JP2010251172A - Light source device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device enabling appropriate temperature adjustment of an arc tube. <P>SOLUTION: The light source device 2 has the arc tube 11 with a light-emitting part 15 to emit light, a first sealing part 16 integrally installed on one side of the light-emitting part and a second sealing part 17 integrally installed on the other side of the light-emitting part, a sub-reflecting mirror 13 which covers part of the surrounding of the light-emitting part and reflects the light emitted from the light-emitting part, the main reflecting mirror 12 to reflect the light emitted from the light-emitting part and the light reflected by the sub-reflecting mirror, and a nozzle 14 in order to make air flow between the sub-reflecting mirror and the light-emitting part by passing through air inside. As for the nozzle, one tip 14a is arranged so as to be positioned in the vicinity of the light-emitting part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a light source device and a projector, and more particularly to a technology of a light source device having a reflector.

  In a lamp used as a light source of a projector, for example, a discharge lamp such as an extra-high pressure mercury lamp, a reflector (reflecting mirror) that reflects light emitted from an arc tube is used. In order to obtain a bright image efficiently with a projector, a configuration of a light source device for improving the utilization efficiency of light emitted from an arc tube has been proposed. For example, a technique has been proposed in which a sub-reflecting mirror that covers a part of the arc tube is provided separately from the reflector as the main reflecting mirror (see, for example, Patent Document 1). The light reflected by the sub-reflecting mirror passes through the arc tube, enters the main reflecting mirror, and is reflected toward the front side. This makes it possible to reduce the thickness of the light source device while efficiently making the light emitted from the arc tube proceed to the optical system that uses the light from the light source device.

Japanese Patent No. 3350003

  Lamps used in projectors need to be cooled by cooling air or the like because much of the supplied electric energy becomes heat and becomes high temperature. In the case of a configuration including a sub-reflecting mirror, it is difficult to cool a portion covered by the sub-reflecting mirror on the surface of the light emitting unit. In this case, since the heat radiation property is different between the portion covered by the sub-reflecting mirror and the other portion on the surface of the light emitting portion, there arises a problem that it is difficult to appropriately adjust the temperature of the arc tube. A portion of the arc tube that is not sufficiently cooled may cause the transparent member constituting the arc tube to be crystallized by heat and become cloudy. SUMMARY An advantage of some aspects of the invention is that it provides a light source device that enables appropriate temperature adjustment of an arc tube and a projector having the light source device.

  In order to solve the above-described problems and achieve the object, the light source device of the present invention includes a light emitting unit that emits light, a first sealing unit that is integrally provided on one side of the light emitting unit, and a light emitting unit. A light emitting tube including a second sealing portion integrally provided on the other side, a sub-reflector that covers a part of the periphery of the light emitting portion and reflects light emitted from the light emitting portion, and a light emitting portion A main reflecting mirror for reflecting the emitted light and the light reflected by the sub-reflecting mirror, and a nozzle for allowing air to flow between the sub-reflecting mirror and the light emitting unit through the inside. The nozzle is arranged so that one tip is located in the vicinity of the light emitting unit.

  Since one tip of the nozzle is located in the vicinity of the light emitting unit, air between the sub-reflecting mirror and the light emitting unit can be flowed by blowing or sucking air from the tip. As a result, it is possible to effectively cool the portion of the arc tube covered with the sub-reflecting mirror, and the temperature of the arc tube can be adjusted appropriately.

  Moreover, as a preferable aspect of the present invention, the nozzle is desirably disposed along the second sealing portion. Since the nozzle is disposed along the second sealing portion, the light traveling toward the irradiated surface is not easily blocked by the nozzle, and a decrease in light use efficiency can be suppressed.

  Moreover, as a preferable aspect of the present invention, it further includes an extending portion that is formed integrally with the sub-reflecting mirror and covers a part of the second sealing portion, and the nozzle is provided between the extending portion and the second sealing portion. It is desirable to be arranged in. Even if the extension part is formed in the sub-reflecting mirror, by arranging the nozzle between the second sealing part and the extension part, the sub-reflection mirror and the light emitting part are not disturbed by the extension part. Therefore, the temperature of the arc tube can be adjusted appropriately.

