JP6512762B2 - Lighting device and image display device using the same - Google Patents

Description

  The present invention relates to a lighting device and an image display device such as a projector using the same.

  In recent years, a projector capable of displaying a color image using a phosphor that converts part of blue light from an LD (laser diode) light source into green light and red light has been developed. A configuration described in Patent Document 1 is known as such a projector.

  Patent Document 1 discloses a technique for displaying a color image using an LD light source that emits linearly polarized blue light and a phosphor that converts part of the blue light into green light and red light.

JP, 2012-4009, A

  The phosphor described in the above-mentioned Patent Document 1 emits yellow light using blue light as excitation light, but in such a phosphor, red light tends to be scarce than green light. Therefore, when displaying a white image, the light amount of green light and blue light is reduced according to the red light with the smallest light amount among red light, green light and blue light, or the maximum modulation amount in the liquid crystal panel is It is necessary to reduce to red light. In other words, a part of the green light and the blue light is not used as light projected onto the screen, and is lost. That is, in the configuration described in Patent Document 1, there is a possibility that the light utilization efficiency may be reduced.

  Therefore, an object of the present invention is to provide a lighting device with higher light utilization efficiency and an image display device using the same.

In order to achieve the above object, the lighting device of the present invention is
A first light source for emitting a blue luminous flux;
A second light source for emitting a red light beam and a blue light beam;
A wavelength conversion element that converts a light flux from the first light source into a converted light flux that differs in wavelength from the light flux from the first light source, and emits the converted light flux;
A first optical element that transmits one of light flux from the second light source and light flux of a first wavelength band included in the converted light flux and reflects the other;
A second optical element for guiding a light flux in a second wavelength band included in the converted light flux to a surface to be illuminated for green light and guiding the light flux from the second light source in a direction different from the light flux in the second wavelength band; A lighting device comprising
The blue light flux from the first light source is incident on the first optical element from a first direction,
The red light flux from the second light source and the blue light flux from the second light source are incident on the first optical element from a second direction different from the first direction,
The first wavelength band includes the second wavelength band.

  According to the present invention, it is possible to provide a lighting device with higher light utilization efficiency and an image display device using the same.

Structure explanatory drawing of the image display apparatus which mounts the illuminating device shown by 1st Example of this invention Structure explanatory drawing of the light source used with the illuminating device shown in 1st Example of this invention Spectral transmission characteristics of optical elements used in the lighting apparatus shown in the first embodiment of the present invention Structure explanatory drawing of the wavelength conversion element used with the illuminating device shown in 1st Example of this invention Emission spectrum characteristics of the wavelength conversion element used in the lighting apparatus shown in the first embodiment of the present invention Spectral characteristics of screen surface in the first embodiment of the present invention Explanatory drawing of screen surface chromaticity in 1st Example of this invention Structure explanatory drawing of the image display apparatus carrying the illuminating device shown in 2nd Example of this invention Spectral transmission characteristics of the optical element used in the lighting apparatus shown in the second embodiment of the present invention Structure explanatory drawing of the wavelength conversion element used with the illuminating device shown by 2nd Example of this invention

  Hereinafter, preferred embodiments of the present invention will be exemplarily described with reference to the drawings. However, the relative arrangement and the like of the component parts described in this embodiment should be appropriately changed depending on the configuration of the apparatus to which the present invention is applied and various conditions. That is, relative positions and the like of the component parts are not defined in order to limit the scope of the present invention to the following embodiments.

First Embodiment
The configuration of the lighting apparatus according to the first embodiment of the present invention will be described using FIGS. 1 to 7.

  FIG. 1 is a view showing a configuration of a lighting device in the present embodiment. The illumination apparatus in the present embodiment includes a first LD group 1, a second LD group 5, a fluorescent member 13, a first dichroic mirror 9, and a second dichroic mirror 20.

  Reference numeral 1 denotes a first LD group configured of a plurality of blue LDs (laser diodes) capable of emitting blue light. The light flux from the first LD group 1 is converted into a substantially parallel light flux by the collimator lens group 2 and is compressed to the first dichroic mirror 9 by the compression lenses 3 and 4 that thinly compress the light flux from the collimator lens group 2 Led. The lens 3 is a convex lens of positive refractive power, and the lens 4 is a concave lens of negative refractive power.

