WO2005036255A1 - 照明装置及びこれを備えたプロジェクタ - Google Patents
照明装置及びこれを備えたプロジェクタ Download PDFInfo
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- WO2005036255A1 WO2005036255A1 PCT/JP2004/015109 JP2004015109W WO2005036255A1 WO 2005036255 A1 WO2005036255 A1 WO 2005036255A1 JP 2004015109 W JP2004015109 W JP 2004015109W WO 2005036255 A1 WO2005036255 A1 WO 2005036255A1
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- Prior art keywords
- light
- lens
- concave
- lens array
- lighting device
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2026—Gas discharge type light sources, e.g. arcs
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
Definitions
- the present invention relates to a lighting device and a projector including the same.
- a projector emits illumination light, an electro-optic modulator that modulates illumination light from the illumination device according to an image signal, and projects and displays the modulated light from the electro-optic modulator as a projection image. It has a projection lens.
- the luminance distribution of the projected and displayed image is substantially uniform. Therefore, the illumination device irradiates the illuminated area where the image is formed with a substantially uniform light intensity distribution. Lighting devices using so-called integrator optical systems are used.
- FIG. 7 is a diagram of a conventional lighting device viewed from above.
- FIG. 8 is a view of the first lens array viewed along the optical axis of the light source.
- a conventional lighting device 800 includes a light source device 8100 having an arc tube 820 and an elliptical reflector 830, a collimating lens 840, and a first lens array 8 as shown in FIG. 50, a second lens array 860, and a superimposing lens 870.
- L A is an illuminated area of a liquid crystal device or the like.
- Each optical element is arranged with reference to the light source optical axis 810aX (the central axis of the light beam emitted from the light source device 810). That is, the first lens array 850, the second lens array 860, and the superimposing lens 870 are arranged such that their centers substantially coincide with the light source optical axis 810aX, and It is arranged to be almost perpendicular to 810 ax.
- the arc tube 8200 has a light source (arc) having a predetermined length in the X direction of the light source optical axis 810a, and the center of the light source is the light source.
- the focal point (first focal point) F1 on the side closer to the elliptical reflector 8330 among the two focal points of the elliptical reflector 830 on the optical axis 810aX is located near the position of F1.
- the light emitted from the light emitting section is reflected by the reflecting surface 83 OR of the elliptical reflector 830, and the reflected light is transferred to a focal point (second focal point) F2 farther from the elliptical reflector 830.
- it is made into an illumination light beam substantially parallel to the light source optical axis 810 ax by the collimating lens 840, and enters the first lens array 850.
- the first lens array 850 is composed of a plurality of small lenses 852 having a rectangular outline substantially similar to the shape of the illuminated area LA. (10 rows, 6 columns), and the substantially parallel illumination light beam from the light source device 810 is split into a plurality of partial light beams by a plurality of small lenses 852.
- the second lens array 860 has a configuration in which a plurality of small lenses 862 having a rectangular contour are arranged in a matrix.
- the small lens 862 of the second lens array 860 is placed in correspondence with the small lens 852 of the first lens array 852, and the small lens 862 of the first lens array 85
- Each of the plurality of emitted partial light beams is collected on the corresponding small lens 862.
- each of the plurality of partial light beams emitted from each of the small lenses 862 of the second lens array 860 superimposes and illuminates the illuminated area LA such as a liquid crystal device by the superimposing lens 870. I have.
- the conventional lighting device 800 if the parallelism of the light beam emitted from the light source device 8100 is not sufficient, the small lenses corresponding to each other in the first lens array 850 and the second lens array 860, respectively.
- Lens 8 5 2 The inventor has previously disclosed a technique for increasing the parallelism of a light beam emitted from the light source device 810 because it cannot pass through the light source device 862 (for example, see Patent Document 1).
- the light from the arc tube is not collimated by the combination of the elliptical reflector and the collimating lens, but is Some use a parabolic reflector that can be turned into parallel light when the light is reflected.
- FIG. 9 is a diagram illustrating a problem in a lighting device using a parabolic reflector.
- a lighting device using a parabolic reflector 880 as shown in FIG. 9, in the case of a reflecting surface 880 R composed of a rotating paraboloid of the parabolic reflector 880, an elliptical surface is used.
- the swept angle for guiding the light radially emitted from the arc tube 8200 to the collimating lens 8400 ⁇ becomes smaller.
- the lighting device using the parabolic reflector 880 has a problem that the light use efficiency is lower than the lighting device using the elliptical reflector 830. Therefore, in recent years, lighting devices employing elliptical reflectors have been actively developed.
- a lighting device using such an elliptical reflector has the following problems since the light intensity distribution is not uniform and tends to be deviated toward the light source optical axis.
