JP6872083B2 - Projection device and its control method - Google Patents

Description

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 the light from the light source, an optical system for guiding the light from the light source to the light modulation element, and the like in the housing. In order to prevent dust from adhering to such members in the housing, a member whose dust is desired to be prevented from adhering is provided in the sealed space.

Patent Document 1 describes a projector provided with a color separation optical system in a space in which a slight movement of air (so-called respiration phenomenon) occurs inside and outside the space due to a temperature change in the space or the like.

Patent Document 2 describes a liquid crystal projector in which a condenser lens, a reflection mirror, and the like are provided in a sealed space.

Patent Document 3 describes a projector in which a cooling fan and a pickup optical system are provided in a sealed space.

Patent Document 4 describes a projector in which a liquid crystal panel and a cooling fan are provided in a sealed space.

Japanese Patent Application Laid-Open No. 2011-075977 Japanese Patent Application Laid-Open No. 2007-147728 Japanese Patent Application Laid-Open No. 2017-138376 Japanese Patent Application Laid-Open No. 2000-330207

As described in Patent Document 2, in the configuration in which the optical member is arranged in the sealed space, the temperature of the optical member rises due to the condensing of light from the light source or the like. Therefore, how to cool the optical member becomes an issue. As described in Patent Documents 3 and 4, in the configuration in which the cooling fan is provided inside the sealed space, the projector becomes large and the manufacturing cost increases.

The projector described in Patent Document 1 is capable of moving a small amount of air inside and outside the space. Therefore, the temperature inside the space can be easily adjusted, but in this configuration, the adhesion of dust to the members inside the space is unavoidable.

The present invention has been made in view of the above circumstances, and it is possible to control the temperature of a member that requires cooling and prevent dust from adhering to the member and prevent dust from adhering to the member with a simple configuration. It is an object of the present invention to provide a projection device and a method for controlling the projection device.

The projection device of the present invention is a projection device including a light source, a light modulation element that spatially modulates the light from the light source, and a plurality of optical members through which the light from the light source passes, and the plurality of optics. An accommodating portion having an opening for accommodating a specific optical member among the members, a movable sealing member for sealing the accommodating portion, a drive mechanism for driving the sealing member, and the sealing member by the driving mechanism. It is provided with a control unit that is moved to control the volume of the sealed internal space of the storage unit.

The control method of the projection device of the present invention specifies a light source, a light modulation element that spatially modulates the light from the light source, a plurality of optical members through which the light from the light source passes, and the plurality of optical members. A method of controlling a projection device having an opening and an opening for accommodating the optical member of the above, wherein a movable sealing member for sealing the accommodating portion is moved to form a sealed internal space of the accommodating portion. It is provided with a control step for controlling the volume of the light source.

According to the present invention, there is provided a projection device and a control method thereof capable of adjusting the temperature of a member that requires cooling and preventing dust from adhering to the member and preventing dust from adhering to the member with a simple configuration. be able to.

It is a schematic diagram which shows the schematic structure of the projector 100 which is one Embodiment of the projection apparatus of this invention. It is a schematic diagram which shows the state which the sealing member 26 of the projector 100 shown in FIG. 1 has moved. It is a flowchart for demonstrating the operation of the control part 50 of the projector 100 shown in FIG. It is a schematic diagram which shows the schematic structure of the projector 200 which is another embodiment of the projection apparatus of this invention.

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

FIG. 1 is a schematic view 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 light source 10 that emits light, an illumination optical unit 20, an optical modulation unit 30, a projection optical system 40, and a control unit 50 that controls the entire system.

The light source 10 includes a light emitting element such as a laser or an LED (Light Emitting Diode).

The illumination optical unit 20 includes a case 21, a condenser lens 22 which is one of the optical members, a fly-eye lens 23 which is one of the optical members, a fly-eye lens 24 which is one of the optical members, and air. A cylinder 25, a sealing member 26, and a temperature sensor 27 are provided.

The case 21 is a tubular member having an opening 21a on one end side in the optical axis direction and an opening 21b on the other end side in the optical axis direction. An opening 21c is formed on the inner peripheral surface of the case 21 to reach the outer peripheral surface of the case 21.

