TWI421539B - Light source device and projection type display device - Google Patents

Description

Light source device and projection type display device

The present invention relates to a light source device and a projection type display device using a plurality of light source lamps.

In order to realize a large screen and a high brightness of an image displayed by a projection type display device, a projection type display device having a multi-lamp type light source device including a plurality of light source lamps has been proposed. For example, the light source device for a projection type display device proposed in Patent Document 1 (paragraphs [0013] to [0018] and 1 of the Japanese Patent Laid-Open Publication No. 2001-359025) utilizes a light collecting point disposed in a light source lamp. The nearby prism combines the beams from the two light sources that are arranged opposite each other. Further, the configuration proposed in Patent Document 2 (paragraphs [0099] to [0108], 9th, 10A, and 10B of JP-A-2005-115094) is arranged in different directions by inclination. The two mirrors are used to introduce the light beams from the two light source lamps into the incident end face of the cylindrical optical integrator (Rod Integrator).

[Previous Technical Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2001-359025

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2005-115094

However, in the device described in Patent Document 1, since the two light source lamps are arranged to face each other with the cymbal therebetween, the loss of the light source lamp (loss) the ratio of light reaching the light-emitting portion of the light source lamp in the light is increased, the problem of the light use efficiency is lowered, and the life of the light source lamp is shortened due to the temperature rise of the light source lamp caused by the loss of the incident light. The problem.

Further, in the device described in Patent Document 2, since each of the synthetic mirrors is disposed at a position shifted in a direction orthogonal to the optical axis of the cylindrical optical integrator, each of the light source lamps is emitted and reflected in each of the composite lights. The incident angle of each beam incident on the cylindrical optical integrator by the mirror reflection becomes large (the result is that the two beams incident on the two types of the synthetic optical mirror and incident on the cylindrical optical integrator are regarded as one beam) The light angle becomes larger). In order to reduce (correct) the adverse effect caused by the light incident on the cylindrical optical integrator having a large condensing angle (incomplete light intensity uniformity), the cylindrical optical integrator is provided with a taper. Shape part. However, in such a configuration, there is a variation in the number of reflections of the light in the cylindrical optical integrator, and the uniformity of the light intensity on the exit surface of the cylindrical optical integrator (resulting in uniformity of illumination on the screen) is deteriorated. problem. Further, when such correction is insufficient, there is a problem that light utilization efficiency is lowered due to the presence of light which is not used for the angle component of the screen illumination.

Therefore, the present invention has been made in order to solve the problems of the above-described conventional techniques, and an object of the present invention is to provide a projection type display device which has high light use efficiency and high uniformity of illumination on a screen, and can realize a long life of a light source device.

The present invention provides a light source device characterized by comprising: a light intensity equalizing portion having an incident end and an emitting end, and light incident on the incident end The beam is converted into a light beam whose intensity distribution is uniformized and emitted from the emission end; the first light source unit emits the first light beam; at least one curved reflection portion, and the first light beam emitted from the first light source unit is introduced into the The incident end of the light intensity equalizing portion; and the second light source portion emit a second light beam toward the incident end of the light intensity equalizing portion; and the first light source portion reaches the light through the curved reflecting portion The optical axis of the first light beam at the incident end of the intensity equalizing portion does not have a portion that matches the optical axis of the second light beam that reaches the incident end of the light intensity equalizing portion from the second light source portion, and An optical axis of the first light beam immediately before entering the incident end of the light intensity equalizing portion and an optical axis of the second light beam reaching the incident end of the light intensity equalizing portion from the second light source means The first light source unit, the second light source unit, and the curved reflection unit are disposed so as to be substantially parallel to each other.

According to the present invention, the light utilization efficiency can be improved, and the uniformity of illumination on the screen can also be improved.

(Embodiment 1)

Fig. 1 is a view schematically showing the configuration of a projection display apparatus according to a first embodiment of the present invention. As shown in Fig. 1, the projection display apparatus according to the first embodiment includes a light source device 10 and a light beam whose intensity is uniformized, and an image display element (light valve) 61 which is self-independent according to the input image signal. The light beam L3 emitted from the light source device 10 is modulated into image light L4, and the projection optical system 62 enlarges and projects the image light L4 onto the screen 63. although The reflective image display element 61 is shown in Fig. 1, but the image display element 61 may also be a transmissive image display element. The image display element 61 is, for example, a liquid crystal light valve, a digital micromirror device (DMD), or the like. When it is a rear projection type projection type display device, the screen 63 belongs to a part of the projection type display device. Further, the arrangement of the light source device 10, the image display element 61, the projection optical system 62, and the screen 63 is not limited to the illustrated example.

The light source device 10 includes a first light source lamp 11 that is a first light source means belonging to the first light source unit, and emits a first light beam L1, and a second light source lamp 12 that is a second light source means belonging to the second light source unit. The second light beam L2 is emitted so as to be parallel to the first light source lamp 11, and the light intensity equalizing element 15 as a light intensity equalizing means belonging to the light intensity equalizing portion converts the light beam incident on the incident end 15a. The light beam whose intensity distribution is uniformized is emitted from the emitting end 15b, and the relay optical system 13 guides the first light beam L1 emitted from the first light source lamp 11 to the incident end 15a.

In the first embodiment, the first light beam L1 emitted from the first light source lamp 11 and the second light beam L2 emitted from the second light source lamp 12 are each a concentrated light beam. More specifically, the center component of the first light beam emitted from the light-emitting center of the first light source lamp 11 in the first light beam L1 and the second light beam emitted from the light-emitting center of the second light source lamp 12 in the second light beam L2 The central component is the concentrated beam. Since the light-emitting system of the first light source lamp 11 or the second light source lamp 12 has a limited size, the light beam is emitted from a position other than the center of the light emission, and the light beam emitted from a position other than the center of the light emission is strictly not The condensed spot that is concentrated by the center component of the first light beam and the center component of the second light beam. Further, the light beam emitted from a position other than the light-emitting center is also widely collected around the light-converging point of the center component of the first light beam and the center component of the second light beam. The optical axes 11c1, 11c2, and 11c3 of the first light flux L1 from the first light source lamp 11 to the incident end 15a of the light intensity equalizing element 15 via the relay optical system 13 (that is, the center light of the first light beam L1) The optical axis 12c of the second light flux L2 that reaches the incident end 15a of the light intensity equalizing element 15 from the second light source lamp 12 does not have a portion that matches the central light ray of the second light beam L2, and The first light source lamp 11, the second light source lamp 12, and the relay optical are determined such that the optical axis 11c3 of the first light beam L1 immediately before the incident end 15a and the optical axis 12c of the second light beam L2 are substantially parallel. The respective configurations of the system 13 and the arrangement of the first light source lamp 11, the second light source lamp 12, and the relay optical system 13 with respect to the light intensity equalizing element 15.

The phrase "disposed in a substantially parallel manner" means the optical axis 11c3 of the first light source lamp 11 (that is, the central light beam of the first light beam emitted from the first light source lamp 11 at the incident end 15a of the light intensity equalizing element 15). And the optical axis 12c of the second light source lamp 12 (that is, the center ray of the second light beam emitted from the second light source lamp 12 in the incident end 15a of the light intensity equalizing element 15) is parallel or can be regarded as parallel In this manner, the first light source lamp 11, the second light source lamp 12, and the relay optical system 13 are disposed. In the first drawing, the first optical axis 11c3 of the first light source lamp 11 is parallel to the optical axis 15c of the light intensity equalizing element 15, and the second optical axis 12c of the second light source lamp 12 and the light intensity are shown. The optical axis 15c of the homogenizing element 15 is also arranged in parallel. 1 Case of the light source lamp 11, the second light source lamp 12, the relay optical system 13, and the light intensity equalizing element 15. Further, the relay optical system 13 includes a first curved mirror 13a, a second curved mirror 13d, and two lens elements 13b and 13c belonging to a curved reflecting portion that bends and reflects the light path of the first light beam L1.

