JP2011100630A - Light source device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device that can suppress occurrence of devitrification in a part of vessel. <P>SOLUTION: A light source device 110 includes: a high-pressure mercury lamp 10 having a vessel part 12 including a light emission part 13 and a pair of sealing portions 14, 16 extending to both sides of the vessel part 12; a reflector 20 that is disposed in a first sealing portion 14 and reflects light output from the light emission part 13 to an illuminated area; and a secondary mirror 30 reflecting part or all of light of the light output from the light emission part 13 that is not directly incident upon the reflector 20 to the light emission part 13, which is characterized in that on a reflective surface 34 of the secondary mirror 30, a fluorescent layer 36 containing a fluorescent material emitting visible light with absorbing ultraviolet light is formed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  Conventionally, a high-pressure mercury lamp having a tube bulb portion containing a light emitting portion and a pair of sealing portions extending on both sides of the tube bulb portion, and a predetermined first sealing portion of the pair of sealing portions, are arranged to emit light. A reflector that reflects the light emitted from the light-emitting portion toward the illuminated region, and a sub-mirror that reflects part or all of the light emitted from the light-emitting portion that does not directly enter the reflector toward the light-emitting portion; Is known (for example, refer to Patent Document 1).

  According to the conventional light source device, since the sub-mirror that reflects part or all of the light emitted from the light emitting unit that does not directly enter the reflector toward the light emitting unit is provided, the luminance of the light source device is increased. It becomes possible.

JP 2005-5183 A

  By the way, the light emitted from the light emitting part of the high-pressure mercury lamp includes ultraviolet light having an action of promoting devitrification of the material (quartz glass or the like) constituting the tube part. In the conventional light source device, since the ultraviolet light reflected by the secondary mirror passes through the bulb part and reaches the light emitting part, the ultraviolet light that passes through the bulb part due to the presence of the ultraviolet light reflected by the secondary mirror. The amount of light increases. For this reason, in the conventional light source device, the occurrence of devitrification in the tube portion may increase depending on the use environment, and means for suppressing this is required.

  Then, this invention is made | formed in view of the said situation, and it aims at providing the light source device which can suppress generation | occurrence | production of devitrification in a bulb part. It is another object of the present invention to provide a projector that can reduce the frequency of replacing a high-pressure mercury lamp by including such a light source device.

[1] A light source device according to the present invention includes a high-pressure mercury lamp having a tube bulb portion including a light-emitting portion and a pair of seal portions extending on both sides of the tube bulb portion, and a predetermined first of the pair of seal portions. A reflector that is disposed in one sealing portion and reflects light emitted from the light emitting portion toward an illuminated area; and a portion of light that is not directly incident on the reflector out of light emitted from the light emitting portion Alternatively, the light source device includes a secondary mirror that reflects all of the light toward the light emitting unit, and the reflective surface of the secondary mirror has a fluorescent layer containing a phosphor that absorbs ultraviolet light and emits visible light. It is formed.

  For this reason, according to the light source device of the present invention, since the fluorescent layer containing the phosphor that absorbs ultraviolet light and emits visible light is formed on the reflecting surface of the secondary mirror, it is reflected by the secondary mirror. Since the amount of ultraviolet light can be reduced as compared with the conventional light source device, the occurrence of devitrification in the tube portion can be suppressed, and the object of the present invention is achieved.

  Further, according to the light source device of the present invention, the following effects (a) and (b) can be obtained.

  (A) By the way, in order to protect a human body and an optical member from ultraviolet light, ultraviolet light may be removed using an ultraviolet light filter. In such a case, if ultraviolet light is to be removed at a large rate, visible light is also absorbed accordingly, so that it is difficult to increase the luminance of the light source device. On the other hand, according to the light source device of the present invention, as described above, a fluorescent layer containing a phosphor that absorbs ultraviolet light and emits visible light is formed on the reflecting surface of the secondary mirror. The ratio of removing ultraviolet light can be reduced, and the luminance of the light source device can be increased by reducing the absorption of visible light.

