JP6186786B2 - Light source device and projector - Google Patents

Description

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

  2. Description of the Related Art Conventionally, a projector that irradiates a light modulation device with light emitted from a light source device and enlarges and projects the light modulated and emitted by the light modulation device onto a screen by a projection optical system is widely known.

  Conventionally, a discharge lamp such as an ultra-high pressure mercury lamp has been used as a light source of such a projector. On the other hand, this type of discharge lamp has problems such as a relatively short life, difficult to light instantaneously, and ultraviolet rays emitted from the lamp deteriorate the liquid crystal light bulb.

  Therefore, a solid-state light source such as a semiconductor laser that can obtain light with high brightness and high output has attracted attention as a light source for a projector that can replace a discharge lamp. The semiconductor laser has advantages such as reduction in size, excellent color reproducibility, instantaneous lighting, and long life compared to conventional discharge lamps.

  In a light source device using a semiconductor laser, excitation light (blue light) emitted from the semiconductor laser and fluorescent light (yellow light) generated by exciting the phosphor with the excitation light are used. Has been done. (For example, see Patent Document 1).

  Specifically, the light source device described in Patent Literature 1 includes a plurality of excitation light sources, a plurality of collimator lenses, and a condenser lens. In the light source device described in Patent Document 1, after exciting each of a plurality of excitation lights emitted from a plurality of excitation light sources by a plurality of collimator lenses, the excitation light condensed by the condenser lens is converted into fluorescence from a fluorescent wheel. The body layer is irradiated and fluorescent light is emitted from the phosphor layer.

JP 2012-215633 A

  By the way, in the conventional light source device, each of the plurality of excitation lights emitted from the plurality of excitation light sources is parallelized by the plurality of collimator lenses, and the condenser lens is sufficiently large to capture all of the plurality of parallelized excitation lights. It was necessary to collect the excitation light using

  In the light source device described in Patent Document 1, in order to reduce the size of the condenser lens described above, the optical axis of the excitation light is refracted by shifting the optical axis of the collimator lens from the optical axis of the excitation light.

  However, even if the optical axis of the excitation light is refracted using the collimator lens, the light irradiated to the predetermined region is light in which a plurality of excitation lights collimated by the respective collimator lenses are superimposed on each other. Therefore, the excitation light collimated by each collimator lens cannot be condensed on a region having an arbitrary area without using a condensing lens.

  One aspect of the present invention has been proposed in view of such conventional circumstances, and irradiates a region of a desired area with light beams emitted from a plurality of light sources without using a conventional condenser lens. It is an object of the present invention to provide a light source device that can be used, and a projector including such a light source device.

In order to achieve the above object, a light source device according to one aspect of the present invention includes a plurality of first light sources that emit a first light flux and a second light source that emits a second light flux . An array light source including a light source, a first lens on which the first light flux is incident, and a second lens on which the second light flux is incident, the first light source and the second light source Is provided so as to sandwich the optical axis of the array light source , and a surface passing through the principal point of the first lens and orthogonal to the optical axis of the first lens is defined as a first reference surface. when the distance from the first light source to said first reference plane is longer than the distance from the front focal point of the first lens to said first reference plane, a main of the second lens When the surface that passes through the point and is orthogonal to the optical axis of the second lens is the second reference surface, the second light source The distance to the second reference plane is longer than the distance from the front focal point of the second lens to the second reference plane, and the optical axis of the first light flux is from the optical axis of the first lens. The optical axis of the second luminous flux is separated from the optical axis of the second lens, and the first luminous flux transmitted through the first lens and the second lens are transmitted. The second light flux intersects each other on the optical axis of the array light source .

  According to the configuration of the light source device of one aspect of the present invention, the distance from the first light source to the reference plane is longer than the distance from the front focal point of the first lens to the reference plane, in other words, the first light source. Is disposed at a position deviated from the front focal point of the first lens. Therefore, the first light beam emitted from the first lens can be focused by the first lens. In addition, since the optical axis of at least one of the first light flux and the second light flux is separated or inclined from the optical axis of the lens on which the one light flux is incident, this one light flux can be used as the lens. When transmitted, the optical axis of the transmitted light is tilted. As a result, the light beam from the first light source and the light beam from the second light source can be focused on a desired region with a desired concentration.

