JP2011099995A - Light source device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of suppressing the occurrence of devitrification in a bulb portion. <P>SOLUTION: The light source device 110 includes a high-pressure mercury lamp 10 having a bulb portion 12 involving a light emitting portion 13 and a pair of sealing portions 14 and 16, extending to both sides of the bulb portion 12, and a reflector 20 disposed at the predetermined first sealing portion 14 between the pair of sealing portions 14 and 16 and reflecting the light emitted from the light-emitting portion 13 toward a region to be illuminated. In the light source device, a fluorescent layer 26, containing a phosphor that absorbs ultraviolet light and emits visible light, is formed in an inner periphery region R1 close to a portion that holds the first sealing portion 14 on a reflecting surface 24 of the reflector 20, when the reflector 20 is viewed from a side of the region to be illuminated. <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. There is known a light source device including a reflector that reflects light emitted from a portion toward an illuminated region (see, for example, Patent Document 1).

  According to the conventional light source device, since the high pressure mercury lamp is provided, the luminance of the light source device can be increased.

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 recent years, in the light source device, the size of the light emitting unit has increased as the brightness of the light source device has increased, so that the ultraviolet light emitted from the light emitting unit and passing through the tube part is reflected by the reflector and again. The proportion of ultraviolet light that passes through the tube is increasing. As a result, the conventional light source device is in a situation where devitrification is likely to occur in the tube portion as the luminance of the light source device increases, 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 capable of extending the life of 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 light source device that is disposed in one sealing portion and reflects light emitted from the light emitting portion toward an illuminated region, and when the reflector is viewed from the illuminated region side, A fluorescent layer containing a phosphor that absorbs ultraviolet light and emits visible light is formed in the inner peripheral region in the vicinity of the portion that holds the first sealing portion of the reflecting surface of the reflector. And

  For this reason, according to the light source device of the present invention, the inner peripheral region in the vicinity of the portion holding the first sealing portion of the reflecting surface of the reflector contains a phosphor that absorbs ultraviolet light and emits visible light. Since the fluorescent layer is formed, the proportion of the ultraviolet light that is reflected from the reflector and passes through the tube portion again out of the ultraviolet light that is emitted from the light emitting portion and passes through the tube portion is larger than in the case of the conventional light source device. It becomes possible to make it small, and it becomes possible to suppress generation | occurrence | production of devitrification in a bulb part.

  Conventionally, there has been known a light source device including a wavelength conversion layer made of a transparent phosphor on the entire reflecting surface of a reflector (see, for example, JP-A-2007-52047). According to this light source device, since the wavelength conversion layer is provided on the entire reflecting surface of the reflector, the ultraviolet light that has been reflected from the reflector out of the ultraviolet light that has been emitted from the light emitting portion and passed through the bulb portion, and again passes through the bulb portion. The ratio can be reduced, and the occurrence of devitrification in the tube portion can be suppressed. However, in the above light source device, since the wavelength conversion layer is provided on the entire reflecting surface of the reflector, the reflectance of visible light other than ultraviolet light is lowered. As a result, it is considered difficult to increase the luminance of the light source device. On the other hand, in the light source device of the present invention, since the fluorescent layer is formed in the inner peripheral region in the vicinity of the portion that holds the first sealing portion on the reflecting surface of the reflector, the above problems are reduced. The luminance of the light source device can be increased while suppressing the occurrence of devitrification in the tube portion.

  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 outer peripheral shape of the inner peripheral region is substantially circular, and has substantially the same size as the diameter of the tube portion when viewed from the illuminated region side. Is preferred.

  In this way, the area where the reflected light cannot be effectively used in the reflecting surface of the reflector is the inner peripheral area, and thus the problem of the light source device described in JP 2007-52047 A is completely eliminated. can do.

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

  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.

[4] 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.

[5] In the light source device of the present invention, it is preferable that the fluorescent layer is partially formed in a region other than the inner peripheral region of the reflecting surface of the reflector.

  By the way, in order to protect a human body and an optical member from ultraviolet light, the 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, the reflecting surface of the reflector contains a phosphor that partially absorbs ultraviolet light and emits visible light in addition to the inner peripheral region. Since the fluorescent layer is formed, it is possible to further reduce the rate of removing ultraviolet light, and it is possible to further reduce the absorption of visible light and increase the luminance of the light source device.

