WO2016067822A1 - 光源装置及びプロジェクタ - Google Patents
光源装置及びプロジェクタ Download PDFInfo
- Publication number
- WO2016067822A1 WO2016067822A1 PCT/JP2015/077817 JP2015077817W WO2016067822A1 WO 2016067822 A1 WO2016067822 A1 WO 2016067822A1 JP 2015077817 W JP2015077817 W JP 2015077817W WO 2016067822 A1 WO2016067822 A1 WO 2016067822A1
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- WIPO (PCT)
- Prior art keywords
- light source
- light
- source device
- unit
- mirror
- Prior art date
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
- F21V14/04—Controlling the distribution of the light emitted by adjustment of elements by movement of reflectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
- F21V7/09—Optical design with a combination of different curvatures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3152—Modulator illumination systems for shaping the light beam
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3158—Modulator illumination systems for controlling the spectrum
Definitions
- the present disclosure relates to a light source device and a projector.
- the light source unit 110 emits substantially parallel light in a predetermined wavelength band.
- the light source unit 110 includes at least one LD that is a solid-state light source and at least one collimator lens that makes light emitted from the LD substantially parallel.
- the light source unit 110 includes, for example, a plurality of combinations of LDs and collimator lenses arranged in a predetermined direction. In FIG. 1, light from each of the plurality of LDs is typically illustrated by a single solid line.
- an LD that emits laser light in a blue band (wavelength band of about 400 (nm) to 500 (nm)) is used as the light source unit 110.
- the first embodiment is not limited to such an example.
- the light from the light source unit 110 is used as excitation light that causes the phosphor of the phosphor wheel 140 to emit light. Therefore, the performance of the LD constituting the light source unit 110 may be appropriately selected according to the characteristics of the fluorescence desired to be obtained, that is, according to the characteristics of the phosphor used.
- the direction in which the light source unit 110 emits light is defined as the Z-axis direction.
- Two directions orthogonal to each other in a plane perpendicular to the Z-axis direction are defined as an X-axis direction and a Y-axis direction.
- the LDs constituting the light source unit 110 are arranged in one or more rows in the Y-axis direction.
- the light guide unit 120 guides light from the light source unit 110 toward the phosphor wheel 140.
- the light guide unit 120 includes a concave mirror 121 and a convex mirror 122. As shown in the drawing, light from the light source unit 110 is reflected in this order by the concave mirror 121 and the convex mirror 122 and guided toward the phosphor wheel 140.
- the concave mirror 121 is a plate-like member having a substantially rectangular shape, and is disposed so that the reflection surface thereof faces the light source unit 110.
- the concave mirror 121 is formed so that its reflection surface has a paraboloid, and reflects light from the light source unit 110 toward the convex mirror 122. Since the reflecting surface of the concave mirror 121 is a paraboloid, the light from the plurality of LDs of the light source unit 110 can be more efficiently collected on the convex mirror 122.
- a predetermined position on the reflecting surface of the convex mirror 122 in the first embodiment
- the function of condensing light can be realized.
- the shape of the concave mirror 121 is not limited to this example.
- the shape and characteristics of the concave mirror 121 include the arrangement position of the LD constituting the light source unit 110, the size and incident angle of the light beam incident on the concave mirror 121, the position of the condensing spot 143 on the phosphor wheel 140 described later, and It can be set as appropriate in consideration of the size and the like.
- the reflecting surface of the concave mirror 121 may be a spherical surface or other free-form surface.
- the shape of the concave mirror 121 is not limited to a substantially rectangular shape, and the concave mirror 121 may be formed to cover the light source unit 110 in a bowl shape, for example.
- the configuration of the concave mirror 121 can be further reduced, and the entire light source device 10 can be further reduced in size.
- the shape of the convex mirror 122 is not limited to the example described above.
- the shape and characteristics of the convex mirror 122 include the positional relationship with the concave mirror 121, the size and incident angle of the light beam incident on the convex mirror 122, the position and size of the condensing spot 143 on the phosphor wheel 140 described later, and the like. It can be set as appropriate in consideration.
- the reflecting surface of the convex mirror 122 may be an aspherical surface.
- the convex mirror 122 may not be substantially hemispherical.
- At least one of the reflecting surfaces of the concave mirror 121 and the convex mirror 122 is preferably aspherical.
- the reflecting surface of the concave mirror 121 and the convex mirror 122 is an aspherical surface and the reflecting surface of the convex mirror 122 is a spherical surface. In this case, since the commercially available spherical mirror can be used as the convex mirror 122, the manufacturing cost can be reduced.
- the light source device 10 may be provided with an adjustment mechanism for adjusting the position of the convex mirror 122 in the three-axis directions (X-axis direction, Y-axis direction, and Z-axis direction).
- the adjustment mechanism is configured to have a function of translating the convex mirror 122 in three axial directions.
- the adjustment mechanism may be configured by an actuator including a driving device such as a motor, and the position of the convex mirror 122 may be moved electrically.
- the adjustment mechanism may be configured by combining a transmission member such as a gear, and the position of the convex mirror 122 may be mechanically moved manually.
- the phosphor wheel 140 includes a disc-shaped substrate 141 and a phosphor (not shown) provided on the substrate 141.
- the phosphor wheel 140 is disposed so that the surface of the substrate 141 on which the phosphor is provided faces the light guide unit 120 (that is, faces the negative direction of the Z axis).
- a motor 142 that drives the phosphor wheel 140 is connected to the center of the substrate 141, and the phosphor wheel 140 can rotate with a normal passing through the center of the substrate 141 as a rotation axis.
- the phosphor provided in the phosphor wheel 140 functions as a light emitter that is excited by light from the light source unit 110 and emits fluorescence in a longer wavelength band than the wavelength of the light.
- the phosphor is a YAG (yttrium, aluminum, garnet) phosphor, which is excited by light in the blue band from the light source unit 110 and emits light in the green band to the red band.
- the phosphor wheel 140 according to the first embodiment is a reflection type phosphor wheel, and light from the phosphor is emitted toward the incident direction of light from the light source unit 110 (that is, the negative direction of the Z axis).
- the first embodiment is not limited to such an example, and the phosphor of the phosphor wheel 140 may be various known types so that light in a desired wavelength band can be obtained according to the use of the light source device 10 or the like.
- the following phosphors may be used.
- the light emission characteristics of the phosphor may be deteriorated due to heat generated by the light irradiation.
- the relative position of the condensing spot 143 on the phosphor wheel 140 is always changed. Degradation of body performance can be avoided.
- the condensing unit 130 has a function of condensing the light guided from the light guide unit 120 onto the condensing spot 143 and is emitted from the phosphor of the phosphor wheel 140. It has a function of collecting fluorescence. Therefore, the optical design of the light collecting unit 130 is performed so that the light collecting unit 130 suitably realizes these two functions.
- the light collecting unit 130 is preferably arranged as close to the phosphor wheel 140 as possible. By arranging the condensing unit 130 close to the phosphor wheel 140, it is possible to collect the fluorescence emitted from the phosphor of the phosphor wheel 140 more efficiently and improve the use efficiency of the fluorescence. Can be made.
- the spectroscopic unit 150 is provided on the optical path of light from the light guide unit 120 toward the phosphor wheel 140.
- the spectroscopic unit 150 transmits light in a wavelength band corresponding to the light from the light source unit 110 and reflects light in a wavelength band corresponding to fluorescence emitted from the phosphor of the phosphor wheel 140. Consists of dichroic mirrors.
- the first embodiment is not limited to this example, and the spectroscopic unit 150 can be configured by any optical member having a function of separating light from the light source unit 110 and fluorescence from the phosphor wheel 140.
- the light source device 10 includes a light guide unit 120, a spectroscopic unit 150, a condensing unit 130, and a phosphor wheel 140 arranged in this order in a substantially line in the Z-axis direction.
- the light from the light source unit 110 is guided in the positive direction of the Z axis by the light guide unit 120, then passes through the spectroscopic unit 150, and is collected by the light collecting unit 130 on the phosphor of the phosphor wheel 140. It is focused on. Fluorescence emitted from the phosphor of the phosphor wheel 140 is guided in the negative direction of the Z axis by the light collecting unit 130 and then reflected by the spectroscopic unit 150.
