JP2010073517A - Illuminating device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a technology of making smaller a loss of a light amount and a synthetic part of a light path in a projector equipped with three or more light sources. <P>SOLUTION: By a pyramid shaped reflecting member 80 having the number of pyramid faces matched to the number of lamps, illumination light emitted from the lamps 20, 30, 40, 50 can be reflected in a direction of a light bulb. Moreover, since the illumination light is converged according to sizes of the pyramid faces, the loss of the light amount of the illumination light reflected in the direction of the light bulb is suppressed. Accordingly, even if the number of the lamps is increased, it suffices for suppressing the enlargement of an optical system that the number of the pyramid faces is increased according to the increased number of the lamps without specially enlarging the reflecting member 80. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lighting device and a projector including the lighting device.

  The projector includes a light modulation device, which is also called a light valve, and an illuminating device, and illuminates light having a predetermined wavelength band emitted from the illuminating device when the light is transmitted through the light modulating device, and an image to be displayed. Is an apparatus that displays an image by adjusting to the illuminance according to the above and projecting it onto a screen installed at a predetermined distance.

  In recent years, a projector has been made to brighten a projected image so that the image can be visually recognized even in a bright environment, and various methods have been proposed. As one of them, Patent Document 1 proposes a technique that uses two light sources provided in a lighting device. In this technique, the illumination light from two light sources is collected and reflected so that the illumination light is incident on the light modulation device in a state where they overlap each other, and the brightness of the projected image is increased.

  By the way, in the case where two light sources are used in the illumination device or projector, there is a possibility that the illumination device or projector becomes large in order to combine the optical paths while suppressing the loss of light quantity. In view of this, Patent Document 2 proposes a technique for reducing the loss of light amount and the combined portion of the optical path in a projector using two light sources.

JP-A-6-242397 JP 2002-72083 A

  However, the techniques proposed in Patent Document 1 and Patent Document 2 can be applied to a case where there are two light sources. In a projector using more light sources, the techniques disclosed in Patent Document 1 and Patent Document 2 are used. Is difficult to apply. Therefore, in a projector provided with three or more light sources, it has been a problem to propose a technique for reducing the loss of light amount and the combined portion of the optical path.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 An illumination device that emits illumination light to a light modulation device, comprising: a plurality of light sources; and a reflection member provided with a plurality of reflection surfaces, wherein the plurality of light sources are at least first. To the third light source, the plurality of reflecting surfaces include at least first to third reflecting surfaces, and the first light emitted from the first light source is reflected by the first reflecting surface, The second light emitted from the second light source is reflected by the second reflecting surface, and the third light emitted from the third light source is reflected and reflected by the third reflecting surface. The first to third lights are emitted as the illumination light, and each of the first to third reflecting surfaces is provided so as to form at least a part of a pyramid surface forming a pyramid shape. It is characterized by that.

  According to this configuration, the light emitted from the light source can be reflected in the direction of the light modulation device by the reflection member having the pyramid surface as the reflection surface and having at least the number of pyramid surfaces corresponding to the number of light sources. Therefore, even if the number of light sources increases, the number of pyramidal surfaces may be increased according to the increased number. As a result, even when at least three or more light sources are provided, it is possible to prevent the reflecting member from becoming large and the optical system from becoming large.

  Application Example 2 In the illumination device described above, at least one light source among the plurality of light sources is a collection for irradiating the reflection surface on which the light is reflected by the light emitted from the light source. A light means is provided.

  According to this configuration, since the light emitted from the light source is collected according to the size of the pyramid surface, a light amount loss at the time of reflection of the light reflected in the direction of the light modulation device is suppressed.

  Application Example 3 In the illumination device, at least one of the plurality of light sources includes a light emitting unit and a reflecting mirror, and the light condensing unit provided in the light source includes the light source. It is the said reflective mirror, It is characterized by the above-mentioned.

  According to this configuration, since the light emitted from the light source is collected by the reflecting mirror of the light source, there is no need to provide the light collecting means as a separate member.

  Application Example 4 In the illuminating device, the first light is red light, the second light is green light, and the third light is blue light.

  According to this configuration, the lighting device can include at least three light sources without increasing the optical system. Therefore, color display is facilitated by setting light emitted from each light source to light having a wavelength corresponding to one of red, green, and blue.

