JP6717197B2 - Light source device and projector - Google Patents

Description

The present invention relates to a light source device and a projector.

BACKGROUND ART Conventionally, various light source devices have been developed in which excitation light emitted from an excitation light source is color-converted by a phosphor layer provided on a substrate and the color-converted light of each color is combined. Documents disclosing such a light source device include, for example, JP 2012-247491 A (Patent Document 1) and JP 2012-113224 A (Patent Document 2).

The light source device disclosed in Patent Document 1 includes a plurality of solid-state light sources including a first solid-state light source and a second solid-state light source, a driving unit for independently driving the plurality of solid-state light sources, and a ring-shaped first phosphor. A phosphor wheel in which the layer and the second phosphor layer are provided on the same substrate.

The excitation light emitted from the first solid-state light source is condensed on the first phosphor layer by the first condensing unit, so that the first fluorescence is emitted from the first phosphor layer. Excitation light emitted from the second solid-state light source is condensed on the second phosphor layer by the second condensing unit different from the first condensing unit, so that the second phosphor layer emits the first fluorescent light. Emits a second fluorescent light having a different colored light.

With the above-mentioned configuration, in the light source device disclosed in Patent Document 1, the lighting timings and intensities of the plurality of solid-state light sources are independently controlled, and the plurality of phosphor layers are rotated while rotating the phosphor wheel. By collecting the excitation light from each solid-state light source corresponding to each, it is possible to always obtain each fluorescence having the same wavelength. By synthesizing the first fluorescence and the second fluorescence as described above, high-intensity color light can be obtained.

In the light source device disclosed in Patent Document 2, a light source that emits polarized light whose polarization direction is aligned in one direction, and polarized light emitted from the light source can be split into a plurality of polarized lights with adjustable split ratios. A light splitting member, a plurality of light conversion members for converting each of a plurality of polarized light emitted from the light splitting member into a plurality of different colored lights, and a plurality of light conversion members arrayed and switched to be incident. A switching device that simultaneously performs color conversion of the polarized light in accordance with a predetermined order, and a combining device that combines and emits a plurality of color lights that have been color converted into different colors and are simultaneously emitted from the switching device.

With the above-described configuration, the light source device disclosed in Patent Document 2 can change the chromaticity of the emitted illumination light by adjusting the split ratio of the polarized light.

JP 2012-247491 A JP, 2012-113224, A

However, the light source device disclosed in Patent Document 1 requires a solid-state light source and a light condensing unit according to each phosphor layer. Further, since an optical path for guiding the excitation light emitted from the solid-state light source corresponding to each phosphor layer is required, there is a problem that the device becomes large and complicated.

In the light source device disclosed in Patent Document 2, each of the plurality of polarized lights emitted from the light splitting member is directly incident on the light conversion member. Further, the fluorescence emitted from the phosphor layer, which is an optical conversion member, is color-time-divided by the switching device and directly enters a synthesizing device such as a lot integrator.

As described above, in the light source device disclosed in Patent Document 2, a condensing unit for condensing the excitation light on the phosphor layer and a dichroic filter for color-combining the fluorescence emitted from the phosphor layer. Etendue becomes large because there is no such thing.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a light source device and a projector that do not increase etendue, reduce the number of components, and can be downsized. ..

The light source device based on the present invention is an excitation light source that emits excitation light for exciting fluorescence, and the fluorescent light that is disposed on the surface of the substrate and has wavelength regions different from each other depending on the excitation light emitted from the excitation light source. A plurality of phosphor layers that emit light, a first collimating unit that turns the plurality of fluorescence emitted from the plurality of phosphor layers and having different wavelength ranges into a plurality of parallel lights having different traveling directions, and And a combining unit that combines the plurality of parallel lights having different azimuths in the same optical path.

A projector according to the present invention is compatible with the light source device described above, a color separation unit that separates a light beam incident from the light source device into a plurality of color lights, and the color lights that are color-separated by the color separation unit. A plurality of image display elements for displaying images of the respective color lights, and color synthesizing means for synthesizing the image lights respectively modulated according to the images by the plurality of image display elements on the same optical axis, A projection system for projecting the image light combined by the color combining means.

According to the present invention, it is possible to provide a light source device and a projector in which the etendue does not increase, the number of parts is reduced, and the size can be reduced.

FIG. 3 is a diagram schematically showing the configuration of the projector according to the first embodiment. It is a figure which shows typically the light source device seen from the direction shown by the II line shown in FIG. It is a figure which shows the 1st example of arrangement|positioning of a laser light source and a collimating lens. It is a figure which shows the 2nd example of arrangement|positioning of a laser light source and a collimating lens. It is a figure which shows the 3rd example of arrangement|positioning of a laser light source and a collimating lens. It is a figure which shows the 4th example of arrangement|positioning of a laser light source and a collimating lens. FIG. 3 is a diagram showing a relationship between wavelengths of P-polarized light and S-polarized light and transmittance in the PBS mirror shown in FIG. 2. It is a figure which shows the relationship between the wavelength and the transmittance|permeability in the red reflective mirror shown in FIG. It is a figure which shows the relationship between the wavelength and the transmittance|permeability in the green reflective mirror shown in FIG. It is a figure which shows the relationship between the wavelength and the transmittance|permeability in the blue reflective mirror shown in FIG. It is a figure which shows the fluorescent substance wheel shown in FIG. It is a front view which shows the color prism unit which comprises some projectors shown in FIG. FIG. 6 is a diagram schematically showing the configuration of the projector according to the second embodiment. FIG. 14 is a diagram showing the relationship between the wavelength and the transmittance of P-polarized light and S-polarized light in the PBS mirror included in the projector shown in FIG. 13. It is a figure which shows the fluorescent substance wheel shown in FIG. 16 is a diagram showing the relationship between the wavelength and the transmittance of the dichroic film on the surface of the rotating plate of the phosphor wheel shown in FIG. 15. FIG. 9 is a diagram schematically showing the configuration of a projector according to a third embodiment. It is a figure which shows the fluorescent substance wheel shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are designated by the same reference numerals in the drawings, and the description thereof will not be repeated. Further, in the embodiments described below, when reference is made to the number, amount, etc., the scope of the present invention is not necessarily limited to the number, amount, etc., unless otherwise specified.

(Embodiment 1)
FIG. 1 is a diagram schematically showing the configuration of the projector according to the present embodiment. FIG. 2 is a diagram schematically showing the light source device included in the projector as viewed from the direction indicated by the line II in FIG. A projector according to the present embodiment will be described with reference to FIGS. 1 and 2.

As shown in FIGS. 1 and 2, the projector 600 according to the present embodiment includes a light source device 100, an illumination optical system 200, a TIR prism unit 300, a color prism unit 400, a DMD 450 as an image display element, and a projection optical system. With 500.

The light source device 100 includes an excitation light source 10A, an excitation light source 10B, a collimating means 20, a phosphor wheel 30, a condensing means 40, and a combining means 50.

