JP2011203515A - Light source device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device which has prolonged life by suppressing a temperature difference between an upper part and a lower part of a light emitting tube both in posture in which a projector is installed on a desk or the like and in posture in which the projector is suspended from the ceiling, and to provide a projector.SOLUTION: The light source device 10 includes the light emitting tube 20, a reflector 30 and a holding member 40 holding the reflector 30. The holding member 40 includes: an air intake 41 introducing cooling air for cooling the light emitting tube 20; channels 42a and 42b provided to be branched to an upper side and a lower side of the light emitting tube 20 from the air intake 41 and allowing the cooling air to circulate; a switching mechanism 50 provided at a branching part between the air intake 41 and the channels 42a and 42b, and allowing the cooling air to selectively flow into the channel located on the upper side of the light emitting tube 20 out of the channels 42a and 42b; and opening/closing mechanisms 53a and 53b arranged downstream from the switching mechanism 50 and closing the channel located on the lower side of the light emitting tube 20 out of the channels 42a and 42b.

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. In the arc tube, due to the influence of thermal convection and the like, the temperature rise in the upper part (the upper side with respect to gravity) is larger than the lower part (the lower side with respect to gravity), and a temperature difference tends to occur between the upper part and the lower part. Therefore, if the cooling is insufficient and the temperature rises too much in the upper part of the arc tube, the base material of the arc tube 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, the halogen cycle of the substrate of the electrode is not performed normally, and blackening occurs due to adhesion to the inner wall of the arc tube. When white turbidity or blackening occurs, the portion is devitrified, the amount of light emitted from the arc tube is reduced, and the temperature of the arc tube is increased to cause breakage or deterioration of the arc tube. Therefore, when cooling the arc tube, 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.

  By the way, the projector is used in two postures, that is, a stationary posture that is used while being placed on a desk or the like, and a ceiling-suspended posture that is suspended from the ceiling or the like while being inverted upside down from the stationary posture. There is something. In such a projector, a downward air flow from the upper side to the lower side of the arc tube is formed so that the upper part of the arc tube is efficiently used when the projector is used in a stationary position or when it is used in a ceiling position. The structure which makes it cool by this is proposed (for example, refer patent document 1).

  In the projector described in Patent Document 1, the upper and lower sides of the arc tube in the holding member (light source lamp housing) are provided by an opening / closing device having a shutter that is pivotally supported at one end and opened / closed by upside down operation. The first flow path and the second flow path provided in are selectively opened and closed. In the flow path that is turned upside down and is on the lower side, the shutter is rotated by its own weight due to the gravity action associated with the upside down operation, and the flow path is closed. As a result, in both the standing position and the ceiling position, the upper flow path of the arc tube is opened and the lower flow path is closed, so that a descending airflow for cooling the arc tube is formed in the reflector. Is done.

Japanese Patent No. 4281429

  However, in order to make the shutter freely rotatable in the flow path, a certain gap is required between the inner wall of the flow path and the shutter. If the cooling air leaks and flows into the lower flow path where the shutter is closed from such a gap, the amount of cooling air introduced into the upper flow path is reduced accordingly. For this reason, the cooling air flowing into the flow path on the lower side flows and cooling of the lower part of the arc tube becomes excessive. On the other hand, the cooling of the upper part of the arc tube is insufficient, resulting in a temperature difference between the upper and lower parts of the arc tube. There has been a problem that the arc tube may be 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 a light emitting tube that emits a light beam, a reflector that fixes the light emitting tube and reflects the light beam, and a holding member that holds the reflector. The holding member is provided with an intake port for introducing cooling air for cooling the arc tube, and branched from the intake port to an upper side and a lower side of the arc tube, Provided at a branch portion between a pair of flow paths capable of circulating wind and the intake port and the pair of flow paths, and selective to the flow path located above the arc tube among the pair of flow paths A switching mechanism that allows the cooling air to flow into the switching mechanism, and an opening / closing mechanism that is provided on the downstream side of the cooling air with respect to the switching mechanism and that closes the flow path located below the arc tube of the pair of flow paths And.