  Application Example 5 In the illuminating device, the reflection surface shape of at least one of the plurality of reflection surfaces is different from the reflection surface shape of the other reflection surfaces.

  According to this configuration, the normal direction of the reflecting surface can be adjusted by changing the shape of the reflecting surface. Therefore, it is possible to adjust the direction of the reflecting surface according to the arrangement position of the light source. Or the area of a reflective surface can be enlarged by making the shape of a reflective surface different. Therefore, by increasing the reflection surface according to the amount of light emitted from the light source, it is possible to suppress a light amount loss during reflection of the light emitted from the light source.

  Application Example 6 A projector including a light modulation device that modulates illumination light, and the illumination device that irradiates the illumination light to the light modulation device.

  According to this projector, it is possible to realize a projector that suppresses an increase in the optical system even if a plurality of light sources are provided.

  Hereinafter, the present invention will be described based on examples. FIG. 1 is an explanatory diagram for explaining an outline of the configuration of an illuminating device 100 according to an embodiment embodying the present invention and a projector 10 provided with the illuminating device 100. In the following, the drawings used in the description of the present embodiment exaggerate the length and size as necessary, and may differ from the actual length and size.

  The projector 10 includes a light valve 15 as a light modulation device that forms an image to be projected on a screen 18, and an illumination device 100 that irradiates the light valve 15 with illumination light. The illumination light emitted from the illuminating device 100 is focused by the lens 11 and the lens 12 onto a light beam that irradiates the image display area of the light valve 15, and then light-modulated according to the display image when passing through the light valve 15. Is done. The light-modulated illumination light is projected as a projection image on the screen 18 by the projection lens 16.

  Here, in the projector 10, when the illumination light emitted from the illumination device 100 has a circular light beam and the image display area of the light valve 15 has a rectangular shape, in the optical path from the lens 11 to the light valve 15. It is possible to adopt a well-known configuration that converts circular light into rectangular light through an integrator lens (fly eye lens) (not shown).

  Further, the projector 10 splits the illumination light from the illumination device 100 into light having a predetermined wavelength, modulates each spectral light by the plurality of light valves 15, and then collects each light-modulated spectrum. It is also possible to employ a configuration for projecting. For example, although not shown, the illumination light is split into R (red) light, G (green) light, and B (blue) light by a dichroic mirror or the like, and the divided R light, G light, and B light are three light valves. 15 may be used for light modulation, and then condensed by a cross prism or the like. Therefore, the optical configuration shown in FIG. 1 in the present embodiment shows a principle configuration until the projection image is projected onto the screen 18 with respect to the illumination light emitted from the illumination device 100.

  Next, the illumination device 100 will be described. In this embodiment, for convenience of the following description, in FIG. 1, the horizontal direction in the drawing is the X direction (the right direction is the positive direction), and the direction crossing the X direction, that is, the front and back direction of the drawing is the Y direction (the front side is the positive direction). ). In addition, the vertical direction of the drawing is the Z direction (the upper side is the plus direction). Therefore, the XY plane formed by the X direction and the Y direction is a plane substantially parallel to the lens 11, and the Z plus direction is a direction perpendicular to the XY plane and is an irradiation direction of illumination light to the light valve 15.

  In this embodiment, the illumination device 100 includes lamps 20, 30, 40, and 50 as four light sources that emit light, a reflecting member 80, and a lens 90 that functions as a collimator lens for light reflected by the reflecting member 80. have. The lamp 20 and the lamp 40 are arranged to face each other so that the light emission direction is substantially opposite to each other in the X direction. Further, the lamp 30 and the lamp 50 are disposed to face each other so that the light emission direction is substantially opposite to each other in the Y direction.

  In this embodiment, the reflecting member 80 is formed by applying a light reflecting material such as aluminum by vapor deposition or the like to four pyramid surfaces of glass having a regular quadrangular pyramid shape. Of course, in addition to glass, a metal material or a ceramic material may be used. Moreover, it is good also as a regular quadrangular pyramid which comprised each pyramid surface with the reflecting plate which apply | coated light reflection materials, such as aluminum, to a glass plate by vapor deposition etc., and formed the reflecting layer.

