JP2009176456A - Light source device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of improving light utilization efficiency while attaining miniaturization of the device. <P>SOLUTION: The light source device 110 includes an ellipsoid reflector 10 having a reflecting surface formed of an ellipsoid; an arc tube 20 having a tubular bulb part 30 having the light emission center near a first focus F<SB>1</SB>of the ellipsoid reflector 10 and containing a pair of electrodes arranged along an illumination light axis 100ax, and a pair of sealing parts 40, 50 extending on both sides of the tubular bulb part 30; and a secondary mirror 60 disposed at the sealing part 50 and having an inner reflecting surface 62 reflecting light from the tubular bulb part 30 toward the illuminated area side, and an outer reflecting surface 64 reflecting light reflected by a reflecting surface 14 of the ellipsoid reflector 10, toward the ellipsoid reflector 10. Each of the inner reflecting surface 62 and the outer reflecting surface 64 is composed of an ellipsoid having a first focus F<SB>1</SB>and a second focus F<SB>2</SB>coinciding with the first focus F<SB>1</SB>and a second focus F<SB>2</SB>of the ellipsoid reflector 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  2. Description of the Related Art Conventionally, as a light source device used for a projector, a light source device including a main mirror having an elliptical reflecting surface is known (see, for example, Patent Document 1). According to the conventional light source device, since the main mirror having the ellipsoidal reflecting surface is provided, the luminance is reduced while downsizing the device as compared with the light source device having the main mirror having the parabolic reflecting surface. It becomes possible to make it higher.

  Further, as another conventional light source device, a light source device including a secondary mirror is known (see, for example, Patent Document 2). According to another conventional light source device, light that is not collected by the primary mirror among the light emitted from the arc tube (tube part) is reflected toward the illuminated area by the secondary mirror, and thus is essentially effective. It is possible to effectively use the light that has not been used for the light. Further, it is not necessary to set the size of the primary mirror so as to cover the end of the light emitting tube on the illuminated area side, so that the primary mirror can be downsized and the projector can be downsized.

  Thus, it can be said that the light source device in which the primary mirror having the reflecting surface made of an ellipsoid and the above-described secondary mirror is combined is a light source device capable of improving the light utilization efficiency while reducing the size of the device. .

JP 2002-350778 A JP 2001-125197 A

  By the way, with the recent increase in brightness of projectors, there is a demand for further improving the light utilization efficiency of the light source device.

  Therefore, the present invention has been made in view of such circumstances, and an object of the present invention is to provide a light source device and a projector capable of improving the light utilization efficiency as compared with the related art while reducing the size of the device. To do.

  A light source device of the present invention includes a main mirror having an elliptical reflecting surface, and a tube containing a pair of electrodes having a light emission center near the first focal point of the main mirror and arranged along the illumination optical axis. A light emitting tube having a bulb portion and a pair of sealing portions extending on both sides of the tube portion, and a sealing portion opposite to the side where the primary mirror is arranged in the pair of sealing portions. A secondary mirror having an inner reflective surface that reflects light from the bulb portion toward the illuminated area and an outer reflective surface that reflects light reflected by the reflective surface of the primary mirror toward the primary mirror Each of the inner reflecting surface and the outer reflecting surface comprises an elliptical surface having a first focal point and a second focal point that coincide with the first focal point and the second focal point of the main mirror.

  For this reason, according to the light source device of the present invention, since the primary mirror having the reflecting surface made of an ellipsoid is provided, the device is smaller than the light source device having the primary mirror having the reflecting surface made of a paraboloid. It is possible to increase the luminance while reducing the brightness.

  Further, according to the light source device of the present invention, the light that is not collected by the primary mirror among the light emitted from the tube part is reflected toward the illuminated area by the inner reflective surface of the secondary mirror. Light that has not been used effectively can also be used effectively. In addition, since it is not necessary to set the size of the primary mirror so as to cover the end of the arc tube on the illuminated area side, it is possible to reduce the size of the primary mirror.

  By the way, the inventor of the present invention thoroughly investigated factors that hinder the improvement of light utilization efficiency in another conventional light source device (a light source device including a secondary mirror that does not have an outer reflecting surface). As a result, the inventors have found that the cause is that part of the light reflected by the reflecting surface of the primary mirror is blocked by the outer surface of the secondary mirror (the surface facing the primary mirror). That is, in another conventional light source device, as can be seen from FIG. 5 described later, a part of the light reflected by the reflecting surface of the primary mirror is blocked by the outer surface of the secondary mirror (the surface facing the primary mirror). Yes. The light blocked by the outer surface of the secondary mirror in this way cannot be used effectively because it is absorbed by the base material that constitutes the secondary mirror or is emitted outside the system due to undesirable reflections. The efficiency cannot be improved.

  On the other hand, according to the light source device of the present invention, the outer surface of the secondary mirror (the surface facing the primary mirror) has an outer reflective surface that reflects the light reflected by the reflective surface of the primary mirror toward the primary mirror. Since it is formed, it is possible to suppress the light incident on the outer surface of the secondary mirror from being absorbed by the base material constituting the secondary mirror or being emitted outside the system due to undesirable reflection. In addition, since the reflection surface of the primary mirror and the external reflection surface of the secondary mirror are configured such that the first focal point and the secondary focal point coincide with each other, the light reflected by the external reflective surface of the secondary mirror is After being reflected by the reflecting surface, the light is condensed toward the second focal point of the primary mirror. That is, according to the light source device of the present invention, the light reflected by the outer reflecting surface of the secondary mirror is effectively used unlike the light blocked by the outer surface of the secondary mirror in the conventional case. The light utilization efficiency can be improved as compared with the conventional case.

  Therefore, the light source device of the present invention is a light source device capable of improving the light utilization efficiency as compared with the conventional one while reducing the size of the device.

  In the light source device of the present invention, the secondary mirror side fixing part fixed to the vicinity of the opening end surface of the secondary mirror opposite to the primary mirror, and the sealing part side fixing part fixed to the sealing part are provided. It is preferable to further include a transparent auxiliary mirror fixing member.

  With this configuration, the secondary mirror can be fixed to the arc tube. In addition, since the secondary mirror fixing member is transparent, the light reflected by the inner reflection surface of the secondary mirror can be passed, and the light reflected by the inner reflection surface of the secondary mirror can be used effectively. Become.

  In the light source device of the present invention, the secondary mirror fixing member is formed of a rotationally symmetric body with the illumination optical axis as an axis, and a through hole that penetrates the sealing portion at a substantially central position of the secondary mirror fixing member. Is preferably formed.

