JP2011181430A - Light source device, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device with deterioration of luminance suppressed, with a thinness achieved and with a secondary mirror hardly falling down, and with strength deterioration of a sealing part of an arc tube suppressed, and to provide a projector. <P>SOLUTION: The light source device 10 includes an arc tube 20 having a bulb part 21, sealing parts 22a, 22b, metal foils 26a, 26b, and electrodes 24a, 24b, a reflector 30 having a shape in which one side is deleted when it is cut by a prescribed plane S and a reflecting part 32 reflecting the light emitted from the bulb part 21 to an illuminating area side, a secondary mirror 40 having a reflecting part 42 which is arranged on the opposite side to the reflector 30 with the arc tube 20 interposed and is arranged facing the bulb part 21, and a fixing part 44 extending from the reflection part 42, and an adhesive agent C1 arranged between the sealing part 22a and the fixing part 44 and fixing tight the arc tube 20 and the secondary mirror 40. The adhesive agent C1 is arranged at a position separated further from the arc tube part 21 than the end part of electrodes 24a, 24b on the sealing parts 22a side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  Inside the tube part (valve part), a pair of sealing parts extending on both sides thereof, a pair of conductive foils sealed in each sealing part, and the one end part facing each other An arc tube having a pair of electrodes enclosed and electrically connected to each conductor foil, and a reflector (main reflection) arranged so that the reflecting portions face each other with the tube portion in between A light source device including a mirror and a secondary mirror is known (see, for example, Patent Document 1). The secondary mirror is fixed to one sealing part with an adhesive, for example.

JP 2005-309372 A

  In the light source device having the above-described configuration, if the secondary mirror is fixed at a position where the end portion of the electrode is connected to the conductor foil, the stress caused by the difference in thermal expansion coefficient between the electrode and the sealing portion Further, there is a problem that stress due to the difference in thermal expansion coefficient between the sealing portion and the adhesive is applied, and stress is concentrated on the position of the sealing portion and a strong load is applied. When a strong load is applied, the strength of the sealed portion of the arc tube is reduced. Therefore, in Patent Document 1, the secondary mirror has a cylindrical fixing part, and stress concentration is avoided by arranging an adhesive at a position away from the end of the electrode (electrode shaft) in the fixing part. I am doing so.

  However, in the configuration of the light source device described in Patent Document 1, the entire circumference of the portion where the electrode is located in the sealing portion is covered with the secondary mirror, and the side opposite to the tube portion (bulb portion) with respect to the electrode is the secondary side. It is in a state of being blocked by an adhesive disposed between the mirror. Therefore, it is difficult for heat generated from the tube portion to be dissipated between the sealing portion and the secondary mirror, and there is a risk of increasing stress due to the difference in coefficient of thermal expansion between the electrode and the sealing portion. There was a problem that there was.

  Further, in the configuration of the light source device described in Patent Document 1, when the fixing portion of the secondary mirror having a cylindrical shape is lengthened, the reflected light from the reflector is blocked. For this reason, the range in which the adhesive can be disposed is restricted, and there is a problem that the adhesive cannot be disposed at a position sufficiently away from the electrode, or that the adhesive placement area may be reduced and the fixing force may be reduced.

  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 tube bulb, a pair of sealing portions extending along the illumination optical axis on both sides of the tube bulb, and the pair of sealing portions. A pair of conductive foils sealed with each other, and a pair of the conductive foils enclosed in the tube portion so that one end portions thereof face each other and the other end portions are electrically connected to the tube portion side of the pair of conductor foils An arc tube having a first electrode, and a first reflecting portion that has a shape in which one side is deleted when cut along a predetermined plane, and reflects light emitted from the bulb portion to the illuminated region side A reflector having a second reflecting portion disposed opposite to the bulb portion, and the pair of the second reflecting portion from the second reflecting portion. A secondary mirror having a fixed portion extending along one of the sealing portions, the one sealing portion and the one A first adhesive that is disposed between a fixed portion and fixes the arc tube and the secondary mirror, and the first adhesive is disposed on the one sealing portion side of the electrode. It arrange | positions in the position away from the said bulb part rather than the said other end part.

  According to this configuration, one side of the reflector is deleted to make it thinner, and the light emitted from the bulb portion of the arc tube to the side from which the reflector has been deleted is reflected by the secondary mirror and used effectively. Therefore, it is possible to reduce the thickness of the light source device while suppressing a decrease in luminance. The first adhesive for fixing the arc tube and the secondary mirror is disposed between the fixing portion and the sealing portion of the secondary mirror at a position farther from the other end portion of the electrode with respect to the bulb portion. Has been. For this reason, the position where the stress resulting from the difference in thermal expansion coefficient between the first adhesive and the sealing portion is applied is the position where the end of the electrode is connected to the conductive foil, that is, the electrode, the conductive foil, and the sealing portion. It is possible to avoid the concentration of stress at this position by moving away from the position where the stress due to the difference in thermal expansion coefficient from the position where the stress is applied is away from the tube portion.