  (A) In the conventional light source device, the ultraviolet light reflected by the secondary mirror and reaching the light emitting part is once absorbed by the plasma-filled enclosure and then re-emitted. At this time, part of the energy of the ultraviolet light becomes heat, and the high-pressure mercury lamp may be overheated. On the other hand, according to the light source device of the present invention, as described above, a fluorescent layer containing a phosphor that absorbs ultraviolet light and emits visible light is formed on the reflecting surface of the secondary mirror. It is possible to reduce the amount of ultraviolet light absorbed by the encapsulated inclusion, and to suppress overheating of the high-pressure mercury lamp.

  In order to obtain a larger effect than the effect described in (a) above, it is preferable that the phosphor sufficiently absorbs bright lines in the ultraviolet region. Since the bright line in the ultraviolet light region is particularly easily absorbed by the plasma inclusion, the above configuration makes it possible to reduce the amount of ultraviolet light absorbed by the plasma inclusion. Therefore, it is possible to effectively suppress the high pressure mercury lamp from overheating.

  In the present specification, the “high pressure mercury lamp” is used to mean not only a general high pressure mercury lamp but also a super high pressure mercury lamp.

[2] In the light source device of the present invention, the sub mirror is disposed in a second sealing portion different from the first sealing portion among the pair of sealing portions, and the illuminated region extends from the light emitting portion. It is preferable that a part or all of the light emitted to the side is reflected toward the light emitting unit.

  As described above, the present invention can be preferably applied to a high-luminance light source device including a secondary mirror.

[3] In the light source device of the present invention, the reflector has a shape in which at least one end portion on one side is deleted when cut along a predetermined plane including the rotation center axis, and the sub mirror includes the tube Preferably, the light source is disposed so as to cover the one side of the sphere, and reflects light emitted from the light emitting unit to the one side toward the light emitting unit.

  As described above, the present invention can also be suitably applied to a thin light source device including a secondary mirror.

[4] In the light source device of the present invention, it is preferable that the phosphor emits red light as visible light.

  By the way, the light from the high-pressure mercury lamp generally has a low proportion of red light component, so that the color rendering properties of the light source device tend to be low. However, with the configuration as described above, the ratio of the red light component can be increased, so that the color rendering properties of the light source device can be increased.

  In addition, since red light is hardly absorbed by the encapsulated inclusion, it is possible to further strongly prevent the high pressure mercury lamp from being overheated by adopting the above configuration.

[5] In the light source device of the present invention, the phosphor layer preferably contains two or more kinds of phosphors as the phosphor.

  By adopting such a configuration, it becomes possible to absorb ultraviolet light in a wider wavelength band using two or more kinds of phosphors.

  In addition, with the above-described configuration, it is possible to further enhance the color rendering properties of the light source device by emitting visible light in various wavelength bands using two or more kinds of phosphors.

[6] In the light source device of the present invention, it is preferable that the fluorescent layer is formed on the entire reflecting surface of the sub mirror.

  By setting it as such a structure, it becomes possible to suppress generation | occurrence | production of devitrification in a bulb part with a wide area. Further, since the secondary mirror can be easily manufactured, the manufacturing cost of the light source device can be reduced by adopting the above configuration.

[7] In the light source device of the present invention, it is preferable that the fluorescent layer is partially formed on the reflection surface of the sub mirror.

  By setting it as such a structure, it becomes possible to make appropriate the light quantity of the visible light discharge | released from a fluorescent layer. For example, if the fluorescent layer is formed on the entire reflecting surface of the secondary mirror, the amount of emitted visible light becomes excessive, and the color balance may deteriorate. In such a case, the amount of visible light can be made appropriate by forming a fluorescent layer partially on the reflecting surface of the secondary mirror.

[8] A projector of the present invention projects an illumination device including the light source device of the present invention, a light modulation device that modulates illumination light from the illumination device in accordance with image information, and a modulated light from the light modulation device. And a projection optical system for projecting as an image.

  For this reason, since the projector of the present invention includes the light source device of the present invention, the frequency of replacing the high-pressure mercury lamp is reduced by the effect of the light source device capable of suppressing the occurrence of devitrification in the high-pressure mercury lamp. It becomes a projector that can.