  Moreover, as a preferable aspect of the present invention, it is desirable that one tip side of the nozzle is substantially parallel to the central axis of the arc tube. Since one tip side of the nozzle is substantially parallel to the central axis of the arc tube, the direction of air blown from the nozzle is also parallel to the central axis. As a result, the air blown to the light emitting part is likely to spread evenly in the space between the sub-reflecting mirror and the light emitting part, and the location where the air flows between the sub reflecting mirror and the light emitting part is biased. It is possible to suppress the occurrence of poor cooling in a part of the arc tube.

  Moreover, as a preferable aspect of the present invention, it is desirable to further include a fixing portion that integrally fixes at least the second sealing portion, the main reflecting mirror, and the nozzle. By having the fixing portion, the second sealing portion, the main reflecting mirror, and the nozzle can be fixed in a single step, so that the manufacturing cost can be suppressed.

  Moreover, as a preferable aspect of the present invention, it is desirable that the nozzle is fixed to the extending portion. By fixing the nozzle to the extending portion, the sub-reflecting mirror and the nozzle can be unitized in advance, and the assembly of the light source device can be simplified. Further, by unitizing the sub-reflecting mirror and the nozzle in advance, it becomes easy to arrange the nozzle at a desired position with respect to the sub-reflecting mirror. Cooling efficiency can be improved by positioning one tip of the nozzle at a position where more efficient cooling can be expected, for example, at the boundary position between the sub-reflecting mirror and the extending portion.

  As a preferred aspect of the present invention, it is desirable that the light source device is detachable from the projector, and the other tip side of the nozzle is substantially parallel to the mounting direction of the light source device with respect to the projector. Since the other tip end side of the nozzle is substantially parallel to the direction in which the light source device is attached to and detached from the projector, simply attaching the light source device to the projector allows the other tip end of the nozzle to be connected to the projector-side air duct and to blow air. Such a configuration is possible.

  The projector of the present invention includes the light source device, a spatial light modulation device that modulates light emitted from the light source device according to an image signal, and a blower that sends air to the nozzle. By using the light source device described above, deterioration of the arc tube can be reduced by adjusting the temperature of the arc tube appropriately. As a result, a highly reliable projector can be obtained.

  Moreover, as a preferable aspect of the present invention, it includes an attitude detection unit that detects the direction of the arc tube with respect to the direction of gravity, and an air amount adjustment unit that adjusts the amount of air sent to the nozzle according to the detection result by the attitude detection unit. It is desirable. The air heated by the arc tube increases on the upper side with respect to the lower side in the direction of gravity. By adjusting the air volume of the cooling air according to the detection result by the attitude detection unit, it is possible to adjust the temperature of the arc tube appropriately regardless of the direction of the arc tube.

1 is a diagram illustrating a schematic configuration of a projector according to a first embodiment of the invention. The external appearance perspective view which shows schematic structure of a light source device. The perspective view which looked at the light source device from the rear side. Sectional drawing which cut | disconnected the light source device by XY plane. The perspective view which shows the state which removed the sub-reflection mirror from the light source device. Sectional drawing of the light source device with which the projector which concerns on the modification 1 of the present Example 1 is provided. The external appearance perspective view of the sub-reflection mirror with which the light source device which concerns on Example 2 of this invention is provided. Sectional drawing cut | disconnected by XY plane of the light source device which concerns on Example 2 of this invention.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a schematic configuration of a projector 1 according to a first embodiment of the invention. The projector 1 is a front projection type projector that projects light onto a screen (not shown) and observes an image by observing light reflected on the screen. The projector 1 includes a light source device 2, a blower tube 5, an air pump (blower unit) 6, a posture detection unit 7, and an optical engine 8. In the description of the embodiments of the present application, the X axis is an axis orthogonal to the central axis AX of the arc tube 11. The Y axis is an axis orthogonal to the central axis AX and the X axis. The Z axis is an axis parallel to the central axis AX. The direction of the arrow on the Z axis represents the direction from the light source device 2 toward the irradiated surface (not shown). The arrow direction of each axis is a positive direction, and the opposite direction is a negative direction. A positive direction side (side with the irradiated surface) along the Z axis with respect to the light source device 2 is referred to as a front side, and a negative direction side is referred to as a rear side. The positive direction side along the Y axis with respect to the light emitting unit 15 is referred to as the upper side, and the negative direction side is referred to as the lower side.

