
The backflow prevention unit is a member that moves between a position that blocks a flow path that connects the filter and the inside of the housing and a position that opens the flow path, and a driving unit that drives the member. Projection device configured.
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,
A first unit provided between the first opening and the intake fan,
A second unit provided between the second opening and the exhaust fan,
The first unit, wherein the fan is the intake fan and the opening is the first opening, the first flow path, the filter, the second flow path, the flow path switching mechanism, and the backflow prevention Part,
The second unit, wherein the fan is the exhaust fan and the opening is the second opening, the first flow path, the filter, the second flow path, the flow path switching mechanism, and the backflow prevention Projection device having a part.
A housing having an opening, and a fan that takes in air into the housing from the opening during normal rotation and exhausts air from the opening from the opening during reverse rotation. A first flow path connecting the opening and the inside of the housing, and a filter provided for the first flow path, for capturing dust, a control method for a projection apparatus,
In a state where the fan is rotating forward, a boundary between the first flow path and a second flow path that connects a portion of the first flow path closer to the opening than the filter and the inside of the housing. A flow path switching step of blocking the first flow path and the second flow path to shield the fan, and in a state in which the fan is rotated in the reverse direction, the first flow path and the second flow path communicate with each other.
When the fan is rotating forward, the air that has passed through the filter flows into the housing, and when the fan is rotating in the reverse direction, the air flows from the housing to the filter. A method for controlling a projection device, comprising: a backflow prevention step of preventing inflow.
The method of controlling a projection device according to claim 10,
In the flow path switching step, a first position for blocking a boundary between the first flow path and the second flow path and separating the first flow path and the second flow path, and the first flow path and the second flow path A method of controlling a projection device, wherein a movable member is moved between a second position where the boundary of a road is opened to communicate the first flow path and the second flow path.
The control method of a projection device according to claim 11, wherein
The movable member is a member that is rotatable around a rotation axis provided at an end of the boundary on the opening side, and is rotated from the first position to the second channel side. Move to the second position,
A control method for a projection device, wherein a surface of the movable member on the second flow path side in a state where the movable member is at the second position is inclined with respect to the boundary or curved in a direction away from the boundary.
It is a control method of the projection apparatus as described in any one of Claims 10 to 12, Comprising:
A method of controlling a projection apparatus, wherein, in a state where the fan is rotating forward, a portion of the first flow path between the filter and the opening is charged and captures dust contained in air passing through the portion.
A method for controlling a projection device according to claim 13,
A control method of a projection device for removing static electricity from dust contained in air flowing into the first flow path from the inside of the housing when the fan is rotated in the reverse direction.
It is a control method of the projection apparatus as described in any one of Claims 10 to 14, Comprising:
A control method for a projection device, which vibrates the filter in a state where the fan is rotated in the reverse direction.
A control method for a projection device according to claim 15, wherein
The control method of a projection device, wherein the filter is disposed on a side opposite to a vertical direction with respect to the second flow path.
It is a control method of the projection apparatus as described in any one of Claims 10 to 16, Comprising:
In the backflow prevention step, by moving a member that moves between a position that blocks the flow path that connects the filter and the inside of the housing and a position that opens the flow path, the flow path is blocked. A control method of a projection device that performs opening.