JP2009069258A - Projection system and control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection system which a user can comfortably use. <P>SOLUTION: The projection system 1 includes a screen 2 provided with a screen state detection means which detects whether a screen main body 21 is in a state of being capable of receiving image light or not, and a projector 3. The projector 3 includes an image projection means 31 for enlarging and projecting formed image light toward the screen 2 and a control means 36 for controlling the operation of the projector 3 on the basis of a detection result of the screen state detection means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projection system and a control method.

Conventionally, light emitted from a light source is modulated according to input image information to form image light, and a projector that magnifies and projects the formed image light, and image light projected from the back side to the front side There is known a rear projector in which a transmissive screen for projection is integrated (for example, see Patent Document 1).
By the way, such a projector and a transmissive screen can be configured as a projection system in which the projector and the transmissive screen are separately provided.

JP 2005-292665 A

  However, when the projection system is configured with the projector and the transmission screen as separate bodies, for example, when the transmission screen is stored, the transmission screen is not interposed between the projector and the user of the projection system. It may be in a state. In such a case, when high-luminance image light is projected from the projector, there is a problem that the high-luminance image light directly hits the user and the user may feel uncomfortable.

  An object of the present invention is to provide a projection system and a control method that can be comfortably used by a user.

  The projection system according to the present invention includes: an image projection unit that modulates light emitted from a light source according to input image information to form image light, and enlarges and projects the formed image light; and the image projection unit A projection system comprising: a projector comprising control means for controlling; and a screen for displaying an image based on the image light by receiving the image light projected by the image projection means, wherein the screen is the image light. Screen state detecting means for detecting whether or not the light can be received, and the control means controls the operation of the projector based on a detection result by the screen state detecting means.

  According to such a configuration, the projection system includes the screen state detection unit, and the projector includes the control unit that controls the operation of the projector based on the detection result by the screen state detection unit. When not in a state where light can be received, the projector can be configured not to operate or the projector can be configured not to project image light. Therefore, in a state where the transmission screen is not interposed with the user of the projection system, high-brightness image light is not projected from the projector, so that the high-brightness image light does not directly hit the user. The user can use the projection system comfortably.

  In the present invention, the projector can input a power supply device for starting or stopping the supply of power to the image projecting means, and supply start information for causing the power supply device to start supplying power. The control means includes: a supply start determination unit that determines whether to start supplying power by the power supply device based on the detection result and the supply start information; and the supply start determination It is preferable that the power supply device includes a power supply control unit that starts power supply when the power supply device determines that the power supply device starts to supply power.

  Here, the power supply device is configured to supply power to the image projection unit with a power supply device different from the power supply device that supplies power to the control unit, for example, based on a control signal from the control unit. The supply of power to the image projection unit may be started or stopped. Further, for example, the power supply device that supplies power to the control means is configured to supply power to the image projection means, and the power supply device is configured to connect or block the path for supplying power to the image projection means. By configuring, the supply of power to the image projection unit may be started or stopped based on a control signal from the control unit. In short, the power supply device only needs to be configured to be able to start or stop the supply of power to the image projection means.

The supply start information is information that is output by pressing a power button provided on an operation unit of a projector such as a remote controller or an operation panel.
In a conventional projector, when a power cable is connected, an operation input from a user is performed in a state where power is supplied only to a control means or a remote controller receiving device (hereinafter referred to as a standby state). When the power button is pressed and supply start information is output to the control means, the power supply apparatus starts supplying power to the image projection means. That is, the projector projects image light when the power button is pressed by an operation input from the user. For this reason, when the power button of the projector is pressed in a state where the transmissive screen is not interposed with the user of the projection system, high brightness image light directly hits the user and the user feels uncomfortable. There is a problem that there are cases.

  However, according to such a configuration, the control unit includes the supply start determination unit and the power supply control unit. Therefore, the power supply to the image projection unit is provided only when the screen is capable of receiving image light. The projector can be configured to start the supply. Therefore, in a state where the transmission screen is not interposed with the user of the projection system, the operation of the projector is controlled, and even when the power button of the projector is pressed, high brightness image light is projected from the projector. Therefore, the image light with high luminance does not directly hit the user, and the user can use the projection system comfortably.