Further, instead of the arrangement of the relay optical system, the first light source lamp 11 and the second light source 11c1 may be arranged such that the optical axis 11c1 of the first light source lamp 11 and the optical axis 12c of the second light source lamp 12 are at right angles. The light source lamp 12 guides the first light beam L1 to the incident end 15a of the light intensity equalizing element 15 by a curved mirror. The curved mirror in this case or the curved mirror closest to the incident end 15a of the light intensity equalizing element 15 as in the above-described second curved mirror 13d is used as the final curved reflecting portion.

The first light source lamp 11 can be configured, for example, by an illuminator 11a that emits white light and an ellipsoidal mirror 11b that is provided around the illuminator 11a. The elliptical mirror 11b reflects the light beam emitted from the first focus corresponding to the first center of the ellipse and converges the reflected light beam at the second focus corresponding to the second center of the ellipse. The illuminant 11a is disposed in the vicinity of the first focus of the ellipsoidal mirror 11b, and the light beam emitted from the illuminator 11a is concentrated near the second focus of the ellipsoidal mirror 11b. Further, the second light source lamp 12 can be configured, for example, by an illuminator 12a that emits white light and an ellipsoidal mirror 12b that is provided around the illuminator 12a. The elliptical mirror 12b reflects the light beam emitted from the first focus corresponding to the first center of the ellipse and converges the reflected light beam at the second focus corresponding to the second center of the ellipse. The illuminant 12a is disposed near the first focus of the ellipsoidal mirror 12b, and the beam emitted from the illuminant 12a converges on the ellipsoid Near the second focus of the circular mirror 12b. Alternatively, a parabolic mirror may be used instead of the elliptical mirrors 11b and 12b. In this case, the light beams emitted from the luminous bodies 11a and 12a by the parabolic mirror are substantially parallelized, and then they may be concentrated by a condenser lens (not shown). Further, a concave mirror other than the parabolic mirror may be used instead of the elliptical mirrors 11b and 12b. In addition, the number of light source lamps can also be set to three or more.

The first light beam L1 in Fig. 1 is a conceptual view showing that the light beam emitted from the light-emitting body 11a is concentrated in the vicinity of the first light-converging point F1 of the elliptical mirror 11b. Similarly, the second light beam L2 conceptually shows that the light beam emitted from the light-emitting body 12a is concentrated near the light-converging point F3 of the ellipsoidal mirror 12b. In addition, in an actual light source lamp, the illuminating system has a finite-size and non-ideal point source, so generally there is not only the beam component condensed at the condensing point shown by a straight line (dashed line) in FIG. It also contains a plurality of light beams that are not concentrated on the condensed spot (components distributed outside the beam component condensed at the condensed spot). The light beams that are not concentrated on the condensing point are shown in Figs. 14 and 15 which will be described later.

Further, in the projection display apparatus of the first embodiment, the first light source is disposed such that the first light collecting point F1 of the first light beam L1 is located closer to the light intensity equalizing element 15 than the first curved mirror 13a. The lamp 11 and the first curved mirror 13a. Further, the first light beam L1 condensed at the first condensing point F1 is positioned such that the second condensed spot F2 (final condensing point) is positioned by the lens 13b, the lens 13c, and the second curved mirror 13d. The lens element 13b, the lens element 13c, the second curved mirror 13d, and the light intensity equalizing element are arranged in such a manner that the light intensity equalizing element 15 is in the vicinity of the incident end 15a. 15. The second light beam L2 condensed by the ellipsoidal mirror 12b is directly condensed by the condensing point F3 in the vicinity of the incident end 15a of the light intensity equalizing element 15 without particularly passing through the optical element. Further, in the projection type display device of the first embodiment, the center ray of the first light beam L1 (that is, the optical axis 11c3) (the light of the element 15 parallel to the optical axis 12c and parallel to the light intensity equalizing element 15 in the first embodiment) The shaft 15c) is incident on the first incident position of the incident end 15a and the central ray of the second light beam L2 (that is, the optical axis 12c) (in the first embodiment, parallel to the optical axis 15c of the light intensity equalizing element 15). The second incident position of the incident end 15a is a position different from each other, and is a position deviated from the optical axis 15c of the light intensity equalizing element 15 (a position deviating from the eccentric amount d1, d2 to be described later). In addition, in the first drawing, the first light collecting point F1 is disposed closer to the light intensity equalizing element 15 than the first curved reflecting mirror 13a, but the present invention is not limited thereto.

The second curved mirror 13d belonging to the final curved reflecting portion is preferably disposed at a position that does not block the center ray (consistent with the optical axis 12c) of the second light beam L2 from the second light source lamp 12 toward the incident end 15a. It is more preferable to arrange it so as not to block the position of the center component of all the second light beams. The center component of the light beam refers to a light beam component that emits light from the center of the light source and concentrates at the light collecting point.

The position of the end portion of the second light source lamp 12 on the optical axis 12c side of the second curved mirror 13d (the side surface connecting the light reflecting surface and the back surface thereof) 13e in the direction perpendicular to the optical axis 15c is usually the optical axis 15c. Or nearby. However, for example, when the luminous intensity of the first light source lamp 11 is set to be larger than the luminous intensity of the second light source lamp 12, it is preferable to improve the light use efficiency of the entire device. The end portion 13e is formed closer to the optical axis 12c (the center light ray of the second light beam L2) of the second light source lamp 12 than the optical axis 15c. On the other hand, when the light-emission intensity of the second light source lamp 12 is made larger than the light-emission intensity of the first light source lamp 11, for example, in order to improve the light use efficiency of the entire device, it is preferable to make the end portion 13e closer to the optical axis 15c. The center light ray (optical axis 11c3) side of the first light source lamp 11.

The extent to which the second curved mirror 13d blocks the second light beam L2 depends not only on its position but also on its size. In order to make the degree of blocking the second light beam L2 small, the second curved mirror 13d is preferably small. On the other hand, in order to make the number of the first light beams L1 toward the incident end 15a large, the second curved mirror 13d is preferably larger. The second curved mirror 13d is preferably a reflecting surface having a size that can reflect the entire center component of the first light beam.

Therefore, in the first embodiment, as shown in Fig. 1, the second curved mirror 13d that can reflect the entire center component of the first light beam is disposed in the first light beam L1 and the second light beam L2. The position is not to block the position of the center component of all the second light beams. Further, the second curved mirror 13d may not reflect a part of the central component of the first light beam or block a part of the central component of the second light beam.

The light intensity equalizing element 15 has a first light beam L1 and a second light beam L2 incident from the incident end 15a in the plane of the light beam (that is, in a plane orthogonal to the optical axis 15c of the light intensity equalizing element 15). The function of homogenizing the light intensity (that is, reducing the illuminance unevenness). The light intensity equalizing element 15 is, for example, a polygonal columnar rod which is made of a transparent material such as glass or resin and which is formed as a total reflection surface on the inner side of the side wall (also In other words, a columnar member having a polygonal cross-sectional shape or a pipe (tubular member) having a tubular shape and a polygonal cross-sectional shape so as to have a light-reflecting surface as an inner side. When the light intensity equalizing element 15 is a polygonal columnar rod, the light intensity equalizing element 15 reflects the light incident from the incident end by a total reflection of the transparent material and the air interface, and then emits it from the emitting end. When the light intensity equalizing element 15 is a polygonal tube, the light intensity equalizing element 15 reflects the light incident from the incident end a plurality of times by the reflection action of the mirror facing the inner side, and then emits it from the emitting end (the ejection opening). As long as the light intensity equalizing element 15 ensures an appropriate length in the traveling direction of the light beam, light that has been internally reflected plural times is superimposed and irradiated in the vicinity of the emitting end 15b of the light intensity equalizing element 15, thereby uniformizing the light intensity. A substantially uniform intensity distribution is obtained in the vicinity of the emitting end 15b of the element 15.

