JP2019207394A - Light source device and projection type video display device - Google Patents

Abstract

To provide a light source device which can synthesize beams from three or more light source units and achieve increased luminance and a reduced size.SOLUTION: The light source device comprises: a first and a second light source unit created by arraying a plurality of light source elements so as to emit s-polarized light, and arranged facing each other in emitting directions; a third light source unit created by arraying a plurality of light source elements so as to emit p-polarized light, and arranged so that the p-polarized light is emitted in a direction orthogonal to the light emitting directions of the first and second light source units; a polarizing beam splitter (PBS) for reflecting the s-polarized light of the first light source unit toward the same direction as the emitted light of the third light source unit, reflecting the s-polarized light of the second light source unit toward the third light source unit, and transmitting the p-polarized light; and a polarization conversion element arranged between the PBS and the third light source unit and composed of a transparent substrate having an opening for transmitting the p-polarized light of the third light source unit.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a light source device that synthesizes and emits light beams from a plurality of light source arrays (light source units), and a projection display apparatus using the same.

  Miniaturization is required for projectors. To achieve miniaturization, the light beam diameter is reduced by narrowing the interval between light sources, the optical system at the subsequent stage is reduced, and light from multiple light sources is combined in a space-saving manner. It is possible to do. However, if the interval between the light sources is narrowed, the cooling performance by the heat sink decreases, the heat radiation of the light source becomes insufficient, and the light source may be damaged. In addition, in a light combining method using a reflective material such as a mirror, only a light from two directions can be combined with a single reflective material, so that the light combining unit becomes large.

  Patent Document 1 discloses an illumination device (light source device) for a projection video display device (projector). The illumination device disclosed in Patent Document 1 includes a first light source array that is arranged at a predetermined interval in a first direction parallel to a predetermined plane and emits light in the same direction parallel to the predetermined plane, and is parallel to the predetermined plane. A second light source array arranged at a predetermined interval in the second direction and emitting light in the same direction intersecting with the light from the first light source array; and a passing region for allowing the light from the first light source array to pass through And a light combining member in which reflection regions for reflecting light from the second light source array are alternately arranged. The light combining member is configured such that light from the first light source array enters the passage region, light from the second light source array enters the reflection region, and light from the first light source array that has passed through the passage region. It arrange | positions so that the light from the 2nd light source array reflected by the reflection area may go to the same direction.

JP 2010-102049 A

  The present disclosure provides a light source device and a projection-type image display device that can synthesize light beams from a plurality of light source units appropriately to achieve high brightness and downsizing.

  The light source device according to the present disclosure includes a first light source unit that emits first linearly polarized light in a first direction and a first light source unit that is opposed to the first light source unit, and the first linearly polarized light is opposite to the first direction. The second light source unit that emits in the second direction, and is disposed between the first light source unit and the second light source unit, reflects the first linearly polarized light, and is orthogonal to the first linearly polarized light. A first polarization beam splitter that transmits certain second linearly polarized light; and a polarization conversion element that includes a transparent substrate having a quarter-wave coat on one surface and a reflective coat on the other surface. The first linearly polarized light emitted from the first light source unit is reflected by the first polarization beam splitter in a third direction orthogonal to the first and second directions. The first linearly polarized light emitted from the second light source unit is reflected by the first polarization beam splitter in the fourth direction opposite to the third direction, and converted into the second linearly polarized light by the polarization conversion element. And reflected in the third direction.

  The light source device and the projection display device according to the present disclosure can achieve high brightness and downsizing by combining light beams of a plurality of light source units.

1 is a diagram illustrating a configuration of a projector according to a first embodiment. The figure which shows the fluorescent substance wheel apparatus in the illumination optical system concerning Embodiment 1 The figure which shows the structure of the light source device concerning Embodiment 1. FIG. The figure which shows the structure of the light source unit concerning Embodiment 1. FIG. The figure which shows the structure of the polarization converting element concerning Embodiment 1. FIG. The figure which shows the light transmissive area | region on the polarization beam splitter concerning Embodiment 1. FIG. The figure which shows the structure of the light source device concerning Embodiment 2. FIG. The figure which shows the structure of the phase difference plate concerning Embodiment 2. FIG. The figure which shows the light transmissive area | region on the polarization beam splitter concerning Embodiment 2. FIG. The figure which shows the structure of the light source device concerning Embodiment 3. FIG. The figure which shows the structure of the polarization beam splitter concerning Embodiment 3. FIG. The figure which shows the light transmissive area | region on the polarization beam splitter concerning Embodiment 3. FIG.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The inventor provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the subject matter described in the claims. Absent.