  As the lamps 20, 30, 40, 50, a high-pressure mercury lamp, a xenon lamp, a metal halide lamp, an LED lamp, or the like can be adopted, and the light emitted from the light emitting unit is emitted by being reflected by a reflecting mirror. Therefore, each lamp 20, 30, 40, 50 emits a light beam having a predetermined irradiation area range according to the shape of a reflecting mirror or the like. In this embodiment, the irradiation area range is assumed to be circular. Of course, it may be other than circular (for example, rectangular).

  The luminous fluxes emitted from the lamps 20, 30, 40, and 50 are collected by a condenser lens as a condenser, and irradiate the reflecting member 80 having a regular quadrangular pyramid shape. For example, as indicated by the shaded portion in FIG. 1, the light beam emitted from the lamp 20 is collected by the condenser lens 21 and then irradiates a reflecting surface forming a pyramid surface of a regular quadrangular pyramid. On the other hand, the light beam emitted from the lamp 40 disposed opposite to the lamp 20 is collected by the condenser lens 41 and then irradiates a reflecting surface forming a pyramid surface of a regular quadrangular pyramid.

  Similarly, the luminous flux emitted from the lamp 30 and the illumination light emitted from the lamp 50 disposed opposite to the lamp 30 are condensed by a condenser lens (not shown), and then a regular quadrangular pyramid. The reflecting surface forming the pyramid surface is irradiated.

  Thereafter, the light irradiated on each reflecting surface is reflected in the direction of irradiating the light modulation device on each reflecting surface, that is, in the direction of the lens 90. The lens 90 converts the reflected light into parallel light, emits it as illumination light, and irradiates the lens 11 of the projector 10. Thus, since the light emitted from each lamp 20, 30, 40, 50 becomes the illumination light emitted from the illumination device 100, the light emitted from each lamp 20, 30, 40, 50 is hereinafter referred to as illumination light. It will also be called.

  The state of reflection of each illumination light emitted from each lamp 20, 30, 40, 50 will be supplementarily described with reference to FIG. FIG. 2 is a perspective view showing the arrangement of the lamps 20, 30, 40, 50, the condenser lenses 21, 31, 41, 51 and the reflecting member 80. In FIG. 2, in order to simplify the drawing, the luminous flux is substituted and displayed by a single straight line corresponding to the optical axis.

  As shown in the figure, the lamp 20 and the lamp 40 are arranged offset with respect to each other in the X direction. In this embodiment, the lamp 40 is located on the plus side in the X direction. The lamp 20 emits a light beam 25 in the X-plus direction, and the lamp 40 emits a light beam 45 in the X-minus direction opposite to the light beam 25. Further, the lamp 30 and the lamp 50 are arranged offset with respect to each other in the Y direction. In this embodiment, the lamp 50 is positioned on the plus side in the Y direction. The lamp 30 emits a light beam 35 in the Y plus direction, and the lamp 50 emits a light beam 55 in the Y minus direction that is opposite to the light beam 35.

  The light beam 25 emitted from the lamp 20 is collected by the condenser lens 21 and irradiated onto one reflecting surface of the reflecting member 80 as shown by a one-dot chain line in the drawing. In other words, the condensing lens 21 condenses so that the irradiation range of the light beam 25 that irradiates the reflecting surface is within the reflecting surface.

  Thereafter, the collected light beam 25 is reflected in the direction of the lens 90, that is, in the Z plus direction, by a reflecting surface, that is, one pyramid surface of a regular quadrangular pyramid, as illustrated. In other words, the angle of one pyramid surface of the regular quadrangular pyramid (for example, the inclination angle with respect to the bottom surface) is set so that the irradiated light beam 25 is reflected in the Z direction. Incidentally, in this embodiment, the bottom surface of the regular pyramid is parallel to the XY plane, and the inclination angle (acute angle portion) of each pyramid surface is set to 45 degrees with respect to the bottom surface.

  The light beams 35, 45, 55 emitted from the other lamps 30, 40, 50 are also reflected by the reflecting member 80 in the same manner as the light beam 25. Therefore, the description is omitted here. Thus, all the light beams 25, 35, 45, and 55 irradiated on the reflecting member 80 are reflected in the same Z plus direction and enter the lens 90.

