JP2011119048A - Light source device and projector - Google Patents

Abstract

Provided are a light source device and a projector that can be reduced in thickness by suppressing a decrease in luminance, and that have a high resistance to vibrations and impacts because a secondary mirror and an arc tube do not easily fall off.
A light source device 10 has a light emitting tube 20 having a light emitting portion 22 and a shape in which one side is deleted when cut by a predetermined plane S, and the light emitted from the light emitting portion 22 emits light emitted from the light emitting portion 22 side. A reflector 30 that reflects light, a secondary mirror 40 that is disposed on one side of the arc tube 20 and reflects light emitted from the light emitting unit 22 to the one side toward the light emitting unit 22, and an end of the reflector 30 on the illuminated region side And the housing 50 is supported on the opposite side of the secondary mirror 40 from the arc tube 20.
[Selection] Figure 2

Description

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

  Conventionally, as a light source device used for a projector, a light emitting tube having a light emitting part and a reflector having a shape in which one side is deleted when cut by a predetermined plane and reflects light emitted from the light emitting part to the illuminated area side And a secondary mirror that is disposed on one side of the light emitting part in the arc tube and reflects light emitted from the light emitting part to the light emitting part side is known (for example, see Patent Document 1).

  Such a light source device has, for example, a configuration in which the secondary mirror is fixed to the arc tube with an adhesive, and the arc tube is fixed to the reflector with the adhesive. According to such a configuration, it is possible to reduce the thickness by deleting one side of the reflector. On the other hand, the secondary mirror is arranged on one side of the light emitting unit to effectively use the light emitted from the light emitting unit. As a result, a decrease in luminance is suppressed.

JP 2007-335196 A

  However, in the light source device as described above, in the configuration including the housing that holds the opening side end portion on the illuminated area side of the reflector, one side of the reflector, that is, the side where the secondary mirror is located is deleted. Therefore, although the secondary mirror is fixed to the arc tube, it is not supported by either the reflector or the housing. For this reason, there is a problem that the secondary mirror is easily dropped from the arc tube and has low resistance to vibration and impact.

  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 has a light-emitting tube having a light-emitting portion and a shape in which one side is deleted when cut at a predetermined plane, and the light emitted from the light-emitting portion is illuminated. A reflector that reflects to the region side, a secondary mirror that is disposed on the one side of the arc tube and reflects light emitted from the light emitting unit to the one side, and the illuminated region of the reflector And a housing that holds a side end, and the side opposite to the arc tube of the secondary mirror is supported by the housing.

  According to this configuration, one side of the reflector is deleted and thinned, and light emitted from the light emitting portion of the arc tube to one side is reflected by the secondary mirror and effectively used, so that a reduction in luminance is suppressed. Here, a reflector is disposed on the arc tube side of the secondary mirror with the arc tube interposed therebetween, and the reflector is held by the housing. Further, the side of the secondary mirror opposite to the arc tube is supported by a housing that holds the reflector. Therefore, the secondary mirror and the arc tube are held between the reflector and the housing. For this reason, it becomes difficult for the secondary mirror to fall off the arc tube, and resistance to vibration and impact is improved. As a result, it is possible to provide a light source device that suppresses a decrease in luminance and is thinned, and that has a high resistance to vibration and impact since the secondary mirror is difficult to drop off.

  Application Example 2 In the light source device according to the application example described above, the housing is connected to the frame portion that holds an end portion of the reflector on the illuminated area side, and is connected to the frame portion and the light source device of the reflector. A plate-like portion disposed on one side and having a surface facing the reflector with the secondary mirror in between, and a support portion provided on the surface of the plate-like portion facing the reflector; The secondary mirror is preferably supported by the support portion.

  According to this structure, a reflector is hold | maintained by the frame part of a housing, and a submirror is supported by the support part provided in the surface side facing the reflector of the plate-shaped part connected to the frame part. Thereby, a secondary mirror can be hold | maintained between a reflector and a housing with an arc_tube | light_emitting_tube.

  Application Example 3 In the light source device according to the application example, it is preferable that the support portion includes a support member having elasticity.

  According to this configuration, the support member having elasticity can suppress the backlash and support the secondary mirror, and can absorb and relieve vibration and impact applied to the secondary mirror. Thereby, the tolerance with respect to a vibration or an impact can be improved more.

  Application Example 4 In the light source device according to the application example described above, it is preferable that the support member has higher thermal conductivity than the frame portion and the plate-like portion.

  According to this configuration, since the support member has higher thermal conductivity than the frame portion and the plate-like portion, the heat emitted from the arc tube and propagated to the secondary mirror can be radiated by the support member. Thereby, it is possible to suppress deterioration of the secondary mirror due to heat.

