JP3972940B2 - Light source device and projection display device - Google Patents

Description

  The present invention relates to a light source device including a plurality of light source lamps suitable for use in a projection display device. The present invention also relates to a projection display device incorporating this light source device.

  A light source device used as a light source of a projection display device includes a lamp body such as a metal halide lamp, a xenon lamp, or a halogen lamp, and a lamp reflector that reflects diverging light from the lamp body and emits it as a light beam from a front opening. The light source lamp and a lamp housing to which the light source lamp is assembled are generally used in a unit form. However, in a projection display device equipped with such a light source device, if the lamp body does not turn on due to its lifetime, illumination light cannot be obtained from the light source device, and nothing is displayed on the screen. End up. As a result, it is necessary to temporarily interrupt the projection in order to replace the light source device, or to cause discomfort to the user.

  In order to avoid the above-described adverse effects, the present applicant has proposed a light source device having a configuration including a plurality of light source lamps including a lamp body and a lamp reflector in Japanese Patent Laid-Open No. 6-265887.

JP-A-6-265887

  FIG. 7 shows a schematic configuration of a light source device disclosed in Japanese Patent Laid-Open No. 6-265887. In the figure, an integrator lens, which is a uniform illumination element, is also shown as an irradiated portion of illumination light obtained from the light source device. The light source device 200 shown in this figure includes two light source lamps 20A and 20B, and these light source lamps 20A and 20B are housed in a lamp housing 23. As described above, the two light source lamps 20A and 20B include the lamp main bodies 21A and 21B, and the lamp reflectors 22A and 22B that reflect the divergent light from the lamp main bodies 21A and 21B and emit the light from the front opening as light beams. It basically consists of In such a light source device 200, illumination light can be obtained from the other light source lamp even if one of the light source lamps is not lit due to the lifetime.

  However, if the two light source lamps 20A and 20B are simply arranged without considering the thickness of the lamp reflectors 22A and 22B, the size of the lamp housing 23, etc., there is a wasteful space between the two light source lamps 20A and 20B. appear. If there is such a space, as can be seen from FIG. 7B, the light beams W1 and W2 emitted from the respective light source lamps 20A and 20B are irradiated in a separated state. growing.

  When such a light source device 200 is used as a light source of a projection display device, the width Wt of the irradiated region is large, and as shown by the broken line in FIG. Compared with the case where the width Wt of the region is small, the light is angled. For this reason, a large aperture projection lens 71 having a larger entrance pupil diameter is required. Further, as shown in FIG. 8B, the projection lens 71 inverts the diverging light and projects it onto the projection surface 11. Therefore, when the same projection lens 71 is used, the projection distance increases as the divergence angle increases. Become. Since the loss of light increases as the projection distance increases, a projection lens 71 having a short focal length is required to reduce the light loss. Therefore, when the width Wt of the irradiated region is large, it is necessary to use a projection lens having a small F number and a large aperture in order to obtain a bright projection image while preventing a decrease in light utilization efficiency. However, since such a projection lens is expensive, the cost of the projection display device increases.

  9A and 9B, if there is a useless space between the light source lamps 20A and 20B and the width Wt of the irradiated region is large, the light valve 5 is passed through the uniform illumination optical system 300. In the light to be illuminated, light incident with a large condensing angle is generated. Therefore, when a light valve having a viewing angle dependency such as a liquid crystal light valve is used, it is greatly affected by the viewing angle characteristics, causing display unevenness and the like in the projected image, leading to a reduction in display quality.

  In view of the above points, an object of the present invention is to provide a light source device having a plurality of light source lamps by narrowing the width of a region to be irradiated with illumination light emitted from the light source device so as to have a large aperture with a small F number. To provide a light source device suitable for use as a light source or the like of a projection display device capable of projecting a high-quality image without using a projection lens and without being affected by the viewing angle characteristics of a light valve. . Another object of the present invention is to provide a projection display device using this light source device as a light source.

In order to solve the above-mentioned problems, in the present invention, in a light source device having a plurality of light source lamps, the light flux from each of the light source lamps is connected to each other by the light guide means, thereby narrowing the width of the illumination light irradiated area. I am doing so. That is, the present invention includes a first light source lamp that emits a first light beam and a second light source lamp that emits a second light beam, and the first and second light source lamps are respectively In a light source device configured to include a lamp body and a reflecting mirror that reflects diverging light from the lamp body and emits the first or second light flux from a front opening, the light source device is located at positions separated from each other. Light guide means for receiving the first and second light beams emitted in a state of being separated from the front opening of each light source lamp and emitting the light beams in the same direction in the state of light beams interconnected with each other; The first and second light source lamps are arranged in a state in which both optical axes intersect with each other, the front openings of the first and second light source lamps are circular, and the light guiding means is , The first light flux A light guide element having a cross-section perpendicular to the axis in a state of an annular light beam, and an annular light beam formed by the light guide element so as to surround the second light beam. The light guide means emits the first light flux in a state of being surrounded by the second light flux and connected to the second light flux. It is said.