  With this configuration, the secondary mirror can be fixed to the arc tube relatively easily. Further, since the contact area between the secondary mirror and the secondary mirror fixing member and the contact area between the sealing portion and the secondary mirror fixing member are relatively large, the secondary mirror can be securely fixed to the arc tube.

  In the light source device according to the aspect of the invention, it is preferable that the sub mirror fixing member further has an opening above the gravity when viewed along the illumination optical axis.

  By the way, in a light source device including an arc tube, when the arc tube is turned on, in general, the temperature at the upper apex portion tends to be particularly high with respect to the gravity in the bulb portion, and the tolerance of the base material constituting the bulb portion is allowed. When the temperature is exceeded, local swelling may occur or whitening may occur at the upper apex portion of the tube portion. Whitening is a phenomenon in which the base material constituting the tube portion becomes clouded and devitrified. When local swelling occurs in the bulb portion, the arc tube may rupture due to a decrease in strength. Further, when the tube portion is whitened, the light transmission is hindered at the whitened portion, and as a result, heat is generated and the temperature of the arc tube further rises. As a result, the arc tube may burst. .

  In order to suppress the temperature rise of the upper apex portion in the tube portion, it is conceivable to cool the arc tube with a cooling fan when the projector is used. However, since the temperature difference between the upper apex portion and the lower apex portion in the tube portion is large, when the temperature of the upper apex portion in the tube portion is cooled to a predetermined temperature or lower, the lower portion in the tube portion May be cooled more than necessary, and the lower apex portion of the tube may be blackened. Blackening is a phenomenon in which the halogen cycle is not smoothly performed due to the temperature becoming too low in the tube portion, and tungsten evaporated from the electrode adheres to the inner wall of the tube portion. When the tube portion is blackened in this way, light is absorbed at the blackened portion, so that the light amount of the arc tube may be reduced or the arc tube may be damaged.

  As described above, in the light source device including the arc tube, the temperature of the upper apex portion in the tube portion is likely to be high, and the temperature difference between the upper apex portion and the lower apex portion in the tube portion is large. As a result, there is a problem that it is not easy to extend the life of the arc tube.

On the other hand, according to the light source device of the present invention, since the opening is formed above the illumination optical axis in the secondary mirror fixing member, the secondary mirror fixing member becomes an obstacle when cooling the bulb portion. Therefore, it is possible to cool the upper apex portion of the tube portion well. Thereby, it becomes possible to suppress the temperature rise of the upper apex part in a tube part.
Further, according to the light source device of the present invention, since the region including the lower apex portion in the bulb portion is covered with the secondary mirror and the secondary mirror fixing member, the arc tube is cooled by the cooling fan. It is possible to keep the lower apex portion of the tube portion warm. This makes it possible to reduce the temperature difference between the upper apex portion and the lower apex portion in the tube portion, so that the temperature of the upper apex portion in the tube portion is cooled to a predetermined temperature or less. Even if it exists, it becomes possible to suppress that the lower vertex part in a bulb part will be cooled more than necessary. As a result, it is possible to suppress a decrease in the light amount of the arc tube and damage to the arc tube due to blackening. Therefore, the light source device of the present invention is a light source device capable of extending the lifetime of the arc tube. Become.

  In the light source device of the present invention, the secondary mirror side fixing portion fixed to the vicinity of the primary mirror side opening end surface of the secondary mirror, the sealing portion side fixing portion fixed to the sealing portion, and the tube A secondary mirror fixing member having a plurality of connecting parts connecting the secondary mirror side fixing part and the sealing part side fixing part so as to cover a part of the outer surface of the part, and the tube in the plurality of connecting parts It is preferable that a reflective surface for reflecting light from the tube bulb portion toward the tube bulb portion is formed on the surface facing the bulb portion.

Also with this configuration, it is possible to securely fix the secondary mirror to the arc tube.
In addition, since the reflection surface is formed on the surface of the plurality of connecting portions that faces the tube portion, there are a plurality of connecting portions in the light emitted from the tube portion toward the illuminated area. The light incident on the portion to be reflected is reflected toward the tube bulb by the reflecting surfaces formed at the plurality of connecting portions, and after passing through the tube bulb, is collected at the second focal point of the primary mirror by the reflecting surface of the primary mirror. It will be reflected like light. On the other hand, light incident on a portion where a plurality of connecting portions do not exist among light emitted from the tube portion toward the illuminated region side (light passing between the plurality of connecting portions) is reflected on the inner reflection surface of the sub-mirror. Thus, the light is reflected so as to be condensed at the second focal point of the primary mirror. That is, according to the light source device of the present invention, the light emitted from the tube portion toward the illuminated area can be used without any surplus, and thus the light source capable of further improving the light utilization efficiency. It becomes a device.

  In the light source device of the present invention, the opening formed between the two adjacent connecting portions has a total opening area above the opening with respect to gravity when viewed along the illumination optical axis, It is preferable to be configured so as to be larger than the total opening area of the opening below the gravity when viewed along the illumination optical axis.

By comprising in this way, it becomes possible to cool the upper vertex part in a tube bulb part favorably, and it becomes possible to suppress the temperature rise of the upper vertex part in a tube bulb part. In addition, when the arc tube is cooled by a cooling fan, it is possible to keep the lower apex portion of the bulb portion warm, so the temperature difference between the upper apex portion and the lower apex portion of the bulb portion Even when the temperature of the upper apex portion in the tube portion is cooled to a predetermined temperature or less, the lower apex portion in the tube portion is cooled more than necessary. It becomes possible to suppress. As a result, it is possible to suppress a decrease in the light amount of the arc tube and damage to the arc tube due to blackening. Therefore, the light source device of the present invention is a light source device capable of extending the lifetime of the arc tube. Become.

  A projector according to the present invention includes a light source device according to the present invention, an electro-optic modulation device that modulates an illumination light beam from the light source device according to image information, and a projection optical system that projects light modulated by the electro-optic modulation device. It is characterized by providing.

  For this reason, the projector of the present invention includes a light source device capable of improving the light utilization efficiency as compared with the conventional light source device while reducing the size of the device, so that the projector is small and has high brightness.

  Hereinafter, a light source device and a projector according to the present invention will be described based on embodiments shown in the drawings.

