WO2016080295A1 - Light source device and projector - Google Patents

Abstract

This light source device (100) includes: excitation light sources (10A, 10B) that radiate excitation light for exciting fluorescence; a plurality of phosphor layers (33R, 33G, 33B) that are provided on the surface of a substrate (31), and emit fluorescences having different wavelength regions as a result of the excitation light radiated from the excitation light sources; a first collimating means (40) that converts the plurality of fluorescences, which are emitted from the plurality of phosphor layers (33R, 33G, 33B) and have different wavelength regions, into a plurality of substantially parallel light beams having different advancing directions; and a combining means (50) that combines the plurality of substantially parallel light beams having different advancing directions onto substantially the same optical path.

Description

Light source device and projector

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

Conventionally, various types of 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 light of each color that has undergone color conversion is synthesized. 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 Literature 1 includes a plurality of solid light sources including a first solid light source and a second solid light source, driving means for independently driving the plurality of solid light sources, and a ring-shaped first phosphor. And 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 means, whereby the first fluorescence is emitted from the first phosphor layer. The excitation light emitted from the second solid state light source is condensed on the second phosphor layer by the second condensing means different from the first condensing means, so that the first fluorescent light is emitted from the second phosphor layer. Emits second fluorescence having different color light.

By having the above-described configuration, the light source device disclosed in Patent Document 1 controls the lighting timing and intensity of the plurality of solid-state light sources independently, and rotates the phosphor wheel while rotating the plurality of phosphor layers. 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, high-intensity color light can be obtained.

In the light source device disclosed in Patent Document 2, a light source that emits polarized light with the polarization direction aligned in one direction and the polarized light emitted from the light source can be divided into a plurality of polarized lights so that the division ratio can be adjusted. A light splitting member, a plurality of light converting members for converting each of a plurality of polarized lights emitted from the light splitting members into different color lights, and a plurality of light incident by switching and arranging the plurality of light converting members A switching device that simultaneously converts colors of the polarized light according to a predetermined order, and a combining device that combines and outputs a plurality of color lights that have been color-converted to different colors that are simultaneously emitted from the switching device.

By having the above-described configuration, in the light source device disclosed in Patent Document 2, it is possible to 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, in the light source device disclosed in Patent Document 1, a solid light source and a condensing unit are required according to each phosphor layer. In addition, since an optical path for guiding excitation light emitted from the solid-state light source corresponding to each phosphor layer is required, there is a problem that the apparatus 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 converting member. In addition, the fluorescence that has been color-time-divided by the switching device and emitted from the phosphor layer, which is an optical conversion member, is directly incident on a synthesis device such as a lot integrator.

As described above, in the light source device disclosed in Patent Document 2, a condensing unit for condensing excitation light on the phosphor layer, and a dichroic filter for color-combining fluorescence emitted from the phosphor layer. Etendue is increased because no etc. are provided.

The present invention has been made in view of the above-described 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 according to the present invention includes an excitation light source that emits excitation light for exciting fluorescence and the fluorescence that is disposed on the surface of the substrate and has different wavelength ranges depending on the excitation light emitted from the excitation light source. A plurality of phosphor layers that emit light from the plurality of phosphor layers, and a plurality of the fluorescent lights having different wavelength ranges from each other, and a plurality of parallel lights having different traveling directions, and the traveling Synthesizing means for synthesizing the plurality of parallel lights having different orientations in the same optical path.

The projector according to the present invention corresponds to the light source device described above, color separation means for separating a light beam incident from the light source device into a plurality of color lights, and the color lights separated by the color separation means. A plurality of image display elements for displaying images of the respective color lights, and a color composition unit for synthesizing each of the image lights 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 synthesized by the color synthesizing means.

According to the present invention, it is possible to provide a light source device and a projector that do not increase etendue, can reduce the number of parts, and can be miniaturized.