(Embodiment 1)
The first embodiment will be described below with reference to FIGS. Hereinafter, a projector will be described as a specific embodiment of the projection display apparatus according to the present disclosure.

[1-1. Constitution]
[1-1-1. Projector Configuration]
FIG. 1 is a diagram illustrating a configuration of a projector according to the first embodiment. The projector 1 includes a light source device 11, an illumination optical system 20, an image generation unit 30, and a projection optical system 40. Further, FIG. 1 shows an XYZ orthogonal coordinate system, and the same XYZ orthogonal coordinate system is also shown in the drawings subsequent to FIG. 2 as appropriate.

  The projector 1 guides the light emitted from the light source device 11 to the video generation unit 30 by the illumination optical system 20 and uses a digital micromirror device (hereinafter referred to as “DMD”) in the video generation unit 30 from the control unit. Video light is generated by modulating in accordance with the video signal. The projector 1 projects the generated image light onto a screen or the like by the projection optical system 40. Hereinafter, the configuration of each part will be described in detail.

  The light source device 11 is composed of a plurality of semiconductor lasers, and generates a light beam in which laser light is two-dimensionally arranged. Details of the light source device 11 will be described later.

  The illumination optical system 20 guides the light beam from the light source device 11 to the image generation unit 30. The light from the light source device 11 is collected by the condensing lens 200, passes through the diffusion plate 201, and then collimated by the collimating lens 202. The parallel light is reflected in the −X direction by the dichroic mirror 203 and is collected on the phosphor wheel device 230.

  The diffusion plate 201 is a flat glass, and has a fine uneven shape on one side or both sides. The dichroic mirror 203 has a characteristic of reflecting blue light and transmitting light in other wavelength ranges.

  As shown in the front view of FIG. 2 (a) and the side view of FIG. 2 (b), the phosphor wheel device 230 has a disk-like shape that is rotationally driven around the rotation axis of the motor 231 and the motor 231. It is comprised with the rotating base material 232 which consists of a plate body. One surface of the rotating base material 232 is mirror-finished, and one surface thereof is a circle separated by a distance R from the rotational axis center A of the phosphor wheel as shown in the front view of FIG. On the circumference, a red phosphor portion 233R, a green phosphor portion 233G, and an opening portion 233B are formed with a predetermined width W inside and outside the circumference.

  When the laser light from the light source device 11 is condensed on the red phosphor portion 233R of the phosphor wheel device 230, the phosphor of the red phosphor portion 233R is excited and emits red light. Further, when the laser light from the light source device 11 is condensed on the green phosphor portion 233G of the phosphor wheel device 230, the phosphor of the green phosphor portion 233G is excited and emits green light. Further, the laser light from the light source device 11 that is focused on the opening 233 </ b> B of the phosphor wheel device 230 passes through the phosphor wheel device 230.

  Returning to FIG. 1, red light and green light obtained by the phosphor wheel device 230 are emitted from the phosphor wheel device 230 in the + X direction. The fluorescent light emitted in the −X direction by the red phosphor portion 233R and the green phosphor portion 233G is reflected by the one surface of the rotating base material 232 and emitted in the + X direction. These red light and green light are collimated by the lens 204, pass through the dichroic mirror 203, condensed by the condenser lens 212, and enter the rod integrator 213.

  On the other hand, the blue light of the blue semiconductor laser that has passed through the opening 233B travels along the path of the lens 205, mirror 206, lens 207, mirror 208, lens 209, mirror 210, and lens 211, is reflected by the dichroic mirror 203, and is condensed. The light is condensed by the lens 212 and enters the rod integrator 213. The lenses 207, 209, and 211 function as relay lenses.

  The rod integrator 213 is a solid rod made of a transparent member such as glass. The rod integrator 213 generates light with a uniform light intensity distribution by internally reflecting the incident light a plurality of times. The rod integrator 213 may be a hollow rod whose inner wall is constituted by a mirror surface.

  The light emitted from the rod integrator 213 passes through the lens 214, the lens 215, and the lens 216, and enters a TIR (total internal reflection) prism 303, which is a pair of prisms of the first prism 301 and the second prism 302, and the light. The incident light is modulated by the video signal by the DMD 300 serving as a modulation element and emitted as the video light P. The lenses 214, 215, and 216 are relay lenses that substantially image the emitted light from the rod integrator 213 on the DMD 300 in the image generation unit 30.