- the dichroic mirrors constituting the spectroscopic unit 150 are arranged so as to have an angle of approximately 45 degrees with respect to the emission direction of the fluorescence from the phosphor wheel 140 (that is, with respect to the Z-axis direction).
- the fluorescence is guided in the Y-axis direction by the dichroic mirror.
- the fluorescence guided in the Y-axis direction is extracted toward the outside as output light of the light source device 10 via the output lens 151.
- the configuration of the light source device according to the first embodiment has been described above with reference to FIG.
- the configuration example illustrated in FIG. 1 schematically illustrates the configuration of the light source device 10 according to the first embodiment.
- the light source device 10 may further include various optical members (not shown) with respect to the configuration shown in FIG.
- a diffuser plate may be provided before the light from the light source unit 110 enters the phosphor wheel 140.
- the diffusion plate By providing the diffusion plate, the laser light from the plurality of LDs of the light source unit 110 is appropriately diffused, and the condensed spot 143 can be formed as a region having a predetermined size.
- the light source device 10 may further include various optical members that can be mounted on a general light source device.
- the optical design of various optical members mounted on the light source device 10 such as the concave mirror 121 and the convex mirror 122 may be appropriately performed using simulation such as ray tracing.
- the position and size of the desired condensing spot 143 can be set according to the characteristics of the fluorescence to be obtained, the light emission characteristics of the phosphor of the phosphor wheel 140, and the like.
- a calculation model in which various optical members are arranged to simulate the light source device 10 is created, and with respect to the calculation model, the shape and the shape of each optical member so that the desired position and size of the focused spot 143 are realized.
- the optical design of each optical member may be performed by repeatedly executing the simulation while changing the arrangement position, the optical characteristics, and the like.
- each optical member of the light source device 10 is designed so as to realize a desired position and size of the focused spot 143.
- manufacturing variations and assembly of each optical member are performed.
- the position and size of the condensing spot 143 may deviate from the design value due to a positional deviation at the time. If the position and size of the light condensing spot 143 deviate greatly from the design value, the light condensing efficiency of the light converging unit 130 is reduced, or the quality of the fluorescent light emitted through the light condensing unit 130 (for example, parallelism) Or strength) may be reduced. Therefore, when the light source device 10 is assembled or when the light source device 10 is mounted on a device such as a projector, an operation of adjusting the position and size of the focused spot 143 may be performed.
- the concave mirror 121 and the convex mirror 122 have optical axes (the central axis of the paraboloid constituting the reflecting surface of the concave mirror 121 and the central axis of the spherical surface constituting the reflecting surface of the convex mirror). They can be arranged so as to be substantially coincident.
- the optical axis of the light collecting unit 130 is also provided so as to substantially coincide with the optical axes of the concave mirror 121 and the convex mirror 122.
- the optical axes of the condensing optical system for condensing the light from the light source unit 110 to the condensing spot 143 are aligned, in the light source device 10, the positions of the convex mirror 122 in the X axis direction and the Y axis direction , The positions of the focused spot 143 in the X-axis direction and the Y-axis direction can be adjusted. Further, by moving the position of the convex mirror 122 in the Z-axis direction, the size of the focused spot 143 can be adjusted.
- the parallel movement of the convex mirror 122 in the three-axis directions can independently adjust the position of the focused spot 143 in the X-axis direction, the position in the Y-axis direction, and the size. Therefore, the adjustment of the condensing spot 143 can be performed more easily and with higher accuracy.
- the parallel movement of the convex mirror 122 in the three-axis directions can be executed by the adjusting mechanism described above, for example.
- the adjustment mechanism finely adjusts the position of the convex mirror 122 in the three-axis directions. The position and size of the focused spot 143 are adjusted.
- FIG. 2 is a diagram illustrating a configuration example of a general light source device.
- a general light source device 90 mainly includes a light source unit 910, a light guide unit 920, a light collecting unit 930, a phosphor wheel 940, and a spectroscopic unit 950.
- a transmissive phosphor wheel is used in the light source device described in Patent Document 1.
- a light source device 90 shown in FIG. 2 corresponds to a light source device described in Patent Document 1 in which a reflective phosphor wheel 940 is applied instead of a transmissive phosphor wheel.
- the concave mirror 921 is disposed so that the reflection surface thereof faces the light source unit 910.
- the concave mirror 921 reflects the light from the light source unit 910 toward the flat mirror 922.
- the plane mirror 922 is disposed so that the reflection surface thereof faces the concave mirror 921.
- Light from the light source unit 910 reflected by the concave mirror 921 and incident on the flat mirror 922 is guided in the positive direction of the Z axis.
- the light from each of the plurality of LDs of the light source unit 910 is typically represented by one solid line. Further, the light after being reflected by the plane mirror 922 is typically shown by one solid line.
- the light reflected by the plane mirror 922 is not substantially parallel light but is collected at a predetermined point in the positive direction of the Z-axis.
- a collimating optical system 923 is provided at the condensing position.
- the collimating optical system 923 is configured by a lens group or the like for making light substantially parallel light, and guides reflected light from the plane mirror 922 toward the phosphor wheel 940 as substantially parallel light.
- the spectroscopic unit 950 is constituted by, for example, a dichroic mirror. Fluorescence emitted from the phosphor of the phosphor wheel 940 is reflected by the dichroic mirror, and is taken out as output light of the light source device 90 via the output lens 951. Note that the configuration and function of the spectroscopic unit 950 may be the same as the configuration and function of the spectroscopic unit 150 according to the first embodiment, and thus detailed description thereof is omitted.
- a transmissive phosphor wheel is disposed at a position where light reflected by the plane mirror 922 is collected (that is, a position corresponding to the position where the collimating optical system 923 is disposed).
- the reflection light by the plane mirror 922 is collected on the phosphor of the phosphor wheel.
- fluorescence is emitted from the surface opposite to the incident direction of the excitation light, when the transmission type phosphor wheel is arranged as described above with respect to the configuration shown in FIG. Will emit fluorescence in the positive direction of the Z-axis.
- the reflection type phosphor wheel 940 is applied to the light source device described in Patent Document 1, the reflection type phosphor wheel 940 is arranged as it is at the condensing position of the reflected light from the plane mirror 922. It is difficult to do. This is because, as described above, since the light emitted from the phosphor of the phosphor wheel 940 is isotropically emitted, the fluorescence is condensed on the surface of the phosphor wheel 940 where the fluorescence is emitted. This is because it is necessary to arrange a condensing unit for this purpose. That is, when the reflection type phosphor wheel 940 is disposed at the position where the reflected light is reflected by the plane mirror 922 shown in FIG.
- the fluorescence is collected between the plane mirror 922 and the phosphor wheel 940. It is necessary to arrange a lens or the like. However, when the lens is provided, the reflected light from the plane mirror 922 is not collected on the phosphor of the phosphor wheel 940.
- the condensing unit provided in the front stage of the phosphor wheel 940 (excitation light incident side and fluorescence emission side)
- the condensing unit and other optical members must be configured to have both functions of condensing the phosphor wheel on the phosphor and condensing the fluorescence emitted from the phosphor. Therefore, when the reflective phosphor wheel 940 is applied to the light source device described in Patent Document 1, the collimating optical system 923 is provided at the position where the reflected light is collected by the plane mirror 922 as illustrated.
- the condensing unit 930 and the phosphor wheel 940 are provided in the subsequent stage.
- a convex mirror 122 is provided in place of the plane mirror 922 at a position where the plane mirror 922 is provided in the light source device 90 shown in FIG. It is done. Further, since the concave mirror 121 and the convex mirror 122 are arranged so that the optical axes of the concave mirror 121 and the convex mirror 122 are substantially coincident with each other, the reflected light from the convex mirror 122 is directed to the phosphor wheel 140 as substantially parallel light. Is guided. Therefore, there is no need to provide an optical member corresponding to the collimating optical system 923 shown in FIG.
- the position of the condensing spot 943 is changed by changing the angle formed by the reflecting surface of the plane mirror 922 and the Z axis (the angle of the plane mirror 922 with respect to the Z axis direction). And the size can be adjusted.
- FIG. 3 is an explanatory diagram for explaining the change of the angle of the plane mirror 922 in the general light source device 90.
