JP4281429B2 - LIGHTING DEVICE AND PROJECTOR HAVING THE SAME - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting device and a projector including the same.
[0002]
[Prior art]
In the projector illumination device, a cooling device for cooling the light source lamp is required. However, when the cooling of the cooling device is insufficient, particularly when the temperature rises too much in the upper part of the arc tube and rises to, for example, 1100 ° C. or more, the glass becomes cloudy or the arc tube is deformed. On the other hand, when the cooling is excessive, especially when the temperature is too low at the lower part of the arc tube and falls to, for example, 600 ° C. or less, the gas vapor pressure in the arc tube becomes too low and the life of the arc tube is shortened. Or the image quality deteriorates due to a decrease in luminance or a deterioration in the spectral characteristics of light.
[0003]
For this reason, an excessive temperature rise in the upper part of the arc tube is prevented in order to prevent the occurrence of glass turbidity and lamp deformation, and the light emission is suppressed in order to prevent the life of the arc tube from being shortened and the image quality from being deteriorated. It is necessary to suppress an excessive temperature drop in the lower part of the pipe. That is, it is important that the upper portion of the arc tube is sufficiently cooled, while it is important that the lower portion of the arc tube is not excessively cooled.
[0004]
FIG. 8 is a cross-sectional view showing the structure of a conventional lighting device. As shown in FIG. 8, this lighting device incorporates a cooling device for cooling the arc tube and the like by a so-called descending air flow from the top to the bottom in the accommodation space of the arc tube 805 (the internal space of the reflector). . For this reason, according to this lighting device, it is possible to prevent an excessive temperature rise in the upper side of the arc tube, thus preventing white turbidity of the glass and deformation of the arc tube, and an excessive temperature decrease in the lower side of the arc tube. Therefore, it is possible to prevent the life of the arc tube from being shortened and the image quality from being deteriorated.
[0005]
In this illuminating device, a descending airflow flows into the reflector through the air passage of the light source lamp housing (lamp housing), and the arc tube in the reflector is cooled by this airflow (for example, patent) Reference 1).
[0006]
[Patent Document 1]
JP-A-8-186784 (FIG. 7)
[0007]
[Problems to be solved by the invention]
By the way, the projector is projected not only when the projector housing is used in a normal installation state, but also when the projector housing is turned upside down from the normal installation state (installation state in the ceiling). There is something.
In such a projector, when the projector housing is used in a normal installation state, a downward air flow is formed in the reflector from the top to the bottom. However, the projector housing is placed in a ceiling-mounted state. As a result, an upward air flow from the lower side to the upper side is formed in the reflector.
[0008]
For this reason, if the projector is used with the projector suspended from the ceiling, it will not be easy to sufficiently cool the upper part of the arc tube, thus preventing the glass from becoming cloudy or the arc tube from being deformed. There was a problem that would not be easy. On the other hand, if the upper part of the arc tube is sufficiently cooled by increasing the air flow velocity, the lower part of the arc tube will be overcooled, resulting in a shortened lamp life and reduced image quality. There was a problem of doing.
[0009]
Accordingly, the present invention has been made to solve such a problem, and when the projector housing is used in a normal installation state and when the projector housing is used in a ceiling-mounted installation state. In any of the above, the arc tube can be cooled satisfactorily, and therefore there is provided an illuminating device capable of suppressing the cloudiness of the glass, the deformation of the arc tube, the shortening of the life of the arc tube and the deterioration of the image quality, and the same. An object is to provide a projector.
[0010]
[Means for Solving the Problems]
(1) An illuminating device according to the present invention includes an arc tube that emits illumination light, and is an illuminating device for use in a projector capable of projecting the projector case upside down. A cooling device that cools the arc tube with a descending airflow in both the case of projecting in a normal installation state and the case of projecting the projector housing in an installation state that is upside down from the normal installation state. It is further provided with a feature.