  Reference numeral 5 denotes a second LD group including a plurality of red LDs capable of emitting red light, and as shown in FIG. 2, the second LD group is arranged in the order of blue LDB1, red LDR1, blue LDB2, and red LDR2. In other words, blue LDs and red LDs are alternately arranged. The light flux from the second LD group 5 is converted into a substantially parallel light flux by the collimator lens group 6, and the compression lenses 7 and 8 thinly compress the light flux from the collimator lens group 6 to the first dichroic mirror 9. Led. The lens 7 is a convex lens of positive refractive power, and the lens 8 is a concave lens of negative refractive power.

  The central wavelength of the light flux from the blue LD in the first LD group 1 and the second LD group 5 is around 440 nm, and the central wavelength of the red LD in the second LD group 5 is around 640 nm.

  FIG. 3 is a diagram showing the characteristics of the first dichroic mirror 9 and a second dichroic mirror 20 described later. As shown in FIG. 3, the first dichroic mirror 9 transmits a light beam having a wavelength of 450 nm or less, or 630 nm or more, in order to transmit the light beams from the first LD group 1 and the second LD group 5. Is configured as. Conversely, the first dichroic mirror 9 is configured to reflect a light beam having a wavelength of 450 nm or more and 630 nm or less.

  More preferably, the cut wavelength on the short wavelength side of the first dichroic mirror 9 is 460 nm, and the cut wavelength on the long wavelength side is 622 nm. Here, the cut wavelength is a wavelength of a light flux at which the transmittance of the optical element is 50%, in other words, a wavelength at which the transmittance is a half value.

  For this reason, the light flux from the first LD group 1 having a central wavelength near 440 nm is transmitted through the first dichroic mirror 9 and condensed on the surface of the fluorescent member 13 by the condensing lenses 10, 11 and 12. You will be guided to

  FIG. 4 is a view showing the configuration of the fluorescent member (wavelength conversion element) 13. As shown in FIG. 4, the fluorescent member 13 includes a mirror (substrate) 60 and a phosphor 29 provided on the mirror 60. In addition, while the light flux from the first LD group 1 is condensed at a predetermined position on the mirror 60 by the above-described condensing lenses 10, 11, 12, the fluorescent member 13 has a circular shape by a motor (not shown). The mirror 60 rotates about its center. Therefore, the light flux from the first LD group 1 continuously illuminates on a predetermined circumference on the mirror 60 (on the circumference whose center of rotation is the center of the mirror 60).

  The characteristics of the phosphor 29 are shown in FIG. The phosphor 29 has a characteristic of emitting a luminous flux (converted luminous flux) including green light, using the blue light from the first LD group 1 as excitation light. Specifically, as shown in FIG. 5, the phosphor 29 emits light in a wide wavelength band from 460 nm to 700 nm with a center wavelength of about 540 nm. The converted luminous flux emitted from the phosphor 29 is emitted without defining the direction. Therefore, a part of the converted light flux is reflected by the mirror 60, and the others are emitted from the phosphor 29 without passing through the mirror 60. The converted light flux emitted from the phosphor 29 is guided to the first dichroic mirror 9 by the condensing lenses 10, 11 and 12. In other words, the fluorescent member 13 is configured to convert the luminous flux from the first LD group 1 into a converted luminous flux whose wavelength is different from that of the luminous flux from the first LD group 1 and to emit the converted luminous flux . Since the phosphor 29 has a diffusing action, it is desirable that the condenser lenses 10, 11 and 12 have a high numerical aperture (NA) in order to use the light from the phosphor 29 with little loss. .

Here, the numerical aperture (NA) referred to here is the maximum incidence angle θ of the converted luminous flux emitted from the phosphor 29 to the condensing lenses 10, 11, 12. The refractive index of the medium between 12 is n. At this time, the numerical aperture (NA) is defined by the following equation (1).
NA = nsinθ (1)

  As described above, the first dichroic mirror 9 is configured to transmit a light beam having a wavelength of 450 nm or less, or 630 nm or more. With this configuration, it is possible to reflect most of the light flux from the fluorescent member 13 while transmitting the light flux from the first LD group 1 and the second LD group 5.