FIG. 3 is a top view showing an optical system of the projector 1000 according to the first embodiment. The figure shown in order to demonstrate the light source device 110 which concerns on Embodiment 1. FIG. FIG. 6 is a perspective view of a light source device 112 according to Embodiment 2. The figure shown in order to demonstrate the light source device 112 which concerns on Embodiment 2. FIG. The figure which looked at the secondary mirror 80 in the modification 1 from the bulb part side. The figure which looked at the secondary mirror 81 in the modification 2 from the bulb part side.

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

[Embodiment 1]
FIG. 1 is a top view showing an optical system of a projector 1000 according to the first embodiment. FIG. 2 is a diagram for explaining the light source device 110. 2A is a cross-sectional view of the light source device 110, FIG. 2B is a view of the secondary mirror 30 viewed from the tube portion 12 side, and FIG. 2C is R1 in FIG. 2A. It is a figure which expands and shows the range.

In the following description, three directions orthogonal to each other are defined as a z-axis direction (illumination optical axis 100ax direction in FIG. 1), an x-axis direction (a direction parallel to the paper surface in FIG. An axial direction (direction perpendicular to the paper surface in FIG. 1 and perpendicular to the z-axis) is assumed.
Further, in the following description, since the case where the projector 1000 is arranged in a so-called stationary state is exemplarily shown, the direction of gravity is the lower side of the page (for example, the y (−) direction in FIG. 2A). .)

  As shown in FIG. 1, the projector 1000 according to the first embodiment includes an illuminating device 100 that emits illuminating light along the illuminating optical axis 100ax, and three illuminating lights from the illuminating device 100 that are red light, green light, and blue light. The color separation light guide optical system 200 that separates the light into the colored areas and guides it to the illuminated area, and the light modulation that modulates each of the three color lights separated and guided by the color separation light guide optical system 200 according to image information Three liquid crystal devices 400R, 400G, and 400B as devices, a cross dichroic prism 500 that synthesizes each color light modulated by the three liquid crystal devices 400R, 400G, and 400B, and a light that is synthesized by the cross dichroic prism 500 is screen SCR. And a projection optical system 600 that projects onto a projection surface such as the above.

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

  As shown in FIGS. 1 and 2A, the light source device 110 includes a high-pressure mercury lamp 10, a reflector 20 that reflects light emitted from the light emitting unit 13 toward the illuminated area, and an emission from the light emitting unit 13. And a secondary mirror 30 that reflects a part of the light that is not directly incident on the reflector 20 (light emitted from the light emitting unit 13 toward the illuminated region) toward the light emitting unit 13. The light source device 110 emits light whose central axis is the rotational symmetry axis 20ax. Note that the rotational symmetry axis 20ax in FIG. 2A coincides with the illumination optical axis 100ax in FIG.

  The high-pressure mercury lamp 10 includes a tube bulb portion 12 containing a light emitting portion 13, a pair of sealing portions 14 and 16 extending on both sides of the tube bulb portion 12, and a pair of electrodes arranged along the rotational symmetry axis 20 ax of the reflector 20. 42, 52, a pair of metal foils 44, 54 sealed in the pair of sealing portions 14, 16, respectively, and a pair of lead wires 46, 56 electrically connected to the pair of metal foils 44, 54, respectively. Have. The light emitting unit 13 is located in the vicinity of a first focal point of a reflection surface 24 described later.

  When the conditions of the constituent elements of the high-pressure mercury lamp 10 are exemplarily shown, the tube portion 12 and the sealing portions 14 and 16 are made of, for example, quartz glass, and mercury, a rare gas, and a small amount are contained in the tube portion 12. 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.

  As shown in FIG. 2A, the reflector 20 includes an opening 22 for inserting and fixing the first sealing portion 14 of the high-pressure mercury lamp 10, and a reflecting surface that reflects light toward the illuminated area. 24. The reflecting surface 24 is an elliptical surface, and reflects the light emitted from the light emitting unit 13 located in the vicinity of the first focal point as the condensed light gathered in the vicinity of the second focal point on the illuminated region side. The reflector 20 is disposed on the first sealing portion 14 of the pair of sealing portions 14 and 16 by an inorganic adhesive such as cement filled in the opening 22.