  According to the light source device having this configuration, when both the first and second light sources are lit, it is possible to obtain emitted light having a substantially circular cross section. When this light source device is employed in a projection display device, Is highly efficient in entraining the projection lens, and a bright image can be obtained. In addition, even when one of the light source lamps is not turned on, it is possible to obtain emitted light that is symmetric with respect to the central portion of the irradiated portion. Therefore, the light source lamp is used as a light source for a projection display device using a uniform illumination optical system In such a case, there is an advantage that unevenness hardly occurs in the light that illuminates the light valve, and accordingly, unevenness does not easily occur in the projected image.

In the present invention, it is desirable that first and second uniform illumination optical elements are respectively disposed in the front openings of the first and second light source lamps. If such a light source device is used as the light source of the projection display device, there is no need to separately provide a uniform illumination optical system, which has the advantage that the projection display device can be reduced in size and cost.

  The light source device of the present invention, for example, modulates a light beam emitted from the light source device in accordance with image information, and enlarges and projects the modulated light beam modulated by the modulation device on the projection surface. The projection light source device can be used as a projection type display device having a projection unit and a uniform illumination optical system arranged on an optical path between the light source device and the modulation unit. As described above, according to the projection display device including the light source device of the present invention, a projection lens having a small F-number and a large aperture is unnecessary, so that the cost of the device can be reduced. Further, even when a liquid crystal light valve having a viewing angle dependency is used as the modulation means, it is hardly affected by the viewing angle characteristics, so that a high-quality image without display unevenness can be projected on the projection surface.

  A modulation unit that modulates the light beam emitted from the light source device according to image information; and a projection unit that enlarges and projects the modulated light beam modulated by the modulation unit on the projection surface, The projection display device in which a third uniform optical element is arranged on the optical path between the light source device and the modulation means is used as the light source device, and the first and second light source lamps have first and second front openings. If a light source device having a configuration in which two uniform illumination optical elements are arranged is used, in addition to the above-described effects, the projection display apparatus can be reduced in size.

[Embodiment 1]
(Light source device)
A light source device that provides the present invention will be described below with reference to the drawings. FIG. 1A shows a schematic configuration of a light source device to which the present invention is applied. FIG. 1B shows a plan view of the light source device as viewed from the illumination light emitting side, and FIG. 1C shows a cross-sectional shape of the illumination light obtained from the light source device. . Note that FIG. 1A also shows a uniform illumination optical system that includes an integrator lens that is a uniform illumination optical element as an irradiated portion of illumination light obtained from the light source device.

  As shown in FIG. 1A, the light source device 2 includes a first light source lamp 20A and a second light source lamp 20B that can emit a light beam including three primary color components, and the light source lamps 20A and 20B. A lamp housing 23 that is housed, and a light guide 24 that emits in the same direction in the form of a light beam that connects the first light beam W1 and the second light beam W2 emitted from each of the light source lamps 20A and 20B. Yes. A uniform illumination optical system 3 is located on the emission side of the light source device 2.

  The lamp housing 23 is divided into two lamp assembly chambers 231A and 231B having an opening at the front, and the light source lamps 20A and 20B are disposed therein. These two light source lamps 20A and 20B are arranged apart so that their optical axes 1a and 1b are parallel to each other.

  Each of the light source lamps 20A and 20B includes lamp main bodies 21A and 21B and lamp reflectors 22A and 22B to which the lamp main bodies 21A and 21B are attached. The lamp main bodies 21A and 21B are preferably metal halide lamps having excellent luminous efficiency, long life, and excellent color rendering properties. Of course, xenon lamps and halogen lamps may be used. is there.

  Each of the lamp reflectors 22A and 22B has circular openings 222A and 222B at the front, and reflection surfaces 221A and 221B having a parabolic cross section extend rearward from the openings 222A and 222B. The lamp bodies 21A and 21B are fixed to the center of the bottom of the reflecting surfaces 221A and 221B with a heat-resistant adhesive or the like. The lamp bodies 21A and 21B are attached to the lamp reflectors 22A and 22B so that the tube axes coincide with the central axes of the reflecting surfaces 221A and 221B.

  The light guide 24 includes first and second light beams W1 emitted in a state of being separated from the front openings 222A and 222B of the lamp reflectors 22A and 22B of the light source lamps 20A and 20B arranged at positions separated from each other. It is formed such that it receives W2 and can emit in the same direction in the state of the light beam W that connects these light beams W1 and W2. In the light source device 2 of this example, the light guide unit 24 is configured by arranging four reflectors 241, 242, 243, and 244 having the same shape at predetermined positions.