  According to this configuration, since the cooling air selectively flows into the channel located above the arc tube of the pair of channels by the switching mechanism, the cooling air descends from the upper side to the lower side of the arc tube. An air flow is formed. In addition, since the flow path located below the arc tube is closed by the opening / closing mechanism provided downstream of the cooling air with respect to the switching mechanism, the cooling air leaks from the gap of the switching mechanism and flows below. Even when flowing into the passage, the circulation of the cooling air in the passage is suppressed. For this reason, since the upper part of the arc tube is efficiently cooled and excessive cooling of the lower part is suppressed, a temperature difference between the upper part and the lower part of the arc tube is less likely to occur. 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, the opening / closing mechanism includes a shutter having one end pivotally supported on the inner wall of the flow path, and the distance between the one end and the other end of the shutter is The inner diameter in the direction orthogonal to the extending direction of the flow path is preferably larger.

  According to this configuration, the distance between one end and the other end of the shutter is larger than the inner diameter in the direction orthogonal to the extending direction of the flow path. For this reason, when the flow path is closed by the opening / closing mechanism, the other end of the shutter is brought into contact with the inner wall of the flow path before the shutter rotates in the flow path and becomes in a positional relationship perpendicular to the extending direction of the flow path. The channel is closed by contact. Thereby, even when the cooling air leaks from the gap of the switching mechanism and flows into the channel located below, the circulation of the cooling air in the channel can be more reliably suppressed. Moreover, when opening the closed flow path, the shutter can be rotated to a predetermined side regardless of the upside down direction.

  Application Example 3 In the light source device according to the application example, it is preferable that the opening / closing mechanism is formed integrally with the switching mechanism.

  According to this configuration, since the opening / closing mechanism is formed integrally with the switching mechanism, the mechanism for forming the downdraft of the cooling air can be realized with a simpler configuration.

  Application Example 4 In the light source device according to the application example described above, each of the flow paths is provided with a recessed portion that is recessed in a direction substantially orthogonal to the extending direction of the flow path, and the opening / closing mechanism is It is preferable that the recess is housed in the state where the path is opened.

  According to this configuration, since the opening / closing mechanism is housed in the recess provided in the channel in a state where the channel is opened, the opening / closing mechanism narrows the channel and prevents the flow of the circulating cooling air from flowing. Is suppressed.

  Application Example 5 A projector according to this application example projects the light source device described above, an electro-optic modulation device that modulates a light beam emitted from the light source device, and modulated light from the electro-optic modulation device. And a projection lens.

  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 the flow of the cooling air in 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 which shows schematic structure of the light source device which concerns on 2nd Embodiment, and the flow of cooling air. The figure which shows schematic structure of the light source device which concerns on 3rd Embodiment. The figure which shows schematic structure of the light source device which concerns on the modification 1. As shown in FIG.

  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. The projector includes two liquid crystal devices 400R, 400G, and 400B, a cross dichroic prism 500, a projection lens 600, and a cooling fan 700.

  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 and a reflector 30. 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 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 air inlet 41 (see FIG. 2A) of the light source device 10. The cooling fan 700 blows air (hereinafter also referred to as cooling air) for cooling the arc tube 20 of the light source device 10. The cooling fan 700 is composed of, for example, a sirocco fan.

  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.

<Light source device>
Next, the light source device according to the first embodiment will be described with reference to FIG. FIG. 2 is a diagram 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 as seen from the illuminated region side when the light source device 10 is cut along a plane perpendicular to the illumination optical axis OC and passing through the sealing portion 22a. FIG. 2B is a cross-sectional view taken along a plane that includes the illumination optical axis OC and extends in the direction of gravity in FIG.

  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. 2A and 2B corresponds to the stationary posture of the projector 1000, and the direction of gravity is a direction from the upper side to the lower side of the drawing.

  As shown 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, a switching mechanism 50, and a pair of opening / closing mechanisms 53a. , 53b.

  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.

  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 when it emits light. However, due to the influence of thermal convection, the temperature rise at the upper part is larger than that at the lower part, and in particular, the temperature near the upper surface of the tube part 21 tends to rise. Therefore, when the arc tube 20 is cooled, it is desirable to cool it from the upper side of the bulb portion 21 so that there is no temperature difference between the upper portion and the lower portion.