  Application Example 5 In the light source device according to the application example described above, the support portion further includes a holding member that holds the support member, and the thickness of the holding member includes the plate-like portion, the sub mirror, and the like. It is preferably thinner than the gap.

  According to this configuration, the holding member does not contact the secondary mirror in the normal state. For this reason, a secondary mirror can be supported by the supporting member which has elasticity, without pressing a secondary mirror too much. Further, when the support member is greatly deformed and contracted due to a strong impact or the like, the sub mirror can be supported by the holding member.

  Application Example 6 In the light source device according to the application example described above, it is preferable that the holding member has a lower thermal conductivity than the frame portion and the plate-like portion.

  According to this configuration, since the holding member has a lower thermal conductivity than the frame portion and the plate-like portion, the heat emitted from the arc tube and transmitted to the plate-like portion via the secondary mirror is suppressed by the holding member. Thereby, deterioration of the plate-like portion due to heat can be suppressed.

  Application Example 7 In the light source device according to the application example, it is preferable that the holding member has a region that overlaps a region where the arc tube is projected onto the plate-like portion.

  According to this configuration, since the holding member has a region overlapping the region where the arc tube is projected onto the plate-like portion, not only the heat propagated from the arc tube to the plate-like portion via the secondary mirror, Heat transmitted directly from the arc tube to the plate portion can be suppressed. Thereby, deterioration of the plate-like portion due to heat can be further suppressed.

  Application Example 8 In the light source device according to the application example, the sub mirror may be fixed to the arc tube.

  According to this configuration, since the secondary mirror is fixed to the arc tube, the secondary mirror and the arc tube can be held together. For this reason, it is possible to provide a light source device in which the secondary mirror is less likely to drop off and is more resistant to vibration and impact.

  Application Example 9 In the light source device according to the application example, the sub mirror may be fixed to the support portion.

  According to this configuration, since the secondary mirror is fixed to the support portion, the secondary mirror can be held integrally with the housing. For this reason, it is possible to provide a light source device in which the secondary mirror is less likely to drop off and is more resistant to vibration and impact.

  Application Example 10 In the light source device according to the application example described above, the housing is connected to the frame portion that holds an end portion of the reflector on the illuminated area side, and is connected to the frame portion and the light source device of the reflector. A plate-like portion disposed on the opposite side to the one side and having a surface facing the secondary mirror with the reflector interposed therebetween, and a belt-like support portion spanned between the plate-like portion and the secondary mirror; The secondary mirror may be supported by the support portion.

  According to this configuration, the reflector is held by the frame portion of the housing, and is connected to the frame portion by the belt-like support portion that is connected to the plate portion and disposed on the opposite side of the reflector and is laid around the secondary mirror. A secondary mirror is supported. Thereby, a secondary mirror can be hold | maintained between a reflector and a housing with an arc_tube | light_emitting_tube.

  Application Example 11 A projector according to this application example includes an illumination device including the light source device described above, an electro-optic modulation device that modulates illumination light from the illumination device according to image information, and the electro-optic modulation. And a projection lens that projects the modulated light from the apparatus.

  According to this configuration, it is possible to reduce the thickness without reducing the luminance, and since the light source device of the present invention having high impact resistance is provided, the projector is high-intensity and thin, and further has high impact resistance. Can provide.

1 is a diagram illustrating a schematic configuration of a projector according to a first embodiment. The figure which shows schematic structure of the light source device which concerns on 1st Embodiment. The figure which shows schematic structure of the light source device which concerns on 1st Embodiment. The figure which shows 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 4th Embodiment. The figure which shows schematic structure of the light source device which concerns on 5th Embodiment. The figure which shows schematic structure of the light source device which concerns on the modification 1. As shown in FIG. The figure which shows schematic structure of the light source device which concerns on the modification 2. 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 condenser lenses 300R, 300G, and 300B, and an electro-optic modulation device. The projector includes three liquid crystal devices 400R, 400G, and 400B, a cross dichroic prism 500, a projection optical system 600, and a cooling mechanism (not shown).

