JP2006078949A - Light source device for projection type display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device for a projection type display apparatus using two lamps as light sources, the light source device being capable of stably maintaining high luminance through a simple configuration by combining the lamps with a rod having tapering faces. <P>SOLUTION: The optical axes 5 and 15 of the lamps 1 and 11 are disposed so as to be parallel to each other, so as not to coincide with each other, and so as to be parallel to the incident face 7 of the rod 6. Synthesizing mirrors 4 and 14 are disposed such that they intersect at a right angle and their intersecting line coincides with a plane extended from a symmetrical plane including a line passing through the centers of the incident face 7 and emitting face 8 of the rod 6. The lamps 1 and 11 and synthesizing mirrors 4 and 14 are disposed so as to be rotationally symmetrical to a center line passing through the center of the incident face and emitting face of the rod 6. Thus, the light source that has a simple configuration and is stable can be obtained for the projection type display device. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light source device for a projection display device using two lamps as light sources.

  In recent years, projectors that magnify and project video signals such as personal computers and videos have been commercialized in higher brightness types so that they can be used even in bright rooms. One type of projector that uses multiple lamps as a light source is a product. It has become.

  A light source device for a projection display device used in a conventional projector will be described below.

Conventionally, as a light source device of a projection display device using a two-lamp combination used in a projector, one described in Japanese Patent Laid-Open No. 2001-359025 is known. The light source device of the projection display device is shown in FIG. FIG. 5 is a plan view of a light source device used in a conventional projector. In FIG. 5, an illumination optical system (not shown) is disposed above the light source device, and mainly includes light source lamps 111 and 112, reflectors 121 and 122, and a two-lamp combining prism 141. Lights L1 and L2 emitted from the light source lamps 111 and 112, respectively, are guided to the illumination optical system along the optical axis X via the reflectors 121 and 122, which are ellipsoidal mirrors, and the two-lamp combining prism 141. The light source lamps 111 and 112 are arranged such that the light emitting portions (arcs) are positioned at the first focal points of the reflectors 121 and 122, respectively, and the reflectors 121 and 122 have the same long axis and the second focal points are close to each other. So as to face each other. Let this long axis be Y. Lights L1 and L2 emitted from the light source lamps 111 and 112 at the first focal point are reflected by the reflecting surfaces 121a and 122a of the reflectors 121 and 122, respectively, and are collected corresponding to the second focal points of the reflectors 121 and 122, respectively, due to the characteristics of the elliptical surfaces. Focus on light spots S1 and S2. However, since the light emitting portions of the light source lamps 111 and 112 have a certain size, the light from the reflectors 121 and 122 does not become a point exactly at the condensing position, and the cross section of the light flux at the condensing position has a small diameter. It becomes a circle. The two-lamp combining prism 141 is a triangular prism whose section is a right-angled isosceles triangle, and the orthogonal surfaces 141a and 141b are used as reflecting surfaces. The condensing points S1 and S2 of the reflectors 121 and 122 are the reflecting surfaces 141a and 141a, respectively. It is located on or very close to 141 b and is arranged so that the hypotenuse of the cross section is parallel to the major axis Y of the reflectors 121 and 122. The light from the light source lamps 111 and 112 reflected and converged by the reflectors 121 and 122 is reflected by the reflecting surfaces 141a and 141b, respectively, and becomes a conical divergent light beam traveling in the same direction. At this time, the optical axis of the divergent light beam (the central axis of the light beam) is the distance between the long axis Y of the reflectors 121 and 122 and the reflecting surfaces 141a and 141b due to the positional relationship between the reflectors 121 and 122 and the two-lamp combining prism 141. 2d1 apart and parallel. In the illumination optical system, the optical axis X is located at the center of the optical axes of the two divergent light beams from the two-lamp combining prism 141. The optical axis X and the long axis Y are orthogonal to each other. The light reflected by the two-lamp combining prism 41 passes through a collimator lens, two integrators, and a plurality of optical elements thereafter, illuminates the light valve, and the image of the light valve is enlarged and projected by the projection lens.
JP 2001-359025 A

  However, in the above conventional configuration, since the lamp as the light source folds in the vicinity of the condensing point (focal point), the prism and its reflecting surface become very hot, and since it folds at the position where the light is condensed in a small area, high accuracy is obtained. Therefore, there are problems that the cost is increased due to the use of expensive parts, the precision of related parts is improved, and adjustment is required during assembly. In addition, when the accuracy of the related parts cannot be ensured, there is a problem that the luminance is reduced and the luminance is varied.