  As shown in FIGS. 1 (A) and 1 (B), the light guide section 24 includes first and second reflectors arranged so as to cover a part of the front openings 222A and 22B of the lamp reflectors 22A and 22B. 241 and 242 and third and fourth reflectors 243 and 244 arranged so as to cover the space between the lamp reflectors 22A and 22B.

  The first and second reflectors 241 and 242 have the optical axis 1a (1b) in a state in which the reflecting surfaces face the lamp bodies 21A and 21B from both ends in the arrangement direction of the front openings 222A and 222B of the lamp reflectors 22A and 22B. ) In a state extending in a direction inclined by 45 degrees with respect to.

  The third and fourth reflectors 243 and 244 are arranged from the end opposite to the end where the first and second reflectors 241 and 242 are arranged in the front openings 222A and 222B of the lamp reflectors 22A and 22B, respectively. The reflecting surface is disposed in a state extending in a direction inclined by 45 degrees with respect to the optical axis 1a (1b) with the reflecting surface facing away from the lamp bodies 21A and 21B.

  In the light source device 2 configured as described above, the first light beam W1 including the color components of the three primary colors and the second light beam W2 are emitted from the light source lamps 20A and 20B in a separated state. Among these light fluxes W1 and W2, a part W1a of the first light flux W1 is reflected at a right angle toward the inside by the first reflecting plate 241, and then reflected again at a right angle by the third reflecting plate 243. Then, the light is emitted to the uniform illumination optical system 3 side. The remaining partial light beam W1b of the first light beam W1 is emitted as it is to the uniform illumination optical system 3 side without being influenced by the light guide 24. On the other hand, a part of the second light flux W2 is reflected at a right angle toward the inside by the second reflector 242 and then reflected again at a right angle by the fourth reflector 244, so that the uniform illumination optical system. 3 is emitted.

  Here, since the space between the lamp reflectors 22A and 22B is covered by the third and fourth reflectors 243 and 244, the light flux components W1a and W2a reflected by these reflectors 243 and 244 are the first And it is radiate | emitted toward the uniform illumination optical system 3 as a light beam which connects between the 2nd light beams W1 and W2. As a result, the uniform illumination optical system 3 is irradiated with mutually connected illumination light W as shown in FIG.

  As described above, in the light source device 2 of this example, the outer portions of the light beams W1 and W2 emitted from the first and second light source lamps 20A and 20B are separated from the light beams W1 and W2 and separated. The luminous flux components W1a and W2a are emitted from between the light source lamps 20A and 20B, so that the luminous fluxes W1 and W2 are connected to each other and then emitted toward the uniform illumination optical system (irradiated region) 3. . Therefore, even if there is a space between the first and second light source lamps 20A and 20B, the width Wt of the irradiated region can be reduced. Therefore, if the light source device 2 of this example is used in a projection display device, it is not necessary to use a large-aperture projection lens with a small F number in order to obtain a bright projection image while preventing a decrease in light utilization efficiency. Therefore, the projection display device can be configured at a low cost. Further, since the width Wt of the irradiated region is narrow, it is possible to reduce the light collection angle of the light incident on the light valve. Therefore, even when a liquid crystal light valve having a viewing angle dependency is used as a light valve, a projection display device that can obtain a high-quality image without display unevenness without being greatly affected by the viewing angle characteristic. Can be configured.

(Projection display)
An example of a projection display device including the light source device 2 having the above configuration will be described. This projection display device separates the white light beam from the light source device 2 into three color light beams of red, green, and blue, and modulates each color light beam according to image information through a light valve composed of a liquid crystal panel. Then, the modulated light fluxes of the respective colors after modulation are recombined and enlarged and displayed on a screen via a projection lens.

  FIG. 2 shows an optical system of the projection display apparatus of this example. As shown in this figure, a projection display device 1 includes a light source device 2 to which the present invention is applied, a uniform illumination optical system 3 including integrator lenses 31 and 32 and a condenser lens 33 that are uniform illumination optical elements. It has. The white light beam W emitted from the uniform illumination optical system 3 is separated into red, green, and blue color light beams R, G, and B, and three light valves as light valves that modulate the color light beams. Liquid crystal light valves 5R, 5G, and 5B, a prism unit 6 as a color synthesis optical system that re-synthesizes the modulated color light beam, and a projection lens unit 7 that enlarges and projects the synthesized light beam on the surface of the screen 10 are provided. Yes. Furthermore, a light guide system 8 is provided that guides the liquid crystal light valve 5B corresponding to the blue light beam B out of the color light beams separated by the color separation optical system 4.

  The uniform illumination optical system 3 includes a reflection mirror 34, and the central optical axis of illumination light from the light source device 2 is bent at a right angle. The integrator lenses 31 and 32 are arranged so as to be orthogonal to each other with the reflection mirror 34 interposed therebetween. A condenser lens 33 is disposed on the exit surface side of the integrator lens 32.

