JP2016167015A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector that can suppress interruption of image projection.SOLUTION: A projector comprises: an illuminating device 31; a light modulator 34 that modulates light emitted from the illuminating device 31; a projection optical device 35 that projects light modulated by the light modulator 34; and a control device 7 that controls lighting of the illuminating device 31. The illuminating device 31 includes a plurality of light source devices 32 (32A to 32D) each including an arc tube emitting light, and the control device 7 individually controls the respective lighting states of the arc tubes included in the plurality of light source devices 32 (32A to 32D).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a projector.

2. Description of the Related Art Conventionally, there is known a projector that modulates light emitted from a light source to form an image according to image information and enlarges and projects the image on a projection surface such as a screen.
In recent years, the use of projectors has been diversified, and there has been an increasing demand for higher brightness of projected images. On the other hand, a projector including a plurality of light source devices has been proposed (see, for example, Patent Document 1).
The projector described in Patent Document 1 includes two light source devices each having a light source such as an ultrahigh pressure mercury lamp, and a reflector that reflects light incident from these light source devices. The light reflected by the reflector is modulated by a liquid crystal panel via various optical components and projected by a projection lens.

JP 2010-19954 A

By the way, in a projector provided with a plurality of light source devices such as the projector described in Patent Document 1, each light source device is lit to have substantially the same luminance (output). For example, when the light source device is turned on with high brightness, all the light source lamps (light emitting tubes) included in the light source device are turned on with high brightness. When the light source device is turned on with low brightness, all the light source lamps have low brightness. Illuminated. In this way, when all the light source lamps of the projector are in the same lighting state, when each light source lamp is of the same type, each light source lamp reaches the end of its life almost simultaneously and image projection can be performed. There is a problem that it cannot be done.
In particular, when such projectors are used for large-scale presentations, projection mapping, etc., the use of the projectors in these scenes may be interrupted, causing great damage to the user. .

  An object of the present invention is to solve at least a part of the above-described problems, and an object of the present invention is to provide a projector capable of continuing image projection.

  A projector according to an aspect of the present invention includes an illumination device, a light modulation device that modulates light emitted from the illumination device, a projection optical device that projects light modulated by the light modulation device, and the illumination device. A control device that controls the lighting of the light source, and the lighting device includes a plurality of light source devices each having an arc tube that emits light, and the control device includes each of the arc tubes included in the plurality of light source devices. The lighting state of each is controlled individually.

According to the above-described aspect, it is possible to turn on the light-emitting tubes of each light source device so that the life of at least one light-emitting tube is longer than the life of other light-emitting tubes. Can be shifted. Accordingly, it is possible to prevent the light emitting tubes from reaching the end of their life and to be turned off at the same time, and even when one of the light emitting tubes reaches the end of its life, image projection can be continued with the light emitted from the other light emitting tubes.
In addition, since the lighting state of each arc tube can be individually controlled in this way, the amount of light emitted from each arc tube can be adjusted, and as a result, the light modulation is compared with the case where each light source device is lit in the same lighting state. The amount of light applied to the device can be finely adjusted. Therefore, the brightness of the projected image can be finely adjusted.

In the above aspect, the control device may have a second life mode in which the life of the arc tube is longer than the lighting mode of the at least one light source device among the plurality of light source devices in the first life mode. And the lighting mode setting unit for setting the lighting mode of the other light source device to the first life mode, and the plurality of light source devices according to the lighting mode set by the lighting mode setting unit. It is preferable to have an operation control unit that controls the lighting state of each arc tube.
According to the above aspect, the operation control unit controls the lighting state of each arc tube of the plurality of light source devices according to the lighting mode set by the lighting mode setting unit. And the said lighting mode setting part sets the lighting mode of at least 1 light source device to the said 2nd lifetime mode, and sets the lighting mode of another light source device to the said 1st lifetime mode. According to this, the lighting state of each arc tube can be controlled so that the lifetime of the arc tube included in the at least one light source device is longer than the lifetime of arc tubes included in the other light source devices. Therefore, it is possible to suppress the lifetime of each arc tube at the same time, and image projection can be continued.

In the above-described aspect, the light source device includes a plurality of lighting circuits that are provided according to each of the plurality of light source devices and turn on the corresponding light source device among the plurality of light source devices according to the set lighting mode. When the lighting mode of the corresponding light source device is the second life mode, the plurality of lighting circuits light the light emitting tube of the light source device with low luminance, and the lighting mode of the corresponding light source device is In the case of the first life mode, it is preferable that the arc tube included in the light source device is lit with high brightness.
Here, the life of the arc tube tends to be longer when the arc tube is lighted with low brightness than when the arc tube is lighted with high brightness.
On the other hand, in the above aspect, the light emitting tube of the light source device whose lighting mode is the second lifetime mode is lit with low brightness by the lighting circuit, and the lighting mode of the light source device whose lighting mode is the first lifetime mode is The arc tube is lit with high brightness. According to this, the lifetime of the luminous tube of the light source device that is turned on in the second lifetime mode can be reliably extended from the lifetime of the luminous tube of the light source device that is lit in the first lifetime mode. Therefore, it is possible to surely prevent the arc tubes from reaching the end of their lives at the same time, and to reliably continue image projection. Moreover, since the lighting circuit is provided according to each light source device, the lighting state of each arc tube included in each light source device can be reliably controlled individually.

In the above aspect, it is preferable that the plurality of lighting circuits change power supplied to the corresponding arc tube in accordance with the lighting mode.
Here, the voltage applied to the arc tube changes according to the deterioration state of the arc tube. For this reason, it is difficult to change the lighting state of the arc tube according to the lighting mode by changing the voltage applied to the arc tube.
On the other hand, in the said one aspect | mode, by changing the electric power (electric current) supplied to an arc_tube | light_emitting_tube, it can switch with the case where an arc_tube | light_emitting_lamp is made to light with high intensity | strength, and the case where it makes it light with low intensity, The lighting state of the arc tube can be controlled. Therefore, it is possible to more surely suppress the arc tubes from reaching the end of their lives at the same time, and to continue image projection more reliably.

In the one aspect, the control device includes a remaining life calculation unit that calculates a remaining life time of the arc tube included in the plurality of light source devices, and the lighting mode setting unit includes the remaining life time of a predetermined time or less. In this case, it is preferable to set the lighting mode of the at least one light source device to the second life mode.
According to the above aspect, when the remaining life time of the arc tube becomes a predetermined time or less, the lighting mode of at least one light source device among the plurality of light source devices is set to the second life mode. According to this, until the remaining lifetime becomes a predetermined time or less, the lighting mode of each light source device can be set to the first lifetime mode so that the light emitting tube of each light source device can be lit with high brightness. Accordingly, since a high amount of light can be emitted from the illumination device having each light source device, a high-luminance image can be projected.