  Moreover, the structure provided with the array light source by which the several light source containing the said 1st light source and the said 2nd light source was arranged two-dimensionally may be sufficient.

  According to this configuration, it is possible to obtain light with higher luminance and higher output by using an array light source in which a plurality of light sources are arranged.

  Moreover, the structure provided with the lens array in which the some lens containing the said 1st lens and the said 2nd lens was arranged two-dimensionally may be sufficient.

  According to this configuration, it is possible to arrange a plurality of lenses at positions corresponding to a plurality of light sources.

  Further, it is preferable that the first light beam transmitted through the first lens and the second light beam transmitted through the second lens intersect each other.

  According to this configuration, the condensing lens required in the conventional light source device becomes unnecessary, and thus the optical system provided in the subsequent stage of the light source device can be reduced in size.

  Moreover, the structure provided with the afocal optical system into which the light beam inject | emitted from the said some lens injects may be sufficient.

  According to this configuration, it is possible to obtain a parallel light flux whose spot diameter is adjusted. It is also possible to configure an afocal optical system while omitting the focusing afocal lens.

  The afocal optical system may include a concave lens.

  According to this configuration, the afocal optical system can be reduced in size.

  Further, it is preferable that the plurality of light beams emitted from the plurality of light sources intersect at one point, and each of the plurality of light beams is converged at one point.

  According to this configuration, the condensing lens required in the conventional light source device is not required, and thus the optical system provided at the subsequent stage of the light source device can be further reduced in size.

  The light source may be a solid light source.

  According to this configuration, high luminance and high output light can be obtained, and the light source can be miniaturized.

  The projector according to the present invention projects any one of the light source devices, a light modulation device that modulates light emitted from the light source device according to image information, and light modulated by the light modulation device. A projection optical system.

  According to the configuration of the projector, it is possible to perform bright display with excellent image quality while further reducing the size.

It is a top view which shows schematic structure of a projector. It is a top view which shows schematic structure of a light source device. It is a top view which shows the positional relationship of a semiconductor laser and a collimator lens in case a semiconductor laser is in a defocused state. It is an optical path diagram of blue light when the semiconductor laser is in a defocused state. It is an optical path figure of blue light at the time of defocusing and decentering. It is an optical path diagram of blue light when defocusing is varied. It is an optical path diagram of blue light when an afocal lens made of a concave lens is used.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In addition, in the drawings used in the following description, in order to make the features easy to understand, there are cases where the portions that become the features are enlarged for the sake of convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. Absent.

[projector]
First, an example of the projector 1 shown in FIG. 1 will be described as an embodiment of the present invention.
FIG. 1 is a plan view showing a schematic configuration of the projector 1.

  The projector 1 is a projection type image display device that displays a color video (image) on a screen (projected surface) SCR. In addition, the projector 1 uses three liquid crystal light valves (liquid crystal panels) corresponding to the respective color lights of the red light LR, the green light LG, and the blue light LB as light modulation devices. Furthermore, the projector 1 uses a semiconductor laser (solid light source) that can obtain light with high luminance and high output as the light source of the light source device.

  Specifically, as shown in FIG. 1, the projector 1 illuminates the illumination device 2 that irradiates illumination light WL, and the color that separates the illumination light WL from the illumination device 2 into red light LR, green light LG, and blue light LB. The separation optical system 3 and the light modulation device 4R, the light modulation device 4G, and the light modulation device that modulate the color lights LR, LG, and LB according to the image information and form image light corresponding to the color lights LR, LG, and LB. 4B, a synthesis optical system 5 that synthesizes image light from each of the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B, and projection optics that projects the image light from the synthesis optical system 5 toward the screen SCR. System 6 is roughly provided.

  The illumination device 2 mixes excitation light (blue light) emitted from a semiconductor laser and fluorescent light (yellow light) generated by exciting a phosphor with the excitation light, thereby illuminating light (white light). WL is obtained. Details of the lighting device 2 will be described later with reference to FIG. The illumination device 2 irradiates the color separation optical system 3 with illumination light WL adjusted to have a uniform illuminance distribution.