- FIG. 10 is a diagram schematically showing the trajectory of light in a conventional lighting device using an elliptical reflector.
- FIG. 11 is a diagram for explaining an arc image on the second lens array.
- Fig. 11 (a) is a diagram showing an arc image when ideally formed on the second lens array
- Fig. 11 (b) is a diagram showing the arc image.
- FIG. 4 is a diagram showing an arc image actually formed on a two-lens array.
- the conventional lighting device 800 using the ellipsoidal reflector 830 as shown in FIG.
- the illuminance near the light source optical axis 8100aX is high, and the light source optical axis 8100aX An illuminance distribution in which the illuminance decreases as the distance increases. For this reason, as shown in FIG. 11, an arc image 864 formed on the second lens array 860 is originally formed in each small lens 862 as shown in FIG. 11A. As shown in FIG. 11 (b), the portion that should be accommodated was deviated to the vicinity of the light source optical axis 810 aX and ran out of the cell around the small lens 862.
- the light of the portion which has not been contained in each of the small lenses 862 of the second lens array 860 cannot be used to illuminate the illuminated area, and is wasted.
- the part of the light that protrudes in this way is the light that cannot pass through the corresponding small lenses 852 and 862 in the first lens array 850 and the second lens array 860, respectively.
- the first lens array 850 and the second lens array 860 correspond to each other by increasing the parallelism of the illuminating light flux emitted from the parallelizing lens 840.
- the small lenses 852 and 862 it is possible to pass through the small lenses 852 and 862, in fact, a part of the illuminating light flux in the central portion near the light source optical axis 810aX still cannot pass through. The improvement was desired.
- FIG. 12 is a view for explaining another conventional lighting device 900.
- the optical path L 1 of the central portion centered at least the light source optical axis 9 1 0 a X, the light source optical axis 9 1 0 a X on a flat rows that toward the optical path slightly outward than L 2 optical path L It has been changed to 3 .
- the arc image near the light source optical axis 9110aX is separated better than in the case of the conventional illuminating device 800, and as a result, the elliptical shape is obtained.
- the reflected light reflected by the reflecting surface 930 R of the surface reflector 930 at least the optical path L1 on the center side around the light source optical axis 910aX is the first lens array and the second lens array. Each lens array (both not shown) can pass through the corresponding small lens.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-347292 (FIGS. 1 to 15)
- Patent Document 2 International Publication No. 0 2Z08 8842 Pamphlet (FIG. 1)
- the conical constant K of the hyperboloid of revolution 940A of the concave lens 940 is increased, for example, by increasing the small lens of the first lens array near the optical axis 910aX of the light source. While it became possible to separate the arc images by each other, it was found that the separation of each arc image in the peripheral portion away from the light source optical axis 9110 aX was still insufficient.
- the conical constant K of the rotating hyperboloid 940 A must be further increased. Can be considered. However, when the conic constant K of the rotating hyperboloid 940A is further increased, the rate of change of the lens power at the center of the rotating hyperboloid 940A of the concave lens 940 becomes too large, and the light source optical axis Each arc image in the vicinity of 910 ax is distorted, and a part of the illumination light beam in the vicinity of the light source optical axis 910 ax can pass through the corresponding small lenses in the first lens array and the second lens array. Disappears. As a result, there was a problem that the light quantity loss could not be reduced and the utilization efficiency of the illumination light flux was reduced.
- the present invention has been made to solve such a problem, and an illumination device and a projector having the illumination device, which can reduce the light amount loss and thereby increase the utilization efficiency of the illumination light flux.
- the purpose is to provide.
- the present inventor has set the conic constant K of the rotating hyperboloid to be larger as a means for sufficiently separating each arc image in the peripheral portion away from the light source optical axis.
- a means for arranging a predetermined concave surface between the light incident surface of the concave lens and the surface on which the plurality of small lenses are formed in the first lens array is used.
- the present inventors have found that it becomes possible to effectively suppress the distortion rate of each arc image near the optical axis of the light source due to the rate of change of the lens power at the central portion of the hyperboloid becoming too large, thereby completing the present invention. Was reached.
- a lighting device includes a light source device having an arc tube and an elliptical reflector that reflects light from the arc tube and emits it as an illumination light beam; a rotating hyperboloid that approximately parallelizes the illumination light beam from the light source device.
- a first lens array having a concave lens having a light incident surface made up of: a first lens array having a plurality of small lenses for splitting an illumination light beam from the concave lens into a plurality of partial light beams; A second lens array having a plurality of small lenses corresponding to the plurality of small lenses of the first lens array so as to superimpose the respective partial luminous fluxes divided by the rays on the illuminated area, An illumination light flux passing through the light incident surface of the concave lens together with the light incident surface of the concave lens is provided between the light incident surface of the concave lens and the surface of the first lens array on which the plurality of small lenses are formed.