[Embodiment 1]
First, configurations of the light source device 110 and the projector 1000 according to the first embodiment will be described with reference to FIGS.
FIG. 1 is a diagram for explaining the light source device 110 and the projector 1000 according to the first embodiment. FIG. 1A is a diagram illustrating an optical system of the projector 1000, and FIG. 1B is a side view illustrating the light source device 110. FIG.
FIG. 2 is a view for explaining the secondary mirror 60 and the secondary mirror fixing member 70A. 2A is a perspective view showing a state in which the secondary mirror 60 and the secondary mirror fixing member 70A are attached to the sealing portion 50 of the arc tube 20, and FIG. 2B is a perspective view of the secondary mirror 60 and the secondary mirror fixing member 70A. 2 (c) is an exploded perspective view of the secondary mirror 60 and the secondary mirror fixing member 70A when viewed from a direction different from that in FIG. 2 (b).
FIG. 3 is a diagram for explaining the light source device 110 according to the first embodiment.

  In the following description, the three directions orthogonal to each other are defined as the z-axis direction (illumination optical axis 100ax direction in FIG. 1A) and the x-axis direction (parallel to the paper surface in FIG. And a direction perpendicular to the paper surface in FIG. 1A and perpendicular to the z-axis.

  As shown in FIG. 1A, the projector 1000 according to the first embodiment is illuminated by separating the illumination device 100 and the illumination light flux from the illumination device 100 into three color lights of red light, green light, and blue light. A color separation light guide optical system 200 that guides light to a region, and three liquid crystal light modulation devices 400R, 400G, and 400B that modulate each of the three color lights separated by the color separation light guide optical system 200 according to image information; A cross dichroic prism 500 that combines the color lights modulated by the three liquid crystal light modulation devices 400R, 400G, and 400B, and a projection optical system 600 that projects the light combined by the cross dichroic prism 500 onto a projection surface such as a screen SCR. It is a projector provided with.

  The illuminating device 100 includes a light source device 110 that emits an illumination light beam toward the illuminated region, a concave lens 90, and a plurality of first small lenses 122 that divide the illumination light beam emitted from the concave lens 90 into a plurality of partial light beams. The first lens array 120, the second lens array 130 having a plurality of second small lenses 132 corresponding to the plurality of first small lenses 122 of the first lens array 120, and each partial light beam from the second lens array 130. Conversion element 140 that converts the light into substantially one type of linearly polarized light having a uniform polarization direction and emits the light, and a superimposing lens 150 that superimposes the partial light beams emitted from the polarization conversion element 140 in the illuminated area. .

The light source device 110, as shown in FIG. 1 (b), an ellipsoidal reflector 10 as the primary mirror, the arc tube 20 having an emission center to the focus F ₁ near the ellipsoidal reflector 10, a sub mirror 60 And a sub mirror fixing member 70A for fixing the sub mirror 60 to the arc tube 20. The light source device 110 emits a light beam having the illumination optical axis 100ax as a central axis.

  The arc tube 20 includes a tube bulb portion 30 containing a pair of electrodes 42 and 52 arranged along the illumination optical axis 100ax, a pair of sealing portions 40 and 50 extending on both sides of the tube bulb portion 30, and a pair of A pair of metal foils 44 and 54 sealed in the sealing portions 40 and 50, respectively, and a pair of lead wires 46 and 56 electrically connected to the pair of metal foils 44 and 54, respectively. When a voltage is applied to the lead wires 46 and 56, a potential difference is generated between the electrodes 42 and 52, a discharge is generated, and an arc image is generated.

If the conditions of the constituent elements of the arc tube 20 are exemplarily shown, the tube portion 30 and the sealing portions 40 and 50 are made of, for example, quartz glass, and mercury or a rare gas is contained in the tube portion 30. And a small amount of halogen is enclosed. The electrodes 42 and 52 are, for example, tungsten electrodes, and the metal foils 44, 54 are, for example, molybdenum foils. The lead wires 46 and 56 are made of, for example, molybdenum or tungsten.
Further, 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 ellipsoidal reflector 10 includes a neck-shaped fixing portion 12 for inserting and fixing the sealing portion (one sealing portion) 40 of the arc tube 20 and light emitted from the arc tube 20 (light L _{1 in} FIG. 3). see.) to have a reflection surface 14 for reflecting the second focal point F _2. The reflecting surface 14 consists of elliptical surface having a first focal point _{F 1} and a second focal point _{F 2.} The ellipsoidal reflector 10 is fixed to the sealing portion 40 of the arc tube 20 with an inorganic adhesive such as cement filled in the neck-shaped fixing portion 12 of the ellipsoidal reflector 10, although the illustration is omitted.

For example, crystallized glass, alumina (Al ₂ O ₃ ), or the like can be suitably used as the material of the base material constituting the ellipsoidal reflector 10. On the surface of the reflecting surface 14, 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. 1 to 3, the secondary mirror 60 includes an inner reflection surface 62 that reflects light from the tube portion 30 (see the light L < _b > _{2 in} FIG. 3) toward the illuminated area, and an elliptical surface. and outer reflecting surface 64 for reflecting the ellipsoidal reflector 10 and the light reflected by the reflecting surface 14 (see light L ₃ of Figure 3.) of the reflector 10, the open end face 66 of the ellipsoidal reflector 10, ellipsoidal It has an opening end face 68 on the opposite side (illuminated area side) from the reflector 10. The secondary mirror 60 is disposed on the sealing portion (the other sealing portion) 50 of the arc tube 20 by a secondary mirror fixing member 70A described later. The inner reflecting surface 62 and the outer reflecting surface 64 are composed of ellipsoidal surfaces having a first focal point F ₁ and a second focal point F ₂ that coincide with the first focal point F ₁ and the second focal point F ₂ of the elliptical reflector 10.
In this specification, “the first focal point F ₁ and the second focal point F ₂ coincide” is not only the case where the first focal point F ₁ and the second focal point F ₂ completely coincide, but also the first focal point F 1. It is used in the meaning including the case where the _first and second focal points F ₂ substantially coincide.

The first focal point F ₁ and the second focal point F ₂ of the reflecting surface 14 of the ellipsoidal reflector 10 coincide with the first focal point F ₁ and the second focal point F ₂ of the inner reflecting surface 62 and the outer reflecting surface 64 of the secondary mirror 60. and for which, as shown in FIG. 3, (light from the first focal point F ₁₎ light emitted from the light emitting tube 20, the inner reflecting surface 62 and the outer reflecting surface 14 and the sub mirror 60 of the ellipsoidal reflector 10 even if they are reflected by any of the reflecting surface of the reflecting surface 64, so that the condensing light toward the second focal point F _2. This principle will be described in more detail with reference to FIG.

