JP2005249930A - Light source device and projection display device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the temperature difference between the upper part and the lower part of a light-emitting tube for stable prevention of light emission of rupture/swelling of a light source device (lamp) due to high temperature, prevention of flickers or the like due to supercooling, regardless of installation attitude. <P>SOLUTION: Light from a discharge lamp 8 is irradiated by a concave reflection mirror 6 in one direction. The concave reflection mirror 6 is provided with two intake and exhaust openings 6a and 6b by possessing the angle of substantially 180 degrees at a position upward and downward of the neighborhood of the opening part of an irradiation direction. The light source device comprises a blowing fan 1 for generating cooling wind for cooling the discharge lamp 8 and two intake and exhaust ducts 2a and 2b, of which one end is connected and branched to a blowing opening 1a of the blowing fan 1 and the other end is connected to the two intake and exhaust openings 6a and 6b of the concave reflecting mirror 6. Furthermore, the light source device is provided with an air exhaust opening 3 at each of the two intake and exhaust ducts 6a and 6b or a branched part, and is provided with an intake and exhaust switch valve 4 for changing the two intake and exhaust ducts 6a and 6b for intaking or exhausting in the neighborhood of the branched part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cooling structure for a light source device used in an image projection display device (hereinafter referred to as a projection display device) including a light source device having a lamp, in addition to a liquid crystal projector, a projector equipped with a switching device with a small mirror, and the like. It is.

  In the light source device of the conventional liquid crystal projector, when the liquid crystal projector is installed upside down by providing a duct having an air discharge port provided with a shielding plate that slides up and down by its own weight on the front side surface of the lamp. There is a cooling structure that switches the blowing position by its own weight and cools the high temperature portion of the arc tube surface of the lamp, that is, the upper surface (see, for example, Patent Document 1).

  Further, in another conventional light source device, a ventilation port is provided on a horizontal side surface near the front opening of the concave reflecting mirror, and a duct having a wind direction control plate that is rotatable by its own weight is provided adjacent to the ventilation port. Therefore, there is also reported a configuration in which the air blowing position is switched by its own weight to cool the high temperature portion of the arc tube surface of the lamp, that is, the upper surface (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 10-23355 (page 4-5, FIG. 3)

JP 2002-298639 A (page 3-4, FIG. 1)

The light source device of the conventional projection display device is configured such that more cooling air is applied to a position located above the arc tube. The reason for this is as follows.
That is, when an ultra-high pressure mercury lamp is used as the light source device, for example, the temperature of the arc tube is normally about 150 to 200 degrees higher than the lower part in the natural lighting state. Problems are likely to occur. Therefore, it is intended to reduce the temperature difference between the upper and lower parts of the arc tube and bring it to an appropriate temperature state by solving cooling and other problems by applying cooling air to the upper part of the arc tube. .

  On the other hand, the projection display device has an opportunity to be used in an original normal posture (hereinafter referred to as a floor-mounted state) and an inverted posture (hereinafter referred to as a ceiling-suspended state) inverted 180 degrees. In this case, in the floor-mounted state, the portion corresponding to the upper part of the arc tube becomes the lower part of the arc tube in the suspended state. For this reason, in a light source device that is not intended to be switched between use in a floor-mounted state and use in a ceiling-suspended state, when used in a ceiling-suspended state, cooling air hits the lower part of the arc tube. As a result, not only the upper part of the arc tube is sufficiently cooled, but also the lower part of the arc tube is further cooled, and the upper part of the arc tube is heated and the lower part of the arc tube is overcooled. Causes problems such as whitening, blackening, or blistering, leading to worst or damage. In addition, in the lower part of the arc tube, light emission failure occurs due to mercury that cannot be evaporated inside the arc tube, causing flicker.

In order to solve such a problem, the conventional technology has proposed a cooling structure that considers switching between a floor-mounted state and a ceiling-suspended state.
However, in the conventional light source device, the opening for introducing the cooling air into the lamp is provided in the horizontal direction of the side surface of the lamp, and more cooling air is introduced into the entire space located in the upper part of the lamp. Since the configuration is adopted, it is impossible to efficiently cool only the upper part of the arc tube by applying the cooling air only to the upper part of the arc tube located in a limited place of the discharge lamp. Therefore, the cooling of the upper part of the arc tube is controlled only by the difference in the amount of cooling air flow, and the temperature of the arc tube itself increases due to further downsizing of the projection display device and higher brightness. It is difficult to sufficiently correct the further temperature difference at the bottom.

