JP2011209382A - Light source device and projector - Google Patents

Abstract

Provided are a light source device and a projector in which warmed cooling air is efficiently discharged to the outside to improve the cooling efficiency of an arc tube and extend its life.
A light source device includes a light emitting tube that emits a light beam, a reflector having a reflecting surface that fixes the light emitting tube and reflects the light beam, and a holding member that holds the reflector. The holding member 40 is an air inlet 46 that introduces cooling air for cooling the arc tube 20 into the reflector space 36 surrounded by the holding member 40 and the reflecting surface 31, and the cooling air from the reflector space 36. An exhaust port 48 for discharging and a rectifying plate 56 that is provided on the exhaust port 48 side and guides the cooling air that has cooled the arc tube 20 to the exhaust port 48 are provided.
[Selection] Figure 4

Description

  The present invention relates to a light source device and a projector.

  In the light source device used for the projector, the arc tube needs to be cooled. If the temperature of the arc tube rises too much due to insufficient cooling, the arc tube will be damaged or deteriorated. Therefore, a configuration is used in which cooling air is introduced into a space formed by the reflector and the holding member to cool the arc tube, and the cooling air warmed by cooling the arc tube is discharged out of the space. In order to efficiently cool the arc tube, for example, a rectifying plate for controlling the flow of the cooling air is provided on the side where the cooling air is introduced. The configuration such as the shape and arrangement of the current plate is appropriately set according to the shape of the member on the introduction side, the positional relationship with the cooling device, and the like.

  The rectifying plate is generally provided on the side where the cooling air is introduced, but a configuration in which the rectifying plate is also provided on the holding member (light source lamp housing) on the side where the cooling air is discharged has been proposed (for example, Patent Documents). 1). The projector described in Patent Document 1 includes two rectifying plates having the same configuration as each other, and cools in a stationary posture that is used by being placed on a desk or the like and a ceiling-suspended posture that is suspended from a ceiling or the like. The side where the wind is introduced and the side where it is discharged are interchanged.

Japanese Patent No. 4281429

  However, the flow of cooling air is not necessarily the same between the introduction side and the discharge side due to the shape of the members, the positional relationship with the cooling device, and the like. As described above, when the two rectifying plates have the same configuration, even if the cooling air can be controlled well on the introduction side, the cooling air heated by cooling the arc tube on the discharge side can be controlled well. It may not be possible. If the cooling air is not discharged well, the internal pressure increases and the introduction of the cooling air from the intake port is hindered, and the arc tube is insufficiently cooled, so that the temperature in the space portion increases. As a result, there is a problem that the arc tube is damaged or deteriorated.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A light source device according to this application example includes an arc tube that emits a light beam, a reflector having a reflecting surface on which the arc tube is fixed and reflecting the light beam, a holding member that holds the reflector, The holding member includes an air inlet that introduces cooling air for cooling the arc tube into a space surrounded by the holding member and the reflecting surface, and the cooling air for the space. An exhaust port that discharges from the unit, and a rectifying plate that is provided on the exhaust port side and guides the cooling air that has cooled the arc tube to the exhaust port.

  According to this configuration, since the rectifying plate is provided on the exhaust port side, the rectifying plate can be configured to be suitable for discharging cooling air. With this rectifying plate, the cooling air warmed by cooling the arc tube is guided to the exhaust port and discharged to the outside, so the introduction of the cooling air from the intake port is promoted and the arc tube can be cooled efficiently. The temperature rise in the space is suppressed. Thereby, it is possible to provide a light source device in which breakage and deterioration of the arc tube are suppressed.

  Application Example 2 In the light source device according to the application example described above, the intake port and the exhaust port are disposed to face each other with the arc tube interposed therebetween, and are introduced from the intake port. It is preferable that the cooling air flows along the reflection surface, and the rectifying plate is disposed on the emission side of the light flux from the exhaust port so as to intersect the cooling air flow. .

  According to this configuration, the cooling air introduced from the intake port side flows along the reflecting surface of the reflector and travels toward the light emission side, but is blocked by the rectifying plate and guided to the exhaust port. As a result, the cooling air is easily discharged from the exhaust port, so that the cooling air can be exhausted efficiently.

  Application Example 3 A light source device according to the application example described above, which is provided along the inner surface of the holding member and shields light irradiated on the inner surface of the luminous flux emitted from the arc tube. The rectifying plate is preferably formed integrally with the light shielding member.

  According to this configuration, when the holding member is made of resin, the holding member deteriorates when irradiated with light including ultraviolet rays emitted from the arc tube, but the holding member has the light shielding member on the inner surface of the holding member. Degradation can be suppressed. Since the light shielding member and the rectifying plate are integrally formed, a member and a space for fixing the rectifying plate can be eliminated. Thereby, compared with the case where the current plate is a component different from the light shielding member, an increase in the number of parts and an increase in the number of manufacturing steps can be suppressed, and an increase in size and complexity of the light source device can be avoided.