Further, according to this configuration, the secondary mirror is disposed on the opposite side of the reflector with the arc tube interposed therebetween. For this reason, since the light emitted from the tube portion and reflected by the reflector is not blocked by the secondary mirror, the fixed portion is extended and the end of the electrode is a conductor as compared with the case where the secondary mirror is fixed in a cylindrical shape. A 1st adhesive agent can be arrange | positioned in the position further away from the position connected to foil. In addition, compared to the case where the fixing part of the secondary mirror is cylindrical, the heat generated from the tube part is not radiated between the sealing part and the secondary mirror and is easily radiated. The increase in stress due to the difference in the coefficient of thermal expansion is suppressed.
As a result, since the strength reduction of the sealed portion of the arc tube can be suppressed, the quality and life of the light source device can be improved.

  Application Example 2 In the light source device according to the application example described above, a pair of lead wires each having one end portion electrically connected to the side opposite to the side to which the pair of electrodes are connected in the pair of conductor foils. The first adhesive is further away from the tube portion than the one end portion of the lead wire from the one end portion of the lead wire, or from the conductor foil in the one sealing portion. It is preferable that they are arranged at different positions.

  According to this configuration, the stress due to the difference in thermal expansion coefficient between the lead wire and the sealing portion is applied to the position where the end portion of the lead wire is connected to the conductor foil. 1 adhesive is placed. For this reason, the position where the stress due to the difference in the thermal expansion coefficient between the first adhesive and the sealing portion is applied is moved away from the position where the end of the lead wire is connected to the conductor foil, Stress concentration can be avoided.

  Application Example 3 In the light source device according to the application example described above, it is preferable that the fixing portion of the secondary mirror is extended to a position of an end portion of the one sealing portion.

  According to this configuration, since the fixing portion of the secondary mirror is extended to the position of the end portion of the sealing portion, the region where the first adhesive is disposed can be widened to increase the fixing force. Moreover, the freedom degree in the setting of the arrangement position of the 1st adhesive agent can be raised.

  Application Example 4 In the light source device according to the application example described above, the reflector includes a base portion that extends from the first reflecting portion along one of the pair of sealing portions, and The second adhesive is further disposed between the sealing portion and the base, and fixes the arc tube and the reflector, and the second adhesive includes the second adhesive in the one sealing portion. It is preferable that the electrode is disposed at a position farther from the tube portion than the other end portion of the electrode.

  According to this configuration, in the one sealing portion where the first adhesive is disposed, the second adhesion for fixing the arc tube and the reflector at a position farther from the bulb than the other end of the electrode. Agent is placed. For this reason, the position where the stress resulting from the difference in the coefficient of thermal expansion between the second adhesive and the sealing portion is applied is in a direction away from the tube portion with respect to the position where the end of the electrode is connected to the conductor foil. It can be separated to avoid stress concentration at this location.

  Application Example 5 In the light source device according to the application example described above, the second adhesive is disposed in the one sealing portion where the first adhesive is disposed, and the first adhesive It is preferable that either one of the adhesive and the second adhesive is disposed at a position farther from the tube portion than the other.

  According to this configuration, the position at which the first adhesive is disposed and the position at which the second adhesive are disposed in one sealing portion are separated from each other. For this reason, the stress resulting from the difference in the thermal expansion coefficient between the first adhesive and the sealing part and the stress resulting from the difference in the thermal expansion coefficient between the second adhesive and the sealing part are applied. The positions can be made different from each other, and each position can be made different from the position to which the stress caused by the difference in thermal expansion coefficient between the electrode and the sealing portion is applied, and these stresses can be dispersed.

  Application Example 6 In the light source device according to the application example, the first adhesive is disposed at a position closer to the tube portion than the one end of the lead wire, and the second adhesive It is preferable that the adhesive is disposed at a position farther from the tube portion than the conductor foil.

  According to this configuration, the position where the stress due to the difference in thermal expansion coefficient between the electrode and the sealing portion is applied, the position where the stress due to the difference in thermal expansion coefficient between the lead wire and the sealing portion is applied, The position where the stress due to the difference in the thermal expansion coefficient between the first adhesive and the sealing portion is applied and the position where the stress due to the difference in the thermal expansion coefficient between the second adhesive and the sealing portion is applied to each other. Different stresses can be distributed.

  Application Example 7 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, since the light source device in which the strength reduction of the sealing portion of the arc tube is suppressed and the quality and life are improved is provided, a highly reliable projector can be provided.

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 explaining the manufacturing method of the secondary mirror 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. 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 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 lens 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 an arc tube 20, a reflector 30, and a secondary mirror 40. The reflector 30 has a reflecting surface 31 (see FIG. 2) 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 (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 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 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 lens 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 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 perspective view illustrating a configuration of a main part of the light source device 10, and FIG. 2B is a cross-sectional view taken along the line AA ′ in FIG. In FIG. 2A, the lead wires 28a and 28b and the adhesives C1 and C2 are not shown.

  Hereinafter, a case where the projector 1000 is arranged in a so-called stationary state will be described as an example. The arrangement of the components of the light source device 10 in FIGS. 2A and 2B 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 light source device 10 according to the first embodiment includes an arc tube 20, a reflector 30, a secondary mirror 40, and an adhesive C1 as a first adhesive. And an adhesive C2 as a second adhesive.