1 is a diagram schematically showing a configuration of a projector according to Embodiment 1. FIG. It is a figure which shows typically the light source device seen from the direction shown to the II line | wire 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 with a laser light source and a collimating lens. It is a figure which shows the 3rd example of arrangement | positioning with 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 in the red reflection mirror shown in FIG. 1, and the transmittance | permeability. It is a figure which shows the relationship between the wavelength in the green reflective mirror shown in FIG. 1, and the transmittance | permeability. It is a figure which shows the relationship between the wavelength in the blue reflective mirror shown in FIG. 1, and the transmittance | permeability. 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. 6 is a diagram schematically showing a configuration of a projector according to Embodiment 2. FIG. It is a figure which shows the relationship between the wavelength of P polarized light and S polarized light, and the transmittance | permeability in the PBS mirror with which the projector shown in FIG. 13 is equipped. It is a figure which shows the fluorescent substance wheel shown in FIG. It is a figure which shows the relationship between the wavelength of a dichroic film | membrane and the transmittance | permeability in the rotating plate surface of the fluorescent substance wheel shown in FIG. FIG. 5 schematically shows a 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 following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated. In the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified.

(Embodiment 1)
FIG. 1 is a diagram schematically showing a configuration of a projector according to the present embodiment. FIG. 2 is a diagram schematically showing a light source device provided in the projector as viewed from the direction indicated by line II shown 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, projector 600 according to the present embodiment includes light source device 100, illumination optical system 200, TIR prism unit 300, color prism unit 400, DMD 450 as an image display element, and projection optical system. 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 synthesizing means 50.

The excitation light source 10 </ b> A has a plurality of laser light sources 11. The excitation light source 10A is configured, for example, by arranging 8 × 7 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 employed. The laser light source 11 emits ultraviolet light and is arranged to be P-polarized light with respect to a later-described folding mirror group 23 and a PBS mirror.

Among the plurality of laser light sources 11, ultraviolet light emitted from two rows of laser light sources 11a from one end side (left side in FIG. 1) of the excitation light source 10A is condensed on a red phosphor layer 33R described later. Among the plurality of laser light sources 11, the ultraviolet light emitted from the three rows of laser light sources 11b located substantially at the center of the excitation light source 10A is collected on a green phosphor layer 33G described later. Among the plurality of laser light sources 11, the ultraviolet light emitted from the two rows of laser light sources 11c from the other end side (left side in FIG. 1) of the excitation light source 10A is collected on a 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, for example, by arranging 4 × 6 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 employed. The laser light source 12 emits ultraviolet light and is disposed so as to be S-polarized light with respect to a later-described folding mirror group 23 and a PBS mirror.

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 a red phosphor layer 33R described later. Among the plurality of laser light sources 12, the ultraviolet light emitted from the two rows of laser light sources 12b positioned substantially at the center of the excitation light source 10A is condensed on a green phosphor layer 33G described later. Among 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 (right side in FIG. 1) of the excitation light source 10B is condensed on a 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 collimating lenses 21 is arranged corresponding to each of the plurality of laser light sources 11 and 12. The plurality of collimating lenses 21 are arranged so as to face the plurality of laser light sources 11 and 12.

3 to 6 are views showing a first example to a fourth example of the arrangement of the laser light source and the collimating lens. The positional relationship between the laser light source 11 and the collimating lens 21 will be described with reference to FIGS. In any of the first to fourth examples of the arrangement of the laser light source and the collimating lens, the laser light source 11 and the collimating 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 shifted from the center lines of the collimating lenses 21a and 21c corresponding to. In this case, the laser light source 11 is arranged on the same plane, and the collimating 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 collimating lens 21a, the laser light source 11a is disposed away from the center line of the collimating lens 21a in a direction approaching one end of the excitation light source 10A. The laser light source 11b is arranged so that the center line of the collimating 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 collimating 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 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 correspond to this. It inclines with respect to the collimating 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 collimating lens 21, collimating 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. Is inclined with respect to the laser light sources 11a and 11c. Specifically, the collimating 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 collimating 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 collimating lens 21a corresponding thereto. , 21c are both inclined.