The condenser lens 22 is fixed to one end side of the case 21 so as to close the opening 21a of the case 21. The condensing lens 22 condenses the light emitted from the light source 10 on each lens of the fly-eye lens 23.

The fly-eye lens 24 is fixed to the other end side of the case 21 so as to close the opening 21b of the case 21. The fly-eye lens 24 is fixed to the case 21 with each lens facing the side opposite to the condenser lens 22 side.

The fly-eye lens 23 is fixed to the inner peripheral surface of the case 21 between the condenser lens 22 and the fly-eye lens 24 with each lens facing the condenser lens 22 side. The fly-eye lens 23 and the fly-eye lens 24 are optical systems for making the illuminance distribution of the light emitted from the light source 10 uniform. Light is condensed by the condenser lens 22 on each lens of the fly-eye lens 23. Therefore, the fly-eye lens 23 is one of the members having a large temperature rise.

A storage space for accommodating the fly-eye lens 23 is formed by a space including the inner peripheral surface of the case 21, a space surrounded by the condenser lens 22, the fly-eye lens 24, and the opening 21c. The case 21, the condenser lens 22, and the fly-eye lens 24 form an accommodating portion that forms this accommodating space.

The sealing member 26 is provided inside the opening 21c with the opening 21c of the case 21 closed. The sealing member 26 is slidably provided in the direction from the outer peripheral surface to the inner peripheral surface of the case 21 and in the opposite direction. The above-mentioned accommodation space is sealed by the sealing member 26.

The internal space SP1 sealed by the sealing member 26 in the above-mentioned accommodation space is maintained in airtightness to such an extent that air cannot flow in from the outside and air can flow out to the outside.

The temperature sensor 27 is a temperature detection unit that detects the temperature of the internal space SP1, and is configured by using a thermocouple, a thermistor, or the like. The temperature information of the internal space SP1 detected by the temperature sensor 27 is input to the control unit 50.

The air cylinder 25 includes an air supply / discharge pipe 25b for supplying air to the inside of the cylinder body 25a and the inside of the cylinder body 25a and discharging air from the inside of the cylinder body 25a, and an air supply / discharge pipe 25b. An air pump 25c for supplying air to and discharging air from the air pump 25c, and a piston 25d that moves according to a change in air pressure inside the cylinder body 25a are provided. The piston 25d is fixed to the sealing member 26. Therefore, as the piston 25d moves, as shown in FIGS. 1 and 2, the sealing member 26 moves in the opening 21c, and the volume of the internal space SP1 changes. The air cylinder 25 constitutes a drive mechanism for driving the sealing member 26.

The light modulation unit 30 is a liquid crystal to which a color separation optical system that separates the light emitted from the illumination optical unit 20 into red light, green light, and blue light and red light separated by the color separation optical system are incident. A panel, a liquid crystal panel on which green light separated by a color separation optical system is incident, a liquid crystal panel on which blue light separated by a color separation optical system is incident, and red light transmitted through these three liquid crystal panels. The configuration includes a prism that emits blue light and green light toward the projection optical system 40. The three liquid crystal panels included in the light modulation unit 30 constitute a light modulation element that spatially modulates the light from the light source 10 based on the image data.

The projection optical system 40 projects red light, blue light, and green light emitted from the prism of the optical modulation unit 30 onto a screen (not shown).

The control unit 50 controls the light source 10, the air pump 25c, the optical modulation unit 30, and the like, and is composed of various processors.

As a processor, a programmable logic device (programmable logic device) which is a processor whose circuit configuration can be changed after manufacturing such as a CPU (Central Processing Unit), which is a general-purpose processor that executes a program and performs various processes, and an FPGA (Field Programmable Gate Array). A dedicated electric circuit or the like, which is a processor having a circuit configuration specially designed for executing a specific process such as Programmable Logic Device (PLD) or ASIC (Application Special Integrated Circuit), and the like are included.

More specifically, the structure of these processors is an electric circuit in which circuit elements such as semiconductor elements are combined.

The control unit 50 may be composed of one of the various processors described above, or may be 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). It may be configured.