  The present invention has a planar light valve that can be modulated for each pixel in response to an external signal, an incident aperture surface perpendicular to the optical axis, and an output aperture surface, and has four surfaces extending from the incident aperture surface to the output aperture surface. A projection display device comprising a rod having a reflecting surface, comprising an ellipsoidal mirror and capable of condensing a light beam at a predetermined position, and folding the light beam from the first light source A first reflecting mirror that is guided so as to be incident on the incident aperture surface of the rod at a predetermined angle and that the incident aperture surface of the rod coincides with the condensing position of the first light source; and a second light source And a second reflecting mirror disposed so that the incident aperture surface of the rod coincides with the condensing position of the second light source. , First and second light sources and first and second reflectors Each of the light source devices of the projection type display device is arranged rotationally symmetrically with respect to a target axis connecting the center of the entrance aperture surface and the center of the exit aperture surface of the rod. The optical axes of the second light source are parallel to each other and do not coincide with each other, are parallel to the incident aperture surface of the rod, the angle of intersection of the reflecting surfaces of the first and second reflectors is a right angle, and the line of intersection is the rod Is parallel to the incident aperture surface of the rod and coincides with an extended surface of at least one symmetry plane including the target axis connecting the center of the incident aperture surface of the rod and the center of the exit aperture surface, and the incident aperture surface and the exit aperture surface of the rod Are rectangular shapes, and one set of opposing surfaces among the four surfaces extending from the entrance aperture surface to the exit aperture surface is symmetrically and tapered from the entrance side to the exit side, and the other opposing surfaces are parallel surfaces. The first and second reflecting mirrors Intersection line is obtained by a light source device of a projection display device, characterized in that parallel to the parallel surfaces, an effect that can be incident light from the light source to the glass rod at a high efficiency.

  As described above, the present invention is composed of only a plane mirror, can achieve two-lamp synthesis without using expensive parts such as prisms, and folds the light beam at a position away from the light collection position of the light source. The temperature of the optical component can be kept low, the related components do not require high accuracy, and there is an excellent effect that adjustment during assembly is unnecessary.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
1A and 1B are views showing an arrangement of optical element parts constituting the present invention, wherein FIG. 1A is a plan view and FIG. 1B is a front view. 2 shows an A arrow view seen from arrow A in FIG. 1, FIG. 3 (a) shows a BB cross-sectional view of FIG. 1, and (b) shows a CC cross-sectional view. FIG. 4 is a perspective view showing the entire configuration of the projection display apparatus using the light source device of the projection display apparatus of the present invention.

  A lamp 1 as a light source includes a tube 2 and an ellipsoidal mirror 3 having a light emitting point as a focal point. The light emitted from the light source 1 is reflected and folded by the combining mirror 4 and enters the incident surface 7 of the rod 6. At this time, the positional relationship between the light source 1 and the incident surface of the rod 6 is the other focal point of the elliptical mirror 3. Match.

  Similarly, the light source 11 is composed of a tube 12 and an ellipsoidal mirror 13, and the emitted light is reflected and folded by the combining mirror 14 and enters the incident surface 7 of the rod 6, and the positional relationship thereof is the incident surface 7 of the rod 6. , They are positioned 180 degrees symmetrical with respect to the center line connecting the centers of the exit surfaces 8. Furthermore, the optical axis 5 of the light source 1 and the optical axis 15 of the light source 11 are parallel to each other and not coincident with each other as shown in FIG.

  Further, the composite mirrors 4 and 14 are arranged so that the intersecting angle θ is at a right angle, and the intersecting line coincides with the extended surface of the symmetry plane of the rod 6 including the center line connecting the center of the entrance surface 7 and the exit surface 8 of the rod 6. Has been. Further, the rod 6 is composed of tapered surfaces 9 and 10 gradually expanding from the incident side to the output side shown in FIG. 3 and parallel surfaces 21 and 22 parallel to each other.

  The operation of the light source device of the projection display device configured as described above will be described.

  In the light source device configured in this way, the light from the lamps 1 and 2 is incident at the condensing angle of the ellipsoidal mirrors 3 and 13 on the side reflected by the parallel surfaces 21 and 22 of the rod 6, and Reflected a predetermined number of times and exits from the exit surface 8 at a spread angle α similar to the condensing angle of the ellipsoidal mirror, and the collection of the ellipsoidal mirrors 3 and 13 on the side reflected by the tapered surfaces 9 and 10 of the rod 6. Light is incident at an angle obtained by adding an opening angle β of the optical axis after being reflected by the composite mirrors 4 and 14 of the lamps 1 and 11 to the light angle, reflected by the tapered surfaces 9 and 10 a predetermined number of times, The light is emitted from the light exit surface 8 at the same spread angle as that of FIG.

