JP2004354676A - Light source device and projector - Google Patents

Abstract

Provided is a light source device and a projector capable of improving light use efficiency.
A reflector (12) constituting a light source device (10) has a first reflection surface (121B1) having a first reflection surface (121B1) that reflects visible light in a light beam emitted from a light source lamp (11) and transmits light of a specific wavelength other than visible light. It includes a first reflector 121 having a concave shape, and a second reflector 122 having a substantially concave cross section so as to cover the outer periphery of the first reflector 121. The second reflector 122 includes a phosphor 122B that converts the specific wavelength light transmitted through the first reflection surface 121B1 into visible light, reflects the visible light converted by the phosphor 122B, and converts the visible light into the first light. A second reflecting surface 122A for guiding light to the concave tip portion of the reflector while reflecting the light between the reflecting surface and the reflecting surface 121B1 is provided.
[Selection] Figure 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a light source including: a light emitting unit in which discharge light emission is performed between electrodes; a light emitting tube having sealing portions provided on both sides of the light emitting unit; and a reflector that reflects a light beam emitted from the light emitting tube. The present invention relates to an apparatus and a projector.
[0002]
[Background Art]
2. Description of the Related Art Conventionally, a light emitting tube having a light emitting portion in which discharge light emission is performed between electrodes, and sealing portions provided on both sides of the light emitting portion, and a reflector for fixing the light emitting tube and reflecting a light beam emitted from the light emitting tube There is known a light source device having the following.
In this light source device, a cold mirror that reflects visible light and transmits light of a specific wavelength other than visible light has been used as the reflector. In such a configuration, only the visible light component of the luminous flux emitted from the arc tube is used, so that the light use efficiency is low.
Then, in order to increase the utilization efficiency of the luminous flux emitted from the arc tube, the following light source device has been proposed (for example, see Patent Document 1).
In this light source device, the reflector is formed in a bowl shape having a light source storage space, and includes the above-described cold mirror. Further, a phosphor for converting light of a specific wavelength into visible light is applied to the outer peripheral surface of the reflector, and a reflective film for reflecting visible light is laminated on the phosphor.
The luminous flux emitted from the arc tube is reflected by a cold mirror, and visible light is reflected. At the same time, light of a specific wavelength transmitted through the cold mirror is converted into visible light by a phosphor, reflected by a reflective film, and reflected by a light source. It is injected into the storage space.
With such a configuration, not only the visible light component but also the light of a specific wavelength can be used in the light flux emitted from the arc tube, and the light use efficiency is improved.
[0003]
[Patent Document 1]
JP 2001-272725 A ([0015] paragraph, FIG. 2)
[0004]
[Problems to be solved by the invention]
However, in the above-described configuration, since the cold mirror is used as the reflector, the visible light converted by the phosphor and reflected by the reflection film is not emitted into the light source storage space and is reflected by the cold mirror. It is thought that.
Therefore, the above-described light source device cannot use light of a specific wavelength transmitted through the reflector, and cannot be said to be able to improve the light use efficiency.
[0005]
An object of the present invention is to provide a light source device and a projector that can improve light use efficiency.
[0006]
[Means for Solving the Problems]
The light source device according to the present invention includes a light emitting unit in which discharge light emission is performed between electrodes, a light emitting tube having sealing portions provided on both sides of the light emitting unit, and a reflector that reflects a light beam emitted from the light emitting tube. The light source device, wherein the reflector has a substantially concave cross-section having a first reflection surface that reflects a visible light out of a light flux emitted from the arc tube and transmits a specific wavelength light other than the visible light. A first reflector, and a second reflector formed in a substantially concave cross-section so as to cover the outer periphery of the first reflector, wherein the second reflector converts the specific wavelength light transmitted through the first reflection surface into visible light. A light converting unit for converting, and the visible light converted by the light converting unit is reflected, and the visible light is guided to the concave tip portion of the reflector while reflecting the visible light mutually between the first reflecting surface. A second reflecting surface is provided. It is characterized in.
[0007]
Here, as the arc tube, various arc tubes that emit light with high luminance can be used, and for example, a metal halide lamp, a high-pressure mercury lamp, or the like can be used.
As the first reflector, for example, a parabolic reflector, an elliptical reflector, or the like can be employed.
Further, the second reflector may have a substantially concave cross-sectional shape, such as a shape similar to the first reflector or a shape in which the opening ratio of the concave opening portion is larger than the first reflector. May be adopted. In addition, the second reflector and the first reflector may be spaced apart from each other with a predetermined gap, or a configuration in which a light transmitting member is interposed between these members may be adopted.