  The color separation optical system 3 includes a first dichroic mirror 7a and a second dichroic mirror 7b, a first total reflection mirror 8a, a second total reflection mirror 8b, a third total reflection mirror 8c, and a first A relay lens 9a and a second relay lens 9b are roughly provided.

  The first dichroic mirror 7a has a function of separating the illumination light WL from the illumination device 2 into a red light LR and other colors of green light LG and blue light LB, and transmits the separated red light LR. At the same time, the green light LG and the blue light LB, which are other color lights, are reflected. On the other hand, the second dichroic mirror 7b has a function of separating the mixed light of the green light LG and the blue light LB into the green light LG and the blue light LB, and reflects the separated green light LG. Transmits blue light LB.

  The first total reflection mirror 8a is disposed in the optical path of the red light LR, and reflects the red light LR transmitted through the second dichroic mirror 7b toward the red light modulation device 4R. On the other hand, the second and third total reflection mirrors 8b and 8c are arranged in the optical path of the blue light LB, and reflect the blue light LB transmitted through the second dichroic mirror 7b.

  The first relay lens 9a and the second relay lens 9b are disposed in the optical path of the blue light LB. The first relay lens 9a and the second relay lens 9b have a function of compensating for the optical loss of the blue light LB due to the optical path length of the blue light LB being longer than the optical path lengths of the red light LR and the green light LG. Have.

  Each of the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B includes a liquid crystal light valve (liquid crystal panel), and modulates each color light LR, LG, LB corresponding to each light modulation device according to image information. Form image light. A pair of polarizing plates (not shown) are arranged on the light incident side and light emission side of each of the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B, and a straight line in a specific direction. The system allows only polarized light to pass through.

  In addition, on the light incident side of each of the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B, each of the color lights LR, LG, Field lenses 10R, 10G, and 10B that parallelize the LB are disposed.

  The combining optical system 5 is composed of a cross dichroic prism, combines image light incident from each of the light modulation device 4R, the light modulation device 4G, and the light modulation device 4B, and directs the combined image light to the projection optical system 6. And inject.

  The projection optical system 6 includes a projection lens group, and enlarges and projects the image light combined by the combining optical system 5 toward the screen SCR. Thereby, an enlarged color video (image) is displayed on the screen SCR.

[Lighting device]
Next, an example of the illumination device 2 shown in FIG. 2 will be described as an embodiment of the present invention.
FIG. 2 is a plan view showing a schematic configuration of the illumination device 2.

  As shown in FIG. 2, the illumination device 2 includes a first light source device 41, a second light source device 42, an afocal optical system 23, a homogenizer optical system 24, a polarization separation element 25, and a pickup optical system. 26, a fluorescent light emitting element 27, a condenser lens 28, a diffuser 29, a collimating lens 30, an integrator optical system 31, a polarization conversion element 32, and a superimposing optical system 33. The first light source device 41 includes a first light source unit 43 and a lens array 44. The second light source device 42 includes a second light source unit 45 and a collimator optical system 46. Of the first light source device 41 and the second light source device 42, the first light source device 41 corresponds to the “light source device” of the present invention.

  The first light source unit 43 includes an array light source in which a plurality of semiconductor lasers (laser light sources) 47 are two-dimensionally arranged. Specifically, a plurality of semiconductor lasers 47 are arranged in an array in a plane orthogonal to the optical axis AX1. The optical axis of the first light source unit 43 is defined as an optical axis AX1. In addition, an optical axis of a second light source unit 45 described later is an optical axis AX2. The optical axis AX1 and the optical axis AX2 are in the same plane and are orthogonal to each other.

  On the optical axis AX1, the first light source unit 43, the lens array 44, the afocal optical system 23, the homogenizer optical system 24, the polarization separation element 25, the integrator optical system 31, the polarization conversion element 32, The superimposing optical system 33 is arranged in this order. Further, on the optical axis AX2, the second light source unit 45, the collimator optical system 46, the condenser lens 28, the diffuser 29, the collimating lens 30, the polarization separation element 25, the pickup optical system 26, The fluorescent light emitting elements 27 are arranged in this order.