  In the present invention, the control means determines whether to light the light source based on the detection result, and a lighting control for controlling the light source according to the determination result by the lighting determination unit. It is preferable to provide a part.

According to such a configuration, since the control unit includes the lighting determination unit and the lighting control unit, the projector is configured not to turn on the light source when the screen is not in a state where it can receive image light. be able to. According to this, since the high-brightness image light is not projected from the projector in a state where the transmissive screen is not interposed with the user of the projection system, the high-brightness image light directly hits the user. The user can use the projection system comfortably.
In addition, when the screen is in a state where it can receive image light, the projector can be configured to automatically turn on the light source. According to this, the user can project image light to the projector simply by pulling out a screen that can be wound and housed, for example, so as to be able to receive light, so that the projection system can be used more comfortably. be able to.

  In the present invention, the control means determines whether or not to adjust the luminance of the image light based on the detection result, and the image according to the determination result by the luminance adjustment determination unit. It is preferable to include a luminance adjusting unit that adjusts the luminance of light.

Here, the brightness adjusting unit can adjust the brightness of the image light by adjusting the brightness of the emitted light by controlling the light source, for example.
Therefore, according to such a configuration, the control unit includes the luminance adjustment determination unit and the luminance adjustment unit. Therefore, when the screen is not in a state of receiving the image light, the projection of the image light is stopped. Or the projector can be configured to project low-luminance image light. According to this, since the high-brightness image light is not projected from the projector in a state where the transmissive screen is not interposed with the user of the projection system, the high-brightness image light directly hits the user. The user can use the projection system comfortably.

In the present invention, the image projection unit includes a light modulation device that modulates light emitted from the light source according to input image information to form image light, and the luminance adjustment unit includes the light modulation unit. It is preferable to adjust the brightness of the image light by controlling the apparatus.
According to such a configuration, the light modulation device has higher responsiveness than the light source, and therefore the luminance adjustment unit is compared with the case where the luminance of the emitted light is adjusted by controlling the light source. The brightness adjustment of the image light can be performed quickly.

In the present invention, it is preferable that the projector includes a shielding member capable of shielding the image light, and the brightness adjusting unit adjusts the brightness of the image light by controlling the shielding member.
According to such a configuration, the control of the shielding member has high responsiveness compared to the light source, and can prevent the projection member from projecting the image light by the shielding member. The light brightness can be adjusted quickly and reliably.

According to the control method of the present invention, the light emitted from the light source is modulated in accordance with input image information to form image light, and the image projection means that enlarges and projects the formed image light, and the image projection means A projection system control method comprising: a projector including a control unit for controlling; and a screen that displays an image based on the image light by receiving the image light projected by the image projection unit. A screen state detecting unit that detects whether or not the image light can be received; and the projector starts or stops the supply of power to the image projecting unit; and the power supply unit Operating means for enabling input of supply start information for starting supply of power, and the control means includes the screen state detecting means. The supply start determination step for determining whether or not to start the supply of power by the power supply device based on the detection result by the power supply and the supply start information, and the power supply by the power supply device in the supply start determination step When it is determined that the supply of power is started, a power supply control step for causing the power supply device to start supplying power is executed.
According to such a configuration, it is possible to receive the same operational effects as the operational effects of the projection system described above.

According to the control method of the present invention, the light emitted from the light source is modulated in accordance with input image information to form image light, and the image projection means that enlarges and projects the formed image light, and the image projection means A projection system control method comprising: a projector including a control unit for controlling; and a screen that displays an image based on the image light by receiving the image light projected by the image projection unit. Screen state detecting means for detecting whether or not the image light can be received is provided, and the control means determines whether or not to turn on the light source based on a detection result by the screen state detecting means. And a lighting control step for controlling the light source according to a determination result of the lighting determination step. And features.
According to such a configuration, it is possible to receive the same operational effects as the operational effects of the projection system described above.