[0011]
For this reason, according to the illuminating device of this invention, even if it uses not only a normal installation state but the installation state of a ceiling suspension, a downward airflow is formed. For this reason, it is possible to sufficiently cool the upper portion of the arc tube and to cool the lower portion of the arc tube without being excessively cooled. For this reason, it becomes an illuminating device which can suppress the cloudiness of glass, the deformation | transformation of an arc tube, the lifetime reduction of an arc tube, and the fall of an image quality.
[0012]
(2) In the lighting device according to (1), a light source lamp housing having a first air passage and a second air passage for cooling, and a light source lamp housing disposed in the light source lamp housing, And a reflector having a plurality of communication ports that can communicate with each other, and the cooling device includes a flow path switching device for forming a downward air flow in the reflector, and the flow path switching device includes both the air passages. It is preferable to comprise an opening / closing device that selectively opens and closes.
With this configuration, it is possible to selectively open and close the first air passage and the second air passage by switching the opening and closing device, so that it can be used not only in a normal installation state but also in a ceiling suspension installation state. In this case, it is possible to easily form a downdraft in the reflector. For this reason, it becomes easy to perform good cooling of the arc tube, and the lighting device can easily suppress the cloudiness of the glass, the deformation of the arc tube, the shortening of the lifetime of the arc tube, and the deterioration of the image quality.
[0013]
(3) In the lighting device according to (1) above, the lighting device housing case having the first and second air flow passages for cooling, and the two ventilation holes disposed in the lighting device housing case. And a reflector having a plurality of flow ports that can communicate with a path, and the cooling device includes a flow path switching device for forming a downward air flow in the reflector, and the flow path switching device includes the both flow paths. It is also preferable to comprise an opening / closing device that selectively opens and closes the air passage.
With this configuration, as in the case of (2) above, it is possible to selectively open and close the first air passage and the second air passage by switching the opening and closing device, so that only the normal installation state is available. Even when the projector is used in a suspended state, a descending airflow can be easily formed in the reflector. For this reason, it becomes easy to perform good cooling of the arc tube, and the lighting device can easily suppress the cloudiness of the glass, the deformation of the arc tube, the shortening of the lifetime of the arc tube, and the deterioration of the image quality.
The lighting device housing case is literally a housing for housing the lighting device, but it may be a housing for housing not only the lighting device but also the entire illumination optical system, or the entire projector optical system. It may be a housing for storing the.
[0014]
(4) In the illuminating device according to (2) or (3), it is preferable that the circulation port is disposed at the upper and lower portions of the reflector.
With this configuration, in a normal installation state and a ceiling-mounted installation state, an air flow flows into the reflector from the upper circulation port, the arc tube in the reflector is cooled, and the outside of the reflector is removed from the lower circulation port. Therefore, a downward airflow is easily formed.
[0015]
(5) In the illumination device according to any one of (2) to (3), it is preferable that the opening / closing device includes a shutter that is opened and closed by an upside down operation of a casing of the projector.
With this configuration, the shutter is automatically opened and closed by the gravitational action caused by the upside down operation of the projector housing, so that the projector is easy to handle.
[0016]
(6) In the illumination device according to any one of (2) to (5), the opening / closing device may have a shutter that is automatically or manually opened / closed.
In these cases, the shutter is electrically opened and closed electrically, and the shutter is manually opened and closed mechanically.
[0017]
(7) In the illuminating device according to any one of (2) to (6) above, the reflector may be provided with a circulation port that opens on the opposite side of the light beam emission direction.
In this case, the airflow that has flowed into the reflector from the first ventilation path or the second ventilation path flows out of the reflector from the flow port on the opposite side to the light beam emission direction after cooling the arc tube in the reflector. .
[0018]
(8) The projector according to the present invention is separated by an illumination device that emits illumination light, a color separation optical system that separates the illumination light emitted from the illumination device into a plurality of color lights, and the color separation optical system. A plurality of electro-optic modulation devices that modulate each color light to form an image, a color synthesis optical system that synthesizes the modulated light emitted from the plurality of electro-optic modulation devices, and the color synthesis optical system. In a projector including a projection optical system that projects and displays an image on a projection surface, the illumination device is the illumination device according to any one of (1) to (7).