  Also, if the cooling air volume is further increased to bring the upper part of the arc tube to an appropriate temperature state, the entire lamp is filled with a large amount of cold air, and the heating state of the upper part of the arc tube is eliminated, but the light emission The lower part of the tube is supercooled. Accordingly, the problems such as whitening, blackening or blistering occur, and the problem of the worst or breakage is solved. Further, in the lower part of the arc tube, light emission failure occurs due to mercury that cannot be evaporated inside the arc tube, and flicker occurs. It is difficult to solve the problem that causes the problem.

  The present invention has been made to solve the above-described problems of the prior art, and can be efficiently performed only on the upper part of the arc tube in a floor-mounted state or a ceiling-mounted state, regardless of the installation state of the projection display device. A light source device that is configured to be able to apply cooling air, and as a result, efficiently cools the upper part of the arc tube to an appropriate temperature and reduces the temperature difference between the upper and lower parts of the arc tube. It is another object of the present invention to provide a projection display device including the light source device.

  A light source device according to the present invention irradiates light from a discharge lamp that emits light in one direction, and has an angle of approximately 180 degrees at positions above and below the opening in the irradiation direction. A concave reflecting mirror provided with two air supply / exhaust ports, a blower fan for generating cooling air for cooling the discharge lamp, one end of which is connected and branched to the blower opening of the blower fan, and the other end of the concave reflector. Two supply / exhaust ducts connected to the two supply / exhaust ports, an air discharge port provided at each of the two supply / exhaust ducts or at a branch point of the two supply / exhaust ducts, and the two supply / exhaust ducts And a supply / exhaust switching valve provided in the vicinity of a branch point of the two supply / exhaust ducts.

  The light source device according to the present invention is provided with two supply / exhaust ducts that can be switched for supply and exhaust, respectively, and is provided at an upper and lower position near the irradiation direction opening of the concave reflecting mirror with an angle of approximately 180 degrees. By directly blowing the cooling air from the blower fan into one of the two air supply / exhaust ports, the discharge lamp arc tube can be mounted on the floor or suspended from the ceiling regardless of the installation state of the projection display device. The cooling air can be efficiently applied only to the upper part, and the warm air heated by the arc tube can be efficiently exhausted by the other air supply / exhaust pipe, so that only the upper part of the arc tube can be efficiently cooled. Cooling air path can be set.

  For this reason, problems such as whitening, blackening or blistering occur, and the problem of the worst and breakage is solved.Furthermore, in the lower part of the arc tube, light emission failure occurs due to mercury that cannot be evaporated inside the arc tube, and flicker occurs. By solving the problem of causing the occurrence, the light emission performance of the light source device can be further stabilized in any state of installation.

An embodiment of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a diagram schematically showing a configuration of a light source device of a projection display device according to a first embodiment. FIG. 1 is a sectional view of the light source device as seen from the side. In FIG. 1, the blower fan 1 generates cooling air for cooling the arc tube 9 to be described later, and includes, for example, a sirocco fan. The supply / exhaust duct 2 includes a first supply / exhaust duct 2 a and a second supply / exhaust duct 2 b, and one end thereof is attached and branched to the blower opening 1 a of the blower fan 1. An air discharge port 3 is provided at a branch point of the two supply / discharge ducts 2. The supply / exhaust switching valve 4 is provided in the vicinity of the branch point of the two supply / exhaust ducts 2 and switches the two supply / exhaust ducts 2 for supply or exhaust. The one set for air and the blower port 1a of the blower fan 1 are passed through, and the other set for exhaust and the air discharge port 3 are passed through. The supply / discharge switching valve 4 is attached so as to be able to rotate by gravity in a state where the center of gravity and the fulcrum are shifted by the supply / discharge switching valve support shaft 5.

In FIG. 1, a lamp device 7 irradiates light on the front surface. The lamp device 7 emits light and irradiates light from the discharge lamp 8 in one direction, and the reflecting surface is spherical, parabolic or elliptical. A concave reflecting mirror 6 composed of a surface and a front glass 13 provided to cover the front opening of the concave reflecting mirror 6, that is, the opening in the irradiation direction, for explosion protection. The discharge lamp 8 is attached by a lamp holding member 15 to a lamp insertion opening 14 located opposite to the opening in the irradiation direction of the concave reflecting mirror 6.
The first supply / exhaust duct 2a and the second supply / exhaust duct 2b are provided with two angles provided at an angle of approximately 180 degrees in the vicinity of the front opening of the concave reflecting mirror 6 so as not to obstruct the optical path. The first air supply / exhaust port 6a and the second air supply / exhaust port 6b are connected to the air supply / exhaust ports, respectively.