According to the control method of the present invention, the light emitted from the light source is modulated in accordance with input image information to form image light, and the image projection means that enlarges and projects the formed image light, and the image projection means A projection system control method comprising: a projector including a control unit for controlling; and a screen that displays an image based on the image light by receiving the image light projected by the image projection unit. Screen state detection means for detecting whether or not the image light can be received is provided, and whether or not the control means adjusts the luminance of the image light based on a detection result by the screen state detection means. And a luminance adjustment step for adjusting the luminance of the image light according to the determination result of the luminance adjustment determination step. And executes and-up.
According to such a configuration, it is possible to receive the same operational effects as the operational effects of the projection system described above.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[Schematic configuration of the projection system]
FIG. 1 is a schematic view of the projection system 1 as viewed from the side.
As shown in FIG. 1, the projection system 1 includes a transmissive screen 2 that projects image light projected from the back side to the front side, and modulates light emitted from the light source according to input image information. A projector 3 that forms image light and enlarges and projects the formed image light. The image light enlarged and projected from the projector 3 is projected on the back side of the screen 2, and the screen 2 projects and displays an image based on the projected image light on the front side.

[Detailed configuration of screen]
FIG. 2 is a perspective view of the screen 2 as viewed obliquely from the front.
The screen 2 is provided on the screen main body 21 having flexibility, the screen cover 22 for housing the screen main body 21, and the upper end side (upper side in FIG. 2) of the screen main body 21, and the screen main body 21 is wound by rotating. A take-up shaft 23 to be taken and a screen state detecting means 24 provided on the upper right end side (upper right end side in FIG. 2) of the screen body 21 are provided. The screen cover 22 is fixed to the ceiling of the room as shown in FIG. Moreover, in FIG. 2, the screen cover 22 is seen through for convenience of explanation.

FIG. 3 is a diagram showing details of the screen state detection means 24.
As shown in FIGS. 2 and 3, the screen state detection unit 24 includes a photo interrupter 241 provided on the right end side of the screen cover 22 and an opening 242 formed on the upper right end side of the screen body 21.
The photo interrupter 241 includes a light emitting unit 241A that emits light toward the screen body 21, and a light receiving unit 241B that receives light emitted from the light emitting unit 241A. The light emitting unit 241A and the light receiving unit 241B include the screen body. 21 is sandwiched. The photo interrupter 241 detects the presence or absence of a shielding object interposed between the light emitting unit 241A and the light receiving unit 241B depending on whether or not the light emitted from the light emitting unit 241A is detected by the light receiving unit 241B. Specifically, the photo interrupter 241 continuously outputs an ON signal to the projector 3 by infrared communication when a shielding object is detected and an OFF signal when no shielding object is detected.

The opening 242 is formed at a position that allows light emitted from the light emitting portion 241A of the photo interrupter 241 to pass when the screen body 21 is completely pulled out from the screen cover 22. Therefore, when the screen main body 21 is housed in the screen cover 22 and is not in a state in which image light can be received, the photo interrupter 241 detects the screen main body 21 as a shield, and outputs an ON signal to the projector 3. When the screen main body 21 is completely pulled out from the screen cover 22 and can receive image light, the photo interrupter 241 does not detect the screen main body 21 as a shielding object, so an OFF signal is sent to the projector 3. Output.
That is, the screen state detection unit 24 detects whether or not the screen body 21 is in a state where it can receive image light.

[Detailed configuration of the projector]
FIG. 4 is a block diagram showing the configuration of the projector 3.
As shown in FIG. 4, the projector 3 is roughly configured by an image projection unit 31, a primary power supply device 32, a secondary power supply device 33, an infrared receiver 34, an operation panel 35, and a control unit 36. ing.
The image projection unit 31 modulates light emitted from the light source according to image information to form image light, and enlarges and projects the formed image light toward the screen 2. The image projection unit 31 includes a light source lamp 311, a liquid crystal panel 312, and a projection lens 313.

A light source lamp 311 as a light source is configured by a high-pressure discharge lamp, and emits light toward the liquid crystal panel 312. Instead of the light source lamp 311, various self-luminous elements such as a light emitting diode, a laser diode, and an organic EL element may be used as the light source.
The liquid crystal panel 312 as the light modulation device is a transmissive liquid crystal panel, and changes the arrangement of liquid crystal molecules sealed in a liquid crystal cell (not shown) based on image information, and emits light emitted from the light source lamp 311. Is transmitted or blocked so as to be modulated in accordance with image information to form image light, and this image light is emitted to the projection lens 313.

