JP6597200B2 - Illumination device and image projection device - Google Patents

Description

  The present invention relates to an illumination device and an image projection device.

  There is known a wavelength conversion technique in which fluorescent materials such as green and red are obtained by irradiating a fluorescent material with excitation light having a relatively short wavelength such as a blue laser or LED, and the fluorescence is used as illumination light. Since an individual light source such as a blue laser is a light source device with good response, it is widely deployed as a light source of an image projection apparatus (hereinafter referred to as “projector”). Attempts have been made to efficiently extract various illumination light, particularly green light, using the most efficient blue solid light source.

  In this case, since the illumination light can be efficiently guided to the display panel of the projector when the size of the light source is smaller, many products collect the excitation light and irradiate the phosphor. However, since the irradiation area of the excitation light to the phosphor is small and a necessary amount of fluorescence cannot be obtained, a projector in which the phosphor is arranged on a light guide member that guides illumination light has been developed (for example, Patent Document 1). reference).

  In the projector of Patent Document 1, a plurality of optical paths of excitation light are switched, and excitation light is sequentially irradiated onto a plurality of phosphors applied in a light tunnel to obtain fluorescence having a necessary wavelength. By irradiating the phosphor with the beam-shaped excitation light, the irradiated part becomes the secondary light source, and the fluorescence is emitted, and it is internally reflected several times to the exit of the light tunnel, making the illumination distribution uniform Has been made. In recent years, it has been desired to develop a technique capable of obtaining a plurality of colors of illumination light with a sufficient amount of light by combining an individual light source and a phosphor.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an illuminating device that can extract a plurality of colors of light having a sufficient amount of light.

In order to achieve the above object, an illumination device according to the present invention includes a first light source that emits first light having a first wavelength component, and a first wavelength component using the first light as excitation light. A first light guide member including a wavelength conversion member that generates second light that has been wavelength-converted to a second wavelength component different from the second light component, and a second light that emits third light having a third wavelength component A second light source comprising: a light source; a second light guide member that transmits second light and third light; and a fourth light source that emits fifth light having a fifth wavelength component. Are arranged such that the first light guide member and the second light guide member are connected so that the second light guide member is incident on the second light guide member. The second light and the third light are emitted on the side different from the connection side, and the first light guide member includes the second light including the second wavelength component. Convert to A first light guide unit including one wavelength conversion member, and a second wavelength conversion for converting fifth light from the fourth light source into sixth light including a sixth wavelength component different from the second wavelength component. The second light guide part including the member is joined to each other, and the first light guide part and the second light guide part include the second light emitted from the first light guide part and the second light guide part, and The sixth light is configured to be incident on the second light guide member .

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can take out the light of multiple colors of sufficient light quantity can be provided.

It is an optical diagram of the illuminating device which concerns on 1st Embodiment of this invention, Comprising: It is the figure which represented typically the state which turned on the 2nd light source by the side of a transparent rod, and radiate | emitted blue light. It is an optical diagram of the illuminating device which concerns on 1st Embodiment of this invention, Comprising: It is the figure which represented typically the state which turned on the 1st light source by the side of a phosphor rod, and radiate | emitted yellow light (fluorescence). . It is an optical diagram of the illuminating device which concerns on 1st Embodiment of this invention, Comprising: The state which turned on the 1st, 2nd light source and radiate | emitted the white light which the blue light and the yellow light were radiate | emitted is shown typically. FIG. It is the perspective view which looked at the illuminating device which concerns on 1st Embodiment of this invention from the light source side. It is an optical diagram of the illuminating device which concerns on 2nd Embodiment of this invention, Comprising: It represents typically the state which turned on all the light sources and radiate | emitted the white light which synthesize | combined blue light, green light, and red light. FIG. It is an optical diagram of the illuminating device which concerns on 3rd Embodiment of this invention, Comprising: It represents typically the state which turned on all the light sources and radiate | emitted the white light which synthesize | combined blue light, green light, and red light. FIG. It is an optical diagram of the image projection apparatus (projector) which concerns on 4th Embodiment of this invention. It is an optical diagram of the image projection apparatus (projector) which concerns on 5th Embodiment of this invention. It is the schematic which shows the example of a combination of the color of the illumination light radiate | emitted from the illuminating device shown in FIG. 5, and a color wheel (CW), and a projection light image. It is the schematic which shows the other example of the combination of the color of the illumination light radiate | emitted from the illuminating device shown in FIG. 5, and a color wheel (CW), and a projection light image. It is the schematic which shows the other example of the combination of the color of the illumination light radiate | emitted from the illuminating device shown in FIG. 5, and a color wheel (CW), and a projection light image. It is the schematic which shows the other example of the combination of the color of the illumination light radiate | emitted from the illuminating device shown in FIG. 5, and a color wheel (CW), and a projection light image. It is an optical diagram of the image projection apparatus (projector) which concerns on 6th Embodiment of this invention. It is an optical diagram of the image projection apparatus (projector) which concerns on 7th Embodiment of this invention.

(First embodiment)
Below, one Embodiment of the illuminating device which concerns on this invention is described, referring the optical figure of FIG. 1A-FIG. 1C, and the perspective view of FIG. 1D.

  As shown in these drawings, the lighting device 1 of the first embodiment includes a first light source 2, a second light source 3, a phosphor rod 10 as a first light guide member, and a second light guide. And a transparent rod 20 as an optical member.

  The first light source 2 functions as an excitation light source, and emits first light having a first wavelength component as excitation light E. In the present embodiment, as shown in FIG. 1D, the plurality of first light sources 2 are arranged in the longitudinal direction so as to be close to one side of the phosphor rod 10.

  The second light source 3 functions as an illumination light source and emits third light having a third wavelength component as illumination light. In the present embodiment, as shown in FIG. 1D, a plurality of second light sources 3 are arranged in the longitudinal direction so as to be close to one side of the transparent rod 20. In the present embodiment, the second light source 3 is arranged on one side of the transparent rod 20 on the same plane as the one side of the phosphor rod 10 on which the first light source 2 is arranged. It is not limited to. The second light source 3 can be arranged on another side surface according to the purpose of use, design, or the like.

  In the present embodiment, as the first light source 2 and the second light source 3, a light emitting diode (blue LED) that generates blue light, which is one of solid state light emitting elements, is used. The wavelength component is made the same wavelength component, so that the configuration and control of the illumination device 1 are simplified. As blue LED, what generate | occur | produces the blue light of wavelength 400nm -470nm can be used, for example.

  The phosphor rod 10 is formed of a material containing a phosphor 11 that is an example of a wavelength conversion member, and has a solid rectangular parallelepiped structure having six faces. The phosphor 11 is irradiated with the excitation light E from the first light source 2 to generate second light whose wavelength is converted to a second wavelength component different from the wavelength component of the excitation light E. As the phosphor 11, a known appropriate material can be used. In the present embodiment, a fluorescent material that generates yellow fluorescence containing a yellow component (for example, a wavelength of 450 nm to 750 nm) as the second wavelength component is used. Yes. Therefore, the phosphor 11 is excited by the excitation light E and generates yellow light Y as the second light.