  Further, with the above-described configuration, it is possible to increase the amount of visible light emitted from the light source device, so that the color rendering properties of the light source device can be further enhanced.

[6] In the light source device of the present invention, the reflector of the light emitted from the light emitting unit is disposed in a second sealing unit different from the first sealing unit among the pair of sealing units. It is preferable to further include a secondary mirror that reflects part or all of the light not directly incident on the light emitting unit.

  Even in such a high-intensity light source device including a secondary mirror, the ratio of the ultraviolet light that is reflected from the reflector and passes through the tube portion again out of the ultraviolet light that is emitted from the light emitting portion and passes through the tube portion is determined by the conventional light source. It becomes possible to make smaller than the case of an apparatus, and it becomes possible to suppress generation | occurrence | production of devitrification in a bulb part.

[7] In the light source device of the present invention, it is preferable that a fluorescent layer containing a phosphor that absorbs ultraviolet light and emits visible light is also formed on the reflecting surface of the secondary mirror.

  By adopting such a configuration, the ratio of the ultraviolet light which is reflected from the secondary mirror and passes again through the tube portion out of the ultraviolet light emitted from the light emitting portion and passed through the tube portion is larger than that in the case of the conventional light source device. It becomes possible to make it small, and it becomes possible to suppress generation | occurrence | production of devitrification in a bulb part.

[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. The figure shown in order to demonstrate the light source device 112 which concerns on Embodiment 2. FIG. The figure which looked at the reflector 70 in the modification 1 from the to-be-illuminated area side. The figure which looked at the reflector 80 in the modification 2 from the to-be-illuminated area 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, and FIG. 2B is a view of the reflector 20 as viewed from the illuminated region side.

  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. 1 and perpendicular to the z-axis), and y. Let it be an axial direction (a direction perpendicular to the paper surface in FIG. 1 and perpendicular to the z-axis).

  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. As a light-separating light-guiding optical system 200 that separates light into one color light and guides it to the illuminated region, and a light modulation device that modulates each of the three color lights separated by the color-separating light-guiding optical system 200 according to image information Three liquid crystal devices 400R, 400G, and 400B, a cross dichroic prism 500 that synthesizes the color lights modulated by the three liquid crystal devices 400R, 400G, and 400B, and a light that is synthesized by the cross dichroic prism 500 is projected onto a screen SCR or the like. The projector includes a projection optical system 600 that projects onto a surface.

  The illumination device 100 includes a light source device 110 that emits 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 the light emitted from the concave lens 90 into a plurality of partial light beams. A first lens array 120 having a plurality of first small lenses 122 for division, and a 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. A polarization conversion element 140 that converts each partial light beam from the second lens array 130 into approximately one type of linearly polarized light having a uniform polarization direction and emits the partial light flux, and receives each partial light beam emitted from the polarization conversion element 140. And a superimposing lens 150 for superimposing in the illumination area.

  As shown in FIGS. 1 and 2A, the light source device 110 includes a high-pressure mercury lamp 10 and a reflector 20 that reflects the light emitted from the light emitting unit 13 toward the illuminated area. 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 includes a tube bulb 12 containing the light emitting portion 13, a pair of sealing portions 14 and 16 extending on both sides of the tube bulb 12, and a pair of electrodes 42 disposed along the rotational symmetry axis 20 ax of the reflector 20. 52, a pair of metal foils 44 and 54 sealed in the pair of sealing portions 14 and 16, respectively, and a pair of lead wires 46 and 56 electrically connected to the pair of metal foils 44 and 54, respectively. . 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. In the tube portion 12, mercury, rare gas, 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.

  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 concentrates the light emitted from the light emitting unit 13 located in the vicinity of the first focal point to the second focal point on the illuminated area 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.

  A fluorescent layer 26 containing one type of phosphor that absorbs ultraviolet light and emits red light is present in the inner peripheral region R1 in the vicinity of the portion that holds the first sealing portion 14 of the reflecting surface 24 of the reflector 20. Is formed. As shown in FIG. 2B, the fluorescent layer 26 has substantially the same size as the outer peripheral shape of the inner peripheral region R1. The outer peripheral shape of the inner peripheral region R1 is substantially circular, and has substantially the same size as the diameter of the tube portion 12 when the light source device 110 is viewed from the illuminated region side.