Furthermore, the light conversion part and the second reflection surface can adopt, for example, a configuration provided on the concave inner surface of the second reflector. When the second reflector is formed of a light-transmitting member, for example, a configuration in which the light conversion unit and the second reflection surface are provided on the concave outer surface of the second reflector, or the light conversion unit is formed in a concave inner surface. A configuration in which the second reflection surface is provided on the side surface and the second reflection surface is provided on the concave outer surface may be employed. Further, the light conversion portion and the second reflection surface are not limited to the configuration provided over the entire concave inner surface or the concave outer surface of the second reflector, but may be provided on a part of the concave inner surface or the concave outer surface of the second reflector. The configuration provided can also be adopted.
[0008]
According to the present invention, the light conversion unit converts the specific wavelength light transmitted through the first reflection surface of the first reflector into visible light, and converts the visible light converted by the light conversion unit into the first reflection light on the second reflection surface. The light is guided while being mutually reflected between the surface and the light, and can be emitted from the concave tip portion of the reflector. Therefore, in the light beam emitted from the arc tube, not only the visible light component reflected by the first reflector but also the specific wavelength light transmitted by the first reflector can be used, and the light use efficiency can be ensured. Can be improved.
In addition, since the visible light converted by the light conversion unit is emitted from the concave tip portion of the reflector, the brightness of the peripheral portion far from the illumination optical axis of the emitted light beam is reduced as compared with the conventional light source device. Can be higher.
[0009]
The light source device according to the present invention includes a light emitting unit in which discharge light emission is performed between electrodes, a light emitting tube having sealing portions provided on both sides of the light emitting unit, and a reflector that reflects a light beam emitted from the light emitting tube. The light source device, wherein the reflector has a substantially concave cross-section having a first reflection surface that reflects a visible light out of a light flux emitted from the arc tube and transmits a specific wavelength light other than the visible light. A first reflector, and a second reflector formed in a substantially concave cross-section so as to cover the outer periphery of the first reflector, wherein the second reflector receives light of a specific wavelength transmitted through the first reflecting surface of the reflector. A second reflection surface that reflects toward the concave tip portion, and a light conversion unit that is located on the optical path of the specific wavelength light emitted from the second reflection surface, converts the specific wavelength light into visible light, and emits the visible light. It is noted that To.
[0010]
Here, as the arc tube and the first reflector, those similar to the arc tube and the first reflector described above can be employed.
The shape of the second reflector can be the same as the shape of the above-described second reflector. Here, the second reflector and the first reflector may be spaced apart from each other with a predetermined gap in the same manner as in the above-described light source device, and a light transmitting member is interposed between these members. May be adopted.
Further, the second reflecting surface may reflect toward the concave tip portion of the reflector, and for example, a configuration in which the second reflecting surface reflects on the concave tip portion between the first reflector and the second reflector can be adopted. And the number of arrangements is not particularly limited. For example, a configuration can be employed in which the second reflection surface is provided on the concave inner side surface or the concave outer side surface of the second reflector.
Furthermore, the light conversion unit may be located on the optical path of the specific wavelength light emitted from the second reflection surface. For example, it is possible to adopt a configuration provided over the entire circumference of the concave tip portion between the first reflector and the second reflector.
[0011]
According to the present invention, the specific wavelength light transmitted through the first reflecting surface of the first reflector at the second reflecting surface is reflected toward the concave tip portion of the reflector, and emitted from the second reflecting surface at the light conversion unit. The specific wavelength light can be converted into visible light, and can be emitted from, for example, a surface of the light conversion unit opposite to the specific wavelength light incident surface. Therefore, in the light beam emitted from the arc tube, not only the visible light component reflected by the first reflector but also the specific wavelength light transmitted by the first reflector can be used, and the light use efficiency can be ensured. Can be improved.
In addition, since the visible light converted by the light conversion unit is emitted from the concave tip portion of the reflector, the brightness of the peripheral portion far from the illumination optical axis of the emitted light beam is reduced as compared with the conventional light source device. Can be higher.
[0012]
In the light source device according to the aspect of the invention, it is preferable that the first reflector and the second reflector are spaced apart from each other with a predetermined gap through which cooling air from the outside can flow.