  The illumination light W from the light source device 2 is projected as a secondary light source image on the entrance surface of each lens constituting the integrator lens 32 via the integrator lens 31, and the emitted light from the integrator lens 32 is used. Thus, the object to be irradiated is irradiated.

  The color separation optical system 4 includes a blue-green reflecting dichroic mirror 41, a green reflecting dichroic mirror 42, and a reflecting mirror 43. First, the white light beam W is reflected by the blue-green reflecting dichroic mirror 41 so that the blue light beam B and the green light beam G included in the blue-green reflecting dichroic mirror 41 are orthogonally directed toward the green reflecting dichroic mirror 42.

  The red light beam R passes through the blue-green reflecting dichroic mirror 41, is reflected at a right angle by the rear reflecting mirror 43, and is emitted from the emitting unit 44 of the red light beam R toward the prism unit 6. The blue and green light beams B and G reflected by the mirror 41 are only reflected by the green reflecting dichroic mirror 42 and emitted from the light emitting unit 45 of the green light beam G toward the color synthesis optical system. . The blue light beam B that has passed through the mirror 42 is emitted from the emitting portion 46 of the blue light beam B to the light guide system 8 side. In this example, the distances from the emitting part of the white light beam W of the uniform illumination optical element to the emitting parts 44, 45, and 46 of each color light beam in the color separation optical system 4 are all set to be equal.

  Condensing lenses 51 and 52 are arranged on the emission side of the emission portions 44 and 45 of the red and green light beams R and G of the color separation optical system 4, respectively. Therefore, the red and green light beams R and G emitted from the respective emission portions are incident on these condenser lenses 51 and 52 and are collimated.

  The collimated red and green light beams R and G are incident on the liquid crystal light valves 5R and 5G and modulated, and image information corresponding to each color light is added. That is, these light valves are switching-controlled in accordance with image information by a driving means (not shown), thereby modulating each color light beam passing therethrough. As such driving means, known means can be used as they are. On the other hand, the blue light beam B is guided to the corresponding liquid crystal light valve 5B through the light guide system 8, and is similarly modulated according to the image information. In the light valve of this example, for example, a polysilicon TFT can be used as a switching element.

  The light guide system 8 includes a condenser lens 54 arranged on the emission side of the emission part 46 of the blue light beam B, an incident-side reflection mirror 81, an emission-side reflection mirror 82, and an intermediate lens 83 arranged between these reflection mirrors. And a condensing lens 53 arranged on the front side of the liquid crystal panel 5B. The optical path length of each color light beam, that is, the distance from the light source device 2 to each liquid crystal panel, is the longest in the blue light beam B, and therefore the light amount loss of this light beam is the largest. However, the light quantity loss can be suppressed by interposing the light guide system 8.

  Next, each color beam modulated through the liquid crystal panels 5R, 5G, 5B is incident on the color synthesis optical system 6 where it is recombined. In this example, the color synthesizing optical system is configured by using a prism unit 6 composed of a dichroic prism. Here, the recombined color image is enlarged and projected onto the surface of the screen 10 at a predetermined position via the projection lens unit 7.

  The projection display device 1 of this example configured as described above includes a light source device 2 to which the present invention is applied as its light source. Since the light source device 2 includes two light source lamps 20A and 20B, even if one of the light source lamps does not turn on due to a lifetime or the like, the illumination light is obtained from the other light source lamp and an image is displayed on the screen. can do. For this reason, according to the projection display apparatus 1 provided with the light source device 2, it is possible to avoid the disadvantage that the user is uncomfortable or the projection has to be temporarily interrupted in order to replace the light source device.

  Further, the light source device 2 has the liquid crystal light valves 5R, 5G, and 5B via the uniform illumination optical system 3 even when both the light source lamps 20A and 20B are lit or only one of the light source lamps is lit. Uniform illumination. Therefore, according to the projection display device including the light source device 2, a high-quality image free from color unevenness and illuminance unevenness can be enlarged and displayed.

  Furthermore, since the light source device 2 has a narrow width Wt of the irradiated area of the illumination light W obtained therefrom, the projection display device 1 provided with the light source device 2 prevents the light use efficiency from being lowered. In order to obtain a bright projection image, it is not necessary to use a large-diameter projection lens having a small F number. Therefore, an inexpensive projection display device can be realized. In addition, since the width Wt of the irradiated region is narrow, the condensing angle of the light incident on the liquid crystal light valves 5R, 5G, and 5B is small and is hardly affected by the viewing angle characteristics of the liquid crystal light valves 5R, 5G, and 5B. For this reason, even when a liquid crystal light valve having a visual field dependency is used as the light valve, it is possible to eliminate a situation where display unevenness or the like occurs in the image projected on the screen 10.

[Embodiment 2]
FIG. 3 shows a light source device according to the second embodiment. The light source device 2A shown in this figure is the same as the light source device 2 of Embodiment 1 except for the configuration of the light guide. For this reason, the same code | symbol is attached | subjected to a corresponding part and those description is abbreviate | omitted.