Fig. 2(a) and Fig. 2(b) are explanatory diagrams schematically showing the distribution of the light beam at the incident end 15a of the light intensity equalizing element 15. In Fig. 2 (a) and (b), the range in which the concentration is thick (close to black) is the area where the beam is strong (bright), and the lighter the density (closer to white) is the weaker (dark) area of the beam. . Fig. 2(a) shows an example of a beam distribution at the incident end of the light intensity equalizing element in the case of a comparative example using one light source lamp. Fig. 2(a) shows a distribution in which the peak of the light intensity is present near the center of the incident end 15a and gradually darkens toward the periphery. Further, Fig. 2(b) shows an example of the beam distribution of the incident end 15a of the light intensity equalizing element 15 in the case of the present invention using two light source lamps. Further, Fig. 2(b) is shown at the incident end 15a of the light intensity equalizing element 15, and a portion of the light irradiation region of the first light source lamp 11 and the light irradiation region irradiated by the second light source lamp 12 is at the incident end. 15a overlap example.

Here, the reason why the light beam in the incident end 15a has the distribution shown in Fig. 2(a) when using one light source lamp will be described. When the illuminant in the light source lamp is an ideal point source, the beam emitted from the illuminator is ideally concentrated at the condensing point of the ellipsoid mirror. However, the illuminating system is affected by a limited size (generally, the diameter in the optical axis direction is about 0.8 mm to 1.5 mm), the arrangement accuracy of the illuminating body, or the shape accuracy of the ellipsoidal mirror, etc., actually concentrating The beam will have a distribution as shown in Fig. 2(a). Further, since the condensed light beam has the distribution as shown in Fig. 2(a), not all the light beams are taken in the incident end 15a of the light intensity equalizing element 15, and a part of the light beam is deviated from the incident end 15a without Used for image projection.

Fig. 3 is a layout view schematically showing a curved mirror of a comparative example. Fig. 3 shows a configuration in which one light source lamp (not shown) is disposed, and the center ray (optical axis 111c) of the light beam incident from the light source lamp to the curved mirror 113 is orthogonal to the optical axis 115c of the light intensity equalizing element 115. Further, the central light ray of the light beam L1 reflected by the curved mirror 113 is configured to coincide with the optical axis 115c of the light intensity equalizing element. In the case of the comparative example of Fig. 3, since the size of the reflecting surface of the curved mirror 113 can be made sufficiently large, the light beam L1 from the light source lamp can be bent and reflected so as to reduce the loss.

Fig. 4 is a view showing the configuration of a key part of the projection display apparatus of the first embodiment. The second curved mirror 13d and the light intensity equalizing element 15 are shown in Fig. 4. In the first embodiment, each configuration is arranged such that the first light beam L1 from the relay optical system 13 (shown in Fig. 1) is concentrated. The second focus (convergence point F3) of the ellipsoidal mirror 12b of the point F2 and the second light source lamp 12 (shown in Fig. 1) is located in the vicinity of the incident end 15a of the light intensity equalizing element 15. Further, the configuration is such that the optical axis of the first light beam L1 from the first light source lamp 11 is closer to the first optical axis 11c3 on the side of the light intensity equalizing element 15 than the curved mirror 13d, and the second light source lamp 12 is provided. The second optical axes 12c of the second light beams are arranged substantially in parallel and do not have a uniform portion.

The first light beam L1 from the first light source lamp 11 is incident on the incident end 15a of the light intensity equalizing element 15 and the second light beam L2 from the second light source lamp 12 is incident on the light intensity by the relay optical system 13. In the case where the incident end 15a of the element 15 is homogenized, the second curved mirror 13d cannot be sufficiently secured in order to prevent the second light beam L2 from the second light source lamp 12 from being blocked as much as possible. Therefore, in the configuration of Fig. 4, the first light beam L1 and the second light beam L2 are inevitably subjected to a certain degree of loss.

The central ray L10 (optical axis 13c1) of the first light beam L1 and the central ray L20 (optical axis 12c) of the second light beam L2 and the optical axis 15c of the light intensity equalizing element 15 are bent and reflected by the second curved mirror 13d. Consistent, the loss of light will be more. Therefore, in the projection display apparatus according to the first embodiment, the eccentric amount d1 of the center light L10 of the first light beam L1 that is curved and reflected by the first curved mirror 13a with respect to the optical axis 15c of the light intensity equalizing element 15 is The eccentric amount d2 of the center light ray L20 of the second light beam L2 with respect to the optical axis 15c of the light intensity equalizing element 15 is set to a value larger than zero.

Fig. 5 is an explanatory diagram showing a configuration in which the relationship between the calculated eccentricities d1 and d2 and the light use efficiency is displayed. As shown in Fig. 5, for example, the center ray L10 of the first light beam from the first light source lamp 11 is incident on the eccentric amount. At the position of d1, since the first light beam L1 from the first light source lamp 11 converges on the incident end 15a of the light intensity equalizing element 15 to deviate to the position of the eccentric amount d1, the incident end of the light intensity equalizing element 15 The light utilization efficiency of 15a is lowered. Similarly, as shown in FIG. 5, for example, when the center light L20 of the second light beam from the second light source lamp 12 is incident on the position of the eccentric amount d2, the second light beam from the second light source lamp 12 is formed. The L2 concentrated light deviates from the incident end 15a of the light intensity equalizing element 15 by the position of the eccentric amount d2, so that the light use efficiency at the incident end 15a of the light intensity equalizing element 15 is lowered.

Fig. 13(a) shows the distribution of the first light beam L1 from the first light source lamp 11 and the center light ray of the first light beam L1 (the optical axis 11c3) showing the incident end 15a of the light intensity equalizing element 15 of the first embodiment. The map of the eccentric amount d1, and Fig. 13(b) shows the distribution of the second light beam L2 from the second light source lamp 12 and the center light of the second light beam L2 at the incident end 15a of the light intensity equalizing element 15. A graph of the eccentricity d2 of the shaft 12c). Further, Fig. 14 is a view showing a representative ray of the first light beam L1 having the distribution shown in Fig. 13(a) in the incident end 15a of the light intensity equalizing element 15 (light condensed on the condensing point F2) Example) A diagram of L1a and L1b. Further, Fig. 15 is a view showing a representative ray of the second light beam L2 having the distribution shown in Fig. 13(b) in the incident end 15a of the light intensity equalizing element 15 (not condensed at the condensing point F3) Example of light) L2a, L2b, L2c, L2d.

The eccentric amount d1 is the distance from the optical axis 15c of the light intensity equalizing element 15 to the optical axis 11c3 of the first light beam L1, and the eccentric amount d2 is the light of the optical axis 15c to the second light beam L2 of the light intensity equalizing element 15. The distance of the shaft 12c. As described above, the illuminants 11a and 12a are mainly caused by the size of the lamp, the positional errors of the illuminants 11a and 12a, the shape error and the position error of the ellipsoidal mirrors 11b and 12b, and the first light beam L1 is the 14th. As shown in the figure, a light beam component (for example, light rays L1a, L1b) that does not condense on the light-converging point F2 is included, and the second light beam L2 includes a light beam component that is not concentrated on the light-converging point F3 as shown in FIG. For example, light rays L2a, L2b, L2c, L2d). As a result, as shown in Figs. 2(a) and (b) and Figs. 13(a) and (b), the condensed light beam from the light source lamp has a light beam having a distribution (expansion) at the incident end 15a.