  FIG. 2 is an external perspective view illustrating a schematic configuration of the light source device 2 according to the first embodiment of the invention. The light source device 2 includes an arc tube 11, a main reflecting mirror 12, and a sub reflecting mirror 13. The light source device 2 emits light including red (R) light, green (G) light, and blue (B) light. The light source device 2 is detachably attached to the attachment portion 1 a of the projector 1. The attaching / detaching direction is parallel to the Y-axis direction, that is, the vertical direction.

  The arc tube 11 is, for example, an ultra high pressure mercury lamp. The arc tube 11 includes a light emitting portion 15 having a substantially spherical shape. Light is emitted from the light emitting unit 15 by forming an arc between the electrodes 3 and 4 (see FIG. 4) inside the light emitting unit 15. The light emitting unit 15 is integrally provided with a first sealing unit 16 and a second sealing unit 17. The first sealing portion 16 has a cylindrical shape and is provided on one side (front side) of the light emitting portion 15. The second sealing portion 17 has a cylindrical shape and is provided on the other side (rear side) of the light emitting portion 15. With the above configuration, the arc tube 11 has a shape in which the light emitting portion 15 is sandwiched between the first sealing portion 16 and the second sealing portion 17.

  The main reflecting mirror 12 reflects the light emitted from the light emitting unit 15 and advances it to the front side. The main reflecting mirror 12 has substantially the same shape as a curved surface obtained by cutting a spheroidal surface obtained by rotating an ellipse about the central axis AX along a predetermined plane. In the present embodiment, the predetermined plane is a plane including the central axis AX of the arc tube AX. The predetermined plane may be a plane other than the plane including the central axis AX in order to increase the light use efficiency. The predetermined plane may be, for example, a plane parallel to the center axis AX or a plane having an angle with respect to the center axis AX.

  The main reflecting mirror 12 is configured by vapor-depositing a highly reflective member such as a dielectric multilayer film or a metal member on the surface of a base material formed into a desired shape. As the highly reflective member, a member having a high reflectance with respect to light having a wavelength in the visible region is used. By using the main reflecting mirror 12 having a shape obtained by cutting the spheroid, the light source device 2 can be made thinner than a light source device using a reflecting mirror whose spheroid is not cut. The main reflecting mirror 12 is not limited to the same shape as the curved surface obtained by cutting the spheroid. For example, the shape may be substantially the same as a curved surface obtained by cutting a rotating curved surface obtained by rotating a predetermined curve such as a parabola, or a free curved surface shape.

  The sub-reflecting mirror 13 reflects the light emitted from the light emitting unit 15 toward the light emitting unit 15. The sub-reflecting mirror 13 covers a part of the periphery of the light emitting unit 15 from below. A gap is provided between the sub-reflecting mirror 13 and the light emitting unit 15. The sub-reflecting mirror 13 is configured by vapor-depositing a highly reflective member such as a dielectric multilayer film or a metal member on the surface of a base material formed into a desired shape. As the highly reflective member, a member having a high reflectance with respect to light having a wavelength in the visible region is used. By providing the main reflecting mirror 12 and the sub-reflecting mirror 13, the light emitted from the light emitting unit 15 can be efficiently advanced to the optical engine 8.

  FIG. 3 is a perspective view of the light source device 2 viewed from the rear side. FIG. 4 is a diagram showing a relationship between the light source device 2 and the air pump, and is a diagram showing a cross-sectional view of the light source device 2 cut along an XY plane. An extending portion 23 that covers a part of the second sealing portion 17 is integrally formed on the rear side of the sub-reflecting mirror 13. The extension part 23 is bonded to a fixing part 27 described later, whereby the sub-reflecting mirror 13 in the light source device 2 is positioned and fixed.

  A nozzle 14 is arranged along the second sealing portion 17 between the second sealing portion 17 and the extending portion 23. The nozzle 14 has a cylindrical shape through which air can pass. One end of the nozzle 14 is an air outlet 14a that blows out air. The nozzle 14 is disposed so that the air outlet 14 a is positioned in the vicinity of the light emitting unit 15. Further, the outlet 14 a side of the nozzle 14 is parallel to the central axis AX. Air is fed into the nozzle 4 from an air pump 6 which will be described later, and air is blown out from the air outlet 14a. In the first embodiment, the nozzle 14 is parallel to the central axis AX in a region located between the second sealing portion 17 and the extending portion 23.