According to the present invention, the first reflector and the second reflector are spaced apart from each other with a predetermined gap therebetween. For example, if a cooling fan or the like is arranged on the side of the light source device, air is blown from the cooling fan. Cooling air can flow between the first reflector and the second reflector. Therefore, the cooling efficiency of the light source device can be improved as compared with a structure in which the first reflector and the second reflector are in close contact with each other.
[0013]
A projector according to the present invention includes a light source device described above, a light modulation device that modulates a light beam emitted from the light source device according to image information, and a projection optical device that enlarges and projects the light beam modulated by the light modulation device. And characterized in that:
According to the present invention, since the light source device described above is provided, the same operation and effect as those of the light source device described above can be enjoyed.
In addition, since the light use efficiency can be improved by the light source device described above, a clearer image can be projected.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[Projector configuration]
FIG. 1 is a schematic diagram showing an optical system of a projector 1 on which a light source device according to the present invention is mounted.
The projector 1 modulates a light beam emitted from a light source according to image information to form an optical image, and enlarges and projects the optical image on a screen. The projector 1 includes a light source device 10, a uniform illumination optical system 20, a color separation optical system 30, a relay optical system 35, an optical device 40, and a projection lens 50 as a projection optical device. The optical elements constituting the optical systems 20 to 35 are positioned and adjusted and stored in the light guide 2 in which a predetermined illumination optical axis A is set.
[0015]
The light source device 10 emits a light beam emitted from the light source lamp 11 in a uniform direction and illuminates the optical device 40. As will be described in detail later, as shown in FIG. It comprises a lamp 11, a reflector 12, and a parallelizing concave lens 13.
The light beam emitted from the light source lamp 11 is emitted as convergent light toward the front side of the apparatus by the reflector 12, collimated by the collimating concave lens 13, and emitted to the uniform illumination optical system 20.
[0016]
The uniform illumination optical system 20 divides the light beam emitted from the light source device 10 into a plurality of partial light beams, and makes the in-plane illuminance of the illumination area uniform. As shown in FIG. 1, the uniform illumination optical system 20 includes a first lens array 21, a second lens array 22, a polarization conversion element 23, a superimposing lens 24, and a reflection mirror 25.
The first lens array 21 has a function as a light beam splitting optical element that splits the light beam emitted from the light source lamp 11 into a plurality of partial light beams, and is arranged in a matrix in a plane orthogonal to the illumination optical axis A. It comprises a plurality of small lenses.
The second lens array 22 is an optical element that collects a plurality of partial light beams split by the first lens array 21 described above, and has a matrix in a plane orthogonal to the illumination optical axis A, like the first lens array 21. Although the configuration is provided with a plurality of small lenses arranged in a shape, the contour shape of each small lens corresponds to the shape of the image forming area of the liquid crystal panels 42R, 42G, and 42B for the purpose of focusing. No need.
[0017]
The polarization conversion element 23 aligns the polarization direction of each partial light beam split by the first lens array 21 to linear polarization in one direction.
Although not shown, the polarization conversion element 23 has a configuration in which polarization separation films and reflection mirrors arranged obliquely with respect to the illumination optical axis A are alternately arranged. The polarization separation film transmits one of the P-polarized light beam and the S-polarized light beam included in each partial light beam and reflects the other polarized light beam. The other polarized light beam reflected is bent by the reflection mirror, and is emitted in the emission direction of one polarized light beam, that is, in the direction along the illumination optical axis A. One of the emitted polarized light beams is subjected to polarization conversion by a phase difference plate provided on the light beam exit surface of the polarization conversion element 23, and the polarization directions of all polarized light beams are aligned. By using such a polarization conversion element 23, the light beam emitted from the light source lamp 11 can be made uniform in one direction, so that the utilization rate of the light source light used in the optical device 40 can be improved. it can.
[0018]
The superimposing lens 24 is an optical element that condenses a plurality of partial luminous fluxes that have passed through the first lens array 21, the second lens array 22, and the polarization conversion element 23 and superimposes them on the image forming areas of the liquid crystal panels 42R, 42G, and 42B. It is. In the present embodiment, the superimposing lens 24 is a spherical lens in which the incident side end face of the light beam transmitting region is flat and the exit side end face is spherical, but an aspherical lens can also be used.
The light beam emitted from the superimposing lens 24 is bent by the reflection mirror 25 and emitted to the color separation optical system 30.
[0019]
The color separation optical system 30 includes two dichroic mirrors 31 and 32 and a reflection mirror 33, and converts a plurality of partial light beams emitted from the uniform illumination optical system 20 from the dichroic mirrors 31 and 32 into red (R), It has a function of separating into three color lights of green (G) and blue (B).