The converted light flux from the fluorescent member 13 is reflected by the first dichroic mirror 9 and is guided to the second dichroic mirror 20 described later. On the other hand, the blue light and the red light from the second LD group 5 are transmitted through the first dichroic mirror 9 and guided to the second dichroic mirror 20. In other words, the first dichroic mirror 9 is configured to transmit one of the light flux from the second LD group 5 and the light flux of the first wavelength band included in the converted light flux and reflect the other. ing. Here, the light flux in the first wavelength band is a light flux in the visible light band having a wavelength of λ _S or more and λ _L or less, and in the present embodiment, λ _S = 450 nm and λ _L = 630 nm. More preferably, λ _S = 460 nm and λ _L = 622 nm. That is, λ _S and λ _L are cut wavelengths on the short wavelength side and the long wavelength side of the first dichroic mirror 9 described above.

  A folding mirror 14 is provided between the first dichroic mirror 9 and the second dichroic mirror 20. Furthermore, between the folding mirror 14 and the second dichroic mirror 20, the first fly eye lens 15, the second fly eye lens 16, the polarization conversion element 17, the first condenser lens 18, the second condenser A lens 19 is provided. In the present embodiment, the illumination optical system includes the first fly eye lens 15, the second fly eye lens 16, the polarization conversion element 17, the first condenser lens 18, and the second condenser lens 19. ing.

  The folding mirror 14 reflects the light flux from the first dichroic mirror 9 so as to be guided to the second dichroic mirror 20.

  The light incident on the illumination optical system is divided into a plurality of partial light beams by the first fly eye lens 15, and is incident on the second fly eye lens 16. From the viewpoint of polarization separation performance, it is desirable that the incident angle range to the PBS (polarization beam splitter) 22 and 23 described later be as narrow as possible. For that purpose, the second fly eye lens 16 needs to be miniaturized. Therefore, the light beam is compressed between the first fly eye lens 15 and the second fly eye lens 16 to miniaturize the second fly eye lens 16. Specifically, the first fly's eye lens 15 is decentered to the center side of the fly's eye lens with respect to the lens cells in the peripheral part. On the other hand, the second fly's eye lens 16 is decentered on the outer peripheral side of the fly's eye lens with respect to the lens cells in the peripheral part.

  Generally, the light flux from the LD is linearly polarized light, but the light flux from the phosphor 29 is non-polarized light whose polarization direction is disturbed. Therefore, in order to efficiently perform polarization separation in PBSs 22 and 23 described later, the polarization conversion element 17 is provided to align the polarization directions in a predetermined direction.

  The light flux whose polarization direction is aligned by the polarization conversion element 17 is guided to the second dichroic mirror 20 by the first condenser lens 18 and the second condenser lens 19.

  Thus, the illumination optical system divides the light flux from the first dichroic mirror 9 into a plurality of partial light fluxes and guides the plurality of partial light fluxes to the second dichroic mirror 20.

  The second dichroic mirror 20 has characteristics different from that of the first dichroic mirror 9 as shown in FIG. Specifically, the second dichroic mirror 20 is configured to reflect light of 500 nm or less and light of 600 nm or more. More preferably, the second dichroic mirror 20 is preferably configured such that the cut wavelength on the short wavelength side is 510 nm and the cut wavelength on the long wavelength side is 585 nm.

  In other words, the second dichroic mirror 20 guides the light flux of the second wavelength band contained in the converted light flux to the liquid crystal panel 26 for green, and the light flux from the second LD group 5 is different from the light flux of the second wavelength band. Guide in the direction. At this time, the first wavelength band includes the second wavelength band.

Here, the second wavelength band is a luminous flux of a visible light band having a wavelength of λ _S ′ or more and λ _L ′ or less. In the present embodiment, λ _S ′ = 500 nm and λ _L ′ = 600 nm. More preferably, λ _S '= 510 nm and λ _L ' = 585 nm. That is, λ _S 'and λ _L ' are cut wavelengths on the short wavelength side and the long wavelength side of the second dichroic mirror 20 described above.