  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 a reflector 30, an arc tube 20, a sub mirror 40, and a housing 50. The reflector 30 has a reflecting surface that is a part of a spheroid having a first focal point and a second focal point on the illumination optical axis OC. The first focal point of the reflector 30 is located in the light emitting unit 22 (see FIG. 2) of the arc tube 20. 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 from which the luminous flux is emitted, that is, the opening side of the reflector 30 is also referred to as the illuminated region side. In the light source device 10, the side opposite to the illuminated region side (opening side) is also referred to as 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 condenses a plurality of partial light beams emitted through the first lens array 120, the second lens array 130, and the polarization conversion element 140 and superimposes them in the vicinity of the image forming area of the liquid crystal devices 400R, 400G, and 400B. It is an optical element for making it. 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 condenser lens 300R. The condenser 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 condensing lenses 300G and 300B disposed in the preceding stage of the optical path of the other liquid crystal devices 400G and 400B are configured in the same manner as the condensing lens 300R.

  Of the green light component and the 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 condenser lens 300G, and enters the image forming area of the green light liquid crystal device 400G. On the other hand, the blue light component passes through the dichroic mirror 220 and 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 condensing lens 300B. The light enters the image forming area of the liquid crystal device 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 400 </ b> R, 400 </ b> G, and 400 </ b> B modulate the three color lights separated by the color separation light guide optical system 200 according to image information, and are illumination targets of the illumination device 100. Although not shown, an incident-side polarizing plate is disposed between the condenser lenses 300R, 300G, and 300B and the liquid crystal devices 400R, 400G, and 400B, respectively, and the liquid crystal devices 400R, 400G, and 400B are cross dichroic. An exit-side polarizing plate is disposed between each prism 500.

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

<Light source device>
Next, the light source device according to the first embodiment will be described with reference to FIGS. 2 and 3 are diagrams illustrating a schematic configuration of the light source device according to the first embodiment. Specifically, FIG. 2A is a side view of the light source device 10, and FIG. 2B is a rear view of the light source device 10. 3A is a perspective view showing the configuration of the peripheral portion of the arc tube 20, and FIG. 3B is a cross-sectional view taken along the line AA ′ in FIG. In addition, illustration of the housing 50 is abbreviate | omitted in Fig.3 (a) and (b).

  As described above, the light source device 10 according to the first embodiment includes the reflector 30, the arc tube 20, the secondary mirror 40, and the housing 50. Hereinafter, a case where the projector 1000 is arranged in a so-called stationary state will be described as an example. The arrangement of each component of the light source device 10 in FIGS. 2A and 2B and FIGS. 3A and 3B corresponds to the stationary state of the projector 1000. In the stationary state of the projector 1000, the direction of gravity is the direction from the reflector 30 side toward the secondary mirror 40 side.

  As shown in FIGS. 2A and 2B, the housing 50 includes a frame portion 52, a plate-like portion 54, and a support portion 56. The frame portion 52 is disposed so as to surround the periphery of the opening side (illuminated region side) end portion of the reflector 30, and holds the reflector 30. The plate-like portion 54 is arranged on the side where the sub mirror 40 is arranged in the light source device 10, and is connected to the frame portion 52. The plate-like portion 54 is a flat plate having a substantially rectangular surface facing the reflecting surface of the reflector 30. The frame portion 52 and the plate-like portion 54 are integrally molded, for example, with a heat-resistant synthetic resin material so as to form an L shape when viewed from the side.

  The support portion 56 is provided on the surface side of the plate-like portion 54 facing the reflector 30, that is, on the side of the secondary mirror 40, and is fixed to the plate-like portion 54. The support part 56 is disposed at a position facing the fixing part 44 of the sub mirror 40. For example, the support portion 56 is provided with a groove portion having a V-shaped cross section along the illumination optical axis OC on the side of the sub mirror 40. The support portion 56 is in contact with the fixing portion 44 of the sub mirror 40 at the V-shaped groove portion.

  The support portion 56 is preferably made of a material having higher thermal conductivity than the frame portion 52 and the plate-like portion 54. By configuring the support portion 56 with a material having high thermal conductivity, the heat emitted from the arc tube 20 and propagated to the secondary mirror 40 can be released through the support portion 56. Thereby, deterioration by the heat | fever of the reflection layer formed in the reflective surface of the submirror 40 and the fall of the reflectance resulting from it can be suppressed. Further, by releasing the heat propagated to the secondary mirror 40, it is possible to suppress overheating of the arc tube 20 and suppress deterioration of the metal foil sealed in the sealing portions 24 and 26 due to heat. As such a material having a high thermal conductivity, a material having a desired thermal conductivity can be appropriately selected from, for example, a metal such as an aluminum alloy and a magnesium alloy, a glass material such as quartz and sapphire, and the like.