The dichroic mirrors 31 and 32 are optical elements formed on a substrate with a wavelength selection film that reflects a light beam in a predetermined wavelength region and transmits a light beam of another wavelength. , A mirror that transmits red light and reflects other color lights. The dichroic mirror 32 disposed downstream of the optical path is a mirror that reflects green light and transmits blue light.
[0020]
The relay optical system 35 includes an incident side lens 36, a relay lens 38, and reflection mirrors 37 and 39, and has a function of guiding blue light transmitted through the dichroic mirror 32 constituting the color separation optical system 30 to the optical device 40. Have. The reason why such a relay optical system 35 is provided in the optical path of the blue light is that the optical path length of the blue light is longer than the optical path lengths of the other color lights, so that the light use efficiency is reduced due to the divergence of the light. This is to prevent In this example, the configuration is such that the optical path length of blue light is long, but a configuration in which the optical path length of red light is increased is also conceivable.
[0021]
The red light separated by the above-described dichroic mirror 31 is supplied to the optical device 40 via the field lens 41 after being bent by the reflection mirror 33. The green light separated by the dichroic mirror 32 is supplied to the optical device 40 via the field lens 41 as it is. Further, the blue light is condensed and bent by the lenses 36 and 38 and the reflection mirrors 37 and 39 constituting the relay optical system 35, and is supplied to the optical device 40 via the field lens 41. In addition, the field lens 41 provided before the optical path of each color light of the optical device 40 is provided to convert each partial light beam emitted from the second lens array 22 into a light beam parallel to the illumination optical axis. I have.
[0022]
The optical device 40 modulates an incident light beam according to image information to form a color image, and includes a liquid crystal panel 42 as a light modulation device to be illuminated and a cross dichroic prism 43 as a color combining optical system. And is provided. An incident-side polarizing plate 44 is interposed between the field lens 41 and each of the liquid crystal panels 42R, 42G, and 42B, and is not shown in the figure, but between the liquid crystal panels 42R, 42G, and 42B and the cross dichroic prism 43. An exit-side polarizing plate is interposed therebetween, and the incident-side polarizing plate 44, the liquid crystal panels 42R, 42G, 42B, and the exit-side polarizing plate modulate the light of each color light incident thereon.
[0023]
The liquid crystal panels 42R, 42G, and 42B are formed by sealing and enclosing a liquid crystal, which is an electro-optical material, in a pair of transparent glass substrates. The polarization direction of the polarized light beam emitted from the plate 44 is modulated. The image forming area for modulating the liquid crystal panels 42R, 42G, and 42B is rectangular, and has a diagonal dimension of, for example, 0.7 inches.
[0024]
The cross dichroic prism 43 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the emission-side polarizing plate. The cross dichroic prism 43 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 an interface where the right-angle prisms are bonded together. One of the substantially X-shaped dielectric multilayer films reflects red light, and the other dielectric multilayer film reflects blue light. These dielectric multilayer films reflect red light and blue light. The light is bent and aligned with the traveling direction of the green light, so that the three color lights are combined.
The color image emitted from the cross dichroic prism 43 is enlarged and projected by the projection lens 50 to form a large screen image on a screen (not shown).
[0025]
[Configuration of light source device]
FIG. 2 is a cross-sectional view schematically illustrating the light source device 10.
As shown in FIG. 2, the light source device 10 includes an explosion-proof glass 14 for closing the concave opening of the reflector 12, in addition to the light source lamp 11, the reflector 12, and the parallelizing concave lens 13. The light source device 10 is entirely housed and held by a lamp housing (not shown), and is disposed at a predetermined position of the light guide 2 of the projector 1. Although not shown in FIG. 1, the projector 1 includes a cooling fan disposed adjacent to the light source device 10, and the cooling fan blows cooling air toward the light source device 10.
[0026]
The light source lamp 11 is formed of a quartz glass tube whose central portion is bulged in a spherical shape.
Although not shown in FIG. 2, a pair of tungsten electrodes spaced apart from each other by a predetermined distance, mercury, a rare gas, and a small amount of halogen are sealed inside the light emitting unit 111.
A metal foil made of molybdenum that is electrically connected to the electrode of the light emitting unit 111 is inserted into the inside of the sealing unit 112 and sealed with a glass material or the like. A lead wire (not shown) as an electrode lead wire is further connected to the metal foil. When a voltage is applied to the lead wire, a discharge occurs between the electrodes, and the light emitting unit 111 emits light.