FIG. 4 is a conceptual diagram for explaining the principle that the light from the first focal point F ₁ is reflected by the respective reflecting surfaces and collected at the second focal point F ₂ . In FIG. 4, an ellipse E ₁ indicated by a solid line indicates an ellipse drawn from the reflection surface 14 of the ellipsoidal reflector 10, and an ellipse E ₂ indicated by a broken line indicates an inner reflection surface 62 and an outer reflection surface 64 of the secondary mirror 60. An ellipse drawn from is shown. Further, the ellipse E ₁ and the ellipse E ₂ have the same first focus F ₁ and second focus F ₂ .

As shown in FIG. 4, the light directed from the focus _{F 1} of the ellipsoidal _{E 1} to the point _{P 1} on an elliptic _{E 1} is condensed at the second focal point _{F 2.} Light directed from the focus _{F 1} of the ellipsoidal _{E 1} to the point _{P 2} on the elliptic _{E 1} also focused on the second focal point _{F 2.} That is, light emitted from the arc tube 20 (light from the first focal point F ₁₎ is reflected by the reflecting surface 14 of the ellipsoidal reflector 10, so that the condensing light toward the second focal point F _2.

The light directed from the focus _{F 1} of the ellipsoidal _{E 2} to the point _{P 3} on the elliptic _{E 2} is condensed to the second focal point _{F 2.} That is, light emitted from the arc tube 20 (light from the first focal point F ₁₎ is reflected by the inner reflecting surface 62 of the secondary mirror 60, so that the condensing light toward the second focal point F _2.

The light directed from the focus F ₁ of the ellipsoidal E ₂ to the point P ₁ on an elliptic E _1, when it is reflected at a point P ₃ on the elliptic E _2, as is apparent from FIG. 4, always elliptically and thus directed to a point _{P 2} on E _1. Light directed from the point _{P 3} to the point _{P 2} is condensed to the second focal point _{F 2.} That is, the light emitted from the arc tube 20 (light from the first focal point F ₁₎ is reflected by the outer reflecting surface 64 of the secondary mirror 60, is further reflected by the reflecting surface 14 of the ellipsoidal reflector 10, the 2 so that the condensing light toward the focal point F _2.

Thus, the light emitted from the arc tube 20 (the light from the first focal point F ₁ ) is reflected by any of the reflection surface 14 of the ellipsoidal reflector 10 and the inner reflection surface 62 and the outer reflection surface 64 of the secondary mirror 60. even if they are reflected by the surface, so that the condensing light toward the second focal point F _2.

  As shown in FIG. 2, the secondary mirror fixing member 70 </ b> A is made of a donut-shaped transparent plate (e.g., a glass plate), and is attached to the secondary mirror side fixing portion 72 </ b> A fixed to the opening end surface 68 and the sealing portion 50. A sealing portion side fixing portion 74A to be fixed and a through hole 76A that is formed at a substantially central position of the secondary mirror fixing member 70A and penetrates the sealing portion 50 are included. As shown in FIG. 2C, the secondary mirror side fixing portion 72A is located on the outer peripheral portion of the surface of the secondary mirror fixing member 70A on the secondary mirror 60 side. The secondary mirror 60 and the secondary mirror fixing member 70A are bonded and fixed by an adhesive (not shown) applied to the secondary mirror side fixing portion 72A. The secondary mirror fixing member 70A and the sealing portion 50 are bonded and fixed by an adhesive (not shown) applied to the sealing portion-side fixing portion 74A.

  The concave lens 90 is disposed on the illuminated area side of the ellipsoidal reflector 10 as shown in FIG. The light from the ellipsoidal reflector 10 is emitted toward the first lens array 120.

  The first lens array 120 has a function as a light beam splitting optical element that splits light from the concave lens 90 into a plurality of partial light beams, and a plurality of first small lenses 122 are provided in a plane orthogonal to the illumination optical axis 100ax. It has a configuration arranged in a matrix of rows and columns. Although the description by illustration is omitted, the outer shape of the first small lens 122 is similar to the outer shape of an image forming area of a liquid crystal panel described later.

  The second lens array 130 has a function of forming an image of each first small lens 122 of the first lens array 120 in the vicinity of the image forming area of the liquid crystal panel together with the superimposing lens 150. The second lens array 130 has substantially the same configuration as the first lens array 120, and a plurality of second small lenses 132 are arranged in a matrix of a plurality of rows and a plurality of columns in a plane orthogonal to the illumination optical axis 100ax. Have a configuration.

The polarization conversion element 140 is a polarization conversion element that emits the polarization direction of each partial light beam divided by the first lens array 120 as approximately one type of linearly polarized light having a uniform polarization direction.
The polarization conversion element 140 transmits light having one polarization component (for example, P polarization component) out of the illumination light flux from the light source device 110 and light having the other polarization component (for example, S polarization component) to the illumination optical axis 100ax. A polarization separation layer that reflects in the vertical direction, a reflection layer that reflects light having the other polarization component reflected by the polarization separation layer in a direction parallel to the illumination optical axis 100ax, and one polarization that has passed through the polarization separation layer And a phase difference plate that converts light having a component into light having the other polarization component.

  The superimposing lens 150 is an optical element for condensing a plurality of partial light beams that have passed through the first lens array 120, the second lens array 130, and the polarization conversion element 140 and superimposing them on the vicinity of the image forming area of the liquid crystal panel. The superimposing lens 150 is arranged so that the optical axis of the superimposing lens 150 and the illumination optical axis 100ax of the illumination device 100 substantially coincide. The superimposing lens 150 may be composed of a compound lens in which a plurality of lenses are combined.

  The color separation 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 optical system 200 separates the illumination light beam emitted from the superimposing lens 150 into three color lights of red light, green light, and blue light, and the three liquid crystal light modulation devices 400R that are the illumination targets. , 400G, 400B.

  The dichroic mirrors 210 and 220 are optical elements in 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 reflected by the reflection mirror 230 and enters the liquid crystal light modulation device 400R for red light via 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 other condenser lenses 300G and 300B are configured in the same manner as the condenser 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 liquid crystal light modulation device 400G for green light. On the other hand, the blue light component is transmitted through the dichroic mirror 220, passes through the incident side lens 260, the incident side reflection mirror 240, the relay lens 270, the emission side reflection mirror 250, and the condensing lens 300B, and is a liquid crystal for blue light. The light enters the light modulation 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 light modulation device 400B.