- a concave surface having a function of traveling along an optical path going outward from an optical path parallel to the optical axis of the light source device and passing small lenses corresponding to each other in the first lens array and the second lens array. Is present.
- a means for further increasing the conic constant K of the rotating hyperboloid is used as a means for sufficiently separating each arc image in a peripheral portion away from the light source optical axis.
- a predetermined concave surface is provided between the light incident surface of the concave lens and the surface of the first lens array on which the plurality of small lenses are formed.
- the arc images can be sufficiently separated.
- it is not necessary to further increase the conic constant K of the hyperboloid of revolution so that the rate of change of the lens power at the center of the hyperboloid of revolution becomes too large and each arc image near the optical axis of the light source is distorted. Is also gone. With this, even with respect to the illumination light beam near the light source optical axis, an arc image formed by the small lenses of the first lens array can be favorably formed in each corresponding small lens of the second lens array.
- the function of sufficiently separating each arc image in the peripheral portion distant from the light source optical axis is performed by using the hyperboloid of revolution of the concave lens, the light incident surface of the concave lens, and the plurality of the first lens array. Since it is set to a predetermined concave surface located between the small lens and the surface on which the small lens is formed, the conic constant K of the hyperboloid of revolution can be increased without further increasing the conic constant K of the light source.
- Each arc image at the peripheral portion distant from the object can be separated by + minutes (this can achieve the object of the present invention).
- the lighting device of the present invention is a lighting device that can reduce the light amount loss and can increase the utilization efficiency of the illumination light flux.
- the concave surface is preferably a spherical surface.
- the concave surface is formed on a light exit surface of the concave lens.
- the plurality of small lenses of the first lens array may be formed on a light exit surface of the first lens array, and the concave surface may be a light incident surface of the first lens array. It is preferably formed in With such a configuration, the object of the present invention can be achieved without adding a new optical element.
- a second concave lens is disposed between the concave lens and the first lens array, and the concave surface is one of a light incident surface and a light exit surface of the second concave lens. Preferably, it is formed on at least one surface.
- a projector according to the present invention includes: a lighting device according to the present invention; an electro-optic modulator that modulates an illumination light beam from the lighting device according to image information; and a projection optical system that projects modulated light from the electro-optic modulator. It is characterized by having. For this reason, according to the projector of the present invention, a high-brightness projector can be provided because it is provided with an excellent illuminating device that can reduce the light amount loss and thus can increase the utilization efficiency of the illuminating light flux.
- FIG. 1 is a diagram of the optical system of the projector according to the first embodiment as viewed from above.
- FIG. 2 is a view for explaining the lighting device according to the first embodiment.
- FIG. 3 is a diagram for explaining a lighting device according to Comparative Example 1.
- FIG. 4 is a diagram for explaining a lighting device according to Comparative Example 2.
- FIG. 5 is a view for explaining the lighting device according to the second embodiment.
- FIG. 6 is a diagram for explaining a lighting device according to the third embodiment.
- FIG. 7 is a diagram of a conventional lighting device viewed from above.
- FIG. 8 is a view of the first lens array viewed along the optical axis of the light source.
- FIG. 9 is a diagram illustrating a problem in a lighting device using a parabolic reflector.
- Fig. 1 ⁇ is a diagram schematically showing the trajectory of light rays in a conventional lighting device using an elliptical reflector.
- FIG. 11 is a diagram for explaining an arc image on the second lens array.
- FIG. 12 is a diagram shown to explain another conventional lighting device. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram of the optical system of the projector according to the first embodiment as viewed from above.
- three directions perpendicular to each other are referred to as a z direction (a direction parallel to the light source optical axis 110a X) and an X direction (a direction perpendicular to the z direction and parallel to the paper).
- Y direction perpendicular to the paper).
- the projector 1A includes an illumination device 100A, a color separation optical system 200, a relay optical system 300, and an electro-optical modulator 3 It has four liquid crystal devices 400 R, 400 G, 400 B, a cross dichroic prism 500, and a projection optical system 600. The components of each optical system are arranged substantially horizontally around the cross dichroic prism 500.
- the lighting device 100 A is obtained by superimposing a light source device 110, a collimating lens 144 A, a first lens array 150, a second lens array 160, and a polarization conversion element 170.
- Lens 180 The illumination light beam emitted from the light source device 110 is substantially collimated on the light incident surface of the concave lens 140A, is divided into a plurality of partial light beams by the first lens array 150, and each partial light beam is The image is superimposed on the image forming areas of the three liquid crystal devices 400 R, 400 G, and 400 B to be illuminated by the lens array 160 and the superimposing lens 180.