For example, crystallized glass, alumina (Al ₂ O ₃ ), or the like can be suitably used as a material for the base material constituting the reflecting surface 24. On the inner surface of the reflecting surface 24, 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. 2A to 2C, the secondary mirror 30 is emitted from the light emitting unit 13 and the opening 32 for inserting and fixing the second sealing unit 16 of the high-pressure mercury lamp 10. And a reflection surface 34 that reflects the reflected light toward the light emitting unit 13. The secondary mirror 30 is disposed on the second sealing portion 16 different from the first sealing portion 14 of the pair of sealing portions 14 and 16 by an inorganic adhesive such as cement filled in the opening 32. Yes.

For example, crystallized glass, alumina (Al ₂ O ₃ ), or the like can be suitably used as the material for the base material constituting the reflecting surface 34. On the inner surface of the reflection surface 34, for example, a visible light reflection layer made of a dielectric multilayer film of titanium oxide (TiO ₂ ) and silicon oxide (SiO ₂ ) is formed.

  On the reflection surface 34 of the secondary mirror 30, a fluorescent layer 36 containing one kind of phosphor that absorbs ultraviolet light and emits red light is formed. The fluorescent layer 36 is formed on the entire reflecting surface 34 as shown in FIG.

  The fluorescent layer 36 can be formed, for example, by applying a fluorescent layer material in which a phosphor and a resin material are combined onto the reflecting surface 34 using a spray method, an ink jet method, or the like. Further, the fluorescent layer 36 can be formed by a vapor deposition method, or can be formed by disposing a fluorescent glass containing a predetermined phosphor on the reflecting surface 34.

Examples of the phosphor include Y ₂ O ₃ : Eu, Y ₂ SiO ₅ : Eu, Y ₃ Al ₅ O ₁₂ : Eu, Zn ₃ (PO ₄ ) ₂ : Mn, YBO ₃ : Eu, (Y, Gd) BO ₃ : Eu, GdBO ₃ : Eu, ScBO ₃ : Eu, LuBO ₃ : Eu, or the like can be used.

  In addition, it is preferable that a fluorescent substance fully absorbs the bright line in an ultraviolet region. By adopting such a configuration, it becomes possible to reduce the amount of ultraviolet light absorbed in the encapsulated inclusion, so that it is possible to effectively suppress overheating of the high-pressure mercury lamp. .

  As shown in FIG. 1, the concave lens 90 is disposed on the illuminated region side of the reflector 20. The light from the reflector 20 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 the light from the concave lens 90 into a plurality of partial light beams. It has a configuration arranged in a matrix of rows and columns. 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 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 devices 400R, 400G, and 400B 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 one linearly polarized light component among the polarized light components included in the illumination light beam from the light source device 110 and reflects the other linearly polarized light component in a direction perpendicular to the illumination optical axis 100ax, and A reflection layer that reflects the other linearly polarized light component reflected by the polarization separating layer in a direction parallel to the illumination optical axis 100ax, and a phase difference that converts one linearly polarized light component transmitted through the polarized light separating layer into the other linearly polarized light component And a board.

  The superimposing lens 150 condenses 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 superimposes them on the vicinity of the image forming regions of the liquid crystal devices 400R, 400G, and 400B. It is an element. 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 first lens array 120, the second lens array 130, and the superimposing lens 150 constitute a light uniforming optical system that uniformizes the in-plane intensity distribution of light incident on the light modulation device.

  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 from the illumination device 100 into three color lights of red light, green light, and blue light, and the three liquid crystal devices 400R and 400G that are the illumination targets. , 400B.

  Condensing lenses 300R, 300G, and 300B are disposed in the front stage of the optical path of the liquid crystal devices 400R, 400G, and 400B.

The liquid crystal devices 400 </ b> R, 400 </ b> G, and 400 </ b> B modulate illumination light according to image information, and are illumination targets of the illumination device 100.
The liquid crystal devices 400R, 400G, and 400B are a pair of transparent glass substrates in which a liquid crystal that is an electro-optical material is hermetically sealed. For example, incident side polarization is performed according to given image information using a polysilicon TFT as a switching element. The polarization direction of one type of linearly polarized light emitted from the plate is modulated.