Fig. 16 is a view showing an example of the distribution of the first light flux L1 from the first light source lamp 11 and the distribution of the second light flux L2 from the second light source lamp 12 on the incident end 15a of the light intensity equalizing element 15 of the first embodiment. Figure. In the example shown in Fig. 16, the incident end 15a is a rectangle having a long side and a short side, and the position (first incident position) of the center ray 11c3 of the first light beam L1 at the incident end 15a and the second light beam L2 The position of the center ray 12c (the second incident position) is located at a position shifted from the optical axis 15c of the light intensity equalizing element 15 to the opposite side (the positions of the eccentricities d1 and d2). Further, in the example shown in Fig. 16, the first incident position (the position of the optical axis 11c3 in Fig. 16) and the second incident position (the position of the optical axis 12c in Fig. 16) are the passing light. The intensity equalizes the position of the optical axis 15c of the element 15 on the first reference line H0 extending in the longitudinal direction.

Fig. 17 is a view showing the distribution of the first light beam L1 from the first light source lamp 11 and the distribution of the second light beam L2 from the second light source lamp 12 at the incident end 15a of the light intensity equalizing element 15 of the first embodiment. An example of a picture. In the example shown in Fig. 17, the incident end 15a has a long side and a short side. In the rectangular shape, the position (the first incident position) of the central ray 11c3 of the first light beam L1 and the position of the central ray 12c of the second light beam L2 (the second incident position) in the incident end 15a are located at the light intensity in the longitudinal direction. The optical axis 15c of the homogenizing element 15 is shifted from the opposite side to the opposite side (the position of the eccentricities d1 and d2), and is located on the optical axis 15c of the light intensity equalizing element 15 in the short-side direction. The positions on the opposite sides (the positions of the eccentricities v1 and v2) are shifted from each other. It is preferable to arrange the two beam positions incident on the incident end 15a in the longitudinal direction as shown in FIG. 16 or in the oblique direction (or the diagonal direction) as shown in FIG. The idea of improving the uniformity of illumination on the screen is determined.

Fig. 18 is a view conceptually showing the behavior of loss of light at the incident end 15a of the light intensity equalizing element 15 of the first embodiment. When the first light beam L1 and the second light beam L2 are deviated by the eccentricity amounts d1 and d2, since the concentrated light beam is also concentrated at a position deviating from the eccentricity amounts d1 and d2, it does not enter the incident end of the light intensity equalizing element 15. The beam on 15a (that is, the loss of light that cannot be utilized) is further increased. Further, in Fig. 13 (a) and (b), the loss light directed toward the incident end 15a of the light intensity equalizing element 15 but not entering the incident end 15a is shown as the first light beam L1 and the second light beam L2. The outer side portion of the incident end 15a.

Fig. 6 is a graph showing the calculation results of the simulation of the relationship between the eccentricities d1 and d2 and the light use efficiency B. The simulation in Fig. 6 is an example of calculation when the cross-sectional shape of the light intensity equalizing element 15 is formed by a rectangle of 7 mm × 4.5 mm. In Fig. 6, the light use efficiency B is uniform with respect to the light intensity when the eccentricity amounts d1 and d2 are 0, that is, as shown in Fig. 4 The center light of the light beam of the element 15 is expressed as a ratio of the light use efficiency when the optical axis 15c of the light intensity equalizing element 15 coincides. Strictly speaking, in the simulation of Fig. 6, regarding the second light beam, the light-used efficiency B is obtained without the loss of light blocked by the second curved mirror 13d. Regarding the first light flux, the light use efficiency B shown in Fig. 6 is such that the second curved mirror 13d has a sufficient size, and there is no possibility that it cannot be incident on the incident end 15a because it is not reflected by the second curved mirror 13d. The loss of light.

According to Fig. 6, when the eccentric amount d1 is 0, the light use efficiency B becomes 1. When the eccentric amount d1 is 0.5 mm, the light use efficiency B becomes 0.99, and when the eccentric amount d1 is increased to 1 mm, 1.5 mm, and 2 mm, respectively, the light use efficiency B is lowered to 0.97, 0.92, and 0.84, respectively. In the first embodiment, for example, the eccentric amounts d1 and d2 are both set to 1.5 mm so that the light use efficiency B is as high as 0.9 or more, and the second light flux L2 from the second light source lamp 12 is not easily blocked by the second curved mirror 13d (that is, To ease the interference). However, the eccentricities d1 and d2 can be determined depending on various factors such as the shape, size, arrangement, direction of travel of the light beam, optical characteristics of each structure, and required performance.

In Fig. 6, the cross-sectional shape of the light intensity equalizing element 15 is 7 mm × 4.5 mm, and when the eccentric amount d1 is 1.5 mm, the light intensity equalizing element 15 is as shown in Fig. 13 (a). The distribution of the incident end 15a is also concentrated at a position offset by 1.5 mm. Similarly, when the eccentric amount d2 is set to 1.5 mm, the portion of the incident end 15a of the light intensity equalizing element 15 also has a distribution shifted by 1.5 mm as shown in Fig. 13(b). Thus, when the eccentricities d1 and d2 are set to 1.5 mm, the distribution of the concentrated light beams from the light source lamp 11 and the light source lamp 12 at the incident end 15a of the light intensity equalizing element 15 is as shown in Fig. 2(b). As shown, one of the concentrated light beams of the respective lamps is partially overlapped, so that the light utilization efficiency can be improved.

Fig. 7 is a graph showing the results of simulation calculations showing the relationship between the eccentric amount d3 and the light use efficiency C. As shown in Fig. 4, in the first embodiment, the end portion 13e on the optical axis 15c side of the light intensity equalizing element 15 of the second curved mirror 13d is disposed on the optical axis 15c of the light intensity equalizing element 15 or The optical axis 15c of the light intensity equalizing element 15 is closer to the first light source lamp 11 side (upper side in FIG. 4) to avoid interference with the second light beam L2 from the second light source lamp 12 as much as possible. Fig. 7 shows a simulation result of the light use efficiency C when the eccentric amount d1 in Fig. 4 is fixed to 1.5 mm and the eccentric amount d3 is changed. The light use efficiency C in Fig. 7 is expressed as a ratio of the light use efficiency with respect to the eccentric amount d3 of 1 mm. In Fig. 7, the change in the light use efficiency C when the eccentric amount d3 is changed from 1 mm to 5 mm is shown. As can be seen from Fig. 7, when the eccentric amount d3 is small, the light beam from the relay optical system 13 is blocked by the side surface of the light intensity equalizing element 15 (the upper side of the light intensity equalizing element 15 in Fig. 4), so that light The utilization efficiency C is lowered. It is also known that the light use efficiency C gradually increases when the eccentric amount d3 is continuously increased from 1 mm, and the light use efficiency C reaches the highest when the eccentric amount d3 is 3 mm and 3.5 mm.

In the first embodiment, although two light source lamps are used and the second curved mirror 13d is disposed in the combining portion, one of the light beams from the two light source lamps 11 and 12 may not be incident on the light intensity uniformity. Loss of light from the incident end 15a of the element 15. In the main type of light loss, as shown in Fig. 18, among the light beams from the light source lamp 11, there is no bending reflection. The light beam L11 reflected by the mirror 13d and reflected by the curved mirror 13d but not incident on the incident end 15a of the light intensity equalizing element 15 and the light beam L12 which is not reflected by the curved mirror 13d are uniform toward the self-light intensity The light beam L13 in the direction in which the incident end 15a of the element 15 deviates. Further, among the light beams from the light source lamp 12, the light beam L21 absorbed or reflected on the back surface of the curved mirror 13d and the light beam L22 which cannot be incident on the incident end 15a of the light intensity equalizing element 15 become loss light. The curved mirror 13d is formed such that a large number of first light beams L1 are reflected toward the incident end 15a as much as possible, and the position and size of the blocked second light beam L21 are as small as possible.

