JP2023057372A - Light source device and projector - Google Patents

Abstract

To provide a light source device that suppresses a decrease in the diffusion accuracy of light due to diffusion elements and a decrease in the brightness of a projector.SOLUTION: A light source device according to the present invention comprises: a plurality of light emission units including a first light emission unit for emitting a first light and a second light emission unit for emitting a second light; a light condensing optical system which a plurality of lights emitted respectively from the plurality of light emission units enter, and which condense the plurality of lights in an optical element while being separate from each other; and a plurality of diffusion elements including a first diffusion element that diffuses at least the first light emitted from the light condensing optical system and a second diffusion element that diffuses at least the second light emitted from the light condensing optical system and separate from the first light.SELECTED DRAWING: Figure 2

Description

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

A light source device used in an image display device such as a projector includes a semiconductor laser (Laser Diode; LD) that emits blue light and a phosphor that converts at least part of the blue light emitted from the LD into yellow light. A combined light source device may be used.

For example, the light source device disclosed in Patent Document 1 includes an array light source composed of a plurality of LDs and a plurality of collimator lenses, a condenser lens that collects light emitted from the array light source, and a condenser lens that condenses light. a phosphor wheel on which the emitted light is incident. Further, in Patent Document 2, as a suitable light source for increasing the brightness of the light source device, a light source in which four LD elements are concentrated in a predetermined area on a substrate so as to constitute one light emitting portion is disclosed. disclosed. In the light source device having the various light sources described above, at least part of the light emitted from each light source may be diffused by a diffusion element for the purpose of adjusting the beam shape of the light before irradiating the phosphor.

JP 2017-167528 A JP 2020-095939 A

In the light source device disclosed in Patent Document 1, light emitted from a plurality of array light sources is incident on one common diffusion plate (diffusion element). When a light source in which a plurality of light emitting parts are arranged on a substrate with a space therebetween as disclosed in the above-mentioned Patent Document 2 is used, the light flux emitted from each light emitting part A gap occurs in the The gap overlaps with a region on the substrate where no light emitting unit is arranged, that is, a region of only the substrate when viewed along the light beams of the plurality of luminous fluxes. For example, even if a plurality of luminous fluxes are condensed by a condensing element such as a condensing lens, the beam area of the entire luminous flux is limited to only one light-emitting portion in the area where the diffusion plate is arranged on the light source side of the condensing position. Since it spreads compared with the case where it is configured, a large diffusion plate is required. An increase in the size of the diffusion element of the light source device may lead to a decrease in the light diffusion accuracy of the diffusion element, resulting in a reduction in the brightness of the projector provided with the light source device.

In order to solve the above problems, a light source device according to one aspect of the present invention provides a plurality of light emitting units including a first light emitting unit that emits first light and a second light emitting unit that emits second light. a condensing optical system in which a plurality of lights emitted from each of the plurality of light emitting units are incident and condensed on an optical element in a state in which the plurality of lights are spaced apart from each other; A plurality of diffusion elements including a first diffusion element that diffuses one light and a second diffusion element that diffuses at least a second light separated from the first light emitted from the condensing optical system.

1 is a schematic configuration diagram of a projector according to a first embodiment; FIG. FIG. 2 is a side view of a white light generator of a light source device included in the projector of FIG. 1; FIG. 3 is a schematic diagram showing a correspondence relationship between a light emitting section and a diffusion element in a part of the light source device shown in FIG. 2; It is a schematic diagram which shows the correspondence of a light emission part and a diffusion element in a part of light source device of 2nd Embodiment. It is a schematic diagram which shows the correspondence of a light emitting part and a diffusion element in a part of light source device of 3rd Embodiment. It is a schematic diagram which shows the correspondence of a light emission part and a diffusion element in a part of light source device of 4th Embodiment. It is a schematic diagram which shows the correspondence of a light emitting part and a diffusion element in a part of light source device of the modification of 4th Embodiment. It is a schematic diagram which shows the correspondence of a board|substrate, a light emission part, and a diffusion element in a part of light source device of 5th Embodiment. FIG. 11 is a schematic diagram showing the correspondence relationship between a substrate, a light emitting section, and a diffusion element in a part of the light source device of the sixth embodiment; FIG. 11 is a schematic diagram showing the correspondence relationship between a substrate, a light emitting section, and a diffusion element in a part of the light source device of the seventh embodiment; FIG. 20 is a schematic diagram showing a correspondence relationship between a substrate, a light emitting section, and a diffusion element in a part of the light source device of the eighth embodiment; FIG. 20 is a schematic diagram showing a correspondence relationship between a substrate, a light emitting section, and a diffusion element in a part of the light source device of the ninth embodiment; FIG. 21 is a side view of a white light generator of a light source device included in a projector according to a tenth embodiment; FIG. 21 is a side view of a white light generator of a light source device included in a projector according to a tenth embodiment; FIG. 20 is a schematic diagram showing a correspondence relationship between a substrate, a light emitting section, and a diffusion element in a part of the light source device of the tenth embodiment; FIG. 20 is a schematic diagram showing how the angle of the diffusion element of the light source device of the tenth embodiment is adjusted.

[First embodiment]
A first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG.
FIG. 1 is a schematic diagram showing the configuration of the projector 5 of the first embodiment. The projector 5 is a projector using a liquid crystal panel as an optical modulation device. In each of the drawings below, the scale of the dimensions may be changed depending on the component in order to make each component easier to see.

(projector)
As shown in FIG. 1, the projector 5 includes a light source device 50, a color separation optical system 200, field lenses 300R, 300G, and 300B, light modulation devices 400R, 400G, and 400B, a cross dichroic prism 500, and a projection optical system. 600; The light source device 50 emits white light (light) WL including red light R, green light G, and blue light B. FIG.

The light source device 50 includes a white light generator 100</b>A, a first lens array 70 , a second lens array 80 , a polarization conversion element 92 and a superimposing lens 94 . The white light generator 100A emits white light WL composed of blue light LB and yellow light LY. The configuration of the white light generator 100A will be described later.

The white light WL generated by the white light generator 100A is collimated and enters the first lens array 70 . The first lens array 70 has a plurality of small lenses 71 for splitting the white light WL emitted from the white light generator 100A into a plurality of partial light beams. A plurality of small lenses 71 are arranged in a matrix in a plane perpendicular to the optical axis AX50 of the light source device 50 .

The second lens array 80 has a plurality of small lenses 81 corresponding to the plurality of small lenses 71 of the first lens array 70 . The second lens array 80, together with the superimposing lens 94, forms an image of each small lens 71 of the first lens array 70 in the vicinity of each image forming area of the light modulators 400R, 400G, and 400B. A plurality of small lenses 81 are arranged in a matrix in a plane perpendicular to the optical axis AX50.

The polarization conversion element 92 converts the partial light flux emitted from the second lens array 80 into linearly polarized light. The polarization conversion element 92 has a polarization separation layer, a reflection layer, and a retardation plate. The polarization separation layer of the polarization conversion element 92 transmits one of the linearly polarized components included in the partial light flux emitted from the second lens array 80, and transmits the other linearly polarized component perpendicular to the optical axis AX50. directionally reflected. The reflective layer of the polarization conversion element 92 reflects the other linearly polarized light component reflected by the polarization separation layer in a direction parallel to the optical axis AX50. The retardation plate of the polarization conversion element 92 converts the other linear polarization component reflected by the reflective layer into one linear polarization component.

The superimposing lens 94 converges the partial light beams from the polarization conversion element 92 and superimposes them in the vicinity of the image forming regions of the light modulators 400R, 400G, and 400B. The first lens array 70, the second lens array 80, and the superimposing lens 94 constitute an integrator optical system that uniforms the in-plane light intensity distribution of the white light WL emitted from the light source device 50 in the image forming area.

The color separation optical system 200 includes dichroic mirrors 210 and 220 , reflecting mirrors 230 , 240 and 250 and relay lenses 260 and 270 . The color separation optical system 200 separates the white light WL emitted from the light source device 50 into red light R, green light G, and blue light B, and converts the red light R, green light G, and blue light B into corresponding light beams. Light is guided to modulators 400R, 400G, and 400B.

The dichroic mirror 210 passes the red light R of the incident white light WL, and reflects the green light G and the blue light B. FIG. The dichroic mirror 220 reflects the green light G out of the incident green light G and blue light B and allows the blue light B to pass therethrough. The reflecting mirror 230 reflects almost all of the incident red light R. As shown in FIG. Each of the reflecting mirrors 240 and 250 reflects almost all of the blue light B that enters.

The field lenses 300R, 300G, 300B are arranged between the color separation optical system 200 and the light modulators 400R, 400G, 400B. As described above, the red light R reflected by the reflecting mirror 230 passes through the field lens 300R and enters the image forming area of the light modulator 400R. The green light G reflected by the dichroic mirror 220 passes through the field lens 300G and enters the image forming area of the light modulator 400G. The blue light B reflected by the reflecting mirror 250 passes through the field lens 300B and enters the image forming area of the light modulator 400B.

Each of the light modulators 400R, 400G, and 400B is composed of a liquid crystal panel that modulates incident red light R, green light G, and blue light B according to image information to form an image. . The operation mode of the liquid crystal panel may be any of TN mode, VA mode, horizontal electric field mode, etc., and is not limited to any particular mode. Each of the light modulators 400R, 400G, and 400B includes an incident-side polarizing plate (not shown) arranged on the light incident surface side and an exit-side polarizing plate (not shown) arranged on the light exit surface side. .

The cross dichroic prism 500 synthesizes image light emitted from each of the light modulators 400R, 400G, and 400B to form a color image. The cross dichroic prism 500 is configured by bonding four rectangular prisms together and has a substantially cubic shape. In the cross dichroic prism 500, a dielectric multi-layer film (not shown) is formed on the substantially X-shaped interface in side view formed by bonding the rectangular prisms together.

A color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form an image on the screen SCR.

(white light generator)
Next, the white light generator 100A of the light source device 50 of the projector 5 described above will be described.

FIG. 2 is a plan view of the white light generator 100A of the first embodiment. As shown in FIG. 2, the white light generation section 100A includes at least a light emitting device 110A, a condensing optical system 120, and a plurality of diffusion elements 130, and further includes a rotating fluorescent plate 40 and a pickup optical system 60. Prepare.

110 A of light-emitting devices are provided with the board|substrate 113 and several light-emitting parts 140. As shown in FIG. 110 A of light-emitting devices are provided with the two light emission parts 141 and 142 as several light emission parts 140. FIG. The plurality of light-emitting units 140 are arranged in predetermined areas separated from each other on the surface 113 a of the rectangular substrate 113 . Each of the plurality of light-emitting portions 140 is provided in a corresponding predetermined region on the surface 113a of the substrate 113 with the holding portion 112 interposed therebetween. The holding portion 112 may be a frame material that protects the light emitting portion 140 from the surroundings. The holding portion 112 holding each of the plurality of light emitting portions 140 may incorporate electronic components, wiring, and the like (not shown) for supplying a predetermined voltage signal to the LD 180 of the light emitting portion 140 . Note that the holding portion 112 may be omitted, and the LD 180 may be formed directly on the substrate 113 .

Each of the multiple light emitting units 140 is configured by one or more LDs 180 . An arbitrary number of LDs 180 are arranged one-dimensionally or two-dimensionally in each of the plurality of light emitting units 140 . In this specification, the direction parallel to the optical axis AX100 of the light emitted from each of the plurality of light emitting units 140 is defined as the Z direction, the relatively one side of the Z direction is defined as the +Z side, and the relative direction of the Z direction is defined as the +Z side. The other side is called the -Z side. One direction perpendicular to the Z direction is defined as the X direction, one side of the X direction is defined as the +X side, and the other side of the X direction is defined as the -X side. Further, a direction that exists in the same plane as the X direction and is perpendicular to both the X direction and the Z direction is defined as the Y direction, one side of the Y direction is defined as the +Y side, and the other side of the Y direction is defined as the +Y side. side is called the -Y side.

In the first embodiment, the number of LDs 180 arranged in each of the plurality of light emitting units 140 in the X direction and the number of the LDs 180 in the Y direction are not particularly limited. Two or more LDs 180 are arranged in the Y direction. That is, in each of the plurality of light emitting units 140, the plurality of LDs 180 are arranged one-dimensionally along the Y direction.

The light emitting units 141 and 142 are arranged apart from each other in the X direction. The light emitting section 142 is arranged on the +X side of the light emitting section 141 . The light emitting unit (first light emitting unit) 141 emits blue light (first light) LB1. The light emitting unit (second light emitting unit) 142 emits blue light (second light) LB2. The blue light(s) LB1 and LB2 are spaced apart from each other in the X direction. Each of the blue lights LB<b>1 and LB<b>2 travels toward the +Z side in parallel with the Z direction and enters the common condensing optical system 120 .

The condensing optical system 120 converges the incident blue lights LB1 and LB2 onto the phosphor layer (optical element) 42 of the rotating phosphor plate 40 . The condensing optical system 120 is composed of, for example, a condensing lens 121 having a convex surface that moves toward the -Z side from the outer periphery toward the center of the optical axis, and an XY plane that is parallel to the X and Y directions.

A plurality of diffusing elements 130 are arranged between the condensing optical system 120 and the rotating fluorescent plate 40 in the Z direction. The plurality of diffusing elements 130 comprises two diffusing elements 131,132. The diffusion element (first diffusion element) 131 diffuses the blue light LB1 emitted from the condensing optical system 120 and irradiates it onto a predetermined region of the phosphor layer 42 . The diffusing element (second diffusing element) 132 diffuses the blue light LB2 emitted from the condensing optical system 120, and irradiates the phosphor layer 42 with the same predetermined region as the region irradiated with the blue light LB1. That is, the blue light beams LB1 and LB2 emitted from the two light emitting units 141 and 142 are not diffused by one common diffuser element as in the conventional art, but are diffused by two separate diffuser elements 131 and 131, respectively. 132 diffuses.

The light emitting units 141 and 142 are arranged at a position PS1 in the Z direction, while the diffusion elements 131 and 132 are arranged at a position PS2 on the +Z side of the position PS1 in the Z direction. The diffusing elements 131, 132 are arranged one on top of the other in the Z direction and spaced apart from each other in the X direction. That is, the diffusion surfaces of the diffusion elements 131 and 132 are arranged substantially parallel to the XY plane.