The excitation light source 10A has a plurality of laser light sources 11. The excitation light source 10A is configured, for example, by arranging 8 vertical×7 horizontal laser light sources 11 on a base in FIG. 1 and electrically connecting them. As the laser light source 11, a semiconductor laser that emits ultraviolet light (excitation light) having a wavelength of 370 nm to 380 nm can be adopted. The laser light source 11 emits ultraviolet light and is arranged so as to be P-polarized with respect to a folding mirror group 23 and a PBS mirror, which will be described later.

Among the plurality of laser light sources 11, the ultraviolet light emitted from the two rows of laser light sources 11a from one end side (the left side in FIG. 1) of the excitation light source 10A is focused on the red phosphor layer 33R described later. Of the plurality of laser light sources 11, the ultraviolet light emitted from the three rows of laser light sources 11b located substantially in the center of the excitation light source 10A is focused on the green phosphor layer 33G described later. Among the plurality of laser light sources 11, the ultraviolet light emitted from the two rows of the laser light sources 11c from the other end side (the left side in FIG. 1) of the excitation light source 10A is condensed on the blue phosphor layer 33B described later.

The excitation light source 10B has a plurality of laser light sources 12. The excitation light source 10B is configured by, for example, arranging 4 vertical×6 horizontal laser light sources 12 on a base in FIG. 1 and electrically connecting them. As the laser light source 12, a semiconductor laser that emits ultraviolet light having a wavelength of 370 nm to 380 nm can be adopted. The laser light source 12 emits ultraviolet light and is arranged so as to be S-polarized with respect to a folding mirror group 23 and a PBS mirror, which will be described later.

Among the plurality of laser light sources 12, the ultraviolet light emitted from the two rows of laser light sources 12a from one end side (left side in FIG. 1) of the excitation light source 10B is condensed on the red phosphor layer 33R described later. Of the plurality of laser light sources 12, the ultraviolet light emitted from the two rows of laser light sources 12b located in the substantially central portion of the excitation light source 10A is focused on the green phosphor layer 33G described later. Of the plurality of laser light sources 12, the ultraviolet light emitted from the two rows of laser light sources 12c from the other end side (the right side in FIG. 1) of the excitation light source 10B is focused on the blue phosphor layer 33B described later.

The collimating means 20 includes a plurality of collimating lenses 21, a folding mirror group 23, and a PBS mirror 25. The collimating means 20 corresponds to second collimating means for converting the excitation light emitted from the plurality of laser light sources 11 and 12 into a plurality of substantially parallel light flux groups having different traveling directions.

Each of the plurality of collimator lenses 21 is arranged corresponding to each of the plurality of laser light sources 11 and 12. The plurality of collimator lenses 21 are arranged so as to face the plurality of laser light sources 11 and 12.

3 to 6 are diagrams showing first to fourth examples of the arrangement of the laser light source and the collimator lens. The positional relationship between the laser light source 11 and the collimator lens 21 will be described with reference to FIGS. 3 to 6. In any of the first to fourth examples of the arrangement of the laser light source and the collimator lens, the laser light source 11 and the collimator lens 21 are arranged in an array.

As shown in FIGS. 1 and 3, in the first example of the arrangement of the laser light source 11 and the collimating lens 21, the laser light sources 11a and 11c located on one end side and the other end side of the excitation light source 10A are Are arranged at positions deviated from the center lines of the collimator lenses 21a and 21c corresponding to. In this case, the laser light source 11 is arranged on the same plane, and the collimator lens 21 is also arranged on the same plane located away from the laser light source 11.

Specifically, when viewed along the center line of the collimator lens 21a, the laser light source 11a is arranged away from the center line of the collimator lens 21a in the direction toward the one end side of the excitation light source 10A. The laser light source 11b is arranged so that the center line of the collimator lens 21b and the center of the laser light source 11b overlap. The laser light source 11c is arranged away from the center line of the collimator lens 21c so as to approach the other end side of the excitation light source 10A.

As shown in FIG. 4, in the second example of the arrangement of the laser light source 11 and the collimator lens 21, the laser light sources 11a and 11c located on one end side and the other end side of the excitation light source 10A correspond to this. It is inclined with respect to the collimator lenses 21a and 21c. Specifically, the laser light sources 11a and 11c arranged in each row are inclined so as to face the center line of the excitation light source 10A in each row.

As shown in FIG. 5, in the third example of the arrangement of the laser light source 11 and the collimator lens 21, the collimator lenses 21a and 21c corresponding to the laser light sources 11a and 11c on one end side and the other end side of the excitation light source 10A, respectively. Is inclined with respect to the laser light sources 11a and 11c. Specifically, the collimator lenses 21a and 21c arranged in each row are inclined so as to face the center line of the excitation light source 10A in each corresponding row.

As shown in FIG. 6, in the fourth example of the arrangement of the laser light source 11 and the collimator lens 21, the laser light sources 11a and 11c on one end side and the other end side of the excitation light source 10A and the collimator lens 21a corresponding thereto are provided. , 21c are both inclined.

Specifically, the laser light sources 11a and 11c arranged in each row and the corresponding collimator lenses 21a and 21c are inclined so as to face the center line of the excitation light source 10A in each row.

As shown in FIGS. 3 to 6, the relative positions of the laser light source 11 and the collimating lens 21 are changed on one end side, the center side, and the other end side of the excitation light sources 10A and 10B, respectively, to emit the excitation light sources 10A and 10B. The generated ultraviolet light can be converted into three types of parallel light fluxes having different traveling angles. For example, the three types of parallel light fluxes have different traveling directions by 5°.

Specifically, each of the ultraviolet light emitted from the plurality of laser light sources 11a is converted into a parallel light flux traveling in the traveling direction DR1 by the collimator lens 21a. Each of the ultraviolet light emitted from the plurality of laser light sources 11b is converted into a parallel light flux traveling in the traveling direction DR2 by the collimator lens 21b. Each of the ultraviolet light emitted from the plurality of laser light sources 11c is converted by the collimator lens 21c into a parallel light flux traveling in the traveling direction DR3.

The traveling direction DR2 substantially coincides with the direction orthogonal to the row direction and the column direction in which the plurality of laser light sources 11 are arranged. Each of the advancing direction DR1 and the advancing direction DR3 intersects with the advancing direction DR2 with an intersection angle of 5°. The traveling direction DR1 and the traveling direction DR3 intersect with each other at an intersection angle of 10°.

The laser light source 12 and the collimator lens 21 are also arranged in the same manner as the laser light source 11 and the collimator lens 21. Thereby, each of the ultraviolet light emitted from the plurality of laser light sources 12a, 12b, 12c is converted by the collimator lenses 21a, 21b, 21c into a parallel light flux traveling in a direction parallel to the traveling directions DR1, DR2, DR3. ..

As shown in FIG. 2, the folding mirror group 23 is configured by arranging a plurality of folding mirrors 22 in a stepwise manner. Since the emission angle of the P-polarized light from the laser light source 11 is smaller than the emission angle of the S-polarized light and the luminous flux width is narrowed, by disposing the folding mirror 22 in this way, a plurality of parallel luminous fluxes converted by the collimator lens 21 is obtained. The interval between can be narrowed. In this case, it is preferable that there is no space between the plurality of parallel light beams.