  FIG. 2 is a structural diagram showing the structure of the lamp device 7 in detail. In the figure, for example, a discharge lamp 8 such as a high-pressure mercury lamp is sealed to keep the arc tube 9 provided with a pair of electrodes 9a and 9b and a conductive foil in close contact with glass to keep the arc tube 9c and the outside confidential. It consists of parts 10a and 10b. Since the electrodes 9a and 9b being turned on have a high temperature of 2500 to 3000 degrees, tungsten or the like having a small thermal evaporation is used. Moreover, quartz glass etc. which were excellent in heat resistance are used for the glass which comprises the said discharge lamp 8. FIG. In the case of a high-pressure mercury lamp, the arc tube interior 9c is filled with a rare gas such as mercury, argon or xenon, or a halide. In order to establish conduction between the sealing portions 10a and 10b and the conductive foil, lead rods 11a and 11b protrude outward from the glass members of the sealing portions 10a and 10b, respectively. Further, the lead rods 11a and 11b are connected to the lead wires 12a and 12b, respectively. When electric power is supplied from the lead wires 12a and 12b, an arc is formed between the electrodes 9a and 9b, and the discharge lamp 8 emits light.

  The concave reflecting mirror 6 has a reflecting surface formed of, for example, a metal film or a dielectric multilayer film that efficiently reflects light in the visible light region on the inner surface of borosilicate glass or crystallized glass as a base material. When the discharge lamp 8 is a high-pressure mercury lamp, the arc tube interior 9c that is turned on has a high pressure of 100 to 200 atmospheres due to the vapor pressure of vaporized mercury. For this reason, in the unlikely event that the discharge lamp 8 is ruptured, the light that covers the front opening of the concave reflecting mirror 6 and transmits the light emitted from the arc tube 9 in order to prevent the glass and electrodes from scattering. The front glass 13 which is one of the transmissive members is provided.

  The lamp insertion opening 14 is formed at the base of the central axis of the concave reflecting mirror 6, and the discharge lamp 8 fixed to the lamp holding member 15 with an adhesive is inserted into the lamp insertion opening 14. Then, the discharge lamp 8 is held on the central axis portion of the concave reflecting mirror 6 by fixing it to the concave reflecting mirror 6 with an adhesive.

  FIG. 3 is a schematic view for explaining the supply / discharge switching valve support shaft 5. As shown in FIG. 3A, the supply / exhaust switching valve support shaft 5 is provided near the center of the supply / exhaust switching valve 4. For example, different materials are used on both sides of the supply / exhaust switching valve support shaft 5 to increase the specific gravity. By changing the position, the center of gravity shifts from the center and can be rotated by the action of gravity. Apart from this, as shown in FIG. 3 (b), for example, the same material is used, and the position of the supply / discharge switching valve support shaft 5 is shifted from the center position, that is, the position of the center of gravity. You may make it become. Furthermore, as shown in FIG. 3C, in addition to shifting the center of gravity position by changing the material on both sides of the supply / discharge switching valve support shaft 5, the supply / discharge switching valve support shaft 5 sandwiches the center position. It may be arranged so that it can be rotated by the action of gravity by being arranged on the side opposite to the position of the center of gravity. In other words, if the supply / discharge switching valve 4 is fixed by the supply / discharge switching valve support shaft 5 so that the center of gravity is shifted from the fulcrum, the supply / discharge switching valve support shaft 5 is connected to the supply / discharge switching valve 4. It does not have to be provided near the center.

  In the light source device configured as described above, when the projection display device is installed on the floor, the supply / exhaust switching valve support shaft 5 is moved by the action of gravity so that the wall surface of the blower port 1a and the first supply / exhaust duct 2a. The air supply port 1a and the first supply / exhaust duct 2a pass through due to the stable effect of the supply / exhaust switching valve 4 in contact with the wall surface. Therefore, the cooling air from the blower fan 1 is guided in the lamp device 7 along the floor-mounted cooling air passage 16 passing through the air blowing port 1a, the first air supply / exhaust duct 2a, and the first air supply / exhaust port 6a. It is burned. The cooling air introduced into the lamp device 7 hits the upper inner surface of the concave reflecting mirror 6 facing the first air supply / exhaust port 6a, and is a positive part that corresponds to the upper surface when the arc tube 9 of the discharge lamp 8 is placed on the floor. It flows from the upper part 17 toward the reverse upper part 18 which is a part corresponding to the lower surface, and further hits the inner surface of the lower part of the concave reflecting mirror 6 and returns to the second air supply / exhaust port 6b.