- the mechanism in which the rotation shaft is provided at the position shown in FIG. 3A is not realistic because the configuration becomes complicated. It is considered that the actual rotation axis is often provided at the end in the longitudinal direction as shown in FIG. However, in the case where the rotation axis is provided at the end in the longitudinal direction, the position of the plane mirror 922 in the Z-axis direction changes greatly with the rotation of the plane mirror 922.
- FIG. 4 is a diagram showing a change in the focused spot 943 when the angle of the flat mirror 922 with respect to the Z-axis direction is changed in a general light source device 90.
- a white region represents a region where the light intensity is high. That is, it can be said that the white region represents the focused spot 943.
- FIG. 4B shows the light intensity distribution when the plane mirror 922 is rotated by 0.5 degrees with respect to the Z-axis direction.
- FIG. 4B only the angle of the plane mirror 922 is changed and the position in the Z-axis direction is not changed so as to correspond to the situation shown in FIG.
- the position of the focused spot 943 is moved in parallel with the Y-axis direction as compared with the case shown in FIG. 4A in accordance with the change in the angle of the plane mirror 922.
- the size of the condensing spot 943 is not substantially changed.
- only the position of the focused spot 943 can be adjusted when only the angle is changed without changing the position of the plane mirror 922 in the Z-axis direction.
- FIG. 4C shows that, in a general light source device 90, when the angle of the plane mirror 922 with respect to the Z-axis direction is changed in order to adjust only the position of the focused spot 943, the focused spot. It shows that the size changes to 943.
- the general light source device 90 it is difficult to independently adjust the position and size of the focused spot 943, and it is difficult to say that the focused spot 943 can be easily adjusted.
- the light source device 10 by moving the positions of the convex mirror 122 in the X-axis direction and the Y-axis direction, The positions of the focused spot 143 in the X-axis direction and the Y-axis direction can be adjusted. Further, the size of the focused spot 143 can be adjusted by moving the position of the convex mirror 122 in the Z-axis direction.
- FIG. 5B shows the light intensity distribution when the position of the convex mirror 122 in the X-axis direction is changed by ⁇ 0.4 (mm).
- the position of the focused spot 143 moves in the X-axis direction in accordance with the movement of the convex mirror 122 in the X-axis direction compared to the case shown in FIG. I understand.
- the size of the focused spot 143 is not substantially changed.
- FIG. 5C shows the light intensity distribution when the position of the convex mirror 122 in the Y-axis direction is changed by ⁇ 0.4 (mm).
- the position of the focused spot 143 is moved in the Y-axis direction in accordance with the movement of the convex mirror 122 in the Y-axis direction compared to the case shown in FIG. I understand.
- the size of the focused spot 143 is not substantially changed at this time.
- the position of the converging spot 143 in the XY plane is changed by changing the position of the convex mirror 122 in the XY plane. It can be seen that the position can be adjusted independently for each axial direction.
- FIG. 6A shows the intensity distribution when the convex mirror 122 is arranged at the design position, as in FIG. 5A.
- a substantially circular condensing spot 143 exists at the approximate center in the illustrated region.
- the size of the focused spot 143 can be adjusted by changing the position of the convex mirror 122 in the Z-axis direction.
- a mechanism that translates a member can be configured more simply than a mechanism that rotates the member.
- a mechanism that holds the position of the member with high accuracy after the translation of the member is realized in comparison with a mechanism that maintains the angle of the member with high accuracy after the rotation of the member. Easy. Therefore, even if an adjustment mechanism that translates the convex mirror 122 in the three-axis direction is provided in the light source device 10, the light source device 10 is not so large. Further, since the position of the convex mirror 122 is held with high accuracy, the position and size of the focused spot 143 can be kept constant with high accuracy.
- the light source device 10 is driven so as to further extend the life of the phosphor of the phosphor wheel 140 by using a mechanism for adjusting the position of the convex mirror 122.
- the adjustment mechanism is configured to automatically operate according to a program, and the position of the convex mirror 122 in the XY plane is dynamically adjusted by the adjustment mechanism while the light source device 10 is being driven. To change. As a result, the position of the focused spot 143 dynamically changes while the light source device 10 is being driven.
- the relative position of the light condensing spot 143 on the phosphor wheel 140 can be changed more greatly, so that deterioration of the phosphor performance is further suppressed, and the phosphor wheel is reduced.
- the lifetime of 140 can be increased.
- FIG. 7 is a diagram illustrating a configuration example of the light source device according to the second embodiment.
- the light source device 20 a plurality of combinations of the light source unit 110 and the concave mirror 121 are provided for one convex mirror 122.
- strength of the excitation light in the condensing spot 143 can be increased, and the intensity
- the light from the plurality of light source units 110 and the concave mirror 121 can be reflected by the single convex mirror 122, so there is no need to add the convex mirror 122, and the apparatus Can be kept relatively small.
- the pair of light source units 110 and the concave mirror 121 are provided symmetrically in the Y-axis direction with the convex mirror 122 interposed therebetween, but the second embodiment is not limited to such an example.
- the number and position of the combination of the light source unit 110 and the concave mirror 121 may be arbitrary.
- four sets of the light source unit 110 and the concave mirror 121 may be provided symmetrically in the X axis direction and the Y axis direction with the convex mirror 122 interposed therebetween.
- any number of combinations of the light source units 110 and the concave mirrors 121 may be provided at arbitrary positions around the convex mirror 122.
- the light source device 30 according to the third embodiment mainly includes a light source unit 110, a light guide unit 320, a light collecting unit 130, a phosphor wheel 140, and a spectroscopic unit 150. Is done. Note that the light source device 30 according to the third embodiment corresponds to the light source device 10 according to the first embodiment described above in which the configuration of the light guide unit 120 is changed. Since the configuration and functions of the other optical members are the same as those in the first embodiment, a detailed description thereof will be omitted.
- the light guide unit 320 includes a pair of light source units 110 and a concave mirror 121 provided symmetrically with a pair of convex mirrors 323a and 323b interposed therebetween.
- the pair of convex mirrors 323a and 323b has a shape in which the convex mirror 122 having a substantially hemispherical shape shown in FIG. 1 is divided in half.
- the convex mirrors 323a and 323b are also referred to as divided convex mirrors 323a and 323b for convenience.
- the emitted light from the first light source unit 110 is reflected by the first concave mirror 121 provided corresponding to the first light source unit 110 and is condensed on the divided convex mirror 323a.
- the divided convex mirror 323 a further reflects the emitted light from the first light source unit 110 and guides it toward the phosphor wheel 140.
- the emitted light from the second light source unit 110 different from the first light source unit 110 is reflected by the second concave mirror 121 provided corresponding to the second light source unit 110, and the divided convex mirror 323b. It is focused on.
- the divided convex mirror 323 b further reflects the light emitted from the second light source unit 110 and guides it toward the phosphor wheel 140.
- Both the light emitted from the first light source unit 110 guided by the divided convex mirror 323a and the light emitted from the second light source unit 110 guided by the divided convex mirror 323b are collected by the light collecting unit 130. Then, the light is condensed on the light condensing spot 143 on the phosphor of the phosphor wheel 140.
- the light guide unit 320 is configured by providing the combination of the light source unit 110 and the concave mirror 121 with respect to the plurality of divided convex mirrors 323a and 323b.
- the intensity of the excitation light at the condensing spot 143 can be increased as in the second embodiment described above, and the fluorescence emitted from the phosphor wheel 140 can be increased.
- the strength can also be increased.
- an adjustment mechanism for adjusting the positions in the three axial directions may be provided for each of the plurality of divided convex mirrors 323a and 323b. Thereby, the position and size of the condensing spot 143 can be adjusted for each of the divided convex mirrors 323a and 323b.
- FIG. 9 is a diagram illustrating an example of formation of the condensing spot 143 in the light source device 30 according to the third embodiment.
- the light intensity distribution in a predetermined region in the XY plane where the focused spot 143 exists is illustrated.
- the white region represents a region where the light intensity is high
- the white region represents the condensed spot 143.
- the position of the condensing spot 143 for each of the divided convex mirrors 323a and 323b is intentionally shifted. That is, a plurality of condensing spots 143 having different positions can be formed corresponding to each of the plurality of divided convex mirrors 323a and 323b. This makes it possible to appropriately adjust the intensity so that the intensity of the excitation light applied to the phosphor does not become larger than necessary.