  In the one aspect, an exterior casing that configures an exterior and an attitude detection device that detects an attitude of the exterior casing are provided, and each of the plurality of light source devices is incident on the arc tube and the arc tube And a reflecting mirror having a concave curved reflecting surface for reflecting light, wherein the arc tube extends from one end of the light emitting unit, and the reflecting mirror is fixed. And the control device is configured such that the light emission direction from at least one light source device among the plurality of light source devices is downward in the vertical direction based on a detection result by the posture detection device. A posture determination unit that determines whether or not the outer casing is disposed so as to be in a posture disposed in the lighting device, and the lighting mode setting unit sets a lighting mode of the at least one light source device to the second When setting the life mode, When it is determined by the force determination unit that the outer casing is arranged in the posture, the lighting mode of the light source device in which the light emission direction is downward in the vertical direction among the plurality of light source devices is prioritized. Preferably, the second life mode is set.

Here, in the light source device in which the light emission direction is downward in the vertical direction, the reflecting mirror fixed to the sealing portion of the arc tube is arranged to face downward in the vertical direction. In this case, the heat generated in the light emitting part having the highest temperature in the arc tube tends to stay in the reflecting mirror that covers at least a part of the light emitting part. In such a state, the light emitting unit is hardly cooled, deterioration of the light emitting unit (deterioration of electrodes disposed in the light emitting unit, etc.) is likely to proceed, and the life of the arc tube is shortened.
On the other hand, according to the above aspect, when it is determined by the attitude determination unit that the exterior housing is arranged so that the light emission direction from the at least one light source device is in the vertical downward direction, The lighting mode setting unit preferentially sets the lighting mode of the light source device in which the light emission direction is downward in the vertical direction to the second life mode. According to this, the lighting mode of the light source device having the light emitting tube in the arrangement state in which the deterioration is likely to occur is set to the second life mode, so that the temperature rise of the light emitting unit can be suppressed and the deterioration of the light source device can be suppressed. it can. Therefore, it can suppress that the lifetime of a light source device is shortened from assumption.

1 is a schematic perspective view showing a projector according to an embodiment of the invention. The block diagram which shows the internal structure of the projector in the said embodiment. The figure which shows the structure of the light source device in the said embodiment. The figure which shows arrangement | positioning of the light source device in the said embodiment. The block diagram which shows the structure of the control apparatus in the said embodiment. The flowchart which shows the lighting control processing in the said embodiment. The figure which shows the transition timing of the lighting mode in the said embodiment, and transition of remaining lifetime.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Schematic configuration of projector]
FIG. 1 is a schematic perspective view showing a projector 1 according to this embodiment.
The projector 1 according to the present embodiment modulates light emitted from the lighting device to form an image according to image information, and enlarges and projects the image on a projection surface such as a screen.
As will be described in detail later, the projector 1 individually controls the lighting state of each light source device according to the cumulative lighting time and remaining life time of the arc tube included in each of the plurality of light source devices. Has a function of suppressing the end of life at the same time. As shown in FIG. 1, such a projector 1 includes an exterior casing 2 that constitutes an exterior.

The exterior housing 2 is formed in a substantially rectangular parallelepiped shape having a top surface portion 21, a bottom surface portion 22, a front surface portion 23, a back surface portion 24, and left and right side surface portions 25 and 26.
Among these, the top surface portion 21 is provided with a pair of grips 211 used when the user holds the projector 1 or fixes the projector 1 to an appliance installed on a ceiling or the like. In addition, the top surface portion 21 is formed with an opening (not shown) for accommodating a light source device 32 (32A to 32D), which will be described later, in the exterior housing 2 in a replaceable manner. Covered by.
Although not shown in the drawings, the bottom surface portion 22 is provided with leg portions that come into contact with the installation surface when placed on an installation surface such as an installation table.
The front portion 23 is formed with an opening 231 through which a part of a projection optical device 35 constituting the image forming apparatus 3 described later is exposed.
In the following description, the direction along the central axis of the light emitted from the projection optical device 35 and along the traveling direction of the light is defined as the Z direction. Of the two directions orthogonal to the Z direction and orthogonal to each other, the direction from the bottom surface portion 22 to the top surface portion 21 is defined as the Y direction, and the direction from the left side surface portion 25 toward the right side surface portion 26 is defined as the X direction. . For example, when the projector 1 is arranged so that the bottom surface portion 22 is along the horizontal plane, the X direction and the Z direction are along the horizontal direction, and the Y direction is along the upward direction in the vertical direction.

[Internal configuration of projector]
FIG. 2 is a block diagram showing an internal configuration of the projector 1 according to the present embodiment.
In addition to the outer casing 2, the projector 1 is provided in the outer casing 2, as shown in FIG. 2, the image forming apparatus 3, the lighting device 4, and the control device 7 housed in the outer casing 2. An input device 5 and an attitude detection device 6.

[Configuration of Image Forming Apparatus]
The image forming apparatus 3 forms and projects an image according to image information (including an image signal) input from the control device 7 under the control of the control device 7 described later. Such an image forming apparatus 3 includes an illumination device 31, a light modulation device 34, and a projection optical device 35. In addition, although not shown, the image forming apparatus 3 is incident on a homogenizer that uniformizes an illuminance distribution (luminance distribution) in a plane perpendicular to the central axis of the light emitted from the illumination device 31. A polarization conversion device that aligns the polarization direction of the light, a color separation device that separates red, green, and blue color light from the light with uniform illumination distribution, and a color synthesis device.

Among these, the light modulation device 34 modulates light incident from the illumination device 31 through the homogenization device, the polarization conversion device, and the color separation device, and forms an image according to the image information. In this embodiment, the light modulation device 34 is provided according to each color light separated by the color separation device, and forms an image of each color light. These images are synthesized by a color synthesizer configured by a dichroic prism or the like. As such a light modulation device 34, a transmission type and a reflection type liquid crystal panel can be exemplified, and a device using a micromirror, for example, a light modulation device other than liquid crystal such as DMD (Digital Micromirror Device) can be adopted.
The projection optical device 35 enlarges and projects the image formed by the light modulation device 34 and synthesized by the color synthesis device onto the projection surface. Although not shown, the projection optical device 35 can be exemplified by a combined lens having a lens barrel and a plurality of lenses housed and arranged in the lens barrel.

[Configuration of light source device]
FIG. 3 is a diagram illustrating a configuration of the light source device 32.
The illuminating device 31 includes a plurality of light source devices 32 and a light combining device 33 (see FIG. 4) that combines light emitted from the light source devices. In the present embodiment, the illumination device 31 includes four light source devices 32 (32A to 32D).
As shown in FIG. 3, each light source device 32 includes a light source lamp 321 that emits light, a main reflecting mirror 324, a parallelizing concave lens 325, and a storage body 326 that stores and arranges these.