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. Further, the reflector 30 has a reflector space portion 36 surrounded by a reflecting surface 31. 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. The reflector 30 may have a reflecting surface 31 having a parabolic cross section.

  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. The holding member 40 is integrally formed of, for example, a heat resistant synthetic resin material. The holding member 40 is provided with an opening at the center on the side facing the reflecting surface 31, and the concave lens 90 is held in the opening.

  As shown in FIG. 2A, the holding member 40 has an intake port 41 for introducing cooling air blown from a cooling fan 700 (see FIG. 1) and a pair of flow paths 42a through which the cooling air can flow. , 42b, a pair of openings 43a, 43b for introducing cooling air from the flow paths 42a, 42b to the reflector space 36, and an exhaust port 44 for discharging the cooling air that has cooled the arc tube 20 from the reflector space 36. Is provided. Hereinafter, the upstream side of the flow of cooling air from the intake port 41 to the exhaust port 44 is simply referred to as the upstream side, and the downstream side of the flow of cooling air is simply referred to as the downstream side.

  The intake port 41 is provided on the side of the reflector 30 so as to face the cooling fan 700. For example, the intake port 41 is disposed at substantially the same height as the arc tube 20. The flow paths 42a and 42b are branched from the air inlet 41 to the upper side and the lower side of the arc tube 20. The flow paths 42a and 42b are provided in a substantially L shape when viewed from the illuminated area side.

  In the stationary posture, the flow path 42 a extends upward from the branch portion with the air inlet 41 to the side of the reflector 30 and to the upper position of the arc tube 20 along the horizontal direction above the reflector 30. Existing part. The flow path 42b includes a portion that extends downward from the branch portion with the air inlet 41 to the side of the reflector 30, and a portion that extends below the reflector 30 to a position below the arc tube 20 along the horizontal direction. Have.

  The opening 43 a is disposed at the downstream end of the flow path 42 a and is located above the arc tube 20. The opening 43b is disposed at the downstream end of the flow path 42b and is positioned below the arc tube 20. The exhaust port 44 is provided on the side of the reflector 30, and is disposed on the opposite side of the intake port 41 with the arc tube 20 in between.

  The switching mechanism 50 is provided at a branching portion that branches from the intake port 41 to the flow paths 42a and 42b, that is, at the upstream end of each of the flow paths 42a and 42b. The switching mechanism 50 includes a plate-like shutter 51 and a hinge 52 that pivotally supports the shutter 51. The hinge 52 is disposed on the inner wall on the reflector 30 side at the branching portion to the flow paths 42a and 42b.

  The opening / closing mechanisms 53 a and 53 b are provided on the downstream side of the switching mechanism 50. The opening / closing mechanism 53a is disposed in a portion of the flow path 42a located above the reflector 30. The opening / closing mechanism 53b is disposed in a portion of the flow path 42b located below the reflector 30. The opening / closing mechanism 53a includes a plate-shaped shutter 54a and a hinge 55a, and the opening / closing mechanism 53b includes a plate-shaped shutter 54b and a hinge 55b.

  The hinges 55a and 55b are respectively disposed on the inner walls of the flow paths 42a and 42b on the reflector 30 side. The shutters 54a and 54b are pivotally supported by hinges 55a and 55b, respectively. The length of the shutters 54a and 54b (distance between one end and the other end pivotally supported by the hinges 55a and 55b) is set larger than the inner diameter in the direction orthogonal to the extending direction of the flow paths 42a and 42b.

  In a state where the plate-like surfaces of the shutters 54a and 54b are in contact with the inner walls of the flow paths 42a and 42b on the side where the hinges 55a and 55b are provided, the flow paths 42a and 42b are opened. Further, the front ends of the shutters 54a and 54b (the side opposite to the end pivotally supported by the hinges 55a and 55b) are in contact with the inner wall of the flow paths 42a and 42b opposite to the side where the hinges 55a and 55b are provided. In this state, the flow paths 42a and 42b are closed.