  As shown in FIGS. 3A and 3B, the light guide unit 24A in the light source device 2A separates a part of the second light flux W2 from the light flux W2, and thereby the first and second light fluxes W1 and W2. It is formed so as to be emitted as a light beam connecting the two. The light guide 24A is configured by arranging two reflectors 245 and 246 having the same shape at predetermined positions.

  The light guide 24A is guided to a reflecting plate 245 that reflects and separates a part W2a of the second light beam W2 in a direction different from the light beam W2, and a light beam component W2a separated by the reflecting plate 245, and this light beam component W2a. Is provided as a light beam connecting the first and second light beams W1 and W2 in the direction of the optical axis 1a (1b).

  The reflector 245 is arranged in a state extending from the outer end of the front opening 222B of the lamp reflector 22B in a direction inclined by 45 degrees with respect to the optical axis 1a (1b) with the reflecting surface facing the lamp body 21B. ing. The reflection plate 245 covers about half of the front opening 22B of the lamp reflector 22B as shown in FIG. 3B when the light source device 2 is viewed from the emission side.

  The reflecting plate 246 is arranged in a state extending from the inner end of the front opening 222B of the lamp reflector 22B in a direction inclined by 45 degrees with respect to the optical axis 1a (1b) with the reflecting surface facing the lamp body 21B. ing. When the light source device 2 is viewed from the emission side, the reflecting plate 246 covers the space between the lamp reflectors 22A and 22B as shown in FIG.

  In the light source device 2A of this example, of the first and second light fluxes W1 and W2 from the light source lamps 20A and 20B, the first light flux W1 is not regulated by the reflectors 245 and 246 at all and is uniform illumination optics as it is. The light is emitted to the system 3 side. On the other hand, the light flux component W2a, which is about half of the second light flux W2, is bent at a right angle by the reflecting plate 245, and then is bent again at a right angle by the reflecting plate 246 and then emitted toward the uniform illumination optical system 3. .

  In the light source device 2A of the present example, the space between the lamp reflectors 22A and 22B is covered by the reflector 246. Therefore, the light beam component W2a reflected by the reflecting plate 246 enters the uniform illumination optical system 3 from the light beam connecting the first and second light beams W1 and W2, that is, the wasted space between the light source lamps 20A and 20B. It will be emitted toward. Therefore, as shown in FIG. 3C, even in the light source device 2A of this example, even if there is a space between the light source lamps 20A and 20B, the irradiated area of the illumination light W obtained from the light source device 2A The width Wt can be reduced. For this reason, the effect similar to the light source device 2 of Embodiment 1 can be acquired. In addition to this, in the light source device 2A of the present example, the light guide unit 24A is constituted by the two reflection plates 245 and 246, so that the cost of the light source device can be reduced.

[Embodiment 3]
FIG. 4 shows a light source device according to the third embodiment. The light source device 2B shown in this figure is the same as the light source device 2 of the first embodiment except for the configuration of the light guide. For this reason, the same code | symbol is attached | subjected to a corresponding part and those description is abbreviate | omitted.

  As shown in FIGS. 4A and 4B, the light guide unit 24B in the light source device 2B separates the second light beam W2 into first and second light beam components W2a and W2b, and these first and first light beams The two light beam components W2a and W2b are configured to be emitted as light beams connected at positions symmetrical with respect to the first light beam W1.

  The light guide unit 24B is guided with a reflection plate 247 that reflects and separates a part of the second light beam W2 in a direction different from the direction of the optical axis 1b, and a light beam component W2a separated by the reflection plate 247. A reflecting plate 248 that reflects the component W2a as a light beam connected to one end of the first light beam W1 in the direction of the optical axis 1a (1b) and the remaining light beam component W2b of the second light beam W2 are guided, and this light beam A reflection plate 249 is provided that reflects the component W2b as a light beam connected to the other end of the first light beam W1 in the direction of the optical axis 1a (1b).

  The reflector 247 is disposed away from the outer end of the front opening 222B of the lamp reflector 22B. The reflecting plate 247 is arranged in a state extending in a direction inclined by 45 degrees with respect to the optical axis 1a (1b) with the reflecting surface facing the lamp body 21B. About half of the front opening 222B of the lamp reflector 22B is covered by the reflecting plate 247.

  The reflector 248 is arranged in a state extending from the center of the front opening 222B of the lamp reflector 22B in a direction inclined by 45 degrees with respect to the optical axis 1a (1b). Further, the reflector 248 is disposed in a state of covering the remaining portion of the front opening 222B of the lamp reflector 22B that is not covered by the reflector 247 and the lamp reflectors 22A and 22B. Both the front and back surfaces of the reflecting plate 248 constitute reflecting surfaces.

  The reflector 249 extends from the outer end of the front opening 222A of the lamp reflector 22A in a direction inclined by 45 degrees with respect to the optical axis 1a (1b) with the reflecting surface facing away from the lamp body 21A. Arranged in a state.