  The outgoing light from the DMD 300 is incident on the projection optical system 40, and the projection optical system 40 projects the video light from the video generation unit 30 onto, for example, a screen. The projection optical system 40 includes a lens for adjusting focus, zoom, and the like.

[1-1-2. Configuration of light source device]
Hereinafter, the configuration of the light source device 11 will be described in detail with reference to FIGS. FIG. 3 is a diagram illustrating a configuration of the light source device according to the first embodiment. In FIG. 3, the optical path is indicated by an arrow. In FIG. 3, a direction that forms an angle of 45 degrees with respect to the X direction and the Z direction is shown as the W direction. The light source device 11 includes a first light source unit 100A, a second light source unit 100B, a third light source unit 100C, a polarization beam splitter 110, and a polarization conversion element 120.

  The configuration of the first light source unit 100A to the third light source unit 100C is shown in FIG. Since the first light source unit 100A to the third light source unit 100C have the same configuration, they are shown as the light source unit 100 in FIG. 4A is a front view of the light source unit, and FIG. 4B is a cross-sectional view at a cutting position indicated by a cutting line 4b in FIG. Within the light emitting surface of the light source unit, there are a plurality of light source elements 101 arranged in an array at a predetermined pitch. In this embodiment, the light source elements 101 are arranged in a 4 × 4 matrix. For example, a semiconductor laser is used as the light source element. The light emitted from each light source element 101 becomes substantially parallel light and is emitted from the light source unit 100 by the collimator lens 102. A portion where the light source element 101 and the collimating lens 102 are disposed is referred to as a light source element portion 103. The arrows in FIG. 3 represent light emitted from one light source element among the plurality of light source elements in each of the first light source unit 100A to the third light source unit 100C.

  The first light source unit 100A and the second light source unit 100B are arranged to face each other with the polarization beam splitter (PBS) 110 interposed therebetween so that the optical axes of the emitted light of each light source element coincide with each other, and are each in the −X direction (first direction). ) And + X direction (corresponding to the third direction). The third light source unit 100C is disposed facing the −Z direction (corresponding to the third direction), and the polarization conversion element 120 is disposed between the polarization beam splitter 110 and the third light source unit 100C. In this way, the third light source unit 100C is arranged so that light is emitted in a direction orthogonal to the light emission direction from the first light source unit 100A and the second light source unit 100B.

  From the first light source unit 100A and the second light source unit 100B, the light source element 101 is arranged so that S-polarized light, which is the first linearly polarized light reflected by the polarization beam splitter 110, is emitted. . Further, the third light source unit 100C emits P-polarized light that is transmitted through the polarization beam splitter 110 and is second linearly polarized light that is orthogonal to the first linearly polarized light. Element 101 is arranged.

  The polarization direction of light emitted from each light source unit is arranged such that the first light source unit 100A and the second light source unit 100B are parallel to the Y direction, and the third light source unit 100C is parallel to the X direction.

  Details of the polarization conversion element 120 are shown in FIG. As shown in the plan view of FIG. 5A, the polarization conversion element 120 is divided into an opening region 121 (shaded region) formed on a transparent glass substrate and a non-opening region 122. In the non-opening region 122, as shown in the side view of FIG. 5B, a quarter wavelength coat is applied to one surface 123, and a reflection coat is applied to the other surface 124 as a mirror surface. ing. The quarter wavelength coat has a role of shifting the phases of two polarization components that are perpendicular to each other, and the slow axis is arranged in parallel to the θa direction rotated 45 degrees from the Y direction. Further, the θb direction shown in FIG. 5A indicates the direction of the fast axis. The polarization conversion element 120 is disposed such that the surface 123 with the quarter wavelength coating faces the polarization beam splitter 110 and the surface 124 with the reflection coating faces the third light source unit 100C. .

[1-2. Operation of light source device]
Hereinafter, the polarization direction reflected to the polarization beam splitter 110 is referred to as the S direction, and the transmission polarization direction is referred to as the P direction, and linearly polarized light oscillating along these directions is referred to as S polarization and P polarization, respectively.

  Since the light beam LA emitted from the first light source unit 100A has S-polarized light, it is reflected by the polarizing beam splitter 110 in the −Z direction. The light beam LC emitted from the third light source unit 100C passes through the aperture region 121 of the polarization conversion element 120, has P-polarized light, passes through the polarization beam splitter 110, and travels in the −Z direction. Since the light beam LB emitted from the second light source unit 100B has S-polarized light, it is reflected in the + Z direction (corresponding to the fourth direction) by the polarization beam splitter 110 and enters the non-opening region 122 of the polarization conversion element 120. The light beam LB incident on the non-opening region 122 becomes circularly polarized light when passing through the surface 123, and becomes P-polarized light when reflected by the surface 124 and then again through the surface 123. Thereafter, the light beam LB passes through the polarization beam splitter 110 and travels in the −Z direction.

