JP2006018162A - Illuminating apparatus and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminating apparatus or the like capable of efficiently and satisfactorily illuminating liquid crystal light valves with illumination light emitted from an LED array without making a light source apparatus large in size. <P>SOLUTION: The projector 10 is individually provided with three primary colors illuminating apparatuses 21, 23 and 25 so as to individually illuminate the liquid crystal light valves 31, 33 and 35; then an image of high luminance can be projected by the effective utilization of the color illuminating apparatuses 21, 23 and 25. Also, in the projector 10, 2nd illumination light LG can be obtained, by guiding light source light SG1 of 1st green wavelength emitted from a 1st light source unit 23a and light source light SG2 of 2nd green wavelength emitted from a 2nd light source unit 24a by an optical coupling member 41 to the same optical path; and then the green liquid crystal light valve 33 can be illuminated efficiently. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an illumination device for illuminating a liquid crystal light valve and other display devices, and a projector incorporating such an illumination device.

As a so-called single-plate projector, there is one that illuminates a single liquid crystal light valve using RGB three-color LEDs (see Patent Document 1). In this projector, the R color LE
Light of each color from the D array, the G color LED array, and the B color LED array is guided to the same optical path by the cross dichroic prism, and illuminates one liquid crystal light valve arranged to face the exit surface of the cross dichroic prism. .

As a so-called three-plate projector, there is a projector in which a liquid crystal light valve is provided for each of the three colors RGB to secure the amount of light, and image light from each liquid crystal light valve is synthesized by a cross dichroic prism (see Patent Document 2). ). In this projector, a liquid crystal light valve for R light is illuminated by an R color LED array and a waveguide block, a liquid crystal light valve for G light is illuminated by a G LED array and a waveguide block, and a B color LED is illuminated. The liquid crystal light valve for B light is illuminated by the array and the waveguide block.
JP 2001-51651 A FIG. 5 of Japanese Patent Laid-Open No. 2000-112031

However, since the former projector illuminates a single liquid crystal light valve, the amount of image light is significantly smaller than a so-called three-plate projector, and a high-luminance image cannot be projected. . Further, since the LED arrays of the respective colors are arranged opposite to each other via the lens array or the collimator lens on the incident surface of the cross dichroic prism, the arrangement of the LED arrays of the respective colors is obtained from the etendue caused by the viewing angle of the liquid crystal light valve. There is a certain upper limit on the number. In particular, the G light that tends to have a shortage of light tends to be unable to efficiently illuminate the liquid crystal light valve with the illumination light from the LED array. Regarding the limitation on the number of arrayed LED arrays, there is a solution to widen the distance between the LED array or collimator lens and the liquid crystal light valve, but as a result, the problem arises that the size of the light source device increases at once. To do.

On the other hand, even in the latter projector, since the LED array is arranged facing the incident surface of the waveguide block, there is a limitation in the area of the number of LEDs constituting the LED array, and in particular, the amount of G light is likely to be insufficient. . As in the case of the former projector, it is possible to reduce the cross-sectional area of the light source light using a lens array or a collimator lens. However, due to the above-mentioned etendue relationship, the LED array or collimator and the liquid crystal light valve There is a problem in that it is necessary to widen the interval, and as a result, the light source device increases in size at a stroke.

Accordingly, the present invention provides an illumination device that can efficiently illuminate a liquid crystal light valve with a sufficient amount of light by illumination light from an LED array without almost increasing the size of the light source device, and a projector incorporating such an illumination device. The purpose is to do.

In order to solve the above problems, an illumination device according to the present invention includes: (a) a plurality of light sources that individually generate light sources having different wavelengths within a wavelength range corresponding to a predetermined single color;
(B) An optical coupling member that emits combined light obtained by combining light sources having a plurality of wavelengths from a plurality of light sources and guiding them to the same optical path as illumination light. In addition, the above optical coupling member carries out the optical coupling of the light source light of several wavelengths from a several light source using the difference of those wavelengths, and guides it to the same optical path.