[0019]
For this reason, according to the projector of the present invention, a downdraft is formed even when the projector is used not only in a normal installation state but also in a ceiling-mounted installation state. For this reason, the upper portion of the arc tube is sufficiently cooled, and the lower portion of the arc tube can be sufficiently cooled without being excessively cooled. For this reason, it becomes a projector which can suppress the cloudiness of glass, the deformation | transformation of an arc tube, the lifetime reduction of an arc tube, and the fall of an image quality.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an illumination device to which the present invention is applied and a projector equipped with the illumination device will be described based on embodiments shown in the drawings.
[0021]
[Embodiment 1]
FIG. 1 is a plan view showing an optical system of a projector according to Embodiment 1 of the present invention. In FIG. 1, a projector denoted by reference numeral 1 includes an illumination optical system 100, a color separation optical system 200, a relay optical system 300, three liquid crystal display devices 400R, 400G, and 400B, a cross dichroic prism 500, and projection optics. System 600. The components of each optical system are arranged in a substantially horizontal direction around the cross dichroic prism 500.
[0022]
The illumination optical system 100 includes an illumination device 110, a first lens array 120, a second lens array 130, a polarization conversion element 140, and a superimposing lens 150. The light beam emitted from the illumination device 110 is divided into a plurality of minute partial light beams by the first lens array 120, and each partial light beam is three liquid crystal display devices to be illuminated by the second lens array 130 and the superimposing lens 150. Superimposed on the light incident surfaces of 400R, 400G, and 400B.
[0023]
The first lens array 120 and the second lens array 130 are formed by arranging small lenses in a matrix.
The polarization conversion element 140 has a function of aligning non-polarized light with polarized light having a polarization direction that can be used in the three liquid crystal display devices 400R, 400G, and 400B.
[0024]
The color separation optical system 200 has a function of separating the illumination light emitted from the illumination optical system 100 into three colors of illumination light having different wavelength ranges. The first dichroic mirror 210 transmits substantially red light (hereinafter referred to as “R light”), substantially green light (hereinafter referred to as “G light”), and substantially blue light (hereinafter referred to as “B light”). Is reflected). The R light transmitted through the first dichroic mirror 210 is reflected by the reflection mirror 230, passes through the field lens 240R, and illuminates the R liquid crystal display device 400R.
[0025]
The field lens 240R condenses the plurality of partial light beams from the illumination optical system 100 so as to illuminate the liquid crystal display device 400R. Usually, each partial light beam is set to be a substantially parallel light beam. The field lenses 240G and 350 disposed in front of the other liquid crystal display devices 400G and 400B are configured similarly to the field lens 240R.
[0026]
Of the G light and B light reflected by the first dichroic mirror 210, the G light is further reflected by the second dichroic mirror 220 and passes through the field lens 240G to illuminate the G liquid crystal display device 400G. On the other hand, the B light passes through the second dichroic mirror 220, passes through the relay optical system 300, and illuminates the B liquid crystal display device 400B.
[0027]
The relay optical system 300 includes an incident side lens 310, an incident side reflection mirror 320, a relay lens 330, an emission side reflection mirror 340, and a field lens 350. The B light emitted from the color separation optical system 200 is converged in the vicinity of the relay lens 330 by the incident side lens 310 and diverges toward the field lens 350 (exit side reflection mirror 340). The size of the light beam incident on the field lens 350 is set to be approximately equal to the size of the light beam incident on the incident side lens 310.
[0028]
The liquid crystal display devices 400R, 400G, and 400B for each color convert the color light incident on the respective light incident surfaces into light corresponding to the corresponding color signal (image signal), and transmit the converted light to transmitted light. Inject as. Incident side polarizing plates 918R, 918G, and 918B are arranged on the incident side of these liquid crystal display devices 400R, 400G, and 400B, and emission side polarizing plates 920R, 920G, and 920B are arranged on the emission side thereof. A transmissive liquid crystal display device is used as the liquid crystal display devices 400R, 400G, and 400B.
[0029]
The cross dichroic prism 500 has a function as a color synthesizing optical system that synthesizes the converted lights of the respective colors emitted from the liquid crystal display devices 400R, 400G, and 400B for the respective colors. The combined light generated in the cross dichroic prism 500 is emitted toward the projection optical system 600.