  The arc tube 20 includes a tube portion 21, a pair of sealing portions 22a and 22b, a pair of electrodes 24a and 24b, a pair of metal foils 26a and 26b as conductor foils, and a pair of lead wires 28a and 28b. have. 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 are extended from the tube portion 21 on both sides along the illumination optical axis OC. Of the sealing portions 22 a and 22 b, the sealing portion 22 a is disposed on the illuminated region side of the tube portion 21, and the sealing portion 22 b is opposite to the illuminated region side of the tube portion 21, that is, the back surface. Arranged on the side. 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 electrodes 24a and 24b are sealed in the tube portion 21 so that one end portions thereof face each other. A discharge portion is formed at one end of the electrodes 24a and 24b facing each other. The electrode 24a extends toward the sealing portion 22a along the illumination optical axis OC, and the electrode 24b extends toward the sealing portion 22b along the illumination optical axis OC. An end portion of the electrode 24a on the sealing portion 22a side is electrically connected to the tube portion 21 side of the metal foil 26a at the connection portion 25a. The end portion of the electrode 24b on the sealing portion 22b side is electrically connected to the tube portion 21 side of the metal foil 26b at the connection portion 25b. The electrodes 24a and 24b are made of a metal such as tungsten, for example.

  The metal foils 26a and 26b extend along the illumination optical axis OC and are sealed in the sealing portions 22a and 22b, respectively. The metal foils 26a and 26b are made of a metal such as molybdenum, for example. The electrode 24a and the metal foil 26a are fixed, for example, by welding at the connection portion 25a. The electrode 24b and the metal foil 26b are fixed, for example, by welding at the connection portion 25b.

  The lead wires 28a and 28b extend along the illumination optical axis OC, and one end portions are sealed in the sealing portions 22a and 22b, respectively. One end of the lead wire 28a is electrically connected by a connection portion 27a located on the opposite side of the metal foil 26a from the connection portion 25a. One end of the lead wire 28b is electrically connected by a connection portion 27b located on the opposite side of the metal foil 26b from the connection portion 25b.

  The lead wires 28a and 28b are made of a metal such as molybdenum or tungsten, for example. The metal foils 26a, 26b and the lead wires 28a, 28b are fixed at the connecting portions 27a, 27b, for example, by welding. The other end portion of the lead wire 28a extends from the sealing portion 22a to the illuminated region side, and the other end portion of the lead wire 28b extends from the sealing portion 22b to the back side. When a voltage is applied to the lead wires 28a and 28b, a potential difference is generated between the electrodes 24a and 24b, and a discharge is generated in the tube portion 21 to generate an arc image.

As shown in FIGS. 2A and 2B, the reflector 30 includes a reflecting portion 32 as a first reflecting portion and a base portion 34. The reflection part 32 and the base part 34 are integrally formed. 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 reflecting portion 32 has a shape that is approximately ¼ of an elliptic sphere obtained by rotating the ellipsoid about the illumination optical axis OC as the rotation center axis. More specifically, the reflection unit 32 has one half of the elliptic sphere in the direction along the illumination optical axis OC removed, and when the reflector 32 is cut along a predetermined plane S including the illumination optical axis OC, The end portion 30z on the side, that is, the side of the secondary mirror 40 with respect to the arc tube 20 is removed (see FIG. 2A). Therefore, the end of the reflecting portion 32 on the opening side (illuminated region side) has a substantially semicircular shape. The light source device 10 can be thinned by forming the reflecting portion 32 in such a shape.

The reflecting portion 32 has a reflecting surface 31 on the inner surface facing the arc tube 20. The reflecting surface 31 is a part of a spheroid having a first focal point and a second focal point on the illumination optical axis OC. 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 base portion 34 extends from the reflecting portion 32 to the back side along the sealing portion 22b. The base 34 has, for example, a shape in which approximately half of the substantially cylindrical shape extending along the illumination optical axis OC is removed from the secondary mirror 40 side. An adhesive C2 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 C2.

  The adhesive C2 is disposed on the surface of the sealing portion 22b at a position farther from the tube portion 21 than the end of the electrode 24b on the side connected to the metal foil 26b. That is, the adhesive C2 is disposed at a position that does not overlap the connection portion 25b to which the electrode 24b and the metal foil 26b are connected in a plan view when the sub mirror 40 side is viewed from the reflector 30 side. The adhesive C2 is, for example, a silica-based or alumina-based inorganic adhesive. As such an inorganic adhesive, for example, “SUMICERAM (registered trademark)” manufactured by Sumitomo Chemical Co., Ltd. can be used.

  The sub mirror 40 is disposed on the opposite side of the reflector 30 with the arc tube 20 interposed therebetween, that is, on the side where the end 30z of the reflector 30 is removed. The sub mirror 40 includes a reflection part 42 as a second reflection part and a fixing part 44. The reflection part 42 and the fixing part 44 are formed integrally. 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 portion 42 has a substantially hemispherical shape in which approximately half of the reflector 30 side in the direction substantially orthogonal to the illumination optical axis OC is deleted. The reflection part 42 is arrange | positioned so that the opposite side to the reflector 30 of the bulb part 21 may be covered. The reflecting portion 42 has a reflecting surface 41 on the inner surface side facing the tube portion 21. The reflection part 42 reflects light emitted from the tube part 21 toward the tube part 21 (reflection surface 31) on the reflection surface 41. Thereby, the light inject | emitted from the tube | bulb part 21 to the submirror 40 side can be used effectively as an illumination light beam. On the reflecting surface 41, 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 extends from the reflecting portion 42 along the sealing portion 22a to the illuminated area side. For example, the fixing portion 44 extends to the position of the end portion on the illuminated region side in the sealing portion 22a. The fixed portion 44 has a shape in which substantially half of the reflector 30 side is removed from the substantially cylindrical shape extending along the illumination optical axis OC. Therefore, even if the fixing portion 44 extends to the position of the end portion on the illuminated region side in the sealing portion 22a, the light reflected by the reflector 30 and directed toward the second focal position is not blocked by the fixing portion 44. . An adhesive C1 is filled between the fixed portion 44 and the sealing portion 22a, and the arc tube 20 and the sub mirror 40 are fixed to each other by the adhesive C1.