In the illuminating device, since the optical coupling member emits combined light obtained by combining multiple light sources from a plurality of light sources and guiding them to the same optical path as the illumination light, a plurality of light sources of the same color are the same. When the illumination light is obtained by arranging the light paths so as not to block each other, the same effect can be achieved. Therefore, compared with the case where the angle range of the light source light from a plurality of light sources is adjusted depending on the arrangement of the light source, the lens, etc., the target such as the liquid crystal light valve can be efficiently illuminated, The lighting device can be easily downsized. As a specific example, in the case where a predetermined single color light source is composed of a plurality of light emitting elements that are two-dimensionally arranged, for example, such a restriction is imposed even if the number of light emitting elements is limited in relation to etendue. Since the light source light from the light emitting elements exceeding the number can be guided to the same optical path as the light emitting elements within the limited number through the optical coupling member, the liquid crystal can be efficiently and sufficiently lightened while limiting the enlargement of the light source device. An object such as a light bulb can be illuminated.

In another specific aspect of the present invention, the optical coupling member includes a dichroic filter whose number is one less than the number of the plurality of light sources, and superimposes the light sources having a plurality of wavelengths from the plurality of light sources, and has the same optical path. Lead to. In this case, the light sources from a plurality of light sources can be easily combined with little loss.

In another specific aspect of the present invention, each of the plurality of light sources has a solid-state light emitting element.
In this case, light source light with high efficiency and high luminance can be obtained by using a small and highly stable solid state light emitting device.

In another specific aspect of the present invention, the plurality of light sources each include a plurality of solid state light emitting devices arranged two-dimensionally. In this case, each light source corresponding to a predetermined single color is constituted by a plurality of solid light emitting elements arranged in parallel, but the solid light emitting elements can prevent the area of the light source from becoming larger than necessary.

In another specific aspect of the present invention, each of the plurality of light sources has a lens array including a plurality of lens elements (lens elements) facing the plurality of solid state light emitting elements. In this case, light source light from each solid-state light emitting element can be efficiently collected by each lens element and guided to the optical coupling member, and an object such as a liquid crystal light valve can be efficiently illuminated.

In another specific aspect of the present invention, a light source that generates light of at least one color different from a predetermined single color as illumination light is further provided. In this case, an illumination device that generates illumination light of a plurality of colors can be provided.

In another specific aspect of the invention, the predetermined single color corresponds to one primary color among the three primary colors, and at least one color different from the predetermined single color corresponds to the remaining two primary colors of the three primary colors. . In this case, it is possible to provide an illumination device that individually generates illumination light of the three primary colors.

In another specific aspect of the present invention, the predetermined single color is G among the three primary colors of RGB, and at least one color different from the predetermined single color is R light and B light among the three primary colors of RGB. is there. In this case, it is possible to superimpose a plurality of light sources using an optical coupling member for G light, which often requires a larger amount of light than other colors to achieve white balance. A sufficient amount of light can be secured.

The projector according to the present invention includes (a) the above-described illumination device, (b) illumination light of a predetermined single color emitted from the optical coupling member, and illumination light of at least one color different from the predetermined single color. And each color light modulation device that modulates each color illumination light to form each color modulation light, and (c) a light synthesis member that synthesizes each color modulation light that has passed through each color light modulation device. And (d) a projection optical system that forms a projection image of the image light synthesized by passing through the light synthesis member.

The projector includes the above-described illumination device, and can illuminate the light modulation device of each color with high luminance by the light source light having sufficient luminance from the light source of each color provided in the illumination device. Further, according to the projector, the combined light obtained by the light coupling member combining light sources of a plurality of wavelengths from a plurality of light sources of a predetermined single color and guiding them to the same optical path as the illumination light of the predetermined single color. Since the light is emitted, it is possible to efficiently illuminate a predetermined single color light modulation device, and it is possible to easily reduce the size of the illumination device and the projector.

FIG. 1 is a block diagram conceptually illustrating the structure of the projector according to the first embodiment of the invention. The projector 10 includes an illumination device 20, a light modulation device 30, and a projection lens 4.
0 and a control device 50. Here, the illumination device 20 includes a B light illumination device 21, a G light illumination device 23, an R light illumination device 25, and a light source driving device 27. Further, the light modulation device 3
0 denotes three liquid crystal light valves 31, 33, and 35 that modulate illumination light according to image information, a cross dichroic prism 37 for image composition, and each liquid crystal light valve 31, 33,
35 has an element driving device 38 for outputting a driving signal.