  The air heated in the lamp device 7 is provided in the vicinity of the branch point between the first supply / exhaust duct 2a and the second supply / exhaust duct 2b through the second supply / exhaust port 6b and the second supply / exhaust duct 2b. The air is discharged from the air outlet 3 to the outside of the apparatus.

  Next, when the projection display device is installed in a suspended state, the vertical relationship of the light source device is inverted by 180 degrees from that in the case where the light source device is installed on the floor. That is, the supply / discharge switching valve support shaft 5 is brought into contact with the wall surface of the blower opening 1a and the wall surface of the second supply / discharge duct 2b by the action of gravity, and the blower opening 1a is operated by the stable operation effect of the supply / discharge switching valve 4. And the second supply / discharge duct 2b penetrates. Therefore, the cooling air from the blower fan 1 is guided in the lamp device 7 along the ceiling cooling air passage 19 passing through the air blowing port 1a, the second air supply / exhaust duct 2b, and the second air supply / exhaust port 6b while maintaining the air force. It is burned. The cooling air guided into the lamp device 7 turns back against the upper inner surface of the concave reflecting mirror 6 facing the second air supply / exhaust port 6b, and is a reverse portion corresponding to the upper surface when the arc tube 9 of the discharge lamp 8 is suspended from the ceiling. It flows from the upper part 18 toward the front upper part 17 which is a part corresponding to the lower surface, and further turns back against the inner surface of the lower part of the concave reflecting mirror 6 and exits to the second air supply / exhaust port 6b.

  The air heated in the lamp device 7 is provided in the vicinity of the branch point between the first supply / exhaust duct 2a and the second supply / exhaust duct 2b through the first supply / exhaust port 6a and the first supply / exhaust duct 2a. The air is discharged from the air outlet 3 to the outside of the apparatus.

  Therefore, even when the projection display device is installed on the floor or in a ceiling-mounted state, the cooling air from the blower fan 1 reliably draws a stable air path while maintaining the wind force. From the upper surface of the arc tube 9 to the lower surface. Therefore, the upper part of the arc tube 9 can be efficiently cooled, and the temperature difference between the upper part and the lower part of the arc tube 9 can be corrected. As a result, the arc tube 9 can be maintained at an appropriate temperature state, and problems such as whitening, blackening or swelling of the arc tube 9 or occurrence of flicker are eliminated, and it is extremely stable regardless of the installation state. It is possible to provide a light source device having the light emission performance.

Here, as the discharge lamp 8, a high-pressure mercury lamp used as a lamp light source of about 100 to 400 W, for example, is mentioned. However, it is a lamp light source such as a metal halide lamp or a xenon lamp of about 1 KW used for large equipment. It doesn't matter.
Moreover, although the sirocco fan was mentioned as the said ventilation fan 1, for example, what can generate | occur | produce cooling air, such as an axial flow fan, may be used.

  Further, by providing a forced exhaust fan (not shown) in the vicinity of the air discharge port 3 to exhaust the heated air forcibly, the upper portion of the arc tube 9 can be cooled more efficiently, and the arc tube 9 The temperature difference between the upper part and the lower part can be further corrected. As a result, the arc tube 9 can be kept at a more appropriate temperature state.

  The first supply / exhaust duct 2a and the second supply / exhaust duct 2b are installed so as to be separated from each other in the vertical direction. Even if it is a thing, it may have the structure which has the said two supply / exhaust ducts, and is switched to the object for supply or exhaust by the said supply / exhaust switching valve 4. FIG.

  The first supply / exhaust duct 2a and the second supply / exhaust duct 2b are fixed at positions where the first supply / exhaust port 6a and the second supply / exhaust port 6b are in contact with the outer surface of the lamp device 7. However, if it is a position that does not hinder the light path from the arc tube 9, in order to make the floor cooling air passage 16 and the ceiling cooling air passage 19 more stable and reliable, It may be fixed with the end of the duct introduced.

  Further, the two supply / exhaust ducts 2 are attached to the blower opening 1a of the blower fan 1 in such a manner as to be branched into the first supply / exhaust duct 2a and the second supply / exhaust duct 2b at the portion of the blower opening 1a, The supply / exhaust switching valve 4 is provided in the vicinity of the branch point of the air blowing port 1a, the first supply / exhaust duct 2a, and the second supply / exhaust duct 2b by the supply / exhaust switching valve support shaft 5, as shown in FIG. The common duct 20 is provided between the air outlet 1a and the first supply / exhaust duct 2a and the second supply / exhaust duct 2b, and the supply / exhaust switching valve 4 is provided in the vicinity of the branch point of the first supply / exhaust duct 2a and the second supply / exhaust duct 2b. However, the same effect can be obtained even if it is provided with a structure that is supported by the supply / discharge switching valve support shaft 5.