In other words, the light flux in the first wavelength band is a light flux in the visible light band having a wavelength of λ _S or more and λ _L or less, and the light flux in the second wavelength band is a visible light band with a wavelength of λ _S 'or more and λ _L ' or less When the luminous flux of
λ _S <λ _s ((2)
λ _L > λ _L '
Satisfy.

The wavelength of the blue luminous flux from the first LD group 1 is λ1, the wavelength of the red luminous flux from the second LD group 5 is λ2, and the converted luminous flux is at least λ3 to λ4. When including
λ 1 <λ _S <λ 3 (3)
λ 4 <λ _L <λ 2
It is preferable to satisfy

  That is, the first dichroic mirror 9 transmits one of the blue light flux from the first LD group 1 and the red light from the second LD group 5 and the converted light flux, and reflects the other.

  The reason for this configuration will be described below.

  FIG. 6 shows the spectral distribution of light projected onto the screen, where the long dotted line is the light of the blue light path, the solid line is the light of the green light path, and the short dotted line is the spectrum of the light of the red light path.

  As shown in FIG. 6, for the blue light path, in addition to light having a central wavelength near 440 nm and a narrow wavelength band, there are light having a wavelength of about 480 nm to about 500 nm. The former is light by the blue LD contained in the second LD group 5. Generally, when narrow band light is projected onto a screen with a central wavelength near 440 nm, it will appear purple. Therefore, if, for example, a picture of blue sky is projected without using the second dichroic mirror 9 shown in the present embodiment, the purple color may be strong and the discomfort may be strong.

  Therefore, in the present embodiment, in addition to light having a central wavelength of about 440 nm and a narrow wavelength band, light having a wavelength of about 480 nm to about 500 nm is guided to the blue light path. In other words, in addition to the blue luminous flux from the second LD group 5, the blue luminous flux having a longer wavelength than the blue luminous flux from the first LD group 1 is led to the blue light path.

  The light having a wavelength of about 480 nm to 500 nm is a component of the light flux from the fluorescent member 13 that is reflected by the second dichroic mirror 20 and guided to the blue light path. That is, the second dichroic mirror 20 guides the light flux in the second wavelength band in a direction different from the light fluxes other than the light flux in the second wavelength band among the light fluxes in the first wavelength band.

  By configuring the first dichroic mirror 9 and the second dichroic mirror 20 in this manner, the tint of blue is improved, and the above-described phenomenon of appearing purple can be suppressed.

  On the other hand, with regard to the red light path, in addition to light having a central wavelength of about 640 nm and a narrow wavelength band, there is light having a wavelength of about 590 nm to about 630 nm. The former is the light from the red LD contained in the second LD group 5. In general, when narrow band light is projected onto a screen with a central wavelength of about 640 nm, the vividness of red is low and it looks like dark red. For this reason, when the photograph of the eyelid is projected, for example, without using the second dichroic mirror 9 shown in this embodiment, the texture may be low and an image may be formed.

  Therefore, in the present embodiment, in addition to light having a central wavelength of about 640 nm and a narrow wavelength band, light having a wavelength of about 590 nm to about 630 nm is led to the red light path. In other words, in addition to the red luminous flux from the second LD group 5, the red luminous flux whose wavelength is longer than that of the red luminous flux from the second LD group 5 is led to the red light path.

  The light having a wavelength of about 590 nm to about 630 nm is a component of the light flux from the fluorescent member 13 that is reflected by the second dichroic mirror 20 and guided to the red light path. As a result, since the orange color is mixed with the light from the red LD, it is possible to suppress the phenomenon that the texture of the above-mentioned image is deteriorated.

  FIG. 8 is an xy chromaticity diagram, the dotted line indicates sRGB, and the solid line indicates the chromaticity on the screen surface in the present embodiment. Furthermore, the alternate long and short dash line is a so-called black body radiation locus indicating the relationship between temperature and color of the black body, ▪ indicates the chromaticity coordinates of D65, and ● indicates the chromaticity coordinates of white in the color triangle in the present embodiment. ing. Here, D65 is a standard illuminant with an x coordinate of 0.3127 and ay coordinate of 0.3290 in the xy chromaticity diagram.