In Fig. 7, although the change in the light use efficiency C has been described, since the component of the light loss L11 from the light source lamp 11 is increased when the eccentric amount d3 is small, the light use efficiency of the light source lamp 11 is improved. cut back. On the other hand, as for the light beam from the light source lamp 12, the closer to the incident end 15a of the light intensity equalizing element 15, the more concentrated the light beam is, the smaller the eccentricity d3 is, the less the loss light L21 and L22 become. The light utilization efficiency of the light source lamp 12 is improved. On the other hand, when the eccentric amount d3 is gradually increased, since the light use efficiency of the light source lamp 11 is increased, the light use efficiency of the light source lamp 12 is rather reduced, and thus the light source lamp 11 and the light source lamp 12 are before the eccentric amount d3 reaches a predetermined value. The overall light utilization efficiency C will increase. However, when the eccentric amount d3 exceeds a predetermined value and becomes excessive (when the eccentric amount d3 exceeds 3.5 mm in Fig. 7), the beam diameters of the light source lamp 11 and the light source lamp 12 are both large (i.e., convergence is not performed). In addition, the second curved mirror 13d is disposed to increase the loss of light component, and the light use efficiency C is also lowered.

Figure 8 shows the second curved mirror (final curved reflection) 13d An example of the shape. The curved mirror 13d shown in Fig. 8 is disposed such that the end surface 13e on the side of the light intensity equalizing element 15 is positioned on the optical axis 15c of the light intensity equalizing element 15. In other words, the end surface 13e is disposed so as to be parallel to the center ray of the second light beam L2 (that is, the optical axis 12c). In order to guide the first light flux L1 from the first light source lamp 11 to the incident end 15a of the light intensity equalizing element 15 as much as possible, it is desirable to arrange the reflecting surface 13f of the second curved reflecting mirror 13d as much as possible. On the other hand, in order to avoid interference between the second bending mirror 13d and the second light beam L2 from the second light source lamp 12 as much as possible, it is desirable to reduce the arrangement of the second bending mirror 13d as much as possible. Therefore, as shown in Fig. 8, the end portion 13e on the optical axis 15c side of the light intensity equalizing element 15 of the second curved mirror 13d is configured such that the reflecting surface 13f of the second bending mirror 13d is larger than the back surface 13g. . In Fig. 8, the angle between the reflecting surface 13f of the second bending mirror 13d and the end portion 13e is set to an acute angle (less than 90 degrees), and the end portion 13e and the optical axis 15c are arranged substantially in parallel. It is also possible to set the end portion 13e to have a predetermined angle with the optical axis 15c, and the distance between the end portion 13e and the side of the incident surface 15a and the optical axis 15c is closer to the optical axis than the side of the end portion 13e away from the incident surface 15a. The distance between 15c is still small. Thereby, the light use efficiency of the first light flux L1 from the first light source lamp 11 is increased, and the interference between the second light beam L2 from the second light source lamp 12 and the second curved mirror 13d is also reduced, and the second is The light utilization efficiency of the light source lamp 12 can also be improved.

Fig. 9 is a view showing another example of the shape of the second curved mirror (final curved reflecting portion). The curved mirror 13d2 shown in Fig. 9 is such that the end face 13e2 on the side of the light intensity equalizing element 15 is located at the light intensity equalizing element The configuration is performed on the optical axis 15c of 15. In order to guide the first light flux L1 from the first light source lamp 11 to the incident end 15a of the light intensity equalizing element 15 as much as possible, it is desirable to arrange the reflecting surface 13f2 of the second curved reflecting mirror 13d2 as much as possible. On the other hand, in order to avoid interference between the second bending mirror 13d2 and the second light beam L2 from the second light source lamp 12 as much as possible, it is desirable to reduce the second bending mirror 13d2 as much as possible. Therefore, as shown in Fig. 9, the light intensity equalizing element 15 on the optical axis 15c side of the second bending mirror 13d2, in other words, the end portion 13e2 on the side opposite to the second light beam is formed in a convex curved surface. The reflection surface 13f2 of the second curved mirror 13d2 is made larger than the back surface 13g2. In Fig. 9, the angle between the reflecting surface 13f2 of the second bending mirror 13d2 and the end portion 13e2 is set to an acute angle (less than 90 degrees). The reason why the end portion 13e2 is formed by a convex curved surface is that the angle between the reflecting surface 13f2 and the end surface 13e2 is too small, the structural property is weak, and manufacturing is difficult. Thereby, the corner portion 13h of the end surface 13e of the second curved mirror 13d of Fig. 8 is formed into an arc as indicated by the corner portion 13h2 of the end surface 13e2 of the second curved mirror 13d2 of Fig. 9, which is difficult The second light flux L2 that is directed from the second light source lamp toward the incident end 15a of the light intensity equalizing element 15 is blocked. That is, the end of the light intensity equalizing element 15 forming the reflecting surface 13f2 on the optical axis 15c side is closest to the shape of the center ray of the second light beam (that is, the optical axis 12c of the second light beam L2). In other words, the shape is such that the distance from the side of the center ray of the second light beam L2 closest to the second light beam L2 to the center ray of the second light beam L2 is the first distance and the second curved mirror 13d2 The second light beam L2 is opposite to the center light of the side surface closest to the second light beam L2 to the center light of the second light beam L2 When the distance of the line is the second distance, the first distance is equal to or less than the second distance. When the second curved mirror having the configuration of FIG. 9 is used, the light use efficiency of the first light beam L1 from the first light source lamp 11 is increased, and the second light beam L2 and the second curved reflection from the second light source lamp 12 are increased. The interference of the mirror 13d2 also becomes small, and the light use efficiency of the second light source lamp 12 can also be improved.

Further, in Figs. 8 and 9, the reflection surfaces 13f and 13f2 of the second bending mirrors 13d and 13d2 are configured to be larger than the back surfaces 13g and 13g2, but the optical intensity uniformizing element 15 is optical axis. The shape of the 15c side is applied to the concept. For example, as shown in Fig. 19, in the second curved mirror 13d3, the shape of the back surface 13g3 is the same as the shape of the reflecting surface 13f3 on the optical axis 15c side of the light intensity equalizing element 15, and the reflecting surface The size of 13f3 and the back surface 13g3 are the same. In the case of the configuration shown in Fig. 19, the light use efficiency can be improved in the same manner as in the case of Figs. 8 and 9 as long as the angle between the reflecting surface 13f3 and the end portion (side surface) 13e3 is an acute angle. In other words, the first distance (for example, u1) from the end portion of the reflection surface 13f3 closest to the center ray 12c of the second light beam L2 to the center ray 12c of the second light beam L2 is set to be a side surface. The light utilization efficiency can be improved by the portion of 13e3 that is closest to the center ray 12c of the second light beam L2 to the second distance (for example, u2) of the center ray 12c of the second light beam L2 (i.e., u1 ≦ u2). However, as shown in Fig. 9, even if u1>u2, the light use efficiency can be improved by setting the value of (u1-u2) as small as possible.

As described above, in the projection display apparatus of the first embodiment, the first optical axes 11c1, 11c2, and 11c3 of the first light source lamp 11 and the second optical axis 12c of the second light source lamp 12 do not have each other. Consistent part, Further, since the optical axis 11c3 of the first light flux L1 and the optical axis 12c of the second light flux L2 are arranged substantially in parallel, the light use efficiency can be high, and the light source lamp 11 and the light source lamp 12 are not lost to each other. The composition of the influence.