  Application Example 4 In the light source device according to the application example, the light shielding member is made of metal and has an opening corresponding to the exhaust port, and the area of the rectifying plate is the area of the opening The following is preferable.

  According to this configuration, since the rectifying plate is made of metal, the thickness of the rectifying plate can be made thinner than when the rectifying plate is made of resin or the like. For this reason, the disturbance of the flow of the cooling air at the end of the current plate can be suppressed. Further, since the area of the current plate is equal to or smaller than the area of the opening, when the light shielding member is formed, a portion of the material that is opened as the opening can be used as the current plate.

  Application Example 5 In the light source device according to the application example described above, it is preferable that the rectifying plate is disposed outside an effective optical path of the light beam emitted from the arc tube.

  According to this configuration, since the rectifying plate is disposed outside the effective optical path of the light emitted to the illuminated region side of the illumination light flux, the rectifying plate blocks light emitted from the light source device to the illuminated region side. Can be avoided.

  Application Example 6 A projector according to this application example includes the light source device described above, an electro-optic modulation device that modulates a light beam emitted from the light source device according to image information, and the electro-optic modulation device. And a projection lens that projects the modulated light.

  According to this configuration, it is possible to provide a projector including a light source device in which breakage or deterioration of the arc tube is suppressed.

1 is a diagram illustrating a schematic configuration of a projector according to a first embodiment. The figure which shows schematic structure of the light source device which concerns on 1st Embodiment. The figure which shows schematic structure of the light source device which concerns on 1st Embodiment. The figure which shows the flow of the cooling air in the light source device which concerns on 1st Embodiment. The figure explaining the comparative example with respect to the light source device of this invention. The figure which shows schematic structure of the light source device which concerns on 2nd Embodiment.

  The present embodiment will be described below with reference to the drawings. In each of the drawings to be referred to, the dimensional ratios, angles, and the like of the respective constituent elements are appropriately changed for easy understanding of the configuration.

(First embodiment)
<Projector>
First, the projector according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating a schematic configuration of a projector according to the first embodiment.

  As shown in FIG. 1, the projector 1000 according to the first embodiment includes an illumination device 100, a color separation light guide optical system 200, three field lenses 300 </ b> R, 300 </ b> G, and 300 </ b> B, and 3 as an electro-optic modulation device. Two liquid crystal devices 400R, 400G, and 400B, a cross dichroic prism 500, a projection lens 600, and a cooling fan 700 are provided. The projector 1000 is a projector capable of projecting an image in both a stationary posture and a ceiling-suspended posture inverted from the stationary posture.

  The illumination device 100 includes a light source device 10, a concave lens 90, a first lens array 120 having a plurality of first small lenses 122, a second lens array 130 having a plurality of second small lenses 132, and a polarization conversion element 140. And a superimposing lens 150.

  The light source device 10 includes an arc tube 20, a reflector 30, and a holding member 40. The reflector 30 has, for example, a reflecting surface 31 (see FIGS. 2A and 2B) that is a part of a spheroid having a first focal point and a second focal point on the illumination optical axis OC. Further, the first focal point of the reflector 30 is located in the tube portion 21 of the arc tube 20 (see FIGS. 2A and 2B). The light source device 10 emits an illumination light beam that converges toward the second focal point of the reflector 30.

  The holding member 40 includes a duct portion 44 and an intake port 46 for introducing air for cooling the arc tube 20 (hereinafter also referred to as cooling air) into the light source device 10, and exhaust for discharging the cooling air to the outside of the light source device 10. And a mouth 48. The light source device 10 is configured to be replaceable by the user when the arc tube 20 reaches the end of its life. In the light source device 10, the side opposite to the illuminated region side is the back side. The detailed configuration of the light source device 10 will be described later.

  The concave lens 90 is disposed on the illuminated area side of the light source device 10. The concave lens 90 emits the converged light from the light source device 10 toward the first lens array 120 as substantially parallel light. The first lens array 120 has a function as a light beam splitting optical element that splits the illumination light beam emitted from the concave lens 90 into a plurality of partial light beams. The first lens array 120 includes a plurality of first small lenses 122 arranged in a matrix in a plane substantially orthogonal to the illumination optical axis OC. Although not illustrated, the outer shape of the first small lens 122 is similar to the outer shape of the image forming area of the liquid crystal devices 400R, 400G, and 400B.

  The second lens array 130 is an optical element for condensing a plurality of partial light beams divided by the first lens array 120 described above. The second lens array 130 includes a plurality of second small lenses 132 arranged in a matrix in a plane substantially orthogonal to the illumination optical axis OC corresponding to the plurality of first small lenses 122 of the first lens array 120. I have.

  The polarization conversion element 140 is a polarization conversion element that converts each partial light beam from the second lens array 130 into approximately one type of linearly polarized light having a uniform polarization direction and emits the converted light. The polarization conversion element 140 transmits one linear polarization component of the polarization component included in the illumination light beam from the light source device 10 as it is, and reflects the other linear polarization component in a direction perpendicular to the illumination optical axis OC. A reflection layer that reflects the other linearly polarized light component reflected by the polarization separation layer in a direction parallel to the illumination optical axis OC, and converts the other linearly polarized light component reflected by the reflective layer into one linearly polarized light component. And a retardation plate.