Specifically, the laser light sources 11a and 11c arranged in each row and the collimating lenses 21a and 21c corresponding to the laser light sources 11a and 11c 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 excitation light sources 10A and 10B are emitted from the excitation light sources 10A and 10B by changing the relative positions of the laser light source 11 and the collimating lens 21 on one end side, the center side, and the other end side of the excitation light sources 10A and 10B, respectively. The generated ultraviolet light can be converted into three types of parallel light fluxes having different traveling angles. For example, three kinds of parallel light beams 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 beam traveling in the traveling direction DR1 by the collimating lens 21a. Each of the ultraviolet light emitted from the plurality of laser light sources 11b is converted into a parallel light beam traveling in the traveling direction DR2 by the collimating lens 21b. Each of the ultraviolet light emitted from the plurality of laser light sources 11c is converted into a parallel light beam traveling in the traveling direction DR3 by the collimating lens 21c.

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 traveling direction DR1 and the traveling direction DR3 intersects with the traveling direction DR2 with an intersection angle of 5 °. The traveling direction DR1 and the traveling direction DR3 intersect with an intersection angle of 10 °.

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

As shown in FIG. 2, the folding mirror group 23 is configured by arranging a plurality of folding mirrors 22 in a staircase pattern. Since the exit angle in the P-polarization direction from the laser light source 11 is smaller than the exit angle in the S-polarization direction, the width of the light beam becomes narrow. Thus, by arranging the folding mirror 22 in this way, a plurality of parallel light beams converted by the collimator lens 21 are obtained. The interval between them can be narrowed. In this case, it is preferable that there is no interval between the plurality of parallel light beams.

As shown in FIG. 1 and FIG. 2, the folding mirror group 23 converts the parallel light flux group composed of a plurality of parallel light fluxes into a parallel light flux group with a reduced light beam cross-sectional area, and directs it toward the light collecting means 40. reflect. Specifically, the ultraviolet light emitted from the plurality of laser light sources 11a is converted into a parallel light beam group L1 having a reduced light beam cross-sectional area. Ultraviolet light emitted from the plurality of laser light sources 11b is converted into a parallel light beam group L2 having a reduced light beam cross-sectional area. The ultraviolet light emitted from the plurality of laser light sources 11c is converted into a parallel light beam group L3 having a reduced light beam cross-sectional area. The plurality of parallel light beam groups L1, L2, and L3 have optical axes C1, C2, and 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 an intersection angle of 5 °. The optical axis C1 and the optical axis C3 intersect with an intersection angle of 10 °.

On the optical path of the ultraviolet light from the folding mirror group 23 to the condensing means 40, the combining means 50 including the PBS mirror 25 and the red reflecting mirror 51R, the green reflecting mirror 51G, and the blue reflecting mirror 51B is arranged. Yes.

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

FIG. 7 is a diagram showing the relationship between the wavelength and transmittance of P-polarized light and S-polarized light 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 45 ° crossing angle. The transmittance characteristics of the PBS mirror will be described with reference to FIG.

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

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

Again, as shown in FIG. 1, the red reflecting mirror 51R, the green reflecting mirror 51G, and the blue reflecting mirror 51B are configured by dichroic filters, and transmit light having a predetermined wavelength range, while other predetermined wavelength ranges are set. The light which has is comprised so that reflection is possible.

The red reflecting mirror 51R, the green reflecting mirror 51G, and the blue reflecting mirror 51B are collimator lenses in which the respective normal directions of the reflecting surfaces of the red reflecting mirror 51R, the green reflecting mirror 51G, and the blue reflecting mirror 51B are included in the light collecting means 40. It arrange | positions so that the angle of 42.5 degrees, 45.0 degrees, and 47.5 degrees may be made with respect to 41 optical axes. The red reflection mirror 51R, the green reflection mirror 51G, and the blue reflection mirror 51B are arranged in this order from the side close to the collimator lens 41.