  The semiconductor laser 47 emits blue light (excitation light) BL having a peak wavelength in a wavelength region of 440 to 480 nm, for example. Then, the blue light BL emitted from each semiconductor laser 47 enters the lens array 44.

  The lens array 44 includes a plurality of focusing lenses 48 arranged two-dimensionally. Specifically, the plurality of focusing lenses 48 are arranged in an array in a plane orthogonal to the optical axis AX1 so that the plurality of focusing lenses 48 are positioned at positions corresponding to the plurality of semiconductor lasers 47, respectively. Yes.

  Here, the relationship between the semiconductor laser 47 and the focusing lens 48 will be described with reference to FIGS. In this specification, a state where the semiconductor laser 47 is disposed at a position shifted from the front focal point of the focusing lens 48 is referred to as a defocused state. The distance between the position of the semiconductor laser 47 and the front focal point of the focusing lens 48 is referred to as the defocus amount of the semiconductor laser 47. When the defocus amount of the semiconductor laser 47 is 0 (zero), the semiconductor laser 47 is not in the defocus state.

  FIG. 3 is a plan view showing the positional relationship between the semiconductor laser 47 and the focusing lens 48 when the semiconductor laser 47 is in the defocused state. FIG. 4 is an optical path diagram of the blue light BL when the semiconductor laser 47 is in the defocused state. FIG. 5 is an optical path diagram of the blue light BL when the semiconductor laser 47 is in a defocused state and is decentered. FIG. 6 is an optical path diagram of the blue light BL when the defocus amount of the semiconductor laser 47 is varied.

  In the first light source device 41 of the present embodiment to which the present invention is applied, as shown in FIG. 3, a surface (main surface) that passes through the principal point Q of the focusing lens 48 and is orthogonal to the optical axis of the focusing lens 48. ) Is the reference plane T, the distance S1 from the semiconductor laser 47 to the reference plane T is set to be longer than the distance S2 from the front focal point P of the focusing lens 48 to the reference plane T.

 One semiconductor laser 47 in the defocused state is the first light source of the present invention. Of the plurality of focusing lenses 48, the focusing lens 48 corresponding to the first light source is the first lens of the present invention. The blue light BL emitted from the first light source is the first light flux of the present invention. Of the plurality of semiconductor lasers 47, the other semiconductor laser 47 is the second light source of the present invention. Of the plurality of focusing lenses 48, the focusing lens 48 corresponding to the second light source is the second lens of the present invention. The blue light BL emitted from the second light source is the second light flux of the present invention.

  Thus, the semiconductor laser 47 is disposed at a position shifted from the front focal point in the optical axis direction of the focusing lens 48. As a result, the blue light BL emitted from each semiconductor laser 47 becomes a focused light beam that is focused on the respective optical axis ax by each focusing lens 48, as shown in FIG.

  In the conventional projector, the collimator lens used in place of the focusing lens 48 of the present invention is a lens for collimating the light emitted from the semiconductor laser. That is, the distance from the semiconductor laser to the reference surface is matched with the distance from the front focal point of the collimator lens to the reference surface.

  In the first light source device 41 of the present embodiment to which the present invention is applied, as shown in FIG. 5, the optical axis ax of the blue light BL emitted from the semiconductor laser 47 is set to the focusing lens 48 corresponding to the semiconductor laser 47. The optical axis bx is eccentric (separated).

  In this specification, a state where the optical axis ax of the blue light BL does not coincide with the optical axis bx of the focusing lens 48 is referred to as a state where the blue light BL is eccentric with respect to the focusing lens 48. A distance between the optical axis ax and the optical axis bx on the main surface of the focusing lens 48 is referred to as an eccentricity amount. The blue light incident on the converging lens 48 in which the optical axis ax and the optical axis bx are decentered corresponds to “one beam” of the present invention.

  Specifically, in the lens array 44, as the distance from the optical axis AX1 (center of the lens array 44) increases, the amount of eccentricity of the blue light BL incident on the converging lens 48 tends to move away from the optical axis AX1. Is getting bigger. That is, in this lens array 44, the eccentricity of the blue light BL incident on the focusing lens 48 positioned on the peripheral side is larger than the eccentricity amount of the blue light BL incident on the focusing lens 48 positioned on the central side. The amount is larger.