The rotating fluorescent plate 40 includes a disc 41 , a fluorescent layer 42 and a dichroic film 43 . The disk 41 is configured to be rotatable around the optical axis AX100 by a motor (not shown). The disk 41 is made of a material that transmits blue light. Examples of materials for the disk 41 include quartz glass, crystal, sapphire, optical glass, and transparent resin.

The phosphor layer 42 is arranged on the +Z side surface of the disc 41 via a dichroic film 43, and is arranged on a predetermined radial region and a circle of the disc 41 around the rotation axis RX on the +X side of the optical axis AX100. It is provided along the circumferential direction of the plate 41 . The phosphor layer 42 is composed of, for example, a layer containing (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ :Ce, which is a type of YAG phosphor.

The phosphor layer 42 functions as a wavelength conversion element, and generates yellow light LY by using part of the blue lights LB1 and LB2 of the blue lights LB1 and LB2 condensed by the condensing optical system 120 as excitation light. At least part of the remaining blue light LB of the blue lights LB1 and LB2 is transmitted through the phosphor layer 42 . That is, the phosphor layer 42 emits blue light LB toward the +Z side and yellow light LY toward the ±Z side.

The dichroic film 43 is provided between the phosphor layer 42 and the disk 41, transmits the blue light LB1 and LB2, which are laser beams, and reflects the yellow light LY. As a result, the rotating phosphor plate 40 synthesizes the blue light LB passing through the phosphor layer 42 and the yellow light LY emitted from the phosphor layer 42, and emits white light WL toward the pickup optical system 60. .

The pickup optical system 60 includes lenses 61 , 62 and 63 and collimates the white light WL emitted from the rotating fluorescent plate 40 . The lenses 61, 62, 63 are arranged in order from the -Z side to the +Z side along the Z direction. Each of the lenses 61, 62, and 63 has, for example, a plane parallel to the XY plane and a convex surface that moves toward the +Z side from the outer periphery of the plane toward the center overlapping the optical axis AX100. The convex curvatures and shapes of the lenses 61, 62, 63 are different from each other. The sizes of the lenses 61, 62, 63 in the X direction and the Y direction are different from each other.

The respective optical axes of the condensing optical system 120 and the pickup optical system 60, and the center of the phosphor layer 42 on the XY plane overlap with the common optical axis AX100. The optical axis AX100 is the same as the optical axis AX50 shown in FIG. If necessary, a mirror (not shown) may be arranged on the +Z side of the pickup optical system 60 to overlap the optical axis AX50 after the optical axis AX100 is folded back.

FIG. 3 is a schematic diagram showing the correspondence relationship between the light emitting units 141 and 142 and the diffusion elements 131 and 132. As shown in FIG. In FIG. 3, the light emitting units 141 and 142 are indicated by solid lines, and the diffusion elements 131 and 132 in a state where the position PS2 in FIG. is indicated by a two-dot chain line. When viewed along the Z direction as shown in FIG. 3, each of the light emitting units 141 and 142 has a long side (first long side) La parallel to the Y direction and a short side (first long side) La parallel to the X direction. 1 short side (Lb), and is formed in a rectangular shape longer in the Y direction than in the X direction. A plurality of LDs 180 are arranged one-dimensionally along a direction parallel to the long side La in each of the plurality of light emitting portions 140 . In the first embodiment, the direction parallel to the long side La is the Y direction.

Each of diffusion elements 131 and 132 corresponds to each of light emitting portions 141 and 142 . In this specification, "the diffusing element corresponds to the light emitting section" means that the diffusing element optically displaced from the position PS2 to the position PS1 overlaps the light emitting section on the XY plane including the X direction and the Y direction of the position PS1. , and at the position PS2, the irradiation range of the blue light emitted from the light emitting portion and the diffusing element overlap each other. In addition, “overlapping” means a state in which at least part of a component such as a light emitting unit to be compared is included within the range of a component such as a light emitting unit used as a reference in the X direction or Y direction.

For example, “the light emitting portions 141 and 142 overlap each other” means that the short sides Lb and Lb on the +Y side of the two light emitting portions 141 and 142 are the same in the Y direction (second direction) as shown in FIG. position, or the state where the short sides Lb, Lb on the -Y side of the two light emitting units 141, 142 are at the same position in the Y direction (second direction), and also the ±Y side of the light emitting unit 142. A state in which either of the short sides Lb and Lb of is arranged in the Y direction between the short side Lb on the +Y side and the short side Lb on the -Y side of the light emitting section 141 is also included.

In the first embodiment, the sizes of the two light emitting units 141 and 142 on the XY plane are substantially the same. The X-direction dimension sx of the light emitting portions 141 and 142 is the same as each other. The Y-direction dimension sy of the light-emitting portions 141 and 142 is the same. The short sides Lb, Lb on the +Y side of the light emitting portions 141, 142 are at the same positions in the Y direction. The short sides Lb, Lb on the -Y side of the light emitting portions 141, 142 are at the same positions in the Y direction (second direction). The long side La on the +X side of the light emitting portion 141 and the long side La on the −X side of the light emitting portion 142 are separated from each other by a distance dx in the X direction. That is, the light-emitting portions 141 and 142 are arranged apart from each other by the interval dx in the X direction.

The optical axis AX100 passes through the middle between the +X side long side La of the light emitting section 141 and the −X side long side La of the light emitting section 142 in the X direction, and the +Y side of each of the light emitting sections 141 and 142 in the Y direction. It passes through an intermediate position between the short side Lb and the short side Lb on the -Y side. That is, the light emitting units 141 and 142 are arranged symmetrically with respect to the optical axis AX100 on the XY plane.

The beam regions of the blue light beams LB1 and LB2 emitted from the light emitting units 141 and 142 are shown by solid lines in FIG. 3 at the position PS2 shown in FIG. It is reduced with respect to the size of the light emitting units 141 and 142 that are present. The distance in the X direction between the beam areas of the blue light LB1 and LB2 at the position PS2 is shorter than the distance dx shown in FIG. Corresponding to this, the size in the XY plane of each of the diffusion elements 131 and 132 actually arranged at the position PS2 is moderately larger than the beam areas of the blue lights LB1 and LB2 at the position PS2. The distance in the X direction between the +X side end of the diffusing element 131 and the −X side end of the diffusing element 132 at the position PS2 is larger than the distance in the X direction between the beam areas of the blue light beams LB1 and LB2 at the position PS2. reasonably short.

Diffusion elements 131 and 132 indicated by two-dot chain lines in FIG. It represents a virtually projected image, which is appropriately enlarged by the condensing characteristics of the condensing optical system 120 with respect to the diffusion elements 131 and 132 at the position PS2. Each of the diffusion elements 131 and 132 has a long side Lc parallel to the Y direction and a short side Ld parallel to the X direction, and is formed in a rectangular shape that is longer in the Y direction than in the X direction.

The light source device 50 of the first embodiment described above includes a plurality of light emitting units 140 , a condensing optical system 120 and a plurality of diffusion elements 130 . The multiple light emitting units 140 include a light emitting unit 141 that emits blue light LB1 and a light emitting unit 142 that emits blue light LB2. Blue light beams LB<b>1 and LB<b>2 emitted from the light emitting units 141 and 142 are incident on the condensing optical system 120 . The condensing optical system 120 converges the incident blue lights LB1 and LB2 onto the phosphor layer 42 of the rotating phosphor plate 40 while keeping them separated from each other. The plurality of diffusing elements 130 includes a diffusing element 131 for diffusing the blue light LB1 emitted from the condensing optical system 120, and a diffusing element 131 for diffusing the blue light LB2 emitted from the condensing optical system 120 and separated from the blue light LB1. and element 132 .

According to the light source device 50 of the first embodiment, a diffusion plate is provided for each of the plurality of light emitting units 140. That is, the blue light emitted from each of the plurality of light emitting units 140 is diffused by the diffusion elements 130 different for each light. By doing so, the diffusion element 130 can be miniaturized. That is, in the light source device 50 of the first embodiment, the blue light LB1 and the blue light LB1, which are irradiated to the same region by the condensing optical system 120 on the phosphor layer 42 of the rotating fluorescent plate 40, which is the irradiation target of the blue light LB1 and LB2, are irradiated. LB2 is diffused individually by two diffusion elements 130 formed separately from each other, instead of being collectively diffused by one diffusion element as in the conventional art. As a result, the size of each of the diffuser elements 130, which are separate from each other, can be made smaller than the diffuser element that collectively diffuses a plurality of blue lights as described above. Conventionally, for example, when a diffusion element that collectively diffuses a plurality of blue lights is manufactured, there is a risk of a decrease in yield and a decrease in the light diffusion accuracy of the diffusion element. In contrast, according to the light source device 50 of the first embodiment, each of the plurality of diffusing elements 130 is made smaller than in the prior art, so that the manufacturing accuracy of the complicated fine structure for diffusing the blue lights LB1 and LB2 can be increased. It is possible to ensure the entire diffusion surface of the diffusion element 130 and suppress the deterioration of the light diffusion accuracy by each of the plurality of diffusion elements 130 . As a result, it is possible to suppress a decrease in the amount of fluorescence emitted from the phosphor layer 42 irradiated with the blue lights LB1 and LB2, that is, the amount of the yellow light LY, and obtain the amount of white light WL.

The projector 5 of the first embodiment includes the light source device 50 described above, and light modulation devices 400R, 400G, and 400B that form image light by modulating the white light WL emitted from the light source device 50 according to image information. , and a projection optical system 600 for projecting the aforementioned image light. According to the projector 5 of the first embodiment, the amount of white light WL emitted from the light source device 50 can be ensured as described above, and as a result, the brightness of the image displayed on the screen SCR is lowered. can be suppressed.

[Second embodiment]
Next, a second embodiment of the invention will be described with reference to FIG.
In addition, in each of the embodiments after the second embodiment, the same reference numerals as those of the configuration are given to the configurations common to the higher-level embodiments, and the description thereof will be omitted. In each of the embodiments after the second embodiment, the configuration and contents different from those of the higher-level embodiments will be mainly described.
In addition, unless otherwise specified, the configurations of the projectors of the second and subsequent embodiments, other than the light source device, are the same as the configuration of the projector 5 of the first embodiment.

FIG. 4 is a schematic diagram showing the correspondence relationship between the light emitting units 141, 142, 143 and the diffusion elements 131, 132 of the light source device of the second embodiment. As shown in FIG. 4, in the second embodiment, the plurality of light emitting units 140 includes a light emitting unit (third light emitting unit) 143 that emits blue light in addition to the light emitting units 141 and 142 . Although not shown, blue light emitted from the light emitting unit 143 is referred to as blue light (third light) LB3.

The light emitting portion 143 is provided on the surface 113 a of the substrate 113 shared with the light emitting portions 141 and 142 . The light emitting portion 143 has a long side La parallel to the Y direction and a short side Lb parallel to the X direction, and is formed in a rectangular shape that is longer in the Y direction than in the X direction. The shape and size of the light emitting section 143 on the XY plane are substantially the same as those of the light emitting sections 141 and 142 . That is, the size of the light emitting portion 143 in the X direction is the dimension sx. The size of the light emitting portion 143 in the Y direction is the dimension sy.

The light emitting section 143 is arranged on the -Y side of the light emitting sections 141 and 142, overlaps with the light emitting section 141 in the X direction, and is arranged on the -X side of the light emitting section 142. FIG. The −X side long side La of the light emitting portion 143 overlaps the −X side long side La of the light emitting portion 141 in the X direction. The long side La on the +X side of the light emitting section 143 overlaps the long side La on the +X side of the light emitting section 141 in the X direction. In other words, the light emitting units 141 and 143 are aligned with each other in the X direction. The −Y side short side Lb of the light emitting portion 141 and the +Y side short side Lb of the light emitting portion 143 are separated by a distance dy in the Y direction. That is, the light-emitting portions 141 and 142 and the light-emitting portion 143 are spaced apart by the interval dy in the Y direction.

Although not shown, in the light source device of the second embodiment, the blue lights LB1 to LB3 emitted from the light emitting units 141 to 143 are separated from each other and enter the condensing lens 121 of the condensing optical system 120. They converge on a common area of the phosphor layer 42 of the rotating phosphor plate 40 with each other.

The beam area of the blue light LB3 emitted from the light emitting unit 143 at the position PS2 shown in FIG. 2 is as shown in FIG. It is reduced with respect to the size of the light emitting portion 143 indicated by the solid line. The distance in the Y direction between the beam areas of blue light LB1 and LB3 at position PS2 is shorter than the distance dy at position PS1 shown in FIG. 4, and the distance dx at position PS1 is projected onto position PS2. shorter than the time interval.

At the position PS2, the blue light LB1 emitted from the light emitting section 141 and the blue light LB3 emitted from the light emitting section 143 are diffused by the diffusion element 131 common to each other. The size in the XY plane of the diffusing element 131 actually arranged at the position PS2 is moderately larger than the area including the beam areas of the blue lights LB1 and LB3 at the position PS2. That is, the Y-direction dimension of the diffusing element 131 is larger than the sum of the Y-direction dimension of each of the blue lights LB1 and LB3 and the Y-direction distance between the blue lights LB1 and LB3. The Y-direction dimension of diffusion element 132 is the same as the Y-direction dimension of diffusion element 131 .

Since the diffusing element 131 diffuses not only the blue light LB1 emitted from the light emitting unit 141 but also the blue light LB3 emitted from the light emitting unit 143, the diffusing element of the second embodiment indicated by the chain double-dashed line in FIG. The long side Lc of 131 is longer than the long side Lc of the diffusing element 131 of the first embodiment. The size of the diffusing element 132 on the XY plane is the same as that of the diffusing element 131 . The long side Lc of the diffusing element 132 of the second embodiment indicated by a two-dot chain line in FIG. 4 is longer than the long side Lc of the diffusing element 132 of the first embodiment.

As shown in FIG. 4, the optical axis AX100 passes between the +X long side La of each of the light emitting units 141 and 143 in the X direction and the long side La of the −X side of the light emitting unit 142 in the X direction. It passes through an intermediate position between the short side Lb on the -Y side of each of the light emitting portions 141 and 142 and the short side Lb on the +Y side of the light emitting portion 143 .