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

The parallel light beam groups L1, L2, and L3 transmitted through the blue reflecting mirror 51B are incident on the green reflecting 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, and L3 transmitted through the green reflecting mirror 51G are incident on the red reflecting 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 reflecting mirror 51R, the green reflecting mirror 51G, and the blue reflecting mirror 51B will be described with reference to FIGS.

As shown in FIG. 8, the red reflecting mirror 51R substantially transmits light that intersects at intersection angles of 37.5 °, 42.5 °, and 47.5 ° in the wavelength region 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 reflecting mirror 51R has such transmittance characteristics, the red reflecting mirror 51R can transmit the plurality of parallel light flux groups L1, L2, and L3 made 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 the wavelength region of 370 nm to 480 nm, and has a wavelength of 520 nm to 560 nm. In the region, light that intersects at intersection 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, and L3 made of ultraviolet light as described above.

As shown in FIG. 10, the blue reflecting mirror 51B substantially transmits light that intersects at crossing angles of 42.5 °, 47.5 °, and 52.5 ° in the wavelength region of 370 nm to 410 nm, and has a wavelength of 430 nm to 470 nm. In the region, light that intersects at intersection 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, and L3 made of ultraviolet light as described above.

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

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

FIG. 11 is a diagram showing the phosphor wheel shown in FIG. 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 the ultraviolet light is incident. The phosphor wheel 30 includes a rotating plate (substrate) 31 having a reflective film 32 provided on the surface, a red phosphor layer 33R as a plurality of phosphor layers, a green phosphor layer 33G, a blue phosphor layer 33B, and a drive mechanism 35. including.

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

As the reflective film 32, for example, a silver coating layer formed by vapor deposition or the like can be employed. The reflection 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 33 </ b> R 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 outer side in the radial direction of the red phosphor layer 33R so as to be adjacent thereto. The blue phosphor layer 33B is provided on the outer side in the radial direction 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 red phosphor, green phosphor and blue phosphor capable of converting ultraviolet light (excitation light) into red light, green light and blue light. It is formed by applying a synthetic resin solution containing at a concentration of 5 on the reflective film 32.

The red phosphor included in the red phosphor layer 33R is excited by the ultraviolet light of the parallel light flux group L1 collected on the red phosphor layer 33R. Thereby, 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 collected on the green phosphor layer 33G. Thereby, 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 collected on the blue phosphor layer 33B. Thereby, blue fluorescence is emitted from the blue phosphor layer 33B.

The drive mechanism 35 includes a motor and rotates the rotating plate 31. By rotating the rotating plate 31, it is possible to irradiate the phosphor that is not always emitting 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. Can do. Thereby, the utilization efficiency of light improves.

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.

As described above, 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 emit a plurality of fluorescence having different wavelength ranges from each other in different traveling directions. It also functions as 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 (the optical axis C2 direction). Red fluorescence and blue fluorescence incident on the collimator lens 41 travel in directions parallel to the optical axis C1 and the optical axis C3 having 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 synthesis means 50. The synthesizing unit 50 includes a red reflecting mirror 51R, a green reflecting mirror 51G, and a blue reflecting mirror 51B having the above-described transmittance characteristics. The synthesizing unit 50 synthesizes a plurality of substantially parallel lights having different traveling directions into the same optical path.

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

The green fluorescence converted into parallel light is incident on the red reflecting mirror 51R at an incident angle of 42.5 ° and transmitted therethrough, and incident on the green reflecting mirror 51G at an incident angle of 45 °. Reflected in a direction perpendicular 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 ° and is transmitted therethrough and synthesized with substantially the same optical axis as the red fluorescence.

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

The blue fluorescence reflected by the blue reflecting mirror 51B enters the green reflecting mirror 51G at an incident angle of 45.0 and is transmitted therethrough, and enters the red reflecting mirror 51R at an incident angle of 47.5 ° and is transmitted therethrough. Then, they are synthesized with substantially the same optical axis (substantially the same optical path) as red fluorescence and green fluorescence.