[0027]
The reflector 12 is configured as an elliptical reflecting mirror, and includes a first reflector 121 and a second reflector 122.
The first reflector 121 is an integrally molded product made of glass having a neck portion 121A through which the sealing portion 112 of the light source lamp 11 is inserted, and an elliptical curved reflecting portion 121B extending from the neck portion 121A.
An insertion hole 121A1 is formed in the center of the neck portion 121A, and the sealing portion 112 is disposed at the center of the insertion hole 121A1.
The reflecting portion 121B has a first reflecting surface 121B1 formed by vapor-depositing a metal thin film on the entire inner surface of the elliptical curved surface, and the first reflecting surface 121B1 reflects visible light and emits light other than visible light. It is a cold mirror that transmits light of a specific wavelength (for example, infrared light or ultraviolet light). The light emission center of the light emitting unit 111 of the light source lamp 11 is arranged at the first focal position L1 of the first reflection surface 121B1. In the light beam emitted from the light emitting unit 111, the visible light component is reflected by the first reflecting surface 121B1 of the reflecting unit 121B, and converges to a second focal position (not shown) of the first reflecting surface 121B1. Is transmitted through the first reflection surface 121B1.
[0028]
FIG. 3 is an enlarged view of a part of FIG. 2 and is a cross-sectional view for explaining the structure of the second reflector 122 in the first embodiment.
The second reflector 122 converts the specific wavelength light transmitted through the first reflecting surface 121B1 of the first reflector 121 into visible light and emits it. The second reflector 122 is formed in an elliptical curved shape similarly to the reflection part 121B of the first reflector 121. As shown in FIG. 2, the second reflector 122 covers the outer periphery of the first reflector 121, is spaced apart from the first reflector 121 by a predetermined gap, and serves to cool cooling air blown from the outside. The first reflector 121 is fixed to the neck 121A of the first reflector 121 so as to be able to flow. That is, although not shown, in the second reflector 122, a plurality of openings are formed in a portion where the first reflector 121 is fixed to the neck portion 121A, and cooling air from the outside is discharged through the openings. It is possible to circulate between the first reflector 121 and the second reflector 122.
Note that, like the first reflector 121, the second reflector 122 may be formed as a molded product made of glass, or may be formed of another member such as a metal.
[0029]
As shown in FIG. 2 or FIG. 3, on the entire inner surface of the elliptical curved surface of the second reflector 122, a second reflecting surface 122A formed by vapor deposition of a metal thin film, and a second reflecting surface 122A And a phosphor 122B (fluorescent paint) as a light conversion unit.
Similarly to the first reflecting surface 121B1, the second reflecting surface 122A is a cold mirror that reflects visible light and transmits light of a specific wavelength other than visible light.
The phosphor 122B converts light of a specific wavelength (for example, infrared light or ultraviolet light) into visible light. Various phosphors can be employed as the phosphor 122B. For example, halophosphate phosphor, phosphate phosphor, silicate phosphor, tungstate phosphor, aluminate phosphor, borate phosphor. Body, sulfide phosphor, oxysulfide phosphor, germanate phosphor, or the like.
[0030]
Here, in the light beam emitted from the light emitting unit 111, as described above, the visible light component is reflected by the first reflection surface 121B1 of the first reflector 121, and light of a specific wavelength other than visible light is transmitted. Then, as shown in FIG. 3, the specific wavelength light transmitted through the first reflecting surface 121B1 is incident on the phosphor 122B of the second reflector 122 and is converted into visible light. The converted visible light is emitted forward from the distal end opening between the first reflector 121 and the second reflector 122 while repeating reflection between the second reflection surface 122A and the first reflection surface 121B1.
The explosion-proof glass 14 has a planar shape substantially the same as the planar shape of the opening of the reflector 12, and is fixed to the distal end portions of the first reflector 121 and the second reflector 122. As the explosion-proof glass 14, for example, high heat-resistant glass can be adopted.
[0031]
[Effects of First Embodiment]
According to the above-described first embodiment, the following effects can be obtained.