  The superimposing lens 150 is an optical for superimposing a plurality of partial light beams emitted through the first lens array 120, the second lens array 130, and the polarization conversion element 140 in the vicinity of the image forming regions of the liquid crystal devices 400R, 400G, and 400B. It is an element. Note that the superimposing lens 150 is illustrated as a single lens in FIG. 1, but may be configured by a composite lens in which a plurality of lenses are combined.

  The color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, an incident side lens 260, and a relay lens 270. The color separation light guide optical system 200 separates the illumination light beam emitted from the illumination device 100 into three color lights of red light, green light, and blue light, and the respective color lights are liquid crystal devices 400R and 400G to be illuminated. , 400B.

  The dichroic mirrors 210 and 220 are optical elements on which a wavelength selection film that reflects a light beam in a predetermined wavelength region and transmits a light beam in another wavelength region is formed on a substrate. The dichroic mirror 210 disposed in the front stage of the optical path is a mirror that reflects a red light component and transmits other color light components. The dichroic mirror 220 disposed in the latter stage of the optical path is a mirror that reflects the green light component and transmits the blue light component.

  The red light component reflected by the dichroic mirror 210 is bent by the reflection mirror 230 and enters the image forming area of the liquid crystal device 400R for red light through the field lens 300R. The field lens 300R is provided to convert each partial light beam from the superimposing lens 150 into a light beam substantially parallel to each principal ray. The field lenses 300G and 300B disposed in the preceding stage of the optical path of the other liquid crystal devices 400G and 400B are configured similarly to the field lens 300R.

  Of the green light component and blue light component that have passed through the dichroic mirror 210, the green light component is reflected by the dichroic mirror 220, passes through the field lens 300G, and enters the image forming area of the green light liquid crystal device 400G. On the other hand, the blue light component is transmitted through the dichroic mirror 220, passes through the incident side lens 260, the incident side reflection mirror 240, the relay lens 270, the emission side reflection mirror 250, and the field lens 300B, and is a liquid crystal for blue light. The light enters the image forming area of the apparatus 400B. The incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 have a function of guiding the blue light component transmitted through the dichroic mirror 220 to the liquid crystal device 400B.

  The incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 are provided in the optical path of the blue light because the length of the optical path of the blue light is longer than the lengths of the optical paths of the other color lights. The reason for this is to prevent a decrease in light utilization efficiency due to light divergence and the like. The projector 1000 according to the first embodiment has such a configuration because the length of the optical path of blue light is long. However, the length of the optical path of red light is increased, and the incident side lens 260 and the relay are configured. The lens 270 and the reflection mirrors 240 and 250 may be used in the optical path of red light.

  The liquid crystal devices 400R, 400G, and 400B modulate each of the three color lights separated by the color separation light guide optical system 200 in accordance with image information, and are illumination targets of the illumination device 100. Although not shown, an incident-side polarizing plate is disposed between each field lens 300R, 300G, 300B and each liquid crystal device 400R, 400G, 400B, and each liquid crystal device 400R, 400G, 400B and a cross dichroic prism are arranged. An exit side polarizing plate is disposed between each of them.

  The incident-side polarizing plate, the liquid crystal devices 400R, 400G, and 400B, and the exit-side polarizing plate modulate the light of each incident color light. The liquid crystal devices 400R, 400G, and 400B are obtained by hermetically sealing a liquid crystal that is an electro-optical material on a pair of transparent glass substrates. The liquid crystal devices 400R, 400G, and 400B, for example, use polysilicon TFTs as switching elements to modulate the polarization direction of one type of linearly polarized light emitted from the incident-side polarizing plate according to a given image signal.

  The cross dichroic prism 500 is an optical element that forms a color image by synthesizing optical images modulated by the three liquid crystal devices 400R, 400G, and 400B and modulated for each color light emitted from the emission side polarizing plate. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on a substantially X-shaped interface in which the right-angle prisms are bonded together. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.

  The projection lens 600 enlarges and projects the color image synthesized by the cross dichroic prism 500 on a projection surface such as a screen SCR. Thereby, an image is formed on a projection surface such as a screen SCR.

  The cooling fan 700 is disposed so as to face the opening of the duct portion 44 of the holding member 40. The cooling fan 700 blows cooling air for cooling the arc tube 20 of the light source device 10. The cooling fan 700 is configured by a blower fan such as a sirocco fan, for example.

<Light source device>
Next, the light source device according to the first embodiment will be described with reference to FIGS. In the following drawings and description, the traveling direction of the light beam along the illumination optical axis OC is in the X direction, along the horizontal direction out of the directions orthogonal to the X direction, and the left direction when viewed from the front end side in the X direction is the Y direction. Further, the upward direction orthogonal to the X direction and the Y direction is defined as the Z direction. That is, the directions indicated by X, Y, and Z are orthogonal to each other.

