JP2004362971A - Light source device and projector equipped with same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device and a projector equipped with the same that prevents deterioration of illuminance in a illuminated area and of uniformity of illuminance to provide a high display image quality. <P>SOLUTION: The light source device 110 is equipped with an elliptic surface reflector 114 which is positioned and held in a light source lamp case 112 and has an opening on the illuminated area side, and an arc tube 116 which is disposed in the elliptic surface reflector 114 and emits illumination light. The light source lamp case 112 has a protrusion 113 for positioning which abuts with the inner surface of the elliptic surface reflector 114, and the elliptic surface reflector 114 is pressure-contacted to the protrusion 113 and biased to the illuminated area side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light source device and a projector including the same.
[0002]
[Prior art]
In a projector, the illumination light emitted from the illumination optical system is modulated according to image information using an electro-optic modulator such as a liquid crystal display device, and the modulated illumination light is projected on a projection surface such as a screen. To realize image display.
In such a projector, if the positional accuracy of each optical component constituting the illumination optical system is poor, the illuminance in the illuminated area and the uniformity of the illuminance are adversely affected. The light source device is required to have high positional accuracy.
For this reason, there has been known a conventional light source device in which a positioning portion of a reflector is pressed against a reference surface of a lamp housing to improve the positional accuracy of the reflector (for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Publication No. 2000-515311 (FIG. 2)
[0004]
[Problems to be solved by the invention]
However, in the light source device described above, since the outer surface of the reflector is pressed against the light source lamp housing, the positional accuracy of the reflector in the optical axis direction cannot be significantly improved. This is because, when the reflector is an elliptical mirror, the outer focal point of the two focal points located inside and outside the elliptical reflector is largely displaced in the optical axis direction due to a slight displacement of the elliptical reflector. Notable. As a result, there is a problem in that the illuminance is reduced or the illuminance uniformity is deteriorated in the illuminated area, and the display image quality is reduced.
[0005]
The present invention has been made in order to solve such a problem, and it is possible to suppress a decrease in illuminance and a deterioration in uniformity of illuminance in an illuminated area, and to thereby obtain a light source device capable of obtaining high display image quality. It is an object of the present invention to provide a projector provided with.
[0006]
[Means for Solving the Problems]
(1) A light source device according to the present invention is positioned and held by a light source lamp housing, and is provided with an elliptical reflector that opens to the illuminated area side, and light emission that is disposed in the elliptical reflector and emits illumination light. A light source device including a tube, wherein the light source lamp housing has a positioning convex portion abutting on the inner surface of the elliptical reflector, and the elliptical reflector is pressed against the convex portion and covered. It is characterized by being biased toward the illumination area.
[0007]
For this reason, according to the light source device of the present invention, in the state where the elliptical reflector is positioned and held with respect to the light source lamp housing, the inner surface of the elliptical reflector having high processing accuracy is pressed against the positioning projection in the light source lamp housing. In this case, since the occurrence of a shift in the optical axis direction at the outer focal point among the two focal points located inside and outside the elliptical reflector is reliably suppressed, the positional accuracy of the elliptical reflector in the optical axis direction is greatly improved.
Therefore, it is possible to suppress a decrease in the illuminance of the illuminated area and a deterioration in the uniformity of the illuminance, and to obtain high display image quality.
[0008]
(2) In the light source device according to the above (1), it is preferable that the convex portion is a convex portion that comes into contact with a non-reflective surface formed of a curved surface that is continuous with the reflective surface of the elliptical reflector.
With this configuration, the elliptical surface with extremely high processing accuracy is pressed against the positioning projection of the light source lamp housing, so that the position accuracy of the elliptical reflector in the optical axis direction is extremely high.
[0009]
(3) In the light source device according to the above (1), it is preferable that the convex portion is a convex portion that comes into contact with a non-reflective surface formed of a flat surface that is discontinuous with the reflective surface of the elliptical reflector.
The reflecting surface formed of a flat surface that is discontinuous to the reflecting surface of the elliptical reflector is usually formed from the same mold in the same process as the elliptical surface, and therefore has extremely high processing accuracy. For this reason, with such a configuration, a flat surface with extremely high processing accuracy is pressed against the positioning projection, so that the position accuracy of the elliptical reflector in the optical axis direction is extremely high.