Like the light source device 50 of the first embodiment, the light source device of the second embodiment described above includes a plurality of light emitting units 140, a condensing optical system 120, and a plurality of diffusion elements 130. FIG. According to the light source device of the second embodiment, each of the plurality of diffusing elements 130 formed separately from each other is made smaller than the conventional one. It is easy to ensure manufacturing accuracy over the entire diffusion surface of the diffusion element 130 , and a decrease in light diffusion accuracy due to each of the plurality of diffusion elements 130 can be suppressed. As a result, a reduction in the amount of yellow light LY emitted from the phosphor layer 42 can be suppressed, and the amount of white light WL can be obtained.

Moreover, in the light source device of the second embodiment, the plurality of light emitting units 140 includes a light emitting unit 143 that emits blue light LB3. The blue light LB3 emitted from the light emitting unit 143 enters the condensing optical system 120 while being separated from each of the blue lights LB1 and LB2 on the XY plane. As shown in FIG. 4 , the distance dy between the light emitting section 143 and the light emitting section 141 or 142 in the Y direction is shorter than the distance dx between the light emitting section 141 and the light emitting section 142 in the X direction. The blue light LB3 emitted from the condensing optical system 120 is diffused by the diffusing element 131. FIG.

According to the light source device of the second embodiment, the blue lights LB1 to LB3 emitted from the three light emitting parts 141 to 143 spaced apart from each other on the XY plane are efficiently diffused by the two diffusion elements 131 and 132. be able to. In the light source device of the second embodiment, since the distance dx between the light emitting portions 141 and 143 and the light emitting portion 142 is longer than the distance dy between the light emitting portions 141 and 143, the two diffusion elements 131 are arranged as shown in FIG. , 132 are spaced apart from each other in the space at position PS2 corresponding to the space between the light emitting units 141, 143 and the light emitting unit 142 at position PS1. That is, the diffusing elements 130 and 130 are spaced apart from each other where the distance between the light emitting sections 140 and 140 adjacent to each other on the XY plane is the longest.

When there are a plurality of light emitting units 140 that are three or more and have the same size, each light emitting unit 140 is associated with one diffusing element 130, that is, the blue light emitted from one light emitting unit is diffused into one diffusing element. If the light is diffused by , the size of the diffusion element increases in the conventional case when the number of light emitting units 140 increases. On the other hand, as the number of light-emitting units 140 increases, the number of support mechanisms (not shown) that support the diffusion element 130 also increases, or the structure of the support mechanism becomes complicated. It becomes difficult to mount the light source device of In other words, there is a so-called trade-off relationship between miniaturization of one diffusing element 130 and the total number of diffusing elements 130 .

In the light source device of the second embodiment, if the size of the diffusing surface of one diffusing element 130 is close to the area where a yield of a predetermined value or more can be secured in the manufacturing apparatus of the diffusing element 130, a plurality of diffusing elements can be obtained. It is preferable that the total number of the plurality of diffusion elements 130 is selected in consideration of suppressing the deterioration of the manufacturing accuracy of the diffusion elements 130 . The total number of diffusing elements 130 is preferably two to four, for example. In this way, by appropriately adjusting the total number of diffusion elements 130 according to the total number of light emitting sections 140 and efficiently diffusing the blue light emitted from each of the plurality of light emitting sections 140 by the plurality of diffusion elements 130, individual diffusion A plurality of diffusing elements 130 can be easily installed while suppressing deterioration in diffusion accuracy of the elements 130 .

In the light source device of the second embodiment, the plurality of diffusing elements 130 formed separately from each other are spaced apart in the space at the position PS2 corresponding to the space where the distance between the plurality of light emitting units 140 is the longest. Also, it is possible to prevent damage or breakage of the plurality of diffusion elements 130 by not allowing the plurality of diffusion elements 130 to come into contact with each other due to vibration generated by the light source device or vibration applied to the light source device from the outside.

As a modification of the second embodiment, the light emitting section 143 may overlap the light emitting section 142 in the X direction instead of the light emitting section 141 and may be arranged on the +X side of the light emitting section 141 . In this case, the ±X side long sides La of the light emitting portion 143 overlap the ±X side long sides La of the light emitting portion 142 in the X direction. In other words, the light emitting units 142 and 143 are aligned with each other in the X direction. According to the light source device of the modified example of the second embodiment, the same effects as those of the above-described light source device of the second embodiment can be obtained.

Further, according to the projector of the second embodiment, by including the above-described light source device, it is possible to ensure the amount of white light WL emitted from the light source device, and to suppress a decrease in the brightness of the image on the screen SCR. can.

[Third embodiment]
Next, a third embodiment of the invention will be described with reference to FIG.
FIG. 5 is a schematic diagram showing the correspondence relationship between the light emitting units 141, 142, 143, 144 and the diffusion elements 131, 132 of the light source device of the third embodiment. The four light emitting units 141 to 144 constitute a first group G1 described in the claims and below. As shown in FIG. 5, in the third embodiment, the plurality of light emitting units 140 includes a light emitting unit 144 that emits blue light in addition to the light emitting units 141 to 143 . Although not shown, blue light emitted from the light emitting unit 144 is referred to as blue light LB4.

The light emitting portion 144 has a long side La parallel to the Y direction and a short side Lb parallel to the X direction, and is formed in a rectangular shape longer in the Y direction than in the X direction. The shape and size of the light emitting section 144 on the XY plane are substantially the same as those of the light emitting sections 141 to 143 . That is, the size of the light emitting portion 144 in the X direction is the dimension sx. The size of the light emitting portion 144 in the Y direction is the dimension sy.

The light emitting unit 144 is arranged on the −Y side of the light emitting units 141 and 142 , overlaps the light emitting unit 142 in the X direction, and is arranged on the +X side of the light emitting unit 143 . The −X side long side La of the light emitting portion 144 overlaps the −X side long side La of the light emitting portion 142 in the X direction. The long side La on the +X side of the light emitting section 144 overlaps the long side La on the +X side of the light emitting section 142 in the X direction. The +Y side short side Lb of the light emitting section 144 overlaps the +Y side short side Lb of the light emitting section 143 in the Y direction. The −Y side short side Lb of the light emitting portion 144 overlaps the −Y side short side Lb of the light emitting portion 144 in the Y direction. In other words, the two light emitting units 142 and 144 are aligned in the X direction, and the two light emitting units 143 and 144 are aligned in the Y direction.

In the third embodiment, the distance dx in the X direction (third direction) between the light emitting units 141 and 143 and the light emitting units 142 and 144 and the Y direction (fourth direction) between the light emitting units 141 and 142 and the light emitting units 143 and 144 ) are equal to each other. That is, in the X direction, two light-emitting portions 141 and 142 and two light-emitting portions 143 and 144 are arranged side by side at an equal interval dx. In the Y direction, two light emitting portions 141 and 143 and two light emitting portions 142 and 144 are arranged side by side at an interval dy equal to the interval dx.

At position PS2 shown in FIG. 2, the beam area of blue light LB4 emitted from light-emitting unit 144 is as shown in FIG. It is reduced with respect to the size of the light emitting portion 144 indicated by the solid line. The distance in the Y direction between the beam areas of the blue light beams LB2 and LB4 at the position PS2 is shorter than the distance dy shown in FIG. are equivalent.

At the position PS2, the blue light LB2 emitted from the light emitting section 142 and the blue light LB4 emitted from the light emitting section 144 are diffused by the diffusion element 132 common to each other. That is, the blue lights LB1 and LB3 emitted from the condensing optical system 120 are diffused by the diffusion element (third diffusion element) 131, and the blue lights LB2 and LB4 emitted from the condensing optical system 120 are diffused by the diffusion element (fourth diffusion element). diffusing element) 132 . The size in the XY plane of the diffusion element 132 actually arranged at the position PS2 is moderately larger than the area including the beam areas of the blue light LB2 and LB4 at the position PS2. In the third embodiment, as in the second embodiment, the dimensions of the diffusing element 132 in the X and Y directions are the same as the dimensions of the diffusing element 131 .

Like the light source device 50 of the first embodiment, the light source device of the third embodiment described above includes a plurality of light emitting units 140, a condensing optical system 120, and a plurality of diffusion elements 130. FIG. According to the light source device of the third embodiment, each of the plurality of diffusing elements 130 formed separately from each other is made smaller than before, suppressing a decrease in the light amount of the yellow light LY emitted from the phosphor layer 42, and producing a white light. The amount of light WL can be obtained.

Further, in the light source device of the third embodiment, the plurality of light emitting units 140 includes a first group G1 in which two light emitting units 140 are arranged side by side at equal intervals in each of the X direction and the Y direction. The plurality of diffusing elements 130 includes diffusing elements 131 corresponding to the light emitting units 141 and 143 of the first group G1 and diffusing elements 132 corresponding to the light emitting units 142 and 144 of the first group G1. The diffusing elements 131 and 132 are arranged side by side in the X direction and spaced from each other with respect to the first group G1.

According to the light source device of the third embodiment, the blue lights LB1 to LB4 emitted from the four light emitting units 141 to 144 spaced apart from each other on the XY plane are efficiently diffused by the two diffusion elements 131 and 132. be able to. In the light source device of the third embodiment, assuming a square connecting the corners closest to the optical axis AX100 on the XY plane of each of the four light emitting units 141 to 144 as indicated by the dashed line in FIG. The length of the diagonal line is longer than any of the intervals dx and dy. An optical axis AX100 passes through the intersection of the diagonal lines. Diffusion elements 131 and 132 are arranged in a state of being spaced apart on a virtual diagonal line in which the aforementioned diagonal line at position PS1 is projected at position PS2. In the light source device of the third embodiment, the total number of the plurality of diffusion elements 130 and the dimensions of each diffusion element 130 can be preferably set based on the above-described trade-off relationship as in the second embodiment. It is possible to easily install a plurality of diffusion elements 130 while suppressing a decrease in diffusion accuracy of the elements 130 and prevent damage or breakage of the plurality of diffusion elements 130 .

In the third embodiment, the diffusion element 131 corresponds to the light emitters 141 and 143 and the diffusion element 132 corresponds to the light emitters 142 and 144 . However, since the intervals dx and dy are equal to each other, as a modified example of the third embodiment, as shown by the dashed lines in FIG. 143 and 144. That is, the diffusing elements 131 and 132 may be spaced apart from each other in the space at the position PS2 corresponding to the space between the light emitting units 141 and 142 and the light emitting units 143 and 144 in the Y direction at the position PS1. In that case, the blue lights LB1 and LB2 emitted from the condensing optical system 120 are diffused by a diffusing element (third diffusing element) 131, and the blue lights LB3 and LB4 emitted from the condensing optical system 120 are diffused by the diffusing element (third 4 diffusion element) 132 . According to the light source device of the modified example of the third embodiment, the same effects as those of the light source device of the above-described third embodiment can be obtained.

In the third embodiment, the two light emitting units 140 are arranged in the X direction and the Y direction in the first group G1 at equal intervals. The number of light emitting units 140 arranged at equal intervals in the direction may be three or more. When three or more light emitting units 140 are arranged at equal intervals in at least one of the X direction and the Y direction in the first group G1, the space between the light emitting units 140 adjacent to each other in at least one direction is Two or more are formed. As described in the second embodiment, the number of diffusing elements 130 arranged in at least one of the X direction and the Y direction in the first group G1 is determined by the trade-off relationship described above and the diffusion of one diffusing element 130. Considering that the size of the surface is close to the area that can ensure the yield at the time of manufacturing, it is preferable that the number is set at least equal to or less than the number of light emitting units 140 in one direction. When two or more diffusing elements 130 are arranged, the diffusing elements 130, 130 adjacent to each other in at least one of the X direction and the Y direction in the first group G1 are located at two or more positions PS1. It is preferable that the blue light emitted from each of the light emitting units 140, 140 is spaced apart from each other in an appropriate space among the spaces between the beam areas at the position PS2 of the blue light.

Further, according to the projector of the third embodiment, by including the above-described light source device, it is possible to ensure the amount of white light WL emitted from the light source device, and to suppress a decrease in the brightness of the image on the screen SCR. can.

[Fourth Embodiment]
Next, a fourth embodiment of the invention will be described with reference to FIG.
The light source device of the fourth embodiment includes a plurality of substrates 118, for example four substrates 113, 114, 115, and . FIG. 6 is a schematic diagram showing the correspondence relationship between the light emitting units 141 to 144, the plurality of diffusion elements 131 and 132, and the plurality of substrates 113 to 116 of the light source device of the fourth embodiment. As shown in FIG. 6, in the fourth embodiment, as in the third embodiment, four light emitting units 141 to 144 are arranged side by side two by two on the XY plane. The two light-emitting portions 141 and 143 and the two light-emitting portions 142 and 144 are arranged aligned with each other in the X direction. The two light-emitting portions 141 and 142 and the two light-emitting portions 143 and 144 are arranged aligned with each other in the Y direction.

However, in the fourth embodiment, the multiple light emitting units 140 are formed on multiple substrates 118 . It should be noted that in FIG. 6 and related schematic diagrams, the substrate 118 is shown in solid lines, given that the substrate 118 is located closer to the position PS1 than the diffusing element 130 in the Z direction. As shown, it is actually arranged slightly on the -Z side of the light emitting section 140 .

As shown in FIG. 6, in the light source device of the fourth embodiment, each of the light emitting portions 141-144 is formed on each of the substrates 113-116. Each of substrates 113 to 116 is formed in a rectangular shape that is longer in the X direction than in the Y direction. The two substrates 113 and 115 and the two substrates 114 and 116 are respectively aligned with each other in the X direction. The two substrates 113 and 114 and the two substrates 115 and 116 are aligned with each other in the Y direction. The distance between the substrates 113 and 115 and the substrates 114 and 116 in the X direction is substantially the same as the distance between the substrates 113 and 114 and the substrates 115 and 116 in the Y direction.