The control unit 50 acquires temperature information from the temperature sensor 27 and detects the temperature of the internal space SP1. Further, the control unit 50 controls the volume of the internal space SP1 based on the temperature of the internal space SP1.

Specifically, the control unit 50 adjusts the volume of the internal space SP1 by controlling the air pump 25c and moving the sealing member 26. The control unit 50 controls the volume of the internal space SP1 between a predetermined value V1 and a value V2 larger than this value V1. When the sealing member 26 is in the position shown in FIG. 1, the volume of the internal space SP1 is the value V1, and when the sealing member 26 is in the position shown in FIG. 2, the volume of the internal space SP1 is the value V2.

FIG. 3 is a flowchart for explaining the operation of the control unit 50 of the projector 100 shown in FIG. When the power of the projector 100 is turned on, the operation shown in FIG. 3 is started. In the initial state immediately after the power is turned on, the sealing member 26 is at the position shown in FIG. 1, and the volume of the internal space SP1 is controlled to the value V1.

First, the control unit 50 acquires temperature information from the temperature sensor 27 and detects the temperature of the internal space SP1 (step S1). Then, the control unit 50 determines whether or not the detected temperature exceeds a predetermined threshold value TH (step S2).

When the control unit 50 determines that the detected temperature exceeds the threshold value TH (step S2: YES), the control unit 50 controls to increase the volume of the internal space SP1 from the value V1 to the value V2 (step S3).

Specifically, the control unit 50 controls the air pump 25c to move the sealing member 26 from the position shown in FIG. 1 to the position shown in FIG. 2 at the first speed. This first speed is a speed at which the temperature of the internal space SP1 can be lowered by causing an adiabatic change in the air in the internal space SP1.

After moving the sealing member 26 from the position of FIG. 1 to the position of FIG. 2 at the first speed, the control unit 50 moves the sealing member 26 from the position of FIG. 2 to the position of FIG. 1 at the second speed. Then, the volume of the internal space SP1 is returned to the value V1 (step S4). The second speed is slower than the first speed, and is set to such a speed that the air in the internal space SP1 does not undergo an adiabatic change.

The control unit 50 returns the process to step S1 after step S4. Further, when the determination in step S2 becomes NO, the control unit 50 returns the process to step S1. By repeating the above process, the temperature of the internal space SP1 is kept below the threshold value TH while the projector 100 is operating.

As described above, in the projector 100, the fly-eye lens 23 is arranged in the sealed internal space SP1. Therefore, it is possible to prevent dust from adhering to each lens of the fly-eye lens 23. Since light is condensed by the condenser lens 22 on each lens of the fly-eye lens 23, the quality of the projected image can be improved by preventing dust from adhering to each lens.

Since the fly-eye lens 23 has a configuration in which light is focused on each lens by the condenser lens 22, the temperature tends to rise. According to the projector 100, since the temperature of the internal space SP1 can be kept below the threshold value TH, it is possible to prevent the temperature of the fly-eye lens 23 from rising, and stable image projection is possible.

Further, according to the projector 100, the temperature control of the internal space SP1 can be realized by a simple configuration in which the sealing member 26 is simply moved. Therefore, for example, it is not necessary to provide a cooling fan in the internal space SP1, and it is possible to reduce the size of the device, save power, and reduce the manufacturing cost.

In the projector 100, it is preferable that the humidity of the internal space SP1 is adjusted at the time of manufacture so as to be a value sufficiently lower (for example, 20% or less) than the humidity outside the internal space SP1. Specifically, the humidity of the internal space SP1 is the humidity at which dew condensation may occur in the internal space SP1 due to a decrease in the temperature of the internal space SP1 due to an increase in the volume of the internal space SP1 (processing in step S3) under the control of the control unit 50. By setting the value lower than, even when the temperature of the internal space SP1 is lowered, it is possible to prevent the occurrence of dew condensation in the internal space SP1.

Further, the air cylinder 25 of the projector 100 can be replaced with a hydraulic cylinder. When the air cylinder 25 is used, the projector 100 can be downsized and the manufacturing cost can be reduced.

Further, the projector 100 may adopt a configuration in which the sealing member 26 is driven by using a solenoid and an urging means instead of the air cylinder 25.