  The phosphor rod 10 can be formed by containing the phosphor 11 in a transparent material such as glass, or can be formed by crystallizing the phosphor 11, for example, using a YAG single crystal phosphor. it can.

  In the phosphor rod 10, one side surface on which the first light source 2 is disposed functions as an incident surface (incident part) 12 on which the excitation light E is incident. The inside of the phosphor rod 10 functions as a light guide path 13 through which the yellow light Y wavelength-converted by the phosphor 11 transmits and propagates.

  One end of the transparent rod 20 is connected to the other end of the phosphor rod 10 from which the yellow light Y is emitted to form a connecting portion 14. The yellow light Y propagated in the light guide path 13 of the phosphor rod 10 enters the transparent rod 20 through the connecting portion 14.

  The transparent rod 20 is formed of a transparent material that does not contain the phosphor 11 and has a solid rectangular parallelepiped structure having six surfaces. With this configuration, the transparent rod 20 has a function of transmitting yellow light Y and blue light B. In the present embodiment and the following embodiments, the phosphor rod 10 and the transparent rod 20 have the same length, but the present application is not limited to this, and the lengths differ from each other depending on the purpose of use, design, and the like. For example, the length may be set appropriately.

  One side surface of the transparent rod 20 on which the second light source 3 is disposed functions as an incident surface (incident part) 21 on which the blue light B is incident. Further, the transparent rod 20 has a light guide path 22 through which the yellow light Y and the blue light B are transmitted and propagated, and the other end surface opposite to the connecting portion 14 has the yellow light Y and the blue light B. Functions as an exit surface (exit portion) 23 from which the light exits.

  On one end face of the phosphor rod 10 in the longitudinal direction, a reflecting portion 15 that reflects light is provided. In addition, reflecting portions 16 and 24 are provided on the side surface facing the incident surface 12 of the phosphor rod 10 and the side surface facing the incident surface 21 of the transparent rod 20, respectively. Therefore, it is possible to minimize yellow light Y and blue light B from being emitted to the outside of the rods 10 and 20 from other than the emission surface 23 of the transparent rod 20.

  In addition, a reflection part can also be provided in the whole side surfaces other than the entrance surfaces 12 and 21 of each rod 10 and 20, and the emission of light from other than the exit surface 23 of the transparent rod 20 can be suppressed to a minimum. The reflecting portions 15, 16, and 24 can be formed by a reflecting mirror, or can be realized by a configuration that totally reflects light using a difference in refractive index.

  The operation of the illumination device 1 of the present embodiment configured as described above will be described with reference to FIGS. 1A to 1C.

  In the example shown in FIG. 1A, only the second light source 3 composed of a blue LED disposed in proximity to the transparent rod 20 is lit. In this example, all the second light sources 3 are turned on at the same light emission amount at the same time. However, in FIG. 1A, among the plurality of second light sources 3, the second light source 3 at the left end of the paper surface is easy to understand. The optical path of blue light B of only the light source 3 is displayed.

  As shown in FIG. 1A, the blue light B emitted from the second light source 3 enters the transparent rod 20 from the incident surface 21 of the transparent rod 20. The blue light B is repeatedly reflected by the side surfaces of the transparent rod 20 to make the illumination distribution uniform, propagate through the light guide path 22, and then exit from the exit surface 23. Thereby, only the blue light B can be taken out from the illumination device 1.

  In the example shown in FIG. 1B, only the first light source 2 made of a blue LED arranged close to the phosphor rod 10 is lit. Also in FIG. 1B, only the optical path of the first light source 2 at the left end of the drawing among the plurality of first light sources 2 is displayed.

  As shown in FIG. 1B, the excitation light E emitted from the first light source 2 enters the phosphor rod 10 from the incident surface 12 of the phosphor rod 10 and is irradiated to the phosphor 11. The excitation light E is wavelength-converted to yellow light Y by the phosphor 11. The yellow light Y is repeatedly reflected by the side surface of the phosphor rod 10 to make the illumination distribution uniform, propagates through the light guide path 13, and then enters the transparent rod 20 through the connecting portion 14. The yellow light Y incident on the transparent rod 20 propagates through the light guide path 22 while being repeatedly reflected by the side surfaces of the transparent rod 20, and then exits from the exit surface 23. Thereby, only the yellow light Y can be taken out from the illumination device 1.

  In the example shown in FIG. 1C, all of the first light source 2 and the second light source 3 are turned on. Also in FIG. 1C, only the optical paths of one first light source 2 and second light source 3 are displayed.

  In the example shown in FIG. 1C, the excitation light E emitted from the first light source 2 enters the phosphor rod 10 from the incident surface 12 by the same action as the example shown in FIGS. 1A and 1B, and the phosphor 11 is converted into a wavelength of yellow light Y. The yellow light Y propagates in the light guide path 13 while repeating reflection, then enters the transparent rod 20 through the connecting portion 14, and propagates in the light guide path 22 toward the exit surface 23 while repeating reflection. . Similarly, the blue light B emitted from the second light source 3 enters the transparent rod 20 from the incident surface 21 and propagates in the light guide path 22 in the direction of the output surface 23 while repeating reflection.

  From the emission surface 23, white light W in which yellow light Y and blue light B are synthesized is emitted. Thereby, the white light W can be extracted from the lighting device 1.

  As described above, according to the first embodiment, the excitation light E from the first light source 2 is wavelength-converted by the phosphor 11 to obtain the yellow light Y, and the blue light B is obtained from the second light source 3. Is emitted from the exit surface 23 of the transparent rod 20. Also, white light W in which yellow light Y and blue light B are mixed can be extracted. Further, since the transparent rod 20 is used as the second light guide member that guides and emits the yellow light Y from the phosphor rod 10, the yellow light Y can be transmitted without exerting an optical action. Therefore, the illuminating device 1 which can take out the light of several colors of sufficient light quantity as illumination light can be provided.

  In the first embodiment, since the yellow light Y is generated using the yellow phosphor 11, it becomes possible to extract green light and red light from the yellow light Y, and more colors of illumination light can be obtained. It can be taken out.

  In the first embodiment, since the first light source 2 is arranged close to one side of the phosphor rod 10, the excitation light E from the first light source 2 is efficiently applied to the phosphor rod 10. It becomes possible to make it enter. Furthermore, since the second light source 3 is arranged close to one side of the transparent rod 20, the blue light B from the second light source 3 can be efficiently incident on the transparent rod 20. It becomes. In addition, by arranging the light sources 2 and 3 so as to be close to the rods 10 and 20 as described above, the lighting device 1 can be reduced in size.

  Moreover, since the other end surface of the phosphor rod 10 and one end surface of the transparent rod 20 are connected to each other, yellow light Y from the phosphor rod 10 can be efficiently incident on the transparent rod 20. It becomes.

  In the first embodiment, the reflecting portions 16 and 24 are provided on all or a part of the side surfaces other than the incident surfaces 12 and 21 on which the excitation light E and the blue light B of the rods 10 and 20 are incident. By providing the reflecting portion 15 on one end face, light emission from the side face or one end face is suppressed. Further, with this configuration, it is possible to reflect the yellow light Y generated by divergence from the phosphor 11 and efficiently guide it into the light guide path 13.