The liquid crystal light modulation devices 400R, 400G, and 400B modulate the illumination light beam according to the image information, and are the illumination target of the illumination device 100.
The liquid crystal light modulators 400R, 400G, and 400B are not illustrated here, but are disposed on the liquid crystal panel, the incident-side polarizing plate disposed on the light incident side of the liquid crystal panel, and the light exit side of the liquid crystal panel. And an exit-side polarizing plate that transmits light having a polarization axis orthogonal to the polarization axis of light transmitted through the incident-side polarizing plate.

  The liquid crystal panel is a TN type liquid crystal panel in which a liquid crystal as an electro-optical material is hermetically sealed in a pair of transparent glass substrates (a counter substrate and a TFT substrate). For example, using a polysilicon TFT as a switching element, the polarization direction of one type of linearly polarized light emitted from the incident side polarizing plate is modulated in accordance with given image information.

  Light modulation of each color light incident is performed by the incident side polarizing plate, the liquid crystal panel, and the exit side polarizing plate.

  The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the exit 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 blue light, and the dielectric multilayer film formed at the other interface reflects red light. By these dielectric multilayer films, the blue light and the red light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form a large screen image on the screen SCR.

  According to the light source device 110 according to the first embodiment configured as described above, since the ellipsoidal reflector 10 having the ellipsoidal reflecting surface 14 is provided, the main mirror having a parabolic reflecting surface ( Compared with a light source device provided with a so-called parabolic reflector, it is possible to increase the luminance while reducing the size of the device.

Further, embodiments according to the light source apparatus 110 according to Embodiment 1, light (e.g., see the light L ₂ in FIG. 3.) Which is not condensed by the ellipsoidal reflector 10 of the light emitted from the tube spherical portion 30, the secondary mirror Since the light is reflected toward the illuminated area by the inner reflection surface 62, light that has not been effectively used can be used effectively. Further, since it is not necessary to set the size of the ellipsoidal reflector 10 so as to cover the end of the arc tube 20 to be illuminated, it is possible to reduce the size of the ellipsoidal reflector.

  Here, in describing the light source device 110 according to the first embodiment in more detail, the light source device 110a according to the comparative example of the first embodiment will be described.

  FIG. 5 is a diagram for explaining a light source device 110a according to a comparative example. FIG. 5A is a side view for explaining the light source device 110a, and FIG. 5B is an enlarged view showing the state of light blocked by the outer surface 64a of the secondary mirror 60a. 5A, the same members as those in FIG. 1B are denoted by the same reference numerals, and detailed description thereof is omitted.

  The light source device 110a according to the comparative example basically has a configuration similar to that of the light source device 110 according to the first embodiment, except that the secondary mirror does not have an outer reflection surface and a secondary mirror fixing member. It is different from the light source device 110 according to the first embodiment in that there is no point.

  In the light source device 110a according to the comparative example, as shown in FIG. 5A, a part of the light reflected by the reflecting surface 14 of the ellipsoidal reflector 10 (see the light La) is transmitted from the outer surface 64a of the secondary mirror 60a. It is blocked. The light La blocked by the outer surface 64a of the secondary mirror 60a in this way is absorbed by the base material constituting the secondary mirror 60a or emitted outside the system by undesirable reflection, as shown in FIG. 5B. As a result, the light utilization efficiency cannot be improved.

On the other hand, according to the light source device 110 according to the first embodiment, the outer reflection surface 64 that reflects the light reflected by the reflection surface of the ellipsoidal reflector 10 toward the ellipsoidal reflector 10 is formed on the outer surface of the secondary mirror 60. Therefore, it is possible to prevent light incident on the outer surface of the secondary mirror 60 from being absorbed by the base material constituting the secondary mirror 60 or being emitted outside the system due to undesirable reflection. In addition, since the reflection surface 14 of the ellipsoidal reflector 10 and the outer reflection surface 64 of the secondary mirror 60 are configured so that the first focal point F ₁ and the second focal point F ₂ coincide with each other, the external reflection of the secondary mirror 60 is performed. (see light L ₃ of Figure 3.) the light reflected by the surface 64 is reflected by the reflecting surface 14 of the ellipsoidal reflector 10 is converged toward the second focal point F ₂ of the ellipsoidal reflector 10 It will be. That is, according to the light source device 110 according to the first embodiment, the light reflected by the outer reflecting surface 64 of the secondary mirror 60 is effectively different from the light blocked by the outer surface 64a of the secondary mirror 60a in the comparative example. As a result, the light utilization efficiency can be improved as compared with the conventional case.

  Therefore, the light source device 110 according to the first embodiment is a light source device capable of improving the light utilization efficiency as compared with the conventional one while reducing the size of the device.

  Since the light source device 110 according to the first embodiment further includes the secondary mirror fixing member 70A described above, the secondary mirror 60 can be fixed to the arc tube 20. Further, since the secondary mirror fixing member 70A is transparent, the light reflected by the inner reflective surface 62 of the secondary mirror 60 can pass therethrough, and the light reflected by the inner reflective surface 62 of the secondary mirror 60 is effectively used. It becomes possible to do.

  In the light source device 110 according to the first embodiment, the secondary mirror fixing member 70A is a rotationally symmetric body with the illumination optical axis 100ax as an axis, and penetrates the sealing portion 50 at a substantially central position of the secondary mirror fixing member 70A. Since the through-hole 76A to be formed is formed, the sub mirror 60 can be fixed to the arc tube 20 relatively easily. Further, since the contact area between the secondary mirror 60 and the secondary mirror fixing member 70A and the contact area between the sealing portion 50 and the secondary mirror fixing member 70A are relatively large, the secondary mirror 60 is securely fixed to the arc tube 20. Is possible.

  Since the projector 1000 according to the first embodiment includes the light source device 110 that can improve the light utilization efficiency as compared with the related art while reducing the size of the device, the projector 1000 is a small projector with high brightness.