In the above description, the optical member housed in the internal space SP1 is the fly-eye lens 23, but the optical member housed in the internal space SP1 needs to prevent dust from adhering to the projector 100 and is cooled. Any optical member that requires the above may be used, and may be a member other than the fly-eye lens 23. In the projector 100, the fly-eye lens 23 constitutes a specific optical member.

FIG. 4 is a schematic view showing a schematic configuration of a projector 200, which is another embodiment of the projection device of the present invention. The projector 200 is different from the projector 100 except that the illumination optical unit 20 is changed to the illumination optical unit 60, the optical modulation unit 30 is changed to the optical modulation unit 30A, and the control unit 50 is changed to the control unit 50A. It has the same configuration.

The illumination optical unit 60 includes a color wheel 65, a rod integrator lens 62, a relay lens 63, an accommodating portion 61 for accommodating the rod integrator lens 62, a sealing member 64, and an air cylinder 25 having the above-described configuration. ..

The color wheel 65 is arranged between the light source 10 and the rod integrator lens 62. The color wheel 65 is a disk-shaped member, and an R filter that transmits red light, a G filter that transmits green light, and a B filter that transmits blue light are provided along the circumferential direction thereof. The color wheel 65 is rotated about an axis, and the light emitted from the light source 10 is separated into red light, green light, and blue light in a time-divided manner and guided to the rod integrator lens 62.

The rod integrator lens 62 totally reflects the light incident from the color wheel 65 inside, so that the illuminance distribution of the light is made uniform and emitted. The light emitted from the rod integrator lens 62 passes through the relay lens 63 and is incident on the light modulation unit 30A. The rod integrator lens 62 is one of the members having a large temperature rise because the light is concentrated on the light emitting surface thereof.

The optical modulation unit 30A includes a DMD (Digital Micromirror Device; registered trademark), which is an element in which a plurality of movable mirrors into which light from a relay lens 63 is incident is arranged in a two-dimensional manner, and a drive circuit for driving the DMD. including. This DMD constitutes a light modulation element that spatially modulates the light from the light source 10 based on the image data. The light spatially modulated by the DMD is projected onto the screen via the projection optical system 40.

The accommodating portion 61 is a tubular member having an opening 61a on one end side in the optical axis direction and an opening 61b on the other end side in the optical axis direction. An opening 61c is formed on the inner peripheral surface of the accommodating portion 61 to reach the outer peripheral surface of the accommodating portion 61.

The end of the rod integrator lens 62 on the light incident side is fitted into the opening 61a of the accommodating portion 61, and the portion other than this end is arranged inside the accommodating portion 61.

The end of the relay lens 63 on the light incident side is fitted into the opening 61b of the accommodating portion 61, and the portion other than this end is arranged outside the accommodating portion 61.

A storage space for accommodating the rod integrator lens 62 is formed by a space in which the portion of the hollow portion of the accommodating portion 61 excluding the portion closed by the rod integrator lens 62 and the relay lens 63 and the opening 61c are combined. ..

The sealing member 64 is provided inside the opening 61c with the opening 61c of the accommodating portion 61 closed. The sealing member 64 is slidably provided in the direction from the outer peripheral surface to the inner peripheral surface of the accommodating portion 61 and in the opposite direction. The accommodation space is sealed by the sealing member 64. The sealing member 64 is fixed to the piston 25d of the air cylinder 25. The air pump 25c of the air cylinder 25 is controlled by the control unit 50A.

The internal space SP2 sealed by the sealing member 64 in the above-mentioned accommodation space is maintained to be airtight enough to prevent the inflow of air from the outside and the outflow of air to the outside.

The temperature sensor 27a is a temperature detection unit that detects the temperature of the internal space SP2, and is configured by using a thermocouple, a thermistor, or the like. The temperature information of the internal space SP2 detected by the temperature sensor 27a is input to the control unit 50A.

In the projector 200 having the above configuration, the control unit 50A acquires the temperature information from the temperature sensor 27a and detects the temperature of the internal space SP2. Then, the control unit 50A determines whether or not the detected temperature exceeds the threshold value TH.