  In this case, the angle at which the optical axis ax is refracted with respect to the optical axis bx of the converging lens 48 increases as the decentering amount of the converging luminous flux of the blue light BL emitted from the converging lens 48 increases. Thereby, the focused light beam of the blue light BL emitted from the focusing lens 48 is inclined toward the predetermined direction (optical axis AX1) by inclining the optical axis ax at an angle corresponding to the amount of eccentricity.

  On the other hand, with respect to the focusing lens 48 positioned at the center of the lens array 44, the optical axis ax of the blue light BL incident on the first focusing lens 48 is decentered with respect to the optical axis bx of the focusing lens 48. Absent. Therefore, the focused light beam of the blue light BL emitted from the focusing lens 48 is focused on the optical axis AX1 without tilting the optical axis ax.

  In the configuration shown in FIG. 5, the defocus amount of each semiconductor laser 47 is set to the same value. Therefore, a plurality of blue lights emitted in parallel with the optical axis AX1 from the plurality of semiconductor lasers 47 are deflected so as to approach the optical axis AX1 due to the eccentric effect, but the positions at which the blue lights BL are focused are They are different from each other.

  However, by adjusting the eccentricity amount of each blue light BL and the defocus amount of each semiconductor laser 47, a position where the plurality of blue lights BL intersect each other and a position where each blue light converges can be arbitrarily set. Can be set.

   FIG. 6 shows another example of the first light source device that can focus each blue light BL on the same position. In the first light source device 53 shown in FIG. 6, the defocus amount of the semiconductor laser 47 is smaller as the distance from the optical axis AX1 (center of the lens array 44) of the focusing lens 48 is longer. That is, the defocus amount of the semiconductor laser 47 corresponding to the focusing lens 48 positioned on the center side of the lens array 44 is equal to the defocus amount of the semiconductor laser 47 corresponding to the focusing lens 48 positioned on the peripheral side of the lens array 44. Is bigger than.

  The defocus amount of the semiconductor laser 47 is represented by the difference (S1−S2) between the distance S1 from the semiconductor laser 47 to the reference plane T and the distance S2 from the front focal point P of the focusing lens 48 to the reference plane T. The larger the difference, the shorter the distance from the focusing lens 48 to the focusing position.

 According to the first light source device 53, a plurality of blue lights BL transmitted through the lens array 44 are crossed (condensed) at one point on the optical axis AX1, and the blue lights BL are converged at the same position. it can. Further, in the first light source device 53, blue light BL having a higher degree of parallelism than the first light source device 41 illustrated in FIG. 5 is emitted from the afocal optical system 23.

  The focused light beam of the blue light BL emitted from the lens array 44 enters the afocal optical system 23. The afocal optical system 23 is for obtaining a parallel luminous flux of the blue light BL whose spot diameter (size) is adjusted. The afocal optical system 23 includes an afocal lens 23a including at least one lens. In the configuration shown in FIGS. 5 and 6, an afocal lens 23a made of a convex lens is used. And this afocal lens 23a is arrange | positioned rather than the position where several blue light BL cross | intersects on optical axis AX1.

  In the first light source device 41 and the first light source device 53 of the present embodiment, the above-described lens array 44 converts each of the plurality of blue lights BL from the first light source unit 43 into a focused light beam, and further Since it has a function of deflecting the focused light beam in a predetermined direction (optical axis AX1), it is not necessary to collect the blue light collimated by the collimator optical system by the condensing lens as in the prior art. Therefore, by using the first light source device 41 or the first light source device 53, the condenser lens can be omitted, and the device can be reduced in size and weight.

  In the first light source device 41 and the first light source device 53 of the present embodiment, the condensing afocal lens constituting the afocal optical system 23 can be omitted. Therefore, the afocal optical system 23 can be downsized.

  Further, in the afocal optical system 23, an afocal lens 23b made of a concave lens as shown in FIG. 7 can be used. In this case, since the afocal lens 23b is disposed on the front side of the position where the plurality of blue lights BL intersect on the optical axis AX1, the afocal lens 23a including the convex lens shown in FIGS. 5 and 6 is used. The afocal optical system 23 can be further reduced in size as compared with the case where it is present.