[Embodiments 2 and 3]
FIG. 6 is a diagram for explaining the light source device 112 according to the second embodiment. 6A is a side view for explaining the light source device 112, and FIG. 6B shows a state in which the secondary mirror 60 and the secondary mirror fixing member 70B are attached to the sealing portion 50 of the arc tube 20. FIG. FIG. 6C is a front view of the secondary mirror fixing member 70B.
FIG. 7 is a view for explaining the light source device 114 according to the third embodiment. 7A is a side view for explaining the light source device 114, and FIG. 7B shows a state in which the secondary mirror 60 and the secondary mirror fixing member 70C are attached to the sealing portion 50 of the arc tube 20. FIG. FIG. 7C is a front view of the secondary mirror fixing member 70C.
6 and 7, the same members as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The light source devices 112 and 114 according to the second and third embodiments basically have the same configuration as the light source device 110 according to the first embodiment, but the shape of the secondary mirror fixing member is the same as that of the light source device 110 according to the first embodiment. Is different.

  That is, in the light source device 112 according to the second embodiment, as shown in FIG. 6, a fan-shaped opening 78B is formed as an auxiliary mirror fixing member at a position above the illumination optical axis 100ax (a region on the upper side in the y-axis direction). The secondary mirror fixing member 70B is provided.

  Further, the light source device 114 according to the third embodiment includes a substantially half-moon shaped secondary mirror fixing member 70C as a secondary mirror fixing member, as shown in FIG.

  As described above, the light source devices 112 and 114 according to the second and third embodiments are different from the light source device 110 according to the first embodiment in the shape of the secondary mirror fixing member, but are the same as the light source device 110 according to the first embodiment. In addition, since the ellipsoidal reflector 10 having the reflecting surface 14 made of an ellipsoid and the secondary mirror 60 having the inner reflecting surface 62 and the outer reflecting surface 64 are provided, the light utilization efficiency is improved while reducing the size of the apparatus. The light source device can be improved as compared with the prior art.

  By the way, in the light source device including the arc tube, the temperature of the upper apex portion 32 in the bulb portion 30 is likely to be high, and the temperature difference between the upper apex portion 32 and the lower apex portion 34 in the bulb portion 30. There is a problem that it is not easy to extend the life of the arc tube due to the large length.

On the other hand, according to the light source device 112 according to the second embodiment, as shown in FIG. 6, the opening 78B is formed at the position above the illumination optical axis 100ax in the secondary mirror fixing member 70B. When the part 30 is cooled, the secondary mirror fixing member 70B does not get in the way, and the upper apex part 32 in the tube part 30 can be satisfactorily cooled. Thereby, it becomes possible to suppress the temperature rise of the upper apex portion 32 in the tube portion 30.
Further, according to the light source device 112 according to the second embodiment, as shown in FIG. 6A, the region including the lower apex portion 34 in the bulb portion 30 is formed by the secondary mirror 60 and the secondary mirror fixing member 70B. Since it will be covered, when the arc tube 20 is cooled by the cooling fan, the lower apex portion 34 in the tube portion 30 can be kept warm. As a result, the temperature difference between the upper apex portion 32 and the lower apex portion 34 in the tube portion 30 can be reduced, so that the temperature of the upper apex portion 32 in the tube portion 30 is equal to or lower than a predetermined temperature. Even when it is cooled to the above, it is possible to prevent the lower apex portion 34 of the tube portion 30 from being cooled more than necessary. As a result, it is possible to suppress a decrease in the light amount of the arc tube and damage to the arc tube due to blackening. Therefore, the light source device 112 according to the second embodiment can extend the life of the arc tube. It becomes a light source device.

Further, according to the light source device 114 according to the third embodiment, as shown in FIG. 7, since the substantially half-moon shaped secondary mirror fixing member 70 </ b> B is fixed to the sealing portion 50 with the upper side opened, When the portion 30 is cooled, the secondary mirror fixing member 70C does not get in the way, and the upper apex portion 32 in the tube portion 30 can be satisfactorily cooled. Thereby, it becomes possible to suppress the temperature rise of the upper apex portion 32 in the tube portion 30.
Further, according to the light source device 114 according to the third embodiment, as shown in FIG. 7A, the region including the lower apex portion 34 in the bulb portion 30 is formed by the secondary mirror 60 and the secondary mirror fixing member 70 </ b> C. Since it will be covered, as in the case of the light source device 112 according to the second embodiment, it becomes possible to reduce the temperature difference between the upper apex portion 32 and the lower apex portion 34 in the tube portion 30, As a result, it is possible to suppress the occurrence of light quantity reduction and damage to the arc tube due to blackening. Therefore, the light source device 114 according to the third embodiment is similar to the light source device 112 according to the second embodiment. A light source device capable of extending the life of the arc tube.

  The light source devices 112 and 114 according to the second and third embodiments have the same configuration as the light source device 110 according to the first embodiment except for the shape of the secondary mirror fixing member. It has the corresponding effect as it is.

[Embodiment 4]
FIG. 8 is a diagram for explaining the light source device 116 according to the fourth embodiment. FIG. 8A is a side view for explaining the light source device 116, and FIG. 8B shows a state in which the secondary mirror 60 and the secondary mirror fixing member 80 are attached to the sealing portion 50 of the arc tube 20. FIG. 8C is a perspective view of the secondary mirror fixing member 80, and FIG. 8D is a perspective view of the secondary mirror 60 and the secondary mirror fixing member 80 from the direction along the illumination optical axis 100ax. 8 (e) is a view when viewed from the sealing portion 50 side toward the sealing portion 40 side, and FIG. 8 (e) is an opening area S _{1 to} S of the opening portions A _{1 to} A ₃ shown in FIG. 8 (d). ₃ is a diagram illustrating a.
FIG. 9 is a diagram for explaining the light source device 116 according to the fourth embodiment.
8 and 9, the same members as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The light source device 116 according to the fourth embodiment basically has the same configuration as the light source device 110 according to the first embodiment, but the configuration of the secondary mirror fixing member is different from that of the light source device 110 according to the first embodiment.

  That is, in the light source device 116 according to the fourth embodiment, as shown in FIG. 8, as the secondary mirror fixing member, the secondary mirror 60 is fixed to the sealing portion 50 at a position on the elliptical reflector 10 side of the secondary mirror 60. The secondary mirror fixing member 80 is provided.