  In the light source device 2B of the present example, of the first and second light fluxes W1 and W2 from the light source lamps 20A and 20B, the first light flux W1 is not restricted by the reflectors 247, 248, and 249 and remains as it is. The light is emitted toward the uniform illumination optical system 3. On the other hand, in the second light flux W2, about half of the light flux component W2a is bent at a right angle toward the inside by the reflector 247, and the remaining light flux component W2b is the surface of the reflector 248 (the surface facing the lamp body 21b). Therefore, it is reflected at a right angle toward the inside. The light beam component W2a reflected by the reflecting plate 247 is reflected again at a right angle by the back surface of the reflecting plate 248 (the surface opposite to the surface facing the lamp main body 21b) and emitted toward the uniform illumination optical system 3. The In this case, since the space between the first and second light fluxes W1 and W2 is covered by the reflecting plate 248, the light flux component W2a is connected to the first light flux W1 on the right side in the drawing, so that the uniform illumination optics can be used. The light is emitted to the system 3 side. On the other hand, the light beam component W2b reflected by the surface of the reflecting plate 248 crosses the first light beam W1, is bent at a right angle by the reflecting plate 249, and is emitted toward the uniform illumination optical system 3. In this case, since the reflection plate 249 is attached to the end of the opening 222A of the lamp reflector 22A, the light flux component W2b is connected to the first light flux W1 on the left side in the drawing, and the uniform illumination optical system 3 side. Will be emitted. Therefore, as shown in FIG. 4C, also in the light source device 2B of this example, the width Wt of the irradiated region can be narrowed even if there is a space between the light source lamps 20A and 20B. Thereby, the effect similar to the light source device 2 of Embodiment 1 can be acquired.

  In addition to this, the light source device 2B of the present example can obtain the following effects. That is, in the light source device 2B of the present example, the second light flux W2 is divided in half, and the separated light flux components W2a and W2b are respectively connected at positions symmetrical with respect to the first light flux W1. Even if the light source lamp is not turned on, the illumination light W that is symmetrical with respect to the central portion of the irradiated portion can be obtained. Therefore, when the light source device 2B of this example is used as a light source of a projection display device having a uniform illumination optical system, even if one of the light source lamps does not light up, the light that illuminates the liquid crystal light valve is uneven. This has the advantage that it is less likely to occur and unevenness is less likely to occur in the projected image on the screen.

[Embodiment 4]
FIG. 5 shows a light source device according to the fourth embodiment. Since the light source device 2A shown in this figure is substantially the same as the light source device 2 of the first embodiment, the corresponding parts are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 5A, in the light source device 2C, the first light source lamp 20A and the second light source lamp 20B are arranged such that the optical axes 1a and 1b are orthogonal to each other. Further, in the light source device 2C of the present example, the light guide unit 24C is configured to emit the second light beam W2 while being connected to the first light beam W1 in a state of surrounding the first light beam W1. The light guide unit 24C includes a light guide element 25 that converts the second light flux W2 into a light flux W2 ′ having a circular cross section perpendicular to the optical axis 1b, and an annular formed by the light guide element 25. A reflecting plate 26 is provided that guides the shaped light beam W2 ′ in the direction of the optical axis 1a of the first light beam W1 so as to surround the first light beam W1.

  The light guide element 25 includes a cylindrical portion 252 extending from the entire edge of the front opening 222B of the lamp reflector 22B toward the optical axis 1b. As shown in FIG. 5B, the cylindrical portion 252 has a wide angle in the direction of the optical axis 1b, and the angle is set at an angle of approximately 45 degrees with respect to the optical axis 1b. The inner peripheral surface of the cylindrical portion 252 is made a reflective surface by aluminum vapor deposition or the like, and a conical reflective portion 251 having an outer wall made a reflective surface by aluminum vapor deposition or the like is provided inside the cylindrical portion 252. ing. Therefore, the second light beam W2 from the second light source lamp 20B is forcibly shaped and emitted by the cylindrical portion 252 and the reflecting portion 251 into a light beam W2 'having an annular cross section.

  The reflector 26 is disposed in front of the first light source lamp 20A so as to extend in a direction inclined by 45 degrees with respect to the optical axis 1a with the reflecting surface 262 facing away from the lamp body 21A. Yes. As shown in detail in FIG. 5C, the reflection plate 26 has a flat plate shape, and a transmission portion 261 through which the first light flux W1 is transmitted is formed at the center thereof. The transmission part 261 is formed of a transparent material that can transmit light, such as a through hole or glass.

  In such a light source device 2C, the first light beam W1 from the first light source lamp 20A passes through the transmission part 261 of the reflection plate 26 as it is and is irradiated to the integrator lens. On the other hand, the second light beam W2 from the second light source lamp 20A is shaped into a light beam W2 ′ having a circular cross section by the light guide element 25, and then reflected at a right angle by the reflecting plate 26 to the integrator lens. Irradiated.