As shown in FIGS. 1 and 2, the folding mirror group 23 transforms a parallel light flux group including a plurality of parallel light fluxes into a parallel light flux group having a reduced light flux cross-sectional area and directs the parallel light flux toward the light converging means 40. reflect. Specifically, the ultraviolet light emitted from the plurality of laser light sources 11a is converted into a parallel light flux group L1 having a reduced light flux cross-sectional area. The ultraviolet light emitted from the plurality of laser light sources 11b is converted into a parallel light flux group L2 having a reduced light flux cross-sectional area. The ultraviolet light emitted from the plurality of laser light sources 11c is converted into a parallel light flux group L3 having a reduced light flux cross-sectional area. The plurality of parallel luminous flux groups L1, L2, L3 have optical axes C1, C2, C3 and have different traveling directions.

The optical axis C2 coincides with the optical axis of the collimator lens 41 described later. The optical axis C1 and the optical axis C3 intersect with the optical axis C2 with a crossing angle of 5°. The optical axes C1 and C3 intersect each other with a crossing angle of 10°.

A PBS mirror 25 and a synthesizing means 50 including a red reflecting mirror 51R, a green reflecting mirror 51G, and a blue reflecting mirror 51B are arranged on the optical path of the ultraviolet light from the folding mirror group 23 to the condensing means 40. There is.

The PBS mirror 25 is configured to reflect the S-polarized light toward the synthesizing means 50 and transmit the P-polarized light toward the synthesizing means 50. The PBS mirror 25 intersects the parallel light flux group L2 at 45°, and intersects the parallel light flux groups L1 and L3 at 45.22° at approximately 45°. The PBS mirror 25 also crosses the parallel light flux emitted from the laser light sources 12a, 12b, 12c and converted by the collimating lenses 21a, 21b, 21c so as to travel in different directions at approximately 45°. ..

FIG. 7 is a diagram showing the relationship between the wavelength of P-polarized light and S-polarized light and the transmittance in the PBS mirror shown in FIG. FIG. 7 shows the transmittance characteristics of the PBS mirror 25 when light enters the reflecting surface of the PBS mirror with a crossing angle of 45°. The transmittance characteristic of the PBS mirror will be described with reference to FIG. 7.

As shown in FIG. 7, the PBS mirror 25 transmits P-polarized light that intersects at a crossing angle of 45° in the wavelength range of 370 nm to 410 nm, and crosses at a crossing angle of 45° in the wavelength range of 350 nm to 380 nm. Reflects S-polarized light. Such a PBS mirror 25 can be preferably used when the laser light source 11 emits ultraviolet light having the above-mentioned wavelength.

By using the PBS having the above-described characteristics, the plurality of parallel light flux groups L1, L2, L3 emitted from the plurality of laser light sources 11a, 11b, 11c and converted by the collimating lenses 21a, 21b, 21c have the PBS mirror 25. When passing through, it is combined with the parallel light flux emitted from the laser light sources 12a, 12b, 12c and converted by the collimating lenses 21a, 21b, 21c so as to travel in different directions. As a result, the parallel light flux groups L1, L2, L3 that have passed through the PBS mirror 25 include both the S polarization component and the P polarization component.

Again, as shown in FIG. 1, the red reflection mirror 51R, the green reflection mirror 51G, and the blue reflection mirror 51B are configured by a dichroic filter and allow light having a predetermined wavelength range to pass therethrough, and also have other predetermined wavelength ranges. It is configured to be able to reflect the light that it has.

The red reflection mirror 51R, the green reflection mirror 51G, and the blue reflection mirror 51B are collimator lenses in which the light converging means 40 includes the respective reflection surfaces of the red reflection mirror 51R, the green reflection mirror 51G, and the blue reflection mirror 51B in the normal direction. It is arranged so as to form angles of 42.5°, 45.0°, and 47.5° with respect to the optical axis of 41. The red reflection mirror 51R, the green reflection mirror 51G, and the blue reflection mirror 51B are arranged in this order from the side closer to the collimator lens 41.

The parallel light flux groups L1, L2, L3 transmitted through the PBS mirror 25 are incident on the blue reflection mirror 51B with incidence angles of 42.5°, 47.5° and 52.5°, respectively, and are transmitted therethrough. ..

The parallel light flux groups L1, L2, L3 transmitted through the blue reflection mirror 51B are incident on the green reflection mirror 51G with incident angles of 40.0°, 45.0°, and 50.0°, respectively, and are transmitted therethrough. To do.

The parallel light flux groups L1, L2, L3 transmitted through the green reflection mirror 51G are incident on the red reflection mirror 51R with incident angles of 37.5°, 42.5°, and 47.5°, respectively, and are transmitted therethrough. To do.

8 to 10 are diagrams showing the relationship between the wavelength and the transmittance in the red reflection mirror, the blue reflection mirror and the green reflection mirror. The transmittance characteristics of the red reflection mirror 51R, the green reflection mirror 51G, and the blue reflection mirror 51B will be described with reference to FIGS. 8 to 10.

As shown in FIG. 8, the red reflection mirror 51R substantially transmits light that intersects at crossing angles of 37.5°, 42.5°, and 47.5° in the wavelength range of 370 nm to 570 nm, and has a wavelength of 620 nm to 670 nm. In the region, light that intersects at intersection angles of 37.5°, 42.5°, and 47.5° is reflected.

Since the red reflection mirror 51R has such a transmittance characteristic, the red reflection mirror 51R can transmit the plurality of parallel light flux groups L1, L2, L3 composed of ultraviolet light as described above.

As shown in FIG. 9, the green reflecting mirror 51G substantially transmits light that intersects at crossing angles of 40.0°, 45.0°, and 50.0° in a wavelength range of 370 nm to 480 nm, and transmits light having wavelengths of 520 nm to 560 nm. In the region, light that intersects at crossing angles of 40.0°, 45.0°, and 50.0° is reflected.

Since the green reflection mirror 51G has such transmittance characteristics, the green reflection mirror 51G can transmit the plurality of parallel light flux groups L1, L2, L3 composed of ultraviolet light as described above.

As shown in FIG. 10, the blue reflection mirror 51B substantially transmits light that intersects at crossing angles of 42.5°, 47.5°, and 52.5° in the wavelength range of 370 nm to 410 nm, and transmits the wavelengths of 430 nm to 470 nm. In the region, light that intersects at crossing angles of 42.5°, 47.5°, and 52.5° is reflected.

Since the blue reflection mirror 51B has such transmittance characteristics, the blue reflection mirror 51B can transmit the plurality of parallel light flux groups L1, L2, L3 composed of ultraviolet light as described above.

As shown in FIG. 1 again, the plurality of parallel light flux groups L1, L2, L3 transmitted through the blue reflection mirror 51B, the green reflection mirror 51G, and the red reflection mirror 51R reach the light converging means 40, respectively. The light collecting means 40 includes a collimator lens 41 and a field lens 42.