When the control unit 50A determines that the detected temperature exceeds the threshold value TH, the control unit 50A controls to increase the volume of the internal space SP2 from the value V1 to the value V2. Specifically, the control unit 50A controls the air pump 25c to move the sealing member 64 from the position shown in FIG. 4 to a predetermined position on the lower side at a third speed. This third speed is a speed at which the temperature in the internal space SP2 can be lowered by causing an adiabatic change in the air in the internal space SP2.

The control unit 50A moves the sealing member 64 from the position shown in FIG. 4 to the above-mentioned predetermined position at the third speed, and then moves the sealing member 64 to the position shown in FIG. 4 at the fourth speed. Restore the position of 64. The fourth speed is slower than the third speed, and is set to such a speed that the air in the internal space SP2 does not undergo an adiabatic change. By repeating the above processing, the control unit 50A keeps the temperature of the internal space SP2 below the threshold value TH.

As described above, in the projector 200, at least the end portion of the rod integrator lens 62 on the light emitting side is arranged in the sealed internal space SP2. Therefore, it is possible to prevent dust from adhering to the light emitting surface of the rod integrator lens 62. The quality of the projected image can be improved by preventing dust from adhering to the light emitting surface of the rod integrator lens 62.

Further, according to the projector 200, since the temperature of the internal space SP2 can be kept below the threshold value TH, it is possible to prevent the temperature of the rod integrator lens 62 from rising, and stable image projection becomes possible.

Further, according to the projector 200, the temperature control of the internal space SP2 can be realized by a simple configuration in which the sealing member 64 is simply moved. Therefore, for example, it is not necessary to provide a cooling fan in the internal space SP2, and it is possible to reduce the size of the device, save power, and reduce the manufacturing cost.

In the projector 200, it is preferable to adjust the humidity of the internal space SP2 at the time of manufacturing so that the humidity is sufficiently lower than the humidity outside the internal space SP2 (for example, 20% or less). Specifically, the humidity of the internal space SP2 is set to a value lower than the humidity at which dew condensation may occur in the internal space SP2 due to the decrease in the temperature of the internal space SP2 due to the increase in the volume of the internal space SP2 under the control of the control unit 50A. By setting this, even when the temperature of the internal space SP2 is lowered, it is possible to prevent the occurrence of dew condensation in the internal space SP2.

Further, the air cylinder 25 of the projector 200 can be replaced with a hydraulic cylinder. Further, instead of the air cylinder 25, a configuration in which the sealing member 64 is driven by using a solenoid and an urging means may be adopted.

In the above description, the optical member housed in the internal space SP2 is an example of the rod integrator lens 62, but the optical member housed in the internal space SP2 needs to prevent the adhesion of dust in the projector 200 and is cooled. Any optical member that requires the above may be used, and may be other than the rod integrator lens 62. In the projector 200, the rod integrator lens 62 constitutes a specific optical member.

The control unit 50 of the projector 100 controls the position of the sealing member 26 based on the temperature of the internal space SP1, but the present invention is not limited to this. For example, the control unit 50 may periodically execute the processes of steps S3 and S4 while the projector 100 is operating, regardless of the temperature of the internal space SP1. Even with this configuration, the temperature of the internal space SP1 can be kept low.

Similarly, during the operation of the projector 200, the control unit 50A of the projector 200 periodically increases the volume of the internal space SP2 at a high speed and then restores it at a low speed regardless of the temperature of the internal space SP2. May be executed. Even with this configuration, the temperature of the internal space SP2 can be kept low.

As described above, the following matters are disclosed in the present specification.

(1)
A projection device including a light source, a light modulation element that spatially modulates the light from the light source, and a plurality of optical members through which the light from the light source passes.
An accommodating portion having an opening for accommodating a specific optical member among the plurality of optical members,
A movable sealing member that seals the housing part,
The drive mechanism that drives the sealing member and
A projection device including a control unit that moves the sealing member by the driving mechanism to control the volume of the sealed internal space of the housing unit.

(2)
(1) The projection device according to the above.
A temperature detection unit for detecting the temperature of the internal space of the accommodation unit is further provided.
The control unit is a projection device that controls the volume of the storage unit based on the temperature.