  Note that a reflection surface that reflects the excitation light E can be provided at the connecting portion 14 between the phosphor rod 10 and the transparent rod 20. With this configuration, it is possible to prevent the excitation light E that has not been wavelength-converted by the phosphor 11 from entering the transparent rod 20 and to irradiate the phosphor 11 with the reflected excitation light E again. By providing such a reflection part, the optical efficiency of the lighting device 1 can be improved.

  Further, in the phosphor rod 10, a wavelength selection member such as a dichroic filter that transmits the excitation light E having the first wavelength component to the incident surface 12 of the excitation light E and reflects the yellow light Y having the second wavelength component. It is desirable to provide. Thereby, while efficiently making the excitation light E incident from the incident surface 12, the yellow light Y generated by divergence from the phosphor 11 can be efficiently reflected by the wavelength selection member and guided into the light guide path 13, The yellow light Y can be emitted efficiently.

  In the first embodiment, blue LEDs are used as the first light source 2 and the second light source 3, but the present application is not limited to this, and a blue laser diode (LD) or the like may be used. it can. The first light source 2 that functions as an excitation light source may be an LD or LED that generates light other than blue light, or an LD that generates a wavelength region in the ultraviolet region. Also, a combination of these can be used. The second light source 3 functioning as an illumination light source can also be an LD or LED that generates light other than blue light, or a combination thereof, so as to emit illumination light of a desired color. By using solid light sources such as LEDs and LDs as the first light source 2 and the second light source 3, it is possible to improve the light emission efficiency of the phosphor 11.

  In particular, by using a blue LED, the excitation light E and the blue light B are emitted from the first light source 2 and the second light source 3, respectively. Therefore, the excitation light E and the blue light B can be efficiently incident on the phosphor rod 10 and the transparent rod 20, respectively, without using an optical element such as a diffusion lens. Further, coupled with the arrangement of the light sources 2 and 3 in the vicinity of the rods 10 and 20, it is possible to reduce the size of the lighting device 1 and improve the degree of design freedom.

  Further, in the first embodiment, the plurality of first light sources 2 and the plurality of second light sources 3 are all turned on with the same light emission amount, but the present application is not limited to this. The light emission amount of the first light source 2 and the light emission amount of the second light source 3 can be arbitrarily changed to a desired light emission amount. In this case, it is possible to change the light emission amount to a desired level by arbitrarily setting the number of the first and second light sources 2 and 3 to be lit. Alternatively, all of the first and second light sources 2 and 3 are turned on, but the light emission intensity can be changed to a desired light emission amount by appropriately adjusting the light emission intensity. Thereby, the light quantity of the yellow light Y and the blue light B radiate | emitted from the illuminating device 1 can be changed freely.

  In addition, when the white light W is emitted, the light intensity of each of the light sources 2 and 3 is changed as appropriate, and the balance of the light intensity of the yellow light Y and the blue light B is changed. It is also possible to change the color.

  Further, by reducing the light emission amount of the light sources 2 and 3 in the vicinity of the connecting portion 14 between the phosphor rod 10 and the transparent rod 20, and increasing the light emission amount of the light sources 2 and 3 at positions away from the connecting portion 14, Even without providing a reflection portion or the like, it is possible to suppress the color mixture of light in the vicinity of the connecting portion 14 and increase the color purity of the yellow light Y and the blue light B.

  As described above, by changing the number and intensity of the light sources 2 and 3, the lighting position, etc., as appropriate, or by combining them appropriately, light of various colors can be emitted, and the color can be adjusted. It becomes possible, and the illuminating device 1 which can radiate | emit illumination light of various colors can be obtained.

  In addition, a wavelength selection member such as a dichroic filter that transmits yellow light Y and reflects excitation light E can be provided at the connecting portion 14 between the phosphor rod 10 and the transparent rod 20. With this configuration, when the yellow light Y is extracted, the blue light component derived from the excitation light E that has not been converted to the yellow light Y by the phosphor 11 is incident on the transparent rod 20 side and mixed with the yellow light Y. Can be suppressed. Further, when the blue light B is extracted, the blue light B is prevented from being incident on the phosphor rod 10 from the coupling portion 14 and being converted into the yellow light Y, and the yellow light Y is mixed with the blue light B. Can be suppressed. As a result, yellow light Y and blue light B with higher color purity can be extracted.

  Moreover, in 1st Embodiment, although the excitation light E of the 1st light source 2 and the blue light B of the 2nd light source 3 are made into the same wavelength component, this application is not limited to this. The wavelength components can be different from each other, and optimum wavelength components can be used as the excitation light E and the blue light B (illumination light) for projection, respectively. For example, when the first wavelength component of the first light functioning as the excitation light E is a blue component on the short wavelength side, the wavelength conversion efficiency in the phosphor 11 can be further increased. On the other hand, by using the third wavelength component of the second light source 3 used as illumination light (blue light B) as a blue component on the long wavelength side, blue light B with higher color purity is obtained as illumination light. Is possible.

  Further, the phosphor rod 10 is used as the first light guide member which is solidly formed of a transparent material containing the phosphor 11, but the present invention is not limited to this. As the first light guide member, for example, a flat mirror or a hollow rectangular parallelepiped obtained by combining four surfaces of a dielectric multilayer film, a metal-coated plate material, a metal plate, or the like can be used. In this case, the incident surface 12 for the excitation light E is formed by a dichroic filter or the like that transmits the excitation light E, and the phosphor 11 is disposed on the mirror surface to which the excitation light E is irradiated. Moreover, a reflection part can also be provided in one end surface so that light may not radiate | emit from one end surface.

  With this configuration, the excitation light E incident on the first light guide member via the incident surface 12 is irradiated to the phosphor 11, and second light such as yellow light Y is generated. The second light is reflected by the mirror surface, propagates through the light guide path 13, exits from the opening on the other end side, and enters the second light guide member.

  Further, the second light guide member is not limited to the solid transparent rod 20 formed of a transparent material such as glass. As the second light guide member, a hollow cuboid in which a plane mirror or a reflection film is provided on the inner surface, but four plate glasses or the like are combined can be used. Also in this case, the incident surface 21 of the blue light B is formed by a dichroic filter or the like that transmits the blue light B.

  With this configuration, the second light is incident on the first light guide member from the first light guide member via the connecting portion, reflected by the mirror surface, and then emitted from the opening on the other end side. . Further, the blue light B from the second light source 3 is incident from the incident surface 21, reflected by the mirror surface, and then emitted from the opening on the other end side. The incident surface 21 made of a dichroic filter allows the blue light B to enter, but the incident blue light B is reflected by the mirror surface and then obliquely faces the incident surface 21, so that the incident surface 21 21 is totally reflected. Therefore, it is possible to suppress the blue light B from being emitted from the incident surface 21 to the outside.

  Even when the first light guide member or the second light guide member made of a hollow rectangular parallelepiped having the above-described configuration is used, the yellow light Y and the blue light B are efficiently reflected and guided to be emitted from the emitting portion. Therefore, it is possible to obtain the lighting device 1 having excellent optical efficiency. Note that both the first light guide member and the second light guide member can be formed of the hollow rectangular parallelepiped as described above, or one light guide member is a solid cube and the other light guide member Can be a hollow rectangular parallelepiped.