The light source lamp 321 includes an arc tube 322 and a sub-reflecting mirror 323.
The arc tube 322 includes a substantially spherical light emitting portion 3221 that emits light by lamp power supplied from a lighting circuit 41 of the lighting device 4 described later, and a pair of sealing portions that extend in opposite directions from both ends of the light emitting portion 3221. 3222, 3223.
In the pair of sealing portions 3222 and 3223, although not shown, metal foils and lead wires that are electrically connected to the electrodes in the light emitting portion 3221 are disposed. Among these, the sub-reflecting mirror that covers the emission direction side of the light emitting unit 3221 and reflects the incident light on the sealing unit 3223 positioned on the emission direction side of the light from the light source device 32 from the light emitting unit 3221. H.323 is provided. In addition, a main reflecting mirror 324 is provided in a sealing portion 3222 located on the opposite side of the light emitting portion 3221 with respect to the sealing portion 3223.
Such an arc tube 322 is an arc tube of the same type in each light source device 32. That is, the arc tube 322 included in each light source device 32 is an arc tube that lights with substantially the same brightness when the same lamp power is supplied and has approximately the same lifetime.
In addition, each light source device 32 is provided in the said exterior housing | casing 2 so that replacement | exchange is possible, The cover member 212 (refer FIG. 1) provided in the exterior housing 2 is removed, and a light source storage part (illustration omitted) is carried out. By exposing, each light source device 32 can be individually replaced in the light source storage section.

The main reflecting mirror 324 is a reflecting mirror having a concave curved reflecting surface 3241 that reflects and converges incident light, and the light emitting unit 3221 is located in the main reflecting mirror 324. In this embodiment, the main reflecting mirror 324 is configured by an elliptical reflector having a rotating ellipsoidal surface, but may be configured by a parabolic reflector having a rotating parabolic surface, or by a free-form curved reflector. May be.
The collimating concave lens 325 collimates the light beam converged by the main reflecting mirror 324.

The storage body 326 includes a light source lamp 321 and a main reflection mirror 324 inside, and a storage body main body 3261 that supports the collimating concave lens 325 and a duct 3262.
Of these, the duct 3262 is not shown, but is attached to the housing body 3261, and the air introduced from the outside of the housing body 326 by the outer surface of the housing body 3261 and the inner surface of the duct 3262. A duct portion that is circulated and led to the arc tube 322 in the housing body 3261 is formed.
Lamp power is supplied from the corresponding lighting circuit 41 in the lighting device 4 to the arc tube 322 of each light source device 32 having such a configuration, whereby light is emitted from each light source device 32.

[Arrangement of light source device]
FIG. 4 is a diagram showing an arrangement of the light source device 32 in the projector 1.
Here, the light source devices 32A to 32D are divided into a pair of light source devices 32 facing each other. For example, as illustrated in FIG. 4, the light source device 32 </ b> A and the light source device 32 </ b> B are arranged to face each other with the photosynthesis device 33 interposed therebetween, and the light source device 32 </ b> C and the light source device 32 </ b> D are not illustrated. It is arranged to face each other across the.
In other words, the light emission direction by the light source device 32A and the light emission direction by the light source device 32B are opposite to each other, and the light emission direction by the light source device 32C and the light emission direction by the light source device 32D are: The directions are opposite to each other. In the present embodiment, the light source devices 32A and 32C are arranged such that the light emission direction is along the direction opposite to the X direction, and the light source devices 32B and 32D are such that the light emission direction is along the X direction. Be placed.

  When the projector 1 in which the light source device 32 is arranged in this manner is installed in a horizontal posture in which the top surface portion 21 and the bottom surface portion 22 are along a horizontal plane, the light emission direction of the light source devices 32A and 32C is horizontal. The light emission direction by the light source devices 32B and 32D is opposite to the one direction in the horizontal direction. In this case, since the opening direction of the main reflecting mirror 324 included in each light source device 32 is one direction side in the horizontal direction or the opposite side to the one direction, the light emitting unit 3221 located inside the main reflecting mirror 324 is used. The generated heat is easily discharged from the inside of the main reflecting mirror 324.

On the other hand, when the projector 1 is installed in the vertical orientation in which the left side surface portion 25 and the right side surface portion 26 are along the horizontal plane, the light emission direction by the light source devices 32A and 32C is one direction in the vertical direction. The light emission direction by 32B and 32D is opposite to the one direction in the vertical direction. In this case, the opening direction of the main reflecting mirror 324 included in each light source device 32 is one direction side in the vertical direction or the opposite side to the one direction. For this reason, in the light source device 32 positioned on the lower side in the vertical direction, since the opening direction of the main reflecting mirror 324 faces upward, the light generated in the light emitting unit 3221 positioned on the inner side of the main reflecting mirror 324 is tinged. The air easily flows upward in the vertical direction, and is easily discharged from the inside of the main reflecting mirror 324. However, in the light source device 32 positioned on the upper side in the vertical direction, since the opening direction of the main reflecting mirror 324 faces downward, the light generated by the light emitting unit 3221 positioned on the inner side of the main reflecting mirror 324 is tinged. Air tends to go inside the main reflector 324. Therefore, when the projector 1 is installed in such a vertical orientation, the temperature of the arc tube 322 (light emitting unit 3221) of the upper light source device 32 in the vertical direction is likely to rise, and deterioration is likely to be promoted. .
Such an attitude of the projector 1 is detected by an attitude detection device 6 described later.

[Configuration of lighting device]
Returning to FIG. 2, the lighting device 4 is a device that supplies lamp power to the luminous tubes 322 of the respective light source devices 32 (32 </ b> A to 32 </ b> D) to light the luminous tubes 322. The lighting device 4 includes a plurality of lighting circuits 41 (41 </ b> A to 41 </ b> D) provided according to each light source device 32. Then, the lighting circuits 41A to 41D supply the lamp power individually to the corresponding light source devices 32 among the light source devices 32A to 32D. As such lamp power, the lighting circuit 41 emits the lamp tube 322 with high brightness and emits light with a short life / high brightness mode for increasing the amount of emitted light and the lamp tube 322 with low brightness. One of the long-life / low-luminance mode lamp power for reducing the amount of light is supplied to the arc tube 322 of the corresponding light source device 32. Among these, the lamp power for the short life / high brightness mode is higher than the lamp power for the long life / low brightness mode.
The lamp power supplied by the lighting circuit 41 is determined according to the lighting mode set for each light source device 32 by the control device 7 described later.
Note that the short life / high brightness mode (first life mode) referred to here means that the life is shortened compared to the case of lighting in the above-mentioned long life / low brightness mode (second life mode), and This means a mode in which the light emission luminance is increased, and is not a mode for shortening the light source device to the expected life or less (a mode for shortening the life from the assumed life). Specifically, the short life / high luminance mode is a lighting mode in which when the arc tube 322 is turned on in the mode, the arc tube 322 reaches the end of its life when the cumulative lighting time reaches the assumed life time. The long life / low luminance mode is a lighting mode in which when the arc tube 322 is lit in the mode, the arc tube 322 reaches the end of life when the cumulative lighting time reaches a predetermined time longer than the assumed lifetime. is there. For this reason, the long life / low luminance mode is a lighting mode in which the life of the arc tube 322 is longer than that in the short life / high luminance mode.