- the intensity of the incident excitation light and the intensity of the emitted fluorescence are not necessarily proportional, and it is known that the luminance of the fluorescence becomes saturated as the intensity of the excitation light increases. It has been. Therefore, in the region where the luminance of the fluorescence is saturated, even if the intensity of the excitation light incident on the phosphor is increased, the luminance of the emitted fluorescence cannot be further improved, and the conversion efficiency to fluorescence is increased. From this point of view, the loss is large.
- the positions of the divided convex mirrors 323a and 323b in the three-axis directions are adjusted so that the condensing spots 143 for the divided convex mirrors 323a and 323b are shifted. . That is, a plurality of condensing spots 143 are provided at different positions. In this way, by providing a plurality of condensing spots 143 and appropriately controlling the intensity of light at each condensing spot 143, the phosphors can be compared with the case where light having a high intensity is irradiated by a single condensing spot 143.
- FIG. 10 is a diagram illustrating a configuration example of the light source device according to the fourth embodiment.
- the light source device 40 according to the fourth embodiment mainly includes a light source unit 110, a light guide unit 120, light collecting units 130 and 460, and a phosphor wheel 440.
- the light source device 40 according to the fourth embodiment is the light source device 10 according to the first embodiment described above, in which a transmissive phosphor wheel 440 is applied instead of the reflective phosphor wheel 140.
- the spectroscopic unit 150 is omitted from the light source device 10, and a light collecting unit 460 is added. Since the configuration and functions of the other optical members are the same as those in the first embodiment, a detailed description thereof will be omitted.
- a light collecting unit 460 that collects the fluorescent light and guides it as substantially parallel light to a subsequent optical member is provided.
- the configuration of the light collecting unit 460 may be the same as that of the light collecting unit 130.
- the fluorescence condensed by the condensing unit 460 is taken out as output light of the light source device 90 through the output lens 151. Since the fluorescence is emitted isotropically from the phosphor of the phosphor wheel 440, the light collecting surface 460 is provided on the radiation surface, so that the fluorescence can be taken out more efficiently. In addition, in order to improve the fluorescence condensing efficiency, the condensing unit 460 may be disposed as close to the phosphor wheel 440 as possible.
- a light source device 45 mainly includes a light source unit 110, a light guide unit 320, light collecting units 130 and 460, and a phosphor wheel 440. Composed.
- the light source device 45 according to this modification corresponds to the light source device 30 according to the third embodiment described above to which the transmission type phosphor wheel 440 is applied.
- the light guide unit 320 is configured by providing a plurality of combinations of the light source unit 110, the concave mirror 121, and the divided convex mirror.
- the light from each light source unit 110 is guided toward the phosphor wheel 440 by the corresponding divided convex mirrors 323 a and 323 b and condensed on the phosphor by the light collecting unit 130.
- the arrangement positions of the divided convex mirrors 323a and 323b in the three-axis directions as shown in FIG. Good.
- FIG. 12 is a diagram illustrating a configuration example of the light source device according to the fifth embodiment.
- the light source device 50 mainly includes a light source unit 110, a light guide unit 320, a light collecting unit 130, a phosphor wheel 140, and a spectroscopic unit 350. Is done.
- the light source device 50 according to the fifth embodiment is different from the light source device 30 according to the third embodiment described above in that the arrangement of the optical members is changed and the function of the spectroscopic unit 150 is changed accordingly. Correspond. Since the configuration and function of the other optical members are substantially the same as those of the third embodiment, detailed description thereof is omitted.
- the light source device 50 is provided with the light collecting unit 130 and the phosphor wheel 140 with the direction substantially perpendicular to the traveling direction of the light guided from the light guide unit 320 as the optical axis.
- the light guided in the positive direction of the Z axis from the light guide unit 320 is reflected by the spectroscopic unit 350 provided in the traveling direction, and its optical path is changed by approximately 90 degrees.
- the optical path of the light is changed by the spectroscopic unit 350 in the positive direction of the Y axis. Then, the light is condensed by the condensing unit 130 onto the condensing spot 143 on the phosphor of the phosphor wheel 140.
- the fluorescence emitted from the phosphor by the irradiation of the excitation light is collected by the light collecting unit 130 and guided to the spectroscopic unit 350 as a substantially parallel light (that is, toward the negative direction of the Y axis). .
- the spectroscopic unit 350 since the spectroscopic unit 350 has the performance of transmitting light in the wavelength band corresponding to the fluorescence, the fluorescence emitted from the phosphor wheel 140 passes through the spectroscopic unit 350 and is directly on the Y axis. Proceed toward the negative direction. Then, the fluorescence is extracted outward as output light of the light source device 50 through the output lens 151.
- the dichroic mirror having characteristics different from those of the first to third embodiments is used as the spectroscopic unit 350, so that the light source devices according to the first to third embodiments are used.
- the arrangement positions of the light collecting unit 130 and the phosphor wheel 140 can be changed with respect to 10, 20, and 30.
- the configurations of the light source devices 10, 20, and 30 according to the first to third embodiments are applied, or the light source device 50 according to the fifth embodiment. Whether to apply such a configuration is determined in consideration of the ease of work when assembling the light source device 10, 20, 30, 50, the size of the housing of the light source device 10, 20, 30, 50, etc. May be selected.
- the light source device directly outputs fluorescence emitted from a phosphor as its output light.
- a YAG phosphor is used as the phosphor.
- FIG. 13 is a graph showing a fluorescence spectrum in a YAG phosphor.
- the horizontal axis represents the wavelength of the fluorescence emitted from the YAG phosphor
- the vertical axis represents the intensity of the normalized fluorescence
- the relationship between the two is plotted.
- a light source device that outputs white light is realized by adding a light source unit that outputs light in the blue band to the configuration of the light source device according to each of the embodiments described above. .
- FIG. 14 is a diagram illustrating a configuration example of the light source device according to the sixth embodiment.
- the light source device 60 includes a light source unit 110, a light guide unit 320, a light collecting unit 130, a phosphor wheel 140, a spectroscopic unit 150, and an additional light source unit 670. And mainly consists of. Note that a light source device 60 according to the sixth embodiment corresponds to a light source device 670 added to the light source device 30 according to the third embodiment described above. Since the configuration and function of the other optical members are substantially the same as those of the third embodiment, detailed description thereof is omitted.
- the additional light source unit 670 emits light in a wavelength band different from the fluorescence emitted from the phosphor of the phosphor wheel 140.
- the additional light source unit 670 can be configured as a light source that emits light in the blue band.
- the sixth embodiment is not limited to such an example, and the additional light source unit 670 generates white light when superimposed on the fluorescence from the phosphor according to the characteristics of the phosphor of the phosphor wheel 140. It may be appropriately configured to emit light having such a wavelength band.
- the additional light source unit 670 is arranged so that additional light from the additional light source unit 670 is superimposed on the fluorescence that is the output light.
- the additional light source unit 670 is disposed on the opposite side of the output lens 151 with the spectroscopic unit 150 interposed therebetween.
- the additional light source unit 670 includes a light source unit 671 and a lens group 672.
- the light source unit 671 may be the same as the light source unit 110 that emits excitation light for the phosphor of the phosphor wheel 140.
- at least one LD that emits laser light in a blue band and light emitted from the LD. Is made up of at least one collimator lens that is substantially parallel.
- the light from the light source unit 671 passes through the lens group 672 and enters the spectroscopic unit 150.
- a light source unit 671 that outputs light in the blue band is used in the same manner as the light source unit 110. Therefore, the laser light emitted from the light source unit 671 passes through the lens group 672 and the spectroscopic unit 150 and is combined with the fluorescence emitted from the phosphor wheel 140 and reflected by the spectroscopic unit 150. Thereby, as the output light of the light source device 60, white light in which the light from the light source unit 671 and the fluorescence from the phosphor wheel 140 are synthesized is obtained.
- the lens group 672 is composed of a plurality of plano-convex lenses, but the configuration of the lens group 672 is not limited to this example.
- the lens group 672 may be appropriately configured so that light from the light source unit 671 and fluorescence are appropriately combined, and the combined light has desired characteristics (for example, intensity, parallelism, etc.) as white light. .
- the light source device according to each embodiment described above can be suitably applied to a light source of a projector, for example.
- a light source of a projector for example.
- several configuration examples when the light source device according to each of the above-described embodiments is applied to a light source of a projector will be described.