  The secondary mirror fixing member 80 includes secondary mirror side fixing portions 81, 82, 83 fixed to the vicinity of the opening end surface 66 (part of the inner reflection surface 62 on the opening end surface 66 side), and a seal fixed to the sealing portion 50. The stop portion side fixing portion 84 and three connecting portions 85, 86, 87 that connect the sub mirror side fixing portions 81 to 83 and the sealing portion side fixing portion 84 so as to cover a part of the outer surface of the tube portion 30. Have As shown in FIG. 8 (c), reflection surfaces 85 a, 86 a, 86 b, 86 a, 86 b, 86 b, 86 b, 86 b, 86 b, 86 b, 86 b, 87 87a is formed. The secondary mirror side fixing portions 81 to 83 are located at the tip portions of the three connecting portions 85 to 87, and the sealing portion side fixing portion 84 is located at the inner peripheral portion of the ring portion of the secondary mirror fixing member 80. The secondary mirror 60 and the secondary mirror fixing member 80 are bonded and fixed by an adhesive (not shown) applied to the secondary mirror side fixing portions 81 to 83. Further, the sub mirror fixing member 80 and the sealing portion 50 are bonded and fixed by an adhesive (not shown) applied to the portion of the sealing portion side fixing portion 84.

In the light source device 116 according to the fourth embodiment, the opening formed between two adjacent connecting portions has a total opening area of the opening above the gravity when viewed along the illumination optical axis 100ax. The total opening area of the opening below the gravitational force when viewed along the illumination optical axis 100ax is larger. Specifically, using FIG. 8D and FIG. 8E, the opening area of the opening A ₁ formed between the connecting portion 85 and the connecting portion 87 is S _1. When the opening area of the opening A ₂ formed between the connecting portion 86 is S ₂ and the opening area of the opening A ₃ formed between the connecting portion 86 and the connecting portion 87 is S ₃ , The total opening area of the opening (A ₁ ) above the gravity when viewed along the illumination optical axis 100ax, that is, S ₁ is below the gravity when viewed along the illumination optical axis 100ax. The total opening area of the openings (A ₂ , A ₃ ), that is, the sum of S ₂ and S ₃ is configured to be larger.

  In this specification, “the total opening area of the opening above the gravity when viewed along the illumination optical axis 100ax” is described with reference to FIG. When the mirror fixing member 80 is viewed from the sealing portion 50 side toward the sealing portion 40 side along the illumination optical axis 100ax, it is above the horizontal plane (xz plane) H including the illumination optical axis 100ax. This refers to the total opening area (the sum of the opening areas) of the existing openings. Further, “the total opening area of the opening below the gravity when viewed along the illumination optical axis 100ax” means that the secondary mirror 60 and the secondary mirror fixing member 80 are sealed along the illumination optical axis 100ax. When viewed from the 50 side toward the sealing portion 40 side, the total opening area (the sum of the opening areas) of the openings existing below the horizontal plane (xz plane) H including the illumination optical axis 100ax That means.

  As described above, the light source device 116 according to the fourth embodiment is different from the light source device 110 according to the first embodiment in the configuration of the secondary mirror fixing member, but similarly to the light source device 110 according to the first embodiment, an elliptical surface is used. Since the ellipsoidal reflector 10 having the reflecting surface 14 and the secondary mirror 60 having the inner reflecting surface 62 and the outer reflecting surface 64 are provided, the light utilization efficiency is improved as compared with the conventional device while miniaturizing the apparatus. It becomes the light source device which can do.

Since the light source device 116 according to the fourth embodiment further includes the secondary mirror fixing member 80 described above, the secondary mirror 60 can be reliably fixed to the arc tube 20.
In addition, since the reflecting surfaces 85a to 87a are formed on the surfaces of the connecting portions 85 to 87 that face the tube portion 30, as shown in FIG. 9, the tube portions 30 are directed toward the illuminated area. The light L ₄ incident on the portion where the connecting portions 85 to 87 are present is reflected toward the bulb portion 30 by the reflecting surfaces 85 a to 87 a formed on the connecting portions 85 to 87. After passing through the spherical portion 30, the light is reflected by the reflecting surface 14 of the ellipsoidal reflector 10 so as to be condensed at the second focal point F ₂ of the ellipsoidal reflector 10. On the other hand, light incident on a portion where the connecting portions 85 to 87 do not exist among the light radiated from the tube portion 30 toward the illuminated region (the light passing between the connecting portions 85 to 87, the light L in FIG. 9). ₂ reference.) becomes to be reflected as focused on the second focal point F ₂ of the ellipsoidal reflector by the inner reflecting surface 62 of the secondary mirror 60. That is, according to the light source device 116 according to the fourth embodiment, the light emitted from the tube portion 30 toward the illuminated region can be used without any surplus, thereby further improving the light use efficiency. It becomes a light source device capable of.

In the light source device 116 according to the fourth embodiment, the opening formed between two adjacent connecting portions is an opening (A ₁ ) above the gravity when viewed along the illumination optical axis 100ax. The total aperture area (S ₁ ) is larger than the total aperture area (S ₂ + S ₃ ) of the apertures (A ₂ , A ₃ ) below the gravity when viewed along the illumination optical axis 100ax. It is configured. As a result, the upper apex portion 32 in the tube bulb portion 30 can be cooled satisfactorily, and the temperature rise of the upper apex portion 32 in the tube bulb portion 30 can be suppressed. Further, when the arc tube 20 is cooled by the cooling fan, the lower apex portion 34 in the tube portion 30 can be kept warm, so that the upper apex portion 32 and the lower apex portion in the tube portion 30 are maintained. The temperature difference from the portion 34 can be reduced, and even when the temperature of the upper apex portion 32 in the tube portion 30 is cooled to a predetermined temperature or lower, the lower apex portion 34 in the tube portion 30. Can be prevented from being cooled more than necessary. As a result, it is possible to suppress a decrease in the light amount of the arc tube and damage to the arc tube due to blackening. Therefore, the light source device 116 according to Embodiment 4 can achieve a long life of the arc tube. It becomes a light source device.

  The light source device 116 according to the fourth embodiment has the same configuration as that of the light source device 110 according to the first embodiment except for the configuration of the secondary mirror fixing member, and therefore, among the effects of the light source device 110 according to the first embodiment. Has the relevant effect as it is.

  Although the light source device and the projector of the present invention have been described based on the above-described embodiments, the present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the scope of the invention. For example, the following modifications are possible.

  In the said Embodiment 4, although the submirror 60 and the submirror fixing member 80 were comprised as a different body and demonstrated and illustrated the case where these members are adhesively fixed, this invention is limited to this. Instead, the secondary mirror 60 and the secondary mirror fixing member 80 may be integrated.

  In the said Embodiment 4, although the secondary mirror fixing member 80 which has the three connection parts 85-87 was illustrated and demonstrated, this invention is not limited to this, 1, 2 or 4 or more You may use the secondary mirror fixing member which has these connection parts.