  Here, since the nozzle 14 is disposed along the second sealing portion 17, it is difficult for the light toward the irradiated surface to be blocked by the nozzle 14, and a decrease in light use efficiency can be suppressed. In addition, although the extending portion 23 is formed in the sub-reflecting mirror 13, the sub-reflecting mirror is not obstructed by the extending portion 23 by disposing the nozzle 14 between the second sealing portion 17 and the extending portion 23. The air between 13 and the light emission part 15 can be made to flow.

  Moreover, since the blower outlet 14a is located in the vicinity of the light emission part 15, the air between the subreflective mirror 13 and the light emission part 15 can be flowed by blowing air from the blower outlet 14a. As a result, it is possible to effectively cool the portion of the arc tube 11 covered by the sub-reflecting mirror 13 and to adjust the temperature of the arc tube 11 appropriately. Further, since the nozzle 14 is parallel to the central axis AX, the direction of air blown from the nozzle 14 is also parallel to the central axis AX. As a result, the air blown to the light emitting unit 15 easily spreads uniformly in the space between the sub-reflecting mirror 13 and the light emitting unit 15, and it is possible to suppress the occurrence of bias in the place where the air flows. The occurrence of poor cooling in a part can be suppressed.

  The other end of the nozzle 14 is a connection port 14b for sending air into the air outlet 14a. The nozzle 14 can be connected to the blower pipe 5 through the connection port 14b. The nozzle 14 is bent at the rear side of the extending portion 23 so that the connection port 14b side is parallel to the Y-axis direction.

  FIG. 5 is a perspective view showing a state in which the sub-reflecting mirror 13 is removed from the light source device 2. The main reflecting mirror 12, the arc tube 11, and the nozzle 14 are integrally fixed beforehand by a fixing portion 27. For example, the fixing portion 27 is configured by solidifying cement. By providing the fixing portion 27, the main reflecting mirror 12, the arc tube 11, and the nozzle 14 can be fixed in a single process, so that the manufacturing cost can be reduced. The light source device 2 is configured by adhering the extending portion 23 of the sub-reflecting mirror 13 from the lower side to the fixing portion 27 in a state where the main reflecting mirror 12 and the like are integrally fixed in advance by the fixing portion 27.

  Returning to FIG. 1 and FIG. 4, the blower pipe 5, the air pump 6, and the posture detection unit 7 will be described. The blower pipe 5 is disposed in the projector 1 so that air can pass therethrough. The blower pipe 5 is connected to the air pump 6 and guides the air sent by the air pump 6. The blower tube 5 is connected to the connection port 14b of the nozzle 14 in a state where the light source device 2 is attached to the attachment portion 1a. Specifically, the connection port 14 b of the nozzle 14 is fitted inside the blower pipe 5. The front end side of the blower tube 5 is parallel to the Y-axis direction, and the connection direction of the nozzles 14 is the same vertical direction as the attachment / detachment direction of the light source device 2. The blower tube 5 is disposed at a position where the connection port 14b is fitted when the light source device 2 is attached to the attachment portion 1a. Thereby, since the nozzle 14 and the air duct 5 are connected only by attaching the light source device 2 to the attachment part 1a, the replacement | exchange operation | work of the light source device 2 can be simplified, and maintainability can be improved. . Moreover, since the connection direction of the nozzle 4 and the attachment / detachment direction of the light source device 2 are the same direction, the nozzle 14 is unlikely to become an obstacle when the light source device 2 is attached. Problems such as breakage of the nozzle 14 when the light source device 2 is attached can be made difficult to occur. An elastic body made of rubber or the like may be provided inside the blower pipe 5 to prevent air leakage from the gap between the nozzle 14 and the blower pipe 5.

  The air pump 6 is connected to the blower pipe 5 and sends air into the blower pipe 5. The air sent into the blower pipe 5 is blown out from the blowout port 14 a through the nozzle 14. The air blown from the blower outlet 14a is blown to the light emitting unit 15 and passes between the light emitting unit 15 and the sub-reflecting mirror 13 to cause the air to flow. Thereby, even the part covered with the sub-reflecting mirror 13 in the arc tube 11 can be sufficiently cooled.