[Configuration of Input Device and Attitude Detection Device]
The input device 5 accepts an input operation by the user and outputs an operation signal corresponding to the input operation to the control device 7. Although not shown, the input device 5 has an operation panel having a plurality of buttons arranged on the outer surface (for example, the top surface portion 21) of the exterior housing 2 and a plurality of buttons that are the same as the plurality of buttons. Consists of having a remote controller.
The posture detection device 6 includes an acceleration sensor and a gyro sensor, detects the posture of the projector 1 (exterior housing 2), and outputs the detection result to the control device 7. Based on the detection result by the posture detection device 6, the control device 7 determines the posture of the projector 1.

[Configuration of control device]
FIG. 5 is a block diagram illustrating a configuration of the control device 7.
The control device 7 includes a processing device such as a CPU (Central Processing Unit) and a storage device such as a flash memory, and is based on the operation signal input in response to an input operation by a user or autonomously. The operation of the projector 1 is controlled. For example, the control device 7 decodes image information input from the outside as necessary, outputs an image signal (drive signal) corresponding to the image information to the light modulation device 34, and outputs the image forming device. 3 forms and projects an image according to the image information. The control device 7 controls the operation of the projector 1 according to the operation mode set by the user. The operation of the projector 1 includes control of the lighting device 4 that turns on the light source device 32, that is, lighting control of the light source device 32.
As shown in FIG. 5, such a control device 7 includes a storage unit 71 configured by the storage device, and a lighting time realized by the processing device processing the program stored in the storage unit 71. The timer unit 72 includes an operation mode setting unit 73, a remaining life calculation unit 74, a time determination unit 75, a time update unit 76, an attitude determination unit 77, a lighting mode setting unit 78, an operation control unit 79, and a notification unit 80.

The storage unit 71 stores various programs and data necessary for the operation of the projector 1. For example, the storage unit 71 stores a lighting control program for controlling the lighting of the light source devices 32. Further, for example, the storage unit 71 stores the estimated life time of each light source device 32 and also stores the cumulative lighting time of each light source device 32 measured by the lighting time timer 72. The estimated lifetime of the light source device 32 may be stored in advance for each type of the light source device 32 (the arc tube 322), or may be acquired from the mounted light source device 32 and stored.
The lighting time timer 72 measures the cumulative lighting time of each light source device 32. Specifically, the lighting time measuring unit 72 counts up the cumulative lighting time of each light source device 32 stored in the storage unit 71 while the corresponding light source device 32 is turned on.

The operation mode setting unit 73 sets the operation mode of the projector 1 based on the operation signal input from the input device 5. Such an operation mode setting operation is performed by the user on an OSD (On Screen Display) menu screen displayed on the projection surface.
Specifically, the operation mode setting unit 73 sets the operation mode of the projector 1 to the luminance priority mode when an operation signal for setting the luminance priority mode for lighting all of the light source devices 32 is input. Further, the operation mode setting unit 73 sets the operation mode of the projector 1 to the power saving mode when an operation signal for setting the power saving mode (eco mode) for suppressing the power consumption of each light source device 32 is input. Furthermore, the operation mode setting unit 73 sets the operation mode of the projector 1 to the life extension mode when an operation signal for setting the life extension mode for extending the life of each light source device 32 is input.

Among these, in the life extension mode, the light emitting tubes 322 of the respective light source devices 32 reach the end of life almost simultaneously, and the respective light source devices 32 cannot be turned on almost simultaneously, so that the projector 1 cannot be used for presentations or the like. This is a mode to prevent.
When this life extension mode is set, each light source device 32 is turned on with high brightness until the remaining life time becomes a predetermined time or less. On the other hand, if there is a light source device 32 whose remaining lifetime is less than or equal to a predetermined time, the light source device 32 is turned on with low brightness, the lifetime of the light source device 32 is extended, and all the light source devices 32 reach the lifetime at the same time. prevent.
When such a life extension mode is set, the remaining life calculation unit 74, the time determination unit 75, the time update unit 76, and the posture determination unit 77 described below function.

The remaining life calculation unit 74 is configured to store the light source devices 32 based on the estimated life time and cumulative lighting time of each light source device 32 stored in the storage unit 71 and the lighting state transition of each light source device 32. Calculate the remaining life time.
Here, the lifetime of the arc tube 322 varies depending on the lamp power supplied to the arc tube 322. For example, in the case where the maximum lamp power is continuously supplied to the arc tube 322 and the minimum lamp power is continuously supplied to the arc tube 322 in the range of the lamp power allowed by the arc tube 322, the former one is used. However, the amount of light emitted from the arc tube 322 becomes larger, but the latter has a longer lifetime. That is, when the luminous tube 322 is lighted with high luminance, the life is short, and when lighted with low luminance, the life is long.
For this reason, the remaining life calculation unit 74 is based on the assumed life time and cumulative lighting time of the light source device 32 having the arc tube 322 stored in the storage unit 71 and the transition of the lighting state of the arc tube 322. Then, the remaining life time of the arc tube 322 (remaining life time of the light source device 32) in the case of lighting with high brightness is calculated.

  The time determination unit 75 determines whether or not the remaining life time calculated by the remaining life calculation unit 74 is equal to or shorter than a switching time that is a predetermined time. In other words, the time determination unit 75 determines whether there is a light source device 32 whose remaining lifetime is equal to or shorter than the switching time. Such switching time can be set as appropriate. For example, the switching time can be set to a value of a predetermined ratio of the assumed life time when the light source device 32 is turned on with high luminance. Note that the time determination unit 75 determines that the remaining life time is equal to or shorter than the switching time, and the light source device 32 whose lighting mode is changed to the long life / low luminance mode by the lighting mode setting unit 78 to be described later is time determination. It is excluded from the determination process by the unit 75.