  Also, here, the first air supply / exhaust port 6a and the second air supply / exhaust port 6b have holes of approximately 180 degrees at positions that do not obstruct the upper and lower optical paths near the front opening of the concave reflecting mirror 6. However, it may be formed by combining the front glass 13 with a cutout of the concave reflecting mirror 6 provided at the same position. Further, as shown in FIG. 5, a cylindrical structure 21 is provided so as to cover the space between the front glass 13 and the opening in the irradiation direction of the concave reflecting mirror 6, and the first supply is provided to the cylindrical structure 21. A similar effect can be obtained even if the exhaust port 6a and the second air supply / exhaust port 6b are provided.

Embodiment 2. FIG.
In the first embodiment, the air discharge port 3 is provided in the vicinity of the branch point between the first supply / exhaust duct 2a and the second supply / exhaust duct 2b, and the supply / exhaust switching valve 4 is used for exhausting the two supply / exhaust ducts 2. In the second embodiment, as shown in FIG. 6, the first air discharge port 3a and the first air discharge port 3a are arranged in the middle of the paths of the two supply / discharge ducts 2a and 2b. The case where the 2nd air discharge port 3b is provided is shown.
The first air discharge port 3a and the second air discharge port 3b are provided independently at arbitrary positions of the two supply / discharge ducts 2a and 2b. Each of the first air discharge port 3a and the second air discharge port 3b has a first supply / discharge switching valve 4a and a second supply / discharge switching valve 4b that are fixed at one end so as to be rotatable and can be opened and closed by the action of gravity. Prepare. The first supply / exhaust switching valve 4a and the second supply / exhaust switching valve 4b allow warm air to be exhausted at any position in the first supply / exhaust duct 2a and the second supply / exhaust duct 2b. In addition to the first effect, the design and installation flexibility of the light source device can be expanded.

Embodiment 3 FIG.
FIG. 7 shows Embodiment 3 of the present invention. In the first embodiment, even when the projection display device is installed in a floor-mounted state or in a ceiling-mounted state, the air heated in the lamp device 7 is The air is discharged from an air discharge port 3 provided in the vicinity of the branch point between the first supply / discharge duct 2a and the second supply / discharge duct 2b. According to the present embodiment, by connecting the discharge duct 22 for discharging air to the air discharge port 3, the air heated in the lamp device 7 can be arbitrarily transferred inside and outside the projection display device. It can be guided to a location and discharged at that location. By adopting such a configuration, not only can the degree of freedom of design and installation of the light source device be increased, but also the lamp device can be obtained by directly discharging the air heated in the lamp device 7 to the outside of the projection display device. It is possible to prevent the air heated inside 7 from being directly discharged into the projection display device, and to suppress the temperature rise in the projection display device. Therefore, the temperature of the cooling air from the blower fan 1 can be further lowered, the upper part of the arc tube 9 can be cooled more efficiently, and the temperature difference between the upper and lower parts of the arc tube 9 can be further corrected. it can. As a result, the arc tube 9 can be kept at a more appropriate temperature state, and a light source device having more stable light emission performance can be provided.

  In addition, here, the configuration in which the discharge duct 22 for discharging air to the air discharge port 3 is shown, but the first air discharge port 3a and the second air discharge port 3b shown in the second embodiment are connected. It may be configured to connect to each other.

  Further, by providing a forced exhaust fan near the discharge port of the discharge duct 22 to exhaust the heated air, the upper part of the arc tube 9 can be cooled more efficiently and the upper part of the arc tube 9 can be cooled. And the temperature difference at the bottom can be further corrected. As a result, the arc tube 9 can be kept at a more appropriate temperature state.

Embodiment 4 FIG.
FIG. 8 is a view showing an embodiment of another embodiment in which at least one exhaust port is provided in the vicinity of a holding portion of a discharge lamp having an arc tube held at the central axis portion of the concave reflecting mirror 6. In FIG. 8, the lamp holding member 15 is provided with two exhaust ports, a first exhaust port 15 a and a second exhaust port 15 b, and each exhaust port is connected to the lamp insertion opening 14. For this reason, part or all of the air heated in the lamp device 7 can be exhausted directly outside the lamp device 7 without passing through the duct. By having such a structure, it becomes possible to select a cooling air path that is more suitable for the installation environment of the projection display device, and while maintaining the cooling performance of the upper part of the arc tube 9, the projection type more suitable for the environment A display device can be provided.