  As shown in FIGS. 3A and 3B, the arc tube 20 includes a light emitting unit 22 including a pair of electrodes arranged along the illumination optical axis OC, and an illumination optical axis OC on both sides of the light emitting unit 22. A pair of sealing portions 24, 26 extending along the pair, a pair of metal foils respectively sealed in the pair of sealing portions 24, 26, and a pair electrically connected to the pair of metal foils, respectively. Lead wire. When a voltage is applied to the lead wire, a potential difference is generated between the pair of electrodes, discharge occurs, and an arc image is generated.

  The arc tube 20 is disposed such that the sealing portion 24 is located on the back side of the reflector 30 with respect to the light emitting portion 22. The arc tube 20 is fixed to the reflector 30 with, for example, an adhesive c filled between the sealing portion 24 and the reflector 30. The adhesive c is, for example, cement. A ceramic heat resistant adhesive or the like may be used as the adhesive c.

  The light emitting unit 22 and the sealing units 24 and 26 are made of, for example, quartz glass, and mercury, a rare gas, and a small amount of halogen are enclosed in the light emitting unit 22. The electrode is, for example, a tungsten electrode, and the metal foil is, for example, a molybdenum foil. The lead wire is made of, for example, molybdenum or tungsten. In addition, 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.

  As shown in FIG. 3A, the reflector 30 has an approximately elliptical shape of an elliptic sphere obtained by rotating the ellipsoid about the illumination optical axis OC as the rotation center axis. That is, approximately half of the elliptic sphere in the direction along the illumination optical axis OC is deleted, and when cut along a predetermined plane S including the illumination optical axis OC, one side, that is, the arc tube 20 Thus, the end 30z on the side of the secondary mirror 40 is removed. Therefore, the end of the reflector 30 on the opening side (illuminated region side) has a substantially semicircular shape. Hereinafter, the side from which the end 30z of the reflector 30 is deleted is also referred to as one side.

The reflector 30 has a reflecting surface that reflects the light emitted from the light emitting unit 22 located in the vicinity of the first focus toward the second focus position on the illuminated area side. For example, crystallized glass, alumina (Al ₂ O ₃ ), or the like can be suitably used as the material for the base material constituting the reflecting surface. On the inner surface of the reflecting surface, 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.

  As shown in FIGS. 3A and 3B, the secondary mirror 40 is located on the opposite side of the arc tube 20 from the reflector 30, that is, on one side where the end 30 z of the reflector 30 is removed. . The sub mirror 40 includes a reflecting portion 42 and a fixing portion 44 that is connected to the reflecting portion 42 and extends along the illumination optical axis OC. The secondary mirror 40 is made of, for example, hard glass or quartz glass. The material of the secondary mirror 40 may be a metal.

The reflecting part 42 has, for example, a substantially hemispherical shape in which approximately 1/2 of the sphere on the reflector 30 side is deleted. The reflection unit 42 is disposed so as to cover one side of the light emitting unit 22, and has a reflection surface that reflects light emitted from the light emitting unit 22 toward the light emitting unit 22. That is, the sub mirror 40 is disposed so that the reflection surface side of the reflection portion 42 faces the reflection surface side of the reflector 30. On the reflecting surface of the reflecting portion 42, for example, a reflecting layer made of a dielectric multilayer film of tantalum oxide (Ta ₂ O ₅ ) and silicon oxide (SiO ₂ ) is formed.

  The fixing portion 44 is located on the sealing portion 24 side of the arc tube 20 in the direction along the illumination optical axis OC. The fixed portion 44 has, for example, a shape in which approximately half of the cylindrical shape extending along the illumination optical axis OC is removed from the reflector 30 side. The secondary mirror 40 is fixed to the arc tube 20 by, for example, an adhesive c filled between the sealing portion 24 and the fixing portion 44. The secondary mirror 40 is supported by a support portion 56 that is in contact with the opposite side of the reflecting surface of the fixed portion 44, that is, a housing 50 (see FIGS. 2A and 2B).

  According to the configuration of the light source device 10 according to the first embodiment, since the end 30z on one side of the reflector 30 is deleted, the light source device 10 can be thinned. On the other hand, the secondary mirror 40 is disposed so as to cover one side of the light emitting unit 22, and the light emitted from the arc tube 20 to the secondary mirror 40 side can be reflected and effectively used. A decrease in luminance due to the deletion of one side can be suppressed.

  By the way, in the stationary state of the projector 1000, the arc tube 20 is located below the reflector 30 in the gravitational direction, and the secondary mirror 40 is located below the arc tube 20 in the gravitational direction. The secondary mirror 40 is fixed to the arc tube 20 and is held as a single unit. However, when the secondary mirror 40 is not supported by the housing 50, gravity acts in the direction of dropping the secondary mirror 40 from the arc tube 20. The secondary mirror 40 may fall off the arc tube 20 due to impact or vibration. It is also conceivable that the arc tube 20 falls off the reflector 30 together with the sub mirror 40.