Further, in this case, since the surface shape of the positioning convex surface can be made flat, there is also an effect that the processing of the positioning convex surface becomes easy.
[0010]
(4) In the light source device according to any one of (1) to (3), it is preferable that the convex portion is a convex portion that comes into contact with the inner surface of the elliptical reflector by surface contact.
With this configuration, the inner surface of the elliptical reflector is pressed against the positioning projection of the light source lamp housing by surface contact, so that high stability is obtained.
[0011]
(5) In the light source device according to any one of (1) to (3), it is preferable that the convex portion is a convex portion that comes into contact with the inner surface of the elliptical reflector by point contact.
With this configuration, since the inner surface of the elliptical reflector is pressed against the positioning projection of the light source lamp housing by point contact, the positional accuracy in the optical axis direction is extremely high.
[0012]
(6) In the light source device according to any one of the above (1) to (5), it is preferable that the protrusions include two or four protrusions.
With this configuration, the inner surface of the elliptical reflector is pressed against two or four positioning projections. In this case, it is easy to design the positioning convex portion outside the optical path of the illumination light.
[0013]
(7) A projector according to the present invention provides an illumination optical system that emits illumination light, a color separation optical system that separates illumination light emitted from the illumination optical system into a plurality of color lights, and a color separation optical system that separates the illumination light. A plurality of electro-optical modulators for modulating the respective color lights thus formed to form an image, a color synthesizing optical system for synthesizing the modulated lights emitted from the plurality of electro-optical modulators, and a color synthesizing optical system. And a projection optical system for projecting and displaying the obtained image on a projection surface, wherein the illumination optical system is an illumination optical system including the light source device according to any one of (1) to (6). It is characterized by the following.
[0014]
For this reason, the projector according to the present invention is a projector including the illumination optical system having the light source device in which the position accuracy of the elliptical reflector in the optical axis direction is greatly increased. This makes it possible to suppress the deterioration of the uniformity of the image and to suppress the deterioration of the display image quality.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a light source device to which the present invention is applied and a projector including the same will be described based on an embodiment shown in the drawings.
First, a first embodiment of the present invention will be described with reference to FIGS.
[0016]
[Embodiment 1]
FIG. 1 is a plan view showing an optical system of a projector including a light source device according to Embodiment 1 of the present invention. As shown in FIG. 1, a projector denoted by reference numeral 1 includes an illumination optical system 100, a color separation optical system 200, a relay optical system 300, three liquid crystal display devices 400R, 400G, 400B, and a cross dichroic prism 500. And a projection optical system 600. The components of each optical system are arranged substantially horizontally around the cross dichroic prism 500.
[0017]
The illumination optical system 100 includes a light source device 110, a collimating lens 118, a first lens array 120, a second lens array 130, a polarization conversion element 140, and a superposition lens 150. The luminous flux emitted from the light source device 110 is divided into a plurality of minute partial luminous fluxes by the first lens array 120, and each of the partial luminous fluxes is illuminated by the second lens array 130 and the superimposing lens 150 into three liquid crystal display devices to be illuminated. The light is superimposed on the light incident surfaces of 400R, 400G, and 400B.
[0018]
The light source device 110 generally includes a light source lamp housing 112, an elliptical reflector 114, and an arc tube 116 (see FIG. 2).
The collimating lens 118 is a concave lens, is disposed on the illuminated area side of the light source device 110, and is configured to collimate the illumination light from the elliptical reflector 114.
The first lens array 120 and the second lens array 130 are formed by arranging small lenses in a matrix.
The polarization conversion element 140 has a function of aligning non-polarized light with polarized light having a polarization direction that can be used in the three liquid crystal display devices 400R, 400G, and 400B.
[0019]
The color separation optical system 200 has a function of separating the illumination light emitted from the illumination optical system 100 into three colors of illumination light of different wavelength ranges. The first dichroic mirror 210 transmits substantially red light (hereinafter referred to as “R light”), and transmits substantially green light (hereinafter referred to as “G light”) and substantially blue light (hereinafter referred to as “B light”). Is reflected.) The R light transmitted through the first dichroic mirror 210 is reflected by the reflection mirror 230, passes through the field lens 240R, and illuminates the R liquid crystal display device 400R.