  The blue light BL collimated by the afocal optical system 23 described above is incident on the homogenizer optical system 24 as shown in FIG. The homogenizer optical system 24 converts the light intensity distribution of the blue light BL into a uniform state (so-called top hat distribution). The homogenizer optical system 24 includes, for example, a pair of multi-lens arrays 24a and 24b. The blue light BL emitted from the homogenizer optical system 24 enters the polarization separation element 25.

  The polarization separation element 25 includes, for example, a first dichroic mirror 25a and a second dichroic mirror 25b. The first dichroic mirror 25a and the second dichroic mirror 25b intersect each other at an angle of 90 °, and are arranged in an inclined state with respect to the optical axes AX1 and AX2 at an angle of 45 °. .

  The first dichroic mirror 25a is provided with a wavelength-selective polarization separation film (not shown) that reflects the blue light BL and transmits light other than the blue light BL. On the other hand, the second dichroic mirror 25b is provided with a wavelength selective polarization separation film (not shown) that reflects yellow light (fluorescent light) YL, which will be described later, and transmits light other than the yellow light YL. ing. The polarization separating element 25 is not limited to the configuration using the dichroic mirrors 25a and 25b, and may be configured using a dichroic prism.

  Therefore, the blue light BL incident on the first dichroic mirror 25 a from the above-described homogenizer optical system 24 is reflected toward the pickup optical system 26.

  The pickup optical system 26 condenses the blue light BL toward the fluorescent light emitting element 27. The pickup optical system 26 includes, for example, two pickup lenses 26a and 26b. The blue light BL collected by the pickup optical system 26 enters the fluorescent light emitting element 27.

  The fluorescent light emitting element 27 has a phosphor layer 27a and a substrate (base material) 27b that supports the phosphor layer 27a. The phosphor layer 27a includes a phosphor that is excited by absorbing the blue light BL. The phosphor excited by the blue light BL is, for example, yellow light (fluorescent light) having a peak wavelength in a wavelength region of 500 to 700 nm. ) YL is emitted. On the other hand, the surface of the substrate 27b facing the phosphor layer 27a is a reflecting surface, and the yellow light YL is reflected toward the pickup optical system 26.

  The fluorescent light emitting element 27 may be configured to rotate the substrate 27b. In this case, the blue light BL is irradiated to the phosphor layer 27a arranged concentrically on the substrate 27b. Thereby, yellow light YL can be emitted, changing the irradiation position of the blue light BL with respect to the fluorescent substance layer 27a.

  The yellow light YL emitted from the fluorescent light emitting element 27 described above passes through the pickup optical system 27 again and then enters the polarization separation element 25. Then, the yellow light YL incident on the second dichroic mirror 25 b is reflected toward the integrator optical system 29.

  The second light source unit 45 includes an array light source in which a plurality of semiconductor lasers (laser light sources) 49 are two-dimensionally arranged. Specifically, a plurality of semiconductor lasers 49 are arranged in an array in a plane orthogonal to the optical axis AX2.

  Similar to the semiconductor laser 47, the semiconductor laser 49 emits blue light BL having a peak wavelength in a wavelength region of 440 to 480 nm, for example. Then, the blue light BL emitted from each semiconductor laser 49 enters the collimator optical system 46.

  The collimator optical system 46 includes a plurality of collimator lenses 50 arranged two-dimensionally. Specifically, the plurality of collimator lenses 50 are arranged in an array in a plane orthogonal to the optical axis AX2 so that each of the plurality of collimator lenses 50 is positioned at a position corresponding to each of the plurality of semiconductor lasers 49. Has been placed.

  The collimator lens 50 is for collimating the blue light BL emitted from the semiconductor laser 49. Then, the blue light BL emitted from the semiconductor laser 49 becomes a parallel light beam by passing through the collimator lens 50.

  The parallel luminous flux of the blue light BL collimated by the collimator optical system 46 enters the condenser lens 28. The condensing lens 28 condenses the blue light BL toward the diffuser 29. The blue light BL condensed by the condenser lens 28 enters the diffuser 29.

  The diffuser 29 has a function of suppressing speckle generation by scattering the blue light BL that is coherent light. The blue light BL scattered by the diffuser 80 enters the collimating lens 30.