- the color separation optical system 200 has a function of separating the illumination light beams emitted from the illumination device 100A into three color illumination light beams of different wavelength ranges.
- the first dichroic mirror 210 reflects a substantially blue light beam (hereinafter, referred to as “B light”), a substantially green light beam (hereinafter, referred to as “G light”), and a substantially red light beam (hereinafter, referred to as “G light”). This is called “R light.” 1st dike mouth
- the B light reflected by the reflection mirror 210 is further reflected by the reflection mirror 230, passes through the field lens 240B, and illuminates the liquid crystal device 400B for B light.
- the field lens 240B condenses the plurality of partial light beams from the illumination device 100A so as to illuminate the liquid crystal device 400B for B light. Normally, each partial light beam is set to be a substantially parallel light beam.
- Field lenses 240 G and 350 arranged in front of the other liquid crystal devices 400 G and 400 R have the same configuration as the field lens 240 B.
- the G light and the R light transmitted through the first dichroic mirror 210 the G light is reflected by the second dichroic mirror 220 and transmitted through the fin lens 240G for the G light.
- the liquid crystal device 400 G is illuminated.
- the R light passes through the second dichroic mirror 220, passes through the relay optical system 300, and illuminates the liquid crystal device 400R for the R light.
- the relay optical system 300 has an entrance-side lens 310, an entrance-side reflection mirror 320, a relay lens 330, an exit-side reflection mirror 340, and a field lens 350.
- the R light emitted from the color separation optical system 2000 converges near the relay lens 330 by the entrance lens 310 and travels toward the exit-side reflection mirror 340 and the field lens 350. Diverge.
- the size of the light beam incident on the field lens 350 is set to be substantially equal to the size of the light beam incident on the incident side lens 310.
- the liquid crystal devices 400 R, 400 G, and 400 B for each color light convert the color light incident on each light incident surface into light corresponding to the corresponding image signal, and these conversions are performed.
- the emitted light is emitted as transmitted light.
- incident-side polarizers 918R, 91.8G, and 918B are disposed, respectively, and on the exit side, the exit side Polarizing plates 920 R, 920 G, and 920 B are disposed, respectively.
- LCD device 400 R, 400 G, As 400B a transmission type liquid crystal device is used.
- the cross dichroic prism 500 has a function as a color synthesizing optical system that synthesizes converted light of each color light emitted from the liquid crystal devices 400 R, 400 G, and 400 B for each color light. . Further, it has an R light reflecting dichroic surface 510B for reflecting the R light, and a B light reflecting dichroic surface 5110B for reflecting the B light.
- the R light reflecting dichroic surface 510 R and the B light reflecting dichroic surface 510 B are a dielectric multilayer film that reflects R light and a dielectric multilayer film that reflects B light at the interface of four right-angle prisms. It is provided by being formed in a substantially X-shape.
- the three reflected dichroic surfaces 510R and 510B combine the three colors of converted light to generate light for displaying a color image.
- the combined light generated in the cross dichroic prism 500 is emitted toward the projection optical system 600.
- the projection optical system 600 is configured to project the combined light from the cross dichroic prism 500 as a display image on a projection surface such as a screen.
- FIG. 2 is a diagram shown to explain the lighting device according to the first embodiment.
- FIG. 2A is a view of a part of the illumination device as viewed from above
- FIG. 2B is a view showing an arc image on the second lens array.
- the lighting device 10 OA according to the first embodiment includes a light source device 110, a concave lens 14 OA, a first lens array 150, and a second lens. It has an array 160, a polarization conversion element 170, and a superimposing lens 180.
- the light source device 110 includes an arc tube 120, an auxiliary mirror 122, and an elliptical reflector 130.
- the arc tube 120 has its emission center located near the position of the first focal point F i of the elliptical reflector 130.
- the reflector 130 opens to the side of the illuminated area, and is arranged behind the light emitting portion of the arc tube 120.
- the light from the arc tube 120 is reflected and emitted to the illuminated area side.
- the auxiliary mirror 1 2 2 is formed of a reflective concave body disposed closer to the illuminated area than the light emitting section of the arc tube 1 20.
- the auxiliary mirror 1 2 3 illuminates the light radiated from the light emitting section to the illuminated area 1 3 It is configured to reflect light to 0 and improve light use efficiency.
- the concave lens 14OA has a lens optical axis parallel to the light source optical axis 110aX, and is arranged on the illuminated area side of the light source device 110.
- a hyperboloid of revolution 1400As1 for substantially parallelizing the illuminating light beam from the light source device 110 is formed, and on the light exit surface, a concave surface 1 of a spherical surface is formed. 40 As2 is formed.