  2 and 3 are diagrams illustrating a schematic configuration of the light source device according to the first embodiment. Specifically, FIG. 2A is a cross-sectional view of the light source device 10 viewed from the X direction when the light source device 10 is cut by a plane along the Z direction passing through the sealing portion 22a. FIG. 2B is a cross-sectional view taken along a plane along the Z direction including the illumination optical axis OC in FIG. FIG. 3A is a cross-sectional view of the light source device 10 viewed from the −Y direction when the light source device 10 is cut by a plane passing through the duct portion 44 and extending along the Z direction. FIG. 3B is a side view of the light source device 10 viewed from the Y direction side. Here, a case where the projector 1000 is used in a stationary posture will be described as an example. The arrangement of the light source device 10 in FIGS. 2 and 3 corresponds to the stationary posture of the projector 1000.

  As illustrated in FIGS. 2A and 2B, the light source device 10 according to the first embodiment includes an arc tube 20, a reflector 30, a holding member 40, and a light shielding member 50.

  The arc tube 20 includes a tube portion 21, a pair of sealing portions 22a and 22b (see FIG. 2B), a pair of electrodes (not shown), a pair of metal foils (not shown), and a pair of Lead wires (not shown). As the arc tube 20, various arc tubes that emit light with high luminance can be employed, for example, a high pressure mercury lamp, an ultra high pressure mercury lamp, a metal halide lamp, or the like. These lamps have high brightness and emit light including intense ultraviolet rays.

  The sealing portions 22a and 22b extend from the tube portion 21 to both sides along the illumination optical axis OC. The sealing portion 22 a is disposed on the illuminated area side of the tube portion 21, and the sealing portion 22 b is disposed on the back side of the tube portion 21. The tube portion 21 and the sealing portions 22a and 22b are made of, for example, quartz glass and are integrally formed. In the tube portion 21, for example, mercury, rare gas and a small amount of halogen are sealed.

  The pair of electrodes are arranged so that one end portions sealed in the tube portion 21 face each other. The electrode is made of a metal such as tungsten, for example. The pair of metal foils are sealed in the sealing portions 22a and 22b, and are electrically connected to the pair of electrodes and the pair of lead wires. The metal foil is made of a metal such as molybdenum, for example. The lead wire is made of a metal such as molybdenum or tungsten, for example. When a voltage is applied to the pair of lead wires, a potential difference is generated between the pair of electrodes, and a discharge occurs in the tube portion 21 to generate an arc image.

  The arc tube 20 generates heat by emitting light, but due to the influence of thermal convection, the temperature rise in the upper part (upper side) is larger than that in the lower part (lower side), and in particular, the temperature near the upper surface of the tube part 21 increases. easy. For this reason, if the cooling is insufficient and the temperature rises too much in the upper part of the arc tube 20, the base material of the arc tube 20 is recrystallized, resulting in white turbidity. On the other hand, if the cooling is excessive and the temperature is too low at the lower part of the arc tube 20, the halogen cycle of the base material of the electrode is not normally performed, and blackening occurs due to adhesion to the inner wall of the arc tube 20.

  When white turbidity or blackening occurs, the portion is devitrified, the amount of light emitted from the arc tube 20 is reduced, and the temperature of the arc tube 20 is increased to cause breakage or deterioration of the arc tube 20. Therefore, when cooling the arc tube 20, it is desirable to cool the upper part more efficiently than the lower part so that there is no temperature difference between the upper part and the lower part.

As shown in FIG. 2B, the reflector 30 includes a reflecting portion 32 having a reflecting surface 31 on the inner surface facing the arc tube 20 and a base 34 connected to the back side of the reflecting portion 32. Yes. The reflection part 32 and the base part 34 are formed integrally. As a material for the base material of the reflector 30, for example, crystallized glass, alumina (Al ₂ O ₃ ), or the like can be suitably used.

The reflector 32 has a shape that is approximately half of an elliptic sphere obtained by rotating the ellipsoid about the illumination optical axis OC as the rotation center axis. The reflecting portion 32 is disposed so that the bulb portion 21 is positioned in the vicinity of the first focal point with respect to the arc tube 20. The reflecting part 32 reflects the light emitted from the tube part 21 toward the second focal position on the illuminated area side on the reflecting surface 31. For example, a visible light reflecting layer made of a dielectric multilayer film of titanium oxide (TiO ₂ ) and silicon oxide (SiO ₂ ) is formed on the reflecting surface 31.

  An insertion hole is formed in the base portion 34, and the sealing portion 22b is inserted through this insertion hole. An adhesive C is filled between the base portion 34 and the sealing portion 22b, and the reflector 30 and the arc tube 20 are fixed to each other by the adhesive C. As the adhesive C, for example, a silica-based or alumina-based inorganic adhesive can be used.