[0030]
The projection optical system 600 includes a plurality of projection lenses, and is configured to project and display the combined light from the cross dichroic prism 500 on a screen (projected image) as a display image.
[0031]
FIG. 2 is an explanatory diagram schematically showing the illumination device according to the first embodiment of the present invention. 2A is a front view, and FIG. 2B is a cross-sectional view. FIG. 3 is an explanatory diagram showing the lighting device in a normal installation state. FIG. 3A is a front view, and FIG. 3B is a cross-sectional view. FIG. 4 is an explanatory view showing the lighting device in a ceiling-mounted state. 4A is a front view, and FIG. 4B is a cross-sectional view.
[0032]
As illustrated in FIG. 2, the illumination device 110 according to the present embodiment is generally configured by a light source lamp housing 112, a reflector 114, a light transmitting member 116, an arc tube 118, and a cooling device 119.
[0033]
The light source lamp casing 112 opens in the front-rear direction and is disposed in an optical component storage casing (projector casing). The light source lamp housing 112 is provided with an upstream cooling air passage 112A that opens to the side, and a downstream cooling air passage 112B that can communicate with the cooling air passage 112A. The upstream cooling air passage 112A is formed by a single air passage, and the downstream cooling air passage 112B has a plurality of air passages (first cooling air passage 112B). ₁ , Second cooling air passage 112B ₂ ). The light source lamp housing 112 includes a first cooling air passage 112B. ₁ And the second cooling air passage 112B ₂ Distribution ports 112a that can communicate with each other via relay space portions a and b, respectively. ₁ 112a ₂ There is provided a light source lamp housing space 112a.
[0034]
The reflector 114 has an opening 114 </ b> A that opens forward (light emission direction) and a reflector space 114 </ b> B that communicates with the opening 114 </ b> A, and is attached to the light source lamp housing 112. The reflector 114 is provided with a reflecting portion 114C having a parabolic cross section. And it is comprised so that the illumination light from the arc_tube | light_emitting_tube 118 may be reflected and inject | emitted ahead substantially parallel along the virtual center axis line L of 114 C of reflection parts. Further, the reflector 114 is provided with a non-reflective portion 114D connected to the reflective portion 114C. On both sides of the reflector 114, there are provided two upper and lower flow ports 114E and 114F that are located in the vicinity of the opening 114A and pass through the non-reflective portion 114D and communicate with the relay space portions a and b, respectively.
The reflector is not limited to the reflector provided with the reflecting portion 114C having a parabolic cross section, and may be a reflector provided with the reflecting portion 114C having a partially elliptical cross section.
[0035]
In the vicinity of the circulation port 114E, there is a first cooling air passage 112B. ₁ Rectifying plate 114E for introducing an air flow from the reflector 114 into the reflector 114 and an air flow from the reflector 114 to the light source lamp housing space 112a. ₁ Is arranged. In the vicinity of the circulation port 114F, the second cooling air passage 112B is provided. ₂ Rectifying plate 114F for guiding the air flow from the reflector 114 into the reflector 114 and the air flow from the reflector 114 to the light source lamp housing space 112a. ₁ Is arranged.
[0036]
The translucent member 116 is disposed in front of the reflector 114 so as to cover the opening 114A, is attached to the light source lamp housing 112, and is entirely formed of a hard high heat resistant member. And it is comprised so that the illumination light from the arc_tube | light_emitting_tube 118 may be permeate | transmitted.
[0037]
The arc tube 118 is formed of a high-pressure mercury lamp having a glass tube 118A made of quartz glass, and is disposed behind the translucent member 116 and disposed in the reflector 114. And it is comprised so that illumination light may be discharge | released. As the arc tube, another arc tube such as a xenon lamp or a metal halide lamp may be used.