When it is determined that there is a light source device 32 whose remaining lifetime is equal to or shorter than the switching time, the time updating unit 76 sets the switching time to a value smaller than the current switching time.
In the present embodiment, when the switching time is half the estimated life time, the time update unit 76 subtracts the quotient obtained by dividing the half time by the number of light source devices 32 from the switching time. Time to be used as a new switching time.
For example, when the assumed life time when the luminous tube 322 is lit with high brightness is 10,000 hours, the initial switching time (the first switching time) is set to 5000 hours. Then, when the remaining lifetime reaches the switching time, the switching time is updated. However, since there are four light source devices 32 in the switching time after the update (switching time for the second setting), A value (3750 hours) obtained by subtracting the quotient (1250 hours) obtained by dividing the initial switching time (5000 hours) by 4 that is the number of light source devices 32 is set from the initial switching time (5000 hours). The Similarly, a value (2500 hours) obtained by subtracting the quotient (1250 hours) from 3750 hours is set as the switching time after updating (switching time for the third setting), and the switching after the next update is performed. The time (fourth switching time) is set to 1250 hours obtained by subtracting the quotient from the third switching time.
The update of the switching time by the time updating unit 76 is executed when the remaining lifetimes of all the light source devices 32 when the operation mode of the projector 1 is set to the lifetime extension mode are the same. That is, the update of the switching time is executed when all the light source devices 32 are mounted at the same timing and are used in the same lighting state. On the other hand, when the remaining lifetimes of the respective light source devices 32 are different, the switching time update process is not executed, and the initial switching time is maintained.

  The attitude determination unit 77 determines the attitude of the projector 1 based on the detection result by the attitude detection device 6. Specifically, in the posture determination unit 77, the projector 1 is installed such that the light emission direction of at least one light source device 32 among the light source devices 32A to 32D is in a vertical downward direction (for example, a vertical posture). It is determined whether or not it has been done.

The lighting mode setting unit 78 sets the lighting mode of each light source device 32, and thereby sets the lamp power supplied to the corresponding arc tube 322 by the lighting circuit 41.
For example, when the operation mode of the projector 1 is the luminance priority mode, the lighting mode setting unit 78 sets all the lighting modes of the light source devices 32A to 32D to the short life / high luminance mode, and the operation mode is the power saving mode. In this case, all the lighting modes of the light source devices 32A to 32D are set to the long life / low luminance mode.

In addition, when the operation mode of the projector 1 is the life extension mode, the lighting mode setting unit 78 sets the lighting mode of all the light source devices 32A to 32D to the short life / high luminance mode, and then determines the time determination unit 75. While it is determined that there is no light source device 32 whose remaining lifetime is equal to or shorter than the switching time, the lighting modes of the light source devices 32A to 32D are maintained.
On the other hand, it is determined by the time determination unit 75 that there is at least one light source device 32 whose remaining lifetime is equal to or shorter than the switching time, and further, the posture determination unit 77 does not indicate that the posture of the projector 1 is the vertical posture. When determined, the lighting mode setting unit 78 selects at least one lighting mode from among the light source devices 32 set to the short life / high luminance mode among the light source devices 32 whose remaining lifetime is equal to or shorter than the switching time. Is set to the long life / low luminance mode.
On the other hand, it is determined by the time determination unit 75 that there is at least one light source device 32 whose remaining lifetime is equal to or shorter than the switching time, and the lighting mode setting unit 78 is further configured by the attitude determination unit 77 to perform the attitude of the projector 1. Is determined to be in the vertical orientation, the lighting mode setting unit 78 selects the light source device 32 that is set to the short life / high luminance mode among the light source devices 32 whose remaining lifetime is equal to or shorter than the switching time. From the inside, at least one lighting mode of the light source device 32 in which the light emission direction is vertically downward is preferentially switched to the long life / low luminance mode.

  The switching process of the lighting mode by the lighting mode setting unit 78 is performed every time when the time determination unit 75 determines that the light source device 32 whose remaining lifetime is equal to or shorter than the switching time appears. Note that, as described above, the light source device 32 whose lighting mode has been changed to the long life / low luminance mode is not subject to determination processing by the time determination unit 75, and therefore the switching time is updated and the remaining life time Even if the switching time after the update is exceeded, the lighting mode of the light source device 32 that has been changed to the long life / low luminance mode is not changed to the short life / high luminance mode.

The operation control unit 79 controls various operations of the projector 1. For example, the operation control unit 79 controls the operation of the corresponding lighting circuit 41 so that the light source device 32 is lit in the lighting mode set by the lighting mode setting unit 78.
Specifically, when the lighting mode of a certain light source device 32 is the short life / high luminance mode, the operation control unit 79 provides a short circuit to the lighting circuit 41 that supplies lamp power to the arc tube 322 of the light source device 32. Lamp power is supplied according to the life / high brightness mode. On the other hand, when the lighting mode of a certain light source device 32 is the long life / low luminance mode, the operation control unit 79 supplies lamp power (short life / high luminance) corresponding to the long life / low luminance mode to the corresponding lighting circuit. Lamp power lower than the lamp power corresponding to the brightness mode) is supplied.
Accordingly, the light source device 32 (the arc tube 322) is turned on according to the set lighting mode.

  The notification unit 80 notifies various information to the user of the projector 1. For example, the notification unit 80 needs to replace the light source device 32 when one of the light source devices 32A to 32D is turned off due to the lifetime or when one light source device 32 is not turned off due to the lifetime. Messages and voices are output. Note that the message prompting the replacement of the light source device 32 may be notified at any timing, or may be notified at a timing other than the above.

[Lighting control processing]
FIG. 6 is a flowchart showing a lighting control process executed by the control device 7.
The arithmetic processing unit constituting the control device 7 reads the lighting control program stored in the storage unit 71 and executes the lighting control process shown below. This lighting control process is executed when the remaining lifetimes of the light source devices 32A to 32D are all the same and the operation mode of the projector 1 is switched to the lifetime extension mode.
In this lighting control process, as shown in FIG. 6, first, the remaining life calculation unit 74 calculates the remaining life time of each of the light source devices 32A to 32D (step S1).
Thereafter, the time determination unit 75 determines whether there is a light source device 32 whose remaining lifetime is equal to or shorter than the switching time (step S2). At this time, the time determination unit 75 determines the remaining lifetime of all the light source devices 32 (32A to 32D).
If it is determined in the determination process of step S2 that there is no light source device 32 whose remaining lifetime is equal to or shorter than the switching time (step S2: NO), the lighting mode setting unit 78 sets the light source devices 32A to 32D. All the lighting modes are set to the short life / high luminance mode (step S3). Then, the control apparatus 7 returns a process to step S1.

On the other hand, when it is determined in the determination process in step S2 that there is a light source device 32 whose remaining lifetime is equal to or shorter than the switching time (step S2: YES), the posture determination unit 77 uses the posture detection device 6. Based on the detection result, it is determined whether or not the posture of the projector 1 is the vertical posture (step S4).
If it is determined in the determination processing of step S4 that the posture is the vertical position (step S4: YES), the lighting mode setting unit 78 indicates that the current lighting mode is the short life / high luminance mode and the vertical Among the light source devices 32 located on the upper side (the light source device 32 in which the light emission direction is vertically downward), the lighting mode of at least one light source device 32 is preferentially set to the long life / low luminance mode (step) S5). In addition, the lighting mode of the other light source device 32 is maintained as it is.
After such step S5, the control device 7 shifts the processing to step S7.