The parallel light flux groups L1, L2, L3 pass through the collimator lens 41 and the field lens 42 and are condensed at different positions on the phosphor wheel 30 depending on the traveling direction. Specifically, the parallel light flux group L1 is condensed on the red phosphor layer 33R described later. The parallel light flux group L2 is condensed on the green phosphor layer 33G described later. The parallel light flux group L3 is condensed on the blue phosphor layer 33B described later.

FIG. 11 is a diagram showing the phosphor wheel shown in FIG. 1. The phosphor wheel 30 will be described with reference to FIGS. 1 and 11.

As shown in FIGS. 1 and 11, the phosphor wheel 30 is of a so-called reflection type and is configured to emit fluorescence toward the side on which ultraviolet light is incident. The phosphor wheel 30 includes a rotating plate (substrate) 31 having a reflective film 32 on its surface, a red phosphor layer 33R as a plurality of phosphor layers, a green phosphor layer 33G, a blue phosphor layer 33B, and a driving mechanism 35. including.

The rotary plate 31 is a part for applying various phosphor layers. As the rotary plate 31, a substrate made of various metals or resins can be adopted. For example, a substrate made of aluminum can be used as the rotary plate 31.

As the reflective film 32, for example, a silver coating layer formed by vapor deposition or the like can be adopted. The reflective film 32 reflects the fluorescence of each color emitted from the red phosphor layer 33R, the green phosphor layer 33G, and the blue phosphor layer 33B toward the field lens 42.

The red phosphor layer 33R, the green phosphor layer 33G, and the blue phosphor layer 33B are provided on the reflective film 32, respectively. The red phosphor layer 33R, the green phosphor layer 33G, and the blue phosphor layer 33B are each provided in a ring shape.

The red phosphor layer 33R is provided so as to surround the drive mechanism 35 provided at the center of the rotary plate 31. The green phosphor layer 33G is provided on the radially outer side of the red phosphor layer 33R so as to be adjacent thereto. The blue phosphor layer 33B is provided on the radially outer side of the green phosphor layer 33G so as to be adjacent thereto.

The red phosphor layer 33R, the green phosphor layer 33G and the blue phosphor layer 33B are desired to be a red phosphor, a green phosphor and a blue phosphor capable of converting ultraviolet light (excitation light) into red light, green light and blue light. It is formed by coating the reflection film 32 with a synthetic resin solution containing the above concentration.

The red phosphor contained in the red phosphor layer 33R is excited by the ultraviolet light of the parallel light flux group L1 focused on the red phosphor layer 33R. As a result, red fluorescence is emitted from the red phosphor layer 33R.

The red phosphor contained in the green phosphor layer 33G is excited by the ultraviolet light of the parallel light flux group L2 focused on the green phosphor layer 33G. As a result, green fluorescence is emitted from the green phosphor layer 33G.

The blue phosphor contained in the blue phosphor layer 33B is excited by the ultraviolet light of the parallel light flux group L3 condensed on the blue phosphor layer 33B. As a result, blue fluorescence is emitted from the blue phosphor layer 33B.

The drive mechanism 35 includes a motor and rotates the rotary plate 31. By rotating the rotating plate 31, it is possible to irradiate the phosphor that does not always emit light with ultraviolet light. Thereby, efficient light emission can be maintained.

Further, by providing the reflection film 32 as described above, the fluorescence of each color emitted from the red phosphor layer 33R, the green phosphor layer 33G and the blue phosphor layer 33B is reflected toward the field lens 42 side. You can This improves the light utilization efficiency.

The fluorescence of each color emitted from the phosphor layer of each color is efficiently incident on the collimator lens 41 by the field lens 42. The fluorescence of each color incident on the collimator lens 41 is converted by the collimator lens 41 into a plurality of parallel lights having different traveling directions.

In this way, the field lens 42 and the collimator lens 41 emit light from the red phosphor layer 33R, the green phosphor layer 33G, and the blue phosphor layer 33B, and have a plurality of fluorescences having different wavelength ranges from different traveling directions. It also functions as a first collimating means for making a plurality of substantially parallel lights.

The green fluorescence incident on the collimator lens 41 travels in a direction parallel to the optical axis of the collimator lens 41 (optical axis C2 direction). The red fluorescent light and the blue fluorescent light that have entered the collimator lens 41 travel in the directions parallel to the optical axis C1 and the optical axis C3 having the crossing angles of +5° and −5° with respect to the optical axis C2, respectively.

The fluorescence of each color converted into substantially parallel light is incident on the synthesizing means 50. The synthesizing means 50 is composed of the red reflection mirror 51R, the green reflection mirror 51G, and the blue reflection mirror 51B having the above-mentioned transmittance characteristics. The synthesizing unit 50 synthesizes a plurality of substantially parallel lights having different traveling directions in the same optical path.

Specifically, the red fluorescence converted into parallel light enters the red reflection mirror 51R at an incident angle of 47.5° and is reflected in a direction orthogonal to the optical axis of the collimator lens 41.

The green fluorescence converted into parallel light is incident on the red reflection mirror 51R at an incident angle of 42.5° and is transmitted therethrough, and then is incident on the green reflection mirror 51G at an incident angle of 45° and the light from the collimator lens 41 is incident on the collimator lens 41. It is reflected in the direction orthogonal to the axis.

The green fluorescence reflected by the green reflection mirror 51G is incident on the red reflection mirror 51R at an incident angle of 47.5°, is transmitted therethrough, and is combined with the red fluorescence in substantially the same optical axis.

The blue fluorescence converted into parallel light is incident on the red reflection mirror 51R at an incident angle of 37.5° and transmitted therethrough, and is incident on the green reflection mirror 51G at an incident angle of 40.0° and transmitted therethrough. The light enters the blue reflection mirror 51B at an incident angle of 42.5° and is reflected in a direction orthogonal to the optical axis of the collimator lens 41.

The blue fluorescence reflected by the blue reflection mirror 51B is incident on the green reflection mirror 51G at an incident angle of 45.0 and transmitted therethrough, and is incident on the red reflection mirror 51R at an incidence angle of 47.5° and transmitted therethrough. Then, the red fluorescence and the green fluorescence are combined on substantially the same optical axis (almost the same optical path).

In this way, by sequentially reflecting from the long wavelength side, the characteristic of the dichroic filter forming the red reflection mirror 51R, the green reflection mirror 51G, and the blue reflection mirror 51B is changed to a simple shortcut characteristic instead of bandpass or bandcut. it can. Thereby, the red reflection mirror 51R, the green reflection mirror 51G, and the blue reflection mirror 51B can be easily manufactured, and the fluorescence of each color can be efficiently combined.

The fluorescence of each color combined on substantially the same optical axis enters the illumination optical system 200 as white illumination light, passes through the TIR prism unit 300, and enters the color prism unit 400. The illumination light that has entered the color prism unit 400 is color-separated into red, green, and blue lights, and then enters a DMD (digital mirror device) 450. Each color light reflected by the DMD 450 sequentially passes through the color prism unit 400, the TIR prism unit 300 and the projection optical system 500 and is projected on the screen.