  The collimating lens 30 is for collimating the blue light BL collected by the condenser lens 28 described above. The blue light BL collimated by the collimating lens 30 enters the polarization separation element 25. The blue light BL incident on the first dichroic mirror 25 a is reflected toward the integrator optical system 31.

  Therefore, the polarized light separating element 25 obtains illumination light (white light) WL in which the blue light BL reflected by the first dichroic mirror 25a and the yellow light YL reflected by the second dichroic mirror 25b are mixed. It is done. The illumination light WL is incident on the integrator optical system 31.

  The integrator optical system 31 makes the luminance distribution (illuminance distribution) uniform. The integrator optical system 31 includes a pair of fly-eye lenses 31a and 31b. The fly-eye lenses 31a and 31b are made up of a plurality of lenses arranged in an array. The illumination light WL whose luminance distribution is made uniform by passing through the integrator optical system 31 enters the polarization conversion element 32.

  The polarization conversion element 32 aligns the polarization direction of the illumination light WL. The polarization conversion element 32 is composed of, for example, a combination of a polarization separation film and a phase difference plate. The illumination light WL whose polarization direction is aligned by passing through the polarization conversion element 32 enters the superimposing optical system 33.

  The superimposing optical system 33 includes a superimposing lens 33a. The illumination light WL is superimposed by passing through the superimposing lens 33a, the luminance distribution is made uniform, and the axial symmetry about the light axis is enhanced. The illumination light WL emitted from the superimposing optical system 33 enters the color separation optical system 3 shown in FIG.

  In the illumination device 2 having the above-described configuration, the lens array 44 described above converts each of the plurality of blue lights BL from the first light source unit 43 into a focused light beam, and further converts the plurality of focused light beams into a predetermined direction ( Since it has a function of deflecting toward the optical axis AX1), it is not necessary to condense the blue light collimated by the collimator optical system by the condenser lens as in the prior art. Therefore, according to the illuminating device 2, a condensing lens is abbreviate | omitted and reduction in size and weight of an apparatus can be achieved. Moreover, according to the illuminating device 2, since the condensing afocal lens which comprises the afocal optical system 23 can also be abbreviate | omitted, size reduction of the afocal optical system 23 is also possible.

  Therefore, when such an illumination device 2 is used in the projector 1, it is possible to perform display with excellent image quality while reducing the size and weight of the illumination device 2 and the projector 1.

  In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

  The defocus amount of the semiconductor laser 47 can be adjusted by changing the distance between the semiconductor laser 47 and the focusing lens 48. For example, the defocus amount of the semiconductor laser 47 can be adjusted by shifting the position of one semiconductor laser 47 from the position of the other semiconductor laser 47 in a direction parallel to the optical axis AX1. Alternatively, the defocus amount of the semiconductor laser 47 can be adjusted by shifting the position of one focusing lens 48 from the position of the other focusing lens 48 in a direction parallel to the optical axis AX1.

 Further, the distance between one semiconductor laser 47 and the focusing lens 48 corresponding to the one semiconductor laser 47 is made equal to the distance between the other semiconductor laser 47 and the focusing lens 48 corresponding to the other semiconductor laser 47. The defocus amount of the semiconductor laser 47 can also be adjusted by making the refractive power of one focusing lens 48 different from the refractive power of the other focusing lens 48.

  As a method of deflecting each of the plurality of blue lights BL emitted from the plurality of semiconductor lasers 47 in a predetermined direction (optical axis AX1), the above-described blue light optical axis ax is used as the optical axis of the focusing lens 48. In addition to the method of decentering (separating) from bx, a method of tilting the optical axis ax of the blue light BL with respect to the optical axis bx of the focusing lens 48 may be used. That is, by making the blue light BL incident on the optical axis bx of the converging lens 48 from an oblique direction, the optical axis ax of the blue light BL emitted from the converging lens 48 can be tilted.

  Further, in the present invention, the blue light emitted from the focusing lens 48 is shaped according to the shape of the lens surface of the focusing lens 48 without decentering the optical axis ax of the blue light BL with respect to the optical axis bx of the focusing lens 48. The optical axis of BL can also be tilted. Furthermore, in the present invention, a cylindrical lens may be used instead of the focusing lens 48 described above.