  Furthermore, for example, there are cases where the air blower fan 1 must be used in a quiet environment, although the air condition is effective. In such a case, as shown in FIG. 9, for example, in the case of a floor-standing state, the control of the supply / discharge switching valve 4 is controlled opposite to that in the first embodiment, that is, the supply / discharge switching valve 4. By reversing the position of the center of gravity of the first embodiment, the supply / exhaust switching valve 4 comes into contact with the wall surface of the blower opening 1a and the second supply / discharge duct 2b by the action of gravity and is stabilized. It will be in the state which 1a and the 2nd supply / exhaust duct 2b penetrated. Cooling air from the blower fan 1 is generated with a reduced wind force, and the inside of the lamp unit 7 along the floor-mounted reverse cooling air passage 40 passing through the blower port 1a, the second supply / exhaust duct 2b, and the second supply / exhaust port 6b. Since the wind force from the blower fan 1 is weakened, it is hardly reflected on the lower inner surface of the concave reflecting mirror 6 and flows along the upper inner surface of the concave reflecting mirror 6. After the front upper portion 17 which is the corresponding portion is efficiently cooled, it is discharged through the first exhaust port 15a and the second exhaust port 15b.

  By selecting such a cooling air path, the noise of the blower fan 1 can be reduced, and a projection display device suitable for a quiet environment can be provided. In addition, although the noise environment is illustrated here, the range in which a more suitable cooling air passage can be selected widens depending on conditions such as the room temperature and the temperature distribution in the projection display device.

  Further, here, the case where the first exhaust port 15a and the second exhaust port 15b are in the open state has been described. For example, the opening area can be varied in the exhaust port opening, for example, a bellows type or a slide type. By providing the shutter or cover, it is possible to adjust the opening area of the exhaust opening, and to further increase the degree of freedom in selecting the cooling air path.

  Further, by providing at least one forced exhaust fan in the vicinity of the first exhaust port 15a and the second exhaust port 15b to exhaust the heated air, the degree of freedom in selecting the cooling air path is further increased. The upper part of the arc tube 9 can be cooled more efficiently.

  Further, at least one exhaust control valve that fixes one end rotatably so as to cover the first air supply / exhaust port 6a and / or the second air supply / exhaust port 6b and restricts exhaust that can be opened and closed by the action of gravity is provided. By providing, air is supplied from either the first air supply / exhaust port 6a or the second air supply / exhaust port 6b, and is discharged directly from the other air supply / exhaust port without cooling the upper portion of the arc tube 9. Even if there is a simple cooling air, by restricting such a cooling air, all of the supplied cooling air can be used for cooling the upper portion of the arc tube 9. FIG. 10 is a diagram showing an example of such a structure. In FIG. 10, a first exhaust control valve 23 and a second exhaust control valve 24 are provided in each of the first air supply / exhaust port 6a and the second air supply / exhaust port 6b.

Embodiment 5 FIG.
In FIG. 11, a part or all of the supply / exhaust switching valve 4 is constituted by a permanent magnet, a magnetic material, or an electromagnet that can control magnetic force. It is the figure which showed an example of embodiment provided with the at least 2 permanent magnet or the at least 1 electromagnet which can control magnetic force in the inner surface or outer surface of the part which contact | connects at least 1 of the exit 3. FIG. In FIG. 11, when the projection type display device is installed on the floor, the supply / exhaust switching valve 4, all of which is made of a magnetic material, is switched by its own weight, the upper inner surface of the blower opening 1 a of the blower fan 1, It is fixed in a stable state by permanent magnets 25a, 25b provided on the outer surface portions of the portions that are in contact with the outer surface of one supply / discharge duct 2a. Further, when the projection display device is installed in a suspended state, the discharge switching valve 4 is operated by the action of gravity, and is in the vicinity of being in contact with the blower port 1a of the blower fan 1 and the first supply / discharge duct 2a. It is fixed in a stable state by permanent magnets 26a and 26b provided on the outer surface portion.

  By adopting such a configuration, it is possible to maintain a more stable state by fixing the supply / discharge switching valve 4 by the magnetic force in addition to the action of gravity, for example, when the installation state is not completely horizontal Even when installed in a place where shaking occurs, the supply / discharge switching valve 4 can be fixed in a more stable state. Furthermore, by strengthening the magnetic force, it becomes possible to fix the supply / discharge switching valve 4 against the action of gravity due to its own weight, and in a special environment, it is not possible to take an air path opposite to the original cooling air path. Even in the case where the value is not obtained, the supply / discharge switching valve 4 can be fixed in a stable state.