  The manner in which the light beams 25, 35, 45, and 55 are incident on the lens 90 will be described with reference to FIG. FIG. 3 is a schematic diagram illustrating a state in which the illumination device 100 is viewed from the Z plus direction. 3A shows the reflection positions of the light beams 25, 35, 45, 55 emitted from the lamps 20, 30, 40, 50 on the reflecting member 80, and FIG. In this case, the light beam 25, 35, 45, 55 indicates a region range in which the lens 90 is irradiated.

  In the present embodiment, it is preferable to set the reflection range of each light beam as close as possible to the apex 88 of the pyramid of the reflecting member 80 shown in FIG. . For this reason, it is preferable to set the irradiation range of each light beam that irradiates the reflecting surface to be as small as possible.

  In this way, when the light beams 25, 35, 45, 55 emitted from the lamps 20, 30, 40, 50 enter the lens 90, they overlap each other as indicated by the shaded portion in FIG. The area can be increased. Therefore, the illumination light emitted from the four lamps 20, 30, 40, 50 is converted into parallel light having a large amount of light flux overlapped by the lens 90 and emitted from the illumination device 100. As a result, most of the light beams 25, 35, 45, and 55 irradiate the light valve 15, so that the light quantity loss of the illumination light is suppressed.

  In addition, when the irradiation range of each light beam which irradiates a reflective surface is made small, it is assumed that the heat concentration that the local temperature rise of the reflective surface by irradiation light becomes large arises. Therefore, the size of the irradiation range of each light beam that irradiates the reflecting surface is preferably set as small as possible within a range in which the reflecting member 80 is not thermally deformed. Moreover, you may make it form the reflection member 80 with the material which has heat resistance.

  As described above with reference to FIGS. 1 to 3, according to the projector 10 including the illumination device 100 according to the present embodiment, the pyramid-shaped reflecting member 80 having the number of pyramid surfaces corresponding to the number of lamps is used. The illumination light emitted from the lamp can be reflected in the direction of the light modulation device. Further, since the illumination light is condensed according to the size of the pyramid surface, the light amount loss of the illumination light reflected in the direction of the light modulation device is suppressed. Therefore, even if the number of lamps is increased, the reflecting member 80 may be a pyramid shape having a larger number of pyramidal surfaces according to the increased number of lamps, so that the reflecting member 80 is not particularly large. An increase in the optical system is suppressed.

  The embodiments of the present invention have been described using the embodiments. However, the present invention is not limited to these embodiments, and can be implemented in various forms without departing from the spirit of the present invention. Of course. Hereinafter, a modification will be described.

(First modification)
In the above embodiment, the luminous fluxes of the lamps 20, 30, 40, 50 are condensed using the condensing lenses 21, 31, 41, 51 as the condensing means, respectively, and irradiated to the reflecting surface of the reflecting member 80. Of course, the present invention is not limited to this. For example, the light collecting means may be a reflecting mirror provided in the lamp. By doing so, it is possible to reduce optical components (condensing lenses).

  This modification will be described with reference to FIG. FIG. 4 is a perspective view showing a case where a lamp 401 is used instead of the lamp 40 and the condenser lens 41 included in the illumination device 100 of the above embodiment as an example. Here, only the lamp 40 will be described, but the same applies to the other lamps 20, 30, 50 included in the illumination device 100 of the above embodiment.

  As shown in the figure, in the lamp 401, the shape of the light reflecting surface 401R that is the inner surface of the reflecting mirror 401H is an ellipse (rotary ellipse), and the light emitting portion 401L of the lamp 401 is positioned at one focus (first focus). It is formed to do. And it arrange | positions so that the other focus (2nd focus) may be located on the reflective surface 84 of the reflection member 80. FIG. Therefore, in the present modification, the illumination light emitted from the lamp 401 is condensed on the reflection surface 84 without using a condensing lens, and is reflected on the reflection surface, and then emitted in the Z direction.

  In the present modification, the illumination light emitted from the lamp is reflected by the reflecting member 80 in the same manner as in the above-described embodiment by using the lamp having the reflecting mirror having the elliptical (rotating ellipse) shape as the light reflecting surface. The light beams 25, 35, 45, and 55 can be incident on the lens 90 by focusing on each reflecting surface.

  In the present modification, for example, when the light emitting unit 401L of the lamp 401 is not a point light source but a surface light source, the light beam condensed at the second focal position also has a surface region according to the light emitting unit 401L. Therefore, in practice, in consideration of this surface area, for example, it is preferable to arrange the lamp 401 with respect to the reflecting member 80 (reflecting surface 84) so that the light beam 45 appropriately enters the lens 90. .