- the concave surface 14 OA s 2 outputs the illuminating light beam that has passed through the rotational hyperboloid 140 A s 1 together with the rotational hyperboloid 140 A s i and the light source optical axis 1 1 0 a X
- the optical axis of the light source device 110 The small lenses that travel along an optical path that is more outward than the optical path parallel to the light source device 110, and that correspond to each other in the first lens array 150 and the second lens array 160. It has the function of passing 152,162.
- the first lens array 150 has a plurality of small lenses 152 arranged in a matrix, and is configured to split the illumination light beam from the light source device 110 into a plurality of partial light beams. I have.
- Each of the small lenses 152 is formed such that the external shape when viewed along the z direction is substantially similar to the shape of the illuminated area.
- the second lens array 160 has a plurality of small lenses 16 2 corresponding to the plurality of small lenses 15 2 in the first lens array 150, respectively.
- Each small lens 16 2 has a first lens array 1 As in the case of each of the 50 small lenses 15 2, they are arranged in a matrix, and the arc image by the multiple small lenses 15 2 of the first lens array 150 is covered together with the superimposed lens 180. Lighting area It is configured to superimpose illumination on top.
- the polarization conversion element 170 has a function of aligning non-polarized light into polarized light having a polarization direction usable in the three liquid crystal devices 400R, 400G, and 400B. Further, on the light incident surface of the polarization conversion element 170, a light shielding plate (not shown) for shielding undesired light from the second lens array 160 or the like is arranged.
- the superimposing lens 180 is composed of a condenser lens, and is arranged on the illuminated area side of the polarization conversion element 140.
- the illumination light flux emitted from the polarization conversion element 140 is condensed and superimposed on the image forming area of the liquid crystal device 40 OR, 400 G, or 400 B together with the second lens array 160. I have.
- the concave surface 140As2 is formed as the light exit surface of the concave lens 140A.
- a cone of the rotating hyperboloid 140As1 is used as a means for sufficiently separating each arc image in a peripheral portion away from the light source optical axis 110aX.
- a predetermined concave surface 140 As is provided between the light incident surface of the concave lens 140 A and the surface of the first lens array 150 on which the plurality of small lenses 152 are formed. Since 2 is present, it becomes possible to sufficiently separate each arc image in a peripheral portion away from the light source optical axis 110 ax.
- the function of sufficiently separating each arc image in the peripheral portion distant from the light source optical axis 110aX is provided by the rotating hyperboloid 140Asi of the concave lens 140A.
- the lighting device 100A according to the first embodiment is a lighting device that can reduce the light amount loss and thereby increase the utilization efficiency of the illumination light flux.
- concave surface 140As2 is a spherical surface. Therefore, the object of the present invention can be achieved by a relatively simple and easy method.
- the concave surface 140As2 is formed on the light exit surface of the concave lens 14OA. Therefore, the object of the present invention can be achieved without adding a new optical element.
- FIG. 3 is a view for explaining a lighting device according to Comparative Example 1.
- FIG. 3 (a) is a view of a part of the lighting device as viewed from above
- FIG. 3 (b) is a view showing an arc image on the second lens array.
- Figure 4 shows the lighting according to Comparative Example 2. It is a figure shown in order to explain an apparatus.
- FIG. 4 (a) is a view of a part of the lighting device as viewed from above
- FIG. 4 (b) is a view showing an arc image on the second lens array.
- the illumination device 110A according to Comparative Example 1 has a light incident surface having a rotating hyperboloid 11 1 as in the case of the conventional illumination device 800 (see FIG. 7). 40Asi, and has a concave lens 114OA whose light emission surface is a plane 114AS2.
- the arc image formed on the second lens array 160 originally fits within each small lens 162. It can be seen that the spot should be deviated near the optical axis of the light source 110aX and protrude into the cells around the small lens 162.
- the lighting device 1100B according to Comparative Example 2 has a light incident surface having a conical constant K as in the case of the conventional lighting device 900 (see FIG. 12). It has a concave lens 1 140 B whose enlarged hyperboloid is 1 140 B s 1 and whose light exit surface is a plane 1 140 B s 2.
- the lighting device 110B according to the comparative example 2 as shown in FIG. 4B, the arc images near the light source optical axis 110aX are certainly separated from each other. However, it can be seen that the separation of each arc image in the peripheral part away from the light source optical axis 110 aX is still insufficient.
- the ratio of irradiation to the region M2 corresponding to the light shielding plate of the polarization conversion element 170 (not shown) is large, and the ratio of irradiation to the region Ml corresponding to the light incident surface of the polarization conversion element 170. Is reduced, and the light use efficiency is reduced.