The B light illuminating device 21 includes a light source unit 21 a that generates B color light source light, and a light source unit 2.
And a condensing lens array 21b that appropriately condenses the light source light from 1a. The former light source unit 21a includes a plurality of LEDs 21f that are solid-state light emitting elements also called solid-state light sources. These LEDs 21f are arranged on a circuit board 21g extending in a plane perpendicular to the optical axis, for example, in a matrix arrangement or the like. It is attached in a two-dimensional array. Each LED 21f is an off-the-shelf product whose size is standardized, and each generates light source light having the same wavelength included in the category of B color (blue) among the three primary colors. The latter condenser lens array 21b is composed of a plurality of beam shaping lens elements 21h arranged two-dimensionally facing the front of each LED 21f, and each lens element 21h is a B color emitted from each LED 21f. The light source light is collimated or emitted in a desired direction while diverging at an appropriate angle.

In the B light illumination device 21 described above, the B light source light from the light source unit 21 a is collected without waste by the condenser lens array 21 b and is made uniform in the liquid crystal light valve 31 for B light in the light modulation device 30. Incident as first illumination light LB.

Although not shown in the drawing, a fly-eye lens, a rod integrator, or the like can be arranged between the condenser lens array 21b and the liquid crystal light valve 31, and in this case, the first
The illumination light LB can be further uniformized by wavefront division and superposition and can be incident on the irradiated region on the liquid crystal light valve 31. Further, for example, a polarization conversion element can be arranged between the light source unit 21a and the condenser lens array 21b. In this case, the liquid crystal light valve 3
The first illumination light LB having a polarization plane suitable for modulation at 1 can be made incident on the liquid crystal light valve 31.

The G light illuminator 23 includes first and second light source units 23a that both generate G light source light.
24a, the first and second condenser lens arrays 23b and 24b for condensing the light source light from both the light source units 23a and 24a, and the light source light from the first and second light source units 23a and 24a, respectively. And an optical coupling member 41 guided to the same optical path.

The first light source unit 23a is composed of a plurality of LEDs 23f.
It is mounted in a suitable two-dimensional array on a circuit board 23g extending in a plane perpendicular to the optical axis. Each LED 23f is an off-the-shelf product whose size is standardized, and generates light source light SG1 having a first green wavelength (for example, 536 nm to 550 nm) included in the category of G color (green) among the three primary colors. The second light source unit 24a is also composed of a plurality of LEDs 24f.
The ED 24f is mounted in a suitable two-dimensional array on a circuit board 24g extending in a plane perpendicular to the optical axis. Each LED 24f has the same shape and structure as the LED 23f described above, but the second green wavelength (for example, 520n) shorter than the LED 23f among the light included in the category of G color.
m to 535 nm) of source light SG2.

The first condenser lens array 23b includes each LED 23 incorporated in the first light source unit 23a.
A plurality of beam shaping lens elements 23h arranged two-dimensionally facing the front of f
Each lens element 23h collimates the light source light SG1 emitted from each LED 23f or emits it in a desired direction while diverging at an appropriate angle. Similarly, the second condenser lens array 24b also includes a plurality of beam shaping lens elements 24h arranged two-dimensionally facing the front surface of each LED 24f incorporated in the second light source unit 24a. The element 24h collimates or emits the light source light SG2 emitted from each LED 24f in a desired direction while diverging at an appropriate angle.

The optical coupling member 41 is a dichroic prism and incorporates a dielectric multilayer film 41a as a dichroic filter that transmits the light source light SG1 and reflects the light source light SG2. That is, the optical coupling member 41 transmits and straightens the first green wavelength light source light SG1 from the first light source unit 23a that has emitted the first condenser lens array 23b, and emits the second condenser lens array 24b. The second green wavelength light source light SG2 from the second light source unit 24a is reflected and deflected, and both light source lights SG1 and SG2 are emitted in the same direction.

In the G light illuminating device 25 described above, the G color light SG1 from the first light source unit 23a is recovered without waste by the first condenser lens array 23b and enters the optical coupling member 41, and the G color light from the second light source unit 24a. SG2 is collected without waste by the second condenser lens array 24b and enters the optical coupling member 41. Both G color lights SG1 and SG2 incident on the optical coupling member 41
Are superimposed by using the transmission / reflection characteristics of the dielectric multilayer film 41a, and enter the liquid crystal light valve 33 for G light in the light modulator 30 as the second illumination light LG that is made uniform. At this time, in the above-described optical coupling member 41, the pair of light source light from both the light source units 23a and 24a can be overlapped with little loss and guided to the same optical path, so that the amount of light obtained by the first light source unit 23a alone can be reduced. It is possible to obtain bright second illumination light LG that easily exceeds the space-saving.