[0020]
The field lens 240R collects the plurality of partial light beams from the illumination optical system 100 so as to illuminate the liquid crystal display device 400R. Usually, each partial light beam is set to be a substantially parallel light beam. Field lenses 240G and 350 disposed in front of the other liquid crystal display devices 400G and 400B have the same configuration as the field lens 240R.
[0021]
The G light of the G light and the B light reflected by the first dichroic mirror 210 is further reflected by the second dichroic mirror 220, passes through the field lens 240G, and illuminates the G liquid crystal display device 400G. On the other hand, the B light passes through the second dichroic mirror 220, passes through the relay optical system 300, and illuminates the liquid crystal display device 400B for B.
[0022]
The relay optical system 300 includes an entrance lens 310, an entrance reflection mirror 320, a relay lens 330, an exit reflection mirror 340, and a field lens 350. The B light emitted from the color separation optical system 200 is converged by the incident side lens 310 near the relay lens 330 and diverges toward the field lens 350 (the exit side reflection mirror 340). The size of the light beam incident on the field lens 350 is set to be substantially equal to the size of the light beam incident on the incident side lens 310.
[0023]
The liquid crystal display devices 400R, 400G, and 400B for each color convert the color light incident on each light incident surface into light corresponding to a color signal (image signal) corresponding to each light, and convert the converted light into transmitted light. Inject as The incident side polarizing plates 918R, 918G, 918B are arranged on the incident side of these liquid crystal display devices 400R, 400G, 400B, and the exit side polarizing plates 920R, 920G, 920B are arranged on the exit side. Transmissive liquid crystal panels are used as the liquid crystal display devices 400R, 400G, and 400B.
[0024]
The cross dichroic prism 500 has a function as a color combining optical system that combines converted light of each color emitted from the liquid crystal display devices 400R, 400G, and 400B for each color. The combined light generated in the cross dichroic prism 500 is emitted toward the projection optical system 600.
[0025]
The projection optical system 600 has a plurality of projection lenses (not shown), and is configured to project and display the combined light from the cross dichroic prism 500 as a display image on a screen (not shown).
[0026]
FIG. 2 is a cross-sectional view illustrating the light source device according to Embodiment 1 of the present invention. FIG. 3 is an explanatory diagram of a main part of the light source device according to Embodiment 1 of the present invention as viewed from the front. FIG. 3A is an exploded perspective view, and FIG. 3B is an assembled perspective view. FIG. 4 is an explanatory diagram of a main part of the light source device according to Embodiment 1 of the present invention as viewed from the rear. FIG. 4A is an exploded perspective view, and FIG. 4B is an assembled perspective view. FIG. 5 is an explanatory diagram illustrating a main part of the light source device according to the first embodiment of the present invention. FIG. 5A is a side view thereof, and FIG. 5B is a rear view thereof. FIG. 6 is an explanatory diagram illustrating a light source lamp housing of the light source device according to the first embodiment of the present invention. FIG. 6A is a side view thereof, and FIG. 6B is a rear view thereof. Hereinafter, the light source device according to the first embodiment will be described in detail.
[0027]
As shown in FIG. 2, the light source device 110 generally includes a light source lamp housing 112, an elliptical reflector 114, and an arc tube 116.
The light source lamp housing 112 has a mounting base 112A and a mounting frame 112B as shown in FIGS. 2 to 6, and is disposed in a housing (not shown) for storing optical components. The mount 112A, the spring locking holes 112A ₁ which opens in the vertical direction (shown in FIG. 2) is provided. Mounting frame 112B has a protrusion 112B ₁ for spring locking in vertical and horizontal sides, a whole is formed by a substantially rectangular frame body. The front part of the mounting frame 112B, the front plate 112b having a circular window 112b ₁ which opens in the longitudinal direction is integrally provided.