(1) The first reflecting surface 121B1 of the first reflector 121 reflects a visible light component of the light flux emitted from the light source lamp 11, and transmits light of a specific wavelength other than visible light. Since the second reflecting surface 122A and the phosphor 122B are laminated on the inner surface of the elliptical curved surface of the second reflector 122, the specific wavelength light transmitted through the first reflecting surface 121B1 is visible by the phosphor 122B. The light is converted into light, and the visible light can be emitted forward from the distal end opening between the first reflector 121 and the second reflector 122 while being reflected between the second reflection surface 122A and the first reflection surface 121B1. Therefore, in the light flux emitted from the light source lamp 11, not only the visible light component but also the light of the specific wavelength can be used, and the light use efficiency can be surely improved.
[0032]
(2) The visible light converted by the phosphor 122B is emitted from the distal end opening between the first reflector 121 and the second reflector 122, and thus emitted from the light source device 10 as compared with the conventional light source device. In the light beam to be emitted, the brightness of a peripheral portion of the light beam that is remote from the illumination optical axis can be increased.
(3) Since the first reflector 121 and the second reflector 122 are spaced apart from each other with a predetermined gap, the cooling air blown from an external cooling fan flows between the first reflector 121 and the second reflector 122. Can be done. Therefore, the cooling efficiency of the light source device 10 can be improved as compared with the structure in which the first reflector 121 and the second reflector 122 are in close contact.
(4) Since the projector 1 includes the light source device 10 described above, a clearer image can be projected from the projection lens 50 toward the screen.
[0033]
[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings.
In the following description, the same structures and the same members as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted or simplified.
In the first embodiment, in the light source device 10, the second reflector 122 converts the specific wavelength light transmitted through the first reflector 121 into visible light by the phosphor 122B. Then, the visible light is guided while being reflected between the second reflection surface 122A and the first reflection surface 121B1 of the first reflector 121, and is forwardly transmitted from the front end opening between the first reflector 121 and the second reflector 122. A reflective structure that emits to the side is employed.
On the other hand, in the second embodiment, the first reflection surface 222A of the second reflector 222 directs the specific wavelength light transmitted through the first reflector 121 toward the distal end opening between the first reflector and the second reflector 222. Reflect. Then, a transmission type structure is employed in which the reflected specific wavelength light is made incident on the phosphor 222B, and the converted visible light is emitted forward from the surface opposite to the incident surface. Other configurations are the same as in the first embodiment.
[0034]
Specifically, FIG. 4 is a cross-sectional view for explaining the structure of the second reflector 222 in the second embodiment.
Although not shown, the second reflector 222 is formed in an elliptical curved shape like the second reflector 122 of the first embodiment, covers the outer periphery of the first reflector 121, and has a predetermined shape with respect to the first reflector 121. The first reflector 121 is fixed to the neck 121A (FIG. 2) of the first reflector 121 so as to allow cooling air blown from the outside to flow therethrough with a gap therebetween. As shown in FIG. 4, a plurality of second reflecting surfaces 222A and phosphors 222B are provided on the inner surface of the elliptical curved surface of the second reflector 222.
[0035]
A plurality of second reflecting surfaces 222A are provided, each of which is formed in a substantially frame shape in plan view that is symmetrical about the axis of the elliptical curved surface. The second reflection surface 222 </ b> A is configured as a mirror that reflects light of a specific wavelength (for example, infrared light or ultraviolet light), and the reflected light is emitted toward the distal end opening between the first reflector 121 and the second reflector 222. It is set as follows.
The phosphor 222B is provided so as to close the opening at the tip end between the first reflector 121 and the second reflector 222, converts incident specific wavelength light into visible light, and is provided on the opposite side of the incident surface of the specific wavelength light. Emit visible light from the surface. The phosphor 222B can be made of the same material as the phosphor 122B of the first embodiment.
Here, the luminous flux emitted from the light emitting unit 111 (FIG. 2) of the light source lamp 11 is reflected by the first reflection surface 121B1 of the first reflector 121, as in the first embodiment, and the visible light component is reflected. Other specific wavelength light is transmitted. Then, as shown in FIG. 4, the specific wavelength light transmitted through the first reflecting surface 121 </ b> B <b> 1 passes through the second reflecting surface 222 </ b> A of the second reflector 222 at the tip end opening between the first reflector 121 and the second reflector 222. Reflected toward. Further, the specific wavelength light reflected on the second reflecting surface 222A is converted into visible light by the fluorescent material 222B installed at the tip end opening between the first reflector 121 and the second reflector 222, and the specific wavelength light From the surface on the opposite side to the incident surface.
[0036]
[Effect of Second Embodiment]
According to the second embodiment described above, the following effects are obtained in addition to the effects similar to the above (2) to (4).