Although not shown in the drawing, a fly-eye lens, a rod integrator, or the like can be disposed between the optical coupling member 41 and the liquid crystal light valve 33. In this case, the second illumination light L
G can be made more uniform by wavefront division and superposition and can be incident on the irradiated region on the liquid crystal light valve 33. Further, for example, the first light source unit 23a and the condenser lens array 23 are used.
b, or between the second light source unit 24a and the condenser lens array 24b, a polarization conversion element can be arranged. In this case, a polarization plane suitable for modulation by the liquid crystal light valve 33 is set. The second illumination light LG can be incident on the liquid crystal light valve 33.

FIG. 2 is a graph for explaining a specific production example of the G light illumination device 25. As is apparent from the graph, the LED 23f used for the first light source unit 23a has a wavelength of 544 nm.
The LED 24f used for the second light source unit 24a is the one having the emission peak at a wavelength of 523 nm (the one-dot chain line in the graph). In addition, as the dielectric multilayer film 41a used for the optical coupling member 41, a low-pass filter (broken line in the graph) having a half-value wavelength of 532 nm is used. Both LEDs 23f
, 24f are synthesized by the optical coupling member 41, and the spectral characteristic is the wavelength 518 as shown by the solid line.
It has a maximum first peak at nm and a shoulder-like second peak at a wavelength of 546 nm, and the total amount of light is a relatively efficient addition of the first peak and the second peak. It has become.

図１に戻って、Ｒ光照明装置２５は、Ｒ色の光源光を発生する光源ユニット２５ａと、
光源ユニット２５ａからの光源光を適宜集光する集光レンズアレイ２５ｂとを備える。前
者の光源ユニット２５ａは、複数のＬＥＤ２５ｆからなり、これらのＬＥＤ２５ｆは、光
軸に垂直な面内に延在する回路基板２５ｇ上に適当な２次元配列で取り付けられている。
各ＬＥＤ２５ｆは、サイズが規格化された既製品であり、３原色のうちＲ色（赤色）の範
疇に含まれる同一波長の光源光をそれぞれ発生する。後者の集光レンズアレイ２５ｂは、
各ＬＥＤ２５ｆの正面に対向して２次元的に配置された複数のビーム整形用のレンズエレ
メント２５ｈからなり、各レンズエレメント２５ｈは、各ＬＥＤ２５ｆから射出されたＲ
色の光源光をコリメートし或いは適当な角度で発散させつつ所望の方向に射出させる。 Table 1 below shows the measured values of illuminance of the pair of LEDs 23f and 24f shown in the graph of FIG. 2, the single lumen converted value of one LED 24f, and the combined lumen converted value of both LEDs 23f and 24f. Comparing a pair of lumen converted values in Table 1, it can be seen that the brightness of the G color illumination light is about 1.33 times that of a single case by synthesis.

Returning to FIG. 1, the R light illuminator 25 includes a light source unit 25 a that generates R light source light,
A condensing lens array 25b that appropriately condenses light from the light source unit 25a. The former light source unit 25a is composed of a plurality of LEDs 25f, and these LEDs 25f are mounted in a suitable two-dimensional array on a circuit board 25g extending in a plane perpendicular to the optical axis.
Each LED 25f is an off-the-shelf product whose size is standardized, and generates light sources having the same wavelength included in the R color (red) category of the three primary colors. The latter condenser lens array 25b is
Each of the LED elements 25h includes a plurality of beam shaping lens elements 25h that are two-dimensionally arranged to face the front surface of each LED 25f, and each lens element 25h is an R that is emitted from each LED 25f.
Color light source light is collimated or emitted in a desired direction while diverging at an appropriate angle.

In the R light illuminating device 25 described above, the R color light source light from the light source unit 25a is collected without waste by the condenser lens array 25b, and is made uniform in the liquid crystal light valve 35 for R light in the light modulation device 30. Incident as third illumination light LR.