[0038]
The cooling device 119 includes an intake fan (not shown) for sucking outside air into the projector housing, and the first cooling air passage 112B. ₁ And the second cooling air passage 112B ₂ 119A for opening and closing the channel for selectively opening and closing ₁ And the circulation port 112a of the light source lamp housing space 112a ₁ 112a ₂ 119A for opening / closing selectively ₂ And an exhaust fan (not shown) for discharging the inside air out of the housing of the projector. In both cases of projecting with the projector housing in the normal installation state and projecting with the projector housing in the installation state inverted upside down from the normal installation state, the downdraft is generated in the reflector 114. It is comprised so that can be formed.
[0039]
Switchgear 119A ₁ Is a first shutter 119a that opens and closes (rotates) by the action of gravity by the upside down operation of the projector housing ₁ To third shutter 119a _Three And a first hinge 119a for pivotally supporting them. _Four ~ Third hinge 119a ₆ It is roughly composed of First shutter 119a ₁ To third shutter 119a _Three The weight is set such that it does not open and close by the air flow formed in the projector casing.
[0040]
First shutter 119a ₁ And the first hinge 119a _Four Is an end portion (downstream portion) of the upstream cooling air passage 112A, and is the first cooling air passage 112B. ₁ And the second cooling air passage 112B ₂ It arrange | positions in the site | part located in each starting end part (upstream part). Second shutter 119a ₂ And the second hinge 119a _Five Is the first cooling air passage 112B. ₁ Is disposed at a portion located near the relay space a. Third shutter 119a _Three And a third hinge 119a ₆ The second cooling air passage 112B ₂ Is disposed at a portion located near the relay space b.
[0041]
As a result, when the projector housing is projected in a normal installation state (inverted from the ceiling installation state), as shown by the solid line in FIG. 2A, the first shutter 119a. ₁ To third shutter 119a _Three Rotates in one direction (positive direction) and the first cooling air passage 112B. ₁ Is opened and the second cooling air passage 112B ₂ Is blocked. On the other hand, in the case of projecting the projector housing from the normal installation state upside down, as shown by the two-dot chain line in FIG. 2A, the first shutter 119a. ₁ To third shutter 119a _Three Rotates in the opposite direction and the first cooling air passage 112B ₁ Is closed and the second cooling air passage 112B ₂ Is released.
[0042]
Switchgear 119A ₂ Is a fourth shutter 119a that opens and closes (rotates) due to the gravity action of the upside down operation of the projector housing ₇ And the fifth shutter 119a ₈ And the fourth shutter 119a. ₇ , Fifth shutter 119a ₈ 4th hinge 119a which pivotally supports each ₉ And fifth hinge 119a _Ten It is roughly composed of Fourth shutter 119a ₇ And the fifth shutter 119a ₈ The weight of the first shutter 119a ₁ To third shutter 119a _Three Similarly, the weight is set so as not to open and close by the air flow formed in the projector casing.
[0043]
Fourth shutter 119a ₇ And a fourth hinge 119a ₉ Is disposed between the light source lamp housing space 112a and the relay space a. Fifth shutter 119a ₈ And fifth hinge 119a _Ten Is disposed between the light source lamp housing space 112a and the relay space b.
[0044]
As a result, when the projector casing is projected in a normal installation state, as shown by the solid line in FIG. 2B, the fourth shutter 119a. ₇ And the fifth shutter 119a ₈ Rotates in the forward direction and the circulation port 112a ₁ Is closed and the circulation port 112a ₂ Is released. On the other hand, in the case of projecting with the projector housing set upside down from the normal installation state, as shown by a two-dot chain line in FIG. 2B, the fourth shutter 119a. ₇ And the fifth shutter 119a ₈ Rotates in the opposite direction and the distribution port 112a ₁ And the distribution port 112a ₂ Is blocked.
[0045]
With the above configuration, when the projector casing is projected in a normal installation state that is upside down from the ceiling installation state, as shown by the solid line in FIG. 2A, the first shutter 119a. ₁ To third shutter 119a _Three Rotates in the positive direction and the first cooling air passage 112B. ₁ Is opened and the second cooling air passage 112B ₂ Is blocked. Further, as shown by a solid line in FIG. 2B, the fourth shutter 119a. ₇ And the fifth shutter 119a ₈ Rotates in the forward direction and the circulation port 112a ₁ Is closed and the circulation port 112a ₂ Is released.