- the arc image near the light source optical axis 110aX also extends from the light source optical axis 110aX. It can be seen that the arc images at the distant peripheral part are also well separated.
- the ratio of irradiation of the region M2 corresponding to the light shielding plate of the polarization conversion element 170 also decreases, and the ratio of irradiation to the region Ml of the polarization conversion element 170 corresponding to the light incident surface becomes smaller. It will not be reduced and light use efficiency will be reduced.
- the lighting device 100A according to the first embodiment reduces the light amount loss, as is clear from the comparison with the lighting devices 1100A and 1100B according to Comparative Example 1 or 2 described above. Therefore, the lighting device can improve the efficiency of using the luminous flux.
- the projector 1A includes the above-described illumination device 100A and a liquid crystal device 400R that modulates the illumination light beam from the illumination device 100A according to image information. 400 G, 400 B, and a projection optical system 600 that projects modulated light from the liquid crystal device 40 OR, 400 G, 400 B.
- the optimal combination of the elliptical reflector 13 0 and concave lens 14 OA is such that the illuminating light beam that has passed through the light entrance surface of the concave lens 1 40 A can be converted into ideal parallel light.
- the lighting device 100A according to the first embodiment and the lighting devices 100B and 100C according to the second or third embodiment described later will be described in this state based on the state of the combination. By making various changes, the object of the present invention can be achieved.
- r and Z are the origin at the intersection of the light entrance surface of the concave lens 14 OA and the light source 1 10 a X R 1 0 a r Coordinate value in a cylindrical coordinate system that is axisymmetric with respect to X.
- r is the distance from the origin in the direction perpendicular to the optical axis
- Z is the distance from the origin in the direction of the optical axis.
- c is the paraxial radius of curvature.
- K is a value called the conic constant.
- the value of the conic constant K is K-1.
- the paraxial radius of curvature c is determined by the shape of the reflecting surface of the elliptical reflector 140, the refractive index of the concave lens 14OA, the thickness of the center of the concave lens 140A, and the installation position of the concave lens 140A. It is required in consideration of. Specifically, the shape of the reflecting surface of the elliptical reflector 130, the refractive index of the concave lens 14OA, the thickness of the center of the HA lens 140A, and the installation position of the concave lens 140A are determined in advance. Keep it.
- the refractive index and the thickness of the central portion are the same as those of the concave lens 14 OA at a predetermined position.
- the combination of the elliptical reflector 130 and the concave lens 14OA, that is, the elliptical reflector 13 The shape of the reflecting surface of 0, the installation position of the concave lens 140A, and the paraxial curvature radius c are determined.
- the optical power at the center of the hyperboloid of revolution can be increased.
- the value of the conic constant K it is possible to gradually change the optical path of the illumination light beam parallel to the light source optical axis 110aX to the outward optical path.
- the value of the second lens array is deviated toward the light source optical axis, Arc images can be gradually separated in a radial direction.
- the value of the cone constant K in the hyperboloid of revolution 140As1 of the concave lens 14OA is set as the initial value, and the cone constant K is gradually increased.
- the conic constant K and the radius of curvature R when the arc image deviated to the X-side of the light source optical axis is located within the small lens 16 2, which should be originally contained, are calculated by the rotational hyperboloid 1 of the concave lens 14 OA.
- Other configurations (such as the shape of the reflecting surface of the elliptical reflector 130 and the installation position of the concave lens 14 OA) are used when the illumination light beam passing through the light incident surface of the concave lens 14 OA can be converted into ideal parallel light.
- each arc image by the small lens 15 of the first lens array 150 is stored in the corresponding small lens 16 of the second lens array 16 respectively. This makes it possible to reduce the light amount loss and increase the utilization efficiency of the illumination light flux.
- FIG. 5 is a diagram for explaining a lighting device according to the second embodiment.
- the same members as those in FIG. 2 (a) are denoted by the same reference numerals, and detailed description is omitted.
- the lighting device 100B includes, as shown in FIG. 5, a light incident surface of the first lens array 150B (opposite to the surface on which the plurality of small lenses 152B are formed)
- the illumination light flux passing through the light incident surface of the concave lens 140 along with the hyperboloid of revolution 1400 s 1 formed on the light incident surface of the concave lens 140 is applied to the light source optical axis 1 110 aX.
- Small lenses 15 2 B and 16 2 which travel along an optical path that is more outward than the parallel optical paths and correspond to each other in the first lens array 150 B and the second lens array 160. It is characterized in that a concave surface 150 Bsi formed of a spherical surface having a function of passing light is formed. .