Further, in the projection display apparatus of the first embodiment, since the light collecting point of the first light source lamp 11 and the second light source lamp 12 is disposed in the vicinity of the incident end 15a of the light intensity equalizing element 15, the light-using efficiency can be provided. High optical system.

Further, in the projection display apparatus of the first embodiment, the relay optical system 13 is disposed between the first light source lamp 11 and the second light collecting point F2, and the first light beam L1 is collected by the light intensity. The vicinity of the incident end 15a of the homogenizing element 15 and the second light flux L2 of the second light source lamp 12 are directly condensed in the vicinity of the incident end 15a of the light intensity equalizing element 15, so that an optical system having high light use efficiency can be provided.

Further, in the projection display apparatus of the first embodiment, the second curved mirror 13d is formed such that the shape of the reflecting surface 13f is different from the shape of the back surface 13g and larger than the back surface 13g, so that the light use efficiency can be improved. Optical system.

Further, in the projection type display device of the first embodiment, the curved mirror 13a or the curved mirror 13d or both may be provided with mirror adjustment means belonging to the curved reflection adjustment portion capable of adjusting the position or angle or both (described later). The mechanism shown in Figure 11)). In this case, even if the size of the light source lamp 11 and the light source lamp 12 are different and the positional shift occurs, the adjustment to the light intensity equalizing element 15 can be adjusted by the adjustment of the mirror adjustment means. The amount of light can provide an optical system with high light utilization efficiency. Further, in the case where such a mirror adjustment means is provided, when only one of the light source lamp 11 or the light source lamp 12 is turned on to light up, the position of the curved mirror 13d is turned to an unlit light source. Side movement (when only the light source lamp 11 is lit, the curved mirror 13d is moved toward the optical axis 12c side of the light source lamp 12; when only the light source lamp 12 is illuminated, the curved mirror 13d is directed to the optical axis 11c of the light source lamp 11 By moving sideways, it is possible to provide an optical system with high light utilization efficiency when one lamp is turned on.

Further, in the projection type display device of the first embodiment, the light source lamp 11 or the light source lamp 12 or both of them may be provided with a light source lamp adjusting means belonging to a light source adjusting portion capable of adjusting a position or an angle or both (described later) Figure 11 shows the mechanism 28). At this time, even when the positions of the light source lamp 11 and the light source lamp 12 are shifted and the sizes are different, the amount of light incident on the light intensity equalizing element 15 can be adjusted by the adjustment of the light source lamp adjusting means, so that light utilization can be provided. Highly efficient optical system.

Further, in the projection display apparatus of the first embodiment, when the light intensity equalizing element 15 is formed by a tubular member having the inner surface as the light reflecting surface, the design of the holding structure of the light intensity equalizing element 15 is facilitated, and heat is dissipated. Performance improvement.

Further, in the projection display apparatus of the first embodiment, when the columnar optical element having a polygonal cross-sectional shape formed of a transparent material is used as the light intensity equalizing element 15, the design of the light intensity equalizing element 15 becomes easy. .

Furthermore, in the projection type display device of the first embodiment, The arrangement is such that the condensed spot is located closer to the light intensity equalizing element 15 than the second curved mirror 13d, so that heat generation of the curved mirror can be suppressed. Therefore, in the projection type display device of the first embodiment, it is not necessary to add a cooling device or the like, and the configuration can be simplified and the cost of the device can be reduced.

(Embodiment 2)

Fig. 10 is a view showing the configuration of a light source device 20 of a projection type display device according to a second embodiment of the present invention. The light source device 20 shown in Fig. 10 can be used as a light source device of the projection display device shown in Fig. 1 (Embodiment 1). In the first light source lamp 21, the second light source lamp 22, and the relay optical system 23 in Fig. 10, respectively, the first light source lamp 11, the second light source lamp 12, and the relay optical system 13 in the first embodiment (the first embodiment) For the same composition. The illuminants 21a and 22a, the ellipsoidal mirrors 21b and 22b, and the optical axes 21c1, 21c2, 21c3, and 22c in Fig. 10 are respectively associated with the illuminants 11a and 12a, the elliptical mirrors 11b and 12b, and the optical axis in Fig. 1, respectively. 11c1, 11c2, 11c3, and 12c have the same configuration. The projection type display device according to the second embodiment differs from the projection type display device according to the first embodiment in the configuration of the light intensity equalizing element 25. As shown in Fig. 10, in the second embodiment, the light intensity equalizing element 25 is arranged side by side in the direction of the optical axis 25c by arranging lens arrays 25a and 25b in which a plurality of lens elements are arranged in two dimensions. And constitute. The first light beam L1 of the first light source lamp 11 and the second light beam of the second light source lamp 12 are guided to the light intensity equalizing element 25 by the lens elements 26a and 26b. According to the light intensity equalizing element 25 having such a configuration, the intensity distribution in the cross section of the illumination beam is made uniform, and illuminance unevenness can be suppressed. Further, according to the projection type display device of the second embodiment, In the case where the light intensity equalizing element is constituted by a rod of an optical member, the size in the direction of the optical axis 25c can be reduced.

Further, in the second embodiment, the configuration is the same as that in the first embodiment except for the above configuration.

(Embodiment 3)

Fig. 11 is a view showing the configuration of a light source device 30 of a projection type display device according to a third embodiment of the present invention. The light source device 30 shown in Fig. 11 can be used as a light source device of the projection display device shown in Fig. 1 (Embodiment 1). The first light source lamp 31, the second light source lamp 32, the relay optical system 33, and the light intensity equalizing element 35 in Fig. 11 are respectively associated with the first light source lamp 11 and the second light source lamp 12 in the first drawing. The optical system 13 and the light intensity equalizing element 15 have the same configuration. The illuminants 31a and 32a, the ellipsoidal mirrors 31b and 32b, the optical axes 31c1, 31c2, 31c3, and 32c, the incident end 35a, the emitting end 35b, and the optical axis 35c in Fig. 11 and the illuminant 11a in Fig. 1, respectively. The 12a, the elliptical mirrors 11b and 12b, the optical axes 11c1, 11c2, 11c3, and 12c, the incident end 15a, the emitting end 15b, and the optical axis 15c have the same configuration. The projection display apparatus according to the third embodiment differs from the projection display apparatus according to the first embodiment in that the projection display apparatus according to the third embodiment is configured to make the optical axes 31c1, 31c2, and 31c3 of the first light beam L1 uniform in light intensity. The first light source lamp 31 and the second light source lamp 32 are disposed such that the optical axis 35c of the element 35 is not parallel, and the optical axis 32c of the second light beam L2 and the optical axis 35c of the light intensity equalizing element 35 are not parallel. The relay optical system 33 and the light intensity equalizing element 35. Therefore, the first light source lamp 31 and the second light source lamp 32 are arranged to be in the first light source lamp. The optical axis 31c1 of the first light beam L1 immediately after the emission of 31 and the optical axis 32c of the second light beam L2 immediately after the second light source lamp 32 are emitted are in a direction in which the distance between the light beams increases as the light beam advances. According to the configuration of the third embodiment, the dimension in the longitudinal direction in the eleventh diagram of the light source device 30 can be shortened.