- FIG. 15 is a diagram showing a configuration of a projector according to the first configuration example.
- the projector 1 according to the first configuration example includes a light source device 60 and an image projection device 1000.
- the configuration and function of the light source device 60 have already been described in the above (6. Sixth Embodiment), detailed description thereof is omitted here.
- the image projection apparatus 1000 generates an image using the output light of the light source device 60 and projects the image.
- An image projection apparatus 1000 includes a first fly-eye lens 1003, a second fly-eye lens 1005, a polarization conversion element 1007, a condensing lens 1009, a cross dichroic mirror 1011, reflection mirrors 1015 and 1019, and a relay in a housing 1001.
- Optical members such as lenses 1017 and 1021, dichroic mirror 1023, wire grid type polarization separation elements 1025R, 1025G and 1025B, reflection type liquid crystal panels 1027R, 1027G and 1027B, and cross prism 1029 are mounted.
- a projection unit 1031 is provided in the emission direction of the light synthesized by the cross prism 1029.
- the light source device 60 may be incorporated in the housing 1001 together with other optical members.
- a lens 1009 is added in order, and the cross dichroic mirror 1011 is reached.
- the first fly-eye lens 1003 and the second fly-eye lens 1005 as a whole have a function of adjusting incident light irradiated from the light source device 60 to the polarization conversion element 1007 into a uniform luminance distribution.
- the substantially parallel light incident from the light source device 60 is divided into a plurality of light beams by the microlens of the first fly-eye lens 1003 and imaged on the corresponding microlens in the second fly-eye lens 1005.
- Each of the microlenses of the second fly-eye lens 1005 functions as a secondary light source, and irradiates the polarization conversion element 1007 with incident light as a plurality of parallel lights with uniform brightness.
- the polarization conversion element 1007 has a function of aligning the polarization state of incident light incident through the first fly-eye lens 1003 and the second fly-eye lens 1005.
- the light whose polarization state is aligned by the polarization conversion element 1007 enters the cross dichroic mirror 1011 via the condenser lens 1009.
- arrows indicating the traveling directions of the blue light 1013 ⁇ / b> B, the green light 1013 ⁇ / b> G, and the red light 1013 ⁇ / b> R which are components included in the incident light from the light source device 60, on the optical path after the condenser lens 1009, respectively. This is schematically illustrated by arrows of different line types.
- the cross dichroic mirror 1011 is configured by combining two dichroic mirrors having different reflection characteristics and transmission characteristics.
- the cross dichroic mirror 1011 is configured to separate the blue light 1013B, the green light 1013G, and the red light 1013R.
- the wire grid type polarization separation element 1025B has a property of reflecting S-polarized light and transmitting P-polarized light at the end face where the wire grid is provided. Accordingly, the blue light 1013B incident on the wire grid type polarization separation element 1025B is polarized and separated, for example, only the P-polarized light component is incident on the reflective liquid crystal panel 1027B.
- Reflected light from the reflective liquid crystal panel 1027B is incident again on the end face where the wire grid of the wire grid type polarization separation element 1025B is provided. Since the reflected light from the reflective liquid crystal panel 1027B is S-polarized light, it is reflected at the end face and enters the cross prism 1029 provided in the reflected direction.
- the green light 1013G and the red light 1013R separated from the blue light 1013B by the cross dichroic mirror 1011 are guided along an optical path different from that of the blue light 1013B, reflected by the reflection mirror 1019, passed through the relay lens 1021, and then dichroic. Incident on the mirror 1023.
- the dichroic mirror 1023 has a property of reflecting the green light 1013G and transmitting the red light 1013R, and the dichroic mirror 1023 separates the green light 1013G and the red light 1013R.
- the green light 1013G separated by the dichroic mirror 1023 is incident on the wire grid type polarization separation element 1025G and the reflection type liquid crystal panel 1027G. Also, the red light 1013R separated by the dichroic mirror 1023 is incident on the wire grid type polarization separation element 1025R and the reflection type liquid crystal panel 1027R.
- the configuration and function of the wire grid type polarization separation elements 1025G and 1025R are the same as the configuration and function of the wire grid type polarization separation element 1025B, and the configuration and function of the reflection type liquid crystal panels 1027G and 1027R are the same as those of the reflection type liquid crystal panel 1027B. Since it is the same as the function, detailed description is omitted here.
- the S polarization component of the green light 1013G reflecting the video signal in the reflection type liquid crystal panel 1027G is incident on the cross prism 1029, and the wire grid type polarization separation element 1025R and The S-polarized component of the red light 1013R reflecting the video signal in the reflective liquid crystal panel 1027R is incident on the cross prism 1029 by the reflective liquid crystal panel 1027R.
- the configuration of the projector 1 according to the first configuration example has been described above.
- the light source device 60 according to the sixth embodiment is used as the light source of the projector 1.
- the quality of white light output from the light source device 60 for example, Intensity, parallelism, etc.
- the quality of the projection light from the projector 1 may be lowered. If the quality of the projection light from the projector 1 decreases, the image quality of the projected image by the projector 1 may be deteriorated.
- the position and size of the condensing spot 143 on the phosphor of the phosphor wheel 140 are adjusted by a relatively simple method of adjusting the positions of the divided convex mirrors 323a and 323b in the three-axis directions. can do. Therefore, for example, when the light source device 60 is assembled to the projector 1, the adjustment of the condensing spot 143 is performed so that the quality of the projection light from the projector 1 is improved. Is possible. In addition, since the light source device 60 can adjust the position and size of the focused spot 143 with higher accuracy, the quality of the projection light can be improved and a higher quality projection image can be obtained.
- FIG. 16 is a diagram illustrating a configuration of a projector according to the second configuration example.
- the configuration example described below corresponds to a configuration in which some optical members are changed or new optical members are added to the configuration of the projector 1 according to the first configuration example described above. To do. Therefore, in the following description of each configuration example, detailed description of items that are the same as those in the first configuration example will be omitted, and items that are different from the first configuration example will be mainly described. Also, in each of the following configuration examples, the main configuration is the same as that of the first configuration example, so that the same effect as that obtained in the first configuration example described above can be obtained.
- the items described in the first configuration example described above and the respective configuration examples described below may be combined with each other as far as possible.
- the projector 2 according to the second configuration example includes a light source device 30, an additional light source unit 670, and an image projection device 2000.
- a light source device 30 since the configuration and function of the light source device 30 have already been described in the above (3. Third embodiment), detailed description thereof is omitted here.
- the configuration and function of the additional light source unit 670 have already been described in the above section (6. Sixth embodiment), and thus detailed description thereof will be omitted here.
- any of the light source devices 10, 20, 40, and 50 described above may be used.
- the light source device 30 and the additional light source unit 670 are provided as light sources, respectively.
- the light source device 30 functions as a light source that outputs light in the green band to the red band
- the additional light source unit 670 functions as a light source that outputs light in the blue band.
- the image projecting device 2000 has different paths for the light from the green band to the red band from the light source device 30 and the paths for the blue band light from the additional light source unit 670 to enter. It is provided as a route.
- the configuration of the image projection apparatus 2000 is the same as that of the image projection apparatus 1000 according to the first configuration example except that a plurality of incident paths corresponding to a plurality of light sources are provided. Therefore, in the following description of the image projection apparatus 2000, differences from the image projection apparatus 1000 will be mainly described.
- the image projection apparatus 2000 includes a first optical system 2003, a second optical system 2005, relay lenses 1017 and 1021, dichroic mirror 1023, wire grid type polarization separation elements 1025R, 1025G, and 1025B, a reflection type, in a casing 2001.
- Optical members such as liquid crystal panels 1027R, 1027G, 1027B and a cross prism 1029 are mounted.
- a projection unit 1031 is provided in the emission direction of the light synthesized by the cross prism 1029.
- the light source device 30 and the additional light source unit 670 may be incorporated in the housing 2001 together with other optical members.
- the configurations and functions of the relay lenses 1017 and 1021, the dichroic mirror 1023, the wire grid type polarization separation elements 1025R, 1025G, and 1025B, the reflective liquid crystal panels 1027R, 1027G, and 1027B, the cross prism 1029, and the projection unit 1031 are as described above (7 Since the configuration and function of these members described in (-1) First Configuration Example) are the same, detailed description thereof is omitted.