  The adhesive C1 is disposed on the surface of the sealing portion 22a at a position farther from the tube portion 21 than the end portion of the electrode 24a connected to the metal foil 26a. That is, the adhesive C1 is disposed at a position that does not overlap the connection portion 25a to which the electrode 24a and the metal foil 26a are connected in a plan view when the sub mirror 40 side is viewed from the reflector 30 side. As the adhesive C1, similarly to the adhesive C2, a silica-based or alumina-based inorganic adhesive can be used.

  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 the opposite side of the tube portion 21 from the reflector 30, and the light emitted from the arc tube 20 to the secondary mirror 40 side is reflected to the reflector 30 side. Since it can be returned and used effectively, a decrease in luminance due to the deletion of one side of the reflector 30 can be suppressed.

  Further, the fixing portion 44 of the secondary mirror 40 has a shape in which approximately half of the reflector 30 side is removed. Therefore, even if the fixing portion 44 is extended to the position of the end portion of the sealing portion 22a, the light emitted from the tube portion 21 and reflected by the reflector 30 is not blocked by the sub mirror 40. Thereby, the area | region which arrange | positions the adhesive agent C1 can be widened, and sticking force can be increased. Moreover, the freedom degree in the setting of the arrangement position of the adhesive C1 can be increased.

  By the way, the arc tube 20 generates heat when the tube portion 21 emits light. In the arc tube 20, the sealing portions 22a and 22b, the electrodes 24a and 24b, and the metal foils 26a and 26b are made of different materials, and thus have different thermal expansion coefficients. Therefore, in the portion where the electrode 24a and the metal foil 26a are sealed in the sealing portion 22a and the portion where the electrode 24b and the metal foil 26b are sealed in the sealing portion 22b, the thermal expansion thereof. Stress due to the difference in rate is generated in each.

  In particular, a portion that overlaps the connection portion 25a to which the electrode 24a and the metal foil 26a are fixed is subjected to a stronger load due to stress caused by the difference in thermal expansion coefficient between the sealing portion 22a, the electrode 24a, and the metal foil 26a. . Further, even in a portion overlapping the connecting portion 25b where the electrode 24b and the metal foil 26b are fixed, a stronger load is applied to the stress caused by the difference in thermal expansion coefficient between the sealing portion 22b, the electrode 24b, and the metal foil 26b. .

  On the other hand, in the portion where the adhesive C1 is disposed, the surface of the sealing portion 22a is covered with the adhesive C1, thereby preventing heat dissipation from the surface, and the coefficient of thermal expansion between the sealing portion 22a and the adhesive C1. Stress due to the difference occurs. Further, even in the portion where the adhesive C2 is disposed, the surface of the sealing portion 22b is covered with the adhesive C2, thereby preventing heat dissipation from the surface, and the coefficient of thermal expansion between the sealing portion 22b and the adhesive C2 is reduced. Stress due to the difference occurs.

  Therefore, if the adhesive C1 is disposed at a position where the adhesive C1 overlaps the connecting portion 25a in the sealing portion 22a in a plan view when the sub mirror 40 side is viewed from the reflector 30 side, heat radiation from the surface of the sealing portion 22a is performed. In addition to being disturbed, stresses resulting from differences in the thermal expansion coefficients of these different materials are applied. Further, when the adhesive C2 is disposed at a position overlapping the connecting portion 25b in the sealing portion 22b, heat dissipation from the surface of the sealing portion 22b is hindered and also caused by a difference in thermal expansion coefficient between these different materials. Stress is applied. If it does so, stress will concentrate on the position of the connection parts 25a and 25b, and a stronger load will be applied, and the fall of the intensity | strength of the arc_tube | light_emitting_tube 20 (sealing part 22a, 22b) will be caused.

  In the light source device 10 according to the first embodiment, the adhesives C1 and C2 are disposed on the surfaces of the sealing portions 22a and 22b at positions that do not overlap the connection portions 25a and 25b, respectively. In other words, the sealing portion 22a, the electrode 24a, the metal foil 26a, and the adhesive C1 are all arranged so as not to coexist in the same plane orthogonal to the direction along the illumination optical axis OC. The sealing portion 22b, the electrode 24b, the metal foil 26b, and the adhesive C2 are all arranged so as not to coexist in the same plane orthogonal to the direction along the illumination optical axis OC. For this reason, the heat dissipation in this part in each of the sealing parts 22a and 22b is not hindered, and the concentration of stress on this part can be avoided. Thereby, the fall of the intensity | strength of the arc_tube | light_emitting_tube 20 (sealing part 22a, 22b) is suppressed.