  On the other hand, when it is determined in the determination process of step S4 that the posture is not in the vertical position (step S4: NO), the lighting mode setting unit 78 has the light source device 32 whose current lighting mode is the short life / high luminance mode. Among these, at least one lighting mode is switched to the long life / low luminance mode (step S6). Thereafter, the control device 7 performs the process from step S7.

In step S7, the time update unit 76 updates the switching time (step S7). Thereby, in addition to the switching time being shorter than the switching time before the update, the light source device 32 whose lighting mode is already set to the long life / low luminance mode is removed from the determination target of the time determination unit 75. For this reason, the light source device 32 whose lighting mode is switched to the long life / low luminance mode is maintained in the long life / low luminance mode even if the above steps S1 to S7 are repeatedly executed.
Thereafter, the control device 7 returns the process to step S1, and the above process is repeatedly executed until the operation mode of the projector 1 is changed from the life extension mode.
In such a lighting control process, the operation control unit 79 controls each lighting circuit 41 so that the lamp power corresponding to the set lighting mode is supplied to the light source device 32 (the arc tube 322). The light source device 32 can be turned on according to each lighting mode.

[Lighting mode switching timing]
FIG. 7 is a diagram illustrating an example of the switching timing of the lighting mode according to the remaining lifetime of each light source device 32A to 32D and an example of the transition of the remaining lifetime.
By executing the lighting control process, the remaining lifetimes of the light source devices 32 are different from each other. Therefore, the light source devices 32 are prevented from being extinguished at the same time.
Specifically, as shown in FIG. 7, at the timing Tm1 when the remaining life time of each light source device 32 is equal to or less than the time T1 that is the switching time, the lighting mode of one light source device 32 is short life / high luminance. The mode is changed to the long life / low brightness mode. At this time, when the posture of the projector 1 is the vertically placed posture, one of the light source devices 32 (for example, the light source device 32A) whose light emission direction is vertically downward has a lighting mode with a short life / high life. The light source device 32 to be changed from the luminance mode is selected, and the lighting mode of the light source device 32 is switched to the long life / low luminance mode. The lamp power corresponding to the long life / low luminance mode is supplied from the corresponding lighting circuit 41 to the light source device 32, and the switching time is updated from time T1 to time T2.

  As a result, lamp power lower than the lamp power supplied in the short life / high brightness mode is supplied to the light source device 32, so that the reduction rate of the remaining life time of the light source device 32 is set to the other light source device 32. Compared with (light source device 32 whose lighting mode is short life / high luminance mode), the life of light source device 32 (light source device 32A in the example of FIG. 7) can be extended.

Similarly, the lighting mode of one light source device 32 is changed from the short life / high luminance mode to the long life at the timing Tm2 when the remaining life time of the remaining light source device 32 becomes equal to or less than the updated switching time T2. / Changed to low brightness mode. Also in this case, when the posture of the projector 1 is the vertical posture, the lighting mode of the light source device 32 (for example, the light source device 32C) whose light emission direction is vertically downward is preferentially long life / low luminance. Switch to mode.
In addition, at the timing Tm3 when the remaining lifetime of the remaining light source device 32 becomes time T3 that is a further updated switching time, one of the remaining light source devices 32 (for example, the light source device 32B). ) Lighting mode is switched to the long life / low luminance mode.
Further, at the timing Tm4 when the remaining lifetime of the remaining light source device 32 (for example, the light source device 32D) becomes the updated switching time T4, the lighting mode of the light source device 32 is long life / low. Switch to brightness mode.
Thereby, the lifetime of the arc tube 322 which each light source device 32 has can be varied. Therefore, as described above, it is possible to suppress that all the light source devices 32 reach the end of their lives and are turned off at the same time.

The projector 1 according to the present embodiment described above has the following effects.
The control device 7 individually controls the lighting states of the arc tubes 322 included in the plurality of light source devices 32 by the lighting mode setting unit 78 and the operation control unit 79. According to this, the lighting state of each arc tube 322 can be controlled so that the lifetime of the arc tube 322 included in at least one light source device 32 is longer than the lifetime of the arc tube 322 included in the other light source device 32. . Accordingly, it is possible to suppress the fact that each arc tube 322 reaches the end of its life and cannot be turned on at the same time, and even when one arc tube 322 reaches the end of its life, image projection can be continued by the light emitted from the other arc tube 322. .
In addition, since the lighting state of each arc tube 322 can be individually controlled in this way, the amount of light emitted from each light source device 32 can be adjusted, and as a result, compared to the case where each light source device 32 is lit in the same lighting state. The amount of light emitted from the illumination device 31 to the light modulation device can be finely adjusted. Therefore, the brightness of the projected image can be finely adjusted.

  The operation control unit 79 controls the lighting state of the arc tube 322 of each light source device 32 according to the lighting mode set by the lighting mode setting unit 78. When the operation mode of the projector 1 is the life extension mode, the lighting mode setting unit 78 sets the lighting mode of the at least one light source device 32 to that of the arc tube 322 as compared with the case of lighting in the short life / high luminance mode. The mode is switched to the long life / low luminance mode in which the life is long, and the lighting mode of the other light source device 32 is set to the short life / high luminance mode. According to this, the lifetime of the arc tube 322 included in the at least one light source device 32 can be extended from the lifetime of the arc tube 322 included in the other light source device 32. Accordingly, it is possible to prevent the light emitting tubes 322 from reaching the end of their lives at the same time, and to continue image projection.

Here, the life of the arc tube 322 tends to be longer in the case of lighting with low luminance than in the case of lighting with high luminance.
On the other hand, when the lighting mode is the long life / low luminance mode, the arc tube 322 is lit with low luminance, and when the lighting mode is the short life / high luminance mode, the arc tube 322 is high luminance. Lights on. Thus, the life of the arc tube 322 that is lit in the long life / low luminance mode can be reliably extended from the life of the arc tube 322 that is lit in the short life / high luminance mode. Accordingly, it is possible to reliably prevent the arc tubes 322 from reaching the end of their lives at the same time, and to reliably continue image projection.
In addition, since the lighting circuit 41 for lighting the arc tube 322 according to the lighting mode is provided according to each light source device 32, each lighting state of the arc tube 322 included in each light source device 32 is surely determined. Can be controlled individually.

The voltage applied to the arc tube 322 changes according to the deterioration state of the arc tube 322. For this reason, it is difficult to change the voltage applied to the arc tube 322 to change the lighting state of the arc tube 322 to a lighting state corresponding to the set lighting mode.
On the other hand, each lighting circuit 41 can be switched between a case where the luminous tube 322 is turned on with high luminance and a case where the luminous tube 322 is turned on with low luminance by changing the power (current) supplied to the luminous tube 322. The lighting state of the arc tube 322 can be controlled according to the mode. Therefore, it can suppress more reliably that each arc tube 322 reaches the lifetime simultaneously, and image projection can be continued more reliably.