(5) The first reflecting surface 121B1 of the first reflector 121 reflects a visible light component of the light flux emitted from the light source lamp 11, and transmits light of a specific wavelength other than visible light. Since the second reflector 222 is provided on the inner surface of the elliptical curved surface with the second reflector 222A and the phosphor 222B, the specific wavelength light transmitted through the first reflector 121B1 is transmitted to the second reflector 222A. Reflected by the tip end opening between the first reflector 121 and the second reflector 222, and the specific wavelength light emitted from the second reflection surface 222A by the phosphor 222B is converted into visible light. It can be emitted forward from the surface opposite to the surface. Therefore, in the light flux emitted from the light source lamp 11, not only the visible light component but also the light of the specific wavelength can be used, and the light use efficiency can be surely improved.
[0037]
(Modification of embodiment)
As described above, the present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the gist of the present invention. It is.
In the above embodiments, the light source lamp 11 is a high-pressure mercury lamp in which mercury is sealed in the light emitting unit 111. However, the present invention is not limited to this, and the present invention may be applied to a metal halide lamp.
In the above embodiments, the first reflector 121 is configured as an elliptical reflector, but is not limited thereto, and may be configured as a parabolic reflector.
[0038]
In each of the above embodiments, the second reflectors 122 and 222 are configured to have a similar relationship to the shape of the first reflector 121, and are configured to have substantially the same separation distance from the first reflector 121. However, it is not limited to this. For example, the shape of the second reflectors 122 and 222 is set so that the opening of the elliptical curved surface is wider than the other portions of the first reflector 121, and the separation distance from the first reflector 121 is the tip portion. The shape may become larger as going toward.
For example, if this shape is adopted in the first embodiment, the visible light repeatedly reflected between the second reflecting surface 122A of the second reflector 122 and the first reflecting surface 121B1 of the first reflector 121 can be reflected by the first reflector. Light is easily guided to the opening at the tip end between the first reflector 121 and the second reflector 122.
Also, for example, if this shape is adopted in the second embodiment, the specific wavelength light is directed to the distal end opening between the first reflector 121 and the second reflector 222 by the second reflection surface 222A of the second reflector 222. Easy to reflect.
[0039]
In each of the above embodiments, the first reflector 121 and the second reflectors 122 and 222 are spaced apart from each other with a predetermined gap. However, a configuration in which a light transmitting member is interposed between these members is adopted. May be.
In the first embodiment, the first reflecting surface 122A and the phosphor 122B are provided on the inner surface of the elliptical curved surface of the second reflector 122. However, the present invention is not limited to this. Only the phosphor 122B is provided on the second reflector 122. May be provided on the inner surface of the elliptical curved surface, and the first reflecting surface 122A may be provided on the outer surface of the elliptical curved surface of the second reflector 122. Further, the first reflection surface 122A and the phosphor 122B are not limited to the configuration provided over the entire elliptical inner surface or outer surface of the second reflector 122, but may be provided on the elliptical inner surface of the second reflector 122. Alternatively, a configuration provided on a part of the outer surface may be employed.
[0040]
In the second embodiment, the second reflecting surface 222A only needs to reflect toward the tip of the reflector 12, and the arrangement position and the number of arrangements are not particularly limited. For example, a configuration in which the second reflecting surface 222A is provided on the elliptical curved outer surface of the second reflector 222 can be adopted. Also, the phosphor 222B may be disposed on the optical path of the specific wavelength light emitted from the second reflection surface 222A, and is located at a position between the first reflector 121 and the second reflector 222 that closes the opening at the tip end. Not exclusively. For example, when the second reflection surface 222A reflects a light beam toward the elliptical curved tip of the second reflector 222, the phosphor 222B may be disposed at the elliptical curved tip of the second reflector 222. .
[0041]
In the second embodiment, an opening through which cooling air from the outside can flow may be appropriately provided in a portion of the second reflector 222 where the second reflection surface 222A is not provided. With such a configuration, more cooling air can flow between the first reflector 121 and the second reflector 222, and the cooling efficiency of the light source device 10 can be further improved.