(Second Embodiment)
Next, an illuminating device according to a second embodiment of the present invention will be described with reference to FIG. The illuminating device 1A of the second embodiment shown in FIG. 2 uses a green phosphor 11A that generates green light G in place of the phosphor 11 that generates yellow light Y, and further includes a third light source 4. It has the same basic configuration as the illumination device 1 of the first embodiment, and includes a first light source 2 that emits excitation light E, a second light source 3 that emits blue light B, a phosphor rod 10A, A transparent rod 20 and a connecting portion 14 are provided. The phosphor rod 10 </ b> A includes an incident surface 12, a light guide path 13, and reflecting portions 15 and 16, and the transparent rod 20 includes an incident surface 21, a light guide path 22, and an output surface 23.

  In the second embodiment, in addition to these members, a third light source that emits red light R as fourth light having a fourth wavelength component different from those of the first light source 2 and the second light source 3. 4 is disposed on the side surface of the transparent rod 20 opposite to the side surface on which the second light source 3 is disposed. This side surface functions as the incident surface 25 of the red light R. In the second embodiment, a red LED is used as the third light source 4, but a red LD or the like can also be used.

  The phosphor 11A of the phosphor rod 10A of the second embodiment uses a fluorescent material that generates green fluorescence (green light G) including a green component (for example, a wavelength of 450 nm to 600 nm) as a second wavelength component.

  In the illuminating device 1A of the second embodiment configured as described above, the first light source 2 is turned on by the same action as the first embodiment, so that the excitation light E is converted into the green light G by the phosphor 11A. Converted. The green light G travels through the light guide path 13 of the phosphor rod 10 </ b> A and the light guide path 22 of the transparent rod 20, and then exits from the exit surface 23. Further, by turning on the second light source 3, the blue light B enters the transparent rod 20, propagates through the light guide path 22, and then exits from the exit surface 23.

  Similarly, by turning on the third light source 4, the red light R enters the transparent rod 20 from the incident surface 25, propagates through the light guide path 22, and then exits from the exit surface 23. In this way, the first, second, and third light sources 2, 3, and 4 are individually turned on to emit illumination light of three colors, green light G, blue light B, and red light R, from the illumination device 1A. Can be made.

  Further, by turning on all of the first, second, and third light sources 2, 3, and 4, the lights of the respective colors are combined, and as shown in FIG. 2, the white light W is extracted and emitted from the illumination device 1A. Can be made.

  As described above, also in the second embodiment, similarly to the first embodiment, it is possible to provide an illuminating device 1 </ b> A that can extract a plurality of colors of sufficient amount of light as illumination light. Furthermore, in the second embodiment, three colors of light, green light G, blue light B, and red light R, can be extracted, and more illumination light can be obtained, and the color and color of the emitted illumination light can be obtained. The degree of freedom in changing the taste and the like can be improved. Further, since the white light W is generated by synthesizing the three colors of the green light G, the blue light B, and the red light R, the degree of freedom of white color adjustment can be further improved.

  Further, as the third light source 4, a green LED that emits green light G is used instead of the red LED, and a red phosphor that generates red light R is used instead of the green phosphor 11A. It is also possible to change the color arrangement of the phosphor 11A. Even with this configuration, it is possible to take out three colors of light, ie, green light G, blue light B, and red light R, and white light W obtained by combining them.

  Also in the second embodiment, the light of each color can be efficiently emitted by using a reflecting portion or a dichroic filter on the connecting portion 14, side surface, incident surface 12, 21, etc. of each rod 10, 20, The color can be adjusted by appropriately changing the light emission amounts of the second and third light sources 2, 3 and 4.

  Further, one or both of the first light guide member and the second light guide member can be formed of a hollow cuboid in which four plane mirrors are combined. When the first light guide member is formed of a hollow rectangular parallelepiped, the incident surface 12 on which the excitation light E from the first light source 2 is incident is a dichroic filter that mainly transmits the blue wavelength component of the excitation light E. . In addition, the phosphor 11A is arranged on the mirror surface irradiated with the excitation light E. Moreover, a reflection part can also be provided in one end surface so that light may not radiate | emit from one end surface.

  When the second light guide member is formed of a hollow rectangular parallelepiped, the incident surface 21 on which the blue light B from the second light source 3 enters is a dichroic filter that mainly transmits the blue wavelength component. On the other hand, the incident surface 25 on which the red light R from the third light source 4 is incident is a dichroic filter that mainly transmits the red wavelength component. Accordingly, the blue light B and the red light R can be efficiently incident on the second light guide member, and the blue light B and the red light R can be efficiently emitted.

(Third embodiment)
Next, an illuminating device according to a third embodiment of the present invention will be described with reference to FIG. The illuminating device 1B of 3rd Embodiment shown in FIG. 3 replaces with the fluorescent substance rod 10, and is a fluorescent substance rod which consists of green rod part 10B1 (1st light guide part) and red rod part 10B2 (2nd light guide part). Except for using 10B, it has the same basic configuration as the illumination device 1 of the first embodiment, and the first light source 2 that emits the excitation light E and the second light source 3 that emits the blue light B. And a phosphor rod 10B, a transparent rod 20, and a connecting portion 14. The transparent rod 20 includes an incident surface 21, a light guide path 22, an exit surface 23, and a reflecting portion 24.

  The third embodiment further includes a fourth light source 5 that emits fifth light having a fifth wavelength component. In this embodiment, by using the same blue LED as the first light source 2 as the fourth light source 5, the fifth wavelength component is set to the same wavelength component as the first wavelength component. Therefore, the fourth light source 5 emits excitation light E having the same wavelength component as that of the first light source 2.

  The phosphor rod 10B of the third embodiment includes a rectangular parallelepiped green rod portion 10B1 including a phosphor 11B1 (first wavelength conversion member) that generates green light G, and a phosphor 11B2 (second wavelength) that generates red light R. A rectangular parallelepiped red rod portion 10B2 containing a conversion member) is vertically stacked so that the light guide paths 13a and 13b are parallel to each other. A reflecting portion 15 is provided on one end face of the phosphor rod 10B.

  For the phosphor 11B1, a fluorescent material that generates green fluorescence (second light: green light G) including a green component (for example, a wavelength of 450 nm to 600 nm) as the second wavelength component can be used. For the phosphor 11B2, a fluorescent material that generates red fluorescence (sixth light: red light R) including a red component (for example, a wavelength of 580 nm to 750 nm) as a sixth wavelength component can be used.

  The green rod portion 10 </ b> B <b> 1 and the red rod portion 10 </ b> B <b> 2 are joined to each other at the side surfaces facing each other. A plurality of first light sources 2 and a plurality of fourth light sources 5 that emit excitation light E are provided in the longitudinal direction in close proximity to the side surfaces of the rod portions 10B1 and 10B2 opposite to the joint portion 17 respectively. They are arranged side by side. The side surfaces on which the light sources 3 and 5 are arranged function as incident surfaces 12a and 12b on which the excitation light E is incident.