(Second modification)
In the above embodiment, four lamps are used. However, the present invention is not limited to this. Even when three lamps or more than four lamps are used, the reflecting member is similarly used according to the number of lamps. What is necessary is just to make it a pyramid shape which has a pyramid surface. As a result, it is possible to prevent the reflecting member from becoming large and the optical system from becoming large.

  As an example of this modification, the case of using three lamps will be described with reference to FIG. FIG. 5 is a schematic diagram showing three lamps 20, 30, 40 and a reflecting member 70 having a regular triangular pyramid shape composed of three reflecting surfaces 72, 73, 74 corresponding to the number of lamps. The state seen from the direction is shown. Each of the reflecting surfaces 72, 73, 74 forms an inclination angle of 45 degrees with respect to the bottom surface of the reflecting member 70, and is in the direction perpendicular to the pyramid surface, that is, the reflecting surface, and the optical axis of the illumination light emitted from the lamp is the XY plane. Are arranged in parallel with each other. Accordingly, the optical axes of the illumination lights of the lamps 20, 30, and 40 are arranged at positions that form an angle of 120 degrees. By arranging the lamp in this way, the position of the center of gravity of the lamp is arranged in a well-balanced manner with the reflecting member 70 as the center, and it can be expected that the weight balance in the lighting device 100 or the projector 10 is suppressed from being biased. .

  When three lamps are used in this way, the lamp 20 emits light having a wavelength light corresponding to R light, the lamp 30 emits light having a wavelength light corresponding to G light, and the lamp 40. May be a lamp that emits light having a wavelength corresponding to B light. In this way, the light beam 25 becomes R light, the light beam 35 becomes G light, and the light beam 45 becomes B light. Since these light beams are superimposed on the lens 90, color display can be easily performed. In addition, since the lamps for R light, G light, and B light are independent from each other, the light amounts of R light, G light, and B light can be individually adjusted, so that white balance in color display can be easily adjusted. It is also possible to do.

(Third Modification)
In the said Example, although the reflecting member was demonstrated as the pyramid shape which has a reflective surface according to the number of lamps, it is good not only as this but the number of reflective surfaces more than the number of lamps. For example, when there are three lamps, as shown in FIG. 6A, the reflecting member may be a reflecting member 80 having a regular quadrangular pyramid shape having four reflecting surfaces used in the above-described embodiment. Of course, it may be a pyramid shape having four or more reflecting surfaces.

  FIG. 6A is a schematic diagram showing an example in which the reflecting member 80 in the above-described embodiment is used for the three lamps 20, 30, 40, and shows a state in which they are viewed from the Z plus direction. . As shown in the drawing, the optical axes of the illumination lights of the lamps 20, 30, and 40 are arranged according to the reflecting surface of the reflecting member 80, and are arranged at positions that form an angle of 90 degrees with each other. By arranging in this way, for example, as compared with the lamp arrangement state shown in FIG. 5, the area required for lamp arrangement in the Y direction is reduced. Therefore, in this modification, when there is a restriction on the arrangement position of the lamps, it is possible to adjust the arrangement position of the lamps corresponding to the reflection surfaces by providing more reflection surfaces than the number of lamps. .

  Furthermore, in this modification, the pyramid shape may not be a regular quadrangular pyramid shape in which each reflecting surface has the same shape, but a quadrangular pyramid shape having different reflecting surface shapes. By doing so, the direction of the perpendicular of each reflecting surface can be changed, so that the arrangement position of the lamp corresponding to the reflecting surface can be adjusted.

  An example of this is shown in FIG. As shown in the drawing, the lamp 20 and the lamp 40 are moved and arranged in the Y minus direction by the reflecting member 80a having a quadrangular pyramid shape with different reflecting surfaces. As a result, as compared with the lamp arrangement state shown in FIG. 6A, the area required for lamp arrangement in the Y direction can be further reduced.

(Fourth modification)
In the above embodiment and the modification, the inclination angle of the reflecting surface (pyramidal surface) is set to 45 degrees with respect to the bottom surface of the reflecting member (pyramidal surface), and each lamp is arranged in the XY plane. The inclination angle of the reflecting surface may be made larger or smaller than 45 degrees with respect to the bottom surface. In this way, each lamp can be offset in the Z direction, which is effective when there is a restriction on the position of the lamp in the Z direction.