- the first optical system 2003 is provided in the incident path corresponding to the light source device 30 of the image projection apparatus 2000, and the second optical system 2005 is provided in the incident path corresponding to the additional light source unit 670.
- the first optical system 2003 includes a first fly-eye lens 1003, a second fly-eye lens 1005, a polarization conversion element 1007, and a condenser lens 1009.
- these optical members of the first optical system 2003 are added in order, and the relay The lens 1021 is reached.
- the configurations and functions of the first fly-eye lens 1003, the second fly-eye lens 1005, the polarization conversion element 1007, and the condenser lens 1009 are the same as those described in (7-1. First Configuration Example) above. Since it is the same as that of the structure and function of this member, the detailed description is abbreviate
- the output light from the light source device 30 that has entered the relay lens 1021 enters the dichroic mirror 1023 and is separated into green light 1013G and red light 1013R.
- the green light 1013G is incident on the wire grid type polarization separation element 1025G and the reflection type liquid crystal panel 1027G.
- the red light 1013R is incident on the wire grid type polarization separation element 1025R and the reflective liquid crystal panel 1027R. Since the behavior of the green light 1013G and the red light 1013R on the optical path after the relay lens 1021 is the same as that described in (7-1. First Configuration Example), detailed description thereof will be given. Omitted.
- the second optical system 2005 includes a first fly-eye lens 1003, a second fly-eye lens 1005, and a condenser lens 1009.
- these optical members of the second optical system 2005 are added in order to the relay lens 1017. It reaches.
- the polarization conversion element 1007 provided in the first optical system 2003 can be suitably omitted. This is because the output light from the additional light source unit 670 is laser light, and its polarization state is already aligned.
- the red light 1013R, the green light 1013G, and the blue light 1013B reflecting the video signal are incident on the cross prism 1029, and the cross prism 1029 superimposes and synthesizes the light of each color incident from the three directions, and then combines the light into the projection unit 1031. Exit toward.
- the light synthesized by the cross prism 1029 is projected onto the screen or the like outside the projector 2 by the projection unit 1031 and an image based on the video signal is displayed in color.
- the configuration of the projector 2 according to the second configuration example has been described above.
- the light source device 30 and the additional light source unit 670 are used as the light source of the projector 2.
- the additional light source unit 670 supplements wavelength band components not included in the output light from the light source device 30.
- the additional light source unit 670 is not incorporated in the light source device 30 but is prepared as a separate light source, and is incident on the image projection device 2000 through a separate route, thereby applying a load on the optical member on the incident route of the image projection device 2000. This can reduce the life of these optical members. Therefore, the projector 2 with higher reliability is realized.
- the configuration of the light source device 30 is simpler than that of the light source device 60 in which the additional light source unit 670 is incorporated.
- the reliability of the light source device 30 itself can be improved.
- FIG. 17 shows a projector in a case where a light source unit capable of emitting light in a wavelength band different from that of the additional light source unit 670 is further added to the light source device 30 as a modification of the second configuration example.
- the structure of is shown.
- FIG. 17 is a diagram illustrating a configuration of a projector according to a modification of the second configuration example.
- the projector 3 according to the present modification corresponds to the projector 2 shown in FIG. 16 in which an additional light source unit 2007 is added to the light source device 30.
- the additional light source unit 2007 is a light source unit that emits light in a wavelength band different from that of the additional light source unit 670.
- the additional light source unit 2007 can be arranged at a position similar to the arrangement position of the additional light source unit 670 described in the above (6. Sixth Embodiment) with respect to the light source device 30.
- the additional light source unit 2007 includes a light source 2009 that emits infrared rays and a lens group 2011. Infrared light emitted from the light source 2009 passes through the lens group 2011 to become substantially parallel light, is combined with fluorescence emitted from the phosphor wheel 140, and enters the image projection apparatus 2000. With this configuration, light emitted from the projector 3 becomes light in a wider wavelength band including the infrared band.
- the projector 3 can be used for simulation or the like when developing a device that can use both visible light and infrared rays, such as a night vision device.
- FIG. 18 is a diagram illustrating a configuration of a projector according to the third configuration example.
- a dichroic mirror 4001 is provided before the output light from the light source device 30 enters the image projection apparatus 1000, and light from the additional light source unit 670 is supplied to the dichroic mirror 4001.
- a reflection mirror 4003 that guides light toward the light source is provided in the direction of light emission from the additional light source unit 670.
- the dichroic mirror 4001 has a characteristic of transmitting light from the green band to the red band from the light source device 30 and reflecting the blue laser light from the additional light source unit 670. Incident on the device 1000. Note that the configuration for combining the light from the light source device 30 and the light from the additional light source unit 670 is not limited to the illustrated example, and may be set as appropriate.
- the configuration of the projector 4 according to the third configuration example has been described above.
- the light source device 30 and the additional light source unit 670 are used as the light source of the projector 4.
- the light from the light source device 30 and the light from the additional light source unit 670 are combined before entering the image projection apparatus 1000, and the combined light enters the image projection apparatus 1000 through the same path.
- the incident path to the image projection apparatus 2000 is configured corresponding to each light source as in the projector 2 according to the second configuration example described above, the load on the optical member in each incident path is While this can be reduced, the provision of a plurality of incident paths may increase the size of the casing 2001 of the image projection apparatus 2000 and increase the size of the projector 2 itself.
- the reliability of the light source can be improved by using the light source device 30 that has a simpler configuration and higher reliability, and the image projection device 1000 that can reduce the size of the housing 1001. There is a possibility that the projector 4 can be further downsized while ensuring the above.
- FIG. 19 is a diagram showing a configuration of a projector according to the fourth configuration example.
- the first to third configuration examples use a reflective liquid crystal panel
- the fourth configuration example corresponds to a configuration using a transmissive liquid crystal panel.
- the projector 5 includes a light source unit 70 and an image projection device 5000.
- the light source unit 70 outputs white light substantially parallel to the image projecting device 5000.
- the light source unit 70 the light source device 60 according to the sixth embodiment described above, or the light source devices 10, 20, 30, according to the first to fifth embodiments as used in the third configuration example, A combination of any one of 40 and 50 and the additional light source unit 670 is used.
- the image projection device 5000 generates an image using the output light of the light source unit 70 and projects the image.
- An image projection apparatus 5000 includes a first fly-eye lens 1003, a second fly-eye lens 1005, a polarization conversion element 1007, a condensing lens 1009, dichroic mirrors 5003 and 5005, reflection mirrors 5007 and 5009, and a housing 5001. 5011, relay lenses 5013 and 5015, field lenses 5017R, 5017G and 5017B, liquid crystal light valves 5019R, 5019G and 5019B, and an optical member such as a cross prism 1029 are mounted. Further, a projection unit 1031 is provided in the emission direction of the light synthesized by the cross prism 1029.
- the light source unit 70 may be incorporated in the housing 5001 together with other optical members.
- a lens 1009 is added in order, and the dichroic mirror 5003 is reached.
- the configurations and functions of the first fly-eye lens 1003, the second fly-eye lens 1005, the polarization conversion element 1007, and the condenser lens 1009 are the same as those described in (7-1. First Configuration Example). Since it is the same as that of a structure and function of a member, the detailed description is abbreviate
- the dichroic mirrors 5003 and 5005 have a property of selectively reflecting light in a predetermined wavelength band and transmitting light in other wavelength bands.
- the dichroic mirror 5003 is configured to reflect red light 1013R and transmit blue light 1013B and green light 1013G.
- the red light 1013R selectively reflected and separated by the dichroic mirror 5003 is reflected by the reflection mirror 5007, collimated by passing through the field lens 5017R, and then incident on the liquid crystal light valve 5019R for red light modulation. To do.
- the liquid crystal light valve 5019R includes, for example, a transmissive liquid crystal panel and a polarizing plate.
- a video signal is applied to the transmissive liquid crystal panel of the liquid crystal light valve 5019R, and the red light 1013R that has passed through the liquid crystal light valve 5019R has its polarization state modulated for each pixel to form an optical image corresponding to the video signal.
- the red light is incident on the cross prism 1029.
- the blue light 1013B and the green light 1013G transmitted through the dichroic mirror 5003 are incident on the subsequent dichroic mirror 5005.
- the dichroic mirror 5005 is configured to reflect the green light 1013G and transmit the blue light 1013B.