  The attitude detection unit 7 detects the direction of the arc tube 11 with respect to the direction of gravity. The air volume adjusting unit 9 adjusts the amount of air sent from the air pump 1 according to the detection result by the posture detecting unit 7. For example, a case where the posture detection unit 7 detects that the side of the light emitting unit 15 covered with the sub-reflecting mirror 13 is the lower side in the gravitational direction is the first posture. Further, a case where the posture detection unit 7 detects that the side of the light emitting unit 15 covered with the sub-reflecting mirror 13 is the upper side in the gravity direction is defined as a second posture.

  Here, it is assumed that the posture detection unit 7 detects the second posture. In this case, on the side of the light emitting unit 15 covered with the sub-reflecting mirror 13, the heated air is more likely to be trapped than when it is in the first posture. Therefore, the air volume adjusting unit 9 performs adjustment to increase the amount of air fed from the air pump 6 as compared with the first posture. Further, it is assumed that the posture detection unit 7 detects the first posture. In this case, the air volume adjusting unit 9 performs adjustment to increase the amount of air fed from the air pump 6 as compared with the second posture.

  Thus, by adjusting the air volume of the cooling air according to the detection result by the posture detection unit 7, there is an effect that it is possible to appropriately adjust the temperature of the arc tube 11 regardless of the direction of the arc tube 11. The light source device 2 according to the present embodiment is particularly suitable for a case where the light source device 2 is installed in a projector that can take either an upright state installed on a desk or a table or an inverted state installed on a ceiling. Yes.

  Next, the optical engine 8 will be described. The concave lens 31 collimates the light emitted from the light source device 2. The first integrator lens 32 and the second integrator lens 33 have a plurality of lens elements arranged in an array. The first integrator lens 32 divides the light flux from the concave lens 31 into a plurality of parts. Each lens element of the first integrator lens 32 condenses the light beam from the concave lens 31 in the vicinity of the lens element of the second integrator lens 33. The lens element of the second integrator lens 33 forms an image of the lens element of the first integrator lens 32 on the spatial light modulator.

  The light that has passed through the two integrator lenses 32 and 33 is converted into linearly polarized light in a specific vibration direction by the polarization conversion element 34. The superimposing lens 35 superimposes the image of each lens element of the first integrator lens 32 on the spatial light modulator. The first integrator lens 32, the second integrator lens 33, and the superimposing lens 35 make the light intensity distribution from the light source device 2 uniform on the spatial light modulator. Light from the superimposing lens 35 enters the first dichroic mirror 36. The first dichroic mirror 36 reflects R light and transmits G light and B light. The R light incident on the first dichroic mirror 36 has its optical path bent by the first dichroic mirror 36 and the reflection mirror 37, and is incident on the R light field lens 38R. The R light field lens 38R collimates the R light from the reflection mirror 37 and makes it incident on the R light spatial light modulator 39R.

  The spatial light modulator 39R for R light is a spatial light modulator that modulates R light according to an image signal, and is a transmissive liquid crystal display device. A liquid crystal panel (not shown) provided in the R light spatial light modulator 39R encloses a liquid crystal layer for modulating light according to an image signal between two transparent substrates. The R light modulated by the R light spatial light modulator 39R is incident on the cross dichroic prism 40 which is a color synthesis optical system.

  The G light and B light that have passed through the first dichroic mirror 36 enter the second dichroic mirror 41. The second dichroic mirror 41 reflects G light and transmits B light. The G light incident on the second dichroic mirror 41 has its optical path bent by the second dichroic mirror 41 and is incident on the G light field lens 38G. The G light field lens 38G collimates the G light from the second dichroic mirror 41 and makes it incident on the G light spatial light modulator 39G. The G light spatial light modulation device 39G is a spatial light modulation device that modulates G light according to an image signal, and is a transmissive liquid crystal display device. The G light modulated by the G light spatial light modulator 39G is incident on a different surface of the cross dichroic prism 40 from the surface on which the R light is incident.