  The adhesives C1 and C2 overlap the portions where the metal foils 26a and 26b are sealed. However, since the metal foils 26a and 26b are extremely thin, the sealing portions 22a and 22b and the metal foil 26a , 26b, the influence of the stress due to the difference in the coefficient of thermal expansion is not so much a problem as compared with the position overlapping the connecting portions 25a, 25b.

  Further, in the configuration of the light source device described in Patent Document 1, the side opposite to the reflector (main reflecting mirror) in the direction along the illumination optical axis of the bulb portion (bulb portion) of the arc tube is the reflecting portion ( Covered with a reflective base). An adhesive is disposed between the sealing portion of the arc tube and the fixing portion (cylinder portion) of the secondary mirror at a position farther from the bulb portion than the terminal end of the electrode (electrode axis). That is, the entire circumference of the portion where the electrode is located in the sealing portion is covered with the secondary mirror, and the opposite side of the electrode from the tube portion is covered with the adhesive. Therefore, it is difficult for heat generated from the tube portion to be dissipated between the sealing portion and the secondary mirror, and there is a risk of increasing stress due to the difference in coefficient of thermal expansion between the electrode and the sealing portion. is there.

  On the other hand, in the light source device 10, the fixing part 44 of the secondary mirror 40 has a shape in which approximately half of the reflector 30 side is deleted, so that the fixing part of the secondary mirror is cylindrical. Thus, the heat generated from the tube portion 21 is not radiated between the sealing portion 22a and the fixing portion 44 and is easily radiated. Therefore, since thermal expansion at the position of the connecting portion 25a is suppressed, an increase in stress due to the difference in coefficient of thermal expansion is suppressed.

  Moreover, since the fixing | fixed part 44 is extended to the position of the to-be-illuminated area | region side part of the sealing part 22a, the range which can arrange | position the adhesive agent C1 can be widened. As a result, the adhesive C1 is disposed at a position farther from the bulb portion 21 that is a heat source, and the region where the adhesive C1 is disposed is widened to increase the fixing force between the arc tube 20 and the sub mirror 40. Can be made.

  Also in the sealing portion 22b, the base portion 34 of the reflector 30 has a shape in which approximately half of the secondary mirror 40 side is removed from the substantially cylindrical shape, so that the sealing portion 22b, the base portion 34, It is easy to dissipate heat even during the period. Therefore, thermal expansion at the position of the connecting portion 25b is also suppressed.

<Manufacturing method of light source device>
Next, a method for manufacturing the light source device will be described. In the method of manufacturing the light source device according to the first embodiment, the arc tube 20, the reflector 30, and the secondary mirror 40 are prepared in advance, the secondary mirror 40 is fixed to the arc tube 20, and the arc tube 20 is attached to the reflector 30. Stick. Here, a method of manufacturing the secondary mirror 40 will be described with reference to FIG. The arc tube 20 and the reflector 30 can be manufactured using a known manufacturing method.

  FIG. 3 is a diagram for explaining a method of manufacturing the secondary mirror according to the first embodiment. Specifically, FIG. 3A to FIG. 3F are diagrams showing each process in the manufacturing process of the secondary mirror, and a cross section corresponding to a cross section along the line AA ′ in FIG. FIG. In the actual process, a margin for cutting is generated, but the illustration is omitted in FIG.

(1. Tubular member preparation process)
First, as shown in FIG. 3A, a tubular member 50 is prepared. The inner diameter of the tubular member 50 is appropriately set according to the outer diameter of the sealing portion 22a of the arc tube 20, the gap between the sealing portion 22a and the fixing portion 44, and the like. As the material of the tubular member 50, hard glass or quartz glass can be used. Quartz glass is suitable as a material for the tubular member 50 because it has a low coefficient of thermal expansion and no internal strain remains, so that it does not need to be annealed.

  The axis 50ax is an axis that passes through the center of the cross section of the tubular member 50 and extends in the extending direction of the tubular member 50. Although there is no difference in appearance at this stage, for convenience, one member when the tubular member 50 is divided into two along a plane including the axis 50ax is 50a, and the other member is 50b. Here, the case where the secondary mirror 40 is manufactured from the member 50a will be described as an example, but the secondary mirror 40 may be manufactured in the same manner from the member 50b.

(2. Expansion part formation process)
Next, as shown in FIG. 3B, after the tubular member 50 is heated and placed in a mold (not shown), an internal pressure is applied with an inert gas. Then, the inflated portion 52 is formed by inflating so that a part of the inner surface shape of the tubular member 50 becomes a predetermined shape corresponding to the reflecting portion 42. As the inert gas, for example, argon gas or nitrogen gas can be suitably used. Thereby, the tubular member 50 has a configuration including the inflating portion 52 and a pair of tubular portions 51a and 51b connected to both sides of the inflating portion 52 on each of the member 50a side and the member 50b side.

(3. Cutting process)
(3-1. First cutting step)
Next, as shown in FIG. 3C, a cut X1 is made along a plane including the axis 50ax of the tubular member 50 using, for example, a slicer. Then, the tubular member 50 is divided into a member 50a and a member 50b. Thereby, members 50a and 50b having the inflating portion 52 and the pair of tubular portions 51a and 51b are obtained. From the next step, the member 50a is processed.