As described above, by sequentially reflecting from the long wavelength side, the characteristics of the dichroic filters constituting the red reflecting mirror 51R, the green reflecting mirror 51G, and the blue reflecting mirror 51B are changed to the simple characteristics of the shortcut instead of the band pass and the band cut. it can. Thereby, the red reflecting mirror 51R, the green reflecting mirror 51G, and the blue reflecting mirror 51B can be easily manufactured, and the fluorescence of each color can be efficiently synthesized.

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

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

The first lens array 201 and the second lens array 202 constitute an integrator optical system. The first lens array 201 has a plurality of lens cells 201a for dividing the combined fluorescence (illumination light) of each color into a number of light beams. 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 unit 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 201 a on the DMD 450 together with the superimposing lens 203. Thereby, the illuminance distribution on the DMD 450 is made uniform.

The entrance lens 205 converts the illumination light into a telecentric light beam and makes it incident on the TIR prism unit 300.

The TIR prism unit 300 includes 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 each prism. The TIR prism unit 300 separates illumination light that is input light to the DMD 450 and projection light (image light) that is output light.

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

FIG. 12 is a front view showing a color prism unit constituting 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 illumination light composed of fluorescence of each color into red, green, and blue color lights and 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 composition 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 a slope 421R facing the clear prism 410, a red dichroic surface 422R facing the blue prism 420B, and a prism end surface 423R facing red DMD 450R described later. The red dichroic surface 422R is configured to transmit blue light and green light while reflecting red light.

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

The green prism 420G has a slope 421G facing the blue prism 420B and a prism end surface 423G facing green DMD 450G 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 normal line of the projection optical axis AX and 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 formed by the normal line of the projection optical axis AX and the air gap layer 412g is orthogonal to the plane formed by 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 412g is opposite to the inclination direction of the air gap layer 411g 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. The air gap layer 413g is also inclined with respect to the projection optical axis AX. The plane formed by the normal line of the projection optical axis AX and 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 by the clear prism 410 and the red prism 420R.

The illumination light incident from the input / output 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 the 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.

Of the green light and blue light transmitted through the red dichroic surface 422R, blue light 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, is emitted from the prism end surface 423B of the blue prism 420B, and enters the blue DMD 450B.

Of the green light and blue light transmitted through the red dichroic surface 422R, the green light is transmitted through the blue dichroic surface 422B, is emitted from the prism end surface 423G of the green prism 420G, and enters the green DMD 450G.

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

The micromirror in one of the two states (on state) reflects the illumination light through the TIR prism unit 300 so as to become image light (projection light) toward the projection optical system 500 described later. The micromirror in the other state (off state) reflects the illumination light so as to be 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 according to the image and emitted toward the TIR prism unit 300 as image light as described above.

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 green DMD 450G is incident on 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 incident surface 410 a of the clear prism 410 and enters the TIR prism unit 300.

Since the image light incident on the TIR prism unit 300 does not satisfy the total reflection condition here, it passes through the air gap layer 311g and is projected onto the screen by the projection optical system (projection lens) 500.

By having the configuration as described above, in the light source device 100 according to the present embodiment, a single phosphor wheel 30 generates a plurality of fluorescence, and these fluorescences travel in a traveling direction with a common collimating means. It can be converted into a plurality of different substantially parallel lights, and these parallel lights can be combined into the same optical path by the combining means 50.

Thereby, in the light source device 100 and the projector 600 including the light source device 100, the number of the phosphor wheels 30 and the optical path can be reduced while converting the fluorescence emitted from the phosphor wheel 30 into the parallel light. The size is not increased, and the number of parts can be reduced and the size can be reduced. In addition, since the number of phosphor wheels 30 is reduced, the number of motors that are driving sources is also reduced, so that the light source device 100 can be driven more quietly.

In the present embodiment, by changing the relative positional relationship between the laser light source 11 and the collimating 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, there is no need to prepare an excitation light source (solid light source) for each parallel light beam group, so that the number of components can be further reduced and the size can be reduced. Further, by using a laser light source, it becomes easier to focus on a limited area on the phosphor layer, so that the etendue of the optical system can be reduced.