The light emitting portion 141 is arranged at the substantially center in the X direction of the surface 113a on the +Z side of the substrate 113 and at the end on the -Y side in the Y direction. The light emitting part 142 is arranged at the substantially center in the X direction of the +Z side surface 114a of the substrate 114 and at the end on the -Y side in the Y direction. The light emitting unit 143 is arranged at the substantially center in the X direction of the surface 115a on the +Z side of the substrate 115 and at the end on the +Y side in the Y direction. The light emitting unit 144 is arranged at the substantially center in the X direction of the surface 116a on the +Z side of the substrate 116 and at the end on the +Y side in the Y direction. The distance dx in the X direction between the light emitting portions 141 and 143 and the light emitting portions 142 and 144 is wider than the distance dy in the Y direction between the light emitting portions 141 and 142 and the light emitting portions 143 and 144 .

Diffusion element 131 corresponds to light emitting units 141 and 143 , and diffusion element 132 corresponds to light emitting units 142 and 144 . That is, the blue lights LB1 and LB3 emitted from the condensing optical system 120 are diffused by the diffusing element 131, and the blue lights LB2 and LB4 emitted from the condensing optical system 120 are diffused by the diffusing element 132. The size in the XY plane of the diffusing element 131 actually arranged at the position PS2 is moderately larger than the area including the beam areas of the blue lights LB1 and LB3 at the position PS2. The size of the diffusing element 132 actually placed at the position PS2 in the XY plane is the same as that of the diffusing element 131, and is moderately larger than the area including the beam areas of the blue lights LB2 and LB4 at the position PS2.

The light source device of the fourth embodiment described above includes a plurality of light emitting units 140, a condensing optical system 120, and a plurality of diffusion elements 130, like the light source device 50 of the first embodiment. According to the light source device of the fourth embodiment, each of the plurality of diffusing elements 130 formed separately from each other is made smaller than before, suppressing a decrease in the light amount of the yellow light LY emitted from the phosphor layer 42, and producing a white light. The amount of light WL can be obtained.

Further, according to the light source device of the fourth embodiment, the blue light beams LB1 to LB4 emitted from the four light emitting portions 141 to 144 spaced apart from each other on the XY plane are efficiently diffused by the two diffusion elements 131 and 132. can spread.

Moreover, the light source device of the fourth embodiment includes a plurality of substrates 118 on which a plurality of light emitting units 140 are formed. In the light source device of the fourth embodiment, in each of the substrates 113 to 116 included in the plurality of substrates 118, each of the light emitting portions 141 to 144 is close to each of the substrates 115, 116, 113, 114 adjacent in the Y direction. side (another substrate side). That is, the light-emitting portions 141 and 142 are arranged on the −Y side of the substrates 113 and 114 on which the light-emitting portions 141 and 142 are formed, which are close to the substrates 115 and 116 adjacent in the Y direction. The light emitting portions 143 and 144 are arranged on the +Y side of the substrates 115 and 116 on which the light emitting portions 143 and 144 are formed, which are close to the substrates 113 and 114 adjacent in the Y direction. In the light source device of the fourth embodiment, the blue lights LB1 and LB3 emitted from the two light emitting units 141 and 143 arranged on the substrates 113 and 115 adjacent to each other in the Y direction are diffused by the same diffusion element 131. be diffused. Similarly, the blue lights LB2 and LB4 emitted from the two light emitting units 142 and 144 arranged on the substrates 114 and 116 that are adjacent to each other in the Y direction are diffused by the same diffusion element 132 as each other.

Further, according to the light source device of the fourth embodiment, since the four light emitting units 141 to 144 are arranged on the four substrates 113 to 116 as described above, they are arranged at intervals dy on the XY plane. Each of the two sets of light-emitting portions 141, 143 and light-emitting portions 142, 144 can correspond to each of the diffusing elements 131 and 132. FIG. Accordingly, when each of the diffusion element 131 and the diffusion element 132 is made to correspond to each of the two sets of the light emitting units 141 and 142 and the light emitting units 143 and 144 which are arranged at the interval dy wider than the interval dx in the XY plane, By comparison, each of the diffusion elements 131 and 132 can be miniaturized, and a decrease in the diffusion accuracy of each of the diffusion elements 131 and 132 can be suppressed. Further, according to the light source device of the fourth embodiment, expansion in the Y direction of the blue light composed of the blue lights LB1 and LB3 emitted from the light emitting units 141 and 143 can be suppressed. Similarly, expansion in the Y direction of the blue light composed of the blue lights LB2 and LB4 emitted from the light emitting units 142 and 144 can be suppressed.

In the fourth embodiment, one light emitting unit 140 is formed on one substrate 118, but the number of light emitting units 140 formed on one substrate 118 may be two or more. Not limited to a specific number. As a modification of the fourth embodiment, the plurality of light emitting units 140 may further include light emitting units 145 and 146 as shown in FIG. 7, for example. Two light emitting units 141 and 145 may be formed on the surface 113 a of the substrate 113 and two light emitting units 143 and 146 may be formed on the surface 115 a of the substrate 115 . The light emitting unit 145 is arranged on the +X side of the light emitting unit 141 with a gap therebetween in the X direction. The light emitting units 141 and 145 are arranged on the −X side and the +X side with respect to the approximate center of the substrate 113 in the X direction. The light-emitting portion 145 is aligned with the light-emitting portion 141 in the Y direction. The light emitting unit 146 is arranged on the +X side of the light emitting unit 142 with a gap therebetween in the X direction. The light emitting units 143 and 146 are arranged on the -X side and the +X side with respect to the approximate center of the substrate 115 in the X direction. The light-emitting portion 146 is aligned with the light-emitting portion 142 in the Y direction. In addition, the light emitting section 146 is aligned with the light emitting section 145 in the X direction.

In the light source device of the modification of the fourth embodiment, the plurality of diffusion elements 130 may further include a diffusion element 133 , and the common diffusion element 133 may correspond to the light emitting units 145 and 146 . That is, at the position PS2, the blue light emitted from each of the light emitting units 145 and 146 is diffused by the same diffusion element 133 as each other. At position PS2, the size of diffusing element 133 in the XY plane is the same as the size of diffusing elements 131 and 132 . In the X direction, the light emitting units 145 and 146 are arranged much closer to the light emitting units 141 and 143 than the light emitting units 142 and 144. One diffusing element 130 may be associated with each. In that case, the blue light emitted from each of the light emitting units 141 , 143 , 145 and 146 is diffused by the same diffusion element 130 . According to the light source device of the modified example of the fourth embodiment, the same effects as those of the light source device of the above-described fourth embodiment can be obtained.

Further, according to the projector of the fourth embodiment, by including the above-described light source device, it is possible to secure the amount of white light WL emitted from the light source device and suppress the reduction in the brightness of the image on the screen SCR. can.

[Fifth embodiment]
Next, a fifth embodiment of the invention will be described with reference to FIG.
The light source device of the fifth embodiment includes twelve light emitting portions 141 to 152 as the plurality of light emitting portions 140, and six substrates 113 to 117 and 119 on which the light emitting portions 141 to 152 are formed. The light source device of the fifth embodiment includes two diffusing elements 131 and 132 as the plurality of diffusing elements 130 . FIG. 8 is a schematic diagram showing the correspondence relationship between the light emitting units 141 to 152, the plurality of diffusion elements 131 and 132, and the plurality of substrates 113 to 117 and 119 of the light source device of the fifth embodiment.

As shown in FIG. 8, each of substrates 117 and 119 is formed in a rectangular shape longer in the X direction than in the Y direction, and has the same shape and size as each of substrates 113-116. The three substrates 113, 114, 117 and the three substrates 115, 116, 119 are aligned with each other in the Y direction. The two substrates 117 and 119 are aligned with each other in the X direction. Among the substrates 113, 114, and 117, the distances between substrates adjacent in the X direction are substantially the same. Adjacent substrates in the X direction among the substrates 115, 116, and 119 have substantially the same spacing. The distance between the substrates 113 and 115, the distance between the substrates 114 and 116, and the distance between the substrates 117 and 119 that are adjacent to each other in the Y direction are substantially the same.

In the light source device of the fifth embodiment, the light emitting section 141 is arranged at the end of the surface 113a of the substrate 113 slightly on the +X side and the -Y side from the center in the X direction. The light-emitting portion 142 is arranged on the +X side of the surface 113a of the substrate 113 relative to the light-emitting portion 141, and is arranged at the +X side end and the −Y side end of the surface 113a. The light emitting portion 143 is arranged at the −X side end and the −Y side end of the surface 114 a of the substrate 114 . The light emitting portion 144 is arranged at the +X side end and the −Y side end of the surface 114a of the substrate 114 . The light emitting portion 145 is arranged at the −X side end and the −Y side end of the +Z side surface 117a of the substrate 117 . The light-emitting portion 146 is arranged on the surface 117a of the substrate 117 on the +X side of the light-emitting portion 145, and is arranged on the edge of the surface 117a slightly on the -X side and on the -Y side from the center in the X direction. The light emitting portions 141 to 146 are aligned in the Y direction.

The light emitting portions 147 to 152 are formed in a rectangular shape longer in the Y direction than in the X direction, and have the same shape and size as the light emitting portions 141 to 146 described above. The light emitting portions 147 and 148 are arranged so as to be aligned in the X direction with the light emitting portions 141 and 142 formed on the substrate 113 adjacent to the substrate 115 in the Y direction on the surface 115a of the substrate 115. are placed in The light emitting portions 149 and 150 are arranged so as to be aligned in the X direction with the light emitting portions 143 and 144 formed on the substrate 114 adjacent to the substrate 116 in the Y direction on the surface 116a of the substrate 116. are placed in The light emitting portions 151 and 152 are arranged so as to be aligned in the X direction with the light emitting portions 145 and 146 formed on the substrate 117 adjacent to the substrate 119 in the Y direction on the surface 119a on the +Z side of the substrate 119, and on the +Y side of the surface 119a. located at the end of the The light emitting portions 147 to 152 are aligned in the Y direction.

As in the light source devices of the above-described embodiments, the distance in the X direction between the light emitting units 140 is arranged on the +X side of the long side La or the short side Lb on the +X side of the light emitting unit 140 arranged on the -X side. represents the distance in the X direction from the long side La or the short side Lb on the -X side of the light-emitting portion 140 . The distance in the Y direction between the light emitting units 140 is the short side Lb or the long side La of the light emitting unit 140 on the +Y side on the +Y side. It represents the distance in the Y direction from the side Lb or the long side La. The light emitting portions 141 and 147 and the light emitting portions 142 and 148 are separated by a distance dx1 in the X direction. The light-emitting portions 142 and 148 and the light-emitting portions 143 and 149 are separated by a distance dx2 in the X direction. The light-emitting portions 143 and 149 and the light-emitting portions 144 and 150 are separated by an interval dx3 in the X direction. The light-emitting portions 144 and 150 and the light-emitting portions 145 and 151 are separated by an interval dx2 in the X direction. The light-emitting portions 145 and 151 and the light-emitting portions 146 and 152 are separated by an interval dx1 in the X direction. The interval dx2 is longer than the interval dx1. The interval dx3 is even longer than the interval dx2. The distance dy in the Y direction between each of the light emitting portions 141 to 146 and each of the light emitting portions 147 to 152 is equal to each other. The interval dy is shorter than the interval dx1.

The diffusion element 131 corresponds to the light emitting portions 141-143 and the light emitting portions 147-149. Diffusion element 132 corresponds to light emitters 144-146 and light emitters 150-152. That is, the blue light emitted from each of the light emitting units 141 to 143 and the light emitting units 147 to 149 through the common condensing optical system 120 is diffused by the diffusion element 131 at the position PS2. Blue light emitted from each of the light emitting units 144 to 146 and the light emitting units 150 to 152 through the common condensing optical system 120 is diffused by the diffusion element 132 at the position PS2.

The size of the diffusing element 131 actually arranged at the position PS2 in the XY plane defines the beam area of the blue light that reaches the position PS2 after being emitted from each of the light emitting units 141 to 143 and the light emitting units 147 to 149. Moderately larger than the containing area. The size of the diffusion element 132 actually arranged at the position PS2 in the XY plane is the same as that of the diffusion element 131, and the light emitted from each of the light emitting units 144 to 146 and the light emitting units 150 to 152 is at the position PS2. Moderately larger than the area containing the beam area of blue light to be reached. Each of diffusion elements 131 and 132 is formed in a rectangular shape that is longer in the X direction than in the Y direction.

The optical axis AX100 passes through an intermediate position between the light emitting units 143, 144 and 149, 150 in the X direction, and an intermediate position between the light emitting units 143, 149 and 144, 150 in the Y direction. That is, the optical axis AX100 passes through intermediate positions of the diffusing elements 131 and 132 in the X and Y directions.

The light source device of the fifth embodiment described above includes a plurality of light emitting units 140, a condensing optical system 120, and a plurality of diffusion elements 130, like the light source device 50 of the first embodiment. According to the light source device of the fifth embodiment, each of the plurality of diffusing elements 130 formed separately from each other is made smaller than before, suppressing a decrease in the light amount of the yellow light LY emitted from the phosphor layer 42, and producing a white light. The amount of light WL can be obtained.

Further, according to the light source device of the fifth embodiment, the blue light emitted from the twelve light emitting units 141 to 152 arranged apart from each other on the XY plane is efficiently diffused by the two diffusion elements 131 and 132. be able to.

Further, in the light source device of the fifth embodiment, the diffusion elements 131 and 132 are arranged at a distance dx3, which is the longest distance between the light emitting portions 140 adjacent to each other on the XY plane among the light emitting portions 141 to 152. 143, 149 and light emitting portions 144, 150 are spaced apart from each other. Diffusion elements 131 and 132 have the same size as each other. In the light source device of the fifth embodiment, the diffusing element is placed in the space at the position PS2 corresponding to the space between the light emitting parts 143, 149 and the light emitting parts 144, 150 where the distance between the plurality of light emitting parts 140 is longest at the position PS1. 131 and 132 are spaced apart from each other. Also, the six light emitting units 141 to 146 share one diffusion element 131, and the six light emitting units 147 to 152 share one diffusion element 132. FIG. For these reasons, according to the light source device of the fifth embodiment, the diffusion elements 131 and 132 are efficiently miniaturized, the number of the diffusion elements 130 is reduced, and the diffusion elements 131 and 132 are arranged. can be made easier. Moreover, according to the light source device of the fifth embodiment, since the diffusion elements 131 and 132 having the same size are used, it is possible to prepare the diffusion elements 131 and 132 with one type of manufacturing process and conditions, thereby reducing costs. can be achieved.