  FIG. 6 shows the transmission regions of the light beams LA, LB, and LC on the polarization beam splitter 110. The light beams LA and LB are reflected or transmitted through the same transmission region (region indicated by black circles in FIG. 6), and the light beam LC is transmitted between the transmission regions of the light beams LA and LB (regions indicated by white circles in FIG. 6). .

[1-3. Effect]
As described above, the total luminous flux emitted from the light source device 11 in the present embodiment has a small luminous flux diameter because the luminous fluxes LA and LB overlap and the luminous flux LC enters the gap between the luminous fluxes LA and LB. Therefore, the illumination optical system 20 becomes small, and the projector 1 can be miniaturized. Further, since the light source unit combines light beams from three directions, the light source unit can be downsized as compared with the conventional configuration from two directions.

(Embodiment 2)
The second embodiment will be described below with reference to FIGS. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description thereof is omitted.

  FIG. 7 shows the configuration of the light source device 12 according to the second embodiment. In the light source device 12, the first light source unit 100 </ b> A and the second light source unit 100 </ b> B are arranged facing the X direction with the polarizing beam splitter 110 interposed therebetween, but are also arranged so as to be shifted by a half pitch between the light source elements in the Y direction. This is different from the light source device 11 of the first embodiment. In addition, the phase difference plate 130 is disposed in the vicinity of the emission port of the light source device 12.

  The configuration of the phase difference plate 130 is shown in FIG. FIG. 8A is a front view, and FIG. 8B is a side view. The phase difference plate 130 has an opening area 131 (a shaded area) and a non-opening area 132 provided on a transparent glass substrate, and the surface 133 of the non-opening area 132 has a ½ wavelength coating. The slow axis is arranged in parallel with the θa direction rotated 45 degrees from the Y direction. The surface 133 is disposed so as to face the third light source unit 100C side.

  Returning to FIG. 7 again, the operation will be described. The S-polarized light beam LA from the first light source unit 100 </ b> A is reflected by the polarizing beam splitter 110 in the −Z direction and is incident on the non-opening region 132 of the phase difference plate 130. At that time, the polarization direction of the light beam LA is converted from S-polarized light to P-polarized light and proceeds in the −Z direction. The P-polarized light beam LC from the third light source unit 100C passes through the aperture region 121 of the polarization conversion element 120, passes through the polarization beam splitter 110, passes through the aperture region 131 of the phase difference plate 130, and proceeds in the −Z direction. The S-polarized light beam LB from the second light source unit 100B is reflected in the + Z direction by the polarization beam splitter 110, converted to P-polarized light by the polarization conversion element 120, and reflected in the −Z direction. Thereafter, the light passes through the polarizing beam splitter 110, passes through the opening region 131 of the phase difference plate 130, and proceeds in the −Z direction. A transmission region of each light beam on the polarization beam splitter 110 is shown in FIG. In the present embodiment, light beams LA (circles with horizontal stripes), LB (circles with vertical stripes), and LC (white circles) pass through different regions on the polarization beam splitter 110.

  As described above, similarly to the light source device 11 of the first embodiment, the light source device 12 of the second embodiment can further align the polarization directions of the light beams LA, LB, and LC while obtaining the advantage of downsizing. it can. Further, the light source device 12 can be employed as the light source device of the projector 1.

(Embodiment 3)
Hereinafter, Embodiment 3 will be described with reference to FIGS. FIG. 10 shows the configuration of the light source device 13 according to the third embodiment. The light source device 13 includes a first light source unit 100A, a second light source unit 100B, a third light source unit 100C, a fourth light source unit 100D, a first polarizing beam splitter 110A, a second polarizing beam splitter 110B, and a collimating lens 140. , 150 and the polarization conversion element 160.

  Each structure of the first light source unit 100A to the fourth light source unit 100D is the same as that of the light source unit 100 shown in FIG. The first light source unit 100A and the second light source unit 100B are disposed so as to face each other with the first polarizing beam splitter 110A disposed therebetween so that the optical axes in the X direction of the light emitted from the light source elements are aligned. The third light source unit 100C and the fourth light source unit 100D face each other with the second polarizing beam splitter 110B disposed therebetween so that the optical axes in the X direction of the light emitted from the light source elements are aligned. Are arranged.