Further, as shown in Fig. 11, in the projection type display device, the curved mirror 33a or the curved mirror 33d or both may be provided with an adjustable position or angle or both of the mirror adjusting means (mechanism 27). Further, in the projection type display device, the light source lamp 11 or the light source lamp 12 or both may be provided with an adjustable position or angle or both of the light source lamp adjusting means (mechanism 28). Mechanisms 27 and 28 include a mechanical configuration for moving or rotating a structure supporting a curved mirror or a light source. Further, the mechanisms 27 and 28 may be provided with a drive source such as a motor for driving the mechanical structure constituting the mechanisms. Further, the mechanisms 27 and 28 can also be applied to other embodiments.

In addition, in the eleventh figure, the first light source lamp 31 is disposed on the upper side in FIG. 11 and the second light source lamp 32 is disposed on the lower side in FIG. 11, but may be disposed in the opposite direction. Further, the optical axis (31c1 or 32c) of either of the first light source lamp 31 or the second light source lamp 32 may be arranged in parallel with the optical axis 35c of the light intensity equalizing element 35.

The inclination angle of each of the optical axis of the first light beam immediately after the first light source lamp 31 is emitted and the optical axis of the second light beam immediately after the second light source lamp 32 is emitted can be set in the horizontal direction with respect to the eleventh image. In the range of about ±15°, in order to obtain sufficient performance of the first light source lamp 31 and the second light source lamp 32, it is preferable to be in the range of ±5°. Further, considering the ease of configuration of the relay optical system 33, etc., the optical axis of the first light source lamp 31 and the second The inclination angle of the optical axis of the light source lamp 32 is preferably in a range of ±3° with respect to the horizontal direction of Fig. 11 (or the optical axis of the first light source lamp 31 and the light of the second light source lamp 32). The angle of the shaft is within 6°).

Further, in the third embodiment, the configuration is the same as in the first embodiment or the second embodiment except for the above configuration. Further, the first light source lamp 31 or the second light source lamp 32 of the third embodiment can be applied to the light source device of the second embodiment.

(Embodiment 4)

Fig. 12 is a view showing the configuration of a light source device 40 of a projection type display device according to a fourth embodiment of the present invention. The light source device 40 shown in Fig. 12 can be used as a light source device of the projection display device shown in Fig. 1 (Embodiment 1). The first light source lamp 41, the second light source lamp 42, the relay optical system 43, and the light intensity equalizing element 45 in Fig. 12 are respectively associated with the first light source lamp 11 and the second light source lamp 12 in the first drawing. The optical system 13 and the light intensity equalizing element 15 have the same configuration. The illuminants 41a and 42a, the ellipsoidal mirrors 41b and 42b, the optical axes 41c1, 41c2, 41c3, and 42c, the incident end 45a, the emitting end 45b, and the optical axis 45c in Fig. 12 are respectively the illuminants in Fig. 1 The 11a and 12a, the elliptical mirrors 11b and 12b, the optical axes 11c1, 11c2, 11c3, and 12c, the incident end 15a, the emitting end 15b, and the optical axis 15c have the same configuration.

The projection display apparatus according to the fourth embodiment differs from the projection display apparatus according to the first embodiment in that the projection display apparatus according to the fourth embodiment is provided adjacent to the incident end 45a of the light intensity equalizing element 45 for The second curved mirror is not reached among the light beams from the first light source lamp 41 The loss light L5 of 43d is shielded (reflected or absorbed) by the light shielding plate 46 belonging to the light shielding portion. Further, the light shielding plate 46 also shields a light beam that is emitted from the first light source lamp 41 toward the side surface of the light intensity equalizing element 45 (the surface on the upper side of the light intensity equalizing element 45 in Fig. 12) (reflection or absorption) ) function. The material of the light shielding plate 46 may be any material that does not allow light to pass through.

The light shielding plate 46 is preferably disposed at a position that does not block the light beam L1 from the first light source lamp 41 toward the second curved mirror 43d. In addition, it is preferable that the light shielding plate 46 is designed such that the loss light L5 that does not reach the second curved mirror 43d among the light beams from the first light source lamp 41 is blocked as much as possible (length and width), And shape.

As shown in Fig. 12, in the fourth embodiment, the loss light L5 that does not reach the second curved mirror 43d and the light beam from the second light source lamp 42 among the light beams from the first light source lamp 41 can be blocked by the light shielding plate 46. The loss of light is shaded. Therefore, since the loss light from the first light source lamp 41 toward the side surface of the light intensity equalizing element 45 is reduced, there is an effect that the heat intensity of the light intensity equalizing element 45 can be reduced.

Further, in the fourth embodiment, the same as the above-described first embodiment except for the above configuration. Further, the light shielding plate 46 may be applied to the above embodiment 2 or 3.

10, 20, 30, 40‧‧‧ light source devices

11, 21, 31, 41‧‧‧ first light source

11a, 12a, 21a, 22a, 31a, 32a, 41a, 42a‧‧ ‧ illuminants

11b, 12b, 21b, 22b, 31b, 32b, 41b, 42b‧‧‧ elliptical mirror

11c1, 11c2, 11c3, 21c1, 21c2, 21c3, 31c1, 31c2, 31c3, 41c1, 41c2, 41c3, ‧ ‧ the optical axis of the first light source lamp

12, 22, 32, 42‧‧‧2nd light source

12c, 22c, 32c, 42c‧‧‧ the second optical axis of the light source

13, 23, 33, 43‧‧‧ Relay optical system

13a, 23a, 33a, 43a‧‧‧1st curved mirror

Lens components 13b, 13c, 23b, 23c, 26a, 26b, 33b, 33c, 43b, 43c‧‧

13d, 13d2, 23d, 33d, 43d‧‧‧2nd curved mirror

13e, 13e2‧‧‧ the end of the first curved mirror (end face)

13f, 13f2‧‧‧reflecting surface of the first curved mirror

13g, 13g2‧‧‧ the back of the first curved mirror

13h, 13h2‧‧‧ corner of the first curved mirror

15, 25, 35, 45, 115‧‧‧Light intensity equalization components

15a, 25a, 35a, 45a‧‧‧ incident end of light intensity equalization element

15b, 25b, 35b, 45b‧‧‧ the output end of the light intensity equalization element

15c, 25c, 35c, 45c, 115c‧‧‧ optical axis of light intensity equalization element

25a, 25b‧‧‧ lens array

27‧‧‧Mirror adjustment means

28‧‧‧Light source adjustment means

46‧‧ ‧ visor

61‧‧‧Image display components

62‧‧‧Projection optical system

63‧‧‧ screen

111c‧‧‧The optical axis of the light source

D1, d2, d3‧‧‧ eccentricity

L1‧‧‧1st beam

L2‧‧‧2nd beam

L3‧‧‧Emitted light emitted from a light intensity uniformizing element

L4‧‧‧ image light

L5‧‧‧1st loss of light

L10‧‧‧Center light of the first beam

The central light of the L20‧‧‧2nd beam

F1‧‧‧1st light spot

F2‧‧‧2nd spotlight

F3‧‧‧3rd spotlight

Fig. 1 is a view schematically showing the configuration of a projection display apparatus according to a first embodiment of the present invention.

Fig. 2(a) is a view schematically showing a light beam distribution at the incident end of the light intensity equalizing element of the comparative example; (b) is schematically shown in the form of the embodiment. The light intensity distribution of the incident end of the light intensity equalization element of state 1.

Fig. 3 is a layout view schematically showing a curved mirror of a comparative example.

Fig. 4 is a view showing the configuration of a key part of the projection display apparatus of the first embodiment.

Fig. 5 is an explanatory view showing a configuration in which the eccentric amount of the center ray of the first light beam from the first light source lamp and the eccentric amount of the center ray of the second light beam from the second light source lamp are correlated with the light use efficiency. .

Fig. 6 is a graph showing the calculation results showing the relationship between the eccentric amount of the center ray of the first light beam from the first light source lamp and the eccentric amount of the center ray of the second light beam from the second light source lamp and the light use efficiency.