  In the illuminating device 1B of the third embodiment configured as described above, the first light source 2 is turned on so that the excitation light E enters the green rod portion 10B1 via the incident surface 12a and irradiates the phosphor 11B1. And wavelength conversion to green light G. The green light G propagates through the light guide path 13 a in the green rod portion 10 </ b> B <b> 1, then enters the transparent rod 20 through the connecting portion 14, propagates through the light guide path 22, and then exits from the exit surface 23.

  Further, by turning on the fourth light source 5, the excitation light E is incident on the red rod portion 10B2 via the incident surface 12b, irradiated to the phosphor 11B2, and wavelength-converted to the red light R. The red light R propagates through the light guide path 13b in the red rod portion 10B2, then enters the transparent rod 20 via the connecting portion 14, propagates through the light guide path 22, and then exits from the exit surface 23.

  Also, by turning on the second light source 3, the blue light B enters the transparent rod 20 through the incident surface 21, propagates through the light guide path 22, and then exits from the exit surface 23.

  In this manner, the first, second, and fourth light sources 2, 3, and 5 are individually turned on to emit illumination light of three colors, green light G, blue light B, and red light R, from the illumination device 1B. Can be made. Further, by turning on all of the first, second, and fourth light sources 2, 3, and 5, the light of each color is mixed, and as shown in FIG. 3, the white light W is extracted and emitted from the illumination device 1B. Can be made.

  As described above, also in the third embodiment, similarly to the first embodiment, it is possible to provide an illuminating device 1B that can extract a plurality of colors of light with a sufficient amount of light as illumination light. Furthermore, three colors of light, green light G, blue light B, and red light R, can be extracted, and more illumination light can be obtained. Further, since the white light W is generated by synthesizing the three colors of the green light G, the blue light B, and the red light R, the degree of freedom of white color adjustment can be further improved.

  In addition, by arranging a wavelength selection member such as a dichroic filter at the joint portion 17 between the green rod portion 10B1 and the red rod portion 10B2, it is possible to prevent both colors from being mixed and to emit light of each color efficiently. Is possible. In this case, for example, a dichroic filter that mainly reflects the green light G on the green rod portion 10B1 side and a dichroic filter that mainly reflects the red light R on the red rod portion 10B2 side are stacked and arranged. Further, a double-sided mirror or the like can be provided instead of the dichroic filter.

  Also in the third embodiment, it is possible to efficiently emit light of each color by using a reflecting portion or a dichroic filter on the connecting portion 14, the side surface, the incident surface, and the like. In addition, by making it possible to appropriately change the light emission amounts of the first, second, and fourth light sources 2, 3, and 5, it is possible to generate light of various colors and adjust the color.

  Further, one or both of the first light guide member and the second light guide member can be formed of a hollow cuboid in which four plane mirrors are combined. When the first light guide member is constituted by a hollow cuboid, the first light guide part and the second light guide part are each constituted by a hollow cuboid in which four plane mirrors are combined and joined to each other. To do. In addition, the side surface which becomes the junction part 17 can also be configured by sharing a single double-sided mirror.

  The incident surfaces 12a and 12b on which the excitation light E from the first light source 2 and the fourth light source 5 is incident are dichroic filters that mainly transmit the blue wavelength component of the excitation light E, and the excitation light E Phosphors 11B1 and 11B2 can also be arranged on the mirror surface irradiated with. Moreover, a reflection part can also be provided in one end surface so that light may not radiate | emit from one end surface of a 1st light guide member. When the second light guide member is formed of a hollow rectangular parallelepiped, the incident surface 21 on which the blue light B from the second light source 3 enters is a dichroic filter that mainly transmits the blue wavelength component. With such a configuration, green light G, red light R, and blue light B can be efficiently emitted.

  In addition, a reflection part that mainly reflects wavelength components other than the excitation light E can be provided on one or both of the incident surface 12a of the green rod portion 10B1 and the incident surface 12b of the red rod portion 10B2. With this configuration, the incident efficiency of the excitation light E, the light emission efficiency of the phosphors 11B1 and 11B2, the emission efficiency of the green light G and the red light R, and the like can be improved.

  In the third embodiment, the same blue LED is used as the first, second, and fourth light sources 2, 3, and 5, and the excitation light E and the blue light B having the same wavelength component are emitted. Yes. However, the present application is not limited to this, and the first and fourth light sources 2 and 5 that emit the excitation light E are wavelength components on the short wavelength side, and the second light source 3 is the wavelength component on the long wavelength side. It can also be. The first and fourth light sources 2 and 5 are also configured to emit optimal wavelength components to the green phosphor 11B1 and the red phosphor 11B2, respectively, thereby improving the light emission efficiency. it can.

(Fourth embodiment)
Next, an embodiment of an image projection apparatus (projector) according to the present invention including the above-described illumination apparatus will be described with reference to FIG. As shown in FIG. 4, the projector 100 as the image projection apparatus according to the fourth embodiment includes the illumination apparatus 1 according to the first embodiment, dichroic mirrors 30 and 31, reflection mirrors 32, 33, 34, and 3. A plate-type liquid crystal display (LCD) 35, 36, 37, a cross dichroic prism 38, a projection optical system 39, a control unit 40, a lighting drive unit 41, and the like are provided. The projector 100 is an apparatus that projects and enlarges an image on a screen Sc that is a projection surface.

  In the present embodiment, the lighting device 1 of the first embodiment is used, but the lighting devices 1A and 1B of the second and third embodiments can also be used. Moreover, in this embodiment, the 1st light source 2 and the 2nd light source 3 of the illuminating device 1 are turned on, and the white light W with which the yellow light Y and the blue light B were synthesize | combined is emitted.

  The control unit 40 controls the overall operation of the projector 100. The hardware configuration of the control unit 40 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The control unit 40 drives and controls each unit of the projector 100 using the RAM as a work memory in accordance with a program stored in advance in the ROM.

  The control unit 40 includes a lighting drive unit 41 that lights and drives the first light source 2 and the second light source 3 of the illumination device 1, liquid crystal displays 35, 36, and 37, a driving mechanism for the movable lens group of the projection optical system 39, and the like. It is connected. The control unit 40 captures image data from an image information source (storage unit) 42 of an external information device such as a personal computer. Based on this image data, the control unit 40 controls lighting of the first light source 2 and the second light source 3 by the lighting driving unit 41, ON / OFF control of the liquid crystal displays 35, 36, and 37, and in the projection optical system 39. Execute adjustment control for focus adjustment and zoom adjustment.

  The projection optical system 39 projects the projection image generated by the liquid crystal displays 35, 36, and 37 onto the screen Sc. The projection optical system 39 includes a fixed lens group provided in the fixed lens barrel and a movable lens group provided in the movable lens barrel. By moving this movable lens group, it is possible to perform focus adjustment and zoom adjustment.

  In the projector 100 according to the fourth embodiment configured as described above, the white light W is emitted from the illumination device 1 and is incident on the dichroic mirror 30 arranged in the optical path thereof. The dichroic mirror 30 has an optical performance of transmitting red light R and reflecting other wavelength components. Therefore, the red light R is extracted from the white light W by the dichroic mirror 30, guided to the reflection mirror 32, reflected, and then illuminates the liquid crystal display 35.