The illumination optical system 200 includes a first lens array 201, a second lens array 202, a superposing lens 203, a folding mirror 204, and an entrance lens 205.

The first lens array 201 and the second lens array 202 form an integrator optical system. The first lens array 201 has a plurality of lens cells 201a for dividing the combined fluorescent light (illumination light) of each color into a large number of luminous fluxes. The plurality of lens cells 201a are arranged in a matrix in a plane orthogonal to the illumination light. The lens cell 201a has a shape substantially similar to the display portion of the DMD 450.

The second lens array 202 has a plurality of lens cells 202a corresponding to the plurality of lens cells 201a of the first lens array 201. The second lens array 202 superimposes the image of the lens cell 201a on the DMD 450 together with the superposing lens 203. This makes the illuminance distribution on the DMD 450 uniform.

The entrance lens 205 transforms the illumination light into a telecentric luminous flux, and makes it enter the TIR prism unit 300.

The TIR prism unit 300 is composed of a first prism 310 and a second prism 320 each having a substantially triangular prism shape, and an air gap layer 310g is provided between the slopes of the prisms. The TIR prism unit 300 separates the illumination light which is the input light to the DMD 450 and the projection light (image light) which is the output light.

The illumination light emitted from the illumination optical system 200 is incident on the second prism 320 at an angle satisfying the condition of total reflection on the slope forming the air gap layer 311g, is totally reflected on the slope, and is incident on the color prism unit 400. ..

FIG. 12 is a front view showing a color prism unit forming a part of the projector shown in FIG. The color prism unit 400 will be described with reference to FIG.

As shown in FIG. 12, the color prism unit 400 decomposes the illumination light composed of fluorescence of each color into red, green, and blue color lights, and also combines the image light of each color on the same optical axis as described later. To do. That is, the color prism unit 400 has both a color separation function and a color combination function.

The color prism unit 400 is configured by sequentially combining a clear prism 410 having a substantially triangular prism shape, a red prism 420R and a blue prism 420B, and a block-shaped green prism 420G.

The red prism 420R has an inclined surface 421R facing the clear prism 410, a red dichroic surface 422R facing the blue prism 420B, and a prism end surface 423R facing a red DMD 450R described later. The red dichroic surface 422R is configured to reflect blue light and transmit blue light and green light.

The blue prism 420B has an inclined surface 421B facing the red prism 420R, a blue dichroic surface 422B facing the green prism 420G, and a prism end surface 423B facing a blue DMD 450B described later. The blue dichroic surface 422B is configured to transmit blue light while reflecting blue light.

The green prism 420G has an inclined surface 421G facing the blue prism 420B and a prism end surface 423G facing a DMD 450G for green to be described later.

An air gap layer 411g is provided between the clear prism 410 and the red prism 420R. The air gap layer 411g is inclined with respect to the projection optical axis AX. The plane formed by the projection optical axis AX and the normal line of the air gap layer 411g is orthogonal to the plane including the normal line of the air gap layer 311g of the TIR prism unit 300 and the projection optical axis AX.

An air gap layer 412g is provided between the red prism 420R and the blue prism 420B. The air gap layer 412g is inclined with respect to the projection optical axis. The plane defined by the projection optical axis AX and the normal to the air gap layer 412g is orthogonal to the plane defined by the air gap layer 311g and the projection optical axis AX of the TIR prism unit 300.

The inclination direction of the air gap layer 412g is opposite to the inclination direction of the air gap layer 411g formed by the clear prism 410 and the red prism 420R.

An air gap layer 413g is provided between the blue prism 420B and the green prism 420G. This air gap layer 413g is also inclined with respect to the projection optical axis AX. The plane formed by the projection optical axis AX and the normal line of the air gap layer 413g is orthogonal to the plane including the normal line of the air gap layer 311g of the TIR prism unit 300 and the projection optical axis AX.

The inclination direction of the air gap layer 413g is the same as the inclination direction of the air gap layer 411g formed by the clear prism 410 and the red prism 420R.

The illumination light incident from the entrance/exit surface of the clear prism 410 passes through the clear prism 410 and then enters the red prism 420R. Of the illumination light incident on the red prism 420R, red light is reflected by the red dichroic surface 422R, and other green light and blue light are transmitted therethrough.

The red light reflected by the red dichroic surface 422R is totally reflected by the air gap layer 411g on the clear prism 410 side, exits from the prism end surface 423R of the red prism 420R, and enters the red DMD 450R.

The blue light of the green light and the blue light transmitted through the red dichroic surface 422R is reflected by the blue dichroic surface 422B. The blue light reflected by the blue dichroic surface 422B is totally reflected by the air gap layer 412g provided adjacent to the red dichroic surface 422R, exits from the prism end surface 423B of the blue prism 420B, and enters the blue DMD 450B.

The green light of the green light and the blue light that has passed through the red dichroic surface 422R passes through the blue dichroic surface 422B, exits from the prism end surface 423G of the green prism 420G, and enters the DMD 450G for green.

The DMD 450R for red, the DMD 450B for blue, and the DMD 450G for green are composed of reflective display elements. The red DMD 450R, the blue DMD 450B, and the green DMD 450G include a large number of micromirrors (not shown). Each of the plurality of micromirrors constitutes each pixel (one pixel) on the image display surface of the DMD. The tilt angle or posture of each micromirror can be switched between two states.

The micromirror in one of the two states (ON state) reflects illumination light via the TIR prism unit 300 so as to become image light (projection light) directed to a projection optical system 500 described later. The micromirror in the other state (off state) reflects the illumination light so as to become non-projection light traveling in a direction away from the TIR prism unit 300.

An image is displayed by switching between two states for each pixel based on desired image information. The illumination light of each color is emitted as image light toward the TIR prism unit 300 as described above by being modulated according to the image.

The red image light reflected by the red DMD 450R enters the prism end surface 423R of the red prism 420R, is totally reflected by the air gap layer 411g on the clear prism 410 side, and then is reflected by the red dichroic surface 422R.

The blue image light reflected by the blue DMD 450B enters the prism end surface 423B of the blue prism 420B, is totally reflected by the air gap layer 412g on the red prism 420R side, and then is reflected by the blue dichroic surface 422B. The image light reflected by the blue dichroic surface 422B further passes through the red dichroic surface 422R.

The green image light reflected by the DMD 450G for green enters the prism end surface 423G of the green prism 420G and passes through the blue dichroic surface 422B and the red dichroic surface 422R.

Then, the red, blue, and green image lights transmitted through the red dichroic surface 422R are combined on the same optical axis. As shown in FIG. 1 again, the light exits from the entrance surface 410 a of the clear prism 410 and enters the TIR prism unit 300.

The image light that has entered the TIR prism unit 300 does not satisfy the conditions for total reflection here, so it passes through the air gap layer 311g and is projected onto the screen by the projection optical system (projection lens) 500.

With the configuration as described above, in the light source device 100 according to the present embodiment, one fluorescent wheel 30 generates a plurality of fluorescent lights, and these fluorescent lights are made to travel in mutually different traveling directions by the common collimating means. It is possible to convert the plurality of different substantially parallel lights and combine these parallel lights in the same optical path by the combining means 50.