  The first light source unit 100A to the fourth light source unit 100D are arranged so that the emitted light has S polarization with respect to each polarization beam splitter.

  FIG. 11 shows the configuration of the first polarizing beam splitter 110A. FIG. 11A is a front view, and FIG. 11B is a side view. The first polarizing beam splitter 110A includes an opening area 111A (corresponding to a first opening for transmitting light) and a non-opening area 112A, and one surface 113A of the non-opening area 112A reflects S-polarized light. Then, a beam splitter coat that transmits P-polarized light is applied. Although not shown, the second polarizing beam splitter 110B is also composed of an opening area (corresponding to the second opening for light transmission) and a non-opening area. A beam splitter coat that reflects polarized light and transmits P-polarized light is applied. When viewed in the Z direction, the aperture direction and the non-aperture region of the second polarization beam splitter 110B do not overlap the aperture region and the non-aperture region of the first polarization beam splitter 110A, respectively. Will be deployed. The first polarizing beam splitter 110A and the second polarizing beam splitter 110B are arranged so that one surface side on which the beam splitter coating is applied is the collimating lens 140 side.

  The polarization conversion element 160 is made of a transparent substrate having a quarter wavelength coat on the surface facing the collimator lens 150 and a reflective coat on the opposite surface.

  Returning to FIG. 10 again, the operation will be described. The S-polarized light beam LA emitted from the first light source unit 100A is reflected in the −Z direction by the non-opening region 112A of the first polarizing beam splitter 110A. The S-polarized light beam LC emitted from the third light source unit 100C is reflected by the non-opening region of the second polarizing beam splitter 110B, travels in the −Z direction through the opening region 111A of the first polarizing beam splitter 110A. To do.

  The S-polarized light beam LD emitted from the fourth light source unit 100D is reflected in the + Z direction by the non-opening region of the second polarizing beam splitter 110B, the light beam diameter is reduced by the collimating lenses 140 and 150, and the polarization conversion element 160 is reflected. Is converted into P-polarized light by the polarization conversion element 160. The light beam LD converted to P-polarized light again enters the collimating lenses 140 and 150, and the light beam diameter is enlarged. Thereafter, the light passes through the non-opening region of the second polarizing beam splitter 110B, passes through the opening region 111A of the first polarizing beam splitter 110A, and proceeds in the −Z direction.

  The S-polarized light beam LB emitted from the second light source unit 100B is reflected in the + Z direction by the non-opening region 112A of the first polarizing beam splitter 110A, passes through the opening region of the second polarizing beam splitter 110B, and passes through the collimating lens. 140 is incident. Thereafter, after being converted to P-polarized light in the same manner as the light beam LD, the light passes through the opening region of the second polarizing beam splitter 110B, passes through the non-opening region 112A of the first polarizing beam splitter 110A, and proceeds in the −Z direction. .

  FIG. 12 shows a transmission region of the light beams LA to LD on the first polarizing beam splitter 110A. The light beams LA and LB are reflected or transmitted by the non-opening region 112A, and LC and LD pass through the opening region 111A.

  As described above, in the light source device 13 according to the third embodiment, since the polarization conversion element 160 is smaller than the light source devices according to the first and second embodiments, the cost can be reduced. Further, the light source device 13 can be employed as the light source device of the projector 1.

(Other embodiments)
As described above, Embodiments 1 to 3 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. Moreover, it is also possible to combine each component demonstrated in the said Embodiment 1-3 and it can also be set as new embodiment. Therefore, other embodiments will be exemplified below.

  (1) In the first embodiment, the light source device 11 including the three light source units 100A to 100C, the polarization beam splitter 110, and the polarization conversion element 120 has been described. This indication is not limited to this, It is applicable to the form provided with n light source units and n-1 photosynthesis boards. Note that n is an integer of 3 or more.

  (2) Moreover, the polarization conversion element in Embodiment 1-3 may take the structure which bonded the retardation film to the glass plate.

  (3) The light source units in the first to third embodiments have a matrix configuration in which a total of 16 light sources are arranged in 4 rows and 4 columns, but the number and arrangement of the light sources are not limited to this.

  (4) In the first and second embodiments, the light source device including the three light source units 100A to 100C has been described. The present disclosure is not limited to this, and the light source device may be configured by two light source units 100A and 100B. That is, the light source unit 100C can be omitted in the light source devices 11 and 12, and in this case, the opening region 121 of the polarization conversion element 120 can also be omitted.