  Here, in this example, the light guide element 25 and the reflection plate 26 are positioned so that the annular light beam W <b> 2 ′ emitted from the light guide element 25 circumscribes the transmission part 261 of the reflection plate 26. . Therefore, as shown in FIG. 5D, illumination light W in a state in which the second light beam W2 is concentrically surrounded by the first light beam W1 is emitted from the reflecting plate 26 toward the integrator lens. Will be. Therefore, also in the light source device 2 </ b> C of this example, the width Wt of the illuminated region of the illumination light W can be reduced. Thereby, the effect similar to the light source device 2 of Embodiment 1 can be acquired.

  In addition, in the light source device 2C of the present example, the illumination light W having a substantially circular cross section can be obtained when both the first and second light source lamps 20A and 20B are lit. If 2C is used as the light source of the projection display device, the efficiency of swallowing into the projection lens increases, and a brighter image can be obtained. In addition, even when one of the light source lamps is not turned on, it is possible to obtain emitted light that is symmetric with respect to the central portion of the irradiated portion. Therefore, the light source lamp is used as a light source for a projection display device using a uniform illumination optical system In such a case, the light that illuminates the light valve is less likely to be uneven, and thus has the advantage that unevenness is less likely to occur in the projected image.

[Embodiment 5]
FIG. 6 shows a light source device according to the fifth embodiment. Also in the light source device shown in this figure, the same reference numerals are given to the portions common to the light source device 2 of the first embodiment, and description thereof is omitted.

  As shown in FIG. 6, the light source device 2D of this example includes a first light source lamp 20A and a second light source lamp 20B that are arranged so that the optical axes 1a and 1b are orthogonal to each other, and each lamp reflector 22A. Integrator lenses 35A and 35B arranged close to the openings 222A and 222B of 22B, and a reflector 250 arranged on the light exit surface side of the integrator lens 35A provided on the lamp reflector 22A side. . In addition, an integrator lens 32 disposed so as to be orthogonal to the integrator lens 35 </ b> A with the reflector 250 interposed therebetween, and a condenser lens 33 provided on the light emitting surface side of the integrator lens 36 are provided. , 35A, 35B and the condenser lens 33 constitute a uniform illumination optical system.

  The reflecting plate 250 of this example is arranged in a state extending in a direction inclined by 45 degrees with respect to the optical axis 1a of the first light source lamp 20A with the reflecting surface facing the lamp body 21A. Further, the front end portion of the reflecting plate 250 extends to a position substantially in contact with the second light flux W2. Therefore, the first light beam W1 from the first light source lamp 20A that has passed through the integrator lens 35A is emitted to the integrator lens 32 side in a state of being connected to the second light beam W2 from the second light source lamp 20B. Will be. As a result, as shown in FIG. 6B, also in the light source device 2D of the present example, the width Wt of the irradiated region of the illumination light W can be narrowed even if there is a space between the light source lamps 20A and 20B. Thereby, the effect similar to the light source device 2 of Embodiment 1 is acquired.

  Further, the light source device 2D of the present example includes integrator lenses 35A and 35B arranged immediately after the respective light source lamps 20A and 20B, an integrator lens 32 and a condenser lens 33 arranged on the emission side. . That is, the uniform illumination optical system 3 is configured in the light source device 2D. Therefore, if the light source device 2D is used as the light source of the projection display device, there is no need to separately provide a uniform illumination optical system, so that the projection display device can be reduced in size and cost can be obtained.

(Other embodiments)
In the above-described embodiment, as an example of the projection display device, only the projection display device 1 (FIG. 2) in which the light source device according to Embodiment 1 shown in FIG. 1 is adopted as the projection display device has been described. However, similarly, it is of course possible to apply the light source device according to another embodiment to the projection display device.

  The projection display device 1 is a projection display device provided with a transmissive light valve, but the light source device of the present invention can also be applied to a projection display device provided with a reflection light valve. .

  Further, although the projection display device 1 is a front projection display device that performs projection from the side on which the projection surface is observed, the light source device of the present invention performs rear projection that projects from the opposite direction to the side on which the projection surface is observed. It is also applicable to a type display device.

  As described above, in the light source device of the present invention and the projection display device including the light source device, the separated light fluxes emitted from the plurality of light source lamps are connected to each other by the light guide means, thereby Even if there is a space between the second light source lamps, the width of the irradiated region is made narrow. For this reason, it is not necessary to use a large-aperture projection lens with a small F-number in order to increase the light utilization efficiency and obtain a bright projection image, and the condensing angle of light incident on the light valve can be kept small. . Therefore, it is possible to provide a small and inexpensive projection display device that can project a bright high-quality image without display unevenness.