Accordingly, in the light source device 100 and the projector 600 including the light source device 100, it is possible to reduce the number of the phosphor wheels 30 and the optical path while converting the fluorescence emitted from the phosphor wheel 30 into parallel light. The size is not increased, the number of parts is reduced, and the size can be reduced. Further, since the number of the phosphor wheels 30 is reduced, the number of motors serving as a drive source is also reduced, so that the light source device 100 can be driven more quietly.

Further, in the present embodiment, by changing the relative positional relationship between the laser light source 11 and the collimator lens 21, the excitation light emitted from the common excitation light source is converted into a plurality of parallel light flux groups having different traveling directions. can do. As a result, it becomes unnecessary to prepare an excitation light source (solid-state light source) for each parallel light flux group, so that the number of parts can be further reduced and the size can be reduced. Further, by using a laser light source, it becomes easy to focus light on a limited area on the phosphor layer, and thus the etendue of the optical system can be reduced.

Further, a condensing unit for condensing a plurality of parallel light flux groups having different traveling directions on the phosphor wheel 30, and fluorescent light of each color emitted from the phosphor wheel 30 is converted into a plurality of substantially parallel light beams having different traveling directions. By making the collimating means for conversion common, the number of parts can be further reduced and the size can be reduced.

In addition, by arranging the synthesizing means 50 on the optical path of the excitation light from the excitation light source to the phosphor wheel 30, the space of the optical path of the excitation light and the optical path of the emitted fluorescence can be shared. As a result, the size can be further reduced.

(Embodiment 2)
FIG. 13 is a diagram schematically showing the configuration of the projector according to the present embodiment. With reference to FIG. 13, projector 600A according to the present embodiment will be described.

As shown in FIG. 13, projector 600A according to the present embodiment differs from projector 600 according to the first embodiment in the configuration of light source device 100A. Other configurations are almost the same.

In the light source device 100A, as the excitation light sources 10A and 10B, those that emit blue light having a wavelength of 440 nm to 450 nm are adopted. Accordingly, the transmittance characteristic of the PBS mirror differs from that of the PBS mirror 25 according to the first embodiment.

FIG. 14 is a diagram showing the relationship between the wavelength and the transmittance of P-polarized light and S-polarized light in the PBS mirror included in the projector shown in FIG. FIG. 14 shows the transmittance characteristics of the PBS mirror when light enters the reflecting surface of the PBS mirror with a crossing angle of 45°. The transmittance characteristic of the PBS mirror will be described with reference to FIG.

As shown in FIG. 14, the PBS mirror transmits, for example, P-polarized light that intersects at a crossing angle of 45° in the wavelength range of 430 nm to 450 nm, and S that intersects at a crossing angle of 45° in the wavelength range of 400 nm to 450 nm. Reflects polarized light. Such a PBS mirror can be suitably used when the laser light source 11 emits blue light having the above wavelength.

By using the PBS mirror having such a transmittance characteristic, the parallel light flux groups L1, L2, and L3 that have passed through the PBS mirror include both the S polarization component and the P polarization component. These parallel light flux groups L1, L2, L3 are condensed at different positions on the phosphor wheel 30A by a condenser lens 70 as a condensing means.

Further, in the light source device 100A, the phosphor wheel 30A is of a so-called transmissive type, and is configured to emit fluorescence toward the side opposite to the side on which blue light enters.

FIG. 15 is a diagram showing the phosphor wheel shown in FIG. The phosphor wheel 30A will be described with reference to FIGS. 13 and 15.

As shown in FIGS. 13 and 15, the phosphor wheel 30A includes a rotating plate 31A having a dichroic film 32A provided on the surface opposite to the side on which blue light enters, a red phosphor serving as a plurality of phosphor layers. The layer 33R, the green phosphor layer 33G, the diffusion portion 33T, and the driving mechanism 35 are included.

The rotary plate 31A is configured to transmit blue light. As the rotating plate 31A, for example, a substrate made of glass, transparent resin, or the like can be used. The dichroic film 32A is composed of, for example, a dielectric multilayer film. The dichroic film 32A transmits blue light and reflects red light and green light. The dichroic film 32A is preferably provided in the region where the phosphor layer is formed.

The red phosphor layer 33R and the green phosphor layer 33G are provided on the dichroic film 32A, respectively. The red phosphor layer 33R, the green phosphor layer 33G, and the diffusion portion 33T are each provided in a ring shape.

The diffusion unit 33T is made of frosted glass or the like. The diffusing unit 33T diffuses the blue light while reducing speckles of the collected blue light.

The red phosphor layer 33R is provided so as to surround the drive mechanism 35 provided at the center of the rotary plate 31A. The green phosphor layer 33G is provided on the radially outer side of the red phosphor layer 33R so as to be adjacent thereto. The diffusion part 33T is provided so as to be adjacent to the green phosphor layer 33G on the radially outer side. The arrangement of the plurality of phosphor layers that emit fluorescence of each color and the diffusion unit 33T that transmits and diffuses blue light is not limited to the above-described arrangement, and can be appropriately changed.

The parallel luminous flux groups L1 and L2 that are transmitted through the rotating plate 31A and the dichroic film 32A and condensed on the red phosphor layer 33R and the green phosphor layer 33G are the phosphors included in the red phosphor layer 33R and the green phosphor layer 33G. Excite. As a result, red and green fluorescence is emitted from the red phosphor layer 33R and the green phosphor layer 33G.

The parallel light flux group L3 that has passed through the rotary plate 31A and focused on the diffusion unit 33T is transmitted while being diffused by the diffusion unit 33T.

FIG. 16 is a diagram showing the relationship between the wavelength and the transmittance of the dichroic film on the surface of the rotating plate of the phosphor wheel shown in FIG. The transmittance characteristic of the surface of the rotating plate will be described with reference to FIG.

As shown in FIG. 16, the surface of the rotating plate 31 provided with the dichroic film 32A substantially transmits light in the wavelength range of 430 nm to 470 nm and reflects light having a wavelength of 510 nm or more.

Since the surface of the rotating plate 31A has such transmittance characteristics, the red and green fluorescence emitted by the red phosphor layer 33R and the green phosphor layer 33G can be efficiently reflected toward the field lens 42 side. You can Further, the blue light can be guided to the diffusing section 33T and transmitted toward the field lens 42 side.

As shown in FIG. 13 again, the red and green fluorescent light emitted from the red fluorescent material layer 33R and the green fluorescent material layer 33G, and the blue light diffused by the diffusing unit 33T are the field lens 42 as the first collimating means. And collimated by the collimator lens 41.

The red and green fluorescent light and the blue light converted into the parallel light flux are combined into a light flux having the same optical axis by the combining means 50, and emitted as illumination light toward the illumination optical system 200. The illumination light incident on the illumination optical system 200 passes through the TIR prism unit 300 and is color-separated by the color prism unit 400.