- a rotating hyperboloid 140 S instead of using the means for further increasing the conic constant K of 1 , the light incidence surface of the concave lens 140 and the surface of the first lens array 150 B where the plurality of small lenses 15 2 B are formed Since the concave surface 150 B s 1 as described above was present between them, each arc image at the peripheral portion distant from the light source optical axis 110 a X was + It can be separated into minutes.
- the lighting device 100B according to the second embodiment is a lighting device that can reduce the light amount loss and thereby increase the use efficiency of the illumination light flux.
- the plurality of small lenses 150B of the first lens array 150B emit light from the first lens array 150B.
- the concave surface 150Bsi is formed on the light incident surface of the first lens array 150B. Therefore, the object of the present invention can be achieved without adding a new optical element.
- the hyperboloid of rotation 144 s of the concave lens 14 ⁇ Regarding the conic constant K of 1 and the radius of curvature R of the concave surface 150 Bs ⁇ of the spherical surface of the first lens array 150 B, the design of each optical element in the illumination device 10 OA according to the first embodiment described above. It can be determined by a design method similar to the method.
- FIG. 6 is a view for explaining a lighting device according to the third embodiment.
- the illumination device 100 C includes a rotation unit formed between the concave lens 140 and the first lens array 150 and formed on the light incident surface of the concave lens 140.
- the illuminating luminous flux that has passed through the light entrance surface of the concave lens 140 travels along an optical path that is more outward than an optical path parallel to the light source optical axis 110 a X , and
- the feature is that 2 is arranged.
- a rotating hyperboloid 140 si instead of using a means to further increase the conic constant K of the lens, the light incident surface of the concave lens 140 and the surface of the first lens array 150 on which the plurality of small lenses 15 since it was decided to present the concave 1 4 2 s 2 as described above, it is possible to sufficiently separate the arc image in the away peripheral portion from the light source optical axis 1 1 0 a X.
- the lighting device 100 C according to Embodiment 3 can reduce the light amount loss, and thus can increase the utilization efficiency of the illumination light flux. Be placed.
- the second concave lens 142 is disposed between the concave lens 140 and the first lens array 150.
- the concave surface 142 S2 is formed on the light exit surface of the second H0 lens 142. Therefore, the object of the present invention can be achieved only by adding one second lens 142 as described above to the configuration of the conventional lighting device.
- the concave surface 144 s 2 is formed on the light exit surface of the second concave lens 144 has been described.
- the present invention is not limited thereto, and a concave surface may be formed on the light incident surface of the second concave lens, or concave surfaces may be formed on both the light incident surface and the light exit surface of the second concave lens.
- the hyperboloid of revolution 14 of the concave lenses 140 is used.
- a spherical surface is used as the predetermined concave surface.
- the present invention is not limited to this, and various aspheric surfaces can be used as the predetermined concave surface.
- transmission type means that an electro-optic modulator as a light modulating means is a type that transmits light, such as a transmission type liquid crystal device
- reflection type means This means that an electro-optic modulator as a light modulator such as a reflection type liquid crystal device reflects light. Even when the illumination device of the present invention is applied to a reflection type projector, almost the same effects as those of a transmission type projector can be obtained.
- the power described as an example of the projector that displays a color image is not limited thereto.
- the present invention is also applicable to a projector that displays a monochrome image.
- a projector using three liquid crystal devices 400R, 400G, and 400B has been described as an example, but the present invention is not limited to this.
- the present invention is also applicable to a projector using two or four or more liquid crystal devices.
- the liquid crystal devices 400R, 400G, and 400B are used as the electro-optical modulation devices, but the present invention is not limited to this.
- the electro-optic modulator generally, any device that modulates incident light according to image information may be used, and a micromirror-type light modulator may be used.
- the micromirror type optical modulator for example, DMD (Digital Micromirror Device) (trademark of Texas Instruments Company, USA) can be used.