  On the other hand, according to the configuration of the light source device 10 according to the first embodiment, the housing 50 (supporting portion) on the opposite side of the secondary mirror 40 from the arc tube 20 is located below the secondary mirror 40 in the gravitational direction. 56). For this reason, it becomes difficult for the secondary mirror 40 to fall off the arc tube 20. Further, since the arc tube 20 is fixed to the reflector 30 and supported by the housing 50 via the sub mirror 40, it is difficult to drop off the reflector 30.

  Furthermore, since the reflector 30 to which the arc tube 20 is fixed is held by the housing 50, the secondary mirror 40 and the arc tube 20 are held between the reflector 30 and the housing 50 on both upper and lower sides in the direction of gravity. It becomes. For this reason, the tolerance with respect to a vibration or an impact improves. As described above, according to the configuration of the light source device 10, it is possible to provide a light source device that suppresses a decrease in luminance and is thinned, and that has a high resistance to vibration and impact, in which the secondary mirror 40 and the arc tube 20 are not easily dropped.

  When the projector 1000 is arranged in a so-called ceiling state, the positional relationship in the gravity direction of each component is reversed as compared with the case where the projector 1000 is arranged in a stationary state. However, the secondary mirror 40 and the arc tube 20 are in the direction of gravity. It is held between the reflector 30 and the housing 50 on both the upper and lower sides. Therefore, when the projector 1000 is arranged in the ceiling state, the same effect as that in the stationary state can be obtained.

  The configuration of the light source device 10 according to the first embodiment has been described above, but the configuration of the light source device 10 is not limited to the above configuration. The support portion 56 is made of the same material as the frame portion 52 and the plate-like portion 54, and may be integrally formed with the frame portion 52 and the plate-like portion 54. Further, the side of the support portion 56 facing the sub mirror 40 may be planar. Even with such a configuration, the secondary mirror 40 and the arc tube 20 can be prevented from falling off, and resistance to vibration and impact can be increased.

(Second Embodiment)
<Light source device>
Next, a light source device according to a second embodiment will be described with reference to FIGS. The light source device according to the second embodiment is different from the light source device according to the first embodiment in that the support portion in the housing is made of a material having low thermal conductivity, but the other configuration. Are the same.

  In the light source device 10 according to the second embodiment, the support portion 56 shown in FIGS. 2A and 2B is made of a material having lower thermal conductivity than the frame portion 52 and the plate-like portion 54. As such a material having a low thermal conductivity, a material having a desired thermal conductivity can be appropriately selected from ceramics or the like, for example.

  By configuring the support portion 56 with a material having low thermal conductivity, it is emitted from the arc tube 20 shown in FIGS. 3A and 3B and propagated to the plate-like portion 54 via the sub mirror 40 and the support portion 56. Heat is suppressed by the support portion 56. Thereby, deterioration by the heat | fever of the plate-shaped part 54 can be suppressed.

  According to the configuration of the light source device 10 according to the second embodiment, a light source device that suppresses a decrease in luminance and is thinned, and that has a high resistance to vibration and impact, in which the secondary mirror 40 and the arc tube 20 are difficult to drop off, is provided. Although it is the same as that of 1st Embodiment about the point which can be performed, the deterioration by the heat | fever of the plate-shaped part 54 can be suppressed by suppressing the heat which the support part 56 propagates to the plate-shaped part 54. FIG.

(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 devices according to the first embodiment and the second embodiment in the configuration of the support portion in the housing, but the other configurations are the same. is there.

  FIG. 4 is a diagram illustrating a schematic configuration of the light source device according to the third embodiment. Specifically, FIG. 4A is a cross-sectional view of the light source device 10A according to the third embodiment, and corresponds to a cross section taken along the line A-A ′ in FIG. FIG. 4B is a rear view of the light source device 10A. 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 FIGS. 4A and 4B, the light source device 10A according to the third embodiment includes a reflector 30, an arc tube 20, a secondary mirror 40, and a housing 50A. The housing 50 </ b> A includes a frame part 52, a plate-like part 54, and a support part 60. In FIG. 4B, only the support portion 60 is shown in a cross-section in a direction orthogonal to the illumination optical axis OC (see FIG. 4A) in order to easily show the configuration of the support portion 60.