Further, a light collecting means for condensing a plurality of parallel light flux groups having different traveling directions onto the phosphor wheel 30, and fluorescence of each color emitted from the phosphor wheel 30 into a plurality of substantially parallel lights having different traveling directions. By using the collimating means for conversion in 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 optical path of the excitation light and the light path of the emitted fluorescence can be shared. Thereby, further miniaturization becomes possible.

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

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

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

FIG. 14 is a diagram showing the relationship between the wavelengths of P-polarized light and S-polarized light and the transmittance in the PBS mirror provided in the projector shown in FIG. FIG. 14 shows the transmittance characteristics of the PBS mirror when light enters the reflective surface of the PBS mirror with an angle of 45 °. With reference to FIG. 14, the transmittance characteristics of the PBS mirror will be described.

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 region of 430 nm to 450 nm and crosses at a crossing angle of 45 ° in the wavelength region 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-described wavelength.

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

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

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

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 is incident, and a red phosphor as a plurality of phosphor layers. The layer 33R, the green phosphor layer 33G, the diffusion portion 33T, and the drive mechanism 35 are included.

The rotating 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 adopted. 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 a 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 diffusion unit 33T diffuses 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 in the center of the rotating plate 31A. The green phosphor layer 33G is provided on the outer side in the radial direction of the red phosphor layer 33R so as to be adjacent thereto. The diffusion portion 33T is provided on the outer side in the radial direction of the green phosphor layer 33G so as to be adjacent thereto. Note that the arrangement of the plurality of phosphor layers that emit fluorescence of each color and the diffusion portion 33T that transmits and diffuses blue light is not limited as described above, and can be changed as appropriate.

The parallel light flux groups L1 and L2 that are transmitted through the rotating plate 31A and the dichroic film 32A and are collected on the red phosphor layer 33R and the green phosphor layer 33G are phosphors included in the red phosphor layer 33R and the green phosphor layer 33G. Excited. Thereby, 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 rotating plate 31A and condensed on the diffusing portion 33T passes through the diffusing portion 33T while being diffused.

FIG. 16 is a diagram showing the relationship between the wavelength and transmittance of the dichroic film on the surface of the rotating plate of the phosphor wheel shown in FIG. With reference to FIG. 16, the transmittance | permeability characteristic of the rotating plate surface is demonstrated.

As shown in FIG. 16, on the surface of the rotating plate 31 provided with the dichroic film 32A, light in the wavelength region of 430 nm to 470 nm is almost transmitted and light having a wavelength of 510 nm or more is reflected.

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 is efficiently reflected toward the field lens 42 side. Can do. Further, blue light can be guided to the diffusing portion 33T and transmitted toward the field lens 42 side.

As shown in FIG. 13 again, the red and green fluorescence emitted from the red phosphor layer 33R and the green phosphor layer 33G and the blue light diffused by the diffusing unit 33T are used as a field lens 42 as a first collimating means. The light is converted into parallel light fluxes by the collimator lens 41.

The red and green fluorescence and blue light converted into parallel light beams are combined into a light beam having the same optical axis by the combining unit 50 and emitted toward the illumination optical system 200 as illumination light. 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 enters the color prism unit 400 as image light. The image light of each color incident on the color prism unit 400 is synthesized with the same optical axis, passes through the TIR prism unit 300, and is projected onto the screen by the projection optical system 500.

Even in the present embodiment, only one phosphor wheel 30A is provided, and a plurality of fluorescent lights are generated by the phosphor wheel 30A, and the plurality of substantially different advancing directions are mutually generated by the common collimating means. These light beams can be converted into parallel light, and the parallel light can be combined in the same optical path by the combining means 50. Thereby, in the light source device 100A and the projector 600A provided with the same, the etendue is not increased, and the number of components can be reduced and the size can be reduced.

Also, 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 it is possible to use a mirror having a simplified configuration that is easier to manufacture.