  The B light transmitted through the second dichroic mirror 41 is transmitted through the relay lens 42, and then the optical path is bent by reflection at the reflection mirror 43. The B light from the reflection mirror 43 further passes through the relay lens 44, and then the optical path is bent by reflection by the reflection mirror 45, and enters the B light field lens 38B. Since the optical path of the B light is longer than the optical path of the R light and the optical path of the G light, relay lenses 42 and 44 are provided in the optical path of the B light in order to make the illumination magnification in the spatial light modulation device equal to that of other color lights. The relay optical system to be used is adopted.

  The B light field lens 38B collimates the B light from the reflection mirror 45 and makes it incident on the B light spatial light modulator 39B. The B light spatial light modulation device 39B is a spatial light modulation device that modulates B light according to an image signal, and is a transmissive liquid crystal display device. The B light modulated by the B light spatial light modulator 39B is incident on a surface of the cross dichroic prism 40 different from the surface on which the R light is incident and the surface on which the G light is incident.

  The cross dichroic prism 40 has two dichroic films 46 and 47 that are substantially orthogonal to each other. The first dichroic film 46 reflects R light and transmits G light and B light. The second dichroic film 47 reflects B light and transmits R light and G light. The cross dichroic prism 40 combines R light, G light, and B light incident from different directions, and emits the light toward the projection lens 48. The projection lens 48 projects the light combined by the cross dichroic prism 40 toward the screen.

  By using the light source device 2 described above, the projector 1 can sufficiently cool the arc tube 11 and can reduce deterioration of the arc tube 11. Thereby, there is an effect that a highly reliable projector 1 can be obtained. Further, when the projector 1 is used in an inverted state, the sub-reflecting mirror 13 covers the upper side of the light emitting unit 15, and the temperature of the arc tube 11 tends to increase. Since the projector 1 adjusts the amount of air sent from the air pump 6 according to the posture, the arc tube 11 can be sufficiently cooled by increasing the amount of air even when the projector 1 is used in an inverted state. . That is, it is possible to obtain a projector that enables appropriate temperature control of the arc tube 11 according to the state of use.

  The projector 1 is not limited to the case where a transmissive liquid crystal display device is used as the spatial light modulation device. As the spatial light modulator, a reflective liquid crystal display (Liquid Crystal On Silicon; LCOS), DMD (Digital Micromirror Device), GLV (Grating Light Valve), or the like may be used. The projector 1 is not limited to a configuration including a spatial light modulator for each color light. The projector 1 may be configured to modulate two or three or more color lights with one spatial light modulator. The projector 1 is not limited to using a spatial light modulation device. The projector 1 may be a slide projector that uses a slide having image information. The projector 1 may be a so-called rear projector that supplies light to one surface of the screen and observes an image by observing light emitted from the other surface of the screen.

  Moreover, you may comprise so that air may be sucked in from the nozzle 14 by making the direction into which the air pump 6 sends air into a reverse direction. Also in this case, the light in the vicinity of the light emitting unit 15 can be flowed to sufficiently cool the light emitting unit 15. Further, the amount of cooling of the arc tube 11 can be controlled by adjusting the amount of air sucked.

  FIG. 6 is a cross-sectional view of the light source device included in the projector according to the first modification of the first embodiment. In the first modification, the connection port 14b side of the nozzle 14 is parallel to the Z-axis direction. Moreover, the front end side of the blower pipe 5 is also parallel to the Z-axis direction. Thereby, even if it is the projector 1 in which the attachment or detachment direction of the light source device 2 is the front-back direction, by using the light source device 2 of this modification 1, the nozzle 14 does not become obstructive at the time of attachment of the light source device 2, and the light source device It is possible to make it difficult to cause problems such as the nozzle 14 being broken at the time of mounting 2. Moreover, since the nozzle 14 and the air pipe 5 are connected only by attaching the light source device 2, the replacement | exchange operation | work of the light source device 2 can be simplified, and maintainability can be improved.

  FIG. 7 is an external perspective view of a sub-reflecting mirror included in the light source device according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. In the second embodiment, the nozzle 14 is fixed to the extending portion 23 of the sub-reflecting mirror 13 in advance. Similarly to the fixing portion 27 described above, the nozzle 14 is fixed to the extending portion 23 using cement. Note that an adhesive may be used for fixing the nozzle 14, and for example, a ceramic adhesive may be used.