The illumination light of each color separated by the color prism unit 400 is reflected by the DMD 450, and then enters the color prism unit 400 as image light. The image lights of the respective colors incident on the color prism unit 400 are combined on the same optical axis, pass through the TIR prism unit 300, and are projected onto the screen by the projection optical system 500.

Also in the present embodiment, only one phosphor wheel 30A is provided, a plurality of phosphors are generated by the phosphor wheel 30A, and a plurality of substantially different traveling directions are generated by the common collimating means. It is possible to convert into parallel light and combine these parallel lights into the same optical path by the combining means 50. Accordingly, in the light source device 100A and the projector 600A including the light source device 100A, the etendue does not increase, the number of parts is reduced, and the size can be reduced.

Further, since the excitation light does not pass through the synthesizing means 50, the function of transmitting the excitation light to each mirror of the synthesizing means becomes unnecessary, and a mirror having a simplified structure that is easier to manufacture can be used.

In addition, in the present embodiment, the case where the blue phosphor layer is omitted in the phosphor wheel by using the blue laser light source as the laser light source 12 has been described as an example, but the present invention is not limited to this and the ultraviolet light source A laser source of light may be used. In this case, in the phosphor wheel 30A, a blue phosphor layer 33B is provided in place of the diffusing portion 33T to transmit ultraviolet light as the dichroic film 32A and reflect light having wavelength ranges of red, green and blue. It is preferable to use one having characteristics.

(Embodiment 3)
FIG. 17 is a diagram schematically showing the configuration of the projector according to the present embodiment. The projector 600B according to the present embodiment will be described with reference to FIG.

As shown in FIG. 17, projector 600B according to the present embodiment has a configuration of phosphor wheel 30B of light source device 100B and illumination optical system 200B to projection optical system when compared with projector 600 according to the first embodiment. The configurations up to 500 are different.

The projector 600B includes a light source device 100B, an illumination optical system 200B, a color separation optical system 250 as a color separation unit, liquid crystal panels 470R, 470G, and 470B as image display elements, a cross dichroic prism 480 as a color combination unit, and a projection. An optical system 500 is provided.

The light source device 100B is different from the light source device 100 of the first embodiment in the configuration and position of the phosphor wheel 30B. Other configurations are almost the same.

FIG. 18 is a diagram showing the phosphor wheel shown in FIG. The phosphor wheel 30B will be described with reference to FIG.

As shown in FIG. 18, a blue phosphor layer 33B, a green phosphor layer 33G, and a red phosphor layer 33R may be sequentially provided from the center side of the rotating plate 31 toward the outer side in the radial direction. In this case, the blue phosphor layer 33B is provided so as to surround the drive mechanism 35 provided at the center of the rotating plate 31. The green phosphor layer 33G is provided on the radially outer side of the blue phosphor layer 33B so as to be adjacent thereto. The red phosphor layer 33R is provided on the radially outer side of the green phosphor layer 33G so as to be adjacent thereto.

The center position of the phosphor wheel 30B is located closer to the first lens array 201 than the optical axis of the collimator lens 41.

Thus, even when the phosphor wheel 30B is configured and arranged, the fluorescence of each color emitted from each phosphor layer is converted into the field lens 42, the collimator lens 41 the red reflection mirror 51R, the green reflection mirror 51G, and the green reflection mirror 51G. The blue reflection mirror 51B can be used to combine the light beams on substantially the same optical axis.

As shown in FIG. 17 again, the illumination optical system 200B includes a first lens array 201, a second lens array 202, a superposing lens 203, and a polarization conversion prism array 207.

The first lens array 201 and the second lens array 202 form an integrator optical system. The first lens array 201 splits the fluorescent light flux into a large number of light fluxes by lens cells having a shape substantially similar to the display portions of the liquid crystal panels 470R, 470G, 470B, and focuses the fluorescent light flux on the lens cells of the second lens array 202. ..

Each lens cell of the second lens array 202 forms the image of the corresponding lens cell of the first lens array 201 on the display portion of the liquid crystal panel 470R, 470G, 470B, and the image of each lens cell is formed by the superposing lens 203. Overlaid on panels 470R, 470G, 470B. Thereby, the illuminance distribution on the liquid crystal panels 470R, 470G, 470B can be made uniform.

Since the second lens array 202 and the phosphor light source are substantially conjugated, a plurality of secondary light source images are formed near the second lens array 202. The polarization conversion prism array 207 is manufactured by joining prism arrays having a polarization separation coating, separates these secondary light source images into two linearly polarized lights having different polarization directions, and reflects the S-polarized light on the polarization separation surface. Transmit P-polarized light. Then, the P-polarized light of the secondary light source image is converted into S-polarized light by the phase plate attached on the optical path of P-polarized light of the polarization conversion prism array 207, and the illumination light is converted into linearly polarized light. Emit.

The color separation optical system 250 separates the illumination light emitted from the illumination optical system 200B into three color lights of red, green, and blue and makes them enter the liquid crystal panels 470R, 470G, and 470B, respectively.

The color separation optical system 250 includes a red transmission dichroic mirror 251R, a blue transmission dichroic mirror 251B, reflection mirrors 256, 257, 258, relay lenses 261, 262, and field lenses 265R, 265G, 265B.

The red transmissive dichroic mirror 251R transmits red light and reflects green light and blue light. The blue transmission dichroic mirror 251B transmits blue light and reflects green light.

Of the illumination light emitted from the illumination optical system 200B, red light passes through the red transmissive dichroic mirror 251R. The red light transmitted through the red transmission dichroic mirror 251R is reflected by the reflection mirror 256 and passes through the field lens 265R. The red light that has passed through the field lens 265R enters the display portion of the liquid crystal panel 470R for red light.

Of the illumination light emitted from the illumination optical system 200B, green light and blue light are reflected by the red transmissive dichroic mirror 251R. Of the green light and the blue light reflected by the red transmissive dichroic mirror 251R, the green light is reflected by the blue transmissive dichroic mirror 251B and passes through the field lens 265G. The green light that has passed through the field lens 265G is incident on the display unit of the liquid crystal panel 470G for green light.

The blue light of the green light and the blue light reflected by the red transmissive dichroic mirror 251R passes through the blue transmissive dichroic mirror 251B, passes through the relay lens 261, the reflection mirror 257, the relay lens 262, and the reflection mirror 258 in this order, and is then a field lens. Pass 265B. The blue light that has passed through the field lens 265B is incident on the display portion of the liquid crystal panel 470B for blue light.

Since the length of the optical path of blue light is longer than the length of the paths of other colors, the relay lenses 261 and 262 (relay optical system) of equal magnification are arranged so that the conditions equivalent to those of other colors are obtained. ing.

Further, the field lenses 265R, 265G, 265B make the illumination light separated for each color into a telecentric luminous flux, and substantially uniform illumination light including the incident angle characteristic is incident on each liquid crystal panel 470R, 470G, 470B. To do.

The liquid crystal panels 470R, 470G, 470B display images of each color light on the display unit according to the image information. The liquid crystal panels 470R, 470G, 470B are sandwiched between polarizing plates (not shown). The incident side polarization plates, the liquid crystal panels 470R, 470G, and 470B and the emission side polarization plates perform optical modulation of each color light incident on each pixel, and only light in a specific polarization direction is transmitted to the cross dichroic prism 480 as image light. It is ejected toward.