(3)
(2) The projection device according to the above.
The control unit is a projection device that increases the volume of the accommodating unit from a predetermined value when the temperature exceeds a predetermined threshold value.

(4)
(3) The projection device according to the above.
The control unit is a projection device that controls the speed at which the volume is increased to the speed at which the adiabatic change is caused.

(5)
(4) The projection device according to the above.
The control unit is a projection device that increases the volume and then reduces the volume to the above value at a speed slower than the speed at which the volume is increased.

(6)
The projection device according to any one of (1) to (5).
A projection device in which the humidity of the internal space is lower than the humidity of the outside of the internal space.

(7)
(6) The projection device according to the above.
A projection device in which the humidity of the internal space is lower than the humidity at which dew condensation can occur in the internal space due to a decrease in temperature of the internal space due to an increase in volume by the control unit.

(8)
The projection device according to any one of (1) to (7).
The drive mechanism is a projection device that is an air cylinder.

(9)
The projection device according to any one of (1) to (8).
The specific optical member is a projection device arranged between the light source and the light modulation element, which is an optical member for equalizing the illuminance distribution of light from the light source.

(10)
(9) The projection device according to the above.
The light modulation element is a liquid crystal panel.
The specific optical member is a projection device that is a fly-eye lens.

(11)
(9) The projection device according to the above.
The light modulation element is an element in which a plurality of movable mirrors are arranged two-dimensionally.
The specific optical member is a projection device that is a rod integrator lens.

(12)
It has an opening that accommodates a light source, a light modulation element that spatially modulates the light from the light source, a plurality of optical members through which the light from the light source passes, and a specific optical member among the plurality of optical members. It is a control method of a projection device having a housing portion and a housing portion.
A method for controlling a projection device, comprising a control step of moving a movable sealing member that seals the housing portion to control the volume of the sealed internal space of the housing portion.

(13)
(12) The method for controlling a projection device according to the above.
Further provided with a temperature detection step for detecting the temperature of the internal space of the accommodating portion,
In the control step, a method for controlling a projection device that controls the volume of the accommodating portion based on the temperature.

(14)
(13) The method for controlling a projection device according to the above.
In the control step, a method for controlling a projection device that increases the volume from a predetermined value when the temperature exceeds a predetermined threshold value.

(15)
(14) The method for controlling a projection device according to the above.
In the control step, a method for controlling a projection device that controls the speed at which the volume is increased to the speed at which the adiabatic change is caused.

(16)
(15) The method for controlling a projection device according to the above.
In the control step, a method for controlling a projection device in which the volume is increased and then the volume is reduced to the above value at a speed slower than the speed at which the volume is increased.

(17)
The method for controlling a projection device according to any one of (12) to (16).
In the control step, a method for controlling a projection device that operates an air cylinder to move the sealing member.

(18)
The method for controlling a projection device according to any one of (12) to (17).
The specific optical member is a method for controlling a projection device, which is an optical member arranged between the light source and the light modulation element and for equalizing the illuminance distribution of light from the light source.

(19)
(18) The method for controlling a projection device according to the above.
The light modulation element is a liquid crystal panel.
The specific optical member is a method for controlling a projection device that is a fly-eye lens.

(20)
(18) The method for controlling a projection device according to the above.
The light modulation element is an element in which a plurality of movable mirrors are arranged two-dimensionally.
The specific optical member is a method for controlling a projection device that is a rod integrator lens.

Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, which naturally belong to the technical scope of the present invention. Understood. Further, each component in the above-described embodiment may be arbitrarily combined as long as the gist of the invention is not deviated.

This application is based on a Japanese patent application filed on September 20, 2018 (Japanese Patent Application No. 2018-176271), the contents of which are incorporated herein by reference.

The present invention is highly convenient and effective when applied to a liquid crystal projector, a DLP (Digital Light Processing, registered trademark) projector, or the like.