  In FIG. 8, the chromaticity x on the horizontal axis indicates the mixing ratio of red light, and the chromaticity y on the vertical axis indicates the mixing ratio of green light. Since the red light mixing ratio, the green light mixing ratio, and the blue light mixing ratio add up to 1, if the red light mixing ratio and the green light mixing ratio are known, the blue light mixing ratio is also known. As an example, the lower left vertex of the color triangle shown in FIG. 8 is blue because the x coordinate is about 0.15 and the y coordinate is about 0.05. Similarly, the right vertex is red and the top vertex is green.

  As shown in FIG. 8, it can be seen that the color triangle in this embodiment can cover sRGB. In particular, it can be seen that B and R are very close to sRGB. On the other hand, G is not close to sRGB as compared to B and R, but it may be closer to sRGB by reducing the maximum modulation amount in the liquid crystal panel 26 for green by electrical correction.

  Further, as shown in FIG. 8 for white display, it can be seen that the white in the present embodiment can be reproduced so as to be closer to the D65 and black body radiation locus.

  The blue light and the red light reflected by the second dichroic mirror 20 first enter the wavelength selective phase plate 21. The wavelength selective phase plate 21 is configured to shift the phase of blue light by 90 ° and not to shift the phase of red light. In the present embodiment, the light beam incident on the wavelength selective phase plate 21 is aligned with P-polarized light by the polarization conversion element. That is, the blue light becomes S-polarized light, and the red light enters the PBS 22 as P-polarized light.

  The PBS 22 is configured to transmit P-polarized light and reflect S-polarized light. Accordingly, the blue light is reflected by the PBS 22 and is incident on the liquid crystal panel 25 for blue, and the red light is transmitted through the PBS 22 and is incident on the liquid crystal panel 27 for red.

  When white is displayed, blue light is modulated to P-polarized light and transmitted through the PBS 22, and red light is modulated to S-polarized light and reflected by the PBS 22 and enters the combining prism 24.

  On the other hand, among the converted light beams, the light beam of the second wavelength band transmitted through the second dichroic mirror 20 is incident on the phase plate 30, and the phase is shifted from P-polarized light to S-polarized light to be incident on the PBS 23. The light flux in the second wavelength band incident on the PBS 23 from the phase plate 30 is reflected by the PBS 23 and modulated by the liquid crystal panel 26 for green. That is, in the present embodiment, the luminous flux in the second wavelength band is green light.

  During white display, green light is modulated to P-polarized light, passes through the PBS 23, and enters the combining prism 24. Therefore, the blue light, the red light, and the green light are combined by the combining prism 24 and projected by the projection lens 28 onto a screen (not shown).

  A color separation / combination system is configured by the wavelength selective phase plate 21, the PBSs 22 and 23, the combining prism 24, and the phase plate 30 described above. Further, in the present embodiment, the liquid crystal panel (surface to be illuminated) is the liquid crystal panel 25 for blue, the liquid crystal panel 26 for green, and the liquid crystal panel 27 for red.

  As described above, in the present embodiment, the first LD group 1 is an LD that emits blue light, and the second LD group 5 is an LD that emits blue light and an LD that emits red light. Furthermore, the first dichroic mirror 9 transmits one of blue light and red light from the second LD group 5 and the light beam of the first wavelength band, and reflects the other. Further, the second dichroic mirror 20 guides the blue light from the second LD group 5 to the blue liquid crystal panel 25 and guides the red light from the second LD group 5 to the red liquid crystal panel 27.

  As described above, in the present embodiment, by providing the second LD group 5 as a light source capable of emitting red light in addition to the phosphor 29, red light which tends to run out when the phosphor 29 is used is provided. I'm compensating. Therefore, at the time of white display, the light amount of green light and blue light is reduced according to the red light having the smallest light amount among red light, green light and blue light, or the maximum modulation amount in the liquid crystal panel is red light. There is no need to reduce it altogether. Therefore, it is possible to provide a lighting device with higher light utilization efficiency and an image display device using the same.