The projection lens 313 is configured as a combined lens in which a plurality of lenses are housed in a cylindrical lens barrel (not shown), and enlarges and projects image light emitted from the liquid crystal panel 312 toward the screen 2. . An image based on the emitted image light is displayed on the screen body 21 of the screen 2.
Although not shown, the projector 3 includes a color light separation optical device that separates light emitted from the light source lamp 311 into light of three colors of RGB (Red Green Blue). The liquid crystal panel 312 described above is provided corresponding to the three colors RGB separated by the color light separation optical device. Further, the projector 3 includes a combining optical device that combines the three colors of image light to generate image light representing a color image.

The primary power supply device 32 supplies power to the infrared receiver 34, the operation panel 35, and the control means 36 by being connected to an AC (Alternating Current) power supply via a power cable (not shown).
Similar to the primary power supply device 32, the secondary power supply device 33 as a power supply device supplies power to the image projection means 31 by being connected to an AC power supply via a power cable, and is a control means. In response to a control signal from 36, the power supply to the image projection means 31 can be started or stopped.
In this embodiment, the primary power supply device 32 supplies power to the infrared receiver 34, the operation panel 35, and the control means 36, and the power supply by the secondary power supply device 33 is stopped. State.

The infrared receiver 34 receives the ON signal and the OFF signal output from the photo interrupter 241, and outputs the received signal to the control unit 36.
An operation panel 35 as an operation unit is used to perform operations such as activation and adjustment of the projector 3 and includes a power button (not shown) that outputs supply start information to the control unit 36 when pressed. . Instead of the operation panel 35, a remote controller or the like may be used as the operation means.

The control unit 36 includes, for example, a CPU (Central Processing Unit) and controls the operation of the projector 3. The control unit 36 includes a supply start determination unit 361 and a power supply control unit 362.
The supply start determination unit 361 is based on the detection result by the screen state detection unit 24, that is, based on the signal received by the infrared receiver 34 and the supply start information output from the operation panel 35. It is determined whether or not to start supplying power.
The power supply control unit 362 causes the secondary power supply device 33 to start supplying power when the supply start determination unit 361 determines to start supplying power from the secondary power supply device 33.

[Projector control processing]
FIG. 5 is a flowchart showing the control process of the projector 3.
When AC power is connected to the primary power supply device 32 and the secondary power supply device 33, the projector 3 enters a standby state and executes the following control processing.
First, the supply start determination unit 361 determines whether or not to start the supply of power by the secondary power supply device 33 based on the detection result by the screen state detection unit 24 and the supply start information (step S1: supply). Start determination step).
Specifically, the supply start determination unit 361 determines whether supply start information has been output from the operation panel 35, that is, whether the power button has been pressed (step S101: supply start information determination step).

  If supply start information is not output from the operation panel 35, the supply start determination unit 361 executes step S101 again. On the other hand, when supply start information is output from the operation panel 35, the supply start determination unit 361 samples the signal received by the infrared receiver 34 and outputs an ON signal output from the photo interrupter 241. And by acquiring the OFF signal, it is determined whether or not the screen main body 21 can receive the image light (step S102: screen state determination step).

  If the acquired signal is an ON signal, the supply start determination unit 361 determines that the screen body 21 is housed in the screen cover 22 and is not in a state where it can receive image light. In this case, the supply start determination unit 361 executes Step S101 again. On the other hand, when the acquired signal is an OFF signal, the supply start determination unit 361 determines that the screen body 21 is pulled out from the screen cover 22 and can receive image light. In this case, the supply start determination unit 361 determines to start supplying power by the secondary power supply device 33.

When it is determined in the supply start determination step S1 that the secondary power supply 33 starts to supply power, the power supply control unit 362 causes the secondary power supply 33 to start supplying power (step S2: power supply). Control step). Then, image light is projected from the projector 3 by the start of power supply by the secondary power supply device 33.
By executing the above steps S1 to S2, the control process of the projector 3 is executed.

The projection system 1 according to the present embodiment has the following effects.
Even when the operation of the projector 3 is controlled by the control means 36 and the power button of the projector 3 is pressed in a state where the screen main body 21 is not interposed with the user of the projection system 1, the projector 3 has a high brightness. Therefore, the user can comfortably use the projection system 1 without the high-luminance image light being directly applied to the user.