  The shutters 51, 54a, and 54b rotate in a range between a stationary position in a stationary posture shown by a solid line in FIG. 2A and a stationary position in a ceiling hanging posture shown by a two-dot chain line. In the ceiling suspension posture, the positional relationship of each component in FIG. The shutters 51, 54a, and 54b rotate downward by their own weight due to the gravitational action when the projector 1000 is turned upside down from the stationary position to the ceiling position and vice versa.

  In the switching mechanism 50, when the shutter 51 is rotated, the flow path 42a is opened and the flow path 42b is closed in the stationary posture. On the other hand, in the ceiling suspension posture, the flow path 42a is closed and the flow path 42b is opened. That is, in both the standing posture and the ceiling suspension posture, the flow path positioned above the arc tube 20 is opened and the flow path positioned below the arc tube 20 is closed. Thereby, the switching mechanism 50 selectively distributes the cooling air to the flow channel located above the arc tube 20 in the flow channels 42a and 42b in both the standing posture and the ceiling suspension posture.

  In the open / close mechanisms 53a and 53b, the flow path 42a is opened and the flow path 42b is closed in the stationary posture by the rotation of the shutters 54a and 54b. On the other hand, in the ceiling suspension posture, the flow path 42b is opened and the flow path 42a is closed. That is, in both the standing posture and the ceiling suspension posture, the flow path positioned above the arc tube 20 is opened and the flow path positioned below the arc tube 20 is closed.

  Therefore, even when the cooling air leaks and flows in from the gap between the flow path 42a, 42b located below the arc tube 20 and the switching mechanism 50, the flow path positioned below by the opening / closing mechanisms 53a, 53b. Since the air is blocked, the circulation of the cooling air is suppressed. The weights of the shutters 51, 54a, 54b are set so as not to rotate (open / close) due to the flow of cooling air or the like formed in the housing of the projector 1000.

  Next, with reference to FIGS. 3 and 4, the flow of the cooling air in the stationary posture and the ceiling suspension posture will be described. 3 and 4 are diagrams illustrating the flow of cooling air in the light source device according to the first embodiment. Specifically, FIGS. 3A and 3B are diagrams illustrating the flow of the cooling air in the stationary posture, and FIGS. 4A and 4B are diagrams illustrating the flow of the cooling air in the ceiling suspension posture. is there.

  As shown in FIG. 3A, in the stationary posture of the projector 1000, the switching mechanism 50 opens the flow path 42 a positioned on the upper side of the arc tube 20 and the flow path positioned on the lower side of the arc tube 20. 42b closes. The flow path 42a is opened by the opening / closing mechanism 53a, and the flow path 42b is closed by the opening / closing mechanism 53b.

  As shown by the arrows, the cooling air blown from the cooling fan 700 (see FIG. 1) is introduced from the air inlet 41 into the flow path 42a located on the upper side of the arc tube 20, and flows through the flow path 42a. And the cooling air which distribute | circulated the flow path 42a is introduce | transduced into the reflector space part 36 from the opening part 43a, and forms the downward airflow which goes to the downward side from the upper side of the arc_tube | light_emitting_tube 20. FIG.

  At this time, as indicated by an arrow in FIG. 3B, the cooling air descends in the reflector space 36 along the reflecting surface 31. The tube portion 21 of the arc tube 20 is cooled from above by the cooling air. As shown in FIG. 3A, the cooling air warmed by cooling the arc tube 20 is directed to the exhaust port 44 along the reflection surface 31, and is discharged out of the reflector space 36 from the exhaust port 44. The

  Here, as indicated by the dashed arrows in FIG. 3A, the cooling air leaks from the gap between the inner wall of the air inlet 41 and the switching mechanism 50 and flows into the flow path 42 b located below the arc tube 20. There may be cases. When the cooling air flows through the flow path 42 b and is introduced from the opening 43 b into the reflector space 36, the cooling air forms an upward air flow from the lower side of the arc tube 20 toward the upper side. Further, due to the leakage of the cooling air, the amount of the cooling air introduced into the flow path 42a located on the upper side is reduced accordingly. Then, the bulb portion 21 of the arc tube 20 is cooled from the lower side, and cooling of the lower portion of the arc tube 20 becomes excessive, while cooling of the upper portion of the arc tube 20 is insufficient.