  The holding member 40 is provided on the illuminated region side of the reflector 30. The holding member 40 is disposed so as to surround the outer periphery of the reflector 30 on the illuminated region side, and holds the reflector 30. A space surrounded by the reflecting surface 31 of the reflector 30 and the holding member 40 is referred to as a reflector space portion 36. The holding member 40 is integrally formed of, for example, a heat resistant synthetic resin material.

  The holding member 40 includes a fixed portion 41 serving as a base portion and a cylindrical portion 42 connected to the illuminated region side of the fixed portion 41. The fixing portion 41 is a portion that holds the outer periphery of the reflector 30. The cylindrical portion 42 is a portion that holds the concave lens 90. The cylindrical portion 42 includes a cylindrical portion that extends substantially parallel to the illumination optical axis OC and a lid-like portion that is disposed on the opposite side of the fixing portion 41 of the cylindrical portion.

  An opening 49 is provided in the lid-like portion, and the concave lens 90 is held in the opening 49. As shown in FIG. 2A, the cross section in the direction orthogonal to the illumination optical axis OC of the cylindrical portion 42 is, for example, a substantially octagon. The tube portion 42 is provided with a duct portion 44, an intake port 46, and an exhaust port 48.

  The duct portion 44 is provided on the side surface of the cylindrical portion 42 on the cooling fan 700 (see FIG. 1) side. The duct portion 44 has an opening facing the cooling fan 700. The cooling air blown from the cooling fan 700 flows through the duct portion 44 and is introduced into the reflector space portion 36 through the air inlet 46.

  The exhaust port 48 is provided on a side surface of the cylindrical portion 42 and is disposed on the opposite side of the intake port 46 with the arc tube 20 interposed therebetween. The cooling air introduced from the intake port 46 and cooling the arc tube 20 is discharged from the exhaust port 48 to the outside of the reflector space 36.

  The light shielding member 50 is provided along the inner surface of the cylindrical portion 42. The light shielding member 50 is for shielding light irradiated on the inner surface of the cylindrical portion 42 from the illumination light beam emitted from the arc tube 20. The light shielding member 50 prevents the material of the cylindrical portion 42 (holding member 40) from being deteriorated by light including ultraviolet rays emitted from the arc tube 20. The light shielding member 50 is formed by sheet metal processing or the like using, for example, a metal plate such as aluminum, magnesium, titanium, iron, copper, or an alloy containing these as a base material.

  The light shielding member 50 includes an opening 51, an opening 52, an opening 54, and a rectifying plate 56. As shown in FIG. 2B, the opening 51 is provided at a position corresponding to the opening 49. As shown in FIG. 3A, the opening 52 is provided at a position corresponding to the intake port 46. A metal mesh 53 is disposed in the opening 52 for dust prevention. As shown in FIG. 3B, the opening 54 is provided at a position corresponding to the exhaust port 48. A metal mesh 55 is disposed in the opening 54 for dust prevention.

  The current plate 56 is provided on the exhaust port 48 side. The rectifying plate 56 is for guiding the cooling air that has cooled the arc tube 20 to the exhaust port 48. The rectifying plate 56 is formed integrally with the light shielding member 50. For this reason, the member and space for fixing a baffle plate can be made unnecessary. Thereby, compared with the case where the current plate is a component different from the light shielding member, an increase in the number of parts and an increase in the number of manufacturing steps can be suppressed, and an increase in size and complexity of the light source device 10 can be avoided.

  For example, when the opening 54 is provided in the base material that forms the light shielding member 50, the rectifying plate 56 is formed by bending a portion of the base material that is opened as the opening 54 toward the inside (the reflector space 36 side). Can be formed. When the rectifying plate 56 is formed in this manner, the area of the rectifying plate 56 is equal to or less than the area of the opening 54. The rectifying plate 56 is disposed on the light emission side of the exhaust port 48 so as to intersect with the flow of the cooling air (see FIG. 4).

  Next, the flow of cooling air in the light source device 10 according to the first embodiment will be described with reference to FIG. FIG. 4 is a diagram illustrating a flow of cooling air in the light source device according to the first embodiment. Specifically, FIG. 4 is a cross-sectional view of FIG. 2A taken along a plane that includes the illumination optical axis OC and that includes the X direction and the Y direction.

  The cooling air blown from the cooling fan 700 is introduced from the opening of the duct portion 44 and flows toward the intake port 46. Since the width in the Y direction of the duct portion 44 becomes narrower as it approaches the reflector 30, the cooling air flows along the inner wall of the duct portion 44 in an oblique direction with respect to the illumination optical axis OC and passes through the intake port 46. To the reflecting surface 31 of the reflector 30. The cooling air introduced into the reflector space 36 flows along the reflecting surface 31 of the reflector 30 so as to turn to the side opposite to the air inlet 46. The tube portion 21 of the arc tube 20 is cooled by the cooling air.