[0028]
The front plate 112b, in parallel at equal intervals in the circumferential direction of the circular windows 112b _1, and the convex portions 113 of the four positioning projecting into the mounting frame 112B (rearward) is integrally provided. And it is comprised so that the inner surface of the ellipsoidal reflector 114 may be contacted. The convex portion 113 is formed with a slanted flat surface 113A that fits a non-reflective surface (described later) made of a flat surface that is discontinuous to the reflective surface of the elliptical reflector 114. Thus, in the elliptical reflector positioning and holding state, the flat surface 113A of the convex portion 113 is pressed against the inner surface of the elliptical reflector 114 with high processing accuracy by surface contact.
[0029]
As the ellipsoidal reflector 114, an ellipsoidal mirror that is open forward (toward the illuminated area) and is made of a spheroid symmetrical to the ellipsoidal reflector optical axis OC is used. Within the elliptical reflector 114, there are formed a reflecting surface 114A formed of an elliptical surface for reflecting the illumination light of the arc tube 116 and four non-reflecting surfaces 114B formed of a discontinuous flat surface on the reflecting surface 114A. In the elliptical reflector 114, the non-reflective surfaces 114B are pressed against the convex portions 113, and are urged toward the illuminated area by the spring 119. Thus, the elliptical reflector 114 is reliably positioned and held with respect to the light source lamp housing 112. Therefore, occurrence of optical axis deviation in the focus P ₂ of the outer one of the two focal P _1, P ₂ located in the ellipsoidal reflector and out is suppressed, enhancing the optical axis direction of the positional accuracy of the ellipsoidal reflector 114 Can be
[0030]
The spring 119 is formed of a leaf spring having a locking hole 119A and an engaging portion 119B, and is attached to the light source lamp housing 112. Engaging hole 119A is engaged with the projection 112B _1, engaging portion 119B is engaged with the edge of the opening peripheral edge or mounting frame 112B of the spring locking hole 112A ₁ elastically deformed.
The type, shape, and the like of the spring 119 are not particularly limited.
[0031]
The arc tube 116 is made of a high-pressure mercury lamp having a glass tube 116A made of quartz glass, the light emission center to match the focal point P ₁ is disposed on the ellipsoidal reflector 114. And it is comprised so that illumination light may be emitted.
Note that another arc tube such as a xenon lamp or a metal halide lamp may be used as the arc tube 116.
[0032]
With the configuration described above, in the light source device 110 according to the first embodiment and the projector 1 including the same, in the state where the elliptical reflector 114 is positioned and held with respect to the light source lamp housing 112, the inner surface ( The non-reflection surface 114B) comes into surface contact with the flat surface 113A of the positioning projection 113 in the light source lamp housing 112 and is pressed. Accordingly, since the occurrence of the optical axis deviation in the focus P ₂ outside of the ellipsoidal two focus P ₁ located inside and outside of the reflector _114, P ₂ is an ellipsoidal mirror can be reliably suppressed, ellipsoidal The positional accuracy of the reflector 114 in the direction of the optical axis is greatly improved.
Therefore, in the present embodiment, it is possible to suppress a decrease in the illuminance of the illuminated area and a deterioration in the uniformity of the illuminance, and to obtain high display image quality.
[0033]
Next, a second embodiment of the present invention will be described with reference to FIGS.
[Embodiment 2]
FIG. 7 is a cross-sectional view illustrating a light source device according to Embodiment 2 of the present invention. FIG. 8 is an explanatory diagram of a main part of the light source device according to Embodiment 2 of the present invention as viewed from the front. FIG. 8A is an exploded perspective view, and FIG. 8B is an assembled perspective view. FIG. 9 is an explanatory diagram of a main part of the light source device according to Embodiment 2 of the present invention as viewed from the rear. FIG. 9A is an exploded perspective view, and FIG. 9B is an assembled perspective view. FIG. 10 is an explanatory diagram illustrating a main part of a light source device according to Embodiment 2 of the present invention. FIG. 10A is a side view thereof, and FIG. 10B is a rear view thereof. FIG. 11 is an explanatory diagram showing a light source lamp housing of the light source device according to Embodiment 2 of the present invention. FIG. 11A is a side view thereof, and FIG. 11B is a rear view thereof. 7 to 11, the same members as those in FIGS. 2 to 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0034]
The light source device according to the second embodiment is characterized in that the positioning projection in the light source lamp housing is a projection that comes into contact with a non-reflection surface formed of a curved surface that is continuous with the reflection surface of the elliptical reflector.