  The support unit 60 includes a support member 61 and a holding member 62. The holding member 62 is fixed to the surface of the plate-like portion 54 that faces the reflector 30. The holding member 62 has a concave portion at a position facing the fixing portion 44 (secondary mirror 40). The support member 61 is disposed in the recess of the holding member 62 and is in contact with the fixed portion 44. That is, the opposite side of the arc tube 20 of the secondary mirror 40 is supported by the support member 61.

  The support member 61 is made of an elastic material. The support member 61 is, for example, a coil spring made of metal. Also in the light source device 10A, since the sub mirror 40 is supported by the support portion 60 (support member 61), it is possible to provide a light source device that is difficult to drop off and that has high resistance to vibration and impact.

  Here, in the configuration of the light source device 10 according to the above-described embodiment, there is a backlash between the support unit 56 and the sub mirror 40 due to variations in the shapes of the support unit 56 and the sub mirror 40, the positional relationship between them, and the like. A case where the auxiliary mirror 40 is excessively pressed by the support portion 56 can be considered. On the other hand, according to the configuration of the light source device 10A according to the third embodiment, the elastic support member 61 supports the secondary mirror 40 while suppressing backlash, and vibrations and impacts applied to the secondary mirror 40 are supported. Can be absorbed and relaxed. Thereby, compared with the said embodiment, the tolerance with respect to a vibration or an impact can be improved more.

  In the direction along the direction of gravity, it is preferable that the thickness around the recess in the holding member 62 is set to be thinner than the gap between the plate-like portion 54 and the sub mirror 40. According to such a configuration, since the holding member 62 does not contact the secondary mirror 40 in the normal state, the support member 61 can support the secondary mirror 40 without excessively pressing it. Further, even when the support member 61 is greatly deformed and contracted due to strong vibration or impact, the sub mirror 40 can be reliably supported by the holding member 62.

  Therefore, according to the configuration of the light source device 10A according to the third embodiment, since the support portion 60 includes the support member 61 and the holding member 62, it is possible to more surely prevent the secondary mirror 40 from falling off, Resistance to impact can be further increased.

  The support member 61 is made of a material having higher thermal conductivity than the frame portion 52 and the plate-like portion 54, and the holding member 62 is made of a material having lower heat conductivity than the frame portion 52 and the plate-like portion 54. Preferably it is. According to such a configuration, the heat propagated from the arc tube 20 to the secondary mirror 40 is released by the support member 61, and is also propagated from the arc tube 20 to the plate-like portion 54 via the secondary mirror 40 and the support portion 60. Heat. As a result, the light source device 10A according to the third embodiment has the effect of suppressing the deterioration due to heat of the reflective layer of the secondary mirror 40 and the metal foil of the sealing portion 24 in the configuration of the first embodiment, and the second embodiment. It is possible to have an effect of suppressing deterioration of the plate-like portion 54 due to heat in the configuration of the form.

(Fourth embodiment)
<Light source device>
Next, a light source device according to a fourth embodiment will be described with reference to FIG. The light source device according to the fourth embodiment is different from the light source device according to the third embodiment in the configuration of the support member in the support portion of the housing, but the other configurations are the same.

  FIG. 5 is a diagram illustrating a schematic configuration of a light source device according to the fourth embodiment. Specifically, FIG. 5A is a cross-sectional view of the light source device 10B according to the fourth embodiment, and corresponds to a cross section taken along line A-A ′ in FIG. FIG. 5B is a rear view of the light source device 10B. In addition, about the component which is common in 3rd 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 10B according to the fourth embodiment includes a reflector 30, an arc tube 20, a sub mirror 40, and a housing 50B. The housing 50 </ b> B includes a frame part 52, a plate-like part 54, and a support part 64. In FIG. 5B, only the support 64 is shown in a cross-section in a direction orthogonal to the illumination optical axis OC (see FIG. 5A) for easy understanding of the configuration of the support 64.

  The support part 64 includes a support member 65 and a holding member 62. The support member 65 is disposed in the recess of the holding member 62 and supports the secondary mirror 40 in contact with the fixed portion 44. The support member 65 is made of an elastic material. The support member 65 is a leaf spring made of metal, for example. According to the configuration of the support member 65 according to the fourth embodiment, similarly to the support member 61 according to the third embodiment, while supporting the secondary mirror 40 while suppressing backlash, vibration applied to the secondary mirror 40 and An impact or the like can be absorbed and reduced by the support member 65. Thereby, the tolerance with respect to a vibration or an impact can be improved more.

  Further, the material of the support member 65 is preferably made of a material having a higher thermal conductivity than the frame portion 52 and the plate-like portion 54. According to such a configuration, the heat propagated from the arc tube 20 to the secondary mirror 40 is released by the support member 65, thereby suppressing deterioration of the reflective layer of the secondary mirror 40 and the metal foil of the arc tube 20 due to heat. Can do. Thus, according to the configuration of the light source device 10B according to the fourth embodiment, the same effect as that of the light source device 10A according to the third embodiment can be obtained.