  (5) In the third embodiment, the light source device 13 including the four light source units 100A to 100D and the two polarization beam splitters 110A and 110B has been described. The present disclosure is not limited to this, and it is also possible to configure a light source device using a total of eight light source units and four polarizing beam splitters using four light source units and two polarizing beam splitters having the same configuration. is there. That is, four newly added light source units and two polarization beam splitters are arranged on the −Z direction side of the light source device 13 of the third embodiment. In this case, the optical axes of the light source elements of the added four light source units are arranged so as to be shifted by a half pitch in the Y direction with respect to the four light source units 100A to 100D. In addition, the two additional polarizing beam splitters are provided with openings through which the light beams from the four light source units 100A to 100D pass, and the two polarizing beam splitters 110A and 110B receive the light beams from the added light source unit. An opening for passing through may be provided.

  As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  The present disclosure can be applied to a light source device that combines and uses light from a plurality of light sources, and a projection display apparatus using the light source device.

DESCRIPTION OF SYMBOLS 1 Projector 11, 12, 13 Light source device 20 Illumination optical system 30 Image | video production | generation part 40 Projection optical system 100, 100A, 100B, 100C, 100D Light source unit 101 Light source element 102 Collimating lens 103 Light source element part 110 Polarizing beam splitter 110A 1st Polarization beam splitter 110B Second polarization beam splitter 111A Aperture region 112A Non-aperture region 113A surface 120 Polarization conversion element 121 Aperture region 122 Non-aperture region 123, 124 surface 130 Phase plate 131 Open region 132 Non-aperture region 133 surface 140, 150 Collimating lens 160 Polarization conversion element 200 Condensing lens 201 Diffuser plate 202 Collimating lens 203 Dichroic mirror 204, 205, 207, 209, 211, 214, 215, 21 6 Lens 206, 208, 210 Mirror 212 Condensing lens 213 Rod integrator 230 Phosphor wheel device 231 Motor 232 Rotating substrate 233R Red phosphor part 233G Green phosphor part 233B Opening 301 First prism 302 Second prism 303 prism

Claims (5)

A first light source unit that emits first linearly polarized light in a first direction;
A second light source unit disposed opposite to the first light source unit and emitting the first linearly polarized light in a second direction opposite to the first direction;
Arranged between the first light source unit and the second light source unit, reflects the first linearly polarized light, and transmits the second linearly polarized light that is orthogonal to the first linearly polarized light. A first polarizing beam splitter;
A polarization conversion element comprising a transparent substrate having a quarter wavelength coat on one side and a reflective coat on the other side,
The first linearly polarized light emitted from the first light source unit is reflected by the first polarizing beam splitter in a third direction orthogonal to the first and second directions,
The first linearly polarized light emitted from the second light source unit is reflected by the first polarizing beam splitter in a fourth direction opposite to the third direction, and the second light is reflected by the polarization conversion element. A light source device that is converted into linearly polarized light and reflected in the third direction. A third light source unit that emits the second linearly polarized light in the third direction;
The first polarization beam splitter has an opening through which the second linearly polarized light from the third light source unit passes.
The light source device according to claim 1. A retardation plate that is disposed at an emission port of the light source device, has an opening through which the second linearly polarized light passes, and includes a transparent substrate having a ½ wavelength coat on one surface;
The light source device according to claim 1. A third light source unit that emits the first linearly polarized light in the first direction;
A fourth light source unit disposed opposite to the third light source unit and emitting the first linearly polarized light in the second direction;
The second light source unit is disposed between the third light source unit and the fourth light source unit, has a second opening for transmitting light, reflects the first linearly polarized light, and transmits the second linearly polarized light. A second polarizing beam splitter;
The first polarizing beam splitter has a first opening for transmitting light,
The first linearly polarized light emitted from the second light source unit is reflected in the fourth direction by the first polarizing beam splitter and passes through the second opening of the second polarizing beam splitter. And converted into the second linearly polarized light by the polarization conversion element and reflected in the third direction,
The first linearly polarized light emitted from the third light source unit is reflected in the third direction by the second polarizing beam splitter and passes through the first opening of the first polarizing beam splitter. And
The first linearly polarized light emitted from the fourth light source unit is reflected in the fourth direction by the second polarization beam splitter, and converted into the second linearly polarized light by the polarization conversion element. Reflected in the third direction,
The light source device according to claim 1.   A projection display apparatus comprising the light source device according to claim 1.