100 Projector 10 Light source 20, 60 Illumination optical unit 21 Case 21a, 21b, 21c Opening 22 Condensing lens 23, 24 Fly eye lens 25 Air cylinder 25a Cylinder body 25b Air supply / discharge pipe 25c Air pump 25d Piston 26 Sealing member 27, 27a Temperature sensor SP1 Internal space 30, 30A Optical modulation unit 40 Projection optical system 50, 50A Control unit 200 Projector 61 Housing unit 61a, 61b, 61c Opening 62 Rod integrator lens 63 Relay lens 64 Sealing member 65 Color wheel SP2 Internal space

Claims (20)

A projection device including a light source, a light modulation element that spatially modulates the light from the light source, and a plurality of optical members through which the light from the light source passes.
An accommodating portion having an opening for accommodating a specific optical member among the plurality of optical members,
A movable sealing member that seals the housing portion,
A drive mechanism for driving the sealing member and
A projection device including a control unit that moves the sealing member by the driving mechanism to control the volume of the sealed internal space of the housing unit. The projection device according to claim 1.
A temperature detecting unit for detecting the temperature of the internal space of the accommodating unit is further provided.
The control unit is a projection device that controls the volume of the storage unit based on the temperature. The projection device according to claim 2.
The control unit is a projection device that increases the volume of the accommodating unit from a predetermined value when the temperature exceeds a predetermined threshold value. The projection device according to claim 3.
The control unit is a projection device that controls the speed at which the volume is increased to the speed at which the adiabatic change is caused. The projection device according to claim 4.
The control unit is a projection device that increases the volume and then decreases the volume to the value at a speed slower than the rate at which the volume is increased. The projection device according to any one of claims 1 to 5.
A projection device in which the humidity of the internal space is lower than the humidity of the outside of the internal space. The projection device according to claim 6.
A projection device in which the humidity of the internal space is lower than the humidity at which dew condensation can occur in the internal space due to a decrease in temperature of the internal space due to an increase in the volume by the control unit. The projection device according to any one of claims 1 to 7.
The drive mechanism is a projection device that is an air cylinder. The projection device according to any one of claims 1 to 8.
The specific optical member is a projection device arranged between the light source and the light modulation element, which is an optical member for equalizing the illuminance distribution of light from the light source. The projection device according to claim 9.
The light modulation element is a liquid crystal panel.
The specific optical member is a projection device that is a fly-eye lens. The projection device according to claim 9.
The light modulation element is an element in which a plurality of movable mirrors are arranged two-dimensionally.
The specific optical member is a projection device that is a rod integrator lens. It has an opening that accommodates a light source, a light modulation element that spatially modulates the light from the light source, a plurality of optical members through which the light from the light source passes, and a specific optical member among the plurality of optical members. It is a control method of a projection device having a housing portion and a housing portion.
A method of controlling a projection device comprising a control step of moving a movable sealing member that seals the housing to control the volume of the sealed internal space of the housing. The method for controlling a projection device according to claim 12.
A temperature detection step for detecting the temperature of the internal space of the housing is further provided.
In the control step, a method for controlling a projection device that controls the volume of the accommodating portion based on the temperature. 13. The method for controlling a projection device according to claim 13.
In the control step, a method for controlling a projection device that increases the volume from a predetermined value when the temperature exceeds a predetermined threshold value. 14. The method for controlling a projection device according to claim 14.
In the control step, a method for controlling a projection device that controls the speed at which the volume is increased to the speed at which the adiabatic change is caused. The method for controlling a projection device according to claim 15.
In the control step, a method for controlling a projection device in which the volume is increased and then the volume is decreased to the value at a speed slower than the rate at which the volume is increased. The method for controlling a projection device according to any one of claims 12 to 16.
In the control step, a method for controlling a projection device that operates an air cylinder to move the sealing member. The method for controlling a projection device according to any one of claims 12 to 17.
The specific optical member is a method for controlling a projection device, which is an optical member arranged between the light source and the light modulation element and for equalizing the illuminance distribution of light from the light source. The method for controlling a projection device according to claim 18.
The light modulation element is a liquid crystal panel.
The specific optical member is a method for controlling a projection device that is a fly-eye lens. The method for controlling a projection device according to claim 18.
The light modulation element is an element in which a plurality of movable mirrors are arranged two-dimensionally.
The specific optical member is a method for controlling a projection device that is a rod integrator lens.

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