In the light source device of the fifth embodiment, similarly to the fourth embodiment, in each of the substrates 113 to 117 and 119, the light emitting portions 141 to 152 are arranged on the substrates 115, 116, 113, 114, 119, 117 (another substrate side). According to the light source device of the fifth embodiment, three sets of light-emitting units 141 and 147, light-emitting units 142 and 148, and light-emitting units 143 and 149 are arranged at an interval dy shorter than the intervals dx1, dx2, and dx3 on the XY plane. and diffusion elements 132 corresponding to the three sets of light emitting units 144 and 150, light emitting units 145 and 151, and light emitting units 145 and 152, respectively. It is possible to suppress the deterioration of the diffusion accuracy of Further, according to the light source device of the fifth embodiment, it is possible to suppress expansion of the blue light emitted from each of the light emitting portions 141 to 143 and 147 to 149 in the Y direction. Similarly, it is possible to suppress expansion of the blue light emitted from each of the light emitting portions 144 to 146 and 150 to 152 in the Y direction.

In the fifth embodiment, four light emitting units 140 are formed on one substrate 118, but the number of light emitting units 140 formed on one substrate 118 may be three or less. It may be five or more, and is not limited to a specific number. Even when the number of substrates 118 and the number of light emitting units 140 are appropriately changed, as described above, the plurality of diffusion elements 130 are the light emitting units 140 adjacent to each other on the XY plane. Preferably, they are spaced apart from each other with the longest distance between them. Based on this policy, if the distance dx3 is the widest, then the distances dx1 and dx2, for example, may be equal to each other.

Further, according to the projector of the fifth embodiment, by including the above-described light source device, it is possible to secure the amount of white light WL emitted from the light source device and suppress the reduction in the brightness of the image on the screen SCR. can.

[Sixth Embodiment]
Next, a sixth embodiment of the invention will be described with reference to FIG.
The light source device of the sixth embodiment includes ten light emitting portions 141 to 145 and 147 to 151 as the plurality of light emitting portions 140, six substrates 113 to 117 and 119, and two diffusion elements as the plurality of diffusion elements 130. 131, 132. FIG. 9 is a schematic diagram showing the correspondence relationship between the light emitting parts 141 to 145 and 147 to 151, the plurality of diffusion elements 131 and 132, and the plurality of substrates 113 to 117 and 119 of the light source device of the sixth embodiment.

As shown in FIG. 9, the light source device of the sixth embodiment has the same configuration as the light source device of the fifth embodiment, except that the light emitting units 146 and 152 are not provided. However, the diffusion element 132 included in the light source device of the sixth embodiment corresponds to the four light emitting units 144, 145, 150, 151, and the six light emitting units 144 to 146, 150 to 144, 146, 150, . 152 is smaller than the diffusing element 132 . That is, blue light emitted from each of the light emitting units 144, 145, 150, and 151 at the position PS1 through the common condensing optical system 120 is diffused by the diffusion element 132 at the position PS2. The size of the diffusing element 132 in the XY plane is smaller than that of the diffusing element 131 . The diffusion element 132 is formed in a rectangular shape that is longer in the Y direction than in the X direction.

According to the light source device of the sixth embodiment described above, similarly to the light source device of the fifth embodiment, the blue light emitted from each of the plurality of light emitting units 140 spaced apart from each other on the XY plane is emitted from each other. Efficient diffusion can be achieved by two separately formed diffusion elements 131 and 132 .

In addition, in the light source device of the sixth embodiment, the beam region including the beam region of the blue light at the position PS2 emitted from each of the four light emitting units 144, 145, 150, and 151 through the common condensing optical system 120 is diffused. The area of interest is smaller than the area containing the beam area of blue light at position PS2 emitted from each of the six light emitters 141-143, 147-149 through the common condensing optical system 120. FIG. Therefore, the diffusing surface required for the diffusing element 132 is smaller than the diffusing surface required for the diffusing element 131 . According to the light source device of the sixth embodiment, among the plurality of diffusion elements 130 , the diffusion element 132 having a smaller number of corresponding light emitting units can be made smaller than the diffusion element (the other diffusion element) 131 . As a result, the diffusion accuracy of the diffusion element 132 can be further enhanced.

Further, according to the projector of the sixth embodiment, by including the above-described light source device, it is possible to secure the amount of white light WL emitted from the light source device and suppress the reduction in the brightness of the image on the screen SCR. can.

[Seventh Embodiment]
Next, a seventh embodiment of the invention will be described with reference to FIG.
The light source device of the seventh embodiment includes five light emitting portions 141 to 143, 147, and 148 as the plurality of light emitting portions 140, three substrates 113 to 115 as the plurality of substrates 118, and two diffusion elements 130. Diffusion elements 131, 132 are provided. FIG. 10 is a schematic diagram showing the correspondence relationship between the light emitting units 141 to 143, 147 and 148, the plurality of diffusion elements 131 and 132, and the plurality of substrates 113 to 115 of the light source device of the seventh embodiment.

As shown in FIG. 10, the light emitting units 142 and 148 of the light source device of the seventh embodiment are arranged on the +X side of the light emitting units 142 and 148 of the light source devices of the fifth and sixth embodiments. . The light emitting section 143 of the light source device of the seventh embodiment is arranged on the -X side of the light emitting section 143 of each of the light source devices of the fifth and sixth embodiments. Therefore, in the seventh embodiment, the distance dx1 in the X direction between the light emitters 141 and 147 and the light emitters 142 and 148 is longer than the distance dx2 in the X direction between the light emitters 142 and 148 and the light emitter 143 . A distance dy between the light emitting portions 141 to 143 and the light emitting portions 147 and 148 in the Y direction is at least shorter than the distance dx1 and equal to the distance dx2.

The diffusing element 131 corresponds to the two light emitting parts 141 and 147 . Diffusion element 132 corresponds to three light emitting portions 142 , 143 , 148 . That is, the blue light emitted from each of the light emitting units 141 and 147 through the common condensing optical system 120 is diffused by the diffusion element 131 at the position PS2. Blue light emitted from each of the light emitting units 142, 143, and 148 through the common condensing optical system 120 is diffused by the diffusion element 132 at the position PS2.

The size of the diffusing element 131 actually arranged at the position PS2 in the XY plane is moderately larger than the area including the beam area of the blue light that reaches the position PS2 after being emitted from each of the light emitting units 141 and 147. big. The size of the diffusing element 132 actually arranged at the position PS2 in the XY plane is larger than that of the diffusing element 131, and the amount of blue light reaching the position PS2 after being emitted from each of the light emitting units 142, 143, and 148 is Moderately larger than the area containing the beam area. Each of diffusion elements 131 and 132 is formed in a rectangular shape that is longer in the Y direction than in the X direction.

The optical axis AX100 passes through intermediate positions between the light emitting units 141, 147 and 143 in the X direction and intermediate positions between the light emitting units 141 to 143 and the light emitting units 147 and 148 in the Y direction.

According to the light source device of the seventh embodiment described above, similarly to the light source device of the sixth embodiment, each of the five light emitting units 141 to 143, 147, and 148 arranged apart from each other on the XY plane The emitted blue light can be efficiently diffused by two diffusion elements 131 and 132 formed separately from each other.

Further, in the light source device of the seventh embodiment, the diffusion elements 131 and 132 are arranged at a distance dx1, which is the longest distance between the light emitting portions 140 adjacent to each other on the XY plane among the light emitting portions 141 to 143, 147, and 148. The light emitting portions 141 and 147 and the light emitting portions 142 and 148 are spaced apart from each other. According to the light source device of the seventh embodiment, while efficiently miniaturizing each of the diffusion elements 131 and 132, the number of the diffusion elements 130 is reduced, and the distance between the diffusion elements 131 and 132 is secured. The diffusing elements 131, 132 can be easily arranged.

In the light source device of the seventh embodiment, the light emitting units 141 to 143 are arranged on the side closer to the substrate 115 adjacent to each other in the Y direction (another substrate side), that is, on the −Y side in the Y direction. The light emitting units 147 and 148 are arranged on the side closer to the substrates 113 and 114 adjacent in the Y direction (another substrate side), that is, on the +Y side in the Y direction. According to the light source device of the seventh embodiment, it is possible to suppress the enlargement of each of the diffusion elements 131 and 132 in the Y direction and to suppress the deterioration of the diffusion accuracy of each of the diffusion elements 131 and 132 . Further, according to the light source device of the seventh embodiment, expansion in the Y direction of the blue light emitted from each of the light emitting units 141 to 143, 147, and 148 can be suppressed.

Furthermore, in the light source device of the seventh embodiment, the diffusion target area including the beam area of the blue light at the position PS2 emitted from each of the two light emitting units 141 and 147 via the common condensing optical system 120 is , is smaller than the area including the beam area of the blue light at the position PS2 emitted from each of the three light emitting units 142, 143, and 148 via the common condensing optical system 120. FIG. Therefore, the diffusing surface required for the diffusing element 131 is smaller than the diffusing surface required for the diffusing element 132 . According to the light source device of the seventh embodiment, among the plurality of diffusion elements 130, the diffusion element 131 having a smaller number of corresponding light emitting portions can be made smaller than the diffusion element (the other diffusion element) 132. FIG. As a result, the diffusion accuracy of the diffusion element 131 can be further enhanced.

Further, according to the projector of the seventh embodiment, by providing the above-described light source device, it is possible to secure the amount of white light WL emitted from the light source device and suppress the decrease in the brightness of the image on the screen SCR. can.

[Eighth Embodiment]
Next, an eighth embodiment of the invention will be described with reference to FIG.
The light source device of the seventh embodiment includes eight light emitting portions 141 to 144 and 147 to 150 as the plurality of light emitting portions 140, four substrates 113 to 116 as the plurality of substrates 118, and three diffusion elements 130. Diffusion elements 131 , 132 , 133 are provided. FIG. 11 is a schematic diagram showing the correspondence relationship between the light emitting units 141 to 144 and 147 to 150, the plurality of diffusion elements 131 to 133, and the plurality of substrates 113 to 116 of the light source device of the eighth embodiment.

As shown in FIG. 10, the light source device of the eighth embodiment includes light emitting units 144, 149 and 150 and a substrate 116 on which the light emitting units 149 and 150 are formed, in addition to the configuration of the light source device of the seventh embodiment. , and a diffusing element 133 .

The light emitting part 144 of the light source device of the eighth embodiment is arranged near the center of the surface 114a of the substrate 114 in the X direction, and aligned with the light emitting part 143 in the Y direction. The light emitting units 149 and 150 are arranged on the surface 116a of the substrate 116 in alignment with the light emitting units 143 and 144 in the X direction, and aligned with the light emitting units 147 and 148 in the Y direction. The distance dx1 in the X direction between the light emitting portions 143 and 149 and the light emitting portions 144 and 150 is equal to the distance dx1 in the X direction between the light emitting portions 141 and 147 and the light emitting portions 142 and 148, and is longer than the distance dx2. A distance dy in the Y direction between the light emitting portions 141 to 144 and the light emitting portions 147 to 150 is shorter than the distance dx1 and longer than the distance dx2.

The diffusion element 131 corresponds to the two light emitting parts 141 and 147 as in the seventh embodiment. Diffusion element 132 corresponds to four light emitting portions 142 , 143 , 148 , 149 . The diffusing element 133 corresponds to the two light emitters 144 and 150 . That is, the blue light emitted from each of the light emitting units 142, 143, 148, and 149 via the common condensing optical system 120 is diffused by the diffusion element 132 at the position PS2. Blue light emitted from each of the light emitting units 144 and 150 through the common condensing optical system 120 is diffused by the diffusion element 133 at the position PS2.

The size of the diffusing element 133 actually arranged at the position PS2 in the XY plane is moderately larger than the area including the beam area of the blue light that reaches the position PS2 after being emitted from each of the light emitting units 144 and 150. big. Each of diffusion elements 131 to 133 is formed in a rectangular shape that is longer in the Y direction than in the X direction. The size of the diffusing element 133 in the XY plane is the same as that of the diffusing element 131 and smaller than that of the diffusing element 132 .

The optical axis AX100 passes through intermediate positions between the light emitting units 142, 148 and 143, 149 in the X direction and intermediate positions between the light emitting units 141 to 144 and 147 to 150 in the Y direction.

According to the light source device of the eighth embodiment described above, the blue light emitted from each of the eight light emitting units 141 to 144 and 147 to 150 arranged apart from each other on the XY plane is formed separately from each other. Efficient diffusion can be achieved by the three diffusion elements 131-133.

Further, in the light source device of the eighth embodiment, the diffusion elements 131 and 132 and the diffusion elements 132 and 133 are the light emission sections 140 adjacent to each other on the XY plane among the light emission sections 141 to 144 and 147 to 150. The light emitting units 141 and 147 and the light emitting units 142 and 148, which are arranged at the longest interval dx1, and the light emitting units 143 and 149 and the light emitting units 144 and 150 are spaced apart from each other. According to the light source device of the eighth embodiment, each of the diffusion elements 131 to 133 is efficiently miniaturized, the number of diffusion elements 130 is reduced, and diffusion elements 131 and 132 and diffusion elements 132 and 133 are reduced. , the diffusing elements 131 to 133 can be easily arranged while securing the intervals of .

In the light source device of the eighth embodiment, the light emitting units 141 to 144 are arranged on the side closer to the substrates 115 and 116 adjacent in the Y direction (another substrate side), that is, on the -Y side in the Y direction. The light emitting units 147 to 150 are arranged on the side closer to the substrates 113 and 114 adjacent in the Y direction (another substrate side), that is, on the +Y side in the Y direction. According to the light source device of the eighth embodiment, it is possible to suppress an increase in size in the Y direction of each of the diffusion elements 131 to 133 and to suppress a decrease in diffusion accuracy of each of the diffusion elements 131 to 133 . Further, according to the light source device of the eighth embodiment, it is possible to suppress the expansion of the blue light emitted from each of the light emitting units 141 to 144 and 147 to 150 in the Y direction.