  Note that the length of the support member 65 in the extending direction of the fixed portion 44 may be set as long as possible within a range in which the clearance between the holding member 62 and the reflection portion 42 can be secured. In this way, by increasing the surface area of the support member 65, the heat dissipation effect by the support member 65 can be enhanced.

(Fifth embodiment)
<Light source device>
Next, a light source device according to a fifth embodiment will be described with reference to FIG. The light source device according to the fifth embodiment is different from the light source device according to the third embodiment in the configuration of the holding member in the support portion of the housing, but the other configurations are the same.

  FIG. 6 is a diagram illustrating a schematic configuration of a light source device according to the fifth embodiment. Specifically, FIG. 6A is a cross-sectional view of the light source device 10C according to the fifth embodiment, and corresponds to a cross section taken along line A-A ′ in FIG. FIG. 6B is a rear view of the light source device 10C. In addition, about the component which is common in 3rd Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIGS. 6A and 6B, the light source device 10C according to the fifth embodiment includes a reflector 30, an arc tube 20, a sub mirror 40, and a housing 50C. The housing 50 </ b> C includes a frame part 52, a plate-like part 54, and a support part 66. In FIG. 6B, only the support portion 66 is shown in a cross-section in a direction orthogonal to the illumination optical axis OC (see FIG. 6A) in order to easily show the configuration of the support portion 66.

  The support part 66 includes a support member 61 and a holding member 67. The holding member 67 is fixed to the surface of the plate-like portion 54 that faces the reflector 30. The holding member 67 has a concave portion at a position facing the fixed portion 44 (secondary mirror 40), and the support member 61 is disposed in the concave portion. The holding member 67 is made of a material having a lower thermal conductivity than the frame portion 52 and the plate-like portion 54. The material of the holding member 67 is made of the same material as the holding member 62 according to the third embodiment, for example.

  The holding member 67 according to the fifth embodiment has a region overlapping the region where the arc tube 20 is projected onto the plate-like portion 54. According to such a configuration of the holding member 67, not only is the heat transmitted from the arc tube 20 to the plate-like portion 54 via the sub mirror 40 and the support portion 66, but also the heat generated from the arc tube 20. Can be prevented from being directly propagated to the plate-like portion 54. Therefore, deterioration of the plate-like portion 54 due to heat can be further suppressed. Note that the holding member 67 may cover as wide a region as possible on the surface of the plate-like portion 54 facing the secondary mirror 40 as long as a clearance with other components can be secured.

  Thus, according to the configuration of the light source device 10C according to the fifth embodiment, the same effect as that of the light source device 10A according to the third embodiment can be obtained, and the light source device 10A according to the third embodiment can be used. In comparison, the deterioration of the plate-like portion 54 due to heat can be further suppressed. In addition, you may apply the structure of the holding member 67 which concerns on 5th Embodiment to the support part 64 which concerns on 4th Embodiment. Even in such a configuration, the same effect as described above can be obtained.

  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 of the above embodiment, the support portion of the housing is provided on the surface side facing the elliptical reflector of the plate-like portion, but the present invention is not limited to this form. Support portions may be provided at different positions in the housing. FIG. 7 is a diagram illustrating a schematic configuration of the light source device according to the first modification. Specifically, FIG. 7A is a side view of the light source device, and FIG. 7B is a rear view of the light source device. 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 FIGS. 7A and 7B, the light source device 11 according to the first modification includes a reflector 30, an arc tube 20, a sub mirror 40, and a housing 51. The housing 51 includes a frame portion 52, a plate-like portion 54, a plate-like portion 58, and a support portion 70.

  The plate-like portion 58 is connected to the frame portion 52 and is disposed on the opposite side of the plate-like portion 54 with the reflector 30 interposed therebetween, and has a surface facing the reflecting surface of the secondary mirror 40. . The plate-like portion 58 is connected to the frame portion 52, and the frame portion 52, the plate-like portion 54, and the plate-like portion 58 are integrally molded. The support part 70 is made of, for example, metal and has an endless belt-like shape (flat belt shape). The support portion 70 is disposed so as to be spanned between the plate-like portion 58 and the sub mirror 40.

  Also in the configuration of the light source device 11 according to the modified example 1, the side opposite to the arc tube 20 of the secondary mirror 40 is supported by the support portion 70. Can be provided. The support portion 70 may have a single band shape and both ends thereof may be connected to the plate-like portion 58. Further, the housing 51 may not have the plate-like portion 54.