  Then, the cooling air heated by cooling the arc tube 20 flows from the reflecting surface 31 toward the illuminated region side along the inner surface of the cylindrical portion 42 of the holding member 40. A rectifying plate 56 is disposed on the X direction side of the exhaust port 48 in the flow of cooling air so as to block the flow of cooling air. The cooling air is guided to the exhaust port 48 by the rectifying plate 56 and is discharged out of the reflector space 36.

  Next, with reference to FIG. 5, a difference between the present invention and a configuration that does not include a rectifying plate with respect to the flow of cooling air will be described. FIG. 5 is a diagram illustrating a comparative example for the light source device of the present invention. Specifically, FIG. 5 is a diagram illustrating a flow of cooling air in the light source device according to the comparative example, and is a cross-sectional view corresponding to FIG. 4.

  The light source device 80 according to the comparative example of the present invention includes the arc tube 20, the reflector 30, the holding member 40, and the light shielding member 58. Note that the light source device 80 has the same configuration as the light source device 10 according to the first embodiment except that it does not include a current plate. Further, the light shielding member 58 has the same configuration as the light shielding member 50 according to the first embodiment except that it does not have a current plate.

  In the light source device 80, the cooling air introduced into the reflector space 36 from the air inlet 46 and warmed by cooling the arc tube 20 is on the illuminated region side along the inner surface of the cylindrical portion 42 from the reflecting surface 31. It flows toward. Since the cylindrical part of the cylindrical part 42 extends substantially parallel to the illumination optical axis OC, the flow of the cooling air here becomes substantially parallel to the illumination optical axis OC. On the other hand, the direction in which the cooling air is discharged from the exhaust port 48 is a direction that intersects the flow of the cooling air substantially parallel to the illumination optical axis OC.

  Therefore, if the cooling air remains in this flow, it is difficult for the cooling air to be discharged from the exhaust port 48, and the flow of the cooling air flows from the cylindrical part of the cylindrical part 42 toward the opposite side of the exhaust port 48 along the inner surface of the lid-like part. Will be formed. Then, since the warmed cooling air stays in the reflector space portion 36, the internal pressure in the reflector space portion 36 rises and the introduction of the cooling air from the intake port 46 is prevented. As a result, the temperature in the reflector space 36 increases, the cooling efficiency of the arc tube 20 decreases, and the arc tube 20 is damaged or deteriorated.

  On the other hand, as shown in FIG. 4, in the light source device 10 according to the first embodiment of the present invention, the rectifying plate 56 is provided on the emission side of the light flux from the exhaust port 48, It is arranged so as to intersect the flow and extend into the reflector space 36. Therefore, the cooling air flowing substantially parallel to the illumination optical axis OC is guided by the rectifying plate 56 to the exhaust port 48 positioned on the upstream side with respect to the rectifying plate 56. Therefore, the cooling air is easily discharged from the exhaust port 48 and is difficult to flow along the inner surface of the lid portion from the tubular portion.

  Thereby, since the cooling air warmed by cooling the arc tube 20 can be efficiently discharged out of the reflector space 36, introduction of the cooling air from the intake port 46 is promoted. As a result, the temperature rise in the reflector space 36 is suppressed, and the arc tube 20 can be efficiently cooled. Further, by providing the rectifying plate 56 exclusively for exhaust on the exhaust port 48 side, the arrangement, shape, and the like of the rectifying plate 56 can be configured to be more suitable for discharging the cooling air.

  The rectifying plate 56 is disposed outside the effective optical path of the light emitted to the illuminated area side of the illumination light flux emitted from the arc tube 20. That is, the rectifying plate 56 is disposed outside the imaginary line L that indicates the outermost range of the focused light that is reflected by the reflecting surface 31 and converges toward the second focal point. Thereby, it is avoided that the rectifying plate 56 blocks the focused light emitted from the light source device 10 toward the illuminated area. The size of the current plate 56 is preferably large as long as it does not enter the effective optical path.

  The rectifying plate 56 is formed of a metal integrally with the light shielding member 50. For this reason, compared with the case where it shape | molds with a synthetic resin material etc., the thickness of the baffle plate 56 can be made thinner, and when the baffle plate 56 is thick, disturbance of the flow of the cooling air which arises in an edge part can be suppressed. . And since the member and space for fixing the baffle plate 56 are unnecessary, disturbance of the flow of the cooling air which arises when these fixing members and space exist can also be suppressed.

  As described above, according to the configuration of the light source device 10 according to the first embodiment, the following effects can be obtained.

  (1) Since the rectifying plate 56 is provided on the exhaust port 48 side, the cooling air warmed by cooling the arc tube 20 is guided to the exhaust port 48 and discharged out of the reflector space 36. For this reason, since the introduction of the cooling air from the intake port 46 is promoted, the temperature rise in the reflector space 36 is suppressed. Thereby, since the arc tube 20 can be efficiently cooled, it is possible to provide the light source device 10 in which breakage or deterioration of the arc tube 20 is suppressed, and the projector 1000 including such a light source device 10.

  (2) Since the rectifying plate 56 is disposed so as to extend crossing the flow of the cooling air on the light emission side from the exhaust port 48, the flow of the cooling air is blocked by the rectifying plate 56 and the exhaust port 48. Thereby, the cooling air can be efficiently discharged out of the reflector space 36.