  On the other hand, light other than red light R (light in which green light G and blue light B are mixed) is reflected by dichroic mirror 30 and then enters dichroic mirror 31 disposed in the optical path. The dichroic mirror 31 has an optical performance of reflecting green light G and transmitting other light (blue light B). Therefore, after the green light G is reflected and extracted by the dichroic mirror 31, the liquid crystal display 36 arranged in the traveling direction is illuminated. Further, the blue light B transmitted through the dichroic mirror 31 is reflected by the reflection mirrors 33 and 34 and then illuminates the liquid crystal display 37 arranged in the optical path.

  In each of the liquid crystal displays 36, 36, and 37, a projection image of each color is generated, and the optical path is synthesized by the cross dichroic prism 38. The color image generated by the composition is enlarged and projected on the screen Sc by the projection optical system 39.

  As described above, in the fourth embodiment, by using the illumination devices 1, 1 </ b> A, and 1 </ b> B of the first to third embodiments, it is possible to obtain a sufficient amount of light of a plurality of colors as illumination light, and a brighter projector 100 can be provided.

  In the fourth embodiment, an example in which the image projection apparatus is applied to a 3LCD projector 100 has been described. However, the present application is not limited to this, and a known DLP system may be employed. .

  In the fourth embodiment, an example in which the image projection apparatus is applied to a 3LCD projector 100 has been described. However, the present application is not limited to this, and a known DLP system may be employed. . Hereinafter, embodiments (fifth to seventh embodiments) of an image projection apparatus (projector) adopting the DLP method will be described.

(Fifth embodiment)
An image projection apparatus (projector) 100A according to a fifth embodiment will be described with reference to FIG. As shown in FIG. 5, the projector 100A according to the fifth embodiment includes the illumination device 1 according to the first embodiment, condenser lenses 51 and 52, a color wheel (CW) 53 as a color component selection member, Light tunnel (LT) 54, relay lenses 55 and 56, mirrors 57 and 58, light modulation element (image generation unit) 59, projection optical system 39, control unit 40, lighting drive unit 41, etc. It is configured with.

  The light modulation element 59 is driven and controlled by the control unit 40 and forms a color projection image by gradation-controlling the illumination light of each color emitted from the illumination device 1 for each pixel. In the present embodiment, a DMD (Digital micromirror device) is used as the light modulation element 59.

  The color wheel 53 has a function of selectively extracting light of a predetermined color from the illumination light emitted from the illumination device 1 in a time-sharing manner. The color wheel 53 has a disk shape and is divided into a plurality of fan-shaped regions (segments). The color wheel 53 of the present embodiment includes a first color selection segment (first color selection region) 53a made of a color filter that selectively transmits red light R, and a color filter that selectively transmits green light G. The second color selection segment (second color selection region) 53b and the transparent segment (transmission region) 53c made of a transparent body that transmits the illumination light are provided in the circumferential direction. The color wheel 53 is provided with an electric motor 53m. When the electric motor 53m is rotationally driven by the control unit 40, the color wheel 53 rotates, and the segments 53a to 53c are sequentially arranged in the optical path of the illumination light.

  In the projector 100A according to the fifth embodiment having the above-described configuration, the lighting drive unit 41 controls the lighting of the first or second light source 2 or 3 so that the illumination device 1 emits illumination light of each color. The illumination light of each color is focused by the condenser lenses 51 and 52 and enters the color wheel 53, and light of a predetermined color is selected from the illumination light and is transmitted through the color wheel 53. The light flux that has passed through the color wheel 53 enters the light tunnel 54 and is repeatedly reflected in the light tunnel 54, whereby the luminance distribution is made uniform. The light beam emitted from the light tunnel 54 is collected by the relay lenses 55 and 56, guided to the mirror 57, reflected by the mirrors 57 and 58, and then guided to the light modulation element 59. The light modulation element 59 forms a projected image of each color by gradation-controlling the luminous flux of each color for each pixel. The projected images of the respective colors are sequentially enlarged and projected onto the screen Sc by the projection optical system 39, whereby a full-color image is formed on the screen Sc.

  In the projector 100A of the fifth embodiment, the color of the projection image (hereinafter referred to as “projection light”) can be freely adjusted by the combination of the illumination light emitted from the illumination device 1 and the segments 53a to 53c of the color wheel 53. Can do. 6A to 6D show examples of a graph showing the relationship between the color wheel 53 and the illumination light emitted from the illumination device 1 and a pie chart showing a projected light image. In each graph, the horizontal axis indicates the segments 53 a to 53 c of the color wheel 53, and the vertical axis indicates the color of the illumination light emitted from the illumination device 1. The pie chart on the right side of the graph represents an image of the color of the projection light generated by the light modulation element 59 by the combination of the segments 53a to 53c and the emission color of the illumination light.

  6A to 6D share the color wheel 53 and control the light emission order and combination of the first light source 2 and the second light source 3 to change the color of the illumination light emitted from the illumination device 1. The projected light image is changed. By changing the projected light image, it is possible to change the brightness and color of the projected image, such as a video mode that emphasizes brightness and a video mode that emphasizes color. Further, by controlling the light emission amounts or the number of lightings of the first light source 2 and the second light source 3, the light amount of each projection light can be freely changed. Therefore, the projection light can be set to an optimal brightness and color according to the video mode (referring to a mode for watching movies, a mode for watching sports, etc.).

  FIG. 6A shows an example in which red, green, and blue projection lights are sequentially projected. First, the lighting drive unit 41 turns on the first light source 2 close to the phosphor rod 10 under the control of the control unit 40, whereby yellow light Y is emitted from the lighting device 1 (see FIG. 1B). During the period in which the first color selection segment 53a is located in the optical path of the yellow light Y by the rotation of the color wheel 53, the red light R is extracted from the yellow light Y by the first color selection segment 53a, and the light modulation element 59 In this way, red projection light is projected. Further, in the period in which the second color selection segment 53b is located in the optical path of the yellow light Y, the green light G is extracted from the yellow light Y by the second color selection segment 53b and guided to the light modulation element 59. Green projection light is projected.

  Next, in the period when the transparent segment 53c is located in the optical path of the illumination light, the first light source 2 is turned off and the second light source 3 adjacent to the transparent rod 20 is turned on. As a result, the blue light B is emitted from the illumination device 1 (see FIG. 1A), and is transmitted through the transparent segment 53c arranged in the optical path, thereby projecting blue projection light.

  FIG. 6B shows an example in which red, green, white, and blue projection lights are sequentially projected. In this case as well, red projection light is projected by the combination of the first color selection segment 53a of the color wheel 53 and the yellow light Y from the illumination device 1 as in FIG. 6A. Further, green projection light is projected by the combination of the second color selection segment 53b and the yellow light Y.

  Next, the first light source 2 and the second light source 3 are turned on in the first half period in which the transparent segment 53c is located in the optical path of the illumination light, and the yellow light Y and the blue light B are combined from the illumination device 1. The white light W thus emitted is emitted (see FIG. 1C). The white light W is transmitted through the transparent segment 53c and guided to the light modulation element 59, whereby white projection light is projected. Next, in the second half period in which the transparent segment 53c is located in the optical path of the illumination light, the first light source 2 is turned off, only the second light source 3 is turned on, and the blue light B is emitted from the illumination device 1. . The blue light B is transmitted through the transparent segment 53c and guided to the light modulation element 59, whereby blue projection light is projected.