  The fluorescent layer 26 can be formed, for example, by applying a fluorescent layer raw material in which a phosphor and a resin material are combined onto the reflecting surface 24 using a spray method, an inkjet method, or the like. Further, the fluorescent layer 26 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 24.

  Examples of the phosphor include Y2O3: Eu, Y2SiO5: Eu, Y3Al5O12: Eu, Zn3 (PO4) 2: Mn, YBO3: Eu, (Y, Gd) BO3: Eu, GdBO3: Eu, ScBO3: Eu, and LuBO3: Eu or the like can be used.

  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 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 inner peripheral region R1 in the vicinity of the portion that holds the first sealing portion 14 in the reflecting surface 24 of the reflector 20 absorbs ultraviolet light. Since the fluorescent layer 26 containing the phosphor that emits visible light is formed, the ultraviolet light that is emitted from the light emitting portion and passes through the tube portion is reflected by the reflector and passes through the tube portion again. It becomes possible to make the ratio of light smaller than in the case of a conventional light source device, and it is possible to suppress the occurrence of devitrification in the bulb portion.

  Moreover, in the light source device 110 according to the first embodiment, the fluorescent layer 26 is formed in the inner peripheral region R1 in the vicinity of the portion that holds the first sealing portion 14 in the reflection surface 24 of the reflector 20, so that it has been described above. The problem of the light source device described in JP 2007-52047 A is reduced, and the luminance of the light source device can be increased while suppressing the occurrence of devitrification in the bulb portion.

  Further, according to the light source device 110 according to the first embodiment, the outer peripheral shape of the inner peripheral region R1 is substantially circular, and has substantially the same size as the diameter of the tube portion 12 when viewed from the illuminated region side. Therefore, the area where the reflected light cannot be effectively used on the reflecting surface of the reflector becomes the inner peripheral area, and the problem of the light source device described in JP 2007-52047 A can be completely eliminated.

  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.

  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.

[Embodiment 2]
FIG. 3 is a diagram for explaining the light source device 112 according to the second embodiment. 3A is a cross-sectional view of the light source device 112, FIG. 3B is a view of the secondary mirror 30 as viewed from the tube portion 12, and FIG. 3C is a view of R2 in FIG. 3A. It is a figure which expands and shows the range.

  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 differs from the light source device 110 according to the first embodiment in that the light source device includes a secondary mirror. . That is, in the light source device 112 according to the second embodiment, as shown in FIG. 3, the reflector 30 out of the light emitted from the light emitting unit 13 is disposed in the second sealing portion 16 of the high pressure mercury lamp 10. It further includes a secondary mirror 60 that reflects part or all of light that is not directly incident toward the light emitting unit 13, and the reflective surface 64 of the secondary mirror 60 also contains a phosphor that absorbs ultraviolet light and emits visible light. A fluorescent layer 66 is formed.

  As shown in FIG. 3, the secondary mirror 60 has an opening 62 for inserting and fixing the second sealing portion 16 of the high-pressure mercury lamp 10 and the light emitted from the light emitting portion 13 toward the light emitting portion 13. And a reflective surface 64 for reflection. The secondary mirror 60 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 62. 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 64. On the inner surface of the reflecting surface 64, for example, a visible light reflecting layer made of a dielectric multilayer film of titanium oxide (TiO ₂ ) and silicon oxide (SiO ₂ ) is formed.

  On the reflecting surface 64 of the secondary mirror 60, a fluorescent layer 66 containing one kind of phosphor that absorbs ultraviolet light and emits red light is formed. The fluorescent layer 66 is formed on the entire reflecting surface 64 as shown in FIG.

  The fluorescent layer 66 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 64 using a spray method, an ink jet method, or the like. Further, the fluorescent layer 66 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 64.

  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 that it includes a secondary mirror, but the reflecting surface 34 of the reflector 30 absorbs ultraviolet light. Since the fluorescent layer 36 containing a phosphor that emits visible light is formed, as in the case of the light source device 110 according to the first embodiment, the reflector out of the ultraviolet light emitted from the light emitting unit and passing through the tube part. It is possible to make the ratio of the ultraviolet light reflected by and again passing through the bulb part smaller than in the case of the conventional light source device, and to suppress the occurrence of devitrification in the bulb part.