  Moreover, although the whole part of the supply / exhaust switching valve 4 was comprised with the magnetic body here, the structure which has arrange | positioned four permanent magnets on the outer surface of the part which contact | connects the ventilation port 1a of the ventilation fan 1 or the supply / exhaust duct 2 was illustrated. If there are at least two permanent magnets, the same function is achieved. Further, a part or all of the supply / exhaust switching valve 4 is constituted by a permanent magnet, and the corresponding part or all of the blowing port 1a of the blower fan 1 and the supply / exhaust duct 2 is constituted by a magnetic material or a permanent magnet. Effects can be obtained.

  Furthermore, as shown in FIG. 12, in place of the permanent magnets 25a, 25b, 26a, 26b, four independent electromagnets 27a, 27b, 28a, 28b capable of controlling magnetic force are arranged, and a part of the supply / discharge switching valve 4 or All parts may be constituted by a permanent magnet, a magnetic material, or an electromagnet capable of controlling magnetic force. In this case, the magnetic force and polarity of the four electromagnets 27a, 27b, 28a, 28b can be controlled independently, and the supply / discharge switching valve 4 is fixed in a more optimal stable state according to the installation state of the projection display device. can do. Of course, the magnetic force and polarity of the four electromagnets 27a, 27b, 28a, 28b may be collectively controlled so as to be in the same state as the permanent magnets 25a, 25b, 26a, 26b.

  Further, as shown in FIG. 13, the same effect can be obtained even if the above-mentioned 27a and 28a are constituted by one common electromagnet 29 and the above-mentioned 27b and 28b are constituted by one common electromagnet 30. In this case, for example, a part of the supply / exhaust switching valve 4, specifically, the part that contacts the air outlet 1 a and the air supply / exhaust duct 2 is the south pole of the permanent magnet, and the air outlet 1 a of the electromagnet 29 and the electromagnet 30 By controlling so that the polarity is switched at the portion in contact with the duct 2, a force that pulls or repels the supply / discharge switching valve 4 is generated, so that the supply / discharge switching valve 4 can be controlled more quickly. Further, as shown in FIG. 14, the above-mentioned 27a and 28b are constituted by one common electromagnet 31, and the above-mentioned 27b and 28a are constituted by one common electromagnet 32. can get.

  In order to obtain the effects as described above, a part or all of the supply / exhaust switching valve 4 is constituted by a permanent magnet, a magnetic material, or an electromagnet capable of controlling magnetic force, and the supply / exhaust switching valve 4 is blown by the blower fan 1. What is necessary is just to comprise so that a permanent magnet or the electromagnet which can control magnetic force may be arrange | positioned in the inner surface or outer surface of the part which contact | connects at least 1 point of the opening | mouth 1a or the supply / exhaust duct 2. FIG.

  The common duct 20 shown in FIG. 4 and the discharge duct 22 shown in FIG. 7 can also have the same configuration as described above. Furthermore, at least one first supply / discharge switching valve 4a and at least one second supply / discharge switching valve 4b shown in FIG. 6, and the first exhaust control valve 23 and second exhaust control valve 24 shown in FIG. Can be provided with the same function by adopting the same configuration.

Embodiment 6 FIG.
FIG. 15 is a structural diagram showing an outline of the liquid crystal projector 100 of the present invention. FIG. 15 shows the case where the light source device including the discharge duct 22 shown in FIG. 7 is used, but the light source devices shown in other embodiments can be applied.
In FIG. 15, the lamp device 7 is fixed in a state where it is mounted in the lamp box 33. The first supply / exhaust duct 2a (not shown) and the second supply / exhaust duct 2b provided at a position facing the first supply / exhaust duct 2a across the lamp box 33 are located at positions that do not obstruct the optical path. The lamp box 33 is connected. Here, as described above, the cooling air from the blower fan 1 is introduced into the lamp device 7 through the first supply / exhaust duct 2a or the second supply / exhaust duct 2b and then arranged along the lamp box 33. It is discharged from the discharge duct 22.

  The light emitted in one direction from the lamp device 7 is separated into red, blue, and green light through a mirror, a dichroic mirror (not shown) provided in the optical system 34, and the R liquid crystal panel 36a, The image display means including the G liquid crystal panel 36b and the B liquid crystal panel 36c is irradiated. As a result, the image and light corresponding to each of red, blue, and green are combined to form red, blue, and green image lights. Thereafter, the image light of red, blue, and green is further combined by the prism 35 into one image light, which is enlarged and projected onto a screen (not shown) or the like through the projection lens 37.