(3-2. Second cutting step)
Next, as shown in FIG. 3D, the tubular portion 51b is connected to the connecting portion between the expanding portion 52 and the tubular portion 51b of the member 50a from the side where the cut X1 is made in the first cutting step or the opposite side. A cut X2 is made in a direction substantially orthogonal to the extending direction. Then, the member 50a is cut at the position of the cut X2, and the tubular portion 51b is separated. Similarly, the notch X3 is cut at a predetermined position of the tubular portion 51a in the member 50a, and the portion outside the position of the notch X3 of the tubular portion 51a (the side away from the inflating portion 52) is separated. Thereby, as shown in FIG.3 (e), the base material 50c comprised by the expansion part 52 and the tubular part 54 is obtained. The base material 50 c is a base material for the secondary mirror 40. The inflating part 52 becomes the reflecting part 42 of the secondary mirror 40, and the tubular part 54 becomes the fixing part 44 of the secondary mirror 40.

  Here, the position where the cut X3 is made in the tubular portion 51a is such that the fixing portion 44 (tubular portion 54) extends to the position of the end portion of the sealing portion 22a of the arc tube 20 (see FIG. 2B). , And adjust appropriately according to the length of the sealing portion 22a. Thus, the length in the extending direction of the fixed portion 44 can be set to a desired length by adjusting the position where the cut X3 is made in the tubular portion 51a.

(4. Reflective layer forming step)
Next, as shown in FIG. 3F, a reflective layer is formed on the reflective surface 41 which is the inner surface of the expanding portion 52 (reflecting portion 42) of the substrate 50c. As the reflective layer, for example, a reflective layer made of a dielectric multilayer film of tantalum oxide (Ta ₂ O ₅ ) and silicon oxide (SiO ₂ ) can be suitably used. When the reflective layer forming step is completed, the secondary mirror 40 configured by the reflective portion 42 corresponding to the expanding portion 52 and the fixing portion 44 corresponding to the tubular portion 54 is completed.

  According to the method for manufacturing the secondary mirror according to the first embodiment, the tubular member 50 is set by appropriately setting the position and angle of the cut X1 in the first cutting step and the cuts X2, X3 in the second cutting step. Therefore, the secondary mirror 40 having a desired shape and size can be easily obtained.

  In the cutting process of the above-described method for manufacturing the secondary mirror, the second cutting process may be performed before the first cutting process. That is, after the expansion part forming step shown in FIG. 3B, the tubular member 50 is cut with the notches X2 and X3 shown in FIG. 3D to cut the tubular part 51b and the tubular part 51a. You may make it cut | divide into the member 50a and the member 50b by making the notch | incision X1 shown to c).

  After the secondary mirror 40 is completed, as shown in FIG. 2 (b), an adhesive C1 is disposed between the fixing portion 44 of the secondary mirror 40 and the sealing portion 22a. It sticks to. Further, the arc tube 20 is fixed to the reflector 30 by disposing the adhesive C <b> 2 between the base portion 34 of the reflector 30 and the sealing portion 22 b. At this time, the adhesives C1 and C2 are disposed at positions that do not overlap the connection portions 25a and 25b, respectively. Either the sub mirror 40 and the arc tube 20 or the arc tube 20 and the reflector 30 may be fixed first. Thus, the light source device 10 is completed.

  According to the configuration of the light source device 10 according to the first embodiment, the following effects are obtained.

  (1) In contrast to the reflector 30 having a shape in which approximately 1/2 of the secondary mirror 40 side is deleted, the secondary mirror 40 having a shape in which approximately 1/2 of the reflector 30 side is deleted is interposed between the arc tube 20. It is arranged to face each other. For this reason, compared with the structure of the light source device described in Patent Document 1, the light source device 10 is reduced in thickness while suppressing a decrease in luminance, and the heat generated from the arc tube 20 is less likely to be radiated and easily radiated. Thereby, since the thermal expansion in the part in which the connection parts 25a and 25b are located in sealing part 22a and 22b is suppressed, the increase in the stress resulting from the difference of these thermal expansion coefficients is suppressed.

  (2) Since the adhesives C1 and C2 are arranged at positions where they do not overlap with the connection parts 25a and 25b, the heat radiation at this part of the sealing parts 22a and 22b is not hindered by the adhesives C1 and C2, and Stress concentration due to the difference in thermal expansion coefficient between the sealing portions 22a and 22b, the electrodes 24a and 24b, and the metal foils 26a and 26b can be avoided.

  (3) Since the secondary mirror 40 does not block the reflected light from the reflector 30, the fixing portion 44 can be extended to the end of the sealing portion 22a. Thereby, the adhesive C1 can be arranged at a position further away from the bulb portion 21, or the area where the adhesive C1 is arranged can be widened to increase the fixing force between the arc tube 20 and the sub mirror 40. .

  Accordingly, it is possible to provide a highly reliable light source device 10 that is thin and has a reduced strength reduction of the arc tube 20 (sealing portions 22a and 22b), and a highly reliable projector 1000 including the light source device 10. When the projector 1000 is arranged in a so-called ceiling state, the positional relationship of each component in the direction of gravity is reversed, but substantially the same effect as in the stationary state can be obtained.

(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 differs from the light source device according to the first embodiment in the length of the fixing portion of the secondary mirror and the arrangement position of the adhesive, but the other configurations are substantially the same. is there.