  Furthermore, since the second dichroic mirror 20 is configured as described above, it is possible to distribute a part of the converted light beam to the blue light path and the red light path, and only the light from the LD light source is guided to the liquid crystal panel In comparison with the above, it is possible to project an image with better color rendering.

Second Embodiment
The configuration of a lighting apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 8 to 10. The illumination apparatus in the present embodiment includes a first LD group 1, a second LD group 35, a fluorescent member 41, a prism 37, and a second dichroic mirror 20.

  The difference between the present embodiment and the first embodiment described above is the configuration of the second LD group, the configuration of the fluorescent member, and the use of a prism 37 instead of the first dichroic mirror 9. Hereinafter, the detailed description of the same configuration as that of the first embodiment described above will be omitted.

  FIG. 8 is a diagram showing the configuration of a projector 100 equipped with the illumination device shown in the present embodiment. P-polarized light BP is emitted from the first LD group 1 and enters the prism 37. Here, P-polarized light is linearly polarized light vibrating in a plane including the normal line of the polarization separation surface 37 a of the prism 37 and the traveling direction of the P-polarized light BP, and S-polarized light is P-polarized light Linearly polarized light vibrating in the direction orthogonal to That is, the P-polarized light BP is linearly polarized light vibrating in the plane of FIG.

  FIG. 9 is a diagram showing the characteristics of the prism 37. As shown in FIG. As shown in FIG. 10, the prism 37 transmits P-polarized light for blue light and transmits blue light and red light while functioning as a PBS (polarization beam splitter) that reflects S-polarized light. It is configured to also function as a dichroic mirror that reflects the converted light flux. In other words, the prism 37 is configured to transmit one of the light flux from the second LD group 35 and the light flux from the fluorescent member 41 and reflect the other. Furthermore, the prism 37 is configured to guide the light flux having the same polarization direction as the light flux from the first LD group 1 in a different direction from the light flux from the first LD group 1 and the light flux having different polarization directions. . The P-polarized light BP passes through the prism 37 and is guided to the fluorescent member 41 by the condensing lenses 10, 11 and 12.

  FIG. 10 shows the structure of the fluorescent member 41. As shown in FIG. As shown in FIG. 10, the fluorescent member 41 includes a mirror 60 and a fluorescent body 42. Furthermore, in the mirror 60, a phosphor 42 is provided in a partial region, and a quarter wavelength plate 43 is provided in a region different from the partial region where the phosphor 42 is provided. ing.

  When the P-polarized light BP is incident on the phosphor 42, green light is emitted as in the first embodiment described above and travels to the prism 37. On the other hand, when the P-polarized light BP is incident on the 1⁄4 wavelength plate 43 and reflected by the mirror 60, the phase is shifted by 90 degrees and converted to S-polarized light. The S-polarized light BS converted by the 1⁄4 wavelength plate 43 is reflected by the prism 37 and guided to the second dichroic mirror 20.

  Further, the second LD group 35 is constituted only by R1 and R2 which are red LDs. A light beam from the second LD group 35 is converted into a substantially parallel light beam by a collimator lens group 36 formed of two collimator lenses, and enters a prism 37. In order for the prism 37 to transmit red light, the light flux from the second LD group 35 is transmitted through the prism 37 and guided to the second dichroic mirror 20.

  As described above, in this embodiment, the second LD group 35 is configured by only the red LDs R1 and R2 because the blue light S-polarized light BS can be emitted from the fluorescent member 41. It is possible to Therefore, since the number of LDs can be reduced as compared with the first embodiment described above, it is possible to provide a smaller-sized lighting device with less power consumption. The other effects are similar to those of the first embodiment described above.

  As described above, in the present embodiment, the first LD group 1 is an LD that emits blue light, and the second LD group 5 is an LD that emits red light. Further, the prism 37 guides the blue luminous flux having the same polarization direction as the luminous flux from the first LD group 1 in a direction different from the luminous flux from the first LD group 1 and the blue luminous flux having different polarization directions. Further, the prism 37 transmits one of the red luminous flux from the second LD group 5 and the blue luminous flux and the converted luminous flux which are different in polarization direction from the luminous flux from the first LD group 1 and the other. reflect.