  In the said Embodiment 4, although the secondary mirror fixing member 80 by which the reflective surfaces 85a-87a were formed in the surface facing the tube part 30 in the connection parts 85-87 was demonstrated and demonstrated, this invention is limited to this. Is not to be done. For example, if each connecting portion is made of a transparent member, such a reflective surface may not be formed.

  Although an example in which the light source device of the present invention is applied to a projector has been described, the present invention is not limited to this. The light source device of the present invention can also be applied to other optical devices (for example, an optical disc device).

  In Embodiment 1 described above, a lens integrator optical system including a lens array is used as the light uniformizing optical system. However, the present invention is not limited to this, and a rod integrator optical system including a rod member is also preferable. Can be used.

  The projector 1000 according to the first embodiment is a transmissive projector, but the present invention is not limited to this. The present invention can also be applied to a reflection type projector. 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.

  In the first embodiment, the projector using the three liquid crystal light modulation devices 400R, 400G, and 400B has been described as an example. However, the present invention is not limited to this, and one, two, or four projectors are used. The present invention can also be applied to a projector using the above liquid crystal light modulation device.

  In the first embodiment, the liquid crystal light modulation 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.

  The present invention can be applied to a front projection type projector that projects from the side that observes the projected image, or to a rear projection type projector that projects from the side opposite to the side that observes the projected image. is there.

FIG. 3 is a view for explaining the light source device 110 and the projector 1000 according to the first embodiment. The figure shown in order to demonstrate the secondary mirror 60 and the secondary mirror fixing member 70A. The figure shown in order to demonstrate the light source device 110 which concerns on Embodiment 1. FIG. Conceptual view for explaining a principle of light from the focus F ₁ is focused on the second focal point F ₂ is reflected by the reflecting surfaces. The figure shown in order to demonstrate the light source device 110a which concerns on a comparative example. The figure shown in order to demonstrate the light source device 112 which concerns on Embodiment 2. FIG. The figure shown in order to demonstrate the light source device 114 which concerns on Embodiment 3. FIG. The figure shown in order to demonstrate the light source device 116 which concerns on Embodiment 4. FIG. The figure shown in order to demonstrate the light source device 116 which concerns on Embodiment 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Ellipsoidal reflector, 12 ... Neck-shaped fixing | fixed part, 14 ... Reflection surface of (ellipsoidal reflector), 20 ... Light-emitting tube, 30 ... Tube part, 32 ... Upper vertex part of a tube part, 34 ... Tube 40, 50 ... sealing part, 42, 52 ... electrode, 44, 54 ... metal foil, 46, 56 ... lead wire, 60, 60a ... secondary mirror, 62, 62a ... inner reflection surface 64 ... outer reflecting surface, 64a ... outer surface, 66 ... opening end surface (on the primary mirror side), 68 ... opening end surface (on the light exit side), 70A, 70B, 70C, 80 ... secondary mirror fixing members, 72A, 81, 82, 83 ... secondary mirror side fixing part, 74A, 74B, 74C, 84 ... sealing part side fixing part, 76A, 76B ... through hole, 78B ... opening part, 85, 86, 87 ... coupling part, 85a, 86a, 87a ... Reflecting surface (of the connecting portion), 90 ... Concave lens, 100 ... Illumination device, 100ax Illumination optical axis, 110, 110a, 112, 114, 116 ... light source 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 light modulation device, 500 ... cross dichroic prism 600 ... projection optical system, 1000 ... _{projector, a 1, a 2, a} 3 ... opening, reflection of _{E 1} ... (ellipsoidal reflector pictured) ellipse by the surface, E 2 _... (depicted by each reflecting surface of the secondary mirror) ellipse, F 1 _... first focal point F 2 _... second focal point, H ... horizontal plane including the illumination optical _{axis, L 1, L 2, L} 3, L 4, La ... light, _{P 1,} a point on the P 2 _... ellipse _{E 1,} P 3 _... ellipse E ₂ points, S ₁ , S ₂ , S ₃ ... opening area, SCR ... screen

Claims (7)

A primary mirror having an ellipsoidal reflecting surface;
Light emission having a light emission center in the vicinity of the first focal point of the primary mirror and having a tube bulb portion containing a pair of electrodes arranged along the illumination optical axis and a pair of sealing portions extending on both sides of the tube bulb portion Tube,
An inner reflection surface that is disposed on a sealing portion opposite to the side on which the primary mirror is disposed, and reflects light from the tube portion toward the illuminated area; A secondary mirror having an outer reflective surface that reflects light reflected by the reflective surface of the primary mirror toward the primary mirror;
Each of the inner reflection surface and the outer reflection surface includes an elliptical surface having a first focal point and a second focal point that coincide with the first focal point and the second focal point of the main mirror. The light source device according to claim 1,
The secondary mirror has a secondary mirror side fixing portion fixed in the vicinity of the opening end surface on the side opposite to the primary mirror, and a sealing portion side fixing portion fixed to the sealing portion. A light source device further comprising a mirror fixing member. The light source device according to claim 2,
The secondary mirror fixing member is composed of a rotationally symmetric body with the illumination optical axis as an axis,
A light source device according to claim 1, wherein a through hole is formed at a substantially central position of the sub mirror fixing member so as to penetrate the sealing portion. The light source device according to claim 2 or 3,
The secondary mirror fixing member further includes an opening above the gravity when viewed along the illumination optical axis. The light source device according to claim 1,
The secondary mirror side fixing part fixed to the vicinity of the opening end surface on the primary mirror side in the secondary mirror, the sealing part side fixing part fixed to the sealing part, and a part of the outer surface of the tube part are covered. In this way, the secondary mirror fixing member further comprising a plurality of connecting portions connecting the secondary mirror side fixing portion and the sealing portion side fixing portion,
A light source device, wherein a reflection surface for reflecting light from the tube bulb portion toward the tube bulb portion is formed on a surface of the plurality of connecting portions facing the tube bulb portion. The light source device according to claim 5,
The opening formed between the two adjacent connecting portions has a total opening area above the opening with respect to the gravity when viewed along the illumination optical axis, along the illumination optical axis. The light source device is configured to be larger than a total opening area of the opening below the gravity with respect to gravity. A light source device according to any one of claims 1 to 6,
An electro-optic modulator that modulates illumination light flux from the light source device according to image information;
A projector comprising: a projection optical system that projects light modulated by the electro-optic modulation device.