  On the other hand, in the light source device 10, even when the cooling air leaks into the flow path 42 b through the gap between the inner wall of the intake port 41 and the switching mechanism 50, the cooling air is blocked because the flow path 42 b is closed by the opening / closing mechanism 53 b. As a result, the flow of cooling air into the flow path 42b is suppressed. Therefore, since the cooling air is not introduced into the reflector space 36 from the opening 43b, an upward air flow from the lower side of the arc tube 20 to the upper side is not formed. Even when the cooling air descending the reflector space 36 flows into the flow path 42b from the opening 43b, the flow path 42b is closed by the opening / closing mechanism 53b, so that the flow path 42b does not flow backward.

  As shown in FIGS. 4A and 4B, in the ceiling-suspended posture of the projector 1000, the top and bottom in the positional relationship of each component of the light source device 10 are reversed from those in the stationary posture. That is, the channel 42b, the opening 43b, and the opening / closing mechanism 53b are positioned above the arc tube 20, and the channel 42a, the opening 43a, and the opening / closing mechanism 53a are positioned below the arc tube 20. .

  As shown in FIG. 4A, in the ceiling-suspended posture of the projector 1000, the switching mechanism 50 opens the flow path 42b located above the arc tube 20, and the flow path located below the arc tube 20. 42a closes. Further, the flow path 42b is opened by the opening / closing mechanism 53b, and the flow path 42a is closed by the opening / closing mechanism 53a.

  The cooling air blown from the cooling fan 700 flows through the flow path 42b located above the arc tube 20 from the air inlet 41 as shown by the arrow, and is introduced into the reflector space 36 from the opening 43b. A downward airflow is formed from the upper side of the arc tube 20 toward the lower side. Then, as shown in FIG. 4B, the cooling air descends along the reflecting surface 31 and cools the bulb portion 21 of the arc tube 20 from above, as shown in FIG. 4A. The air is discharged from the exhaust port 44 to the outside of the reflector space 36.

  In addition, as shown by the dashed arrow, even when the cooling air leaks from the gap between the inner wall of the intake port 41 and the switching mechanism 50 and flows into the flow path 42a, the flow path 42a is blocked by the opening / closing mechanism 53a. Circulation of cooling air is suppressed. Thereby, also in the ceiling suspension posture, the bulb portion 21 of the arc tube 20 is cooled from the upper side.

  Here, the length of the shutters 54a and 54b (the distance between the end portions pivoted on the hinges 55a and 55b and the tip portion) is set to be larger than the inner diameter in the direction orthogonal to the extending direction of the flow paths 42a and 42b. ing. For this reason, the flow paths 42a and 42b are closed in a state where the front ends of the shutters 54a and 54b are in contact with the inner walls of the flow paths 42a and 42b. That is, in the state where the flow paths 42a and 42b are closed, the shutters 54a and 54b and the extending direction of the flow paths 42a and 42b do not have a perpendicular relationship.

  Thereby, the clearance gap between the inner wall of flow path 42a, 42b and shutter 54a, 54b can be suppressed smaller. Further, even when the projector 1000 main body is inclined, the flow paths 42a and 42b can be closed with the tip portions of the shutters 54a and 54b contacting the inner walls of the flow paths 42a and 42b. Then, when the shutters 54a and 54b are rotated and opened from the state in which the flow paths 42a and 42b are closed, the shutters 54a and 54b can be rotated to a predetermined side regardless of the rotation direction that is inverted upside down.

  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) The cooling air is selectively introduced into the channel located above the arc tube 20 by the switching mechanism 50 in both the stationary posture and the ceiling suspension posture. A descending airflow is formed from the upper side of the arc tube 20 toward the lower side. In addition, since the flow path located below the arc tube 20 is closed by the opening / closing mechanisms 53a and 53b provided in the flow paths 42a and 42b, even if cooling air leaks from the gap of the switching mechanism 50, The flow of the cooling air in the channel located on the side is suppressed.