[Second Embodiment]
The projection system 1A according to the second embodiment of the present invention will be described below.
In the following description, parts that have already been described are assigned the same reference numerals and description thereof is omitted.
Whether or not the projector 3 constituting the projection system 1 according to the first embodiment starts the supply of power by the secondary power supply device 33 based on the detection result by the screen state detection unit 24 and the supply start information. Therefore, even when the power button of the projector 3 is pressed in a state where the screen main body 21 is not interposed with the user of the projection system 1, high-luminance image light is projected from the projector 3. It was configured so that it would not.

  On the other hand, the projector 3A constituting the projection system 1A according to the present embodiment determines whether or not to turn on the light source lamp 311 based on the detection result by the screen state detection unit 24, so that the projection system 1A. This is different in that the projector 3 </ b> A is configured not to project high-luminance image light in a state where the screen main body 21 is not interposed with the user.

[Detailed configuration of the projector]
FIG. 6 is a block diagram showing the configuration of the projector 3A.
As shown in FIG. 6, the projector 3A includes an image projection unit 31A and a control unit 36A.
The image projection unit 31A includes a light source driving device 314 that supplies power to the light source lamp 311 and drives the light source lamp 311. The light source driving device 314 supplies power to the light source lamp 311 in accordance with a control signal from the control unit 36A. Is configured to be able to start or stop.

The control unit 36A includes a secondary power supply control unit 363, a lighting determination unit 364, and a lighting control unit 365.
The secondary power supply control unit 363 causes the secondary power supply device 33 to start supplying power based on the supply start information output from the operation panel 35.
The lighting determination unit 364 determines whether to turn on the light source lamp 311 based on the detection result by the screen state detection unit 24.
The lighting control unit 365 controls the light source lamp 311 by outputting a control signal to the light source driving device 314 according to the determination result by the lighting determination unit 364.

[Projector control processing]
FIG. 7 is a flowchart showing the control process of the projector 3A.
When AC power is connected to the primary power supply 32 and the secondary power supply 33, the projector 3A enters a standby state. When the power button is pressed and supply start information is output from the operation panel 35, the secondary power supply control unit 363 causes the secondary power supply device 33 to start supplying power, and the projector 3A performs the following control. Execute the process. In this state, the light source driving device 314 stops supplying power to the light source lamp 311.

First, the lighting determination unit 364 determines whether or not to turn on the light source lamp 311 by sampling the signal received by the infrared receiver 34 and acquiring the ON signal and the OFF signal output from the photo interrupter 241. Determination (step S11: lighting determination step).
When the acquired signal is an ON signal, the screen main body 21 is housed in the screen cover 22 and is not in a state in which image light can be received, so the lighting determination unit 364 determines that the light source lamp 311 is not lit. . In this case, the lighting determination unit 364 executes Step S11 again. On the other hand, when the acquired signal is an OFF signal, the screen main body 21 is pulled out from the screen cover 22 and is in a state where image light can be received, so the lighting determination unit 364 lights the light source lamp 311. Determine that you want to.

When it is determined in the lighting determination step S11 that the light source lamp 311 is to be turned on, the lighting control unit 365 outputs the control signal to the light source driving device 314 to turn on the light source lamp 311 (step S12: lighting control step). . Then, when the light source driving device 314 starts supplying power to the light source lamp 311, image light is projected from the projector 3 </ b> A.
By executing the above steps S11 to S12, the control process of the projector 3A is executed.

The projection system 1A according to the present embodiment has the following effects.
(1) Since the high-luminance image light is not projected from the projector 3A in a state where the screen body 21 is not interposed between the projection system 1A and the user, the high-luminance image light directly hits the user. The user can comfortably use the projection system 1A.
(2) The user can project the image light onto the projector 3A simply by pulling out the screen main body 21 from the screen cover 22 so as to receive light, so that the projection system 1A can be used more comfortably. .

[Third Embodiment]
Hereinafter, a projection system 1B according to a third embodiment of the invention will be described.
The projector 3A constituting the projection system 1A according to the second embodiment controls the light source lamp 311 so that the projector 3A has a high brightness from the projector 3A in a state where the screen main body 21 is not interposed with the user of the projection system 1A. The image light is not projected. In contrast, the projector 3B constituting the projection system 1B according to the present embodiment controls the liquid crystal panel 312 so that the projector 3A does not intervene with the user of the projection system 1A. Are different in that they are configured so as not to project high-luminance image light.