[0046]
Therefore, as indicated by arrows in FIG. 3, the air flow sucked into the projector housing by the intake fan passes through the upstream cooling passage 112A and passes through the first cooling air passage 112B. ₁ And the first cooling air passage 112B. ₁ And it passes through the relay space part a and flows into the reflector 114 from the circulation port 114E. Then, it passes through the reflector 114 as a downdraft, and the circulation port 114F, the relay space b, and the circulation port 112a. ₂ It flows out into the light source lamp housing space 112a outside the reflector 114 via the. At this time, the arc tube 118 in the reflector 114 is cooled by the downdraft. Thereafter, the airflow that has flowed out into the light source lamp housing space 112a is discharged out of the projector housing by an exhaust fan.
[0047]
On the other hand, when the projector housing is projected from the normal installation state in the ceiling-mounted state inverted upside down, as shown by the two-dot chain line in FIG. 2A, the first shutter 119a. ₁ To third shutter 119a _Three Rotates in the opposite direction and the first cooling air passage 112B ₁ Is closed and the second cooling air passage 112B ₂ Is released. Further, as shown by a two-dot chain line in FIG. 2B, the fourth shutter 119a. ₇ And the fifth shutter 119a ₈ Rotates in the opposite direction and the distribution port 112a ₁ And the distribution port 112a ₂ Is blocked.
[0048]
Therefore, as indicated by an arrow in FIG. 4, the air flow sucked into the projector housing by the intake fan passes through the upstream cooling passage 112A and the second cooling air passage 112B. ₂ And the second cooling air passage 112B. ₂ In addition, the air passes through the relay space b and flows into the reflector 114 from the circulation port 114F. Then, it passes through the reflector 114 as a downdraft, and the circulation port 114E, the relay space a, and the circulation port 112a. ₁ It flows out into the light source lamp housing space 112a outside the reflector 114 via the. At this time, the arc tube 118 in the reflector 114 is cooled by the downdraft. Thereafter, the airflow that has flowed out into the light source lamp housing space 112a is discharged out of the projector housing by an exhaust fan.
[0049]
Therefore, in this embodiment, even if the projector is used not only in the normal installation state but also in the ceiling-mounted installation state, a downdraft is formed. For this reason, the upper portion of the arc tube 118 is sufficiently cooled, and the lower portion of the arc tube 118 can be cooled well without being excessively cooled. . For this reason, it becomes an illuminating device which can suppress the cloudiness of glass, the deformation | transformation of an arc tube, the lifetime reduction of an arc tube, and the fall of an image quality.
[0050]
[Embodiment 2]
FIG. 5 is an explanatory view schematically showing a lighting apparatus according to Embodiment 2 of the present invention. FIG. 5A is a front view, and FIG. 5B is a cross-sectional view. 5, the same members as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIG. 5, the lighting device 110 according to the present embodiment includes an intake fan and an opening / closing device 119 </ b> A for switching a flow path. ₁ , Opening and closing device 119A for opening and closing the distribution port ₂ And a cooling device 119 having a fan for exhaust, and a reflector 114 is provided with a circulation port 114G that opens on the opposite side of the light beam emission direction.
[0051]
For this reason, during use in a normal installation state, an air flow flowing into the reflector 114 from the circulation port 114E passes through the reflector 114, the circulation port 114F, and the relay space b, and the circulation port 112a. ₂ Then, the light passes through the reflector 114 and flows out from the circulation port 114G to the light source lamp housing space 112a. On the other hand, when used in the ceiling-mounted state, the air flow flowing into the reflector 114 from the circulation port 114F passes through the reflector 114, the circulation port 114E, and the relay space a, and the circulation port 112a. ₁ Then, the light passes through the reflector 114 and flows out from the circulation port 114G to the light source lamp housing space 112a.
[0052]
Therefore, also in the present embodiment, as in the first embodiment, a downward airflow is formed even when the projector is used not only in a normal installation state but also in a ceiling-mounted installation state. For this reason, the upper portion of the arc tube 118 is sufficiently cooled, and the lower portion of the arc tube 118 can be cooled well without being excessively cooled. . For this reason, it becomes an illuminating device which can suppress the cloudiness of glass, the deformation | transformation of an arc tube, the lifetime reduction of an arc tube, and the fall of an image quality.