  For this reason, since the upper part of the arc tube 20 is efficiently cooled and excessive cooling of the lower part is suppressed, a temperature difference between the upper part and the lower part of the arc tube 20 hardly occurs. Thereby, it is possible to provide the light source device 10 in which the breakage of the arc tube 20 is suppressed and the life is extended, and the projector 1000 including the light source device 10 can be provided.

  (2) Since the length of the shutters 54a and 54b is set larger than the inner diameter in the direction orthogonal to the extending direction of the flow paths 42a and 42b, the flow paths 42a and The gaps between the inner wall of 42b and the shutters 54a and 54b can be further reduced to block the flow paths 42a and 42b.

  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 the opening / closing mechanism is integrated with the switching mechanism, but the other configurations are substantially the same.

  FIG. 5 is a diagram illustrating a schematic configuration of the light source device according to the second embodiment and a flow of cooling air. Specifically, FIG. 5A is a view of the light source device in the stationary posture as seen from the illuminated region side, and FIG. 5B is a diagram of the light source device in the ceiling posture as seen from the illuminated region side. . 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. 5A and 5B, the light source device 12 according to the second embodiment includes an arc tube 20, a reflector 30, a holding member 40A, a switching mechanism, and a turning mechanism as an opening / closing mechanism. 70.

  The holding member 40A is provided with an intake port 41, connection portions 45a and 45b, flow paths 42a and 42b, openings 43a and 43b, and an exhaust port 44. The connection portion 45a is a portion that connects the intake port 41 and the flow path 42a, and the connection portion 45b is a portion that connects the intake port 41 and the flow path 42b. Therefore, the flow paths 42a and 42b branch from the intake port 41 via the connection portions 45a and 45b. The connection parts 45a and 45b have wall parts 46a and 46b between the flow paths 42a and 42b.

  The rotation mechanism 70 is provided at a branch portion branched from the intake port 41, that is, at a substantially central portion between the connection portions 45a and 45b. The rotation mechanism 70 includes plate-shaped shutters 71 and 72 and a hinge 73 that pivotally supports the shutters 71 and 72. The hinge 73 is disposed on the inner wall on the reflector 30 side in the substantially central portion of the connection portions 45a and 45b.

  The shutters 71 and 72 are integrally formed in a V shape when viewed from the illuminated region side. The shutters 71 and 72 are integrally formed with end portions pivotally supported by the hinge 73 and open at a predetermined angle toward the tip end portion (the side opposite to the end portion pivotally supported by the hinge 73). have. The lengths of the shutters 71 and 72 (the distance between the end portion pivoted on the hinge 73 and the tip portion) are substantially the same.

  The inner walls of the connecting portions 45a and 45b opposite to the hinge 73 have an arc shape centered on the hinge 73 as viewed from the illuminated area side so that the shutters 71 and 72 can be rotated. The distance between the wall portions 46a and 46b and the hinge 73 is shorter than the length of the shutters 71 and 72. The shutters 71 and 72 rotate downward by the gravitational action when the projector 1000 is turned upside down from the stationary position to the ceiling hanging position and vice versa.

  The shutters 71 and 72 are rotatable in a range between a stationary position indicated by a solid line and a stationary position indicated by a two-dot chain line in FIG. The solid line is the position where the shutter 72 is in contact with the wall 46b in the stationary position, and the two-dot chain line is the position where the shutter 71 is in contact with the wall 46a in the ceiling hanging position. By turning the shutters 71 and 72, the flow path is switched by the shutter located on the upper side (upstream side) of the shutters 71 and 72 and the lower side (downstream side) in both the stationary posture and the ceiling hanging posture. ) Is closed by the shutter located at the lower side.

  As described above, the roles of the shutters 71 and 72 are switched between the stationary posture and the ceiling-suspended posture. In any posture, the shutter located above serves as a switching mechanism, and the shutter located below serves as an opening / closing mechanism. To play a role. In addition, since the shutters 71 and 72 are integrally formed, the switching mechanism and the opening / closing mechanism are operated in synchronization when vertically inverted from the standing position to the ceiling position and vice versa. be able to.