FIG. 8 is a block diagram showing the configuration of the projector 3B.
As shown in FIG. 8, the projector 3B includes a control unit 36B, and the control unit 36B includes a luminance adjustment determination unit 366 and a luminance adjustment unit 367.
The brightness adjustment determination unit 366 determines whether or not to adjust the brightness of the image light based on the detection result by the screen state detection unit 24.
The brightness adjustment unit 367 adjusts the brightness of the image light according to the determination result by the brightness adjustment determination unit 366. Specifically, the luminance adjustment unit 367 causes the liquid crystal panel 312 to block the light emitted from the light source lamp 311 in all the liquid crystal cells when starting the luminance adjustment of the image light projected from the projector 3B. Image information, that is, image information such that an image displayed on the screen main body 21 is an all-black image is adjusted so that the luminance of the image light projected from the projector 3B is lowered.

[Projector control processing]
FIG. 9 is a flowchart showing the control process of the projector 3B.
When AC power is connected to the primary power supply 32 and the secondary power supply 33, the projector 3B enters a standby state. When the power button is pressed and supply start information is output from the operation panel 35, the secondary power supply control unit 363 causes the secondary power supply device 33 to start supplying power, and the projector 3B performs the following control. Execute the process.
First, the brightness adjustment determination unit 366 samples the signal received by the infrared receiver 34 and acquires the ON signal and the OFF signal output from the photo interrupter 241, whereby the image light projected from the projector 3 </ b> B is acquired. It is determined whether or not to adjust the luminance (step S21: luminance adjustment determination step).
Then, the luminance adjustment unit 367 adjusts the luminance of the image light according to the determination result by the luminance adjustment determination unit 366 (step S22: luminance adjustment step).

Specifically, when the signal acquired in the luminance adjustment determination step S21 is an ON signal, the screen main body 21 is housed in the screen cover 22 and is not in a state where it can receive image light, so the luminance adjustment determination unit 366 Determines to adjust the brightness of the image light projected from the projector 3B.
If it is determined in the luminance adjustment determination step S21 that the luminance of the image light projected from the projector 3B is adjusted, the luminance adjustment unit 367 starts luminance adjustment of the image light (step S221: luminance adjustment start step).
When the brightness of the image light is adjusted in the brightness adjustment start step S221, the brightness adjustment determination unit 366 executes step S21 again.

On the other hand, if the signal acquired in the brightness adjustment determination step S21 is an OFF signal, the screen main body 21 is pulled out from the screen cover 22 and can receive image light. The unit 366 determines not to adjust the luminance of the image light projected from the projector 3B.
If it is determined in the luminance adjustment determination step S21 that the luminance of the image light projected from the projector 3B is not adjusted, the luminance adjustment unit 367 stops the luminance adjustment of the image light (step S222: luminance adjustment stop step). Then, by stopping the brightness adjustment of the image light by the brightness adjusting unit 367, high brightness image light is projected from the projector 3B.
By executing the above steps S21 to S22, the control process of the projector 3B is executed.

In this embodiment as well, the same functions and effects as those of the second embodiment can be achieved, and the following functions and effects can also be achieved.
That is, since the liquid crystal panel 312 has higher responsiveness than the light source lamp 311, the brightness adjusting unit 367 quickly adjusts the brightness of the image light projected from the projector 3 </ b> B by controlling the light source lamp 311. can do.

[Fourth Embodiment]
Hereinafter, a projection system 1C according to a fourth embodiment of the present invention will be described.
The projector 3B constituting the projection system 1B according to the third embodiment adjusts the luminance of the image light projected from the projector 3B by controlling the liquid crystal panel 312. On the other hand, the projector 3C constituting the projection system 1C according to the present embodiment includes a lens shutter 37 that shields image light projected from the projection lens 313, and projects from the projector 3C by controlling the lens shutter 37. The difference is that the brightness of the image light is adjusted.