  When the remaining life time of the arc tube 322 becomes a predetermined time or less, the lighting mode of at least one light source device 32 among the plurality of light source devices 32 is set to the long life / low luminance mode. According to this, until the remaining lifetime becomes a predetermined time or less, the lighting mode of each light source device 32 can be set to the short life / high luminance mode, and the luminous tube 322 of each light source device 32 is illuminated with high luminance. Can be made. Accordingly, since a high amount of light can be emitted from the illumination device 31 having each light source device 32, a high-luminance image can be projected.

  Based on the detection result by the posture detection device 6 that detects the posture of the exterior housing 2, the posture determination unit 77 makes a vertical posture in which the light emission direction from at least one light source device 32 is vertically downward. When it is determined that the projector 1 (exterior housing 2) is disposed in the lighting mode setting unit 78, when the lighting mode of at least one light source device 32 is changed to the long life / low luminance mode, the lighting mode setting unit 78 The lighting mode of the light source device 32 whose emission direction is vertically downward is preferentially changed to the long life / low luminance mode. According to this, the deterioration of the light source device 32 can be suppressed by changing the lighting mode of the light source device 32 having the light emitting tubes 322 in the arrangement in which the deterioration easily occurs to the long life / low luminance mode. Therefore, it can suppress that the lifetime of the light source device 32 is shortened from assumption.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the above embodiment, when the lighting mode of the light source device 32 is switched to the long life / low luminance mode, the installation posture of the projector 1 (exterior housing 2) is the light source device 32 in which the light emission direction is downward in the vertical direction. If it is an existing posture (vertical posture), the lighting mode of the light source device 32 is preferentially switched to the long life / low luminance mode. In this case, even when the lighting mode is not switched, when the attitude of the projector 1 is changed and the light source device 32 in which the light emission direction is downward in the vertical direction is changed, the light source device 32 has a long life / low life. Instead of the light source device 32 in the luminance mode, the lighting mode of the light source device 32 that has already been switched to the long life / low luminance mode may be switched to the short life / high luminance mode.
The arrangement of the light source devices 32 can be changed as appropriate, and the two light source devices 32 do not have to face each other. For example, the light source devices 32 may be arranged so that the light emission directions are parallel to each other, and the light source devices 32 may be arranged so that the light traveling directions are orthogonal to each other.
Further, the posture in which the light emission direction from the at least one light source device 32 is downward in the vertical direction is not limited to the vertical placement posture, and may be determined by the arrangement of the light source devices 32.

  In the above-described embodiment, the operation control unit 79 changes the lamp power supplied to the arc tube 322 by the lighting circuit 41 to change the lighting state of the light source device 32 having the arc tube 322 to the set lighting mode. The lighting state was set accordingly. However, the present invention is not limited to this. For example, the operation control unit 79 sets the frequency of the lamp power (the frequency of the lamp current) supplied by the lighting circuit 41 to the arc tube 322 of the light source device 32 set in the long life mode to the light source set in the short life mode. The lighting state of the corresponding light source device 32 may be controlled by lowering the lamp power frequency (lamp current frequency) supplied to the arc tube of the device 32. That is, as long as the lifetime of each light source device 32 can be extended individually, the lighting state of the light source device 32 may be controlled by any method.

  In the above embodiment, in the lighting control process, the lighting mode of the light source device 32 is switched to the long life / low luminance mode one by one. However, the present invention is not limited to this. For example, the plurality of light source devices 32 may be divided into a plurality of groups including at least one light source device 32, and the lighting mode may be changed and set for each group. For example, when the posture of the projector 1 (exterior housing 2) is the above-described vertical posture, when there are a plurality of light source devices 32 in which the light emission direction is vertically downward, these light source devices 32 (for example, The lighting mode of the light source devices 32A and 32C) may be changed to the long life / low luminance mode at a time.

  In the above embodiment, the lighting mode of at least one light source device 32 is switched to the long life / low luminance mode according to the remaining life time. However, the present invention is not limited to this. For example, the light source device 32 whose lighting mode can be switched to the long life / low luminance mode among the plurality of light source devices 32 may be sequentially switched every time a predetermined lighting time elapses. For example, when the operation mode of the projector 1 is switched to the life extension mode, or when the remaining life time reaches a predetermined ratio of the assumed life time, the lighting mode setting unit 78 has at least one The lighting mode of the light source device 32 is switched from the short life / high luminance mode to the long life / low luminance mode, and at least one light source whose lighting mode is switched to the long life / low luminance mode each time a predetermined time elapses from that point. The device 32 may be rotated.

  In this case, the lighting mode setting unit 78 switches the light source device 32 whose lighting mode is the long life / low luminance mode among the light source devices 32A to 32D every predetermined time, and sets the lighting mode of the other light source devices 32. Short life / high brightness mode. For example, the lighting mode setting unit 78 sequentially switches the light source device 32 in which the lighting mode is the long life / low luminance mode in the order of the light source devices 32A, 32B, 32C, and 32D, every predetermined time. The lighting mode of the light source device 32 that is not changed to the luminance mode is set to the short life / high luminance mode. When the light source device 32 is switched, the lighting mode of the light source device 32A may be switched again to the long life / low luminance mode depending on the length of the predetermined time.

In addition, the light source device 32 in which the lighting mode becomes the long life / low luminance mode may be changed at the timing of power ON / OFF. According to such a configuration, it is possible to cause a variation in the period in which the lighting mode is the long life / low luminance mode for each light source device 32 according to the usage time of the projector 1 once. Variations in the remaining lifetime of each light source device 32 can be caused. Therefore, it can suppress that each light source device 32 reaches the lifetime simultaneously and is extinguished.
Further, even when such switching is performed, the lighting mode of the light source device 32 in which the light emission direction is downward in the vertical direction may be preferentially set to the long life / low luminance mode.

In the said embodiment, the lighting mode of light source device 32A-32D was changed according to the remaining lifetime based on assumption lifetime and cumulative lighting time. However, the present invention is not limited to this.
For example, the time determination unit 75 individually determines whether or not the cumulative lighting time of each light source device 32 has reached a predetermined time, or whether or not the remaining lifetime has become another predetermined time or less for each light source device 32. When the accumulated lighting time reaches the predetermined time, or when the remaining life time becomes equal to or shorter than the other predetermined time, the lighting mode of the corresponding light source device 32 is changed from the short life / high luminance mode to the long time. You may switch to the life / low brightness mode.