  This modification will be described with reference to FIG. FIG. 7 is a schematic diagram showing an example of applying the present modification in which the inclination angle of the reflecting surface is smaller than 45 degrees with respect to the bottom surface in the above embodiment. FIG. 7A shows a state in which the lamps 20, 30, 40, 50 and the reflecting member 80b used in this modification are viewed from the Z direction, and FIG. 7B shows them from the Y direction. Shows the state.

  As shown in the drawing, the reflecting member 80b has a reflecting surface 82 and a reflecting surface 84 of each pyramid surface, that is, the reflecting surface, formed at an inclination angle smaller than 45 degrees with respect to the bottom surface of the reflecting member 80b. Therefore, the perpendicular direction of the reflecting surface 82 irradiated by the light beam 25 of the lamp 20 and the perpendicular direction of the reflecting surface 84 irradiated by the light beam 45 of the lamp 40 are inclined in the Z plus direction. Of course, although the description is omitted, if the reflecting surface 82 and the reflecting surface 84 are formed at an inclination angle larger than 45 degrees with respect to the bottom surface of the reflecting member 80b, the lamp 20 and the lamp 40, on the contrary, Offset in the negative direction.

  Thus, according to this modification, by changing the inclination angle of each reflecting surface with respect to the bottom surface of the reflecting member, each lamp is changed in the Z plus direction and the Z minus direction according to the changed inclination angle. Since it can be arranged with an offset amount, it is effective when the arrangement position of the lamp is restricted in the Z direction.

(5th modification)
In the above-described embodiments and modifications, no particular mention was made of the amount of illumination light emitted from each lamp, but the amount of lamp light used may be different. At this time, with respect to the illumination light emitted from the lamp, the area of the light beam collected at the time of irradiating the reflecting surface is increased according to the amount of light, for example, from the intention of suppressing the local temperature rise of the reflecting surface. To do. Therefore, in this modification, the reflective surface shape is made different according to the light amount, and the area of the reflective surface is increased according to the illumination light with a large amount of light (that is, the luminous flux area is large at the time of irradiation of the reflective surface). The amount of illumination light loss at the time is suppressed.

  This modification will be described with reference to FIG. FIG. 8 is a schematic diagram showing an example in which the present modification is applied to the second modification (FIG. 5). Three lamps 20, 30, 40 and three reflecting surfaces 72a, 73a, which are pyramid surfaces are shown. The reflecting member 70a having the shape of a regular triangular pyramid 74a is shown as viewed from the Z plus direction.

  Of the three lamps, the lamp 40 is larger in shape than the other lamps and has a larger amount of illumination light. The reflective surface 72a and the reflective surface 73a form an angle of 45 degrees with respect to the bottom surface of the reflective member 70a, but the reflective surface 74a is formed with an angle smaller than 45 degrees with respect to the bottom surface. By forming in this way, each reflective surface exhibits a different shape.

  As a result, the reflecting surface 74a has a larger area than the other reflecting surfaces 72a and 73a, so that the reflecting surface 72a or the reflecting surface to which the luminous flux 45 of the lamp 40 irradiates the area of the reflecting surface 73a. The area of 74a can be increased. Therefore, by increasing the area of the reflecting surface by changing the shape of the reflecting surface in accordance with the lamp 40 having a large amount of irradiated light, the condensed light beam can be obtained even if the area of the light beam condensed on the reflecting surface is increased. Therefore, it is possible to suppress a loss in the amount of illumination light during reflection.

  Here, in this modification, for example, the lamp 20 emits illumination light having the respective wavelengths of R light and the lamp 30 emits the G light, and the lamp 40 having a large amount of light emits illumination light having the wavelength of B light. It is good to inject. In general, the visual sensitivity of the B light is low with respect to the R light and the G light. By doing so, the visual sensitivity of the light of each color can be made uniform. In the present modification, the reflecting surface 74a is inclined with respect to the bottom surface of the reflecting member 70a at an angle smaller than 45 degrees, so that the lamp 40 is offset in the Z plus direction.