Furthermore, in the light source device of the eighth embodiment, the diffusion target area including the blue light beam area at the position PS2 emitted from each of the two light emitting units 144 and 150 via the common condensing optical system 120 is , is smaller than the area including the beam area of the blue light at the position PS2 emitted from each of the four light emitting units 142, 143, 148, and 149 through the common condensing optical system 120. FIG. According to the light source device of the seventh embodiment, among the plurality of diffusion elements 130, the diffusion elements 131 and 133 corresponding to a smaller number of light emitting units can be made smaller than the diffusion element (the other diffusion element) 132. . As a result, the diffusion accuracy of the diffusion elements 131 and 133 can be further enhanced.

Further, according to the projector of the eighth embodiment, by including the above-described light source device, it is possible to secure the amount of white light WL emitted from the light source device and suppress the reduction in the brightness of the image on the screen SCR. can.

[Ninth Embodiment]
Next, a ninth embodiment of the invention will be described with reference to FIG.
The light source device of the ninth embodiment includes three light emitting portions 141 to 143 as the plurality of light emitting portions 140, three substrates 113 to 115 as the plurality of substrates 118, two diffusion elements 131 as the plurality of diffusion elements 130, 132. FIG. 12 is a schematic diagram showing the correspondence relationship between the light emitting units 141 to 143, the plurality of diffusion elements 131 and 132, and the plurality of substrates 113 to 115 of the light source device of the ninth embodiment.

As shown in FIG. 12, in the light source device of the ninth embodiment, the substrate 114 is arranged on the +X side of the substrates 113 and 115 in the same manner as in the light source devices of the higher-level embodiments. 115 is placed in the middle. That is, the center of the substrate 114 is offset from the center of the substrate 113 and the center of the substrate 115 in the Y direction, and is approximately midway between the center of the substrate 113 and the center of the substrate 115 .

The light emitting portion (first light emitting portion) 141 is arranged at the center of the surface 113a of the substrate 113 in the X direction and the Y direction. The light emitting portion (second light emitting portion) 142 is arranged at the center of the surface 114a of the substrate 114 in the X direction and the Y direction. The light-emitting portion (third light-emitting portion, fourth light-emitting portion) 143 is arranged at the center of the surface 115a of the substrate 115 in the X direction and the Y direction. Each of the light emitting portions 141 to 143 has a long side (first long side) La and a short side (first short side) Lb, and have the same size. However, in the ninth embodiment, the long side La is parallel to the X direction, and the short side Lb is parallel to the Y direction. That is, each of the light emitting portions 141 to 143 is formed in a rectangular shape that is longer in the X direction than in the Y direction, similarly to each of the substrates 113 to 115 .

Due to the shape and arrangement of the light emitting portions 141 to 143 described above, the light emitting portions 141 and 143 are aligned in the X direction. The light-emitting portion 142 is arranged on the +X side of the light-emitting portions 141 and 143 in the X direction, is arranged with a shift from both the light-emitting portions 141 and 143 in the Y-direction, and is aligned with the light-emitting portions 141 and 143 in the Y-direction. is placed in the middle of Therefore, the Y-direction interval dy1 between the light emitting portions 141 and 143 is shorter than the Y-direction interval dy2 between the light emitting portions 141 and 142 and the Y-direction interval dy2 between the light emitting portions 142 and 143 . A distance dx in the X direction between the light emitting portions 141 and 143 and the light emitting portion 142 is longer than the distances dy1 and dy2.

The diffusing element 131 corresponds to the two light emitting parts 141 and 143 . A diffusion element 132 corresponds to one light emitting section 142 . That is, the blue light emitted from each of the light emitting units 141 and 143 through the common condensing optical system 120 is diffused by the diffusion element 131 at the position PS2. The blue light emitted from the light emitting section 142 through the common condensing optical system 120 is diffused by the diffusing element 132 at the position PS2.

Each of the diffusion elements 131 and 132 has a long side Lc and a short side Ld, and is formed in a rectangular shape. However, the long side Lc of the diffusion element (first diffusion element) 131 is parallel to the Y direction, and the short side Ld of the diffusion element 131 is parallel to the X direction. The diffusion element 131 is formed in a rectangular shape that is longer in the Y direction than in the X direction. On the other hand, the long side Lc of the diffusion element (second diffusion element) 132 is parallel to the X direction, and the short side Ld of the diffusion element 132 is parallel to the Y direction. The diffusion element 132 is formed in a rectangular shape that is longer in the X direction than in the Y direction. The long side Lc of the diffusing element 132 is substantially equal to the short side Ld of the diffusing element 131 .

The size of the diffusing element 131 actually arranged at the position PS2 in the XY plane is moderately larger than the area including the beam area of the blue light that reaches the position PS2 after being emitted from each of the light emitting units 141 and 143. big. The size in the XY plane of the diffusion element 132 actually arranged at the position PS2 is moderately larger than the area including the beam area of the blue light reaching the position PS2 after being emitted from each of the light emitting units 142.

The optical axis AX100 passes through an intermediate position between the light emitting units 141 and 143 and 142 in the X direction, an intermediate position between the light emitting units 141 and 143 in the Y direction, and overlaps the center of the light emitting unit 142 in the Y direction.

According to the light source device of the ninth embodiment described above, the blue light emitted from each of the three light emitting units 141 to 143 spaced apart from each other on the XY plane is diffused into the two diffusers formed separately from each other. Efficient diffusion can be achieved by the elements 131 and 132 .

Further, in the light source device of the ninth embodiment, the plurality of light emitting units 140 includes a light emitting unit 141 that emits blue light LB1, a light emitting unit 142 that emits blue light LB2, and blue light (third light (not shown)). ) includes a light emitting portion 143 for emitting LB3. As can be seen from FIGS. 2 and 12, the blue light LB3 emitted from the light emitting section 143 enters the condensing optical system 120 while being separated from the blue lights LB1 and LB2 on the XY plane. The intervals dy1 and dy2 between the light-emitting portion 143 and the light-emitting portions 141 and 142 are shorter than the interval dx between the light-emitting portions 141 and 142 . In the light source device of the ninth embodiment, the blue light LB3 emitted from the condensing optical system 120 is diffused by the diffusing element 131. FIG. According to the light source device of the ninth embodiment, the diffusion elements 131, 132 are arranged apart from each other, it is possible to easily install each of the diffusion elements 131 and 132 while suppressing deterioration in the diffusion accuracy of the diffusion elements 131 and 132, and damage to the plurality of diffusion elements 131 and 132 and Damage can be prevented.

Further, in the light source device of the ninth embodiment, the plurality of light emitting units 140 includes a light emitting unit 143 that emits blue light (fourth light) LB3. The light emitting section 143 is arranged on the -Y side of the light emitting sections 141 and 142 in the Y direction (first direction). Also, the light emitting portion 142 is shifted in either the X direction (second direction) or the Y direction with respect to the light emitting portions 141 and 143 . In the light source device of the ninth embodiment, the light emitting portion 140 is shifted from both the light emitting portions 141 and 143 in the Y direction parallel to the short side Lb of the light emitting portion 141 and the X direction parallel to the long side La. 142 corresponds to a diffusion element 132 formed separately from the diffusion element 131 corresponding to the light emitting portions 141 and 143 . According to the light source device of the ninth embodiment, each of the diffusion elements 131 and 132 is miniaturized compared to one diffusion element that commonly diffuses the light emitted from the light emitting portions 141 to 143 as in the conventional art. be able to. Further, by considering the relative arrangement and deviation in the X direction and the Y direction of the light emitting parts 141 to 143 as described above, the effect of downsizing each of the diffusing elements 131 and 132 is enhanced.

Further, in the light source device of the ninth embodiment, the plurality of diffusion elements 130 are rectangular diffusion elements (fifth diffusion elements) having long sides (first long sides) Lc and short sides (first short sides) Ld ) 131. The plurality of light emitters 140 includes light emitters 141 and 142 corresponding to the diffusion element 131 . A plurality of LDs 180 are arranged one-dimensionally along the X direction in each of the light emitting units 141 and 142 . The light emitting units 141 and 142 have a long side (second long side) La extending in the X direction (arrangement direction) in which the plurality of LDs 180 are arranged and a short side La extending in the Y direction (direction perpendicular to the arrangement direction). It is formed in a rectangular shape having a side (second short side) Lb. As shown in FIG. 12, the direction in which the long side Lc of the diffusing element 131 extends coincides with the direction in which the short sides Lb of the light emitting portions 141 and 142 extend, which is the Y direction. According to the light source device of the ninth embodiment, the short side Lb of each of the light emitting sections 141 and 143 is parallel to the Y direction parallel to the long side Lc of the diffusion element 131, so that the two light emitting sections 141 and 143 blue light beams LB1 and LB3 emitted from each can be made incident on a common diffusion element 131 .

In addition, in the light source device of the ninth embodiment, the diffusion element 131 corresponds to the two light emitting sections 141 and 143, but the diffusion element 131 may correspond to three or more light emitting sections 140. FIG. Also, although the diffusion element 132 corresponds to one light emitting section 142 , the diffusion element 132 may correspond to two or more light emitting sections 140 . Although not shown, for example, a light-emitting unit 140 different from the light-emitting unit 142 is arranged on the +Y side or the −Y side of the light-emitting unit 142 on the surface 114a of the substrate 114, and the diffusion element 132 is newly combined with the light-emitting unit 142. It may correspond to the arranged light emitting unit 140 . Further, a substrate 118 different from the substrate 114 is arranged on the +Y side or the −Y side of the substrate 114, and a light emitting portion 140 different from the light emitting portion 142 is arranged on the surface of the newly arranged substrate 118 on the +Z side. , and the diffusion element 132 may correspond to the light emitting portion 142 and the newly arranged light emitting portion 140 .

Further, according to the projector of the ninth embodiment, by including the above-described light source device, it is possible to secure the amount of white light WL emitted from the light source device and suppress the decrease in the brightness of the image on the screen SCR. can.

[Tenth embodiment]
Next, a tenth embodiment of the present invention will be described with reference to FIGS. 13 to 16. FIG.
13 and 14 are plan views of the white light generator 100B of the tenth embodiment. The white light generator 100B can be installed in place of the white light generator 100A of the projector 5 shown in FIG. As shown in FIGS. 13 and 14, the white light generation unit 100B includes a light emitting device 110B, a prism mirror 170, a condensing optical system 120, a plurality of diffusion elements 130, an angle adjustment mechanism 190, and a rotating fluorescent plate 40. and a pickup optical system 60 .

The light emitting device 110B includes six light emitting portions 141 to 146 as the plurality of light emitting portions 140, four substrates 113 to 116 as the plurality of substrates 118, and two diffusion elements 131 and 132 as the plurality of diffusion elements 130. Prepare.

FIG. 15 is a schematic diagram showing correspondence relationships between the light emitting units 141 to 146, the plurality of diffusion elements 131 and 132, and the plurality of substrates 113 to 116 of the light source device according to the tenth embodiment. As shown in FIGS. 13 to 15, in the light emitting device 110B in the white light generation section 100B of the light source device of the tenth embodiment, the plurality of substrates 118 and the plurality of substrates 118 of the light source device of the modification of the fourth embodiment shown in FIG. , two light emitting portions 141 and 142 are formed on the surface 113a of the substrate 113, and one light emitting portion 143 is formed on the surface 114a of the substrate 114. As shown in FIG. For example, three LDs 180 are one-dimensionally arranged along the Y direction in each of the plurality of light emitting units 141 to 146 .

The light emitting portion 141 is arranged near the center of the surface 113a in the X direction and on the −X side of the center in the X direction, and is arranged at the end of the surface 113a on the −Y side. The light emitting part 142 is arranged near the center of the surface 113a in the X direction and on the +X side of the center in the X direction, and is arranged at the end of the surface 113a on the -Y side. The light emitting portion 143 is arranged at the center of the surface 114a in the X direction, and is arranged at the end of the surface 114a on the -Y side.

Two light emitting portions 144 and 145 are formed on surface 115 a of substrate 115 , and one light emitting portion 146 is formed on surface 116 a of substrate 116 . The light emitting portion 144 is arranged near the center of the surface 115a in the X direction and on the −X side of the center in the X direction, and is arranged at the end of the surface 115a on the +Y side. The light emitting unit 145 is arranged near the center of the surface 115a in the X direction and on the +X side of the center in the X direction, and is arranged at the end of the surface 115a on the +Y side. The light emitting unit 146 is arranged at the center of the surface 116a in the X direction, and is arranged at the +Y side end of the surface 116a.

As shown in FIG. 15, the two substrates 113 and 114 and the two substrates 115 and 116 are aligned with each other in the X direction. The two substrates 113 and 115 and the two substrates 114 and 116 are respectively aligned with each other in the Y direction. The distance between the substrates 113 and 115 and the substrates 114 and 116 in the X direction is substantially the same as the distance between the substrates 113 and 114 and the substrates 115 and 116 in the Y direction. Also, the two light-emitting portions 141 and 142 and the light-emitting portion 143 indicated by the solid line are aligned with each other in the Y direction. The two light emitting portions 144, 145 and the light emitting portion 146 indicated by solid lines are aligned with each other in the Y direction. In the following description, the light emitting units 143 and 146 indicated by solid lines in FIG. 15 are simply referred to as light emitting units 143 and 146. Light-emitting units 143 and 146 indicated by dashed lines in FIG. 15 will be described later. The two light-emitting portions 141 and 144, the two light-emitting portions 142 and 145, and the two light-emitting portions 143 and 146 are arranged aligned with each other in the X direction.

The distance dx1 in the X direction between the light emitting portions 141 and 144 and the light emitting portions 142 and 145 is shorter than the distance dx2 in the X direction between the light emitting portions 142 and 145 and the light emitting portions 143 and 146 . A distance dy in the Y direction between the light emitting portions 141 to 143 and the light emitting portions 144 to 146 is longer than the distance dx1 and shorter than the distance dx2.

As shown in FIGS. 13 and 14, the prism mirror 170 is arranged between the light emitting device 110B and the condensing optics 120 in the Z direction. The prism mirror 170 is formed in a plate shape and has surfaces 170 a and 170 b, end faces 170 c and 170 d, and reflecting surfaces 171 and 172 . The prism mirror 170 is made of a material that can transmit blue lights LB3 and LB6 emitted from at least the light emitting sections 143 and 146 of the plurality of light emitting sections 140 .