Fig. 7 is a graph showing the calculation result of the relationship between the eccentric amount d3 and the light use efficiency shown in Fig. 4.

Fig. 8 is a view showing an example of the shape of a curved mirror.

Fig. 9 is a view showing another example of the shape of the curved mirror.

Fig. 10 is a view schematically showing the configuration of a projection display apparatus according to a second embodiment of the present invention.

Fig. 11 is a view showing the configuration of a projection display apparatus according to a third embodiment of the present invention.

Fig. 12 is a view showing the configuration of a projection display apparatus according to a fourth embodiment of the present invention.

Fig. 13(a) is a view showing the distribution of the first light beam from the first light source lamp and the eccentric amount of the center light of the first light beam at the incident end of the light intensity equalizing element of the first embodiment, and (b) To show the light intensity uniformization component A plot of the distribution of the second beam from the second source lamp and the amount of eccentricity of the center beam of the second beam at the incident end.

Fig. 14 is a view showing a representative ray of the first light beam having the distribution shown in Fig. 13(a) at the incident end of the light intensity equalizing element.

Fig. 15 is a view showing a representative ray of the second light beam having the distribution shown in Fig. 13(b) at the incident end of the light intensity equalizing element.

Fig. 16 is a view showing an example of the distribution of the first light flux of the first light source lamp from the incident end of the light intensity equalizing element of the first embodiment and the distribution of the second light beam from the second light source lamp.

Fig. 17 is a view showing another example of the distribution of the first light flux of the first light source lamp from the incident end of the light intensity equalizing element of the first embodiment and the distribution of the second light beam from the second light source lamp.

Fig. 18 is a conceptual view conceptually showing the loss of light in the incident end of the light intensity equalizing element of the first embodiment.

Fig. 19 is a view showing an example of the shape of a curved mirror.

10‧‧‧Light source device

11‧‧‧1st light source

11a, 12a‧‧‧ luminous body

11b, 12b‧‧‧Oval mirror

11c1, 11c2, 11c3‧‧‧ the optical axis of the first light source lamp

12‧‧‧2nd light source

12c‧‧‧The optical axis of the second light source

13‧‧‧Relay optical system

13a‧‧‧1st curved mirror

13b‧‧‧Lens components

13d‧‧‧2nd curved mirror

End of 13e‧‧1 first curved mirror (end face)

15‧‧‧Light intensity equalization component

15a‧‧‧Injection end of light intensity equalization element

15b‧‧‧Outlet of the light intensity equalization element

15c‧‧‧The optical axis of the light intensity equalization element

61‧‧‧Image display components

62‧‧‧Projection optical system

L1‧‧‧1st beam

L2‧‧‧2nd beam

L3‧‧‧Emitted light emitted from a light intensity uniformizing element

L4‧‧‧ image light

F1‧‧‧1st light spot

F2‧‧‧2nd spotlight

F3‧‧‧3rd spotlight

Claims (17)

A light source device comprising: a light intensity equalizing portion having an incident end and an emitting end, wherein a light beam incident on the incident end is converted into a light beam whose intensity distribution is uniformized and emitted from the emitting end; and the first light source portion a first light beam is emitted; at least one curved reflecting portion is configured to introduce the first light beam emitted from the first light source portion to the incident end of the light intensity equalizing portion; and the second light source portion is uniform toward the light intensity The second light flux of the incident end of the chemical conversion unit is emitted; and the first light source unit, the second light source unit, and the curved reflection unit are disposed such that the first light source unit reaches the light intensity via the curved reflection unit The optical axis of the first light beam at the incident end of the homogenizing portion does not have a portion that matches the optical axis of the second light beam that reaches the incident end of the light intensity equalizing portion from the second light source portion, and The optical axis of the first light beam immediately before entering the incident end of the light intensity equalizing portion and the aforementioned light reaching the light intensity equalizing portion from the second light source portion The optical axis of the second light beam at the end is substantially parallel to each other, and the final curved reflection portion of the curved reflection portion that is disposed closest to the light intensity equalizing portion has a reflection of the first light beam. a reflecting surface, a back surface of the surface on the back side of the reflecting surface, and a side surface connecting the reflecting surface and the back surface; The shape is such that the first distance from the side of the reflection surface closest to the center ray of the second light beam to the center ray of the second light beam is the closest to the center ray of the second light beam from the side surface The portion is equal to or less than the second distance of the center ray of the second light beam. The light source device according to the first aspect of the invention, wherein the center component of the first light beam emitted from the light-emitting center of the first light source unit and the second light beam of the first light source emit light from the second light source unit The center component of the second light beam emitted from the center is a condensed light beam; and the first light source unit, the second light source unit, the final curved reflection unit, and the light intensity equalizing unit are disposed as follows: The final light collecting point of the center component is located closer to the light intensity equalizing portion than the final curved reflecting portion of the curved reflecting portion disposed closest to the light intensity equalizing portion, and the center component of the second light beam The light collecting point is located closer to the light intensity equalizing portion than the final curved reflecting portion. The light source device according to claim 2, wherein the final curved reflection portion is disposed so as not to block a position of a center ray of the second light beam from the second light source portion toward the incident end. The light source device of claim 2 or 3, wherein the curved reflection adjusting portion has a position or an angle of at least one of the curved reflecting portions or both. The light source device according to any one of claims 1 to 3, wherein the light source adjusting portion is provided to adjust the first and/or second light sources The position or angle of the part or both. The light source device according to any one of claims 1 to 3, wherein a first incident position of the center light of the first light beam incident on the incident end and a second light incident light of the second light beam are incident on the second end of the incident end The incident positions are positions different from each other and are positions deviated from the optical axis of the light intensity equalizing portion. The light source device according to claim 6, wherein the first incident position and the second incident position are shifted from each other by an optical axis of the light intensity equalizing portion. The light source device of claim 6, wherein the incident end is a rectangle having a long side and a short side; and the first incident position and the second incident position are uniform in the longitudinal direction The optical axes of the chemical portions are offset from each other on the opposite side. The light source device according to the eighth aspect of the invention, wherein the first incident position and the second incident position are on a first reference line extending in the longitudinal direction by an optical axis of the light intensity equalizing unit. position. The light source device of claim 6, wherein the incident end is a rectangle having a long side and a short side; and the first incident position and the second incident position are uniform in the longitudinal direction The optical axis of the chemical portion is shifted from the opposite side to the other side, and is shifted from the opposite side to the optical axis of the light intensity equalizing portion in the short side direction. Set. The light source device according to any one of claims 1 to 3, further comprising a light shielding portion provided adjacent to the incident end, for emitting the light from the first light source portion and not incident to the incident The light at the end is shaded. The light source device according to any one of claims 1 to 3, wherein the light intensity equalizing portion includes a tubular member having an inner surface as a light reflecting surface. The light source device according to any one of claims 1 to 3, wherein the light intensity equalizing portion includes a polygonal columnar member made of a transparent material. The light source device according to any one of claims 1 to 3, wherein the light intensity uniform portion includes a lens array in which a plurality of lens elements are arranged in two dimensions. The light source device according to any one of claims 1 to 3, wherein the optical axis immediately after the first light source is emitted and the optical axis immediately after the second light source is emitted The first light source unit and the second light source unit are disposed such that the optical axes of the second light beams are substantially parallel. The light source device of claim 15, wherein an optical axis of the first light beam immediately after being emitted from the first light source unit and an optical axis of the second light beam emitted from the second light source unit are at an angle Become 6. The first light source unit and the second light source unit are disposed inside. A projection type display device having the first to the first patent application scope A light source device of any of the 16 items.