[0042]
In each of the above embodiments, the first reflector 121 and the second reflectors 122 and 222 are positioned between the first reflector 121 and the second reflectors 122 and 222 such that the visible light reflected on the first reflecting surface 121B1 of the first reflector 121 converges on a second focal position (not shown). May be provided with a light condensing means for converging the visible light emitted from the front end portion opening at the second focal position (not shown). For example, in the explosion-proof glass 14, a portion facing the front end portion opening between the first reflector 121 and the second reflectors 122 and 222 may be configured as a light collecting unit. The light collecting means is not particularly limited. For example, a single lens such as a biconvex lens, a plano-convex lens, a meniscus lens having a positive refractive power, and a combination of these single lenses and a single lens such as a biconcave lens and a plano-concave lens In addition, a combination lens having a positive refractive power as a whole can be employed.
[0043]
In each of the above embodiments, only an example of a projector using three light modulation devices has been described. However, the present invention relates to a projector using one or two light modulation devices, or a projector using four or more light modulation devices. It is also applicable to the projector used.
In each of the embodiments, the transmission type light modulator in which the light incidence surface and the light emission surface are different is used. However, the reflection type light modulation device in which the light incidence surface and the light emission surface are the same may be used. Good.
In each of the above embodiments, only the example of the front type projector that performs projection from the direction of observing the screen has been described, but the present invention is also applicable to a rear type projector that performs projection from the opposite side to the direction of observing the screen. Applicable.
In each of the above embodiments, the liquid crystal panels 42R, 42G, and 42B are employed as the light modulation devices. However, the present invention is not limited to this. Good.
[0044]
The best configuration for implementing the present invention has been disclosed in the above description, but the present invention is not limited to this. That is, the present invention has been particularly shown and described with particular reference to particular embodiments, but may be modified in form and form without departing from the spirit and scope of the invention. Those skilled in the art can make various modifications in terms of material, quantity, and other detailed configurations.
Therefore, the description of the shapes, materials, and the like disclosed above is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. The description by the name of the member excluding some or all of the limitations such as is included in the present invention.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an optical system of a projector equipped with a light source device according to the present invention.
FIG. 2 is a sectional view schematically showing the light source device according to the embodiment.
FIG. 3 is a diagram illustrating a structure of a second reflector according to the first embodiment.
FIG. 4 is a diagram illustrating a structure of a second reflector according to a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Projector, 10 ... Light source device, 11 ... Light source lamp (arc tube), 12 ... Reflector, 42 ... Liquid crystal panel (light modulator), 50 ... Projection lens (Projection) Optical device), 111: Light emitting unit, 112: Sealing unit, 121: First reflector, 121B1: First reflecting surface, 122, 222 ... Second reflector, 122A, 222A ..The second reflecting surface, 122B, 222B... Phosphor (light conversion unit).

Claims (4)

A light source device comprising: a light-emitting portion in which discharge light emission is performed between electrodes; a light-emitting tube having sealing portions provided on both sides of the light-emitting portion; and a reflector that reflects a light beam emitted from the light-emitting tube. ,
The reflector includes a first reflector having a substantially concave cross-section, having a first reflection surface that reflects visible light and transmits light of a specific wavelength other than visible light, out of the luminous flux emitted from the arc tube, and the first reflector. A second reflector formed in a substantially concave cross-section so as to cover the outer periphery of
The second reflector has a light conversion unit that converts the specific wavelength light transmitted through the first reflection surface into visible light, and reflects the visible light converted by the light conversion unit, and converts the visible light into the second light. A light source device, comprising: a first reflecting surface; and a second reflecting surface that guides light to a concave tip portion of the reflector while reflecting the light mutually. A light source device comprising: a light-emitting portion in which discharge light emission is performed between electrodes; a light-emitting tube having sealing portions provided on both sides of the light-emitting portion; and a reflector that reflects a light beam emitted from the light-emitting tube. ,
The reflector includes a first reflector having a substantially concave cross-section, having a first reflection surface that reflects visible light and transmits light of a specific wavelength other than visible light, out of the luminous flux emitted from the arc tube, and the first reflector. A second reflector formed in a substantially concave cross-section so as to cover the outer periphery of
The second reflector has a second reflection surface that reflects the specific wavelength light transmitted through the first reflection surface toward the concave tip portion of the reflector, and a light of the specific wavelength light emitted from the second reflection surface. A light conversion unit that is located on a road and converts the specific wavelength light into visible light and emits the light. The light source device according to claim 1 or 2,
The light source device according to claim 1, wherein the first reflector and the second reflector are spaced apart from each other with a predetermined gap through which cooling air from the outside can flow. A light source device according to any one of claims 1 to 3, a light modulation device that modulates a light beam emitted from the light source device according to image information, and a light beam modulated by the light modulation device. A projector, comprising: a projection optical device for projecting.

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