[0053]
[Embodiment 3]
FIG. 6 is an explanatory diagram schematically showing a lighting device according to Embodiment 3 of the present invention. FIG. 6A is a front view, and FIG. 6B is a cross-sectional view. 6, the same members as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIG. 6, the lighting device shown in the present embodiment includes an intake fan and an opening / closing device 119A for switching the flow path. ₁ And a cooling device 119 having a fan for exhaust, and a reflector 114 is provided with a circulation port 114G that opens rearward.
[0054]
For this reason, during use in a normal installation state, the airflow flowing into the reflector 114 from the circulation port 114E passes through the reflector 114 and flows out from the circulation port 114G to the light source lamp housing space 112a. On the other hand, during use in the ceiling-mounted state, an air flow that flows into the reflector 114 from the circulation port 114F passes through the reflector 114 and flows out from the circulation port 114G to the light source lamp housing space 112a.
[0055]
Therefore, also in the present embodiment, as in the first embodiment, a downward airflow is formed even when the projector is used not only in a normal installation state but also in a ceiling-mounted installation state. For this reason, the upper portion of the arc tube 118 is sufficiently cooled, and the lower portion of the arc tube 118 can be cooled well without being excessively cooled. . For this reason, it becomes an illuminating device which can suppress the cloudiness of glass, the deformation | transformation of an arc tube, the lifetime reduction of an arc tube, and the fall of an image quality.
[0056]
[Embodiment 4]
FIG. 7 is an explanatory view schematically showing a lighting apparatus according to Embodiment 4 of the present invention. FIG. 7A is a front view, and FIG. 7B is a cross-sectional view.
As shown in FIG. 7, the illumination device 210 shown in the present embodiment has a cooling air passage 212B. ₁ And cooling air passage 212B ₂ A lighting device housing housing 230 having a plurality of air passages 212B. ₁ 212B ₂ The upper and lower two distribution ports 212a that can communicate with each other ₁ 212a ₂ And a cooling device 219 including a flow path switching device for forming a descending airflow in the reflector 214, and the flow path switching device includes both air passages 212B. ₁ 212B ₂ Opening / closing device 219A for selectively opening and closing ₁ 219A ₂ It is made up of.
[0057]
Therefore, also in the present embodiment, as in the first embodiment, a downward airflow is formed even when the projector is used not only in a normal installation state but also in a ceiling-mounted installation state. For this reason, the upper portion of the arc tube 218 is sufficiently cooled, and the lower portion of the arc tube 218 can be cooled satisfactorily without being excessively cooled. . For this reason, it becomes an illuminating device which can suppress the cloudiness of glass, the deformation | transformation of an arc tube, the lifetime reduction of an arc tube, and the fall of an image quality.
[0058]
Furthermore, the lighting device 210 shown in the present embodiment is characterized in that a cooling air passage 212A and a cooling air passage 212B are provided in the lighting device housing 230 as shown in FIG.
[0059]
For this reason, according to the illuminating device 210 which concerns on this embodiment, since an optical lamp housing | casing can be made into a simple structure compared with the illuminating device which concerns on Embodiment 1-3, light source lamp replacement | exchange There is also an effect that the cost at the time can be reduced. In the present embodiment, the lighting device housing 230 is a housing that houses the entire projector optical system.
[0060]
Note that the flow path switching device in each of the embodiments described above rotates (opens and closes) each shutter by the gravitational action caused by the upside down operation of the casing of the projector, and the first cooling air passage 112B. ₁ , 212B ₁ And the second cooling air passage 112B ₂ , 212B ₂ However, the present invention is not limited to this, and as the flow path switching device, an opening / closing device having a shutter that is electrically opened / closed automatically or a shutter that is mechanically opened / closed manually is used. A switchgear having the same can be used. Further, in the former case, the first cooling air passage and the second cooling air passage can be selectively opened and closed in conjunction with the video reversing operation by the switching operation of the normal mode or the ceiling suspension mode. .