The video processing device 40 performs video processing based on the input signal in order to display the video on the red, blue, and green R liquid crystal panel 36a, G liquid crystal panel 36b, and B liquid crystal panel 36c (image display means), respectively. . The ballast power supply 38 supplies a pulse current to the lamp device 7, and the circuit power supply device 41 supplies a drive current to the video processing device 40.
The discharge fan 39 discharges warm air from the discharge duct 22 and the ballast power source 38 to the outside of the liquid crystal projector 100. The circuit power supply cooling fan 42 cools the circuit power supply device 41. The liquid crystal cooling duct 43 includes a liquid crystal cooling fan 44 for supplying cooling air, and cools each liquid crystal panel intensively by applying the cooling air to the liquid crystal panels 36a, 36b, 36c.

It is sectional drawing of the light source device in Embodiment 1 of this invention. It is sectional drawing of the lamp device in Embodiment 1 of this invention. It is a figure which shows the supply / discharge switching valve of the light source device in embodiment of this invention. It is sectional drawing at the time of providing the common duct in the light source device in Embodiment 1 of this invention. It is sectional drawing at the time of providing a cylindrical structure in the lamp device in Embodiment 1 of this invention. It is sectional drawing of the light source device in Embodiment 2 of this invention. It is sectional drawing of the light source device in Embodiment 3 of this invention. It is sectional drawing of the lamp device in Embodiment 4 of this invention. It is sectional drawing of the light source device in Embodiment 4 of this invention. It is sectional drawing at the time of providing the exhaust control valve in the light source device in Embodiment 4 of this invention. In the light source device in Embodiment 5 of this invention, it is sectional drawing at the time of providing a permanent magnet. In the light source device in Embodiment 5 of this invention, it is sectional drawing at the time of providing an electromagnet. In the light source device in Embodiment 5 of this invention, it is sectional drawing at the time of providing an electromagnet. In the light source device in Embodiment 5 of this invention, it is sectional drawing at the time of providing an electromagnet. It is a block diagram of the projection type display apparatus provided with the light source device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air blower, 1a Air outlet, 2 Supply / exhaust duct, 2a 1st supply / exhaust duct, 2b 2nd air supply / exhaust duct, 3 Hot air exhaust port, 3a 1st hot air exhaust port, 3b 2nd hot air exhaust port, 4 Supply / exhaust switching valve, 4a First supply / exhaust switching valve, 4b Second supply / exhaust switching valve, 5 Supply / exhaust switching valve support shaft, 6 Concave reflector, 6a First supply / exhaust port, 6b Second supply / exhaust port, 7 Lamp Device, 8 Discharge lamp, 9 Luminescent tube, 13 Front glass, 15 Lamp holding member, 16 Floor cooling air passage, 19 Ceiling cooling air passage, 22 Discharge duct, 25a / 25b / 26a / 26b Permanent magnet, 27a / 27b・ 28a ・ 28b ・ 29-32 Electromagnet, 34 Optical system, 100 Liquid crystal projector.

Claims (4)

A discharge lamp that emits light;
A concave reflecting mirror that irradiates light from the discharge lamp in one direction and has two air supply / exhaust ports at an angle of approximately 180 degrees in the vicinity of the opening in the irradiation direction;
A blower fan that generates cooling air for cooling the discharge lamp;
Two supply / exhaust ducts, one end of which is connected and branched to the air outlet of the blower fan, and the other end of which is connected to the two air supply / exhaust ports of the concave reflecting mirror;
An air outlet provided at each of the two supply / exhaust ducts or at a branch point of the two supply / exhaust ducts;
A light source device comprising: a supply / exhaust switching valve provided near a branch point of the two supply / exhaust ducts for switching the two supply / exhaust ducts to supply or exhaust. The light source device according to claim 1, wherein the air discharge port includes a discharge duct for discharging air. A part or all of the supply / exhaust switching valve is constituted by a permanent magnet, a magnetic body, or an electromagnet capable of controlling magnetic force, and the supply / exhaust switching valve is at least one of the blower port, the supply / discharge duct, and the air discharge port of the blower fan. The light source device according to claim 1, wherein at least two permanent magnets or at least one electromagnet capable of controlling magnetic force is provided on an inner surface or an outer surface of a portion in contact with the light source device. The light source device according to any one of claims 1 to 3,
An optical system for projecting image light by irradiating image display means with light emitted from the light source device;
Video processing means for displaying video on the image display means;
A projection display device comprising: a power source means for supplying current to the light source device and the image processing means.

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