- the green light 1013G having passed through the liquid crystal light valve 5019G is incident on the cross prism 1029 as green light whose polarization state is modulated for each pixel and forms an optical image corresponding to the video signal.
- the blue light 1013B that has passed through the liquid crystal light valve 5019B is incident on the cross prism 1029 as green light whose polarization state is modulated for each pixel and forms an optical image corresponding to the video signal.
- the configuration of the projector 5 according to the fourth configuration example has been described above.
- the light source device according to each of the above-described embodiments can be suitably applied to the projector 4 in which the transmissive liquid crystal panel is used.
- the application example of the light source device according to each embodiment of the present disclosure is not limited to the projector.
- the light source device may be applied to other devices.
- the light source device may be applied to a lighting device.
- the quality of the irradiation light of the lighting device can be adjusted more easily, and the irradiation light can be kept in high quality.
- At least one light source unit that emits substantially parallel light in a predetermined wavelength band; and a light guide unit that guides light from the light source unit toward a light collection spot.
- a light source device in which light from the light source unit is sequentially reflected by a concave mirror and a convex mirror and guided toward the condensed spot.
- the concave mirror and the convex mirror are arranged so that the central axis of the reflective surface shape of the concave mirror and the central axis of the reflective surface shape of the convex mirror substantially coincide with each other.
- the light source device according to (1) or (2), further including an adjustment mechanism that independently adjusts the positions of the convex mirrors in the three axial directions.
- the light source device according to any one of (1) to (3), wherein the condensing spot is provided on a phosphor that emits fluorescence by light from the light source unit.
- the phosphor wheel on which the phosphor is provided on the substrate is a reflective phosphor wheel that emits fluorescence in the same direction as the incident direction of the light from the light source unit.
- the phosphor wheel on which the phosphor is provided on the substrate is a transmissive phosphor wheel that emits fluorescence in a direction opposite to the incident direction of light from the light source unit. ).
- a reflecting surface shape of at least one of the concave mirror and the convex mirror is an aspherical shape.
- a plurality of combinations of the light source unit and the concave mirror are provided for one convex mirror.
- the combination of the light source unit and the concave mirror is provided symmetrically across the convex mirror.
- a divided convex mirror having a shape obtained by dividing the convex mirror is provided corresponding to a combination of a plurality of the light source units and the concave mirror, and is emitted from the first light source unit to be a first concave surface.
- the light reflected by the mirror is reflected by the first divided convex mirror, guided toward the condensing spot, and emitted from the second light source unit and reflected by the second concave mirror.
- the light source device (11) The light source device according to (10), wherein a plurality of the condensing spots with different positions are formed corresponding to each of the plurality of divided convex mirrors. (12) While the light source device is being driven, the position of the convex mirror in the plane perpendicular to the light reflected by the convex mirror is adjusted, whereby the light condensing in the plane is performed.
- the light source device according to any one of (1) to (11), wherein a spot position dynamically changes.
- the focused spot is provided on a phosphor that emits fluorescence by light from the light source unit, and the light source device further includes a third light source unit that emits light in a wavelength band different from the fluorescence.
- a light source device comprising: at least one light source unit that emits substantially parallel light in a predetermined wavelength band; and a light guide unit that guides light from the light source unit toward a condensed spot; and the light source An image projection device that generates an image using the output light of the device and projects the image.
- light from the light source unit is sequentially transmitted by a concave mirror and a convex mirror.
- a projector that is reflected and guided toward the focused spot.
- Light source device 70 Light source unit 110 Light source unit 120, 220, 320 Light guide unit 121 Concave mirror 122 Convex mirror 130 Condensing unit 140, 440 Phosphor wheel 143 Condensing spot 150, 350 Spectroscopic unit 323a, 323b Split convex mirror 1000, 2000, 5000 Image projection device
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Abstract
Description
1.第1の実施形態
1-1.光源装置の構成
1-2.一般的な光源装置との比較
1-2-1.装置構成の比較
1-2-2.集光スポットの調整方法の比較
2.第2の実施形態
3.第3の実施形態
4.第4の実施形態
5.第5の実施形態
6.第6の実施形態
7.適用例
7-1.第1の構成例
7-2.第2の構成例
7-3.第3の構成例
7-4.第4の構成例
7-5.適用例についてのまとめ
8.補足
(1-1.光源装置の構成)
図1を参照して、本開示の第1の実施形態に係る光源装置の構成について説明する。図1は、第1の実施形態に係る光源装置の一構成例を示す図である。
上述したように、第1の実施形態によれば、集光スポット143の調整をより容易に、より高精度に行うことが可能になる。ここで、第1の実施形態による当該効果をより明確なものとするために、第1の実施形態に係る光源装置10と一般的な既存の光源装置との比較を行う。なお、ここでは、一般的な既存の光源装置の一例として、上記特許文献1に記載の光源装置に基づく構成との比較を行う。