Therefore, as in Embodiment 1, the front plate 112b of the light source lamp housing 112, in parallel at equal intervals in the circumferential direction of the circular windows 112b _1, and the mounting frame 112B 4 four projecting (rear) The convex portion 113 for positioning is provided integrally. And it is comprised so that the inner surface of the ellipsoidal reflector 112 may be contacted. As shown in FIGS. 7 to 11, the convex portion 113 has an elliptical surface 113 </ b> A ₁ that fits a non-reflective surface (described later) formed of a curved surface (elliptical surface) that is continuous with the reflective surface (elliptical surface) of the elliptical reflector 112. Is formed. Thus, the ellipsoidal reflector positioned and held state, ellipsoid 113A ₁ of the convex portion 113 is pressed in surface contact with the inner surface of the high processing accuracy ellipsoidal reflector 114.
[0035]
As the ellipsoidal reflector 114, an ellipsoidal mirror that is open forward (toward the illuminated area) and is made of a spheroid symmetrical to the ellipsoidal reflector optical axis OC is used. The ellipsoidal reflector 114, four non-reflective surface 114B ₁ of the illumination light consisting of an ellipsoid continuous to the reflecting surface 114A ₁ and the reflective surface 114A ₁ consists elliptical surface for reflecting the light emitting tube 116 is formed . The ellipsoidal reflector 114 is biased by a spring 119 to the illuminated area side each non-reflective surface 114B ₁ is pressed against the protrusion 113, respectively. Thus, the elliptical reflector 114 is reliably positioned and held with respect to the light source lamp housing 112. Therefore, occurrence of optical axis deviation in the focus P ₂ of the outer one of the two focal P _1, P ₂ located in the ellipsoidal reflector and out is suppressed, enhancing the optical axis direction of the positional accuracy of the ellipsoidal reflector 114 Can be
[0036]
With the configuration described above, in the light source device 110 according to the second embodiment and the projector 1 including the same, when the elliptical reflector 114 is positioned with respect to the light source lamp housing 112, the inner surface (non- The reflecting surface 114B ₁ ) is brought into surface contact with the elliptical surface 113A ₁ of the positioning projection 113 in the light source lamp housing 112 and pressed. Accordingly, since the occurrence of the optical axis deviation in the focus P ₂ outside of the ellipsoidal two focus P ₁ located inside and outside of the reflector _114, P ₂ is an ellipsoidal mirror can be reliably suppressed, ellipsoidal The positional accuracy of the reflector 114 in the direction of the optical axis is greatly improved.
Therefore, also in the second embodiment, similarly to the first embodiment, it is possible to suppress a decrease in the illuminance of the illuminated area and a deterioration in the uniformity of the illuminance, and to obtain high display image quality.
[0037]
FIG. 12 is an explanatory diagram illustrating a first modification of the light source device. FIG. 12A is a front view, and FIG. 12B is a cross-sectional view. FIG. 13 is an explanatory diagram illustrating a second modification of the light source device. FIG. 13A is a front view, and FIG. 13B is a cross-sectional view. FIG. 14 is an explanatory diagram illustrating a third modification of the light source device. FIG. 14A is a front view, and FIG. 14B is a cross-sectional view.
In each of the above-described embodiments, the case where the positioning protrusion 113 is in surface contact with and abutting on the inner surface of the elliptical reflector 114 has been described. However, the present invention is not limited to this. 12 and 13, the protrusion 113b may be in point contact and abut. Further, as shown in FIG. 14, two positioning projections 113b may be brought into contact with the inner surface of the elliptical reflector 114 to position and hold the elliptical reflector 114 with respect to the light source lamp housing 112.
[0038]
Further, in each embodiment, a case has been described where the invention is applied to the light source device 110 including the reflector 114 formed of an ellipsoidal mirror. However, the present invention is not limited to this, and a parabolic mirror or a spherical mirror is provided as the reflector. The light source device can be applied similarly to each embodiment.