[Brief description of the drawings]
FIG. 1 is a plan view showing an optical system of a projector according to a first embodiment of the invention.
FIG. 2 is an explanatory diagram schematically showing the illumination device according to the first embodiment of the present invention.
FIG. 3 is an explanatory view showing the lighting device in a normal installation state.
FIG. 4 is an explanatory view showing the lighting device in a ceiling-mounted state.
FIG. 5 is an explanatory view schematically showing a lighting device according to Embodiment 2 of the present invention.
FIG. 6 is an explanatory diagram schematically showing a lighting apparatus according to a third embodiment of the present invention.
FIG. 7 is an explanatory view schematically showing a lighting device according to Embodiment 4 of the present invention.
FIG. 8 is a cross-sectional view showing the structure of a conventional lighting device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Projector, 100 Illumination optical system, 110, 210 Illumination device, 112, 212 Light source lamp housing, 112A, 212A Cooling air passage on the upstream side, 112B, 212B Cooling air passage on the downstream side, 112B ₁ , 212B ₁ First cooling vent, 112B ₂ , 212B ₂ Second cooling vent, 112a Light source lamp housing space, 212a Light source lamp housing space (reflector space), 112a ₁ 112a ₂ 212a ₁ 212a ₂ Distribution port, 114, 214 reflector, 114A, 214A opening, 114B, 214B Reflector space, 114C, 214C Reflection portion, 114D, 214D Non-reflection portion, 114E, 114F, 214E, 214F Distribution port, 114E ₁ 114F ₁ 214E ₁ , 214F ₁ Rectifier plate, 119, 219 Cooling device, 119A ₁ 119A ₂ 219A ₁ 219A ₂ Switchgear, 119a ₁ 219a ₁ First shutter, 119a ₂ 219a ₂ Second shutter, 119a _Three 219a _Three Third shutter, 119a _Four 219a _Four First hinge 119a _Five 219a _Five Second hinge, 119a ₆ 219a ₆ 3rd hinge, 119a ₇ 219a ₇ Fourth shutter, 119a ₈ 219a ₈ 5th shutter, 119a ₉ 219a ₉ 4th hinge, 119a _Ten 219a _Ten Fifth hinge, 116, 216 Translucent member, 118, 218 Light emitting tube, 230 Lighting device housing, 400R, 400G, 400B Liquid crystal display device, 500 Cross dichroic prism, 600 Projection optical system, a, b Relay space

Claims (6)

An illumination device for use in a projector including an arc tube that emits illumination light and capable of projecting the projector casing upside down,
In both cases of projecting with the projector housing in a normal installation state and projecting the projector housing in an upside down installation state from the normal installation state, the arc tube is caused by a downdraft. A cooling device for cooling ,
A lighting device housing having a first air passage and a second air passage for cooling;
A reflector having a plurality of flow ports arranged in the lighting device housing and capable of communicating with both the air passages;
With
The cooling device has a flow path switching device for forming only a downdraft in the reflector,
The flow path switching device comprises an opening / closing device that selectively opens and closes both the air passages . The illuminating device according to claim 1 , wherein the circulation port is disposed above and below the reflector. 3. The lighting device according to claim 2 , wherein the opening / closing device includes a shutter that opens and closes by an upside down operation of a casing of the projector. 4. The lighting device according to claim 2 , wherein the opening / closing device includes a shutter that is automatically or manually opened / closed. The illuminating device according to any one of claims 2 to 4 , wherein the reflector is provided with a circulation port that opens on a side opposite to a light beam emission direction. An illumination device that emits illumination light;
A color separation optical system for separating the illumination light emitted from the illumination device into a plurality of color lights;
A plurality of electro-optic modulation devices that form images by modulating each color light separated by the color separation optical system;
A color synthesizing optical system for synthesizing modulated light emitted from the plurality of electro-optic modulation devices;
In a projector including a projection optical system that projects and displays an image synthesized by the color synthesis optical system on a projection surface,
Projectors, wherein the illumination device is an illumination device according to any one of claims 1-5.

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