  Although not shown here, incident-side polarizing plates are interposed between the condenser lenses 300R, 300G, and 300B and the liquid crystal devices 400R, 400G, and 400B, and the liquid crystal devices 400R, 400G, and 400B are disposed. Between the 400B and the cross dichroic prism 500, an exit side polarizing plate is interposed. The incident-side polarizing plate, the liquid crystal devices 400R, 400G, and 400B and the exit-side polarizing plate modulate light of each color light incident thereon.

  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 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 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, the fluorescent layer 36 containing a phosphor that absorbs ultraviolet light and emits visible light is formed on the reflection surface 34 of the sub-mirror 30. Therefore, it is possible to reduce the amount of ultraviolet light reflected by the secondary mirror 30 as compared with the case of the conventional light source device, and thus it is possible to suppress the occurrence of devitrification in the bulb portion 12. Become.

  Further, according to the light source device 110 according to the first embodiment, the reflecting surface 34 of the sub-mirror 30 is formed with the fluorescent layer 36 containing the phosphor that absorbs ultraviolet light and emits visible light. It is possible to reduce the amount of ultraviolet light absorbed by the encapsulated enclosure, and to suppress overheating of the high-pressure mercury lamp 10.

  Further, according to the light source device 110 according to the first embodiment, since the phosphor emits red light as visible light, the proportion of the red light component can be increased, and the color rendering property of the light source device 110 can be increased. Is possible.

  In addition, according to the light source device 110 according to the first embodiment, red light is hardly absorbed by the encapsulated inclusion, so that the high pressure mercury lamp 10 can be further suppressed from overheating.

  Further, according to the light source device 110 according to the first embodiment, since the fluorescent layer 36 is formed on the entire reflecting surface 34 of the secondary mirror 30, the occurrence of devitrification in the bulb portion 12 can be suppressed over a wide area. It becomes possible. Further, since the secondary mirror 30 can be easily manufactured, the manufacturing cost of the light source device 110 can be reduced.

  Since the projector 1000 according to the first embodiment includes the light source device 110 according to the first embodiment, the high-pressure mercury lamp 10 is replaced by the effect of the light source device 110 that can suppress the occurrence of devitrification in the high-pressure mercury lamp 10. Thus, the projector can be reduced in frequency.

  As described above, the present invention can be suitably applied to the light source device 110 that is a high-intensity light source device including the secondary mirror 30.

[Embodiment 2]
FIG. 3 is a perspective view of the light source device 112 according to the second embodiment. FIG. 4 is a diagram for explaining the light source device 112 according to the second embodiment. 4A is a cross-sectional view of the light source device 112, and FIG. 4B is an enlarged view of the range R2 in FIG. 4A.

  The light source device 112 according to the second embodiment basically has the same configuration as the light source device 110 according to the first embodiment, but the configuration of the reflector and the secondary mirror is different from that of the light source device 110 according to the first embodiment. . In other words, in the light source device 112 according to the second embodiment, as shown in FIGS. 3 and 4A, the reflector 60 is cut on one side (y (−) when cut along a predetermined plane including the rotation center axis 60ax. ) Direction) portion (substantially half of the reflecting surface; see reference numeral 60D in FIGS. 3 and 4A) is removed, and the secondary mirror 70 is one side of the tube portion 12. The light emitted from the light emitting unit 13 to one side is reflected toward the light emitting unit 13.

  As shown in FIG. 4A, the reflector 60 includes an opening 62 for inserting and fixing the first sealing portion 14 of the high-pressure mercury lamp 10 and the opening 72 of the secondary mirror 70, and light to be illuminated. And a reflecting surface 64 that reflects toward the side. The reflecting surface 64 is an elliptical surface, and reflects the light emitted from the light emitting unit 13 located in the vicinity of the first focus as the focused light gathered in the vicinity of the second focus on the illuminated area side. The reflector 60 is disposed on the first sealing portion 14 of the pair of sealing portions 14 and 16 by an inorganic adhesive such as cement filled in the opening 62.

  As shown in FIG. 4A, the secondary mirror 70 has an opening 72 for inserting and fixing the first sealing portion 14 of the high-pressure mercury lamp 10, and the light emitted from the light emitting portion 13. And a support portion 78 that supports the reflection surface 74. The secondary mirror 70 is disposed in the first sealing portion 14 with an inorganic adhesive such as cement filled in the opening 72.