(Modification 2)
In the configuration of the light source device of the above embodiment, the secondary mirror is fixed to the arc tube, but the present invention is not limited to this configuration. The secondary mirror may be fixed to the support portion in the housing. FIG. 8 is a diagram illustrating a schematic configuration of a light source device according to the second modification. Specifically, FIG. 8 is a rear view of the light source device. 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 illustrated in FIG. 8, the light source device 10 </ b> D according to Modification 2 includes a reflector 30, an arc tube 20, a sub mirror 40, and a housing 50. The sub mirror 40 is fixed to the support portion 56 with an adhesive c filled between the support portion 56 and the fixing portion 44 of the housing 50. Accordingly, the secondary mirror 40 is held integrally with the support portion 56 (housing 50). Even in the configuration of the light source device 10D according to the modified example 2, it is possible to provide a light source device that has a high resistance to vibration and impact because the secondary mirror 40 is less likely to drop off.

(Modification 3)
In the projector configuration 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 4)
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 an electro-optic modulation device as a light modulation means, such as a transmission type liquid crystal device, transmits light, and “reflection type” This means that an electro-optic modulation device as a light modulation means, such as a reflective liquid crystal device, 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 5)
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 6)
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 7)
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 8)
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 10,10A, 10B, 10C, 10D ... Light source device, 20 ... Light emission tube, 22 ... Light emission part, 30 ... Reflector, 40 ... Secondary mirror, 50, 50A, 50B, 50C ... Housing, 52 ... Frame part, 54, 58 ... Plate-like part, 56, 60, 64, 66, 70 ... Support part, 61, 65 ... Support member, 62, 67 ... Holding member, 100 ... Illumination device, 120 ... First lens array, 122 ... First small lens , 130 ... second lens array, 132 ... second small lens, 140 ... polarization conversion element, 150 ... superposition lens, 200 ... color separation light guide optical system, 210, 220 ... dichroic mirror, 230, 240, 250 ... reflection mirror 260 ... incident side lens, 270 ... relay lens, 300R, 300G, 300B ... condensing lens, 400R, 400G, 400B ... liquid crystal device as an electro-optic modulator , 500 ... cross dichroic prism 600 ... projection optical system, 1000 ... projector.

Claims (11)

An arc tube having a light emitting part;
A reflector that has a shape in which one side is deleted when cut along a predetermined plane, and reflects light emitted from the light-emitting portion toward the illuminated region; and
A sub-mirror disposed on the one side of the arc tube and reflecting light emitted from the light-emitting unit to the one side toward the light-emitting unit;
A housing that holds an end of the reflector on the illuminated area side, and
The light source device, wherein a side of the sub mirror opposite to the arc tube is supported by the housing. The light source device according to claim 1,
The housing is
A frame for holding an end of the reflector on the illuminated area side;
A plate-like portion connected to the frame portion and disposed on the one side of the reflector, and having a surface facing the reflector with the secondary mirror in between;
A support portion provided on the surface of the plate-like portion facing the reflector, and
The secondary mirror is supported by the support portion. The light source device according to claim 2,
The light source device, wherein the support portion includes a support member having elasticity. The light source device according to claim 3,
The light source device, wherein the support member has higher thermal conductivity than the frame portion and the plate-like portion. The light source device according to claim 3 or 4,
The support portion further includes a holding member that holds the support member,
The light source device according to claim 1, wherein a thickness of the holding member is thinner than a gap between the plate-like portion and the sub mirror. The light source device according to claim 5,
The light source device, wherein the holding member has a lower thermal conductivity than the frame portion and the plate-like portion. The light source device according to claim 6,
The light source device, wherein the holding member has a region where the arc tube overlaps a region projected on the plate-like portion. The light source device according to any one of claims 1 to 7,
The secondary mirror is fixed to the arc tube. The light source device according to claim 1 or 2,
The light source device, wherein the sub mirror is fixed to the support portion. The light source device according to claim 1,
The housing is
A frame for holding an end of the reflector on the illuminated area side;
A plate-like part connected to the frame part and disposed on the side opposite to the one side of the reflector, and having a surface facing the secondary mirror across the reflector;
A belt-like support portion that is hung around the plate-like portion and the secondary mirror;
The secondary mirror is supported by the support portion. An illumination device comprising the light source device according to any one of claims 1 to 10,
An electro-optic modulation device that modulates illumination light from the illumination device according to image information;
A projection lens that projects the modulated light from the electro-optic modulator;
A projector comprising:

Images