  In addition, according to the light source device 112 according to the second embodiment, since the fluorescent layer 66 containing the phosphor that absorbs ultraviolet light and emits visible light is also formed on the reflection surface 64 of the sub mirror 60, the light emitting unit It is possible to make the ratio of the ultraviolet light which is reflected from the secondary mirror and passes again through the tube part out of the ultraviolet light which is emitted from the tube part and smaller than that of the conventional light source device. It becomes possible to suppress the occurrence of devitrification.

  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 that the light source device 112 includes a secondary mirror. Of which, it has the relevant effect.

  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 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.

(2) 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.

(3) In each of the above embodiments, the fluorescent layer is formed only in the inner peripheral region in the vicinity of the portion of the reflecting surface of the reflector that holds the first sealing portion, but the present invention is limited to this. is not. The fluorescent layer may be partially formed in a region other than the inner peripheral region of the reflecting surface of the reflector. FIG. 4 is a view of the reflector 70 in the first modification viewed from the illuminated region side. FIG. 5 is a view of the reflector 80 in the second modification as seen from the illuminated region side. As shown in FIG. 4, the reflector 70 in the first modification has a fluorescent layer 78 formed concentrically in a region other than the inner peripheral region R <b> 1 on the reflection surface 74 of the reflector 70. As shown in FIG. 5, fluorescent layers 88 are radially formed in regions other than the inner peripheral region R <b> 1 on the reflecting surface 84 of the reflector 80. With such a configuration, it is possible to further reduce the ratio of removing ultraviolet light, and it is possible to further reduce the absorption of visible light and increase the luminance of the light source device.

(4) 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.

  In Embodiment 2 above, 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.

(5) In each of the above embodiments, the 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.

(6) 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.

(7) 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.

(8) 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.

(9) 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.

(10) 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, 20, 30, 70, 80 ... Reflector, 20ax, 30ax, 70ax, 80ax ... rotational symmetry axis, 22, 32, 72, 82 ... (reflector) opening, 24, 34, 74, 84 ... (reflector) reflecting surface, 60 ... secondary mirror, 62 ... (secondary mirror) opening, 64 ... (secondary mirror) reflecting surface, 26, 66, 76, 78, 86, 88 ... fluorescent layer, 42, 52 ... electrode, 44, 54 ... metal foil, 46, 56 ... lead wire, 90 ... concave lens, 100 DESCRIPTION OF SYMBOLS ... Illuminating device, 100ax ... Illumination optical axis, 110, 112 ... Light source device, 120 ... 1st lens array, 122 ... 1st small lens, 130 ... 2nd lens array, 132 ... 2nd small lens, 140 ... Polarization conversion element 150 superimposing lens 200 Color separation light guide optical system, 210, 220 ... Dichroic mirror, 230, 240, 250 ... Reflection mirror, 260 ... Incident side lens, 270 ... Relay lens, 300R, 300G, 300B ... Condensing lens, 400R, 400G, 400B ... Liquid crystal device, 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 light source device including a reflector disposed in a predetermined first sealing portion of the pair of sealing portions and reflecting light emitted from the light emitting portion toward an illuminated region;
Fluorescence that absorbs ultraviolet light and emits visible light in the inner peripheral region in the vicinity of the portion holding the first sealing portion of the reflecting surface of the reflector when the reflector is viewed from the illuminated region side. A light source device comprising a fluorescent layer containing a body. The light source device according to claim 1,
The outer peripheral shape of the inner peripheral region is substantially circular, and has the same size as the diameter of the tube portion when viewed from the illuminated region side. The light source device according to claim 1 or 2,
The light source device, wherein the phosphor emits red light as fluorescence. The light source device according to claim 1,
The phosphor layer contains two or more kinds of phosphors as the phosphor. In the light source device in any one of Claims 1-4,
The light source device according to claim 1, wherein the fluorescent layer is partially formed in a region other than the inner peripheral region of the reflecting surface of the reflector. In the light source device according to any one of claims 1 to 5,
Of the light emitted from the light emitting part, part or all of the light that is not directly incident on the reflector is disposed in a second sealing part that is different from the first sealing part among the pair of sealing parts. A light source device further comprising a secondary mirror that reflects the light toward the light emitting unit. The light source device according to claim 6,
A light source device characterized in that a fluorescent layer containing a phosphor that absorbs ultraviolet light and emits visible light is also formed on the reflection surface of the sub 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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