Although not shown in the drawing, a fly-eye lens, a rod integrator, or the like can be arranged between the condenser lens array 25b and the liquid crystal light valve 35.
The illumination light LR can be further uniformized by wavefront division and superposition and can be incident on the irradiated region on the liquid crystal light valve 35. In addition, for example, a polarization conversion element can be arranged between the light source unit 25a and the condenser lens array 25b. In this case, the liquid crystal light valve 3
The third illumination light LR having a polarization plane suitable for modulation at 5 can be incident on the liquid crystal light valve 35.

The light modulation device 30 sandwiches the three liquid crystal light valves 31, 33, and 35 into which the first, second, and third illumination lights LB, LG, and LR are incident and the liquid crystal light valves 31, 33, and 35, respectively. Are provided with three sets of polarizing filters 36a, 36b, 36c. The first illumination light LB from the B light illumination device 21 is incident on the surface to be irradiated, that is, the screen of the liquid crystal light valve 31. Further, the second illumination light LG from the G light illuminating device 23 is incident on the illuminated surface of the liquid crystal light valve 33, that is, the screen. Further, the third illumination light LR from the R light illumination device 25 is incident on the illuminated surface of the liquid crystal light valve 35, that is, the screen. Each liquid crystal light valve 31, 33, 35
Is a non-light-emitting light modulation device for modulating the spatial intensity distribution of the incident illumination light LB, LG, LR, and the three colors of light incident on the liquid crystal light valves 31, 33, 35, respectively, The polarization state is adjusted in units of pixels in accordance with drive signals or image signals input as electrical signals to the liquid crystal light valves 31, 33, and 35. At that time, each of the liquid crystal light valves 31, 33, 3 is set by a pair of polarizing filters 36a, 36b, 36c arranged on the incident side and the emission side.
The polarization direction of the illumination light incident on 5 is adjusted, and the liquid crystal light valves 31, 33,
Only the modulated light having a predetermined polarization direction is extracted from the light emitted from 35.

The cross dichroic prism 37 is a photosynthetic member, and incorporates a dielectric multilayer film 37a for reflecting B light and a dielectric multilayer film 37b for reflecting R light in an orthogonal state. The R light is reflected by the dielectric multilayer film 37a and emitted to the left in the traveling direction, and the G light from the liquid crystal light valve 33 is caused to travel straight through the dielectric multilayer films 37a and 37b to be emitted from the liquid crystal light valve 35. The R light is reflected by the dielectric multilayer film 37b and emitted to the right in the traveling direction. Thus, the synthesized light synthesized by the cross dichroic prism 37 is
The light enters the projection lens 40 that is a projection optical system as color image light.

The control device 50 outputs a control signal to the light source driving device 27 so that the respective color illumination devices 21, 23, 23 are output.
LED 21f constituting the light source unit 21a, 23a, 24a, 25a provided in 25,
23f, 24f, and 24f are caused to emit light at an appropriate timing. Further, the control device 50 outputs a control signal to the element driving device 38 to form a two-dimensional polarization characteristic distribution corresponding to the brightness of the projected image on each of the liquid crystal light valves 31, 33 and 35.

Hereinafter, the operation of the projector 10 shown in FIG. 1 will be described. B provided in the lighting device 20
The illumination lights LB, LG, LR of the respective colors from the GR color illumination devices 21, 23, 25 enter the corresponding liquid crystal light valves 31, 33, 35, respectively. Each liquid crystal light valve 31, 33, 3
Reference numeral 5 denotes a two-dimensional distribution of optical characteristics that is driven by an element driving device 38 that operates according to an image signal from the outside, and modulates illumination light of each color two-dimensionally in pixel units. As described above, the illumination light, that is, the image light modulated by the liquid crystal light valves 31, 33, and 35 is synthesized by the cross dichroic prism 37, enters the projection lens 40, and is projected onto a screen (not shown). In this case, the projector 10 has three primary color lighting devices 21, 23, 23.
25, and each color illumination device 21, 23, 25 is provided with each liquid crystal light valve 31, 33, 3
5 is individually illuminated, it is possible to project a high-luminance image by using the color illumination devices 21, 23, 25 in parallel. In the projector 10, the optical coupling member 41 is
Since the second illumination light LG is obtained by guiding the first green wavelength light source light SG1 from the first light source unit 23a and the second green wavelength light source light SG2 from the second light source unit 24a to the same optical path. The G liquid crystal light valve 33 that tends to be insufficient can be efficiently illuminated, and the target white balance can be easily achieved. At this time, the light coupling member 41 is inserted into the optical path and the second light source unit 24a is disposed so as to face the side surface of the light coupling member 41. Thus, the above-described optical coupling is performed. The projector 10 can be easily downsized.