  As shown in FIGS. 4A and 4B, a fluorescent layer 76 containing a phosphor that absorbs ultraviolet light and emits red light is formed on the reflecting surface 74 of the secondary mirror 70. . The fluorescent layer 76 is formed on the entire surface of the reflection surface 74, though detailed description thereof is omitted.

  As described above, the light source device 112 according to the second embodiment is different from the light source device 110 according to the first embodiment in the configuration of the reflector and the secondary mirror, but the reflecting surface 74 of the secondary mirror 70 absorbs ultraviolet light. Since the fluorescent layer 76 containing the phosphor that emits visible light is formed, it is reflected by the secondary mirror 70 as compared with the case of the thin light source device including the secondary mirror in which the fluorescent layer is not formed. Since it is possible to reduce the amount of ultraviolet light, it is possible to suppress the occurrence of devitrification in the tube portion 12 as in the case of the light source device 110 according to the first embodiment.

  The light source device 112 according to the second embodiment has the same configuration as that of the light source device 110 according to the first embodiment except for the configuration of the reflector and the secondary mirror. Therefore, the light source device 110 according to the first embodiment includes the light source device 112 according to the first embodiment. It has the corresponding effect as it is.

  As described above, the present invention can also be suitably applied to the thin light source device 112 including the secondary mirror 70.

  As mentioned above, although this invention was demonstrated based on said embodiment, this invention is not limited to said embodiment. The present invention can be carried out in various modes without departing from the spirit thereof, and for example, the following modifications are possible.

(1) In each of the above embodiments, a projector further including an ultraviolet light filter that removes ultraviolet light may be used as the projector. With such a configuration, it is possible to protect the human body and the optical member from ultraviolet light. Even when such a projector is used, it is possible to suppress the occurrence of devitrification in the tube portion. In addition, the reflecting surface of the secondary mirror is formed with a fluorescent layer containing a phosphor that absorbs ultraviolet light and emits visible light, so it is possible to reduce the rate of removing ultraviolet light in the ultraviolet light filter. Thus, the absorption of visible light can be reduced and the luminance of the light source device can be increased.

(2) In each of the above embodiments, the phosphor emits red light as visible light, but the present invention is not limited to this. The phosphor may emit visible light other than red light.

(3) In each of the above embodiments, the fluorescent layer contains one type of phosphor, but the present invention is not limited to this. The phosphor layer may contain two or more kinds of phosphors as phosphors. By adopting such a configuration, it becomes possible to absorb ultraviolet light in a wider wavelength band using two or more kinds of phosphors. Further, by using two or more kinds of phosphors and emitting visible light in various wavelength bands, the color rendering property of the light source device can be further enhanced.

(4) In each of the above embodiments, the fluorescent layer is formed on the entire reflecting surface of the secondary mirror, but the present invention is not limited to this. The fluorescent layer may be partially formed on the reflecting surface of the secondary mirror. FIG. 5 is a view of the secondary mirror 80 in Modification 1 as seen from the tube portion side. FIG. 6 is a view of the secondary mirror 81 in the second modification as viewed from the tube portion side. As shown in FIG. 5, the secondary mirror 80 in Modification 1 has a fluorescent layer 86 formed concentrically. In the secondary mirror 81 in Modification 2, the fluorescent layer 88 is formed radially as shown in FIG. Has been. By setting it as such a structure, it becomes possible to make appropriate the light quantity of the visible light discharge | released from a fluorescent layer.

(5) In the second embodiment, the secondary mirror 70 is disposed in the first sealing portion 14, but the present invention is not limited to this. A secondary mirror may be disposed in the second sealing portion.

(6) In each said embodiment, although the reflective surface in a reflector is an ellipse, this invention is not limited to this. The reflecting surface of the reflector may be a parabolic surface.

(7) In each of the above embodiments, 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. You may use the rod integrator optical system which consists of a rod member.

(8) In each of the above embodiments, the projector 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 a light modulation device as a light modulation means such as a transmission type liquid crystal device transmits light, and “reflection type” means reflection. This means that a light modulation device as a light modulation means such as a liquid crystal device of a type 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.