  FIG. 4 is a diagram illustrating a schematic configuration of the light source device according to the second embodiment. Specifically, FIG. 4 is a cross-sectional view corresponding to a cross section taken along line A-A ′ in FIG. In addition, about the component which is common in 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The light source device 12 according to the second embodiment includes an arc tube 20, a reflector 30, a secondary mirror 40a, and adhesives C1 and C2. The adhesive C2 is located farther from the tube portion 21 than the end connected to the metal foil 26b of the electrode 24b and the end connected to the metal foil 26b of the lead wire 28b. It is arrange | positioned in the surface of the sealing part 22b in the position of the tube part 21 side rather than. That is, the adhesive C2 is located in a portion between the connecting portion 25b and the connecting portion 27b in the sealing portion 22b in a plan view when the sub mirror 40 side is viewed from the reflector 30 side.

  The sub mirror 40a has a reflecting portion 42 and a fixing portion 44a. The fixing portion 44a extends from the reflecting portion 42 along the sealing portion 22a to a position before the connecting portion 27a. The secondary mirror 40a is manufactured by the same method as the secondary mirror manufacturing method according to the first embodiment, but the position of the cut X3 in the second cutting step shown in FIG. Adjustment is made according to the position of the connecting portion 27a at 22a. Thereby, the length in the extending direction of the fixing portion 44a is set shorter than the length of the fixing portion 44 in the first embodiment.

  The adhesive C1 is located farther from the tube portion 21 than the end connected to the metal foil 26a of the electrode 24a, and the end connected to the metal foil 26a of the lead wire 28a. It is arranged on the surface of the sealing portion 22a at a position closer to the tube bulb 21. That is, the adhesive C1 is located at a portion between the connection portion 25a and the connection portion 27a in the sealing portion 22a in a plan view when the sub mirror 40 side is viewed from the reflector 30 side.

  In the connecting portion 27a, the metal foil 26a and the lead wire 28a are fixed in the sealing portion 22a, and also in the connecting portion 27b, the metal foil 26b and the lead wire 28b are fixed in the sealing portion 22b. Therefore, when a material different from the metal foils 26a and 26b, such as tungsten, is used as the material of the lead wires 28a and 28b, a stronger load is applied to the stress caused by the difference in the thermal expansion coefficient even in the portion overlapping the connection portions 27a and 27b. It takes.

  In the light source device 12 according to the second embodiment, the adhesive C1 is disposed on the surface of the sealing portion 22a at a position where it does not overlap not only the connection portion 25a but also the connection portion 27a, and the adhesive C2 is only the connection portion 25b. And is disposed on the surface of the sealing portion 22b at a position that does not overlap the connection portion 27b. For this reason, the heat radiation at these portions in the sealing portions 22a and 22b is not hindered by the adhesives C1 and C2, and concentration of stress on these portions can be avoided. Thereby, the fall of the intensity | strength of the arc_tube | light_emitting_tube 20 (sealing part 22a, 22b) is suppressed more.

  Note that the base 34 may be extended to a position on the back side of the connection portion 27b, and the adhesive C2 may be disposed on the back side of the connection portion 27b. Similarly, the fixing portion 44a may extend to the position of the end portion on the illuminated area side in the sealing portion 22a, and the adhesive C1 may be disposed closer to the illuminated area than the connection portion 27a. Even in such a configuration, the heat radiation at the connection portions 25a and 25b and the connection portions 27a and 27b in the sealing portions 22a and 22b is not hindered by the adhesives C1 and C2, and stress on these portions is not affected. Concentration is avoided.

(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 above embodiment in that the fixing portion of the secondary mirror is extended to the back side, but the other configurations are substantially the same. is there.

  FIG. 5 is a diagram illustrating a schematic configuration of a light source device according to the third embodiment. Specifically, FIG. 5 is a cross-sectional view corresponding to a cross section taken along line A-A ′ in FIG. 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.

  The light source device 14 according to the third embodiment includes an arc tube 20, a reflector 30, a secondary mirror 40a, and adhesives C1 and C2. In the light source device 14, the secondary mirror 40 a is arranged so that the fixed portion 44 a is located on the back side of the reflecting portion 42, that is, on the sealing portion 22 b side. Therefore, both the base 34 and the fixing portion 44a are located on the back side of the tube portion 21, and the adhesive C1 and the adhesive C2 are both disposed on the surface of the sealing portion 22b.

  The adhesive C1 is disposed between the connection portion 25b and the connection portion 27b in a plan view when the sub mirror 40 side is viewed from the reflector 30 side, and the adhesive C2 is further away from the tube portion 21 than the adhesive C1. It is arranged at the position. That is, the adhesive C1 and the adhesive C2 are both disposed at positions that do not overlap the connection portion 25b and do not overlap each other.

  Therefore, in the light source device 14 according to the third embodiment, the stress caused by the difference in the thermal expansion coefficient between the sealing portion 22b and the adhesive C1 and the difference in the thermal expansion coefficient between the sealing portion 22b and the adhesive C2. It can be avoided that the stress caused by is concentrated on the same portion of the sealing portion 22b, and none of these stresses are concentrated on the portion of the connecting portion 25b. In addition, a decrease in heat dissipation due to the adhesive C1 and the adhesive C2 being disposed at positions where they overlap each other can be avoided. Thereby, even if adhesive C1 and C2 are both arrange | positioned on the surface of the sealing part 22b, the fall of the intensity | strength of the arc_tube | light_emitting tube 20 (sealing part 22b) can be suppressed.