(Other variations)
In the above embodiments and modifications, the pyramid shape of the reflecting member has a triangular shape so that the reflecting surface, which is a pyramid surface, comes into contact with each other and forms a top vertex and a bottom surface. Of course, it is not limited to this. What is necessary is just to be formed by the pyramid surface which has the area | region range which includes the light beam irradiated to a reflective surface at least. Therefore, each reflecting surface may have a trapezoidal shape that does not form a head apex portion, for example. Moreover, the polygonal shape by which the corner | angular part in the bottom face part of pyramid shape was shaved may be sufficient.

  Moreover, you may make it combine the said Example and said modification. For example, you may make it change the inclination angle with respect to the bottom face of a reflective surface while changing the perpendicular direction of a reflective surface. In this way, the arrangement position of the lamp can be adjusted in the XY plane, and the arrangement position of the lamp can be adjusted by offsetting in the Z direction at the same time, so that the adjustment range can be expanded.

  In the above embodiment, the light beam emitted from each lamp overlaps the lens 90 when viewed in the Z direction so that the illumination light from the lamps overlaps the light bulb. However, it is needless to say that the present invention is not limited to this. For example, the illumination light emitted from each lamp may be arranged adjacent to the X direction or the Y direction as viewed in the Z direction to illuminate the illumination area divided on the light valve.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram illustrating a configuration of a lighting device and a projector according to an embodiment of the present invention. The perspective view which showed the arrangement | positioning condition of a lamp | ramp, a condensing lens, and a reflective member. The schematic diagram which showed the state which looked at the illuminating device of a present Example from the Z direction. The schematic diagram which showed the lamp | ramp which the illuminating device of a 1st modification uses. The schematic diagram which showed the reflecting member which consists of three lamps and three pyramid surfaces in the 2nd modification. In the third modification, (a) is a schematic diagram in which the reflective member is a regular quadrangular pyramid-shaped reflective member, and (b) is a schematic diagram in which the shape of the reflective surface is different from each other. The schematic diagram for demonstrating a 4th modification. The schematic diagram for demonstrating a 5th modification.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Projector, 11, 12 ... Lens, 15 ... Light valve, 16 ... Projection lens, 18 ... Screen, 20 ... Lamp, 21 ... Condensing lens, 25 ... Light flux, 30 ... Lamp, 31 ... Condensing lens, 35 ... Luminous flux 40 ... lamp 41 ... condensing lens 45 ... luminous flux 50 ... lamp 51 ... condensing lens 55 ... luminous flux 70 ... reflecting member 70a ... reflecting member 72, 72a, 73, 73a, 74, 74a ... reflecting surface, 80, 80a, 80b ... reflecting member, 82 ... reflecting surface, 84 ... reflecting surface, 88 ... head apex, 90 ... lens, 100 ... illuminating device, 401 ... lamp, 401H ... reflecting mirror, 401L ... light emission Part, 401R: light reflecting surface.

Claims (6)

An illumination device that emits illumination light to a light modulation device,
A plurality of light sources, and a reflecting member provided with a plurality of reflecting surfaces,
The plurality of light sources includes at least first to third light sources,
The plurality of reflective surfaces include at least first to third reflective surfaces,
The first light emitted from the first light source is reflected by the first reflecting surface,
The second light emitted from the second light source is reflected by the second reflecting surface,
Third light emitted from the third light source is reflected by the third reflecting surface,
The reflected first to third lights are emitted as the illumination light,
Each of said 1st thru | or 3rd reflective surfaces is provided so that at least one part of the pyramid surface which comprises pyramid shape may be formed. The lighting device according to claim 1,
At least one light source among the plurality of light sources is provided with a condensing means for irradiating the light emitted from the light source to the reflection surface on which the light is reflected. Lighting device. The lighting device according to claim 2,
At least one of the plurality of light sources includes a light emitting unit and a reflecting mirror, and the light collecting unit provided in the light source is the reflecting mirror included in the light source. . A lighting device according to any one of claims 1 to 3,
The lighting device according to claim 1, wherein the first light is red light, the second light is green light, and the third light is blue light. The illumination device according to any one of claims 1 to 4,
An illumination device, wherein a reflection surface shape of at least one of the plurality of reflection surfaces is different from a reflection surface shape of another reflection surface.   A projector comprising: a light modulation device that modulates illumination light; and the illumination apparatus according to claim 1 that irradiates the light modulation device with the illumination light.

Images