In the present embodiment, the case where the blue phosphor layer is omitted from the phosphor wheel by using a 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. An optical laser light source 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, and ultraviolet light is transmitted as the dichroic film 32A, and light having red, green, and blue wavelength ranges is reflected. 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. A 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 configuration up to 500 is different.

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

The light source device 100B differs 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 33 </ b> B, a green phosphor layer 33 </ b> G, and a red phosphor layer 33 </ b> R may be sequentially provided from the center side of the rotating plate 31 toward the radially outer side. In this case, the blue phosphor layer 33 </ b> B is provided so as to surround the drive mechanism 35 provided in the center of the rotating plate 31. The green phosphor layer 33G is provided on the outer side in the radial direction of the blue phosphor layer 33B so as to be adjacent thereto. The red phosphor layer 33R is provided on the outer side in the radial direction of the green phosphor layer 33G so as to be adjacent thereto.

Further, 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 reflecting mirror 51R, the green reflecting mirror 51G, and the like. The blue reflection mirror 51B can be used to synthesize with 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, an overlapping lens 203, and a polarization conversion prism array 207.

The first lens array 201 and the second lens array 202 constitute an integrator optical system. The first lens array 201 divides a fluorescent light beam into a number of light beams by lens cells having a shape substantially similar to the display portions of the liquid crystal panels 470R, 470G, and 470B, and condenses them into the lens cells of the second lens array 202. .

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

Since the second lens array 202 and the phosphor light source are substantially conjugate, a plurality of secondary light source images are formed in the vicinity of the second lens array 202. The polarization conversion prism array 207 is manufactured by joining a prism array with a polarization separation coating, and separates these secondary light source images into two linearly polarized light beams having different polarization directions and reflects them as S-polarized light on the polarization separation surface. Transmits P-polarized light. A phase plate attached on the P-polarized light path of the polarization conversion prism array 207 converts the P-polarized light of the secondary light source image to S-polarized light and converts the illumination light into linearly polarized light. Exit.

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 transmissive dichroic mirror 251R, a blue transmissive dichroic mirror 251B, reflection mirrors 256, 257, and 258, relay lenses 261 and 262, and field lenses 265R, 265G, and 265B.

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

Of the illumination light emitted from the illumination optical system 200B, red light is transmitted through the red transmissive dichroic mirror 251R. The red light transmitted through the red transmitting dichroic mirror 251R is reflected by the reflecting 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 transmission dichroic mirror 251R. Of the green light and blue light reflected by the red transmissive dichroic mirror 251R, 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 portion of the liquid crystal panel 470G for green light.

Of the green light and blue light reflected by the red transmissive dichroic mirror 251R, the blue light is transmitted through the blue transmissive dichroic mirror 251B, and sequentially passes through the relay lens 261, the reflective mirror 257, the relay lens 262, and the reflective mirror 258, and then the 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 optical path length of the blue light is longer than the optical path lengths of the other colors, equal-magnification relay lenses 261 and 262 (relay optical systems) are arranged so that the conditions are equivalent to those of the other color lights. ing.

In addition, the field lenses 265R, 265G, and 265B make the illumination light separated into colors into telecentric light beams, and substantially uniform illumination light including incident angle characteristics is incident on the liquid crystal panels 470R, 470G, and 470B. To do.

The liquid crystal panels 470R, 470G, and 470B display an image of each color light on the display unit according to the image information. Liquid crystal panels 470R, 470G, and 470B are sandwiched between polarizing plates (not shown). The incident-side polarizing plates, the liquid crystal panels 470R, 470G, and 470B and the outgoing-side polarizing plates modulate the light of each color incident on each pixel, and only light in a specific polarization direction is input to the cross dichroic prism 480 as image light. It is injected towards.

The cross dichroic prism 480 combines the image light emitted from the liquid crystal panels 470R, 470G, and 470B with 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 formed of a dielectric multilayer film.