  Further, the configuration and operation of a projection display device using this light source device will be described with reference to FIG. The light emitted from the light source device having the above-described configuration is a color wheel 23 having a rotating disk-shaped filter, a relay lens group 24 composed of a plurality of lenses, folding mirrors 25 and 26, and a field lens 27. Then, the light passes through the TIR prism 28 and enters the mirror array element 29 which is a light valve. The mirror array element 29 enlarges and projects the light spatially modulated according to the video signal by the projection lens 30.

  As described above, according to the present embodiment, it is possible to use light of a lamp, which is a light source, with high efficiency in a projection display device using a glass rod having a tapered surface. Further, by folding the light beam away from the condensing point of the light source, it is possible to suppress the temperature rise of the related optical components. Furthermore, when the projection lens is installed upward or downward, the optical axis of the lamp can be installed almost horizontally, and the characteristics and life of the lamp are hardly deteriorated.

  In the above description, the rod 6 is assumed to be a solid glass type, but the same effect can be obtained by using a mirror rod or a mirror tunnel type rod in which four mirrors are combined. In addition, as a projection display device, a color wheel is used for time-division color separation and one light valve is used. However, a color separation optical system and three light valves are used without using a color wheel. It goes without saying that can also be used.

  The light source device of the projection display device of the present invention can be applied to uses such as projectors and other illumination optical systems that have a simple configuration and stably require high luminance.

1A and 1B are diagrams showing a light source device of a projection display device according to the present invention, wherein FIG. A view as seen from arrow A in FIG. The shape of a rod is shown, (a) is BB sectional drawing of FIG.1 (b), (b) is CC sectional drawing of FIG.1 (b). The perspective view which shows the structure of the whole projection display apparatus using the light source device of this invention. Plan view of a light source device of a conventional projection display device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Lamp 2,12 Tube 3,13 Ellipsoidal mirror 4,14 Synthetic mirror 5,15 Lamp optical axis 6 Rod 7 Incident surface 8 Output surface 9, 10, Tapered surface 21, 22 Parallel surface 23 Color wheel 24 Relay lens Group 25, 26 Folding mirror 27 Field lens 28 TIR prism 29 Mirror array element 30 Projection lens

Claims (4)

A flat light valve that can be modulated for each pixel in response to a signal from the outside, and a rod that has incident and exit aperture surfaces perpendicular to the optical axis and four reflecting surfaces extending from the entrance aperture surface to the exit aperture surface A projection display device comprising:
A first light source and a second light source, each of which has an ellipsoidal mirror and can collect a light beam at a predetermined position;
The first light source is arranged so that the light beam from the first light source is turned back and incident on the incident aperture surface of the rod at a predetermined angle, and the incident aperture surface of the rod is aligned with the condensing position of the first light source. A reflector,
The second light source is arranged so that the light beam from the second light source is turned back and incident on the incident aperture surface of the rod at a predetermined angle, and the incident aperture surface of the rod is aligned with the condensing position of the second light source. A reflector,
With
A projection characterized in that the first and second light sources and the first and second reflecting mirrors are arranged rotationally symmetrically with respect to a target axis connecting the center of the entrance aperture surface and the center of the exit aperture surface of the rod, respectively. Type light source device. 2. The light source device of a projection display device according to claim 1, wherein the optical axes of the first and second light sources are parallel to each other and do not coincide with each other, and are parallel to an incident opening surface of the rod. The angle of intersection of the reflecting surfaces of the first and second reflecting mirrors is a right angle and the intersecting line is parallel to the incident aperture surface of the rod, and the target axis connects the center of the incident aperture surface of the glass rod and the center of the exit aperture surface. 3. The light source device for a projection display device according to claim 1, wherein the light source device coincides with an extended surface of at least one plane of symmetry including The rod has an entrance aperture surface and an exit aperture surface each having a rectangular shape, and a pair of opposing surfaces among the four surfaces extending from the entrance aperture surface to the exit aperture surface are symmetrical and tapered from the entrance side to the exit side. 4. A light source device for a projection display device according to claim 1, wherein the other facing surface is a parallel surface, and an intersection line of the first and second reflecting mirrors is parallel to the parallel surface. .

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