In the first embodiment described above, in the G light illumination device 23, the G color light SG <b> 1 from the first light source unit 23 a and the G color light SG <b> 2 from the second condenser lens array 24 b are superimposed by the optical coupling member 41. The second illumination light LG having a relatively increased intensity is obtained, but the remaining B light illumination device 21 and R light illumination device 25 are also provided with a plurality of light source units to optically couple the light source light from these light source units. The members can be combined in the same manner, and R-color illumination light and B-color illumination light with a relatively increased amount of light can be obtained.

In the first embodiment described above, the two light source units 23 are used in the G light illumination device 25.
a, 24b are incorporated, but the optical coupling member 41 is a cross dichroic mirror,
If the cutoff wavelength of the cross dichroic mirror is appropriately set to a different wavelength that approximates, the light source light from the three light source units can be superimposed with relatively low loss, and the amount of light such as G color illumination light is further increased. be able to.

[Second Embodiment]
FIG. 3 is a diagram illustrating the structure of the projector according to the second embodiment. The projector according to the second embodiment is obtained by changing the projector according to the first embodiment with respect to the G light illuminating device 23, and the same portions are denoted by the same reference numerals, and redundant description is omitted.

In the G light illumination device 123 of the second embodiment, the optical coupling member 41 in FIG. 1 is replaced with a dichroic mirror 141. The dichroic mirror 141 includes the dielectric multilayer film 4 shown in FIG.
A dielectric multilayer film corresponding to 1a is provided. The first green wavelength light source light SG1 from the first light source unit 23a passes through the dichroic mirror 141 and travels straight. Second light source unit 24a
The second green wavelength light source light SG2 is bent by the dichroic mirror 141 and emitted in the same direction as the light source light SG1. That is, the dichroic mirror 141 allows the pair of light source lights SG1 and SG2 from the pair of light source units 23a and 24a to be superimposed and emitted to the same optical path, thereby obtaining the second illumination light LG having a relatively large light amount.

In the above second embodiment, in the G light illumination device 123, the two light source units 23a,
Although the light source light from 24b is superimposed, if a plurality of dichroic mirrors 141 are arranged on the optical path and the cutoff wavelengths of these dichroic mirrors are set appropriately, the light source light from three or more light source units is relatively low. It is also possible to superimpose with loss, and the amount of light such as G color illumination light can be further increased.

[Third Embodiment]
Hereinafter, a projector according to a third embodiment of the invention will be described. The projector according to the third embodiment is a modification of the first embodiment. As shown in FIG. 4, in the projector 210, the illumination device 220 includes a cross dichroic prism 237 in addition to the light illumination devices 21, 23, and 24 for each color. Also, a single plate type liquid crystal light valve 230 is illuminated by the illumination device 220. The liquid crystal light valve 230 is sandwiched between a pair of polarizing filters 36d and 36d.

The cross dichroic prism 237 incorporates a dielectric multilayer film 237a for reflecting B light and a dielectric multilayer film 237b for reflecting R light in an orthogonal state. One dielectric multilayer film 237a is a dichroic filter that reflects B-color light, and the other dielectric multilayer film 273b is a dichroic mirror that reflects R-color light.

The first illumination light LB from the B light illumination device 21 is reflected by the dielectric multilayer film 237a of the cross dichroic prism 237, and the second illumination light LG from the G light illumination device 23 is both dielectric multilayer films 237a and 237b. , And the third illumination light LR from the R light illumination device 25 is reflected by the dielectric multilayer film 237b. From this, the first to the light illumination devices 21, 23, 24 of each color
The third illumination light LB, LG, LR can be superimposed to obtain high-intensity illumination light, and the single-plate liquid crystal light valve 230 can be turned into white illumination light or illumination light of each color that is turned on in time series. L
Illumination can be performed by B, LG, and LR.