The red image light incident on the cross dichroic prism 480 is reflected by the red reflecting surface 481R and emitted from the emitting surface 480a. The blue image light incident on the cross dichroic prism 480 is reflected by the blue reflecting surface 481B and is emitted from the emission surface 480a. The green image light incident on the cross dichroic prism 480 passes through the red reflecting surface 481R and the blue reflecting surface 481B and is emitted from the exit surface 480a. As a result, the red image light, the blue image light, and the green image light are combined and emitted as an image from the emission surface 480 a 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 a laser light source is used, the lifetime can be extended.

In addition, since light source device 100B according to the present embodiment is substantially the same as the configuration of light source device 100 according to the first embodiment, the same effects as in 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 portions are the red reflection mirror 51R, the green reflection mirror 51G, and the blue. It can be changed as appropriate by adjusting the optical system such as the order of the reflection mirrors 51R.

In the light source device according to the first embodiment, the phosphor wheel according to the third embodiment may be used. In the light source device according to the third embodiment, the phosphor wheel according to the first embodiment is used. Also good. Thus, when there are a plurality of embodiments, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified.

As mentioned above, although embodiment of this invention was described, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all changes 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, 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 diffuser, 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 1st lens array, 201a, 202a lens cell, 202 2nd lens array, 203 superposed lens, 204 folding mirror, 205 entrance lens, 207 polarization conversion prism array, 250 color separation optical system, 251B blue transmissive dichroic mirror, 251R Red transmissive 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 entrance surface, 411g, 412g, 413g air gap layer, 420R red prism, 420B blue prism 420G green prism, 421B, 421R slope, 422B blue dichroic surface, 422R red dichroic surface, 423B, 423G, 423R prism end surface, 470B, 470G, 470R liquid crystal panel, 480 cross dichroic prism, 480a exit surface, 481B blue reflecting surface, 481R Red reflecting surface, 500 projection optical system, 600, 600A, 600B projector.

Claims (10)

1. An excitation light source that emits excitation light for exciting fluorescence;
   A plurality of phosphor layers arranged on the surface of the substrate and emitting the fluorescence having different wavelength ranges 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 phosphor layers and having different wavelength ranges into a plurality of parallel lights having different traveling directions;
   A light source apparatus comprising: a combining unit configured to combine the plurality of parallel lights having different traveling directions into the same optical path.
2. 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 and converting the excitation light emitted from the laser light sources into a plurality of parallel light flux groups having different traveling directions;
   2. The light source device according to claim 1, further comprising a condensing unit configured to condense each of the plurality of parallel light flux groups converted by the second collimating unit on each of the plurality of phosphor layers.
3. 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 2, wherein the first collimating unit and the light collecting unit are configured by the same member.
4. The synthesizing unit includes a plurality of dichroic filters disposed between the second collimating unit and the condensing unit in the optical path of the excitation light and transmitting the excitation light and reflecting fluorescence in a corresponding wavelength range. The light source device according to claim 2 or 3.
5. The light source device according to claim 4, wherein the plurality of dichroic filters are arranged so as to sequentially reflect the plurality of parallel lights having different wavelength ranges from a wavelength band on a long wavelength side.
6. The plurality of parallel lights having different wavelength ranges have red, green, and blue wavelength ranges,
   The light source device according to claim 1, wherein a wavelength of the excitation light is shorter than that of the parallel light having a blue wavelength region.
7. The surface of the substrate is configured to reflect the fluorescence emitted from the plurality of phosphor layers toward the first collimating means. Light source device.
8. The plurality of phosphor layers are formed in a ring shape,
   The light source device according to claim 1, wherein the substrate is configured to be rotatable.
9. The light source device according to any one of claims 1 to 8,
   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 that are provided corresponding to the respective color lights separated by the color separation means and display images of the respective color lights;
   Color synthesizing means for synthesizing each of the image light modulated according to the image by the plurality of image display elements on the same optical axis;
   And a projection system for projecting the image light synthesized by the color synthesizing means.
10. The image display element is a reflective display element,
    The projector according to claim 9, wherein the color separation unit and the color composition unit are configured by the same member.

Images