  As shown by a solid line in FIG. 5A, in the stationary posture, the flow path 42a is opened and the flow path 42b is closed by the shutter 71 as the switching mechanism. Further, the flow path 42b is closed by a shutter 72 as an opening / closing mechanism. Thereby, the cooling air flows through the flow path 42 a located on the upper side of the arc tube 20 from the intake port 41, and forms a downward air flow from the upper side of the arc tube 20 toward the lower side.

  As shown in FIG. 5B, in the ceiling suspension posture, the flow path 42b is opened by the shutter 72 as the switching mechanism, and the flow path 42a is closed. Further, the flow path 42a is closed by a shutter 71 as an opening / closing mechanism. Thereby, the cooling air flows through the flow path 42b located above the arc tube 20 from the air inlet 41, and forms a descending airflow from the upper side of the arc tube 20 to the lower side.

  According to the configuration of the light source device 12 according to the second embodiment, substantially the same effect as the light source device 10 according to the first embodiment can be obtained. Further, since the rotation mechanism 70 provided at one place serves as an opening / closing mechanism and a switching mechanism, the mechanism for forming the downdraft of the cooling air regardless of the attitude of the projector 1000 can be configured with a simpler configuration. Can be realized.

(Third embodiment)
<Light source device>
Next, a light source device according to a third embodiment will be described with reference to FIG. The light source device according to the third embodiment is different from the light source device according to the first embodiment in that the shutter of the opening / closing mechanism is housed in a recess provided on the inner wall of the flow channel when the flow channel is opened. Are different, but the other configurations are almost the same.

  FIG. 6 is a diagram illustrating a schematic configuration of a light source device according to the third embodiment. Specifically, FIG. 6 is a view of the light source device in the stationary posture as viewed from the illuminated region side. 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 FIG. 6, the light source device 14 according to the third embodiment includes an arc tube 20, a reflector 30, a holding member 40 </ b> B, a switching mechanism 50, and opening / closing mechanisms 53 a and 53 b.

  The holding member 40B is provided with an intake port 41, flow paths 42a and 42b, openings 43a and 43b, and an exhaust port 44. The inner wall of the flow path 42a on the reflector 30 side is provided with a recess 48a that is recessed toward the reflector 30 in a direction substantially orthogonal to the extending direction of the flow path 42a. Further, the inner wall of the flow path 42b on the reflector 30 side is provided with a recess 48b that is recessed toward the reflector 30 in a direction substantially orthogonal to the extending direction of the flow path 42b.

  The hinges 55a and 55b of the opening / closing mechanisms 53a and 53b are disposed in the recesses 48a and 48b, respectively. The shutters 54a and 54b of the opening / closing mechanisms 53a and 53b can be stored in the recesses 48a and 48b, respectively. The opening / closing mechanism 53a is accommodated in the recess 48a in a state where the flow path 42a is opened. The opening / closing mechanism 53b is housed in the recess 48b in a state where the flow path 42b is opened.

  According to the configuration of the light source device 14 according to the third embodiment, substantially the same effect as the light source device 10 according to the first embodiment can be obtained. In addition, since the open / close mechanism is housed in the recess provided in the flow path in the open flow path of the flow paths 42a and 42b, the inner diameter of the flow path opened by the open / close mechanism is narrowed. In addition, it is possible to prevent the flow of the cooling air flowing through the flow path from being hindered.

  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)
In the configuration of the light source device according to the first embodiment and the third embodiment, the opening / closing mechanism is arranged at portions located above and below the reflector in the flow path, but the present invention is limited to this configuration. Not. The structure arrange | positioned in the part located in the side of the reflector in a flow path may be sufficient.

  FIG. 7 is a diagram illustrating a schematic configuration of the light source device according to the first modification. In addition, about the component which is common in the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 7, the light source device 16 according to the first modification includes an arc tube 20, a reflector 30, a holding member 40, a switching mechanism 50, and opening / closing mechanisms 57a and 57b.