- the present invention can be applied to a front projection type projector that projects from the side where a projected image is observed and a rear projection type projector that projects from the side opposite to the side where a projected image is observed.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005514643A JPWO2005036255A1 (ja) | 2003-10-07 | 2004-10-06 | 照明装置及びこれを備えたプロジェクタ |
DE602004022567T DE602004022567D1 (de) | 2003-10-07 | 2004-10-06 | Beleuchtungseinheit und projektor damit |
EP04792344A EP1672421B1 (en) | 2003-10-07 | 2004-10-06 | Illumination unit and projector comprising it |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-348417 | 2003-10-07 | ||
JP2003348417 | 2003-10-07 |
Publications (1)
Publication Number | Publication Date |
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WO2005036255A1 true WO2005036255A1 (ja) | 2005-04-21 |
Family
ID=34430960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/015109 WO2005036255A1 (ja) | 2003-10-07 | 2004-10-06 | 照明装置及びこれを備えたプロジェクタ |
Country Status (6)
Country | Link |
---|---|
US (1) | US7150535B2 (ja) |
EP (1) | EP1672421B1 (ja) |
JP (1) | JPWO2005036255A1 (ja) |
CN (1) | CN100504580C (ja) |
DE (1) | DE602004022567D1 (ja) |
WO (1) | WO2005036255A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7806530B2 (en) | 2005-09-09 | 2010-10-05 | Sanyo Electric Co., Ltd. | Projector device |
JP2013167748A (ja) * | 2012-02-15 | 2013-08-29 | Canon Inc | 照明光学系および画像投射装置 |
WO2017068676A1 (ja) * | 2015-10-22 | 2017-04-27 | 日立マクセル株式会社 | 投射型映像表示装置 |
CN108613099A (zh) * | 2016-12-16 | 2018-10-02 | 市光法雷奥(佛山)汽车照明系统有限公司 | 用于机动车辆的多功能发光装置 |
Families Citing this family (10)
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SG142126A1 (en) * | 2003-10-28 | 2008-05-28 | Sony Corp | A waveguide system, a device for displaying an image using such a system and a method for displaying an image |
JP4904741B2 (ja) * | 2005-08-09 | 2012-03-28 | 株式会社日立製作所 | 投射型映像表示装置および遮光方法 |
JP4678441B2 (ja) * | 2009-02-18 | 2011-04-27 | セイコーエプソン株式会社 | 光源装置およびプロジェクター |
KR101091236B1 (ko) * | 2010-04-02 | 2011-12-07 | 엘지이노텍 주식회사 | 프로젝터 광학계 |
JP6078976B2 (ja) * | 2012-04-12 | 2017-02-15 | セイコーエプソン株式会社 | プロジェクター |
JP6284098B2 (ja) * | 2013-11-05 | 2018-02-28 | パナソニックIpマネジメント株式会社 | 照明装置 |
TWI737720B (zh) * | 2017-04-28 | 2021-09-01 | 揚明光學股份有限公司 | 透鏡 |
JP7087828B2 (ja) * | 2018-08-27 | 2022-06-21 | セイコーエプソン株式会社 | 光学素子、光射出装置および画像表示システム |
CN109323168B (zh) * | 2018-09-30 | 2023-11-10 | 芯龙创新光电(昆山)有限公司 | 一种户外型地面安装投光灯 |
CN110425461B (zh) * | 2019-08-27 | 2024-04-30 | 佛山市华创医疗科技有限公司 | 一种口腔灯 |
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- 2004-10-05 US US10/957,673 patent/US7150535B2/en not_active Expired - Fee Related
- 2004-10-06 DE DE602004022567T patent/DE602004022567D1/de active Active
- 2004-10-06 EP EP04792344A patent/EP1672421B1/en not_active Ceased
- 2004-10-06 CN CNB2004800211628A patent/CN100504580C/zh not_active Expired - Fee Related
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- 2004-10-06 JP JP2005514643A patent/JPWO2005036255A1/ja active Pending
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Publication number | Priority date | Publication date | Assignee | Title |
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US7806530B2 (en) | 2005-09-09 | 2010-10-05 | Sanyo Electric Co., Ltd. | Projector device |
JP2013167748A (ja) * | 2012-02-15 | 2013-08-29 | Canon Inc | 照明光学系および画像投射装置 |
WO2017068676A1 (ja) * | 2015-10-22 | 2017-04-27 | 日立マクセル株式会社 | 投射型映像表示装置 |
JPWO2017068676A1 (ja) * | 2015-10-22 | 2018-07-05 | マクセル株式会社 | 投射型映像表示装置 |
US10295895B2 (en) | 2015-10-22 | 2019-05-21 | Maxell, Ltd. | Projection type image display apparatus for improving illumination of a light source |
CN108613099A (zh) * | 2016-12-16 | 2018-10-02 | 市光法雷奥(佛山)汽车照明系统有限公司 | 用于机动车辆的多功能发光装置 |
CN108613099B (zh) * | 2016-12-16 | 2024-02-23 | 市光法雷奥(佛山)汽车照明系统有限公司 | 用于机动车辆的多功能发光装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1672421A1 (en) | 2006-06-21 |
JPWO2005036255A1 (ja) | 2006-12-21 |
CN100504580C (zh) | 2009-06-24 |
DE602004022567D1 (de) | 2009-09-24 |
EP1672421A4 (en) | 2006-11-02 |
EP1672421B1 (en) | 2009-08-12 |
US20050157268A1 (en) | 2005-07-21 |
US7150535B2 (en) | 2006-12-19 |
CN1826558A (zh) | 2006-08-30 |
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