  When the white light W, which is a combination of the yellow light Y and the blue light B, is emitted from the lighting device 1, the intensity balance between the yellow light Y and the blue light B is determined by the lighting drive unit 41 by the first The light source 2 and the second light source 3 can be appropriately changed by controlling the light emission amount or the number of lighting. Thereby, the brightness and color of an image can be arbitrarily changed.

  FIG. 6C shows an example in which red, green, yellow, and blue projection lights are sequentially projected. In this case as well, red projection light is projected by the combination of the first color selection segment 53a of the color wheel 53 and the yellow light Y from the illumination device 1 as in FIG. 6A. Further, green projection light is projected by the combination of the second color selection segment 53b and the yellow light Y.

  Next, the first light source 2 is continuously turned on and the yellow light Y is emitted from the illuminating device 1 during a certain period of the first half when the transparent segment 53c is located in the optical path of the illumination light. The yellow light Y passes through the transparent segment 53c and is guided to the light modulation element 59, whereby yellow projection light is projected. Next, in the second half period in which the transparent segment 53c is located in the optical path of the illumination light, the first light source 2 is turned off, the second light source 3 is turned on, and the blue light B is emitted from the illumination device 1. The blue light B is transmitted through the transparent segment 53c and guided to the light modulation element 59, whereby blue projection light is projected.

  FIG. 6D shows an example in which red, green, yellow, white, and blue projection lights are sequentially projected. In this case as well, red projection light is projected by the combination of the first color selection segment 53a of the color wheel 53 and the yellow light Y from the illumination device 1 as in FIG. 6A. Further, green projection light is projected by the combination of the second color selection segment 53b and the yellow light Y.

  Next, in a period in which the transparent segment 53c is located in the optical path of the illumination light, the first light source 2 is continuously turned on for a certain period, and the yellow light Y is emitted from the illumination device 1. The yellow light Y passes through the third segment 53c and is guided to the light modulation element 59, whereby yellow projection light is projected. In the subsequent fixed period, the 1st light source 2 and the 2nd light source 3 are turned on, and the white light W with which the yellow light Y and the blue light B were synthesize | combined from the illuminating device 1 is radiate | emitted. The white light W is transmitted through the transparent segment 53c and guided to the light modulation element 59, whereby white projection light is projected. In the last fixed period, the first light source 2 is turned off, only the second light source 3 is turned on, and the blue light B is emitted from the illumination device 1. The blue light B is transmitted through the transparent segment 53c and guided to the light modulation element 59, whereby blue projection light is projected.

  The color of the projection light and the projection order of each color are not limited to the order described in the examples of FIGS. 6A to 6D, and the arrangement of the segments 53 a to 53 c of the color wheel 53 and the illumination device 1 emit the light. It can be freely changed according to the combination with the color of the illumination light. Further, in the example of FIGS. 6B to 6D, the order of the colors of the illumination light irradiated on the transparent segment 53c during the period in which the transparent segment 53c is located in the optical path is not limited to the order described above. The light sources 2 and 3 can be adjusted to an appropriate order depending on the lighting order or combination.

  As described above, in the fifth embodiment, by using the illuminating device 1 of the first embodiment, it is possible to obtain a plurality of colors of light having a sufficient amount of light as illumination light, and to provide a brighter projector 100A. Further, by combining the lighting device 1 and the color wheel 53, a plurality of projection lights can be generated, and the projector 100A can be downsized by reducing the number of light sources as compared with the case where light sources of respective colors are used. It becomes.

  In the fifth embodiment, the optical system that guides the illumination light to the light modulation element 59 by the two mirrors 57 and 58 is described as an example, but the present application is not limited to this configuration. An optical system that guides the illumination light to the light modulation element 59 using a spherical lens or a prism instead of the mirrors 57 and 58 can be applied to the projector 100A of the fifth embodiment. In the fifth embodiment, as shown in FIG. 5, two condenser lenses 51 and 52 and two relay lenses 55 and 56 are used. However, these numbers are also an example, and FIG. It is not limited to the configuration.

(Sixth embodiment)
An image projection apparatus (projector) 100B according to a sixth embodiment will be described with reference to FIG. Since the basic configuration and optical operation of the projector 100B according to the sixth embodiment shown in FIG. 7 are the same as those of the projector 100A according to the fifth embodiment, detailed description thereof is omitted. In the sixth embodiment, the lighting device 1 </ b> A according to the second embodiment is used instead of the lighting device 1, and the color wheel 53 is not used.

  In the projector 100B according to the sixth embodiment, the green light G can be emitted from the illumination device 1A by turning on the first light source 2 adjacent to the phosphor rod 10A by the lighting drive unit 41. Further, the blue light B can be emitted from the lighting device 1 </ b> A by turning on the second light source 3 adjacent to the transparent rod 20. Furthermore, the red light R can be emitted from the lighting device 1 </ b> A by turning on the third light source 4 adjacent to the transparent rod 20. The illumination light of each color emitted from the illumination device 1A is made uniform by the light tunnel 54 and then guided to the light modulation element 59, whereby the projection light of each color is projected on the screen Sc.

  As described above, also in the sixth embodiment, by using the illumination device 1A of the second embodiment, it is possible to obtain a plurality of colors of light having a sufficient amount of light as illumination light, and to provide a brighter projector 100B. Further, since the projection light of each color can be projected without using the color wheel (color component selection member) 53, the number of parts can be reduced, the light source is turned on, and the color wheel 53 is rotated. Therefore, it is possible to provide the projector 100B having a simpler configuration and control.

(Seventh embodiment)
An image projection apparatus (projector) 100C according to a seventh embodiment will be described with reference to FIG. Since the basic configuration and optical operation of the projector 100C according to the seventh embodiment shown in FIG. 8 are the same as those of the projector 100B according to the sixth embodiment, detailed description thereof is omitted. A projector 100 </ b> C according to the seventh embodiment uses a fly-eye lens 61 including a plurality of lenses instead of the light tunnel 54. Further, condensing lenses 51 ′ and 55 ′ are arranged on the upstream side and the downstream side of the fly-eye lens 61.

  Also in the projector 100C of the seventh embodiment, similarly to the projector 100B of the sixth embodiment, the lighting drive unit 41 controls the lighting of the light sources 2, 3, and 4 in an appropriate order, so that the green light G is emitted from the lighting device 1A. , Blue light B and red light R can be emitted in any order. Therefore, it is not necessary to use the color wheel 53, and as a result, it is possible to use the fly-eye lens 61 as light uniformizing means.

  The illumination light of each color emitted from the illumination device 1A is uniformly incident on the entire surface of the fly-eye lens 61 by the condenser lens 51 '. Illumination light that is made uniform by the fly-eye lens 61 and emitted from each lens is guided to the mirror 57 while gradually spreading by the condenser lens 55 ′, reflected by the mirrors 57 and 58, and then the entire light modulation element 59. Illuminate. Thereby, the projection light of each color is projected on the screen Sc.

  As described above, also in the seventh embodiment, by using the illuminating device 1A of the second embodiment, it is possible to obtain a sufficient amount of light of a plurality of colors as illumination light, and to provide a brighter projector 100C. Further, by using the fly-eye lens 61, it is possible to provide a projector 100C that is smaller than the case where the light tunnel 54 is used.