  In the projector described in the present embodiment, the light emitted from the first light source device is incident on the afocal optical system 23. However, the light emitted from the first light source device is desired in the phosphor layer 27a. You may make it inject into the area | region of this area directly. In this case, by adjusting the defocus amount of the semiconductor laser 47 and the eccentricity amount of each blue light BL, the area of the region irradiated with light can be easily adjusted to a desired size. Further, in a projector of a type that forms image light by laser light emitted from the semiconductor laser 47, for example, in order to reduce speckle due to laser light, light emitted from the first light source device is desired for the diffusion plate. You may make it inject into the area | region of this area. By using the light source device according to the present invention, it is possible to irradiate the object to be illuminated with laser light that is appropriately condensed (not excessively condensed), and thus it is possible to suppress deterioration of the object to be illuminated.

  DESCRIPTION OF SYMBOLS 1 ... Projector 2 ... Illuminating device 3 ... Color separation optical system 4R, 4G, 4B ... Light modulation device 5 ... Synthesis optical system 6 ... Projection optical system 7a ... 1st dichroic mirror 7b ... 2nd dichroic mirror 8a ... 1st Total reflection mirror 8b ... second total reflection mirror 8c ... third total reflection mirror 9a ... first relay lens 9b ... second relay lens 10R, 10G, 10B ... field lens 21A ... first light source unit 45 1st light source part 47, 49 ... Semiconductor laser 44 ... Lens array 46 ... Collimator optical system 23 ... Afocal optical system 24 ... Homogenizer optical system 25 ... Polarization separation element 26 ... Pickup optical system 27 ... Fluorescent light emitting element 28 ... Collection Optical lens 29 ... Diffuser 30 ... Parallelizing lens 31 ... Integrator optical system 32 ... Polarized light Replacement element 33 ... Superimposing optical system 41, 53 ... First light source device 42 ... Second light source device SCR ... Screen WL ... Illumination light (white light) LR ... Red light LG ... Green light LB ... Blue light BL ... Blue light (Excitation light) YL ... Yellow light (Fluorescent light) Q ... Main point T ... Reference plane

Claims (8)

An array light source including a plurality of light sources including a first light source that emits a first light flux and a second light source that emits a second light flux ;
A first lens on which the first light flux is incident;
A second lens on which the second light flux is incident,
The first light source and the second light source are provided so as to sandwich the optical axis of the array light source,
Through principal point of the first lens, and a plane perpendicular to the optical axis of the first lens when the first reference plane, from the first light source to said first reference surface distance is longer than the distance from the front focal point of the first lens to said first reference surface,
When a surface passing through the principal point of the second lens and orthogonal to the optical axis of the second lens is defined as a second reference surface, the second light source to the second reference surface. The distance is longer than the distance from the front focal point of the second lens to the second reference plane;
The optical axis of the first luminous flux is separated from the optical axis of the first lens;
The optical axis of the second light flux is separated from the optical axis of the second lens;
The light source device characterized in that the first light beam transmitted through the first lens and the second light beam transmitted through the second lens intersect each other on the optical axis of the array light source. . The array light source, the light source apparatus according to claim 1, wherein the plurality of light sources, which are two-dimensionally arranged. The light source device according to claim 2 , further comprising a lens array in which a plurality of lenses including the first lens and the second lens are two-dimensionally arranged. Said first said lens is transmitted through the first light flux, according to claim 1 to 3 in which said second lens and the second light flux transmitted through the, is characterized in that it comprises an afocal optical system for incident The light source device according to any one of the above. The light source apparatus according to claim 4 , wherein the afocal optical system includes a concave lens. Wherein the plurality of intersection of a plurality of light beams is a point irradiated by the light source and the light source according to any one of claim 1 to 5, wherein each of the plurality of light beams, characterized in that it is focused at a point apparatus. Wherein the plurality of light sources, a light source device according to any one of claim 1 to 6, characterized in that a solid-state light source. The light source device according to any one of claims 1 to 7 ,
A light modulation device that modulates light emitted from the light source device according to image information;
And a projection optical system that projects the light modulated by the light modulation device.

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