[Brief description of the drawings]
FIG. 1 is a plan view showing an optical system of a projector according to a first embodiment of the invention.
FIG. 2 is a sectional view showing the light source device according to the first embodiment of the present invention.
FIG. 3 is an explanatory diagram of a main part of the light source device according to the first embodiment of the present invention as viewed from the front.
FIG. 4 is an explanatory diagram of a main part of the light source device according to Embodiment 1 of the present invention as viewed from the rear.
FIG. 5 is an explanatory view showing a main part of the light source device according to the first embodiment of the present invention.
FIG. 6 is an explanatory diagram showing a light source lamp housing of the light source device according to the first embodiment of the present invention.
FIG. 7 is a sectional view showing a light source device according to a second embodiment of the present invention.
FIG. 8 is an explanatory diagram of a main part of a light source device according to Embodiment 2 of the present invention as viewed from the front.
FIG. 9 is an explanatory diagram of a main part of the light source device according to Embodiment 2 of the present invention as viewed from the rear.
FIG. 10 is an explanatory diagram showing a main part of a light source device according to Embodiment 2 of the present invention.
FIG. 11 is an explanatory view showing a light source lamp housing of the light source device according to Embodiment 2 of the present invention.
FIG. 12 is an explanatory view showing Modification Example 1 of the light source device.
FIG. 13 is an explanatory view showing Modification Example 2 of the light source device.
FIG. 14 is an explanatory diagram showing a third modification of the light source device.
[Explanation of symbols]
Reference Signs List 1 projector, 100 illumination optical system, 110 light source device, 112 light source lamp housing, 112A mounting base, 112A ₁ spring locking hole, 112B mounting frame, 112B ₁ spring locking projection, 112b front plate, 112b ₁ circular window , 113 Projecting portion for positioning, 113A flat surface, 114 elliptical reflector, 114A reflective surface, 114B non-reflective surface, 116 arc tube, 116A glass tube, 118 parallelizing lens, 119 spring, 119A locking hole, 119B engaging Unit, 120 first lens array, 130 second lens array, 140 polarization conversion element, 150 superimposing lens, 400RR liquid crystal display device, 400GG liquid crystal display device, 400BB liquid crystal display device, 500 cross dichroic prism, _{P 1} inside the focus, _{P 2} outer focus, OC ellipsoid riff Kuta optical axis

Claims (7)

An elliptical reflector that is positioned and held in the light source lamp housing and opens to the illuminated area side;
A light-emitting device provided in the ellipsoidal reflector and having an arc tube for emitting illumination light,
The light source lamp housing has a positioning convex portion that contacts the inner surface of the elliptical reflector,
The light source device, wherein the elliptical reflector is urged toward the illuminated area by pressing against the convex portion. 2. The light source device according to claim 1, wherein the convex portion is a convex portion that abuts on a non-reflective surface formed of a curved surface that is continuous with a reflective surface of the elliptical reflector. 3. 2. The light source device according to claim 1, wherein the convex portion is a convex portion that abuts on a non-reflective surface formed of a flat surface that is discontinuous with a reflective surface of the elliptical reflector. 3. The light source device according to any one of claims 1 to 3, wherein the convex portion is a convex portion that comes into contact with an inner surface of the elliptical reflector by surface contact. The light source device according to any one of claims 1 to 3, wherein the convex portion is a convex portion that comes into contact with the inner surface of the elliptical reflector by point contact. The light source device according to any one of claims 1 to 5, wherein the convex portion includes two or four convex portions. An illumination optical system for emitting illumination light,
A color separation optical system that separates the illumination light emitted from the illumination optical system into a plurality of color lights,
A plurality of electro-optic modulators that form images by modulating each color light separated by the color separation optical system,
A color combining optical system that combines modulated light emitted from the plurality of electro-optical modulators,
A projector having a projection optical system for projecting and displaying an image synthesized by the color synthesis optical system on a projection surface;
A projector, wherein the illumination optical system is an illumination optical system having the light source device according to any one of claims 1 to 6.

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