(9) In each of the above embodiments, a projector using three liquid crystal devices 400R, 400G, and 400B has been described as an example. However, the present invention is not limited to this. The present invention can also be applied to a projector using one, two, or four or more liquid crystal devices.

(10) In each of the above embodiments, the liquid crystal device is used as the light modulation device, but the present invention is not limited to this. In general, the light modulation device only needs to modulate incident light according to 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.

(11) The present invention can be applied to a rear projection type projector that projects from a side opposite to the side that observes the projected image, even when applied to a front projection type projector that projects from the side that observes the projected image. Is also possible.

(12) In each of the above embodiments, the example in which the light source device of the present invention is applied to a projector has been described, but the present invention is not limited to this. For example, the light source device of the present invention can also be applied to other optical devices (for example, an optical disk device, an automobile headlamp, etc.).

DESCRIPTION OF SYMBOLS 10 ... High pressure mercury lamp, 12 ... Tube part, 13 ... Light emission part, 14 ... 1st sealing part, 16 ... 2nd sealing part, 60, 60 ... Reflector, 20ax, 60ax ... Rotation symmetry axis, 22,62 ... opening of (reflector), 24, 64 ... reflecting surface of (reflector), 30, 70, 80, 81 ... secondary mirror, 32, 72, 82 ... opening of (secondary mirror), 34, 74, 84 ... Reflective surface (secondary mirror), 36, 76, 86, 88 ... fluorescent layer, 42, 52 ... electrode, 44, 54 ... metal foil, 46, 56 ... lead wire, 60D ... almost half reflective surface, 78 ... support , 90 ... concave lens, 100 ... illumination device, 100ax ... illumination optical axis, 110, 112 ... light source device, 120 ... first lens array, 122 ... first small lens, 130 ... second lens array, 132 ... second small Lens 140: Polarization conversion element 150 ... Superimposition 200 ... color separation light guide optical system, 210, 220 ... dichroic mirror, 230, 240, 250 ... reflection mirror, 260 ... incident side lens, 270 ... relay lens, 300R, 300G, 300B ... condensing lens, 400R, 400G, 400B ... Liquid crystal device, 500 ... Cross dichroic prism, 600 ... Projection optical system, 1000 ... Projector, SCR ... Screen

Claims (8)

A high-pressure mercury lamp having a tube bulb portion including a light emitting portion and a pair of sealing portions extending on both sides of the tube bulb portion;
A reflector that is disposed in a predetermined first sealing portion of the pair of sealing portions and reflects light emitted from the light emitting portion toward an illuminated region;
A light source device including a sub-mirror that reflects part or all of light that is not directly incident on the reflector out of light emitted from the light-emitting unit toward the light-emitting unit;
A light source device characterized in that a fluorescent layer containing a phosphor that absorbs ultraviolet light and emits visible light is formed on the reflection surface of the sub mirror. The light source device according to claim 1,
The secondary mirror is disposed in a second sealing portion different from the first sealing portion among the pair of sealing portions, and part or all of the light emitted from the light emitting portion to the illuminated region side Is reflected toward the light emitting unit. The light source device according to claim 1,
The reflector has a shape in which at least one end on one side is deleted when cut along a predetermined plane including a rotation center axis,
The secondary mirror is disposed so as to cover the one side of the tube portion, and reflects part or all of the light emitted from the light emitting portion to the one side toward the light emitting portion. A light source device. In the light source device in any one of Claims 1-3,
The light source device according to claim 1, wherein the phosphor emits red light as visible light. In the light source device in any one of Claims 1-4,
The phosphor layer contains two or more kinds of phosphors as the phosphor. In the light source device according to any one of claims 1 to 5,
The light source device, wherein the fluorescent layer is formed on the entire reflecting surface of the sub mirror. In the light source device according to any one of claims 1 to 5,
The light source device according to claim 1, wherein the fluorescent layer is partially formed on a reflection surface of the secondary mirror. A lighting device comprising the light source device according to any one of claims 1 to 7,
A light modulation device that modulates illumination light from the illumination device according to image information;
A projector comprising: a projection optical system that projects the modulated light from the light modulation device as a projection image.

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