The surface 170a constitutes the -Z side plate surface of the prism mirror 170. As shown in FIG. The surface 170b constitutes the plate surface on the +Z side of the prism mirror 170 and is shifted to the -X side with respect to the surface 170a. Each of the surfaces 170a, 170b is formed in a rectangular shape when viewed along the Z direction. The end surface 170c constitutes the plate surface of the prism mirror 170 on the +Y side. The end surface 170d constitutes the -Y side plate surface of the prism mirror 170. As shown in FIG. Each of the end faces 170c and 170d is formed in a parallelogram shape when viewed along the Y direction.

The reflecting surface 171 constitutes the +X side plate surface of the prism mirror 170, connects the +X side ends of the surfaces 170a and 170b, and connects the +X side ends of the end surfaces 170c and 170d. The reflecting surface 172 constitutes the −X side plate surface of the prism mirror 170, connects the −X side ends of the surfaces 170a and 170b, and connects the −X side ends of the end surfaces 170c and 170d. Link. The reflecting surfaces 171 and 172 move from the +X side to the -X side as they move from the -Z side to the +Z side, are inclined with respect to the X direction and the Z direction when viewed from the Y direction, and and form an angle of approximately 45°. Each of the reflecting surfaces 171 and 172 is formed in a rectangular shape that is longer in the Y direction than in the Z direction when viewed along the X direction.

Specifically, the reflective surfaces 171 and 172 are made of a material capable of transmitting the blue lights LB3 and LB6 as described above, and are formed in a plate-like shape. , or a metal material capable of reflecting the blue lights LB3 and LB6 is sprayed onto the surfaces corresponding to the reflecting surfaces 171 and 172 to form the reflecting films (not shown). It is The reflective surface 171 overlaps the light emitting portions 143 and 146 in the X direction. The reflecting surface 172 is arranged on the +X side of the light emitting section 142 in the X direction by a distance substantially equal to the separation distance between the light emitting sections 142 and 143 .

The optical axis AX100 overlaps the centers of the light emitting units 142 and 145 in the X direction and passes through intermediate positions between the light emitting units 141 to 143 and the light emitting units 144 to 146 in the Y direction.

As shown in FIG. 13, blue light beams LB3 and LB6 emitted from the light emitting unit 143 travel toward the +Z side in parallel with the Z direction, enter the prism mirror 170 from the surface 170a on the +X side, and are reflected by the reflecting surface 171. be done. The blue light LB3 reflected by the reflecting surface 171 travels inside the prism mirror 170 along the X direction from the +X side to the −X side and is reflected by the reflecting surface 172 . The blue light LB3 reflected by the reflecting surface 172 travels again parallel to the Z direction toward the +Z side, and is emitted toward the +Z side from the −X side surface 170b. The blue light LB3 emitted from the light emitting unit 143 is gathered to the -X side by the prism mirror 170 before entering the condensing optical system 120, and approaches the blue light LB2 in the X direction.

The blue light LB1 emitted from the light emitting unit 141, the blue light LB2 emitted from the light emitting unit 142, and the blue light LB3 emitted from the prism mirror 170 are spaced apart from each other at substantially equal intervals in the X direction. . The blue lights LB1 and LB2 and the blue light LB3 emitted from the prism mirror 170 enter the condensing optical system 120 . The diffusing element 131 diffuses the blue lights LB1, LB2, and LB3 emitted from the condensing optical system 120, and irradiates a predetermined region of the phosphor layer 42 of the rotary phosphor plate 40 with the blue lights.

As described above, each of the light emitting portions 141 and 144 are aligned in the X direction, each of the light emitting portions 142 and 145 are aligned in the X direction, and each of the light emitting portions 143 and 146 are aligned in the X direction. aligned with each other. Therefore, each of the blue lights LB4, LB5, and LB6 emitted from the light-emitting units 144, 145, and 146 are blue lights LB1, LB2, and LB3 when viewed along the Y direction on the XZ plane including the X and Z directions. overlaps with each of

However, as shown in FIG. 14, when viewed along the X direction, the blue light LB4 emitted from the light emitting unit 144 is on the opposite side of the optical axis AX100 from the blue light LB1 in the Y direction, that is, −Y side along the Z direction. The diffusing element 132 overlaps the diffusing element 131 at a position PS2 in the Z direction, and is arranged on the side opposite to the diffusing element 131 with respect to the optical axis AX100 in the Y direction, that is, on the -Y side. That is, at the position PS2, the diffusing elements 131 and 132 are arranged side by side in the Y direction with the optical axis AX100 interposed therebetween with a space therebetween. The diffusion element 132 diffuses the blue light LB4 emitted from the condensing optical system and irradiates it onto a predetermined region of the phosphor layer 42 .

As described above, the light emitting units 141 to 143 are aligned in the Y direction, and the light emitting units 144 to 146 are aligned in the Y direction. Each of the blue lights LB5 and LB6 overlaps the blue light LB4 when viewed along the X direction on the YZ plane including the Y and Z directions. The size of the prism mirror 170 in the Y direction is the +Y side end of the beam area of the blue lights LB1 to LB3 emitted from the light emitting sections 141 to 143 and the beams of the blue lights LB4 to LB6 emitted from the light emitting sections 144 to 146. It is larger than the separation distance in the Y direction from the -Y side edge of the region.

Like the blue light LB3 emitted from the light emitting unit 143, the blue light LB6 emitted from the light emitting unit 146 travels toward the +Z side parallel to the Z direction, and enters the prism mirror 170 from the +X side surface 170a. , is reflected by the reflective surface 171 . The blue light LB6 reflected by the reflecting surface 171 travels inside the prism mirror 170 along the X direction from the +X side to the −X side, is reflected by the reflecting surface 172, and travels again to the +Z side parallel to the Z direction. Then, it is emitted to the +Z side from the surface 170b on the -X side. The blue light LB6 emitted from the light emitting unit 146 is gathered to the -X side by the prism mirror 170 before entering the condensing optical system 120, and approaches the blue light LB5 in the X direction.

The blue light LB4 emitted from the light emitting unit 144, the blue light LB5 emitted from the light emitting unit 145, and the blue light LB6 emitted from the prism mirror 170 are separated from each other at approximately equal intervals in the X direction. Incident into a common condensing optical system 120 . The diffusing element 132 diffuses the blue light LB2 and LB3 emitted from the condensing optical system 120 together with the blue light LB1 emitted from the condensing optical system 120, while diffusing the blue light LB2 and LB3 emitted from the condensing optical system 120, while diffusing the blue light LB2 and LB3 emitted from the condensing optical system 120. to irradiate.

The angle adjustment mechanism 190 includes a rotation shaft member (angle adjustment mechanism) 191 provided corresponding to the diffusion element 131 and a rotation shaft member (angle adjustment mechanism) 192 provided corresponding to the diffusion element 132 .

FIG. 16 is a schematic diagram showing how the angles of the diffusing elements 131 and 132 are adjusted by the rotating shaft members 191 and 192. As shown in FIG. Here, the optical axis of each of the blue lights LB1 to LB3 emitted from the condensing optical system 120 is defined as an optical axis AX1, and the optical axis of each of the blue lights LB4 to LB6 emitted from the condensing optical system 120 is an optical axis. AX2. The angle adjustment mechanism 190 adjusts the incident angle α1 of the blue lights LB1 to LB3 emitted from each of the light emitting units 141 to 143 and condensed by the condensing optical system 120 to the diffusion element 131, thereby adjusting the angle α1 of the light emitting units 144 to 146. , and condensed by the condensing optical system 120 to the diffusion element 132, the incident angle α2 is adjusted.

Each of the rotary shaft members 191 and 192 is a rod-shaped member having respective axes JX1 and JX2 extending along the X direction. One end of the rotating shaft member 191 is connected to the diffusion element 131 from the +X side or -X side of the diffusion element 131 . One end of the rotary shaft member 192 is connected to the diffusion element 132 from the +X side or -X side of the diffusion element 132 . The angle adjusting mechanism 190 includes a driving mechanism (not shown) that rotates each of the rotating shaft members 191 and 192 in the circumferential direction around the respective axes of the rotating shaft members 191 and 192 .

As shown in FIGS. 14 and 16, the diffusion surfaces of the diffusion elements 131 and 132 are arranged parallel to the Y direction, for example. That is, the plate-like diffusion elements 131 and 132 extend in the XY plane. When the rotating shaft member 191 rotates in the circumferential direction around the axis JX1, the diffusing element 131 and the diffusing surface rotate around the axis JX1, changing the incident angle α1. Similarly, when the rotating shaft member 192 rotates in the circumferential direction around the axis JX2, the diffusing element 132 and the diffusing surface rotate around the axis JX2, changing the incident angle α2. By adjusting the incident angles α1 and α2 independently of each other, the diffusion distribution of each of the blue lights LB1 to LB3 and LB4 to LB6 emitted from each of the diffusion elements 131 and 132 is adjusted. The shape of light incident on each optical element on the +Z side of 131 and 132 is adjusted.

As indicated by broken lines in FIG. 16, the attitudes of the diffusion elements 131 and 132 are adjusted by the rotating shaft members 191 and 192 so that the diffusion surfaces of the diffusion elements 131 and 132 are perpendicular to the optical axes AX1 and AX2. When adjusted, the angles of incidence α1 and α2 are 90°. In this state, the blue light beams LB1 to LB3 and LB4 to LB6 emitted from the condensing optical system 120 enter the diffusing elements 131 and 132 substantially perpendicularly, and are evenly distributed within the plane perpendicular to the optical axes AX1 and AX2. It is diffused and enters the phosphor layer 42 .

As described in the first embodiment, from the phosphor layer 42, a part of the incident blue light LB1 to LB6 is transmitted, and at least part of the remaining incident blue light LB1 to LB6 is generated. yellow light LY is emitted. The blue light LB transmitted through the phosphor layer 42 and the yellow light LY emitted from the phosphor layer 42 are combined with each other and emitted toward the pickup optical system 60 .

In the light-emitting device 110B, the blue lights LB3 and LB6 emitted from the light-emitting sections 143 and 146 are brought to the -X side by the prism mirror 170 before entering the condensing optical system 120, and the light-emitting sections 142 and 145 in the X direction. approaches the blue lights LB2 and LB5 emitted from the . As shown in FIG. 15, the diffusion element 131 corresponds to the light emitting units 141 and 142 and the virtual light emitting unit 143, which is the light emitting unit 143 indicated by the solid line moved to the -X side. Similarly, the diffusing element 132 corresponds to the light emitting portions 144 and 145 and the virtual light emitting portion 146, which is obtained by moving the light emitting portion 146 indicated by the solid line to the -X side as indicated by the broken line. The distance in the X direction between the light emitting portions 143 and 146 and the virtual light emitting portions 143 and 146 is the end of the reflecting surface 171 of the prism mirror 170 on the -X side and +Z side and the end of the reflecting surface 172 on the +X side and -Z side. It is approximately equal to the separation distance in the X direction from the edge.

The distance in the X direction between the light emitting units 142 and 145 and the virtual light emitting units 143 and 146 is equivalent to the distance dx1 between the light emitting units 141 and 144 and the light emitting units 142 and 145. shorter than the interval dy with 144-146. Each of diffusion elements 131 and 132 is formed in a rectangular shape that is longer in the X direction than in the Y direction. Diffusion elements 131 and 132 have the same size as each other.

According to the light source device of the tenth embodiment described above, the blue light emitted from each of the six light emitting units 141 to 146 arranged apart from each other on the XY plane is diffused into the two separately formed diffusers. Efficient diffusion can be achieved by the elements 131 and 132 .

Further, in the light source device of the tenth embodiment, the plurality of light emitting units 140 includes light emitting units (first light emitting units) 141 and 144 that emit blue light (first light) LB1 and LB4, and blue light (second light). ) In addition to light emitting units (second light emitting units) 142 and 145 for emitting LB2 and LB5, light emitting units (fourth light emitting units) 143 and 146 for emitting blue light (fourth light) LB3 and LB6 are included. The light source device of the tenth embodiment further includes a prism mirror 170 that brings the blue lights LB3 and LB6 emitted from the light emitting units 143 and 146 closer to the blue lights (one of the first light and the second light) LB2 and LB5. Prepare. The blue light LB2 and the blue light LB3 are diffused by the same diffusion element 131 as each other. Blue light LB5 and blue light LB6 are diffused by the same diffusion element 132 as each other.

According to the light source device of the tenth embodiment, the blue lights LB2 and LB5 emitted from the light emitting sections 142 and 145 and the blue lights LB3 and LB6 emitted from the light emitting sections 143 and 146 using the prism mirror 170 can be shortened. As a result, the distance dx2 in the X direction between the blue lights LB2 and LB3 incident on the condensing optical system 120 is made equal to the distance dx1 in the X direction between the blue lights LB1 and LB2. can be shorter than the interval dy in the Y direction. In addition, the X-direction interval dx1 between the blue lights LB5 and LB6 incident on the condensing optical system 120 can be made equal to the X-direction interval dx1 between the blue lights LB4 and LB5 and shorter than the interval dy.

According to the light source device of the tenth embodiment, the prism mirror 170 is used to adjust the intervals in the X direction between the blue lights LB2 and LB3 and the blue lights LB5 and LB6, so that the blue lights LB1 to LB6 are mutually aligned on the XY plane. Blue lights LB1 to LB3 having the shortest distance between adjacent blue lights can be made incident on the same diffusion element 131, and blue lights LB4 to LB6 can be made to be made incident on the same diffusion element 132 with each other. As a result, blue light LB1 to LB6 emitted from each of the light emitting units 141 to 146 is reduced to two while the number of the plurality of diffusion elements 130 is suppressed to two for the light emitting device 110B having the six light emitting units 141 to 146. It is possible to efficiently reduce the size of each of the diffusing elements 131 and 132 formed separately from each other, compared to the case of diffusing with a common diffusing element.