  By fixing the nozzle to the extending portion 23, the sub-reflecting mirror 13 and the nozzle 14 can be unitized in advance, and the assembly of the light source device 2 can be simplified. Further, by previously unitizing the sub-reflecting mirror 13 and the nozzle 14, the nozzle 14 with respect to the sub-reflecting mirror 13 can be easily arranged at a desired position. Cooling efficiency can be improved by positioning the air outlet 14a at a position where more efficient cooling can be expected, for example, at a boundary position between the sub-reflecting mirror 13 and the extending portion 23.

  FIG. 8: is sectional drawing cut | disconnected by the XY plane of the light source device which concerns on Example 2 of this invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted. In Example 3, no extending portion is formed on the sub-reflecting mirror 13. A fixing portion 28 is formed on the sub-reflecting mirror 13 on the side opposite to the arc tube 11 side. The sub-reflecting mirror 13 is positioned and fixed in the light source device by fixing the fixing portion 28 to a housing or the like (not shown).

  The nozzle 14 is disposed along the second sealing portion 17 of the arc tube 11. In addition, the air outlet 14 a is disposed in the vicinity of the light emitting unit 15. Thus, even if it is a case where the sub-reflector 13 in which the extending | stretching part 23 is not formed is used by arrange | positioning so that the blower outlet 14a may be located in the vicinity of the light-emitting part 15, the light-emitting part 15 and the sub-reflector 13 The arc tube 11 can be sufficiently cooled by causing the air between the two to flow.

  As described above, the light source device according to the present invention is suitable for use in a projector.

DESCRIPTION OF SYMBOLS 1 Projector, 2 Light source device, 3 and 4 electrode, 5 Air pipe, 6 Air pump (blower part), 7 Attitude detection part, 8 Optical engine, 9 Air volume adjustment part, 11 Light emission tube, 12 Main reflector, 13 Sub reflector , 14 nozzle, 14a outlet, 14b connection port, 15 light emitting part, 23 extending part, 27 fixing part, 28 fixing part, 31 concave lens, 32 first integrator lens, 33 second integrator lens, 34 polarization conversion element, 35 superposition Lens, 36 First dichroic mirror, 37 Reflecting mirror, 38R R light field lens, 38G G light field lens, 38BB light field lens, 39R R light spatial light modulation device, 39G G light spatial light modulation device , 39B spatial light modulator for B light, 40 cross dichroic prism, 41 second Lee black dichroic mirrors, 42 and 44 a relay lens, 43 and 45 a reflecting mirror, 46 a first dichroic film, 47 second dichroic film, 48 a projection lens

Claims (9)

An arc tube comprising: a light emitting unit that emits light; a first sealing unit provided integrally on one side of the light emitting unit; and a second sealing unit provided integrally on the other side of the light emitting unit. When,
A sub-reflector that covers a part of the periphery of the light emitting unit and reflects light emitted from the light emitting unit;
A main reflecting mirror that reflects the light emitted from the light emitting unit and the light reflected by the sub-reflecting mirror;
A nozzle for allowing air to flow between the sub-reflecting mirror and the light emitting unit by allowing air to pass inside,
The nozzle is arranged such that one tip is positioned in the vicinity of the light emitting unit.   The light source device according to claim 1, wherein the nozzle is disposed along the second sealing portion. An extension part formed integrally with the sub-reflecting mirror and covering a part of the second sealing part;
The light source device according to claim 2, wherein the nozzle is disposed between the extending portion and the second sealing portion.   The light source device according to any one of claims 1 to 3, wherein one tip side of the nozzle is substantially parallel to a central axis of the arc tube.   5. The light source device according to claim 1, further comprising a fixing portion that integrally fixes at least the second sealing portion, the main reflecting mirror, and the nozzle.   The light source device according to claim 1, wherein the nozzle is fixed to the extending portion. The light source device is detachable from the projector,
The light source device according to claim 1, wherein the other tip side of the nozzle is substantially parallel to a direction in which the light source device is attached to and detached from the projector. A light source device according to any one of claims 1 to 7,
A spatial light modulator that modulates light emitted from the light source device according to an image signal;
A projector having an air blowing section for sending air to the nozzle. A posture detection unit for detecting the direction of the arc tube with respect to the direction of gravity;
The projector according to claim 8, further comprising: an air amount adjusting unit that adjusts an amount of air sent to the nozzle according to a detection result by the posture detecting unit.

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