まず、一般的な光源装置の構成について説明するとともに、第1の実施形態に係る光源装置10の構成との比較を行う。
ここで、第1の実施形態に係る光源装置10における集光スポット143の調整方法と、以上説明した一般的な光源装置90における集光スポット943の調整方法とを比較する。
図7を参照して、本開示の第2の実施形態に係る光源装置の構成について説明する。図7は、第2の実施形態に係る光源装置の一構成例を示す図である。
図8を参照して、本開示の第3の実施形態に係る光源装置の構成について説明する。図8は、第3の実施形態に係る光源装置の一構成例を示す図である。
図10を参照して、本開示の第4の実施形態に係る光源装置の構成について説明する。図10は、第4の実施形態に係る光源装置の一構成例を示す図である。
図12を参照して、本開示の第5の実施形態に係る光源装置の構成について説明する。図12は、第5の実施形態に係る光源装置の一構成例を示す図である。
以上説明した各実施形態に係る光源装置は、蛍光体から放射される蛍光を直接その出力光として出力するものである。上記(1-1.光源装置の構成)で説明したように、当該蛍光体としては、YAG系蛍光体が用いられる。
上述した各実施形態に係る光源装置の一適用例について説明する。各実施形態に係る光源装置は、例えば、プロジェクタの光源に好適に適用され得る。以下、上述した各実施形態に係る光源装置がプロジェクタの光源に適用された場合におけるいくつかの構成例について説明する。
図15を参照して、上述した各実施形態に係る光源装置がプロジェクタに適用された場合における第1の構成例について説明する。図15は、第1の構成例に係るプロジェクタの構成を示す図である。
図16を参照して、上述した各実施形態に係る光源装置がプロジェクタに適用された場合における第2の構成例について説明する。図16は、第2の構成例に係るプロジェクタの構成を示す図である。
図18を参照して、上述した各実施形態に係る光源装置がプロジェクタに適用された場合における第3の構成例について説明する。図18は、第3の構成例に係るプロジェクタの構成を示す図である。
図19を参照して、上述した各実施形態に係る光源装置がプロジェクタに適用された場合における第4の構成例について説明する。図19は、第4の構成例に係るプロジェクタの構成を示す図である。第1~第3の構成例が反射型液晶パネルを用いたものであったのに対して、第4の構成例は透過型液晶パネルを用いたものに対応する。
以上、上述した各実施形態に係る光源装置の一適用例として、これらの光源装置がプロジェクタに適用される場合について説明した。以上説明したように、本開示の各実施形態に係る光源装置では蛍光体上での集光スポットの調整をより容易に行うことができるため、これらの光源装置をプロジェクタに適用することにより、例えば当該集光スポットの位置ずれによってプロジェクタの投射光の品質が劣化している場合に、その改善をより容易に行うことができる。また、各実施形態に係る光源装置では、集光スポットの調整をより高精度に行うことができるため、プロジェクタの投射光の品質を向上させ、より高品質な投影画像を得ることができる。
以上、添付図面を参照しながら本開示の好適な実施形態について詳細に説明したが、本開示の技術的範囲はかかる例に限定されない。本開示の技術分野における通常の知識を有する者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、これらについても、当然に本開示の技術的範囲に属するものと了解される。
(1)所定の波長帯域の略平行光を射出する少なくとも1つの光源ユニットと、前記光源ユニットからの光を集光スポットに向かって導光する導光ユニットと、を備え、前記導光ユニットでは、前記光源ユニットからの光が、凹面ミラー及び凸面ミラーによって順に反射され、前記集光スポットに向かって導光される、光源装置。
(2)前記凹面ミラー及び前記凸面ミラーは、前記凹面ミラーの反射面形状の中心軸と、前記凸面ミラーの反射面形状の中心軸とが略一致するように配置される、前記(1)に記載の光源装置。
(3)前記凸面ミラーの3軸方向の位置をそれぞれ独立に調整する調整機構を更に備える、前記(1)又は(2)に記載の光源装置。
(4)前記集光スポットは、前記光源ユニットからの光によって蛍光を発する蛍光体上に設けられる、前記(1)~(3)のいずれか1項に記載の光源装置。
(5)前記蛍光体が基板上に設けられる蛍光体ホイールは、前記光源ユニットからの光の入射方向と同じ方向に向かって蛍光を放射する、反射型蛍光体ホイールである、前記(4)に記載の光源装置。
(6)前記蛍光体が基板上に設けられる蛍光体ホイールは、前記光源ユニットからの光の入射方向とは逆の方向に向かって蛍光を放射する、透過型蛍光体ホイールである、前記(4)に記載の光源装置。
(7)前記凹面ミラー及び前記凸面ミラーの少なくともいずれかの反射面形状は、非球面形状である、前記(1)~(6)のいずれか1項に記載の光源装置。
(8)前記光源ユニット及び前記凹面ミラーの組み合わせが、一の前記凸面ミラーに対して複数設けられる、前記(1)~(7)のいずれか1項に記載の光源装置。
(9)前記光源ユニット及び前記凹面ミラーの組み合わせが、前記凸面ミラーを挟んで対称的に設けられる、前記(8)に記載の光源装置。
(10)複数設けられる前記光源ユニット及び前記凹面ミラーの組み合わせに対応して、前記凸面ミラーが分割された形状を有する分割凸面ミラーがそれぞれ設けられ、第1の光源ユニットから射出され第1の凹面ミラーによって反射された光は、第1の分割凸面ミラーによって反射され、前記集光スポットに向かって導光され、第2の光源ユニットから射出され第2の凹面ミラーによって反射された光は、第2の分割凸面ミラーによって反射され、前記集光スポットに向かって導光される、前記(8)又は(9)に記載の光源装置。
(11)複数の前記分割凸面ミラーのそれぞれに対応して、位置が異なる複数の前記集光スポットが形成される、前記(10)に記載の光源装置。
(12)前記光源装置が駆動している最中に、前記凸面ミラーによる反射光に対して垂直な平面内での前記凸面ミラーの位置が調整されることにより、前記平面内での前記集光スポットの位置が動的に変化する、前記(1)~(11)のいずれか1項に記載の光源装置。
(13)前記集光スポットは、前記光源ユニットからの光によって蛍光を発する蛍光体上に設けられ、前記光源装置は、前記蛍光とは異なる波長帯域の光を射出する第3の光源ユニットを更に備え、前記光源装置は、前記蛍光と前記第3の光源ユニットからの出射光とが合成された光を出力する、前記(1)~(12)のいずれか1項に記載の光源装置。
(14)所定の波長帯域の略平行光を射出する少なくとも1つの光源ユニットと、前記光源ユニットからの光を集光スポットに向かって導光する導光ユニットと、を有する光源装置と、前記光源装置の出力光を用いて画像を生成し、当該画像を投射する画像投射装置と、を備え、前記光源装置の前記導光ユニットでは、前記光源ユニットからの光が、凹面ミラー及び凸面ミラーによって順に反射され、前記集光スポットに向かって導光される、プロジェクタ。
10、20、30、40、50、60 光源装置
70 光源部
110 光源ユニット
120、220、320 導光ユニット
121 凹面ミラー
122 凸面ミラー
130 集光ユニット
140、440 蛍光体ホイール
143 集光スポット
150、350 分光ユニット
323a、323b 分割凸面ミラー
1000、2000、5000 画像投射装置
Claims (14)
- 所定の波長帯域の略平行光を射出する少なくとも1つの光源ユニットと、
前記光源ユニットからの光を集光スポットに向かって導光する導光ユニットと、
を備え、
前記導光ユニットでは、前記光源ユニットからの光が、凹面ミラー及び凸面ミラーによって順に反射され、前記集光スポットに向かって導光される、
光源装置。 - 前記凹面ミラー及び前記凸面ミラーは、前記凹面ミラーの反射面形状の中心軸と、前記凸面ミラーの反射面形状の中心軸とが略一致するように配置される、
請求項1に記載の光源装置。 - 前記凸面ミラーの3軸方向の位置をそれぞれ独立に調整する調整機構を更に備える、
請求項2に記載の光源装置。 - 前記集光スポットは、前記光源ユニットからの光によって蛍光を発する蛍光体上に設けられる、
請求項1に記載の光源装置。 - 前記蛍光体が基板上に設けられる蛍光体ホイールは、前記光源ユニットからの光の入射方向と同じ方向に向かって蛍光を放射する、反射型蛍光体ホイールである、
請求項4に記載の光源装置。 - 前記蛍光体が基板上に設けられる蛍光体ホイールは、前記光源ユニットからの光の入射方向とは逆の方向に向かって蛍光を放射する、透過型蛍光体ホイールである、
請求項4に記載の光源装置。 - 前記凹面ミラー及び前記凸面ミラーの少なくともいずれかの反射面形状は、非球面形状である、
請求項1に記載の光源装置。 - 前記光源ユニット及び前記凹面ミラーの組み合わせが、一の前記凸面ミラーに対して複数設けられる、
請求項1に記載の光源装置。 - 前記光源ユニット及び前記凹面ミラーの組み合わせが、前記凸面ミラーを挟んで対称的に設けられる、
請求項8に記載の光源装置。 - 複数設けられる前記光源ユニット及び前記凹面ミラーの組み合わせに対応して、前記凸面ミラーが分割された形状を有する分割凸面ミラーがそれぞれ設けられ、
第1の光源ユニットから射出され第1の凹面ミラーによって反射された光は、第1の分割凸面ミラーによって反射され、前記集光スポットに向かって導光され、
第2の光源ユニットから射出され第2の凹面ミラーによって反射された光は、第2の分割凸面ミラーによって反射され、前記集光スポットに向かって導光される、
請求項9に記載の光源装置。 - 複数の前記分割凸面ミラーのそれぞれに対応して、位置が異なる複数の前記集光スポットが形成される、
請求項10に記載の光源装置。 - 前記光源装置が駆動している最中に、前記凸面ミラーによる反射光に対して垂直な平面内での前記凸面ミラーの位置が調整されることにより、前記平面内での前記集光スポットの位置が動的に変化する、
請求項1に記載の光源装置。 - 前記集光スポットは、前記光源ユニットからの光によって蛍光を発する蛍光体上に設けられ、
前記光源装置は、前記蛍光とは異なる波長帯域の光を射出する第2の光源ユニットを更に備え、
前記光源装置は、前記蛍光と前記第2の光源ユニットからの出射光とが合成された光を出力する、
請求項1に記載の光源装置。 - 所定の波長帯域の略平行光を射出する少なくとも1つの光源ユニットと、前記光源ユニットからの光を集光スポットに向かって導光する導光ユニットと、を有する光源装置と、
前記光源装置の出力光を用いて画像を生成し、当該画像を投射する画像投射装置と、
を備え、
前記光源装置の前記導光ユニットでは、前記光源ユニットからの光が、凹面ミラー及び凸面ミラーによって順に反射され、前記集光スポットに向かって導光される、
プロジェクタ。
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CN110325791B (zh) * | 2017-03-03 | 2022-03-01 | 昕诺飞控股有限公司 | 用于生成表面或半空照明效果的照明*** |
JP2021015247A (ja) * | 2019-07-16 | 2021-02-12 | キヤノン株式会社 | 光源装置およびこれを備える画像投射装置 |
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Also Published As
Publication number | Publication date |
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CN107077053A (zh) | 2017-08-18 |
US20170329209A1 (en) | 2017-11-16 |
US10444605B2 (en) | 2019-10-15 |
US10067413B2 (en) | 2018-09-04 |
CN107077053B (zh) | 2020-04-24 |
US20180373130A1 (en) | 2018-12-27 |
JPWO2016067822A1 (ja) | 2017-08-10 |
JP6635040B2 (ja) | 2020-01-22 |
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