In the light source device of the tenth embodiment, the light emitting units 143 and 146 are arranged on the +X side of the light emitting units 142 and 145. For example, the substrates 114 and 116 and the light emitting units 143 and 146 It may be arranged on the -X side of the light emitting units 141 and 144 . In that case, the prism mirror 170 is moved from the position described above to the -X side, and the reflecting surface 171 is moved to the -X side from the light emitting section 141 in the X direction by a distance substantially equal to the separation distance between the light emitting sections 141 and 142 . , and the reflecting surface 172 may be arranged so as to overlap the light emitting portions 143 and 146 in the X direction. In this case, the optical axis AX100 overlaps the centers of the light emitting units 141 and 144 in the X direction, and passes through intermediate positions between the light emitting units 141 to 143 and the light emitting units 144 to 146 in the Y direction. In such an arrangement configuration, the prism mirror 170 is used to adjust the X-direction intervals of the blue lights LB1 and LB3 and the blue lights LB4 and LB6, and similarly to the light source device described above, one of the blue lights LB1 to LB6 is The blue lights LB1 to LB3 having the shortest distance between adjacent blue lights on the XY plane can be made incident on the same diffusion element 131, and the blue lights LB4 to LB6 can be made incident on the same diffusion element 132.

Further, the light source device of the tenth embodiment is provided corresponding to the diffusion elements 131 and 132, and diffusion elements corresponding to the blue lights LB1 to LB3 and LB4 to LB6 emitted from the light emitting sections 141 to 143 and 144 to 146. An angle adjusting mechanism 190 for adjusting incident angles α1 and α2 to 131 and 132 is further provided. According to the light source device of the tenth embodiment, the angle adjusting mechanism 190 is used to adjust the incident angles α1 and α2 of the blue light beams LB1 to LB3 and LB4 to LB6 emitted from the condensing optical system 120. , 132 can be adjusted easily and with high precision.

In the tenth embodiment, the angle adjustment mechanism 190 includes the rotating shaft members 191 and 192 corresponding to the diffusion elements 131 and 132, but the angle adjustment mechanism 190 corresponds to at least one of the diffusion elements 131 and 132. and may diffuse blue light incident on at least one of the diffusing elements. Further, the angle adjusting mechanism 190 may be provided corresponding to the diffusing element 131 or the diffusing element 132 of the light source device 50 of the first embodiment shown in FIGS. It may be provided corresponding to at least one of the diffusing elements 130 . As a result, the intensity distribution and shape of light incident on each optical element of the projector 5 arranged on the +Z side of at least one diffusion element 130 can be adjusted.

Further, in the tenth embodiment, the angle adjusting mechanism 190 is not limited to the rotating shaft members 191 and 192 and the driving mechanism for rotating these shaft members in the circumferential direction about the axes JX1 and JX2. broadly includes those configured to be able to adjust the incident angle to the diffusing element 130 . For example, the angle adjustment mechanism 190 includes a frame that maintains the relative positions of the diffusion elements 131 and 132 and holds these diffusion elements, and a rotation mechanism that rotates the frame about a rotation axis parallel to the X direction. and may be provided.

In the light source device of the tenth embodiment, the long side Lc of the diffusion element 131 extends in the short side Lb of each of the light emitting sections 141 and 142 and the short side Lb of the virtual light emitting section 143. , which is the X direction. The direction in which the long side Lc of the diffusion element 132 extends coincides with the direction in which the short side Lb of each of the light emitting portions 144 and 145 and the short side Lb of the virtual light emitting portion 146 extends, and is the Y direction. According to the light source device of the tenth embodiment, the short sides Lb of the light emitting sections 141 and 142 and the imaginary light emitting section 143 are parallel to the direction parallel to the long side Lc of the diffusion element 131. Blue light beams LB1 to LB3 emitted from the two light emitting portions 141 to 143 can be made incident on the common diffusion element 131. FIG. Similarly, since the short sides Lb of the light emitting sections 144, 145 and the virtual light emitting section 146 are parallel to the direction parallel to the long side Lc of the diffusing element 132, light is emitted from the three light emitting sections 144 to 146. The emitted blue light LB 4 -LB 6 can be incident on a common diffusion element 132 .

Further, according to the projector of the tenth embodiment, by providing the above-described light source device, it is possible to ensure the amount of white light WL emitted from the light source device, and to suppress a decrease in the brightness of the image on the screen SCR. can.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the scope of the claims. Transformation and change are possible. In addition, the constituent elements of multiple embodiments can be combined as appropriate. For each of the above-described embodiments, noteworthy actions and effects have been described, but even without detailed explanations, actions and effects of other embodiments to which the configuration of the light source device applies can be obtained.

In each embodiment, the number of light emitting units and the number of diffusing elements are individually exemplified, but in the light source device of the present invention, these numbers are not limited to a specific number of 2 or more. In the light source device of the present invention, even if the arrangement of the plurality of light emitting portions on one or more substrates is restricted to some extent, the distance between the light emitting portions adjacent to each other among the plurality of light emitting portions is considered. The total number of diffusing elements can be suppressed while miniaturizing the diffusing elements. As described above, the size of each diffusing element is preferably set according to the manufacturing equipment and manufacturing conditions so that the size of each diffusing surface satisfies desired fabrication accuracy and yield. It is preferable to ensure a longer interval between the plurality of diffusing elements. In addition, it is preferable to make one diffusion element correspond to more light emitting portions. By appropriately setting in this way, deterioration of the diffusion characteristics of the plurality of diffusion elements can be suppressed, the plurality of diffusion elements can be easily installed in a limited installation space, and damage or breakage of the plurality of diffusion elements can be prevented. can be prevented.

Further, a known configuration may be added to the projector of each of the above-described embodiments of the light source device, or the configuration may be changed to a known configuration. For example, with regard to the light source device 50 of the projector 5 shown in FIGS. 1 and 2, a so-called transmissive rotating fluorescent plate is exemplified. However, in the light source device of the present invention, a reflective rotating fluorescent plate or a reflective fluorescence generating section may be used instead of the transmissive rotating fluorescent plate. In the reflective rotating fluorescent plate, the above-described fluorescent layer 42 is arranged, for example, in a predetermined area in the radial direction of the -Z side surface of the disc 41 . The disk 41 functions as a reflector that reflects the yellow light LY traveling from the phosphor layer 42 toward the disk 41 side.

Further, in the light source device of the present invention, in the configuration described with reference to FIGS. It may be used as blue light for generating WL. In that case, yellow light separately generated using the phosphor layer, red light emitted from a light source emitting red light, and green light emitted from a light source emitting green light are emitted from the condensing optical system 120. white light WL is generated. For example, by arranging a dichroic mirror or the like on the +Z side course of the blue light emitted from the condensing optical system 120, blue light and yellow light or red light and green light are synthesized as described above. .

A light source device according to an aspect of the present invention may have the following configuration.
A light source device according to one aspect of the present invention includes a plurality of light emitting units including a first light emitting unit that emits first light and a second light emitting unit that emits second light, and from each of the plurality of light emitting units A condensing optical system in which a plurality of emitted lights are incident and condensed on an optical element while the plurality of lights are spaced apart from each other; and a first diffusion element that diffuses at least the first light emitted from the condensing optical system. and a second diffusion element that diffuses at least the second light that is separated from the first light emitted from the condensing optical system.

In one aspect of the light source device of the present invention, the plurality of light emitting units may include a third light emitting unit that emits third light. The third light emitted from the third light emitting unit enters the condensing optical system in a state separated from at least the first light or the second light, and the third light emitting unit and the first light emitting unit or the second light emitting unit The distance may be shorter than the distance between the first light emitting part and the second light emitting part, and the third light emitted from the condensing optical system may be diffused by the first diffusion element or the second diffusion element.

In one aspect of the light source device of the present invention, the plurality of light emitting units may include a fourth light emitting unit that emits fourth light. The fourth light emitting part is arranged in the first direction with respect to the first light emitting part or the second light emitting part, and the second light emitting part is arranged in the first direction and the first direction with respect to the first light emitting part and the fourth light emitting part may deviate in any direction from the second direction orthogonal to .

In one aspect of the light source device of the present invention, the plurality of light-emitting portions includes a first group in which two or more light-emitting portions are arranged in a line at regular intervals in a third direction and a fourth direction orthogonal to the third direction. may contain. The plurality of diffusing elements includes a third diffusing element and a fourth diffusing element corresponding to the light emitting units of the first group, and the third diffusing element and the fourth diffusing element are arranged in a third direction or a fourth direction with respect to the first group. They may be arranged side by side.

In one aspect of the light source device of the present invention, the plurality of diffusing elements may include a fifth rectangular diffusing element having a first long side and a first short side. The plurality of light emitting units includes a fifth light emitting unit corresponding to the fifth diffusion element, the fifth light emitting unit has a one-dimensional arrangement of the plurality of semiconductor lasers, and the fifth light emitting unit has an array of the plurality of semiconductor lasers. and a second short side extending in a direction perpendicular to the arrangement direction. and the direction of the movement may coincide with each other.

A light source device according to one aspect of the present invention may include a plurality of substrates on which a plurality of light emitting portions are formed.

In the light source device according to one aspect of the present invention, the light emitting portion is arranged at the end portion of the adjacent substrate on each substrate, and the light emitted from each of the plurality of light emitting portions arranged on the adjacent substrates. may be diffused by the same diffusing element as each other.

In the light source device according to one aspect of the present invention, the plurality of diffusing elements are arranged apart from each other between the light emitting portions having the longest interval between the adjacent light emitting portions among the plurality of light emitting portions, and may have the same size.

In the light source device according to one aspect of the present invention, the plurality of diffusing elements are arranged apart from each other between the light emitting portions having the longest interval between the adjacent light emitting portions among the plurality of light emitting portions. Among the diffusing elements, a diffusing element having a smaller number of light-emitting portions that emit incident blue light may be smaller than the other diffusing elements.

In one aspect of the light source device of the present invention, the plurality of light emitting units further includes a fourth light emitting unit that emits fourth light, and the fourth light emitted from the fourth light emitting unit is the first light and the second light. A prism mirror may be further provided to bring one of the lights closer, and the first light or the second light and the fourth light may be diffused by the same diffusing element.

In the light source device according to one aspect of the present invention, the incident angle to the diffusion element corresponding to the light emitted from the first light emitting section or the second light emitting section provided corresponding to the first diffusion element or the second diffusion element You may further have an angle adjustment mechanism which adjusts.

A projector according to one aspect of the present invention may have the following configuration.
A projector according to one aspect of the present invention includes the light source device described above, a light modulation device that modulates light from the light source device according to image information to form image light, and a projection optical system that projects the image light. , provided.

5 Projector 42 Phosphor layer (optical element) 50 Light source device 120 Condensing optical system 130 Diffusion element 131 Diffusion element (first diffusion element) 132 Diffusion element (second diffusion element), 140... light-emitting part, 141... light-emitting part (first light-emitting part), 142... light-emitting part (second light-emitting part), LB1... blue light (first light), LB2... blue light (second light).

Claims (12)

a plurality of light emitting units including a first light emitting unit that emits a first light and a second light emitting unit that emits a second light;
a condensing optical system that receives a plurality of lights emitted from each of the plurality of light emitting units and converges the plurality of lights on an optical element while the plurality of lights are separated from each other;
A first diffusion element for diffusing at least the first light emitted from the condensing optical system and a second diffusion element for diffusing at least the second light separated from the first light emitted from the condensing optical system a plurality of diffusing elements including a diffusing element;
comprising
Light source device. the plurality of light emitting units include a third light emitting unit that emits a third light,
the third light emitted from the third light emitting unit enters the condensing optical system in a state separated from at least the first light or the second light;
the distance between the third light emitting unit and the first light emitting unit or the second light emitting unit is shorter than the distance between the first light emitting unit and the second light emitting unit;
the third light emitted from the condensing optical system is diffused by the first diffusion element or the second diffusion element;
The light source device according to claim 1. the plurality of light emitting units include a fourth light emitting unit that emits a fourth light;
The fourth light emitting unit is arranged in a first direction with respect to the first light emitting unit or the second light emitting unit,
The second light emitting unit is shifted from the first light emitting unit and the fourth light emitting unit in either the first direction or a second direction orthogonal to the first direction,
The light source device according to claim 1 or 2. The plurality of light emitting units includes a first group in which two or more light emitting units are arranged at equal intervals in a third direction and a fourth direction orthogonal to the third direction,
the plurality of diffusing elements includes a third diffusing element and a fourth diffusing element corresponding to the first group of light emitting units;
The third diffusion element and the fourth diffusion element are arranged side by side in the third direction or the fourth direction with respect to the first group,
The light source device according to any one of claims 1 to 3. the plurality of diffusing elements includes a fifth rectangular diffusing element having a first long side and a first short side;
the plurality of light emitting units includes a fifth light emitting unit corresponding to the fifth diffusion element;
A plurality of semiconductor lasers are arranged one-dimensionally in the fifth light emitting unit,
The fifth light emitting section is formed in a rectangular shape having a second long side extending in the arrangement direction of the plurality of semiconductor lasers and a second short side extending in a direction orthogonal to the arrangement direction. ,
the direction in which the first long side extends and the direction in which the second short side extends are aligned with each other;
The light source device according to any one of claims 1 to 4. comprising a plurality of substrates on which the plurality of light emitting units are formed,
The light source device according to any one of claims 1 to 5. the light-emitting portion of each of the substrates is arranged at the end of another adjacent substrate;
Light emitted from each of the plurality of light emitting units arranged on the substrates adjacent to each other is diffused by the same diffusion element.
The light source device according to claim 6. The plurality of diffusing elements are spaced apart from each other among the plurality of light emitting portions, and have the same size, between the light emitting portions having the longest distance between adjacent light emitting portions.
The light source device according to claim 6 or 7. the plurality of diffusing elements are spaced apart from each other among the plurality of light emitting portions, and are spaced apart between the light emitting portions having the longest distance between adjacent light emitting portions;
Among the plurality of diffusing elements, the diffusing element having a smaller number of the light emitting units that emit incident blue light is smaller than the other diffusing elements,
The light source device according to claim 6 or 7. The plurality of light emitting units further includes a fourth light emitting unit that emits a fourth light,
further comprising a prism mirror that brings the fourth light emitted from the fourth light emitting unit closer to one of the first light and the second light,
the first light or the second light and the fourth light are diffused by the same diffusion element;
The light source device according to any one of claims 1 to 7. Further comprising an angle adjustment mechanism provided corresponding to the first diffusion element or the second diffusion element for adjusting an incident angle to the diffusion element corresponding to the light emitted from the first light emitting unit or the second light emitting unit ,
The light source device according to any one of claims 1 to 10. a light source device according to any one of claims 1 to 11;
a light modulating device that forms image light by modulating light from the light source device according to image information;
a projection optical system that projects the image light;
comprising
projector.

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