FIG. 10 is a block diagram showing a configuration of the projector 3C.
As shown in FIG. 10, the projector 3 </ b> C includes a control unit 36 </ b> C and a lens shutter 37.
Although not shown, the lens shutter 37 as a shielding member is a non-transparent plate-like member provided on the rear side in the projection direction of the projection lens 313, and slides along the casing of the projector 3C. Thus, the image light projected from the projection lens 313 can be blocked. In addition, a linear actuator (not shown) is connected to the lens shutter 37 so that the lens shutter 37 can be opened and closed based on a control signal output from the control means 36C.

  The control unit 36C includes a luminance adjustment unit 367C. The luminance adjustment unit 367C controls the lens shutter 37 according to the determination result by the luminance adjustment determination unit 366, thereby opening and closing the image light projected from the projector 3C. Adjust the brightness. Specifically, when the luminance adjustment unit 367C starts the luminance adjustment of the image light projected from the projector 3C, the luminance adjustment unit 367C blocks the image light projected from the projection lens 313 by the lens shutter 37, thereby causing the projector 3B to block the image light. Adjust so that no image light is projected.

In this embodiment as well, the same functions and effects as those of the second embodiment can be achieved, and the following functions and effects can also be achieved.
In other words, the control of the lens shutter 37 has higher responsiveness than the light source lamp 311 and can prevent the lens shutter 37 from projecting image light from the projector 3C. The brightness adjustment of the image light projected from 3C can be performed quickly and reliably.

[Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
In each of the embodiments described above, the screen state detection unit 24 is configured by the photo interrupter 241 and the opening 242 formed in the screen main body 21, but may have other configurations. For example, whether a rotary encoder is attached to the end of the winding shaft 23 in the screen 2 and the screen body 21 is in a state capable of receiving image light based on the number of rotations of the winding shaft 23 detected by the rotary encoder. It may be configured to detect whether or not.

  In the first embodiment, the power supply device is composed of a second power supply device different from the first power supply device that supplies power to the control means 36, but the first power supply device supplies power to the image projection means 31. In addition, the power supply device may be configured to connect or block a path for supplying power to the image projection unit 31. In short, the power supply device only needs to be configured to be able to start or stop the supply of power to the image projection means.

  In the third embodiment, the brightness adjusting unit 367 adjusts the brightness of the image light projected from the projector 3B by controlling the liquid crystal panel 312. In the fourth embodiment, the brightness adjusting unit 367C is a lens shutter. Although the brightness of the image light projected from the projector 3C is adjusted by controlling 37, for example, the brightness of the image light projected from the projector may be adjusted by controlling the light source. In short, the brightness adjusting unit only needs to be able to adjust the brightness of the image light projected from the projector.

In each of the above-described embodiments, the screen 2 having a configuration in which the screen cover 22 (the storage portion of the screen main body 21) is fixed to the ceiling (upper side) and the screen main body 21 is pulled out from the upper side to the lower side is employed. On the other hand, a screen having a structure in which the storage portion of the screen main body is fixed to the floor or the like (lower side) and the screen main body is pulled out from the lower side to the upper side may be adopted. Furthermore, a projection system having a configuration in which the storage unit of the screen main body and the projector are integrated may be employed. In short, the projection system only needs to include the projector and the screen.
In each of the above embodiments, the transmissive liquid crystal panel 312 is employed. However, the present invention is not limited to this, and a reflective liquid crystal panel may be employed, or a digital micromirror device (DMD) may be employed. Good. DMD is a trademark of Texas Instruments Incorporated.

  The present invention can be used for a projection system, and in particular, can be suitably used for a projection system using a transmission screen.