  Although the luminous flux from the first LD group 1 is linearly polarized light in the present embodiment, the luminous flux from the first LD group 1 is also linear in the first embodiment as in the present embodiment. It may be polarized light.

  Further, the fluorescent member 41 may be configured such that the fluorescent members 42 and the 1⁄4 wavelength plate 43 are alternately provided.

Other Embodiments
In the embodiment described above, the configuration of the lighting apparatus using the LD group in which a plurality of LDs are arranged is illustrated, but the present invention is not limited to this. The number of LDs used in the lighting device may be appropriately adjusted in accordance with the desired brightness or the like, and the plurality of LDs may not necessarily be arranged.

1 1st LD group (1st light source)
2 Second LD group (second light source)
9 First dichroic mirror (first optical element)
13 Fluorescent member (wavelength conversion element)
20 Second dichroic mirror (second optical element)

Claims (6)

A first light source for emitting a blue luminous flux;
A second light source for emitting a red light beam and a blue light beam;
A wavelength conversion element that converts a light flux from the first light source into a converted light flux that differs in wavelength from the light flux from the first light source, and emits the converted light flux;
A first optical element that transmits one of light flux from the second light source and light flux of a first wavelength band included in the converted light flux and reflects the other;
A second optical element for guiding a light flux in a second wavelength band included in the converted light flux to a surface to be illuminated for green light and guiding the light flux from the second light source in a direction different from the light flux in the second wavelength band; A lighting device comprising
The blue light flux from the first light source is incident on the first optical element from a first direction,
The red light flux from the second light source and the blue light flux from the second light source are incident on the first optical element from a second direction different from the first direction,
The first wavelength band includes the second wavelength band.
A lighting device characterized by Wherein the light flux of the first wavelength band, the wavelength is a light beam following a visible light band lambda _S or lambda _L, the light flux of the second wavelength band, the wavelength lambda _{S 'or} lambda _L' following the light flux of the visible light band And when
λ _S <λ _s
λ _L > λ _L '
The lighting device according to claim 1, characterized in that: The wavelength of the blue luminous flux from the first light source is λ1;
The wavelength of the red luminous flux from the second light source is λ 2,
When the converted luminous flux includes at least a luminous flux having a wavelength of λ3 or more and λ4 or less,
λ 1 <λ _S <λ 3
λ 4 <λ _L <λ 2
The lighting device according to claim 2, characterized in that: The first light source is a laser diode that emits a blue luminous flux,
The second light source is a laser diode that emits a blue luminous flux and a laser diode that emits a red luminous flux,
The first optical element transmits one of the blue light flux and the red light flux from the second light source and the light flux of the first wavelength band, and reflects the other.
The second optical element is provided with the blue luminous flux from the second light source and the red luminous flux from the second light source with a blue illumination surface and a red illumination surface. Lead in the direction,
The lighting device according to any one of claims 1 to 3, characterized in that. The wavelength conversion element is a fluorescent member provided with a substrate and a phosphor.
The phosphor is provided in a partial region of the substrate, and a quarter wavelength plate is provided in a region different from the partial region,
The first light source is a laser diode that emits a blue light flux, and the light flux from the first light source is linearly polarized light.
The second light source is a laser diode that emits a red luminous flux,
The first optical element guides a blue luminous flux having the same polarization direction as the luminous flux from the first light source in a direction different from a luminous flux from the first light source and a blue luminous flux having different polarization directions. One of the red luminous flux from the second light source, the blue luminous flux having a different polarization direction from the luminous flux from the first light source, and the converted luminous flux is transmitted while the other is reflected.
The lighting device according to any one of claims 1 to 3, characterized in that. The lighting device according to any one of claims 1 to 5,
A color separation / combination system that guides the light flux from the second optical element to the surface to be illuminated and combines the light flux from the surface to be illuminated;
An illumination optical system that divides the light flux from the first optical element into a plurality of partial light fluxes and guides the plurality of partial light fluxes to the second optical element;
An image display apparatus characterized by

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