Further, for example, the lighting mode of each light source device 32 may be changed based on the detection result of the luminance sensor that detects the luminance of the emitted light from the illumination device 31. For example, when the brightness of the emitted light has decreased, it is assumed that the arc tube 322 of the light source device 32 that is currently lit in the short life / high brightness mode has deteriorated. The lighting mode of the light source device 32 lit in the short life / high luminance mode is changed to the long life / low luminance mode, and the lighting mode of the light source device 32 lit in the long life / low luminance mode is shortened. / You may switch to high brightness mode. The luminance sensor employed in this case may be provided in an optical component housing that houses therein the optical components constituting the image forming apparatus 3 as long as the luminance of the light emitted from the illumination device 31 can be detected. You may arrange | position in the position which can detect the brightness | luminance of the image projected on the to-be-projected surface. In the latter case, an imaging device that detects the shape of the projected image and the position indicated by the user using an electronic pen or a pointer may be used.
Further, the deterioration state of the arc tube 322 is determined according to a change in the voltage (interelectrode voltage) supplied to the arc tube 322, and the lighting mode of the light source device 32 having the arc tube 322 determined to have a large degree of deterioration. May be set to the long life / low luminance mode, and the lighting mode of the light source device 32 having the arc tube 322 determined to have a small degree of deterioration may be set to the short life / high luminance mode.

In the above embodiment, when the operation mode of the projector 1 is switched to the life extension mode, the lighting mode setting unit 78 automatically sets the lighting mode of each light source device 32, and the operation control unit 79 is set. The lighting state of the light source device 32 is controlled by the lighting circuit 41 based on the lighting mode. However, the present invention is not limited to this. For example, the user may set the lighting mode of each light source device 32, and the operation control unit 79 may control the lighting state of the corresponding light source device 32 based on the set lighting mode.
In this case, for example, the remaining life time of each light source device 32 is displayed on the OSD screen or the like according to the input operation of the user, and the user sets the lighting mode of each light source device 32 according to another input operation. A switchable menu screen may be displayed. And the lighting mode setting part 78 may set the lighting mode of each light source device 32 based on the setting operation of the user with respect to the said menu screen.

In the above embodiment, the long life / low luminance mode and the short life / high luminance mode are exemplified as the lighting modes of the light source device 32 (the arc tube 322). However, the present invention is not limited to this. For example, a medium life / medium luminance mode having an intermediate life and luminance may be included. That is, the number of lighting modes is not limited to two, and there may be more lighting modes.
In the embodiment, the three operation modes are exemplified as the operation mode of the projector 1. However, the present invention is not limited to this. For example, the operation mode of the projector 1 may include other operation modes in addition to the above three operation modes or instead of these operation modes. Furthermore, a projector in which the operation mode is only the life extension mode may be configured. That is, it is only necessary to control the lighting state for each of the plurality of arc tubes.

  In the embodiment described above, the posture determination unit 77 determines the posture of the projector 1 (exterior housing 2) based on the detection result by the posture detection device 6 having a sensor. However, the present invention is not limited to this. That is, the configuration of the attitude detection device 6 is not limited to the above as long as the attitude of the projector 1 can be detected. For example, the attitude detection device 6 may be configured to include a button or a sensor that is provided in the exterior housing 2 and is pressed or pressed according to the attitude of the projector 1. Further, when the projector 1 is configured to be usable in a posture in which the light source device 32 in which the light emission direction is downward is present, and the light source device 32 having the storage body 326 corresponding to the posture is mounted, the posture detection device 6. It is good also as a structure which can detect mounting | wearing of the said light source device 32. In this case, when the light source device 32 having the storage body 326 corresponding to the posture is included in the mounted light source device 32, the lighting mode setting unit 78 causes the light emission direction to be downward in the vertical direction. The lighting mode of the light source device 32 may be preferentially switched to the long life / low luminance mode.

  In the above embodiment, the illumination device 31 includes the four light source devices 32 each having the arc tube 322. However, the present invention is not limited to this. That is, the number of the light source devices 32 can be appropriately changed as long as it is two or more. In addition, if the lamp power can be individually supplied to the arc tube 322 of each light source device 32, the number of lighting circuits 41 can be changed as appropriate.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior casing, 31 ... Illuminating device, 32 (32A-32D) ... Light source device, 322 ... Light emission tube, 3221 ... Light emission part, 3222 ... Sealing part, 324 ... Reflection mirror, 34 ... Light modulation 35, projection optical device, 41 (41A to 41D), lighting circuit, 6 ... posture detection device, 7 ... control device, 74 ... remaining life calculation unit, 77 ... posture determination unit, 78 ... lighting mode setting unit, 79 ... Operation control unit.

Claims (6)

A lighting device;
A light modulation device that modulates light emitted from the illumination device;
A projection optical device for projecting light modulated by the light modulation device;
A control device for controlling lighting of the lighting device,
The illumination device includes a plurality of light source devices each having an arc tube that emits light,
The control device individually controls lighting states of the arc tubes included in the plurality of light source devices. The projector according to claim 1.
The control device includes:
The lighting mode of at least one light source device among the plurality of light source devices is set to a second life mode in which the life of the arc tube is longer than that in lighting in the first life mode, and lighting of other light source devices is performed. A lighting mode setting unit for setting the mode to the first life mode;
An operation control unit that controls each lighting state of the arc tube included in the plurality of light source devices according to the lighting mode set by the lighting mode setting unit. The projector according to claim 2,
Provided according to each of the plurality of light source devices, and having a plurality of lighting circuits for lighting the corresponding light source device among the plurality of light source devices according to the set lighting mode,
When the lighting mode of the corresponding light source device is the second life mode, the plurality of lighting circuits light the light emitting tube of the light source device with low luminance, and the lighting mode of the corresponding light source device is In the first life mode, the arc tube included in the light source device is turned on with high brightness. The projector according to claim 3.
The plurality of lighting circuits change power supplied to the corresponding arc tube in accordance with the lighting mode. The projector according to claim 3 or 4,
The control device has a remaining life calculation unit that calculates a remaining life time of the arc tube included in the plurality of light source devices,
The projector is characterized in that the lighting mode setting unit sets the lighting mode of the at least one light source device to the second lifetime mode when the remaining lifetime becomes a predetermined time or less. The projector according to any one of claims 2 to 5,
An exterior casing constituting the exterior; and
An attitude detection device for detecting the attitude of the exterior housing,
Each of the plurality of light source devices is
The arc tube;
A reflecting mirror having a concave curved reflecting surface that reflects light incident from the arc tube, and
The arc tube is
A light emitting unit for emitting light;
Extending from one end of the light emitting part, and having a sealing part to which the reflecting mirror is fixed,
Based on the detection result of the posture detection device, the control device is arranged so that the light emission direction from at least one light source device among the plurality of light source devices is vertically downward. Having an attitude determination unit for determining whether or not the exterior housing is disposed;
When the lighting mode setting unit sets the lighting mode of the at least one light source device to the second life mode, it is determined by the posture determination unit that the exterior casing is arranged to be in the posture. Then, among the plurality of light source devices, the projector is characterized in that the lighting mode of the light source device whose light emission direction is vertically downward is preferentially set to the second life mode.

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