The cross dichroic prism 480 combines the image light emitted from each of the liquid crystal panels 470R, 470G, and 470B on the same optical axis, and emits the combined image light toward the projection optical system 500.

The cross dichroic prism 480 is configured by combining four triangular prisms. The cross dichroic prism 480 has a red reflecting surface 481R and a blue reflecting surface 481B. The red reflecting surface 481R and the blue reflecting surface 481B are composed of a dielectric multilayer film.

The red image light that has entered the cross dichroic prism 480 is reflected by the red reflection surface 481R and emitted from the emission surface 480a. The blue image light that has entered the cross dichroic prism 480 is reflected by the blue reflection surface 481B and emitted from the emission surface 480a. The green image light that has entered the cross dichroic prism 480 passes through the red reflection surface 481R and the blue reflection surface 481B and is emitted from the emission surface 480a. As a result, the red image light, the blue image light, and the green image light are combined, emitted as an image from the emission surface 480a, and projected onto the screen via the projection optical system 500.

As described above, the light source device 100 can also be applied to the projector 600B using the liquid crystal panels 470R, 470G, and 470B. The phosphor wheel 30, the first lens array 201, the second lens array 202, and the polarization conversion prism array 207 are provided in one set, and since the laser light source is used, it is possible to prolong the life.

Further, since the light source device 100B according to the present embodiment has substantially the same configuration as the light source device 100 according to the first embodiment, the effect similar to that of the first embodiment can be obtained in the present embodiment. ..

In the light source devices according to the first to third embodiments, the order of the phosphor layers used in the phosphor wheel, or the order of the phosphor layers and the diffusing portion is as follows: the red reflection mirror 51R, the green reflection mirror 51G, and the blue reflection mirror. It is possible to make appropriate changes by adjusting the optical system such as the order of the reflecting mirror 51R.

Further, in the light source device according to the first embodiment, the phosphor wheel according to the third embodiment may be used, or in the light source device according to the third embodiment, the phosphor wheel according to the first embodiment is used. Good. As described above, when there are a plurality of embodiments, it is planned from the beginning to appropriately combine the characteristic portions of the respective embodiments unless otherwise specified.

Although the embodiments of the present invention have been described above, the embodiments disclosed this time are illustrative in all points and not restrictive. The scope of the present invention is shown by the claims, and includes meanings equivalent to the claims and all modifications within the scope.

10A, 10B excitation light source, 11, 11a, 11b, 11c, 12, 12a, 12b, 12c laser light source, 20 collimating means 21, 21a, 21b, 21c collimating lens, 22 folding mirror group, 23 folding mirror group, 25 PBS mirror , 30, 30A, 30B phosphor wheel, 31, 31B rotating plate, 32 reflective film, 32B dichroic film, 33B blue phosphor layer, 33G green phosphor layer, 33R red phosphor layer, 33T diffusion part, 35 drive mechanism, 40 condensing means, 41 collimator lens, 42 field lens, 50 combining means, 51B blue reflecting mirror, 51G green reflecting mirror, 51R red reflecting mirror, 70 condenser lens, 100, 100A light source device, 200, 200B illumination optical system, 201 first lens array, 201a, 202a lens cell, 202 second lens array, 203 superposing lens, 204 folding mirror, 205 entrance lens, 207 polarization conversion prism array, 250 color separation optical system, 251B blue transmission dichroic mirror, 251R Red transmission dichroic mirror, 256, 257, 258 reflection mirror, 261, 262 relay lens, 265B, 265G, 265R field lens, 300 prism unit, 310 first prism, 311g air gap layer, 320 second prism, 400 color prism unit , 410 clear prism, 410a incident surface, 411g, 412g, 413g air gap layer, 420R red prism, 420B blue prism, 420G green prism, 421B, 421R inclined surface, 422B blue dichroic surface, 422R red dichroic surface, 423B, 423G, 423R Prism end face, 470B, 470G, 470R liquid crystal panel, 480 cross dichroic prism, 480a emission face, 481B blue reflection face, 481R red reflection face, 500 projection optical system, 600, 600A, 600B projector.

Claims (11)

An excitation light source that emits excitation light for exciting fluorescence,
A plurality of phosphor layers that are arranged on the surface of the substrate and emit the fluorescence having different wavelength ranges from each other by the excitation light emitted from the excitation light source,
First collimating means for converting a plurality of the fluorescent lights emitted from the plurality of fluorescent material layers and having different wavelength ranges from each other into a plurality of parallel lights having different traveling directions,
A combining unit that combines the plurality of parallel lights having different traveling directions into the same optical path ,
A light source device in which all of the excitation light emitted from the excitation light source passes through the combining means . The light source device according to claim 1, wherein the plurality of phosphor layers include a red phosphor layer, a green phosphor layer, and a blue phosphor layer. The excitation light source is a plurality of laser light sources,
Second collimating means arranged corresponding to each of the plurality of laser light sources, for converting the excitation light emitted from the laser light source into a plurality of parallel light flux groups having different traveling directions;
The light source device according to claim 1 or 2 , further comprising a condensing unit that condenses each of the plurality of parallel light flux groups converted by the second collimating unit onto each of the plurality of phosphor layers. .. The first collimating means is disposed between the second collimating means and the phosphor layer in the optical path of the excitation light,
The light source device according to claim 3 , wherein the first collimating unit and the light converging unit are configured by the same member. The synthesizing means includes a plurality of dichroic filters that are arranged between the second collimating means and the condensing means in the optical path of the excitation light, transmit the excitation light, and reflect fluorescence in a corresponding wavelength range. The light source device according to claim 3 or 4 . The light source device according to claim 5 , wherein the plurality of dichroic filters are arranged so as to sequentially reflect the plurality of parallel lights having different wavelength bands from a wavelength band on the long wavelength side. The plurality of parallel lights having different wavelength ranges have red, green and blue wavelength ranges, respectively.
The wavelength of the excitation light is shorter than the parallel light having a blue wavelength region, the light source device according to any one of claims 1 to 6. The said surface of the said substrate is comprised so that the said fluorescent light emitted from the said some fluorescent substance layer may be reflected toward the said 1st collimating means, The any one of Claim 1 to 7 characterized by the above-mentioned. Light source device. The plurality of phosphor layers are formed in an annular shape,
The substrate is rotatable in, a light source device according to any one of claims 1 to 8. A light source device according to any one of claims 1 to 9 ;
Color separation means for separating a light beam incident from the light source device into a plurality of color lights,
A plurality of image display elements which are provided corresponding to the respective color lights separated by the color separation means and which display an image of the respective color lights,
A color synthesizing means for synthesizing each of image light modulated according to an image by the plurality of image display elements on the same optical axis,
A projection system that projects the image light combined by the color combining unit. The image display device is a reflective display device,
The projector according to claim 10 , wherein the color separation unit and the color combination unit are configured by the same member.