  (3) Since the rectifying plate 56 is provided exclusively for exhaust, the arrangement and shape of the rectifying plate 56 can be configured to be suitable for discharging cooling air.

  (4) Since the current plate 56 is formed integrally with the light shielding member 50 and a member or space for fixing the current plate 56 can be eliminated, an increase in the number of parts and an increase in manufacturing man-hours can be suppressed, and a light source device An increase in size and complexity of 10 can be avoided. In addition, since the rectifying plate 56 can be thinned, the disturbance of the flow of the cooling air at the end of the rectifying plate 56 is suppressed.

  The light source device 10 is disposed on the illuminated region side of the tube portion 21, and a secondary mirror that reflects the light emitted from the tube portion 21 toward the tube portion 21 (the reflecting surface 31 of the reflector 30). Furthermore, you may provide.

(Second Embodiment)
<Light source device>
Next, a light source device according to a second embodiment will be described with reference to FIG. The light source device according to the second embodiment is different from the light source device according to the first embodiment in that a switching mechanism and a partition wall are provided in the duct portion, and a rectifying plate is provided separately from the light shielding member. The other configurations are almost the same.

  FIG. 6 is a diagram illustrating a schematic configuration of the light source device according to the second embodiment. Specifically, FIG. 6A is a cross-sectional view seen from the X direction when the light source device is cut along a plane along the Z direction passing through the sealing portion, and corresponds to FIG. FIG.6 (b) is sectional drawing seen from the -Y direction when a light source device is cut | disconnected by the plane which passes a duct part and follows a Z direction, and is a figure corresponding to Fig.3 (a). In addition, about the component which is common in 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 6A and 6B, the light source device 12 according to the second embodiment includes an arc tube 20, a reflector 30, a holding member 40, a light shielding member 58, a current plate 70, And a switching mechanism 60.

  In the light source device 12, a partition wall 45 substantially parallel to a plane constituted by the X direction and the Y direction is provided at a substantially center in the Z direction of the duct portion 44. The partition wall 45 partitions the inside of the duct portion 44 into an upper flow path and a lower flow path. As shown in FIG. 6B, the switching mechanism 60 is provided in the duct portion 44 and is disposed on the illuminated area side of the partition wall 45. The switching mechanism 60 includes a plate-like shutter and a hinge that pivotally supports the shutter. The hinge of the switching mechanism 60 is disposed in the approximate center of the inner wall of the duct portion 44 in the Z direction and in the vicinity of the end portion on the X direction side of the partition wall 45.

  The shutter of the switching mechanism 60 rotates in a range between a position indicated by a solid line and a position indicated by a two-dot chain line in FIG. The position indicated by a solid line is a stationary position when the projector 1000 is used in a stationary position, and the position indicated by a two-dot chain line is a stationary position when the projector 1000 is used in a ceiling position, that is, when the projector 1000 is turned upside down. It is. The shutter of the switching mechanism 60 is in gravity until the tip of the shutter comes into contact with the inner wall of the duct portion 44 when the projector 1000 is turned upside down from the stationary position to the ceiling position and vice versa. It turns downward by its own weight due to the action.

  The switching mechanism 60 opens the upper flow path partitioned by the partition wall 45 and closes the lower flow path in the duct portion 44 in both the stationary posture and the ceiling suspension posture. Therefore, the switching mechanism 60 selectively introduces and distributes the cooling air into the flow path located above the duct portion 44 in both the stationary posture and the ceiling hanging posture.

  In the light source device 12, the cooling air blown from the cooling fan 700 and introduced from the opening of the duct portion 44 circulates through the flow path located on the upper side partitioned by the partition wall 45 by the switching mechanism 60. For this reason, since the cooling air introduced from the intake port 46 flows more in the upper side than in the lower side in the reflector space 36, the arc tube 20 in both the stationary posture and the ceiling suspension posture. Can be efficiently cooled, and excessive cooling of the lower part can be suppressed. Thereby, compared with the light source device 10 which concerns on 1st Embodiment, the failure | damage and deterioration of the arc_tube | light_emitting_tube 20 can be suppressed more effectively.

  As illustrated in FIG. 6A, the light shielding member 58 includes an opening 51 (see FIG. 2B), an opening 52, and an opening 54. The rectifying plate 70 is provided separately from the light shielding member 58. The rectifying plate 70 is made of, for example, metal, and is fixed to the light shielding member 58 by welding, screwing, or the like.

  By making the current plate 70 separate from the light shielding member 58, the area of the current plate 70 is not limited by the area of the opening 54 compared to the light source device 10 according to the first embodiment. It can be made larger as long as it does not fall into the range. Thereby, the effect which controls the flow of the cooling wind by the baffle plate 70 can be heightened more.

  As described above, the light source device and the projector according to the present invention have been described based on the above embodiment, but the present invention is not limited thereto, and various modifications can be made without departing from the spirit of the present invention. . As modifications, for example, the following can be considered.