(A) is a schematic block diagram of the light source device according to Embodiment 1 of the present invention, (B) is a plan view when this light source device is viewed from the emission side, and (C) is obtained from this light source device. It is explanatory drawing which shows the cross-sectional shape of the illumination light produced. It is a schematic block diagram of the optical system of the projection type display apparatus provided with the light source device shown in FIG. 1 as a light source. (A) is a schematic block diagram of the light source device according to Embodiment 2 of the present invention, (B) is a plan view when this light source device is viewed from the emission side, and (C) is obtained from this light source device. It is explanatory drawing which shows the cross-sectional shape of the illumination light produced. (A) is a schematic block diagram of the light source device according to Embodiment 3 of the present invention, (B) is a plan view when this light source device is viewed from the emission side, and (C) is obtained from this light source device. It is explanatory drawing which shows the cross-sectional shape of the illumination light produced. (A) is a schematic block diagram of the light source device which concerns on Embodiment 4 of this invention, (B) is a perspective view which shows a light guide element, (C) is a perspective view which shows a reflecting plate, (D) is It is explanatory drawing which shows the cross-sectional shape of the illumination light obtained from this light source device. (A) is a schematic block diagram of the light source device which concerns on Embodiment 5 of this invention, (B) is explanatory drawing which shows the cross-sectional shape of the illumination light obtained from this light source device. (A) is a schematic block diagram of the light source device provided with the several light source lamp which the present applicant has proposed, (B) is explanatory drawing which shows the cross-sectional shape of the illumination light obtained from this light source device. (A) is explanatory drawing which shows typically the mode of the light irradiated to a projection lens, (B) is explanatory drawing which shows typically the relationship between the divergence angle of light and projection distance. (A) is explanatory drawing which shows typically the light with which a light valve is illuminated when there is no space between two lamps, (B) is a light valve when there is a space between two lamps. It is explanatory drawing which shows typically the light illuminated.

Explanation of symbols

1a, 1b ... Optical axis, 2, 2A, 2B, 2C, 2D, 200 ... Light source device, 20A, 20B ... Light source lamp, 21A, 21B ... Lamp body, 22A, 22B ... Lamp reflectors, 221A, 221B ... reflective surfaces, 222A, 222B ... openings, 23 ... lamp housings, 231A, 231B ... lamp assembly chambers, 24, 24A, 24B, 24C ... light guides , 241, 242, 243, 244 ... reflector, 245, 246 ... reflector, 247, 248, 249 ... reflector, 250 ... reflector, 25 ... light guide element, 251 ... Reflection part, 252 ... Cylindrical part, 26 ... Reflection plate, 261 ... Transmission part, 262 ... Reflection part, 3,300 ... Uniform illumination optical system, 31, 32 ..Integrator lenses, 3 ... Condenser lens, 34 ... Reflective mirror, 35A, 35B ... Integrator lens, 4 ... Color separation optical system, 41 ... Blue-green reflective dichroic mirror, 42 ... Green reflective dichroic mirror , 43... Reflection mirror, 44, 45, 46... Emitting portion, 5R, 5G, 5B... Liquid crystal light valve, 51, 52, 53, 54. Unit: 7 ... projection lens unit, 71 ... projection lens, 8 ... light guide system, 81 ... incident side reflection mirror, 82 ... output side reflection mirror, 10 ... screen.

Claims (4)

A first light source lamp that emits a first light beam; and a second light source lamp that emits a second light beam. The first and second light source lamps each include a lamp body and the lamp. In a light source device configured to include a reflecting mirror that reflects diverging light from the main body and emits the first or second light flux from the front opening,
The first and second light beams emitted in a state of being separated from the front opening of each light source lamp located at a position apart from each other are received, and these light beams are emitted in the same direction in a state of light beams connected to each other. Having light guiding means,
The first and second light source lamps are arranged in a state in which both optical axes intersect each other, and the front openings of the first and second light source lamps are circular,
The light guide means converts the first light beam into a light beam having a circular cross section perpendicular to the optical axis, and an annular light beam formed by the light guide element. A reflection plate for guiding the second light flux in an emitting direction so as to surround the second light flux;
The light guide device emits the first light flux in a state of being surrounded by the second light flux and connected to the second light flux. 2. The light source device according to claim 1, wherein first and second uniform illumination optical elements are respectively disposed in the front openings of the first and second light source lamps. The light source device according to claim 1 , a modulation unit that modulates a light beam emitted from the light source device in accordance with image information, and a modulated light beam modulated by the modulation unit on the projection surface And a projection unit for enlarging and projecting, and a uniform illumination optical system is disposed on an optical path between the light source device and the modulation unit. The light source device according to claim 2, a modulation unit that modulates a light beam emitted from the light source device according to image information, and a modulated light beam that has been modulated by the modulation unit is enlarged on a projection surface A projection display device, comprising: a projection unit for projecting, wherein a third uniform illumination optical element is disposed on an optical path between the light source device and the modulation unit.

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