(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 that the reflector has a cylindrical portion connected to the base, but the other configurations are as follows. It is almost the same.

  FIG. 6 is a diagram illustrating a schematic configuration of a light source device according to the fourth embodiment. Specifically, FIG. 6 is a cross-sectional view corresponding to a cross section taken along line A-A ′ in FIG. 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.

  The light source device 16 according to the fourth embodiment includes an arc tube 20, a reflector 30a, a sub mirror 40a, and adhesives C1 and C2. The reflector 30 a has a reflecting portion 32, a base portion 34, and a cylindrical portion 36. The cylindrical portion 36 is connected to the back side of the base portion 34. In other words, the reflecting portion 32 and the cylindrical portion 36 are connected by the base portion 34. The cylindrical part 36 is arranged at a position farther from the tube part 21 than the metal foil 26b, that is, on the back side of the connecting part 27b, and covers the entire circumference of the outer periphery of the sealing part 22b. The adhesive C2 is disposed between the sealing portion 22b and the cylindrical portion 36.

  In the light source device 16 according to the fourth embodiment, the adhesive C1 is disposed between the connection portion 25b and the connection portion 27b, and the adhesive C2 is disposed on the back side of the connection portion 27b. That is, the adhesive C1 and the adhesive C2 are both arranged at positions that do not overlap with both the connection portion 25b and the connection portion 27b and do not overlap each other.

  Therefore, the stress due to the difference in thermal expansion coefficient between the sealing portion 22b and the adhesive C1 and the stress due to the difference in thermal expansion coefficient between the sealing portion 22b and the adhesive C2 are the same in the sealing portion 22b. Concentration on the connection portion 25b and the connection portion 27b is not concentrated on any of these stresses. Thereby, the fall of the intensity | strength of the arc_tube | light_emitting_tube 20 (sealing part 22b) can be suppressed more.

  Further, since the adhesive C2 is disposed between the cylindrical portion 36 over the entire outer periphery of the sealing portion 22b, the arc tube 20 and the reflector 30a are more securely fixed as compared with the above embodiment. can do.

  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 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 2)
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 3)
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 4)
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 5)
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 6)
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, 21 ... Tube part, 22a, 22b ... A pair of sealing part, 24a, 24b ... A pair of electrode, 26a, 26b ... As a pair of conductor foil Metal foil, 28a, 28b ... a pair of lead wires, 30, 30a ... reflector, 32 ... reflection part as the first reflection part, 34 ... base part, 40, 40a ... sub mirror, 42 ... as the second reflection part Reflecting portion, 44, 44a ... fixing portion, 100 ... illuminating device, 400R, 400G, 400B ... liquid crystal device as electro-optic modulation device, 600 ... projection lens, 1000 ... projector, C1 ... adhesive as first adhesive , C2 ... Adhesive as a second adhesive, OC ... Illumination optical axis.

Claims (7)

A tube portion, a pair of sealing portions extending along the illumination optical axis on both sides of the tube portion, a pair of conductive foils respectively sealed in the pair of sealing portions, and one end portions An arc tube having a pair of electrodes enclosed in the tube portion so that they face each other and having the other end electrically connected to the tube portion side of the pair of conductor foils,
A reflector having a shape in which one side is deleted when cut at a predetermined plane, and having a first reflecting portion that reflects light emitted from the tube portion toward the illuminated region;
The arc tube is disposed on the opposite side of the reflector with the arc tube interposed therebetween, a second reflecting portion disposed opposite to the bulb portion, and the pair of sealing portions from the second reflecting portion. A secondary mirror having a fixed portion extending along one side;
A first adhesive disposed between the one sealing portion and the fixing portion and fixing the arc tube and the secondary mirror;
The light source device, wherein the first adhesive is arranged at a position farther from the tube portion than the other end portion of the electrode on the one sealing portion side. The light source device according to claim 1,
Further comprising a pair of lead wires each having one end electrically connected to the opposite side of the pair of conductor foils to the side to which the pair of electrodes are connected,
The first adhesive is disposed in the one sealing portion at a position closer to the tube portion than the one end portion of the lead wire, or at a position farther from the tube portion than the conductor foil. A light source device. The light source device according to claim 1 or 2,
The light source device, wherein the fixing portion of the sub mirror extends to a position of an end portion of the one sealing portion. The light source device according to any one of claims 1 to 3,
The reflector has a base portion that extends from the first reflecting portion along one of the pair of sealing portions,
A second adhesive disposed between the one sealing portion and the base and fixing the arc tube and the reflector;
The light source device, wherein the second adhesive is disposed at a position farther from the bulb portion than the other end portion of the electrode in the one sealing portion. The light source device according to claim 4,
The second adhesive is disposed in the one sealing portion where the first adhesive is disposed,
Either one of the first adhesive and the second adhesive is disposed at a position farther from the tube part than the other. The light source device according to claim 5,
The first adhesive is disposed at a position closer to the tube portion than the one end of the lead wire,
The light source device, wherein the second adhesive is arranged at a position farther from the tube portion than the conductor foil. An illumination device comprising the light source device according to any one of claims 1 to 6,
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