(Modification 1)
Although the light source device 10 of the first embodiment has a configuration that does not include the switching mechanism, the present invention is not limited to this configuration. Similarly to the light source device 12 according to the second embodiment, the light source device 10 may include a switching mechanism 60. When the light source device 10 includes the switching mechanism 60, the upper portion of the arc tube 20 can be efficiently cooled and excessive cooling of the lower portion can be suppressed, so that breakage and deterioration of the arc tube 20 can be more effectively suppressed. .

  When the light source device is used in a projector that is used in either a stationary posture or a ceiling suspension posture, even if the switching mechanism 60 is not provided, cooling air is introduced above the reflector space. By providing the air inlet and the duct portion as described above, a large amount of cooling air can flow above the arc tube. Thereby, the upper part of the arc tube can be efficiently cooled, and excessive cooling of the lower part can be suppressed. Even with such a configuration, the cooling air warmed by the current plate is efficiently discharged from the exhaust port to the outside of the reflector space, so that the arc tube can be efficiently cooled. Such a configuration can also be applied to a light source device in which the reflector has a shape that is approximately ¼ of an elliptical sphere, that is, a shape in which approximately ½ on the lower side of the reflector 30 of the above-described embodiment is deleted.

(Modification 2)
In the configuration of the projector of the above embodiment, the lens integrator optical system including the first lens array and the second lens array is used as the light uniformizing optical system, but the present invention is not limited to this. As the light homogenizing optical system, for example, a rod integrator optical system including a light guide rod can be used.

(Modification 3)
The projector in the above embodiment is a transmissive projector, but the present invention is not limited to this. For example, a reflective projector may be used. Here, “transmission type” means that the electro-optic modulation device is a type that transmits light, such as a transmission type liquid crystal device, and the “reflection type” means a reflection type liquid crystal device. This means that the electro-optic modulator is a type that reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(Modification 4)
The projector in the above embodiment is a projector using three liquid crystal devices, but the present invention is not limited to this. The present invention can also be applied to a projector using one, two, four or more liquid crystal devices, for example.

(Modification 5)
In the configuration of the projector of the above embodiment, a liquid crystal device is used as the electro-optic modulation device, but the present invention is not limited to this. In general, the electro-optic modulation device may be any device that modulates incident light in accordance with image information, and a micromirror light modulation device or the like may be used. For example, a DMD (digital micromirror device) (trademark of TI) can be used as the micromirror light modulator.

(Modification 6)
The present invention can be applied to a front projection type projector that projects from the side that observes the projected image and a rear projection type projector that projects from the side opposite to the side that observes the projected image.

(Modification 7)
In the said embodiment, although the example which applied the light source device of this invention to the projector was demonstrated, this invention is not limited to this. The light source device of the present invention can also be applied to other optical equipment such as an optical disk device.

  DESCRIPTION OF SYMBOLS 10, 12, 80 ... Light source device, 20 ... Light-emitting tube, 30 ... Reflector, 31 ... Reflecting surface, 40 ... Holding member, 46 ... Intake port, 48 ... Exhaust port, 50, 58 ... Light shielding member, 52, 54 ... Opening 56, 70 ... current plate, 100 ... lighting device, 400R, 400G, 400B ... liquid crystal device as electro-optic modulator, 600 ... projection lens, 1000 ... projector.

Claims (6)

An arc tube emitting a luminous flux;
A reflector having a reflecting surface to which the arc tube is fixed and reflecting the luminous flux;
A holding member for holding the reflector, and a light source device comprising:
The holding member has an intake port for introducing cooling air for cooling the arc tube into a space surrounded by the holding member and the reflecting surface;
An exhaust port for discharging the cooling air from the space;
A light source device comprising: a rectifying plate that is provided on the exhaust port side and guides the cooling air that has cooled the arc tube to the exhaust port. The light source device according to claim 1,
The intake port and the exhaust port are disposed to face each other with the arc tube interposed therebetween,
The cooling air introduced from the intake port flows along the reflection surface,
The light source device, wherein the rectifying plate is arranged on the emission side of the luminous flux from the exhaust port so as to extend so as to intersect the flow of the cooling air. The light source device according to claim 1 or 2,
A light shielding member that is provided along the inner surface of the holding member and shields light irradiated on the inner surface of the luminous flux emitted from the arc tube;
The rectifying plate is formed integrally with the light shielding member. The light source device according to claim 3,
The light shielding member is made of metal and has an opening corresponding to the exhaust port,
The light source device according to claim 1, wherein an area of the rectifying plate is equal to or less than an area of the opening. The light source device according to any one of claims 1 to 4,
The light source device, wherein the rectifying plate is disposed outside an effective optical path of the light beam emitted from the arc tube. A light source device according to any one of claims 1 to 5,
An electro-optic modulator that modulates a light beam emitted from the light source device according to image information;
And a projection lens that projects the modulated light from the electro-optic modulator.

Images