  The opening / closing mechanisms 57a and 57b are respectively provided in portions of the flow paths 42a and 42b that are located on the side of the reflector 30 and extend along the direction of gravity. The opening / closing mechanisms 57a and 57b are composed of shutters 58a and 58b and hinges 59a and 59b. The hinges 59a and 59b are disposed on the inner wall of the flow paths 42a and 42b on the side opposite to the reflector 30 side. The lengths of the shutters 58a and 58b are set larger than the inner diameter in the direction orthogonal to the extending direction of the flow paths 42a and 42b.

  In a state where the plate-like surfaces of the shutters 58a and 58b are in contact with the inner walls of the flow paths 42a and 42b on the side where the hinges 59a and 59b are provided, the flow paths 42a and 42b are opened. Further, the flow paths 42a and 42b are closed in a state where the front ends of the shutters 58a and 58b are in contact with the inner wall of the flow paths 42a and 42b opposite to the side where the hinges 59a and 59b are provided. The hinge 52 of the switching mechanism 50 is disposed on the reflector 30 side of the flow paths 42a and 42b, whereas the hinges 59a and 59b of the opening / closing mechanisms 57a and 57b are disposed on the inner wall opposite to the reflector 30 side. Therefore, even if the cooling air leaks from the gap of the switching mechanism 50, the circulation of the cooling air in the flow channel positioned on the lower side of the flow channels 42a and 42b can be further suppressed.

  In the light source device 16, since the lengths of the shutters 58a and 58b are larger than the inner diameter in the direction orthogonal to the extending direction of the flow paths 42a and 42b, even if the flow paths 42a and 42b extend along the direction of gravity. The flow paths 42a and 42b can be opened and closed by rotating the shutters 58a and 58b by the gravity action accompanying the upside down operation. Thus, if the present invention is applied, the degree of freedom of the arrangement position of the opening / closing mechanism can be increased. In addition, it is good also as a structure by which hinge 59a, 59b is arrange | positioned at the inner wall by the side of the reflector 30 in flow path 42a, 42b.

(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, 14, 16 ... Light source device, 20 ... Light emission tube, 30 ... Reflector, 40, 40A, 40B ... Holding member, 41 ... Intake port, 42a, 42b ... A pair of flow path, 48a, 48b ... Recess, 50 ... Switching mechanism, 53a, 53b, 57a, 57b ... Opening / closing mechanism, 51, 54a, 54b, 58a, 58b, 71, 72 ... Shutter, 100 ... Illuminating device, 400R, 400G, 400B ... Liquid crystal device as electro-optic modulator 600 Projection lens, 1000 Projector.

Claims (5)

An arc tube emitting a luminous flux;
A reflector for fixing the arc tube and reflecting the luminous flux;
A holding member for holding the reflector, and a light source device comprising:
The holding member is
An inlet for introducing cooling air for cooling the arc tube;
A pair of flow paths that are branched from the intake port to an upper side and a lower side of the arc tube and are capable of circulating the cooling air;
A switching mechanism that is provided at a branch portion between the intake port and the pair of flow paths, and selectively allows the cooling air to flow into the flow path located above the arc tube among the pair of flow paths;
An opening / closing mechanism that is provided on the downstream side of the cooling air with respect to the switching mechanism and closes the flow path located below the arc tube of the pair of flow paths. Light source device. The light source device according to claim 1,
The opening / closing mechanism has a shutter whose one end is pivotally supported by the inner wall of the flow path,
A distance between the one end and the other end of the shutter is larger than an inner diameter in a direction orthogonal to the extending direction of the flow path. The light source device according to claim 1 or 2,
The light source device, wherein the opening / closing mechanism is formed integrally with the switching mechanism. The light source device according to claim 3,
Each of the channels is provided with a recess that is recessed in a direction substantially orthogonal to the extending direction of the channel,
The light source device, wherein the opening / closing mechanism is housed in the recess in a state where the flow path is opened. The light source device according to any one of claims 1 to 4,
An electro-optic modulator that modulates a light beam emitted from the light source device;
And a projection lens that projects the modulated light from the electro-optic modulator.

Images