The schematic diagram which looked at the projection system in a 1st embodiment from the side. The perspective view which looked at the screen in the said embodiment from diagonally forward. The figure which shows the detail of the screen state detection means in the said embodiment. The block diagram which shows the structure of the projector in the said embodiment. 7 is a flowchart showing projector control processing in the embodiment. The block diagram which shows the structure of the projector in 2nd Embodiment. 7 is a flowchart showing projector control processing in the embodiment. The block diagram which shows the structure of the projector in 3rd Embodiment. 7 is a flowchart showing projector control processing in the embodiment. The block diagram which shows the structure of the projector in 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C ... Projection system, 2 ... Screen, 3, 3A, 3B, 3C ... Projector, 24 ... Screen state detection means, 31, 31A ... Image projection means, 33 ... Secondary power supply (Power supply device , 35... Operation panel (operation means), 36, 36A, 36B, 36C... Control means, 37... Lens shutter (shielding member), 311 ... light source lamp (light source), 312 ... liquid crystal panel (light modulation device), 361 ... supply start determination unit, 362 ... power supply control unit, 364 ... lighting determination unit, 365 ... lighting control unit, 366 ... luminance adjustment determination unit, 367, 367C ... luminance adjustment unit, S1 ... supply start determination step, S2 ... power supply Supply control step, S11 ... lighting determination step, S12 ... lighting control step, S21 ... luminance adjustment determination step, S22 ... luminance adjustment step

Claims (9)

A projector comprising: image projection means for modulating light emitted from a light source in accordance with input image information to form image light, and enlarging and projecting the formed image light; and control means for controlling the image projection means And a screen for displaying an image based on the image light by receiving the image light projected by the image projecting means,
Screen state detecting means for detecting whether the screen is in a state capable of receiving the image light;
The control unit controls the operation of the projector based on a detection result by the screen state detection unit. The projection system according to claim 1,
The projector is
A power supply device for starting or stopping the supply of power to the image projection means;
Operation means enabling input of supply start information for starting the supply of power to the power supply device,
The control means includes
A supply start determination unit that determines whether or not to start supply of power by the power supply device based on the detection result and the supply start information;
A projection system comprising: a power supply control unit configured to start power supply to the power supply device when the power supply determination device determines that the power supply device starts to supply power. The projection system according to claim 1,
The control means includes
A lighting determination unit that determines whether to light the light source based on the detection result;
A projection system comprising: a lighting control unit that controls the light source according to a determination result by the lighting determination unit. The projection system according to claim 1,
The control means includes
A luminance adjustment determination unit that determines whether or not to adjust the luminance of the image light based on the detection result;
A projection system comprising: a luminance adjustment unit that adjusts the luminance of the image light according to a determination result by the luminance adjustment determination unit. The projection system according to claim 4,
The image projecting means
A light modulation device that modulates light emitted from the light source according to input image information to form image light;
The brightness adjusting unit adjusts the brightness of the image light by controlling the light modulation device. The projection system according to claim 4,
The projector is
A shielding member capable of shielding the image light;
The brightness adjusting unit adjusts the brightness of the image light by controlling the shielding member. A projector comprising: image projection means for modulating light emitted from a light source in accordance with input image information to form image light, and enlarging and projecting the formed image light; and control means for controlling the image projection means A screen for displaying an image based on the image light by receiving the image light projected by the image projection means,
Screen state detecting means for detecting whether the screen is in a state capable of receiving the image light;
The projector is
A power supply device for starting or stopping the supply of power to the image projection means;
Operation means enabling input of supply start information for starting the supply of power to the power supply device,
The control means is
A supply start determination step for determining whether to start the supply of power by the power supply device based on the detection result by the screen state detection means and the supply start information;
When it is determined in the supply start determination step that power supply by the power supply device is started, a power supply control step for causing the power supply device to start supplying power is executed. . A projector comprising: image projection means for modulating light emitted from a light source in accordance with input image information to form image light, and enlarging and projecting the formed image light; and control means for controlling the image projection means A screen for displaying an image based on the image light by receiving the image light projected by the image projection means,
Screen state detecting means for detecting whether the screen is in a state capable of receiving the image light;
The control means is
A lighting determination step for determining whether to light the light source based on a detection result by the screen state detection means,
And a lighting control step of controlling the light source according to a determination result of the lighting determination step. A projector comprising: image projection means for modulating light emitted from a light source in accordance with input image information to form image light, and enlarging and projecting the formed image light; and control means for controlling the image projection means A screen for displaying an image based on the image light by receiving the image light projected by the image projection means,
Screen state detecting means for detecting whether the screen is in a state capable of receiving the image light;
The control means is
A luminance adjustment determination step for determining whether to adjust the luminance of the image light based on a detection result by the screen state detection unit;
A control method comprising: executing a brightness adjustment step of adjusting the brightness of the image light according to a determination result obtained by the brightness adjustment determination step.

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