According to the projector 210 described above, in the G light illuminating device 23 that particularly requires a light amount, the pair of light source lights SG1 from the pair of light source units 23a and 24a by the optical coupling member 41.
SG2 are guided to the same optical path to obtain the second illumination light LG, so that the relative intensity of the G color can be increased to achieve a desired white balance.

[Fourth Embodiment]
FIG. 5 is a diagram illustrating the structure of the projector according to the fourth embodiment. The projector 310 includes an illumination device 220, a condenser lens 316a, a rod integrator 316b, a superimposing lens 318, a reflection mirror 351, a field lens 352, and a digital micromirror device (similar to the third embodiment. DMD) 353 and projection lens 354
Are arranged in order along the system optical axis SA.

From the illumination device 220, RGB light source lights are emitted as illumination light at different timings in time series. The illumination light of each color emitted from the illumination device 220 is incident on the DMD 353 via the condenser lens 316a, the rod integrator 316b, the field lens 352, and the like, and uniform illumination of the DMD 353 is achieved. The DMD 353 is a reflection direction control type spatial light modulator, and the direction of the projection lens 354 is reflected by reflecting the incident illumination light on a micromirror corresponding to each pixel according to a given image signal. Has a function of emitting image light representing an image. The image light emitted from the DMD 353 is a field lens 35.
2 and a projection lens 354, and is projected onto a screen (not shown). The image projected in this manner has a sufficient amount of light for the G color and has an excellent image quality.

As described above, the present invention has been described according to the embodiment, but the present invention is not limited to the above embodiment. For example, an organic EL element or an inorganic EL element can be incorporated in place of the LEDs 21f, 23f, 24f, and 25f shown in FIG.

It is a figure explaining the projector of 1st Embodiment. It is a graph explaining the synthesis | combination of several light source light in G light illumination apparatus. It is a figure explaining the principal part of the projector of 2nd Embodiment. It is a figure explaining the projector of 3rd Embodiment. It is a figure explaining the projector of 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Projector, 20 ... Illuminating device, 21, 23, 25 ... Each color light illuminating device, 2
1a, 23a, 24a, 25a ... Light source unit, 21b, 23b, 24b, 25b ... Condensing lens array, 21f, 23f, 24f, 24f ... LED, 21h, 23h, 24
h, 25h ... lens element, 27 ... light source driving device, 30 ... light modulation device, 31,
33, 35 ... Liquid crystal light valves for each color, 37 ... Cross dichroic prism, 38
, Element driving device, 40, projection lens, 41, optical coupling member, 41a, dielectric multilayer film,
50 ... Control device

Claims (9)

A plurality of light sources that individually generate light sources having different wavelengths within a wavelength range corresponding to a predetermined single color, and
An illuminating device comprising: an optical coupling member that emits combined light obtained by combining and guiding the light sources of the plurality of wavelengths from the plurality of light sources to the same optical path. The optical coupling member includes a number of dichroic filters that is one less than the number of the plurality of light sources, and superimposes the light sources of the plurality of wavelengths from the plurality of light sources to the same optical path. Item 2. The lighting device according to Item 1. The lighting device according to claim 1, wherein each of the plurality of light sources includes a solid light emitting element. The lighting device according to claim 3, wherein each of the plurality of light sources includes a plurality of solid-state light emitting elements arranged two-dimensionally. The lighting device according to claim 4, wherein each of the plurality of light sources includes a lens array including a plurality of lens elements facing the plurality of solid state light emitting elements. The illumination device according to any one of claims 1 to 5, further comprising a light source that generates light of at least one color different from the predetermined single color as illumination light. 7. The predetermined single color corresponds to one primary color among the three primary colors, and at least one color different from the predetermined single color corresponds to the remaining two primary colors of the three primary colors. Lighting device. 8. The predetermined single color is G color among the three primary colors of RGB, and at least one color different from the predetermined single color is R light and B light of the three primary colors of RGB. Lighting equipment. The lighting device according to any one of claims 6 to 8,
Illumination is performed by the illumination light of the predetermined single color emitted from the optical coupling member and the illumination light of at least one color different from the predetermined single color, and the illumination light of each color is modulated, respectively. A light modulator for each color that forms modulated light; and
A light synthesizing member that synthesizes the modulated light of each color via the light modulation device of each color;
A projector comprising: a projection optical system that forms a projection image of image light synthesized by passing through the light synthesis member.

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