  In the projectors 100B and 100C of the sixth and seventh embodiments, the emission order of the illumination light of each color of RGB can be freely changed by appropriately changing the lighting order of the light sources 2, 3 and 4. Further, by turning on all the light sources 2, 3, and 4, it is possible to emit white light W from the illumination device 1A and project white projection light. In addition, by adjusting the amount of light emitted from each of the light sources 2, 3, and 4 and the number of lighting, it is possible to freely adjust the light quantity and color of the projection light. Moreover, it can replace with the illuminating device 1A which concerns on 2nd Embodiment, and can also use the illuminating device 1B which concerns on 3rd Embodiment shown in FIG. 3, and each color of RGB is controlled by lighting control of each light source 2,3,5. By emitting the illumination light and the white light W in an appropriate order, it is possible to obtain the same effect as when the illumination device 1A is used.

  As mentioned above, although the illuminating device and image projection apparatus of this invention have been demonstrated based on each embodiment, it is not limited to each embodiment about a concrete structure, Unless it deviates from the summary of this invention, it is a design change. Or additions are allowed. Further, the number, position, shape, and the like of the constituent members are not limited to each embodiment, and can be set to a number, position, shape, and the like that are suitable for carrying out the present invention. In each of the above-described embodiments, the example in which the image projection apparatus is applied to an image projection apparatus (projector) that projects and displays an image on a projection surface such as a screen has been described. However, the present invention is limited to these embodiments. Will never be done. For example, the present invention can be applied to an image projection apparatus or the like as an exposure apparatus that exposes a circuit pattern on a wafer in a semiconductor device production process.

1, 1A, 1B Illumination device 2 First light source 3 Second light source 4 Third light source 5 Fourth light source 10, 10A, 10B Phosphor rod (first light guide member)
10B1 Green rod part (first light guide part) 10B2 Red rod part (second light guide part)
11, 11A, 11B1, 11B2 Phosphors 12, 12a, 12b, 21, 25 Incident surface (incident part)
13, 13a, 13b, 22 Light guide path 14 Connecting portion 15, 16, 24 Reflecting portion 17 Joint portion 20 Transparent rod (second light guide member)
23 exit surface (exit section) 39 projection optical system 40 control section 53 color wheel (color component selection member)
53a First color selection segment (first color selection area)
53b Second color selection segment (second color selection area)
53c Transparent segment (transmission region) 59 Light modulation element (image generation unit)
100, 100A, 100B, 100C Projector (image projection device)

Japanese Patent No. 5510828

Claims (20)

A first light source that emits first light having a first wavelength component;
A first light guide member including a wavelength conversion member that generates second light that is wavelength-converted to a second wavelength component different from the first wavelength component using the first light as excitation light;
A second light source that emits third light having a third wavelength component;
A second light guide member that transmits the second light and the third light;
A fourth light source that emits fifth light having a fifth wavelength component ,
The first light guide member and the second light guide member are connected and arranged so that the second light is incident on the second light guide member,
The second light guide member has an emission part from which the second light and the third light are emitted on a side different from a connection side with the first light guide member ,
The first light guide member includes a first light guide unit including a first wavelength conversion member that converts the first light into the second light including the second wavelength component;
A second light guide including a second wavelength conversion member that converts the fifth light from the fourth light source into sixth light including a sixth wavelength component different from the second wavelength component; Composed of joined together,
The first light guide unit and the second light guide unit are configured to transmit the second light and the sixth light emitted from the first light guide unit and the second light guide unit, respectively. An illumination device configured to be incident on a light member .   The lighting device according to claim 1, wherein the second light is any one of light including a yellow wavelength component and light including a green wavelength component and a red wavelength component.   The lighting device according to claim 1, wherein the first light source is disposed in proximity to the first light guide member.   The lighting device according to any one of claims 1 to 3, wherein the second light source is disposed in proximity to the second light guide member.   The lighting device according to any one of claims 1 to 4, wherein the first light guide member and the second light guide member are connected on one surface.   Of the surfaces surrounding the light guide path of the first light guide member and the connection portion between the first light guide member and the second light guide member, the surfaces other than the surface on which the first light is incident The reflection part which reflects any one of said 1st wavelength component and said 2nd wavelength component was provided in at least one part, Preferably it is all, The any one of Claims 1-5 characterized by the above-mentioned. Lighting equipment.   The first light guide member includes a wavelength selection member that transmits the first light and reflects the second light on a surface on which the first light is incident. The illuminating device as described in any one of 1-6.   The lighting device according to any one of claims 1 to 7, wherein the first light source and the second light source are blue solid light sources. The lighting device according to any one of claims 1 to 8, wherein the first light source and the second light source are configured to be changeable to a desired light emission amount.   A wavelength selection member that transmits the second light and reflects the first light and the third light is provided at a connection portion between the first light guide member and the second light guide member. The illumination device according to any one of claims 1 to 9, wherein   A third light source that emits fourth light having a fourth wavelength component different from that of the first light source and the second light source, and the third light source is close to the second light guide member The illuminating device according to claim 1, wherein the illuminating device is arranged. In proximity to the second light guide portion, the lighting device according to any one of claims 1 to 11, wherein the fourth light source is characterized in that it is placed. The illumination device according to any one of claims 1 to 12, wherein a wavelength selection member is provided at a joint portion between the first light guide portion and the second light guide portion. Each light source, the lighting device according to any one of claims 1 to 13, characterized in that it is configured to be changed to a desired light emission amount.   An image projection apparatus comprising the illumination device according to claim 1.   The image projection device according to claim 15, further comprising a control unit that controls a light emission amount of each light source of the illumination device and a light emission order and combination of the light sources.   17. The image according to claim 15, comprising: an image generation unit irradiated with illumination light emitted from the illumination device; and a projection optical system that projects an image modulated by the image generation unit. Projection device.   The color component selection member that extracts a plurality of lights having different wavelength components from the illumination light in a time division manner and guides them to the image generation unit between the illumination device and the image generation unit. The image projection device according to 17.   The color component selection member has a color selection region for selecting and extracting light of a predetermined wavelength component from the illumination light, and a transmission region for transmitting the illumination light, and each region is in the optical path of the illumination light. Each light source of the illumination device is configured to be sequentially arranged in a time-sharing manner, and when the transmission region is arranged in the optical path of the illumination light, according to the color of the image generated by the image generation unit The image projection apparatus according to claim 18, further comprising a control unit that changes a light emission order and a combination thereof.   The illumination device is configured to emit yellow light, blue light, and combined light of the yellow light and the blue light as the illumination light, and the color selection region extracts red light from the yellow light. A first color selection area; and a second color selection area for extracting green light from the yellow light. The first color selection area or the second color selection area is arranged in the optical path of the illumination light. The control unit controls the light source of the illumination device to emit the yellow light, and when the transmission region is arranged in the optical path of the illumination light, the control unit The light emitting sequence and the combination of the light sources are changed according to the color of the image generated by the image generating unit, and control is performed so that any one of the yellow light, the blue light, and the combined light is emitted from the illumination device. 21. Image projection device as claimed.